Geology-Engineering Integration Casing Deformation Prevention Technology and Its Application in Shale Gas,Luzhou Block
The deep shale gas resources in south Sichuan are rich,accounting for more than 80%of the whole shale gas resources in south Sichuan,among which Luzhou block is the key area of deep shale gas production.Although the construction of 10 billion square meters of deep shale gas production capacity has been fully started,the development of deep shale gas still faces many challenges due to the influence of multi-stage tectonic movements,such as complex structural characteristics,complex fracture systems,and complex ground stresses,and the problem of casing deformation is particularly prominent.The casing deformation rate of shale gas wells in Luzhou block is as high as 53%,resulting in low EUR of platform wells,which seriously restricts the development of economies of scale.In view of the above problems,through continuous technical research and tests,significant breakthroughs have been made in key technologies such as multi-stage fault and ground stress fine characterization,stress field instability evaluation,etc.,and a set of casing deformation prevention technology based on working mode of geology-engineering integration has been formed.The results show that the optimization of the whole process from geological evaluation to drilling and fracturing can be realized through the comprehensive application of geology-engineering integration casing prevention technology.During the drilling process,the main fracture-cavity anomalies and pressure complex zones were avoided successfully,and the borehole trajectory was scientifically optimized.Frac well casing deformation rate decreased to less than 30%,zero lost stages were achieved,and platform well conversion kilometers EUR increased by more than 30%.The application in Luzhou block fully proves the important role of geology-engineering integration casing deformation prevention technology in preventing casing deformation and increasing shale gas production,and also provides a valuable technical reference for the scale economy development of deep shale gas at home and abroad.
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