煤层定向分段水力压裂增透装置应用试验研究

Title

Experimental study and application of directional subdivision hydraulicfracturing and permeability improvement device
作者

马文伟李江涛梁文勖
Author

MA Wenwei,LI Jiangtao,LIANG Wenxu
单位

煤科集团沈阳研究院有限公司煤矿安全技术国家重点实验室东北大学资源与土木工程学院
Organization

1.Shenyang Research Institute, China Coal Technology and Engineering Group, Shenyang ,China; 2.State Key Laboratory of Coal Mine Safety Technology, Fushun , China; 3. School of Resources and CivilEngineering, Northeastern University, Shenyang , China
摘要

煤层定向分段水力压裂技术是增加煤层透气性的有效方法，通过介绍定向分段水力压裂增透技术的基本原理，在实验室内试验了考察所研制的分段水力压裂关键装置的特性，并在淮南潘四东煤矿进行了现场工业试验，结果表明：高压封孔胶囊具有良好的膨胀性和抗收缩性，封孔效果良好，注水器的端堵扭力值在现场应用中应设定在3 N·m以上， 13-1煤层的起裂压力在28～30 MPa，单段压裂10 m距离所用的时间为1 h，耗水量10～13 t，压裂时间和耗水量均远小于全孔段水力压裂工艺；实施定向分段水力压裂增透措施后，煤层的平均瓦斯体积分数提高了1.72～3.04倍，平均混合流量提高了2.00～4.04倍，平均日抽采量提高了2.94～10.87倍，能够有效增加煤层透气性。
Abstract

Directional subdivision hydraulic fracturing is one of the most effective ways to increase permeability of coal seams. The basic principle of directional subdivision hydraulic fracturing technology is introduced in the paper. Laboratory tests were conducted to explore the characteristic of subdivision hydraulic fracturing key device. The results indicate that the high pressure sealing has good expansibility and anti-contractility and the end plugging torque of the water injector should be set at 3 N·m or more. The experiment results were then validated through practical applications in Pansidong coal mine. It show that the initiation pressure of 13-1 coal seam is 28～30 MPa,the time of single-stage fracturing 10 m is about one hour, and the water consumption is 10～13 t. It is also found that the fracturing time and water consumption of directional subdivision hydraulic fracturing are much less than those for full hole hydraulic fracturing technology.After directional hydraulic fracturing, the average gas concentration of coal seam is increased by 1.72～3.04 times, the average mixed flow rate is increased by 2.00～4.04 times, the average daily extraction capacity is increased by 2.94～10.87 times. This paper proves that the directional subdivision hydraulic fracturing device could effectively increase the permeability of coal seam.
关键词

定向分段水力压裂煤层增透瓦斯抽采压裂装置
KeyWords

directional subdivision hydraulic fracturing;permeability; gas extraction; fracturing device
基金项目(Foundation)

国家科技重大专项资助项目（2016ZX05045-004-001）
相关文章

[1]深部煤层单段/多段水力压裂增透效果对比
[2]点式水力压裂装置的试验研究与应用
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