Casing pipe device capable of reducing casing pipe shear deformation and using method thereof

Abstract

The invention relates to the technical field of oil and gas exploitation, and discloses a casing pipe device capable of reducing casing pipe shear deformation and a using method thereof. The casing pipe device is arranged at a shaft at the position where a crack zone is located and comprises a casing pipe, an upper centralizer and a lower centralizer, and the upper centralizer and the lower centralizer are arranged on the outer walls of the two ends of the casing pipe; a metal layer is arranged on the outer wall of the casing pipe, and a water swelling rubber layer is arranged on the outer wall of the metal layer. The using method of the casing pipe device comprises the following steps that 1) the shaft at the position, where the crack zone is located, in a stratum is determined through amicroseism method; (2) the casing pipe device is tripped in, the casing pipe device reaches the position where the crack zone is located, water circulation is conducted on the shaft, and the water swelling rubber layer is made to swell; and 3) cement is injected into the casing pipe and a borehole annulus, and well cementation operation is completed; In the process of reducing the shear deformation of the casing pipe, the thickness of a cement sheath is increased, and the metal layer with radial compressibility and the water swelling rubber layer are additionally arranged, so that the casuingpipe shear deformation caused by stratum slippage can be effectively prevented or reduced.

Description

technical field [0001] The invention relates to a casing device for reducing the shearing deformation of the casing and an application method thereof, which belong to the technical field of oil and gas exploitation. Background technique [0002] The complex structural geological conditions in oil and gas development make formation faults and fractures very developed, especially in the process of multi-stage fracturing, after the fracturing fluid enters natural fractures or weak bedding planes, it is easy to cause faults to slip and cause casing damage. Shear deformation. The results of microseismic measurements show that 53.6% of the deformation points of casing deformation wells in some areas are located in natural fractures, indicating that the shear caused by fault slip is the main form of casing deformation. After the casing is damaged, the fracturing plugging bridge or other downhole tools are blocked and cannot reach the predetermined position, resulting in prolonged ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects in the prior art, and provide a casing device and its application method for reducing the shearing deformation of the casing. The casing is deformed to solve the problem that the working tool cannot be lowered