部署井下液压润滑阀,实现安全高效的射孔和生产测试策略——以印度尼西亚Jambaran高产气田为例

Rahmawan Rena, Ewan O. Robb, Ibnu Maulana, Aswin Batubara, Yulia Yulia, Wagianto Wagianto
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引用次数: 0

摘要

本文详细介绍了在印度尼西亚首次实施的深置式井下液压润滑器阀(DHLV)。作为Jambaran- tiung Biru (JTB)国家战略项目的一部分,该应用程序在中爪哇陆上Jambaran油田实施。Jambaran是一个大型碳酸盐岩气田,位于人口稠密地区附近。由于该油田的储层含有高浓度的CO2和H2S,因此设计完井时必须确保能够安全射孔和测试井,而不会危及周围地区。为了按照油藏管理策略进行生产,需要800英尺的油藏段排水。在最初阶段,我们考虑了多种完井设计,包括裸眼完井设计、多趟电缆射孔和套管井单趟连续油管射孔系统。考虑到安全和效率因素,选择了无钻机单次起下钻连续油管枪下入系统。将深坐DHLV作为射孔后控制井的主要障碍,可以在射孔作业期间节省大量的日常租赁成本。JTB油田是通过钻5口新井和1口再入井进行开发的。所有6口井的完井设计都很相似。采用了两步完井设计,以补偿油管移动负荷的寿命,该设计由抛光的井眼容器和下部完井的生产封隔器组合组成。完井的第二阶段包括7”× 5-1/2”油管,油管可回收安全阀(TRSV)、DHLV、永久井下仪表(PDHG)和生产密封组件。策略性地将PDHG放置在DHLV下方,可以在关井期间监测井底压力,而无需使用记忆仪表来验证DHLV在枪回收过程中是主要屏障。生产密封组件被绑回先前设置的抛光井眼下部容器中。深坐DHLV使作业人员能够(1)安全地下入长TCP射孔枪组合,每口井的总射孔长度可达911英尺,一次起下钻即可完成整口井的射孔;(2)POOH射孔枪有效地完成一次放油;(3)在出井之前,通过关闭DHLV而不是地面阀门,有效地启动压力累积阶段;(4)无需压井即可回收射孔枪组合。在完成所有6口井的完井和试井后,实施深层DHLV的好处立即得到了体现。通过不平衡射孔,省去了压井过程,并通过关闭DHLV立即进行压力积累,在整个无钻机完井作业中,运营商节省了约150万美元。
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Deployment of Downhole Hydraulic Lubricator Valve Enables Safe and Efficient Perforating and Production Testing Strategy – Case Study in Jambaran High Rate Gas Field, Indonesia
This paper details the first implementation of a deep-set downhole hydraulic lubricator valve (DHLV) in Indonesia. This application was implemented in Jambaran field, onshore Central Java as part of Jambaran-Tiung Biru (JTB) national strategic project. Jambaran is a large carbonate gas field development located in proximity to densely populated areas. Since the field's reservoir contains significant concentrations of CO2 and H2S, it was important to design the completions to be able to perforate and test the wells safely without endangering the surrounding area. To produce as per reservoir management strategy, 800 ft of reservoir section drainage was required. Multiple completion designs were considered in the initial stages which included consideration of an open hole completions design, multiple wireline perforating runs and a cased hole live well single trip coiled tubing gun system. The rigless single trip coiled tubing gun deployment system was chosen due to safety and efficiency factors. With a deep set DHLV as the primary barrier in controlling the wells following perforating substantial daily rental cost savings can be realized during perforating operations. JTB field was developed by drilling 5 new well plus 1 re-entry well. The completions design was similar in all 6 wells. A 2 step completion design was utilized, to compensate for life of well tubing movement load, this consisted of a polished bore receptacle and production packer assembly in the lower completion. The 2nd stage of the completion consisted of 7" × 5-1/2" tubing with Tubing Retrievable Safety Valve (TRSV), DHLV, Permanent Downhole Gauge (PDHG) and production seal assembly. Strategically placing the PDHG below the DHLV enabled monitoring of bottom hole pressure during shut in without use of memory gauges validating the DHLV as primary barrier during gun retrieval. The production seal assembly was tied back into the lower polished bore receptacle that was previously set. The deep-set DHLV enabled the operator to (i) safely run long TCP gun assemblies up to 911 ft of gross gun length per well to perforate the whole well in 1 trip, (ii) POOH guns efficiently with one time bleed off (iii) efficiently initiate the pressure build up phase by shutting in the well against the DHLV as opposed to a surface valve prior to flowing the well and (iv) gun assemblies retrieved without the need to kill the well. After completing and well testing all 6 wells, the benefits of implementing the deep-set DHLV was immediately realized. By perforating underbalanced, omitting the well kill process and immediately proceeding with pressure build up by closing the DHLV resulted in operator savings of approximately 1.5 million USD over the entire rigless completion campaign.
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