Elliptical wellbore design method adapting to deep ground stress

Abstract

The invention provides an elliptical wellbore design method adapting to deep ground stress. The method comprises determining an opening position of an elliptical wellbore and the elliptical wellbore depth h; detecting all ground stress at the ground from the elliptical wellbore to the position with the depth h and determining maximum ground stress delta1 and minimum ground stress delta2; determining the long axis direction of the elliptical wellbore according to the direction of the maximum ground stress delta1; calculating and determining elliptical wellbore parameters according to the maximum ground stress delta1 and the minimum ground stress delta2. According to the method, the ground stress at the elliptical wellbore position can be detected, and the elliptical wellbore parameters aredetermined by selecting the maximum ground stress and the minimum ground stress to ensure that the ground stress and the elliptical wellbore generate a coupling relationship, and the elliptical wellbore can effectively overcome the ground stress during use.

Description

technical field [0001] The invention relates to the technical field of supporting facilities in coal mines, in particular to a method for designing an elliptical wellbore adapted to deep ground stress. Background technique [0002] With the development of resource mining to the deep, it is more appropriate to use vertical shaft development because the shaft development method does not have high requirements on mining depth, coal seam conditions, and hydrogeological conditions. The vertical shaft is divided into main and auxiliary shafts, which control coal transportation, personnel and material transportation respectively. It is the throat of the mine, but the direction and magnitude of the ground stress play a vital role in the stability of the shaft, especially the magnitude and direction of the horizontal stress. The existing wellbore development shape is mainly circular, and the coupling relationship between the ground stress and the wellbore shape is basically not consi...

AI Technical Summary

Problems solved by technology

The vertical shaft is divided into main and auxiliary shafts, which control coal transportation, personnel and material transportation respectively. It is the throat of the mine, but the direction and magnitude of the ground stress play a vital role in the stability of the shaft, especially the magnitude and direction of the horizontal stress. The existing wellbore development shape is mainly circular, and the coupling relationship between the ground stress and the shape of the wellbore is basically not considered during the construction process, which will cause the wellbore to be damaged by the ground stress during the application process and cause losses