深层脆性页岩井钻井液漏失机理及主控因素

李文哲; 于兴川; 赖燕; 刘厚彬; 文雯; 张震; 吴申尭

doi:10.3969/j.issn.1006-6535.2022.03.024

特种油气藏 >

2022 , Vol. 29 >Issue 3: 162 - 169

DOI: https://doi.org/10.3969/j.issn.1006-6535.2022.03.024

钻采工程

深层脆性页岩井钻井液漏失机理及主控因素

李文哲 ,
于兴川 ,
赖燕 ,
刘厚彬 ,
文雯 ,
张震 ,
吴申尭

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1.四川长宁天然气开发有限责任公司,四川成都 610051;
2.西南石油大学油气藏地质及开发工程国家重点实验室,四川成都 610500;
3.西南石油大学,四川成都 610500;
4.中国石油长庆油田分公司,陕西榆林 719000;
5.中国石油西南油气田分公司,四川成都 610051

李文哲(1987—),男,工程师,2010年毕业于成都理工大学石油工程专业,现从事钻井工程技术管理工作。

收稿日期: 2021-07-22

修回日期: 2022-03-09

网络出版日期: 2023-01-09

基金资助

中国石油重大现场试验项目“深层页岩气有效开采关键技术攻关与试验”(2019F-31)

收起

Lost Circulation Mechanism and Main Controlling Factors in Deep Brittle Shale Wells

Li Wenzhe ,
Yu Xingchuan ,
Lai Yan ,
Liu Houbin ,
Wen Wen ,
Zhang Zhen ,
Wu Shenyao

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1. Sichuan Changning Natural Gas Development Co., Ltd., Chengdu, Sichuan 610051, China;
2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
3. Southwest Petroleum University, Chengdu, Sichuan 610500, China;
4. PetroChina Changqing Oilfield Company, Yulin, Shaanxi 719000, China;
5. PetroChina Southwest Oil and Gasfield Company, Chengdu, Sichuan 610051, China

Received date: 2021-07-22

Revised date: 2022-03-09

Online published: 2023-01-09

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摘要

四川长宁区块页岩气资源丰富,但在水平井钻井中钻井液漏失问题突出,制约了长宁区块页岩气资源勘探开发进程。基于单井测井数据与地震解释数据,建立了长宁区块页岩气地层裂缝、地应力及地层压力展布模型,研究了三者与钻井液漏失情况的响应关系。结果表明:长宁区块构造背斜高部位裂缝密度大,地层埋藏浅地应力小,闭合裂缝的开启临界压力与裂缝延伸临界压力都较小,地层孔隙压力低,钻井液漏失情况严重;构造向斜低部位裂缝密度相对于构造高部位小,地层埋藏较深地应力大,闭合裂缝的开启临界压力与裂缝延伸临界压力都较大,地层孔隙压力高,钻井液漏失情况不突出。长宁区块断层裂缝发育,钻井液漏失主要为压差性漏失和闭合裂缝扩展性漏失。研究结果揭示了长宁区块深层页岩钻井液漏失机理,明确了其主要影响因素,可为长宁区块页岩储层防漏及效益化开发提供科学依据。

关键词： 钻井液漏失; 裂缝; 地应力; 地层压力; 页岩; 主控因素

本文引用格式

李文哲 , 于兴川 , 赖燕 , 刘厚彬 , 文雯 , 张震 , 吴申尭 . 深层脆性页岩井钻井液漏失机理及主控因素[J]. 特种油气藏, 2022 , 29(3) : 162 -169 . DOI: 10.3969/j.issn.1006-6535.2022.03.024

Abstract

In spite of abundant shale gas resources in Changning Block, Sichuan Province, the severe lost circulation of drilling fluid in horizontal well drilling is prominent restricts the exploration and development of shale gas resources in Changning Block. Based on single-well logging data and seismic interpretation data, a distribution model of shale gas formation fractures, crustal stress and formation pressure of shale gas reservoirs, Changning Block was established, and a study was conducted on the response relationship between them and lost circulation. The results showed that, the fracture density was high in the high position of the tectonic anticline in Changning Block, the formation was buried shallowly, the crustal stress was low, the critical pressure of opening and extension of closed fractures was low, the formation pore pressure was low, and the lost circulation of drilling fluid was severe; the fracture density in the low position of the tectonic syncline was lower than that in the high position, the formation was buried deeply, the crustal stress was high, the critical pressure of opening and extension of closed fractures was low, the formation pore pressure was high, the formation pore pressure was high, and the lost circulation of drilling fluid was subtle. The faults and fractures were developed in Changning Block, and the lost circulation of drilling fluid was mainly caused by pressure difference and closed fracture expansion. The results of the study disclose the lost circulation mechanism of drilling fluid in deep shale in Changning Block, and clarify the main influencing factors, which can be used as a scientific basis for lost circulation prevention and efficient development of shale reservoirs in Changning Block.

Key words： lost circulation of drilling fluid; fractures; crustal stress; formation pressure; shale; main controlling factors

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