通许深部煤层气测试压裂技术探索及应用  

Exploration and application of deep coalbed methane test fracturing technology in Tongxu

作　　者：蒋艳芳[1] JIANG Yanfang(Research Institute of Petroleum Engineering and Technology,North China Oil and Gas Branch,Sinopec,Zhengzhou,Henan 450006,China)

机构地区：[1]中国石化华北油气分公司石油工程技术研究院,河南郑州450006

出　　处：《油气井测试》2023年第2期24-28,共5页Well Testing

摘　　要：通许区块山西组发育深部煤层,与浅层煤层气相比含气量高、游离气丰富,割理裂隙发育,压裂施工过程中滤失大、易形成短缝、加砂困难。前期采用浅层煤层气常规压裂技术压裂施工压力高,加砂困难,压后效果不理想。针对深部煤层储层特征及改造难点,开展了深部煤层气压前注入压降和原地应力测试,获取煤层参数,为压裂设计参数优化提供依据;同时,通过室内实验、数值模拟研究,探索试验了饱填砂压裂技术。现场A井山1煤层采用“大排量、大规模、饱填砂”体积压裂设计思路完成压裂施工,施工排量最高20 m 3/min,入地液量4315 m 3,加砂量347 m 3,是常规压裂加砂强度的7倍,压后最高日产气量7299 m 3,累计产气量71509 m 3,效果显著。该技术的试验成功,为深部煤层气压裂提供了技术指导。Deep coal seams are developed in the Shanxi Formation of Tongxu Block,with high gas content,rich free gas,and developed cleat fractures compared to shallow coalbed methane.During fracturing construction,there is large filtration,short fractures are easy to form,and sand addition is difficult.In the early stage,conventional fracturing technology for shallow coalbed methane was used,resulting in high fracturing pressure,difficult sand addition,and unsatisfactory results after fracturing.Aiming at the characteristics of deep coal seam reservoirs and the difficulties in their transformation,pressure drop and in-situ stress tests were carried out before injecting gas pressure into deep coal seams to obtain coal seam parameters and provide a basis for optimizing fracturing design parameters;At the same time,through indoor experiments and numerical simulation research,the saturated sand fracturing technology was explored and tested.On site,the design concept of“large displacement,large-scale,and saturated sand”volume fracturing was adopted for Well Hill 1 Coal Seam A to complete the fracturing construction.The maximum construction displacement was 20 m3/min,the amount of liquid injected into the ground was 4315 m3,and the amount of sand added was 347 m3,which was 7 times the strength of conventional fracturing sand addition.The maximum daily gas production after fracturing was 7299 m3,and the cumulative gas production was 71509 m3,with significant results.The successful test of this technology provides technical guidance for deep coal seam pneumatic fracturing.

关 键 词：深部煤层 割理发育 注入压降测试 原地应力测试 饱填砂 缝网压裂 数值模拟 清洁压裂液 

分 类 号：TE357[石油与天然气工程—油气田开发工程]