Method and device for determining size of cement loop and drilling method

Abstract

The invention provides a method and device for determining the size of a cement loop and a drilling method. The method for determining the size of the cement loop includes the steps that the plastic strain amplitude of each segment of the cement loop is calculated based on a stress equation; under the condition that the radial deformation increment is the same, according to the plastic strain amplitude of two different segments of the cement loop and the cycle numbers of suffered load of the two different segments of the cement loop when being destroyed, the thickness relation between the twodifferent segments of the cement loop is calculated; and the inner radius size and the outer radius size of each segment of the cement loop are determined according to the thickness relation between the two different segments of the cement loop, and the size of the entire cement loop is obtained. According to the method and device for determining the size of the cement loop and the drilling method, intercoordination of cementing cement loop deformation of fracturing sections is ensured, and damage of the cement loop integrity caused by multi-segment fracturing is prevented.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration, in particular to a method for determining the size of a cement sheath, a drilling method and a device. Background technique [0002] During the cementing process, the cement material solidifies in the downhole environment to form a cement sheath with certain cementing ability. The cement sheath is an important barrier to ensure the effective sealing of the wellbore. How to ensure the integrity of the cement sheath is a special concern in cementing engineering. Multi-stage and staged fracturing is an important means to improve the effectiveness of oil and gas resource development, but during the stimulation process, there will be serious problems of wellbore integrity failure, and the casing deformation ratio in some blocks even reaches 40%, resulting in The failure of staged fracturing has severely restricted the development of oil and gas resources. [0003] The main reason fo...

AI Technical Summary

Problems solved by technology

Multi-stage and staged fracturing is an important means to improve the effectiveness of oil and gas resource development, but during the stimulation process, there will be serious problems of wellbore integrity failure, and the casing deformation ratio in some blocks even reaches 40%, resulting in Ineffective staged fracturing, seriously restricting the development of oil and gas resources

[0003] The main reason for the damage to the integrity of the cement sheath during multi-stage staged fracturing is that the damage to the cement sheath caused by cyclic loads in different fracturing sections is different, resulting in the uncoordinated strain of the cement sheath in different fracturing sections. , eventually leading to the destruction of the integrity of the cement sheath

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