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首页> 外文会议>SPE/PS-CIM/CHOA international thermal operations and heavy oil symposium and international horizontal well technology conference >Horizontal Water Disposal Well Performance in a High Porosity and Permeability Reservoir
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Horizontal Water Disposal Well Performance in a High Porosity and Permeability Reservoir

机译：高孔隙度和渗透率油藏中的水平水处理井性能

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Nexen Petroleum International Ltd. (Nexen) has a 52 percentrninterest and is operator of the Masila Block in the Republic ofrnYemen. Oil and water are produced mainly from the underrnpressured Qishn Formation, a non-marine to marine clasticrnsequence of Lower Cretaceous Age, which is roughly 200 feetrnthick and lies at a depth of 5500 feet from surface. Currentlyrnoil production is 230,000 BOPD at a water cut of about 80rnpercent. The one million barrels of water produced each dayrnare currently reinjected under matrix injection pressures intorn24 vertical and 4 horizontal wells. These are completed in thernbest quality sands (the S2/S3 members of the Upper QishnrnFormation) that have average porosity and permeability ofrn20% and 3700 md, respectively.rnDespite the exceptional disposal reservoir quality, injectionrnproblems continue to exist that have caused Nexen to studyrnand evaluate numerous methods of improving injectivity.rnAfter extensive laboratory core and field testing, hypothesesrnhave been developed to explain the behaviour of the waterrndisposal wells including the so-called ‘check-valve effect’.rnHorizontal wells and proppant fractured wells were employedrnto test the hypotheses and to improve injectivity.rnThis paper reviews the laboratory results and discusses thernplacement of horizontal injectors along with the drilling andrncompletion details of the wells. The performance of thernhorizontal disposal wells under matrix injection is comparedrnto conventional vertical disposal wells and proppant fracturedrnvertical wells. Produced water is expected to reach 1.5rnMMBWPD and improvements in disposal well performancernwill reduce the number of wells that will need to be drilled tornhandle this volume, thereby improving overall project value.
机译：尼克森石油国际有限公司（尼克森）拥有52％的权益，是也门共和国马西拉区块的运营商。石油和水主要来自负压的Qishn层，这是下白垩纪的非海洋到海洋碎屑岩层序，其厚度约为200英尺，位于距地面5500英尺的深度。目前，诺尼尔产量为230,000 BOPD，含水率约为80％。目前，每天在基质注入压力下将每天生产的一百万桶水注入24口垂直井和4口水平井。这些都是在质量最好的砂岩（上Qishnrn地层的S2 / S3段）中完成的，平均孔隙度和渗透率分别为rn20％和3700 md。尽管处置储层质量异常优异，但仍然存在注入问题，这促使尼克森公司进行研究和评价。在进行了广泛的实验室核心和现场测试之后，已经提出了各种假设来解释水处理井的行为，包括所谓的“止回阀效应”。使用水平井和支撑剂压裂井来检验假设并本文回顾了实验室结果，并讨论了水平注入器的位置以及井的钻探和完井细节。将基质注入下的水平处置井的性能与常规垂直处置井和支撑剂压裂垂直井的性能进行了比较。预计采出水将达到1.5rnMMBWPD，处置井性能的提高rn将减少需要处理此数量的钻井的数量，从而提高整体项目价值。

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