Combined casing to prevent casing deformation during fracturing of shale gas wells
A shale gas well and combined casing technology, which is applied in the direction of casing, drill pipe, drilling equipment, etc., can solve the problems of plastic deformation and damage, and achieve the effect of simple structure and obvious protection effect
Active Publication Date: 2018-08-10
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology
[0004] The invention provides a combined casing for preventing casing deformation during fracturing of shale gas wells, so as to solve the problem that the casings used in shale gas wells are prone to plastic deformation or even damage during the hydraulic fracturing process
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[0027] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the present invention will now be described with reference to the accompanying drawings.
[0028] The applicant discovered during the hydraulic fracturing of shale gas wells that due to the development of bedding, fractures and faults in shale gas reservoirs, microseismic events in shale gas reservoirs will be triggered during hydraulic fracturing, and formations of a certain scale will occur. of misalignment. The shear force caused by formation dislocation acts indirectly on the casing through the cement sheath, and the shear force can be decomposed into a pair of force couples and a pair of opposite tensile forces. Under the action of the tensile force, the casing occurs Plastic deformation and even destruction eventually lead to the inability to continue the hydraulic fracturing of shale gas reservoirs, reducing the number of hydraulic fracturing stages ...
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The invention provides a combined sleeve for preventing sleeve deformation in shale gas well fracturing. The combined sleeve for preventing the sleeve deformation in the shale gas well fracturing comprises a least one section of a sleeve unit, wherein each section of the sleeve unit comprises a steel inner-layer sleeve, wherein inner-layer sleeve is provided with an upper connector and a lower connector; an outer sleeve made of high-strength fibers, sheathed outside the inner-layer sleeve; and a water-absorbing expansion device, installed between the outer sleeve and the inner-layer sleeve, and embedded in the outer sleeve, wherein the tensile strength of the high-strength fiber is more than 10 times greater than the tensile strength of the petroleum steel tube of the steel grade P110. The combined sleeve has the simple structure, and the obvious protection effect to the inner-layer sleeve.
Description
technical field [0001] The invention relates to the field of oil and natural gas drilling and completion, in particular to a drilling casing used in an oil field, in particular to a composite casing for preventing casing deformation during fracturing of a shale gas well. Background technique [0002] With the in-depth development of shale gas resources and the wide application of hydraulic fracturing technology, casings in shale gas blocks have been damaged to varying degrees during hydraulic fracturing, which has brought great harm to the development of shale gas resources. . At present, the casing of most shale gas wells adopts high-strength single-layer casing, but the existing casing is prone to plastic deformation or even damage, which eventually makes it impossible to continue the hydraulic fracturing of shale gas reservoirs , reducing the number of hydraulic fracturing stages and well production life cycle of shale gas reservoirs. [0003] To sum up, the following p...
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IPC IPC(8): E21B17/00
CPCE21B17/00
Inventor 项德贵陈朝伟王倩赵庆王鹏飞王思敏赵亦朋
Owner BC P INC CHINA NAT PETROLEUM CORP