柿庄南煤层气重复压裂裂缝形态反演及效果分析评价  

Fracture morphology inversion and effect evaluation of CBM refracturing in southern Shizhuang Block

作　　者：张万春[1] 郭布民[1] 孔鹏[2] 杜建波 陈玲[1] 王春林[1] ZHANG Wanchun;GUO Bumin;KONG Peng;DU Jianbo;CHEN Ling;WANG Chunlin(China Oilfield Services Ltd.,Tianjin 300459,China;China United Coalbed Methane Corp., Ltd., Taiyuan 030006, China)

机构地区：[1]中海油田服务股份有限公司,天津300459 [2]中联煤层气有限责任公司,太原030006

出　　处：《非常规油气》2022年第1期119-128,共10页Unconventional Oil & Gas

基　　金：国家科技重大专项“沁水盆地高煤阶煤层气高效开发示范工程——煤岩储层二次改造综合应用”(2017ZX05064)。

摘　　要：为解决柿庄南煤层气平均单井产量低、相对高产井产量大幅下降等问题,对该区块已重复压裂井实施概况和产气效果进行了归纳总结,利用G函数和净压力历史拟合分析了重复压裂裂缝特征,反演了重复压裂裂缝形态,并进一步探讨了裂缝形态与压裂效果的关系。结果表明柿庄南煤层气重复压裂裂缝特征可分为产生新缝、无新缝产生及缝高失控2类;重复压裂实际支撑裂缝半长为70.10~113.90 m,实际半缝长小于设计值;实际支撑裂缝高度为20.30~36.80 m,实际缝高大于设计值,裂缝易压穿煤层顶底板;重复压裂裂缝形态可分为狭长缝、高短缝及短宽缝3种类型,高产井裂缝形态多为狭长缝,高短缝次之,当裂缝形态为短宽缝时产气量较低。为后续柿庄南低产煤层气井重复压裂设计优化提供参考和指导。In order to solve this problem that average single-well low production,and relatively high yield well production has fallen sharply of CBM refracturing in southern Shizhuang Block,summarized refracturing wells construction and production situation,use G function and net pressure history fitting analysised the refracturing fracture characteristics,inversed the refracturing fracture morphology,and further explored the relationship between fracture morphology and the fracturing effect.The results showed that,refracturing fracture characteristics can be generally divided into generate new fracture,without generate new fracture,fracture height out of control three categories.Refracturing actual propped fracture half-length range of 70.10~113.90 m,the fracture half-length is less than the design value.Actual propped fracture height range of 20.30~36.80 m,the fracture height is greater than design value,refracturing fracture easily penetrate the coal seam roof and floor.Refracturing fracture morphology can be divided into narrow and long fracture,high short fracture,short wide fracture three types.High-yielding well fracture morphology the most is narrow and long fracture,high short fracture production is lower,the short wide fracture production is the lowest.For subsequent low productivity CBM well refracturing design optimization provided the reference.

关 键 词：煤层气 重复压裂 净压力拟合 裂缝形态 产量 

分 类 号：TE377[石油与天然气工程—油气田开发工程]