致密油藏多级压裂水平井同井缝间注采可行性

doi:10.7623/syxb201712008

石油学报 ›› 2017, Vol. 38 ›› Issue (12): 1411-1419.DOI: 10.7623/syxb201712008

致密油藏多级压裂水平井同井缝间注采可行性

程时清¹, 汪洋¹, 郎慧慧¹, 于海洋¹, 朱常玉¹, 杨宝松¹, 张洪亮², 孙忠国³

1. 中国石油大学石油工程教育部重点实验室北京 102249;
2. 大庆油田有限责任公司采油九厂黑龙江大庆 163853;
3. 中国石油集团长城钻探工程有限公司工程技术研究院辽宁盘锦 124000

收稿日期:2017-01-17 修回日期:2017-08-22 出版日期:2017-12-25 发布日期:2018-01-05
通讯作者: 程时清,男,1963年8月生,1984年获大庆石油学院学士学位,2000年获中国科学院渗流力学研究所博士学位,现为中国石油大学(北京)教授、博士生导师,主要从事试井及油气藏工程教学及科研工作。Email:chengsq973@163.com
作者简介:程时清,男,1963年8月生,1984年获大庆石油学院学士学位,2000年获中国科学院渗流力学研究所博士学位,现为中国石油大学(北京)教授、博士生导师,主要从事试井及油气藏工程教学及科研工作。Email:chengsq973@163.com
基金资助:
国家重大科技专项（2017ZX05009-004）和国家自然科学基金石油化工联合基金项目（No.U1762101）资助。

Feasibility of inter-fracture injection and production for the same multistage fractured horizontal well in tight oil reservoir

Cheng Shiqing¹, Wang Yang¹, Lang Huihui¹, Yu Haiyang¹, Zhu Changyu¹, Yang Baosong¹, Zhang Hongliang², Sun Zhongguo³

1. Key Laboratory of Petroleum Engineering of the Ministry of Education, China University of Petroleum, Beijing 102249, China;
2. No.9 Oil Production Plant, Daqing Oilfield Limited Company, Heilongjiang Daqing 163853, China;
3. Engineering Research Institute, CNPC Great Wall Drilling Company, Liaoning Panjin 124000, China

Received:2017-01-17 Revised:2017-08-22 Online:2017-12-25 Published:2018-01-05

摘要/Abstract

摘要：

以大庆油田L致密油藏为例，评价了L致密油藏的压裂改造效果；通过现代产量递减分析和试井分析，总结了生产动态规律；论证了水平井准天然能量、注水吞吐、注CO₂吞吐开发效果。针对致密油藏水平井产量递减快的问题，提出多级压裂水平井同井缝间注采方法，即通过注采分隔装置和注采阀进行同井缝间注采，将井间驱替问题转化为缝间驱替问题。采用数值模拟方法，分别计算了准天然能量衰竭开发、注水吞吐、CO₂吞吐、同井缝间注采4种方式的开发指标。分析结果表明，注水吞吐只能短期内提高累积采油量，不能显著提高采收率；同井缝间注采的产量比CO₂吞吐的产量高、稳产期更长、递减率更小、开发效果更好。进一步提出了致密油藏有效开发方式，即先以准天然能量衰竭式开采，控制地层压力均衡下降，在井底压力降到饱和压力附近时，转入同井缝间异步注采。现场实施时，采用水平井缝间强凝胶封堵完井工艺，即在注采缝之间的水平段射孔、注入强凝胶、封堵套管外侧与岩石连通空间。安装注采分隔装置和配注阀，采用温和注水方式，发挥裂缝的渗吸作用，能控制注入水的快速推进，提高致密油藏产量和采收率。

关键词: 致密油藏, 缝间异步注采, 准天然能量, 注水吞吐, CO₂吞吐

Abstract:

Taking the tight oil reservoir L in Daqing oilfield as an example, the effect of fracturing, modern production decline and bottom-hole pressure were analyzed, and the efficiency of quasi nature energy development, water swallowing-spitting, and CO₂ huff and puff were comprehensively evaluated. Aiming at the challenges in fast decreasing production of horizontal well in tight oil reservoir, the inter-fracture injection and production method in the same well for multistage fractured horizontal well was proposed, i.e., the injection and production separating device and valve were used for inter-fracture injection and production in the same well to transform the inter-well displacement into inter-fracture displacement. The numerical simulation method was adopted to calculate the development indexes of four patterns including quasi-nature-energy depletion development, water swallowing-spitting, CO₂ huff and puff and inter-fracture injection and production in the same well, respectively. The comparative analysis on the indexes of four development patterns shows that water swallowing-spitting can only improve cumulative oil recovery in a short term, unable to significantly improve oil recovery efficiency. The oil rate of inter-fracture injection and production in the same well is higher than that of CO₂ huff and puff, characterized by longer stable production period, smaller decline rate and better development effect. Meanwhile, the effective development method of tight oil reservoir was put forward, i.e., the quasi-natural-energy depletion development was firstly used to control the reservoir pressure with equilibrium decrease, and when the bottom-hole pressure was decreased to saturation pressure or so, it was transformed into inter-fracture asynchronous injection and production. During field implementation, the completion technology of inter-fracture strong-gel plugging for horizontal well was adopted, i.e., the strong gel was injected to interval perforation between the injection and production fractures for plugging the connected space between outer casing and rocks. Meanwhile, the injection and production separating device and valves were allocated and moderate water injection were used to play the imbibition function of fractures and control the rapid advancement of injected water, so as to improve the production and recovery efficiency of tight oil reservoirs.

Key words: tight oil reservoir, inter-fracture asynchronous injection and production, quasi natural energy, water flooding swallowing-spitting, CO₂ huff and puff

中图分类号:

TE348

程时清, 汪洋, 郎慧慧, 于海洋, 朱常玉, 杨宝松, 张洪亮, 孙忠国. 致密油藏多级压裂水平井同井缝间注采可行性[J]. 石油学报, 2017, 38(12): 1411-1419.

Cheng Shiqing, Wang Yang, Lang Huihui, Yu Haiyang, Zhu Changyu, Yang Baosong, Zhang Hongliang, Sun Zhongguo. Feasibility of inter-fracture injection and production for the same multistage fractured horizontal well in tight oil reservoir[J]. Acta Petrolei Sinica, 2017, 38(12): 1411-1419.

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致密油藏多级压裂水平井同井缝间注采可行性

Feasibility of inter-fracture injection and production for the same multistage fractured horizontal well in tight oil reservoir

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