关于超深油气井完井工程与油气藏采收率的思考

doi:10.11885/j.issn.1674-5086.2024.06.19.02

西南石油大学学报(自然科学版) ›› 2024, Vol. 46 ›› Issue (4): 169-177.DOI: 10.11885/j.issn.1674-5086.2024.06.19.02

• 深层超深层油气勘探开发专刊 • 上一篇下一篇

关于超深油气井完井工程与油气藏采收率的思考

任今明^1,2,3,4, 潘昭才^1,2,3, 黄锟^1,2,3, 冯少波^1,2,3, 张宝^1,2,3

1. 中国石油天然气集团有限公司超深层复杂油气藏勘探开发技术研发中心, 新疆库尔勒 841000;
2. 新疆维吾尔自治区超深层复杂油气藏勘探开发工程研究中心, 新疆库尔勒 841000;
3. 新疆超深油气重点实验室, 新疆库尔勒 841000;
4. 中国石油塔里木油田油气工艺研究院, 新疆库尔勒 841000

收稿日期:2024-06-19 发布日期:2024-08-24
作者简介:任今明， 1969 年生，男，汉族，四川南充人，高级工程师，硕士，主要从事提高采收率和采油工程等方面的研究工作。 E-mail： renjmtlm@petrochina.com.cn
潘昭才， 1972 年生，男，汉族，四川资中人，高级工程师，主要从事油气田开发研究工作。 E-mail：panzc-tlm@petrochina.com.cn
黄锟， 1973 年生，男，汉族，四川自贡人，高级工程师，主要从事采油工程、采气工程等方面的研究工作。 E-mail： huangktlm@petrochina.com.cn
冯少波， 1978 年生，男，汉族，湖南祁阳人，高级工程师，主要从事钻井工程方面的研究工作。 E-mail：CD678@126.com
张宝， 1977 年生，男，汉族，陕西咸阳人，高级工程师，主要从事采气等方面的研究工作。 E-mail：zhangbao-tlm@petrochina.com.cn

Reflections on Completion Engineering and Recovery of Ultra-deep Oil and Gas Wells

REN Jinming^1,2,3,4, PAN Zhaocai^1,2,3, HUANG Kun^1,2,3, FENG Shaobo^1,2,3, ZHANG Bao^1,2,3

1. R & D Center for Ultra-deep Complex Reservoir Exploration and Development, CNPC, Korla, Xinjiang 841000, China;
2. Engineering Research Center for Ultra-deep Complex Reservoir Exploration and Development, Xinjiang Uygur Autonomous Region, Korla, Xinjiang 841000, China;
3. Xinjiang Key Laboratory of Ultra-deep Oil and Gas, Korla, Xinjiang 841000, China;
4. Oil & Gas Technology Research Institute, Tarim Oilfield Company, PetroChina, Korla, Xinjiang 841000, China

Received:2024-06-19 Published:2024-08-24
Contact: 任今明，E-mail： renjm-tlm@petrochina.com.cn

摘要/Abstract

摘要： 超深油气藏的不断开发采收率与油气井的完井设计紧密相关。然而，由于钻井装备的限制、高压盐水层的存在、地层易垮塌和易漏失等开发特性以及经济评价因素的考量，超深油气井的完井方式多样(如裸眼完井、不超过$\phi$127 mm小尺寸油层套管完井等)；生产管柱穿越射孔顶界乃至射孔底界的设计；多选用永久型封隔器等，这些都可能增加生产作业的难度、延长作业时间和提高作业成本，并影响开井率和最终采收率。选取两个已投入开发的超深油气藏区块作为案例，分析发现砂或泥砂埋积是导致开井率低下的重要原因，进而对采收率产生不利影响。研究提出超深井完井的研究与设计应预设出砂或泥砂埋积的情景，旨在延长砂或泥砂埋积的时间，以便为后续作业创造有利条件，最终目标是提高采收率。为此，研究从完井方式、油层套管尺寸、完井管柱配置、封隔器类型选择以及沉砂口袋设计等5个关键方面进行了深入的科学研究与优化设计。在此基础上，进一步对钻完井投资、钻完井周期及经济评价指标进行了综合测算。若经济评价指标未达预期，则通过提升单井产量来解决建井质量提升与经济评价之间的潜在矛盾。

关键词: 超深井, 完井, 采收率, 完井管柱, 经济评价

Abstract: The continuous development of ultra-deep oil and gas reservoirs is closely related to the completion design of oil and gas wells. However, due to limitations in drilling equipment, the presence of high-pressure saline layers, geological characteristics such as prone-to-collapse and prone-to-leakage formations, as well as economic evaluation considerations, the completion methods for ultra-deep oil and gas wells exhibit significant diversity (open-hole completions, completions using small-sized reservoir casings not exceeding $\phi$127 mm, and so on). Designs featuring production strings traversing the perforation top boundary and even the perforation bottom boundary are also common, and permanent packers are often preferred. These factors can potentially increase operational difficulties, prolong operation times, elevate costs, and impact well productivity and ultimate recovery rates. By analyzing two already developed ultra-deep oil and gas reservoir blocks as case studies, it was discovered that the accumulation of sand or silt is a crucial factor contributing to low well productivity, subsequently adversely affecting recovery rates. In response, the study proposes that the research and design of ultra-deep well completions should anticipate scenarios of sand or silt accumulation. The objective is to prolong the duration of sand or silt accumulation, thereby creating favorable conditions for subsequent operations and ultimately enhancing recovery rates. To achieve this, the study conducted thorough scientific research and optimization on five key aspects: completion methods, reservoir casing sizes, completion string configurations, packer type selection, and sand pocket designs. Building upon these optimizations, comprehensive calculations were further performed for drilling and completion investments, drilling and completion cycles, and economic evaluation indicators. In cases where economic evaluation indicators fail to meet expectations, increasing single-well production is suggested as a means to resolve potential conflicts between enhancing well construction quality and meeting economic evaluations.

Key words: ultra-deep wells, completion, recovery rate, completion string, economic evaluation

中图分类号:

TE257

任今明, 潘昭才, 黄锟, 冯少波, 张宝. 关于超深油气井完井工程与油气藏采收率的思考[J]. 西南石油大学学报(自然科学版), 2024, 46(4): 169-177.

REN Jinming, PAN Zhaocai, HUANG Kun, FENG Shaobo, ZHANG Bao. Reflections on Completion Engineering and Recovery of Ultra-deep Oil and Gas Wells[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2024, 46(4): 169-177.

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Reflections on Completion Engineering and Recovery of Ultra-deep Oil and Gas Wells

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