煤层气泡沫水泥浆固井工艺技术及现场应用
第44卷 第2期
煤田地质与勘探 Vol. 44 No.2 2016年4月 COAL GEOLOGY & EXPLORA TION Apr . 2016
收稿日期: 2014-11-12
基金项目: 国家科技重大专项课题(2011ZX0560-001)
Foundation item ：National Science and Technology Major Project (2011ZX0560-001)
作者简介: 王楚峰(1969—)，男，湖北罗田人，博士研究生，从事固井液研究. E-mail ：yhq840310@https://www.360docs.net/doc/9215651295.html,
引用格式: 王楚峰，王瑞和，杨焕强，等. 煤层气泡沫水泥浆固井工艺技术及现场应用[J]. 煤田地质与勘探，2016，44(2)：116–120. WANG Chufeng ，WANG Ruihe ，YANG Huanqiang ，et al. Cementing technology of foam cement slurry for coalbed methane well and its ap-plication[J]. Coal Geology & Exploration ，2016，44(2)：116–120. 文章编号: 1001-1986(2016)02-0116-05
煤层气泡沫水泥浆固井工艺技术及现场应用
王楚峰1,2，王瑞和1，杨焕强3，周卫东1
(1. 中国石油大学(华东)石油工程学院，山东 青岛 266580；2. 中联煤层气有限责任公司，
北京 100011；3. 长江大学石油工程学院，湖北 武汉 430100)
摘要: 针对沁水盆地南部煤层气井储层压力低、易漏失、易坍塌的特点，开发了超低密度泡沫水泥浆体系及暂堵型前置液体系，并形成了泡沫水泥浆固井技术。泡沫水泥浆体系密度为 1.10~
1.20 g/cm 3，具有良好的流动性能、无游离液、沉降稳定性好、API 失水量小于50 mL/30 min 、稠化时间合理、水泥石强度高等优点；暂堵型前置液体系具有良好的流变性能，对3号煤层具有良好的堵漏能力。根据钻井过程中出现的漏失情况、完钻后的钻井液返出情况及井壁稳定情况，从固井浆体的用量、顶替液的顶替排量等方面总结了泡沫水泥浆固井的配套工艺措施。在沁水盆地南部现场试验了4口井，取得了较好的效果。
关 键 词：煤层气；泡沫水泥浆；暂堵型前置液；顶替排量；固井浆体用量
中图分类号：P634 文献标识码：A DOI: 10.3969/j.issn.1001-1986.2016.02.021
Cementing technology of foam cement slurry for coalbed
methane well and its application
W ANG Chufeng 1,2, W ANG Ruihe 1, Y ANG Huanqiang 3, ZHOU Weidong 1
(1. College of Petroleum Engineering , China University of Petroleum , Qingdao 266580, China ；
2. China United Coalbed Methane Co ., Ltd., Beijing 100011, China ；
3. College of Petroleum Engineering , Yangtze
University , Wuhan 430100, China)
Abstract: Aimed at the characteristics of CBM wells in south part of Qinshui basin, such as low pressure, easy leakage and easy collapse, high performance foam cement(HPFC) system of ultralow density and temporary plugging prepad fluid system were developed and cementing technology with foam cement slurry for coalbed methane well was formed. The density of HPFC system is 1.10~1.20 g/cm 3, it has many advantages, such as good flowing properties, no free liquid, stable sedimentation, small API filtration loss (≤50 mL/30 min), reasonable thickening time and high strength of set cement. The temporary plugging fluid system has good rheological proper-ties, good leaking stoppage capacity for seam.3. The paper summarizes technological matching measures of foam slurry cementing techniques from the amount of cementing slurry and displacement fluid on the basis of the leakage situation, returning situation of drilling fluid and hole wall stabilization condition. This cementing technology has been applied in 4 wells for field test at the southern Qinshui basin, and good effect is obtained.
Key words: coalbed methane; foam cement slurry; temporary plugging prepad fluid; displacing flow rate; cementing slurry amount
山西沁水盆地南部煤层气储层压力偏低，低储
层压力的储层占97%以上，孔隙压力梯度一般小于
0.01 MPa/m [1-3]。煤层气井在钻井过程中漏失现象严
重，固井过程中易造成水泥浆大量漏失入煤储层中，
严重影响水泥浆设计返排高度和固井质量[4-5]。同时，煤储层存在着互相垂直的天然裂纹、煤岩机械强度小、易破碎，钻井后井壁不稳定，易坍塌，井径扩大较为严重[6-8]。返出的钻井液时常携带较多的煤粉，使得钻井液流变性变差，固井时水泥浆顶替效率降低。因此，需要研究适合煤层气固井的水泥