以西伯利亚西部多边ERD井和鱼骨井水平段施工为例,说明常规做法对经济效益的影响

Maxim Pavlovich Frolov, D. Voitenko, Alexander Olegovich Proshin, Anastasiya Ivanova, V. I. Shepelev, Alexander Alexandrovich Verevochkin, Viacheslav Alexandrovich Pustovarov, S. Ignatyev
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引用次数: 0

摘要

本文详细介绍了在俄罗斯陆地上使用超低粘度钻井液进行ERD井水平段钻井的首次经验。这项工作具有重要的经验价值,可以重新评估钻井液参数对钻井过程的唯一影响的传统观点。本文从三个关键因素出发,综合考虑提高西伯利亚西部多边ERD井和FishBone井技术经济价值的关键方面和实践:了解钻井液流变特性;对井筒清洗建模结果进行深入分析,并将计算值与确定的工艺参数的实际值进行比较,以预测和控制ECD;客户和承包商的协同工作,即所谓的“主动监督”方法,旨在及时做出决策,以调整油井施工过程中的目标要求,即“现场”方法,以实现既定目标。工作中得出的主要结论是:在钻井液流变特性值最小的情况下,可以实现对环空空间的有效、充分的清洗。岩屑和大理石桥接剂参与滤饼的制作。在钻井低渗透储层时,泥浆成分中缺乏大理石桥接剂颗粒不能成为造成复杂问题(吸附、粘连)的原因。在确定大理石桥接剂的浓度时,应考虑以下几个因素:固控设备效率、地层渗透率、密度和钻井液成分。润滑油浓度、MBT等参数的推荐值的选择,首先要全面理解各参数的思想,其次要充分评估其在特定钻井条件下的重要性。有效的钻井液主动监管对钻井施工的经济效益有着重要的影响,而这种方法对客户和钻井液承包商都是有利的。在该项目中实施的方法可以节省高达60%的水平段钻井液成本,并减少了井的建设时间。工作的主要结果是:成功钻出了两口分支井,DDI分别为7.2和6.55,漏失风险很高。在没有任何着陆迹象的情况下,将尾管下至目标底部,完成了井的施工。然而,最重要的成就是将所提出的方法复制到更深的矿床开发中,这使我们能够在考虑钻井条件的情况下获得相当的技术和经济效果。
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Impact of Conventional Practices on Economic Efficiency as Illustrated by the Construction of Horizontal Sections of Multilateral ERD Wells and Fishbone Wells in Western Siberia
This paper is a detailed description of the first experience of an ERD wells horizontal section using ultra-low-viscosity drilling fluid as a drilling fluid implemented in the Russia land. This work has great value as an experience that allows to reevaluate the traditional views on the sole influence of drilling fluid parameters on the process of drilling wells. The thesis considers the key aspects and practices of improving the technical and economy values of drilling the multilateral ERD wells and FishBone wells in Western Siberia by applying an integrated approach based on three key factors: understanding the features of the rheology of drilling fluids; thorough analysis of the results of modeling wellbore washing and cleaning and comparing the calculated values with the actual values of the determined technological parameters in order to predict and control ECD; the collaborative work of the customer and the contractor, so-called "active supervising" methodology, aimed on making timely decisions for adjusting of the target requirements during the wells construction, "in situ" method, in order to achieve the made goals. The main conclusions have been made during the work: Effective and sufficient cleaning of annular space can be achieved with minimum values of drilling fluid rheology characteristics. Cuttings and marble bridging agent participate in the filter cake creation. The absence of marble bridging agent particles in the mud composition cannot be a reason of complications (absorption, sticking) when drilling low-permeability reservoirs. The concentration of the marble bridging agent should be determined, taking into account several factors: solids control equipment efficiency, formation permeability, density and drilling fluid composition. the recommended values for the parameters such as lubricant concentration and MBT, must be selected, firstly, based on comprehensive understanding of the idea of each parameter, and secondly, adequately assessing their significance under specific drilling conditions. Competent active supervising of drilling fluid has huge impact on the economy efficiency of well construction, whereas this approach can be beneficial for both the customer and the drilling fluid contractor. The implemented on the project approach allowed to save up to 60% for the cost of 1m3 of drilling fluid for horizontal section, as well as to reduce the time spent on the wells construction. The main result of the work: two multilateral wells were successfully drilled with the DDI of 7.2 and 6.55 and high risks of lost circulation. Wells construction was completed by running the liner to the target bottom without any signs of landings. However, the most important achievement is the emerging prospect of replicating the proposed approach to drilling ERD wells for deeper deposits development, that allows us to expect comparable technical and economy effects considering drilling conditions.
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