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A Review of Current Knowledge with Geomechanical Fault Reactivation Modelling: The Importance of CO2 Mechano-Chemical Effects for CO2 Sequestration 地质力学断层再激活模型的最新进展:CO2力学-化学效应对CO2封存的重要性
Pub Date : 2018-10-19 DOI: 10.2118/192024-MS
I. Altaf, B. Towler, J. Underschultz, S. Hurter, Raymond L. Johnson
A fault stability study constitutes a fundamental element of any subsurface injection project that involves faults within a storage complex, yet the transient geomechanical effects introduced due to CO2-rock chemical interactions are rarely considered. This paper presents a review of the published work investigating the potential alteration of rock properties due to short to long term CO2-host rock chemical interactions during commercial scale carbon capture and storage (CCS) operations. Furthermore, the authors of this paper are attempting to highlight the potential significance of these mechanical-chemical effect on the fault reactivation potential for a commercial scale carbon capture and storage (CCS) operation. The reactive nature between CO2 dissolved in formation water and the storage reservoir can significantly alter the hydraulic and mechanical properties of the host rock, which could in turn affect the storage potential of the target reservoir. Alteration of the host rock mineralogy due to chemical interactions with CO2 have been well studied (Farquhar et al. 2015), but little is available in the published literature on the resulting changes in rock elastic properties (i.e. Young's modulus and Poisson's ratio) due to these reactions. Some recent experimental studies have suggested significant changes in rock properties occur. When we incorporated the geomechanical effects, induced by the rock elastic property changes documented in these published cases, into both 1D analytical and 3D numerical models based fault stability analyses for a Surat Basin reservoir, we observed significant modification of the reservoir storage capacity prior to reaching fault reactivation criteria. Based on our review of the published literature and our fault stability analyses, we conclude that the chemical effects of CO2 interaction with host rock needs to be experimentally tested to confirm if these effects are significant. If yes, then these effects should constitute an integral part of the geomechanical study for any large scale CO2 injection exercise if there is a critically stressed fault as part of the storage complex.
断层稳定性研究是任何涉及储层断层的地下注入项目的基本要素,但由于二氧化碳-岩石化学相互作用而引入的瞬态地质力学效应很少被考虑。本文综述了在商业规模的碳捕集与封存(CCS)过程中,由于短期到长期的二氧化碳宿主岩石化学相互作用,岩石性质可能发生变化的研究成果。此外,本文的作者试图强调这些机械-化学效应对商业规模碳捕集与封存(CCS)操作的断层再激活潜力的潜在意义。溶解在地层水中的CO2与储层之间的反应性质会显著改变储层岩石的水力和力学性质,进而影响目标储层的储集潜力。由于与二氧化碳的化学相互作用,宿主岩石矿物学的变化已经得到了很好的研究(Farquhar et al. 2015),但在已发表的文献中,由于这些反应导致的岩石弹性特性(即杨氏模量和泊松比)的变化很少。最近的一些实验研究表明,岩石性质发生了重大变化。当我们将这些已发表案例中记录的岩石弹性特性变化所引起的地质力学效应纳入基于苏拉特盆地油藏断层稳定性分析的一维解析和三维数值模型时,我们观察到在达到断层再激活标准之前,油藏存储能力发生了显著变化。根据我们对已发表文献的回顾和断层稳定性分析,我们得出结论,二氧化碳与宿主岩石相互作用的化学效应需要进行实验测试,以确认这些效应是否显著。如果是,那么这些影响应该构成地质力学研究的一个组成部分,用于任何大规模的二氧化碳注入作业,如果有一个临界应力断层作为储层的一部分。
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引用次数: 0
Well Delivery Task Force Team Approach to Increase Operation Efficiency 油井交付任务小组方法提高作业效率
Pub Date : 2018-10-19 DOI: 10.2118/192138-MS
H. Shuber, Ahmad Al-Awadi, D. Belal, Saif Al-Hashmi, Vinayak Verma, Tareq AI-Sarraf, A. Najaf, Bader Al-Telaihi, Abdulla Al-Sumaiti
With the Oil business expanding day by day and with the demand for oil increasing many challenges were introduced, Kuwait Oil Company's South-East Asset (SEK) played a major role in tackling those challenges to meet Kuwait Petroleum Company production targets. In order to ensure operational excellence strategy is implemented, multidisciplinary teams founded (Well Delivery Task Force Team) to ensure the optimization of production and the full utilization of resources available in order to heed for the KPC requirements. Today Well Delivery TFT has grown to become a symbol of defining success criteria, which goes beyond technology implementation and setting the right framework for efficiency, coordination & commitment by ensuring an effective synergy between different teams of SEK directorate. Before the Task Force was formed the teams encountered several barriers to centralization plans. Challenges like inter-dependencies, miscommunications, understanding size, time and type of operation workflows, materials availability created strong barriers to an effective plan implementation. This lead to substandard work outcome due to conveying message between one parts of the team to multiple teams located in different locations resulting in time and effort waste and eventually deviate from the desired application. As SEK core business is to meet expected oil targets, it is critical to ensure that the company standards or work practices are preserved and applied irrespective of the challenges.
随着石油业务的日益扩大和石油需求的增加,科威特石油公司的东南资产(SEK)在应对这些挑战以实现科威特石油公司的生产目标方面发挥了重要作用。为了确保卓越运营战略的实施,多学科团队(井交付工作组)成立,以确保优化生产和充分利用可用资源,以满足KPC的要求。今天,Well Delivery TFT已经发展成为定义成功标准的象征,它超越了技术实施,并通过确保SEK董事会不同团队之间的有效协同作用,为效率、协调和承诺设定了正确的框架。在工作队成立之前,各小组在集中计划方面遇到了几个障碍。诸如相互依赖、沟通不畅、理解规模、操作工作流的时间和类型、材料可用性等挑战,都是有效实施计划的强大障碍。这将导致不合格的工作结果,因为在团队的一个部分之间传递消息到位于不同位置的多个团队,从而导致时间和精力的浪费,并最终偏离期望的应用程序。由于SEK的核心业务是实现预期的石油目标,因此无论面临何种挑战,都必须确保公司标准或工作实践得以保留和应用。
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引用次数: 0
From Preservation to Execution: Value Creation through Successful FDP Optimisation for an Offshore Green Field Gas in Peninsular Malaysia 从保存到执行:通过成功的FDP优化为马来西亚半岛海上绿色气田创造价值
Pub Date : 2018-10-19 DOI: 10.2118/191930-MS
Ali Sabzabadi, Aida Binti Daeng, N. Hamza
Value Creation can be achieved through FDP optimisation initiative for offshore fields that have been impacted by recent slump in activities and investments in the Oil and Gas industry. Each stage of the FDP process can be reviewed and respective value and cost target be revised. It is to ensure that process for the opportunity still carry business value, and aligned with business objectives at current industry outlook. Alongside the opportunity maturation process, there should also be emphasis on value assurance to maximise value and chance of success. Offshore development of a green field gas development in Peninsular Malaysia was a successful story of Integration and engagement of various functions and disciplines throughout the FDP optimisation efforts, by keeping the FDP stages as "live" cycles. It let the optimisation process to encompass all activity spectrum from subsurface to surface, and warranted the project to be fully assessed from uncertainties and risk management to optimising the value of the project. Early determination and understanding of the objectives and area of focus for maximum impact on value creation initiatives were chosen to be the road map. Moreover, collaboration between the teams to revise drilling, completion and the depletion strategies with capital cost phasing were identified to be key areas for a successful development and cost optimisation of the project. Drilling and completion strategies for the wells selected in a manner that they focused on most productive zones at the beginning, with development of the shallower reservoirs by workover and intervention activities upon depletion and pressure equalisation with the lower zones. The strategy also led the capital cost to be classified as operational as future expense without compromising the reserve to be developed. The result of the work led to a significant cost saving which in turn allowed execution of the project from preservation to drilling stage in almost 6 months. This paper will highlight the initiatives and activities that made the project to be successfully move from preservation to execution mode.
对于近期受到油气行业活动和投资下滑影响的海上油田,FDP优化计划可以实现价值创造。FDP过程的每个阶段都可以进行检讨,并修订各自的价值和成本目标。这是为了确保机会的流程仍然具有业务价值,并与当前行业前景的业务目标保持一致。在机会成熟的过程中,还应该强调价值保证,以最大化价值和成功的机会。马来西亚半岛绿色气田的海上开发是一个成功的案例,通过将FDP阶段作为“活”周期,在FDP优化过程中整合和参与了各种功能和学科。它使优化过程涵盖了从地下到地面的所有活动范围,并保证了项目从不确定性和风险管理到优化项目价值的全面评估。早期确定和理解对价值创造计划产生最大影响的目标和重点领域被选为路线图。此外,团队之间的合作,根据资本成本阶段修改钻井、完井和枯竭策略,被认为是项目成功开发和成本优化的关键领域。钻井和完井策略的选择在一开始就将重点放在最高产的区域,通过修井和干预活动来开发较浅的油藏,并在较低的区域进行枯竭和压力均衡。该策略还导致资本成本被归类为运营费用,作为未来费用,而不影响待开发的储量。这项工作的结果大大节省了成本,从而使项目从保存到钻井阶段的执行时间缩短了近6个月。本文将重点介绍使项目成功地从保存模式转移到执行模式的主动性和活动。
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引用次数: 0
An Experimental Study of a Novel Parallel Pipe Separator Design for Subsea Oil-Water Bulk Separation 海底油水散装分离新型并联管式分离器设计试验研究
Pub Date : 2018-10-19 DOI: 10.2118/191898-MS
H. S. Skjefstad, M. Stanko
As oil fields mature, the produced water content of the production stream will often increase over time, and produced water management will eventually become a bottleneck in production. Subsea separation of produced water enables prolonged lifetime of brown field installations, increased recovery rates and more energy efficient production. In addition, implementation of subsea water separation will also enable future tie-ins to existing facilities, and reduce the need for new and expensive transport lines. Existing installed subsea produced water bulk separator technologies are limited to gravity and compact gravity vessels, such as Troll and Tordis, and the Marlim pipe separator. These are large installations, which are costly to manufacture, transport and install. In addition, the gravity and compact gravity vessels are not suited for deep-water installations, and there is a need for novel solutions to both reduce the weight and size of bulk water separators, making the technology more attractive for new business cases. In order to investigate improved subsea bulk water separation technologies, a multiphase oil-water test loop has been developed at the Norwegian University of Science and Technology (NTNU). Facility test fluids are ExxsolD60 and distilled water with wt%3.4 NaCl. In this paper, a new separator design, utilizing multiple parallel pipes will be presented. The design allows reduction of required wall thickness at large water depths, shorter residence times and hence a shorter separator length compared to traditional gravity based technologies. Initial performance data of a constructed medium scale prototype will be reported, including separation efficiency estimations over a range of flow rates, water cuts (WC) and water extraction rates (ER). Tested flow rates vary from 250L/min to 750L/min at 30%, 50% and 70% WC. Water extraction rates are varied from 50% to 100% of the inlet water rate. Based on this initial test campaign, the concept proves promising, displaying good separation efficiencies (>98%) for both water continuous and oil continuous inlet flows at moderate flow velocities. At higher flow rates, performance decreases, and water extraction rates must be limited in order to maintain high efficiencies. Photos of flow conditions at the water outlet are included, providing a visualization of the occurring two-phase flow phenomena inside the separator. The presented concept adds to an expanding portfolio of proposed subsea separation solutions, and displays a new way of utilizing parallel pipes to achieve oil-water bulk separation.
随着油田的成熟,生产流的采出水含量往往会随着时间的推移而增加,采出水管理最终将成为生产的瓶颈。采出水的海底分离可以延长棕地装置的使用寿命,提高采收率,提高能源效率。此外,海底水分离的实施还将使未来与现有设施的连接成为可能,并减少对昂贵的新运输线路的需求。现有的海底采出水散装分离器技术仅限于重力和紧凑型重力容器,如Troll和Tordis,以及Marlim管道分离器。这些都是大型装置,制造、运输和安装成本很高。此外,重力式和紧凑型重力船不适合深水安装,因此需要新颖的解决方案来减轻散装水分离器的重量和尺寸,从而使该技术对新的商业案例更具吸引力。为了研究改进的海底散水分离技术,挪威科技大学(NTNU)开发了一种多相油水测试回路。设备测试流体为ExxsolD60和wt%3.4 NaCl的蒸馏水。本文提出了一种利用多个平行管道的新型分离器设计方案。与传统的重力技术相比,该设计可以减少大水深下所需的壁厚,缩短停留时间,从而缩短分离器长度。将报告构建的中等规模原型的初始性能数据,包括在一定流量范围内的分离效率估计,含水率(WC)和水提取率(ER)。在30%,50%和70% WC下,测试流量从250L/min到750L/min不等。水的提取率从50%到100%不等。基于最初的测试活动,该概念被证明是有希望的,在中等流速下,无论是水连续流还是油连续流,都显示出良好的分离效率(>98%)。在更高的流量下,性能会下降,为了保持高效率,必须限制水的提取率。在出水口的流动条件的照片包括,提供了一个可视化的发生两相流现象在分离器内。提出的概念增加了海底分离解决方案的扩展组合,并展示了利用平行管道实现油水分离的新方法。
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引用次数: 5
Displacement Efficiency for Primary Cementing of Washout Sections in Highly Deviated Wells 大斜度井冲蚀段初次固井顶替效率研究
Pub Date : 2018-10-19 DOI: 10.2118/191989-MS
A. Renteria, A. Maleki, I. Frigaard, B. Lund, A. Taghipour, J. D. Ytrehus
Anywhere between 0%-80% of cemented wells have integrity failures, suggesting both geological and operational factors. One way geology affects cementing is via irregular wellbores, e.g. washouts. Here we study the effects of washouts on mud removal in strongly inclined wellbores, experimentally and via 2-D computational simulations, with aim of identifying key control parameters. Experiments were performed with 2 fluids with properties representative of drilling mud and cement (or spacer), displaced at constant flow rate through a 10 m long annular flow loop. A downstream "washout" section of the annulus had an enlarged outer diameter. Twenty-four conductivity probes tracked the arrival times of the displacing fluid by measuring the conductivity of fluids as they pass. The experimental matrix includes 8 experiments with 2 eccentricities (standoff = 1, 0.58), 4 angles of inclination and slightly variable rheology. The simulation study covered wider ranges of variables. The results of simulations and experiments agree qualitatively on the main effects, as shown in [7]. Here we extend the study using the 2D simulation to study the effects of washout length and diameter, for both concentric and eccentric wells, all oriented horizontally. The simulations provide detailed information on the evolution of the fluid-fluid interfaces as they pass through the washout, as well as information on the velocity fields and stresses. In any near-horizontal section there is a delicate balance of buoyancy and eccentricity influences, in both regular and irregular geometries. Under some circumstances an irregular section seems to have a positive stabilizing effect on the interface. However, this positive message is balanced practically by uncertainty of washout size and in-situ mud properties and the positive effects are not universal. We find that increasing the washout diameter always appears to decrease the displacemnt efficiency, for both concentric and eccentric annuli. Increasing the washout length is less clear in its effects. In all cases, the main risk from residual drilling mud in isolated washouts is that it can contaminate the cement slurry as it passes.
0%-80%的固井存在完整性失效,这是地质和操作因素共同作用的结果。地质影响固井的一种方式是通过不规则井眼,例如冲蚀。在这里,我们通过实验和二维计算模拟研究了冲蚀对强倾斜井中泥浆清除的影响,目的是确定关键的控制参数。实验使用了两种具有钻井泥浆和水泥(或隔离剂)特性的流体,以恒定流量通过10米长的环空循环。环空下游“冲蚀”段外径增大。24个电导率探头通过测量流体经过时的电导率来跟踪取代流体到达的时间。实验矩阵包括8个实验,2个偏心率(距= 1,0.58),4个倾角和微变流变。模拟研究涵盖了更大范围的变量。模拟结果与实验结果在主要影响上的定性一致,如[7]所示。在这里,我们使用2D模拟扩展了研究,研究了同心井和偏心井的冲蚀长度和直径的影响,所有井都是水平定向的。模拟提供了流体-流体界面通过冲蚀时的详细演化信息,以及速度场和应力信息。在任何接近水平的部分,在规则和不规则的几何形状中,浮力和偏心影响都有一个微妙的平衡。在某些情况下,不规则截面似乎对界面有积极的稳定作用。然而,这种积极的信息实际上被冲蚀尺寸和原位泥浆性质的不确定性所抵消,而且积极的影响并不普遍。我们发现,无论对同心环空还是偏心环空,增大冲蚀直径总是会降低驱替效率。增加冲洗长度的效果不太清楚。在所有情况下,隔离冲蚀中残留的钻井泥浆的主要风险是,当它通过时,可能会污染水泥浆。
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引用次数: 6
Evaluation of Frac Hit Risks in Aishwarya Barmer-Hill Field Development Utilising GIS Platform 基于GIS平台的Aishwarya Barmer-Hill油田压裂冲击风险评价
Pub Date : 2018-10-19 DOI: 10.2118/192117-MS
Shashank Pathak, R. Tibbles, A. Bohra, S. Tiwari, Preeti Godiyal, Aniket Deo
Frac Hit is an inter-well communication event where an offset well is affected by the pumping of a hydraulic fracturing treatment in a new well. Close well spacing, increased fracture density (number of fracs per well), and larger fracture treatments increase the chance of a Frac Hit. This paper demonstrates how a Geographic Information System (GIS) was used in the Barmer Hill oil reservoir to quantify the risks of a Frac Hit on a well by well basis. The Aishwarya Barmer Hill (ABH) field (<1 mD/cp) overlies the prolific Aishwarya Fatehgarh (AF) field (>3 Darcy's). The AF field was developed first with 71 wells. All of these wells for AF reservoir penetrated through shallower ABH reservoir at an average spacing of ∼100 m. The ABH field development plan calls for 1000 m long horizontal laterals with a ∼180 m distance between the wells to efficiently drain the entire ABH structure. The hydraulic fractures planned in ABH wells had an average fracture half-length of ∼100 m with 10 stages per well. With the spacing equal to the fracture half length, the likelihood of a Frac Hit between ABH horizontal wells was high. The presence of the nearby AF wells only added to the risk. GIS enabled software was used to evaluate the risk magnitude and the observations were used to prepare a mitigation plan. All the well trajectories for both reservoirs were mapped inside the 3D reservoir structure. As a first case, a potential strike zone (PSZ) with a radius equal to the frac half-length was generated around the planned ABH wells. Wells were considered at risk if a PSZ intersected another well or another PSZ. Then all of the planned hydraulic fractures were mapped in 3 dimensions using the known fracture propagation azimuth (from appraisal well micro-seismic data) and the simulated fracture dimensions (Half-lengths & heights) using fully 3D frac modeling software. The procedure clearly identified the cases (well/stage) which had a high potential for a Frac Hit. After identifying the high-risk cases, appropriate steps were taken to minimize the risk. The available options were to change the well trajectory, modify the fracture location (shift or remove stages), or propose additional surveillance. The Frac Hit phenomena is a sub-surface integrity related concern which has been reported on in many technical papers. This work proposes a method for quantifying and minimizing the risks using a GIS platform. A method for categorizing the various risk cases based on well spacing, perforation and fracture initiation points is proposed. This method was studied for the ABH wells during the well planning phase and shall be applied in order to minimize Frac Hit risks. The information provided could also be directly utilized for in-fill development project for tight fields.
压裂冲击是井间通信事件,当邻井受到新井水力压裂处理泵送的影响时。缩小井距、增加裂缝密度(每口井的裂缝数量)以及加大压裂处理力度,都增加了压裂命中的几率。本文演示了如何在Barmer Hill油藏中使用地理信息系统(GIS),以每口井为基础量化压裂冲击风险。Aishwarya Barmer Hill (ABH)油田(3 Darcy’s)。AF油田首先开发,共71口井。所有AF油藏的井均以平均100 m的井距穿透较浅的ABH油藏。ABH油田开发计划要求1000米长的水平分支井,井间距离为180米,以有效地排出整个ABH结构。在ABH井中计划的水力裂缝平均半长为~ 100 m,每口井有10级压裂。当间距等于裂缝的一半长度时,ABH水平井之间发生压裂冲击的可能性很高。附近AF井的存在只会增加风险。利用支持地理信息系统的软件评估风险程度,并利用观测结果编制减灾计划。这两个油藏的所有井眼轨迹都被绘制在三维油藏结构内部。作为第一个案例,在计划的ABH井周围产生了一个半径等于压裂半长的潜在走向带(PSZ)。如果一个射孔区与另一口井或另一口射孔区相交,则认为该井存在风险。然后,利用已知的裂缝扩展方位角(来自评价井微地震数据)和模拟裂缝尺寸(半长和高度),利用全三维裂缝建模软件,将所有计划的水力裂缝绘制成三维图。该程序可以清楚地识别出可能发生压裂冲击的情况(井/段)。在确定高危病例后,采取适当措施将风险降至最低。可用的选择包括改变井眼轨迹、修改裂缝位置(移位或移除分段),或者提出额外的监控措施。压裂冲击现象是一个与地下完整性相关的问题,在许多技术论文中都有报道。这项工作提出了一种使用GIS平台量化和最小化风险的方法。提出了一种基于井距、射孔和裂缝起裂点对各种风险情况进行分类的方法。该方法是在井规划阶段针对ABH井进行的研究,旨在将压裂冲击风险降至最低。所提供的信息也可直接用于致密油田的充填开发项目。
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引用次数: 1
Early-Stage Detection of Scales in a Deepwater Field Offshore Ghana via Remote Monitoring of Multiphase Meter 基于多相计远程监测的加纳深水油田水垢早期检测
Pub Date : 2018-10-19 DOI: 10.2118/191960-MS
M. Darab, R. Nygaard, A. Singh
Multiphase metering has enabled addressing a number of flow assurance challenges, including the detection of scale formation. This capability is especially appreciated in subsea fields, where the physical access is restricted and flow assurance challenges can be detrimental to maintaining production with a reasonable cost. The scale detection capability of the multiphase flowmeters using live multiphase flow data facilitates a proactive approach by the operators to detect and remediate productivity and flow assurance issues arising out of scale deposition. A successful early-stage detection of scales in an oil well in deepwater field offshore Ghana via remote monitoring of multiphase metering data is reported. The displacement of the operating point of the multiphase meter and the swift developments in a matter of days provided the necessary live data for the hypothesis of the scale formation in the meter's venturi. Necessary mitigation action was taken and increases in production due to removal of scale demonstrated presence of scale. An in-house-developed remote surveillance and diagnostic system carried out this detection. The results of this project demonstrate the practical capability of remote monitoring of multiphase metering data for flow assurance purposes.
多相计量能够解决许多流动保障挑战,包括检测结垢地层。这种能力在水下油田尤其受欢迎,在水下油田,物理通道受到限制,流动保障挑战可能不利于以合理的成本维持生产。多相流量计使用实时多相流数据进行结垢检测,便于作业者主动检测和修复因结垢而产生的产能和流动保障问题。据报道,通过远程监测多相计量数据,成功地在加纳近海深水油田的一口油井中进行了早期水垢检测。多相计工作点的位移和数天内的迅速发展为该计文丘里管结垢假说提供了必要的实时数据。采取了必要的缓解行动,由于去除水垢而增加的产量表明存在水垢。内部开发的远程监测和诊断系统进行了这项检测。该项目的研究结果表明,多相计量数据的远程监测具有一定的实用价值。
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引用次数: 0
Injectivity and Well Deliverability Test and Analysis in an Offshore Complex High CO2 Gas Carbonate Asset 海上复杂高CO2气碳酸盐岩资产注入能力与产能测试分析
Pub Date : 2018-10-19 DOI: 10.2118/191961-MS
R. Masoudi, Muhammad Afiq Abd. Wahab, E. Motaei, A. Ataei
Among the key uncertainties and risks as part of development of a high CO2 offshore gas carbonate field; production well deliverability, produced CO2 management, and cap rock integrity have been identified as potential techno-commercial showstoppers that need further appraisal and studies. CO2 storage and sequestration in the aquifer of the same field was identified as the most feasible and economic option for the Produced CO2 management and hence the injectivity within the targeted intervals and aquifer become part of the appraisal and study scope. An extensive over 200 m coring program covering various intervals including overburden, caprock, carbonate hydrocarbon intervals and aquifer has been designed as part of data acquisition and surveillance plan. The main plan scope were designed as:To establish reservoir properties & characterizationTo measure formation pressure and acquire fluid sampleTo establish reservoir injectivity and productivity at the prospective intervalsTo acquire data for flow assurance analysis, facilities design and well material selection studies for development planning. The test and analysis has been successfully conducted covering the intended scope of the plan. Based on the Well test and PTA, the reservoir permeability is calculated and is more or less aligned with the core permeability with the total high skin which the majority comes from geometrical/limited-entry skin. The productivity index is calculated to be 21 STB/day/psi. There is difficulty to analyze the Injectivity test due to non-isothermal effects during injection and fall-off test where the fluid property of both injected water and reservoir water is a function of temperature and time. An approximate method is applied using the average temperature during the fall-off to simplify the case by considering a constant fluid property. Injectivity Index is estimated from rate and pressure data to be around 26 STB/day/psi. However, it declined by time to reach a value close to 13 STB/day/psi. In the second test, Based on pressure transient analysis the homogeneous, vertical well with limited entry, and infinite boundary model with underneath aquifer was accepted as representative for S2 reservoir. To capture the non-Darcy effect, the rate dependent skin model is selected. Non-Darcy coefficient is extracted from well model for IRP in well model (1.0073E-4 (Mscf/day)-1. Generally, the well test and injectivity and productivity analysis objectives are achieved as the fluid type is also confirmed. The paper will detail out the actual test results, methodology and evaluation approaches in this surveillance plan.
海上高二氧化碳碳酸盐岩气田开发的主要不确定性和风险;生产井产能、二氧化碳排放管理和盖层完整性已被确定为潜在的技术-商业亮点,需要进一步评估和研究。在同一油田的含水层中储存和封存二氧化碳被认为是最可行和最经济的二氧化碳排放管理方案,因此目标层段和含水层内的注入能力成为评价和研究范围的一部分。作为数据采集和监测计划的一部分,已经设计了一个超过200米的广泛取心方案,涵盖了不同的层段,包括覆盖层、盖层、碳酸盐岩烃层和含水层。主要计划范围设计为:建立储层性质和特征;测量地层压力并获取流体样品;在预期层段建立储层的注入能力和产能;获取流动保证分析、设施设计和井材料选择研究数据,以进行开发规划。测试和分析已经成功地覆盖了计划的预期范围。基于试井和PTA,计算了储层渗透率,并与岩心渗透率基本一致,总高表皮主要来自几何/有限进入表皮。产能指数计算为21 STB/天/psi。注落试验中,注入水和储层水的流体性质都是温度和时间的函数,由于非等温效应,给注入性测试分析带来了困难。在考虑流体性质恒定的情况下,采用沉降过程中平均温度的近似方法简化了计算过程。根据速率和压力数据估计,注入指数约为26 STB/天/psi。然而,随着时间的推移,它逐渐下降,达到接近13 STB/天/psi的值。在压力瞬态分析的基础上,采用含地下含水层的均质、有限进入直井无限边界模型作为S2油藏的代表。为了捕捉非达西效应,选择了依赖于速率的皮肤模型。从井模型(1.0073E-4 (Mscf/day)-1)的IRP中提取非达西系数。一般来说,在确定流体类型的同时,也能达到试井和注入能力分析的目标。本文将详细介绍该监测计划的实际测试结果、方法和评估方法。
{"title":"Injectivity and Well Deliverability Test and Analysis in an Offshore Complex High CO2 Gas Carbonate Asset","authors":"R. Masoudi, Muhammad Afiq Abd. Wahab, E. Motaei, A. Ataei","doi":"10.2118/191961-MS","DOIUrl":"https://doi.org/10.2118/191961-MS","url":null,"abstract":"\u0000 Among the key uncertainties and risks as part of development of a high CO2 offshore gas carbonate field; production well deliverability, produced CO2 management, and cap rock integrity have been identified as potential techno-commercial showstoppers that need further appraisal and studies. CO2 storage and sequestration in the aquifer of the same field was identified as the most feasible and economic option for the Produced CO2 management and hence the injectivity within the targeted intervals and aquifer become part of the appraisal and study scope.\u0000 An extensive over 200 m coring program covering various intervals including overburden, caprock, carbonate hydrocarbon intervals and aquifer has been designed as part of data acquisition and surveillance plan. The main plan scope were designed as:To establish reservoir properties & characterizationTo measure formation pressure and acquire fluid sampleTo establish reservoir injectivity and productivity at the prospective intervalsTo acquire data for flow assurance analysis, facilities design and well material selection studies for development planning.\u0000 The test and analysis has been successfully conducted covering the intended scope of the plan. Based on the Well test and PTA, the reservoir permeability is calculated and is more or less aligned with the core permeability with the total high skin which the majority comes from geometrical/limited-entry skin. The productivity index is calculated to be 21 STB/day/psi. There is difficulty to analyze the Injectivity test due to non-isothermal effects during injection and fall-off test where the fluid property of both injected water and reservoir water is a function of temperature and time. An approximate method is applied using the average temperature during the fall-off to simplify the case by considering a constant fluid property. Injectivity Index is estimated from rate and pressure data to be around 26 STB/day/psi. However, it declined by time to reach a value close to 13 STB/day/psi. In the second test, Based on pressure transient analysis the homogeneous, vertical well with limited entry, and infinite boundary model with underneath aquifer was accepted as representative for S2 reservoir. To capture the non-Darcy effect, the rate dependent skin model is selected. Non-Darcy coefficient is extracted from well model for IRP in well model (1.0073E-4 (Mscf/day)-1.\u0000 Generally, the well test and injectivity and productivity analysis objectives are achieved as the fluid type is also confirmed. The paper will detail out the actual test results, methodology and evaluation approaches in this surveillance plan.","PeriodicalId":11240,"journal":{"name":"Day 1 Tue, October 23, 2018","volume":"15 6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78337253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Optimising Horizontal Coal Seam Gas Wells by Combining Reservoir Simulation and Transient Well Modelling 储层模拟与瞬态井建模相结合的煤层气水平井优化设计
Pub Date : 2018-10-19 DOI: 10.2118/192010-MS
Turaj Nuralishahi, Maryam Vahmani, Erni Dharma Putra, Moh Hsiao Wun, K. Thakur, Phyoe Wai Aung, Chris Coman, S. Delfani, Kyle Wimbridge, N. Rodriguez, Johny Samaan
In 2017, APLNG drilled the first horizontal wells within the Surat Basin targeting the Walloon coal seam gas (CSG) measures. This reservoir is quite shallow with the potential for relatively low pressures. To address this uncertainty, a study was performed to identify an optimum operational strategy to maximise the cumulative gas production of a well over the first five years of production. This was achieved by using a Latin Hypercube sampler and a Genetic Algorithm optimiser to identify optimum reservoir simulation scenarios. The optimized simulation scenarios were then modelled within a multiphase transient simulation model, to better understand the flow regime behaviour within the wellbore. This predicted the flowing potential of the well whilst modelling flow assurance risks such as wellbore slugging. The result was an innovative workflow that identified optimum operational strategies whilst accounting for the uncertainties in reservoir pressure and the fluid hydraulics in the wellbore. After completing the reservoir optimisation studies, the optimised cumulative gas production showed increases between 3% – 6% compared to the base case. Other improvements included; higher peak gas production, higher peak water production resulting in earlier desorption of gas, shorter time to initial gas, and shorter time to peak gas. After running the optimised reservoir simulation cases through the transient models, it was found that the days to peak gas was reduced by 80-90%, whilst the slugging periods were reduced by 90-100%. The models were also used to quantify the impacts of changing operational/design parameters such as horizontal well length, casing sizes, pump speeds, and choke settings. APLNG used these results to design their well start-up and ramp-up strategies, and successfully kick off their horizontal wells. The results of this innovative workflow for reservoir and wellbore modelling in a CSG field highlights the new insights that can be gained by combining traditional reservoir simulation with mathematical optimization and transient well flow modelling. These workflows enhance our understanding of how to improve efficiencies and maximise production volumes within CSG fields.
2017年,APLNG在Surat盆地钻了第一口水平井,目标是瓦隆煤层气(CSG)措施。该储层相当浅,具有相对较低压力的潜力。为了解决这一不确定性,研究人员进行了一项研究,以确定最佳的作业策略,从而在生产的前五年最大限度地提高一口井的累计产气量。这是通过使用拉丁Hypercube采样器和遗传算法优化器来确定最佳油藏模拟场景来实现的。然后在多相瞬态模拟模型中对优化的模拟场景进行建模,以便更好地了解井筒内的流动状态。这可以预测井的流动潜力,同时模拟井筒段塞等流动保障风险。其结果是一个创新的工作流程,在考虑油藏压力和井筒流体液压不确定性的情况下,确定了最佳的操作策略。在完成储层优化研究后,与基本情况相比,优化后的累计产气量增加了3% - 6%。其他改进包括:产气峰值越高,产水峰值越高,导致气体解吸时间越早,初始产气时间越短,产气峰值时间越短。通过瞬态模型运行优化后的油藏模拟案例后,发现天然气峰值天数减少了80-90%,段塞期减少了90-100%。这些模型还用于量化操作/设计参数变化的影响,如水平井长度、套管尺寸、泵速和节流阀设置。APLNG利用这些结果设计了他们的井启动和爬坡策略,并成功地开始了他们的水平井。这一创新的储层和井筒建模工作流程的结果突出了将传统的储层模拟与数学优化和瞬态井流建模相结合可以获得的新见解。这些工作流程增强了我们对如何提高效率和最大限度地提高CSG油田产量的理解。
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引用次数: 0
The Lean Fluid Lifecycle: Optimizing Consumption and Waste in Hydraulic Fracturing Operations 精益流体生命周期:优化水力压裂作业的消耗和浪费
Pub Date : 2018-10-19 DOI: 10.2118/192068-MS
R. Jukes
This paper presents a case study reviewing the systematic optimization of fluid transport, consumption and waste in large hydraulic fracturing development campaigns. With a focus on reducing consumption, re-thinking transport, and creating value from waste fluid through recycling and reuse, the methodology applied has resulted in very real gains in economic, environmental, social and safety outcomes. The objective of this case study is to provide practical information and guidance for planning, execution and ongoing optimization to not only reduce the footprint of hydraulic fracturing activities but also reduce cost. By applying the methodology within this paper, the following was achieved over a 90 well development program: Fluid transport via trucking to wellsite virtually eliminated through use of the water production gathering network;Total fluid requirements reduced by 50%;Chemical costs reduced by 35%;Fluid disposal volume via trucking reduced by 95%; andFluid waste disposal costs reduced by 90%. While the case study presented is based on a coal bed methane (CBM) development where between 3,000 to 6,000 barrels of clean fluid was required per well, some or all of the methodologies may be applied to shale and conventional markets. With trends in stimulation volumes within the United States shale plays increasing more than threefold in recent years to upwards of 160,000 barrels per well (Dunkel, M. R., 2017), it is the responsibility of the industry to ensure that further growth into Australian shale markets – such as in the Northern Territory – are managed sustainably. For optimal results, fluid logistics cannot be an afterthought in development planning left to the hydraulic fracturing operation, but a key consideration in the overall project strategy.
本文介绍了一个大型水力压裂开发项目中流体输送、消耗和浪费的系统优化案例。所采用的方法侧重于减少消耗,重新思考运输,并通过回收和再利用从废液中创造价值,因此在经济、环境、社会和安全成果方面取得了非常实际的成果。本案例研究的目的是为规划、执行和持续优化提供实用信息和指导,不仅可以减少水力压裂活动的占地面积,还可以降低成本。通过应用本文中的方法,在90口井的开发项目中实现了以下目标:通过使用采水收集网络,几乎消除了通过卡车运输到井场的流体运输,总流体需求量减少了50%,化学成本降低了35%,卡车运输的流体处理量减少了95%。流体废物处理成本降低90%。虽然所介绍的案例研究是基于煤层气(CBM)开发,每口井需要3000至6000桶清洁流体,但部分或全部方法可能适用于页岩和常规市场。近年来,随着美国页岩油增产量的增长趋势增加了三倍多,达到每口井16万桶以上(Dunkel, m.r, 2017),油气行业有责任确保澳大利亚页岩油市场(如北领地)的进一步增长得到可持续管理。为了获得最佳效果,流体物流不能成为水力压裂作业开发规划中的事后考虑,而是整个项目战略中的关键考虑因素。
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引用次数: 0
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