论文成果
Investigation of hydraulic jet multistage cavity completion in coalbed methane horizontal wells
摘要:China is rich in coalbed methane resource. However,a low production rate is the long-time bottle-neck problem. In this paper,an innovative proposal of creating multistage cavities by hydraulic jet(abrasive jetting) in coalbed methane horizontal wells is presented. First, the advantages of horizontal cavity completion by hydraulic jet were discussed. Flexibility in achieving any cavity shape and size,pin-point jetting,precise segmentation,multi-stage pressure-relief,creating complex networks and meeting the demand of in-situ fluidized mining of underground coal resources are the major benefits. Subsequently,the FDEM method was implemented to calculate the stress-relief area and describe the fracture generation characteristics around the cavities,and then illuminate the production enhancement mechanisms. Then,the laboratory experiments of abrasive round jetting and rotating jetting on various types of coals under submerged conditions were conducted. Shapes of jetted holes,rock-breaking modes and impacts of natural fractures were investigated. The results indicated that the stratification cracking along the weak planes was the most important coal-breaking mechanism. Next,the critical downhole tools,technological processes and coal particles flow-back related to different completion methods such as open-hole,slotted liner,casing-perforated and roof indirect stimulated wells were introduced and discussed. Finally,the application prospects and geological adaptability of the proposed method were illustrated. The proposed technique can be applied in tectonic coal,deep coal,coal measured-strata,soft coal beds where hydraulic fracturing is ineffective or multi-lateral boreholes are difficult to re-entry. ? 2022 China Coal Society. All rights reserved.
ISSN号:0253-9993
卷、期、页:卷47期9:3284-3297
发表日期:2022-09-01
期刊分区(SCI为中科院分区):无
收录情况:EI(工程索引)
发表期刊名称:Meitan Xuebao/Journal of the China Coal Society
通讯作者:陈健翔,温海涛,秦小舟
第一作者:杨睿月,黄中伟,李根生
论文类型:期刊论文
论文概要:杨睿月,黄中伟,李根生,陈健翔,温海涛,秦小舟,Investigation of hydraulic jet multistage cavity completion in coalbed methane horizontal wells,Meitan Xuebao/Journal of the China Coal Society,2022,卷47期9:3284-3297
论文题目:Investigation of hydraulic jet multistage cavity completion in coalbed methane horizontal wells