An optimized method to prevent casing damage caused by perforation

Abstract

The invention provides an optimizing method for preventing a sleeve from being damaged due to perforating. The optimizing method comprises the steps that a, a perforating phase angle is selected, specifically, when the difference between the minimum horizontal ground stress and the maximum horizontal ground stress is within 5 MPa, spiral perforating is conducted with the 90-degree perforating phase angle, the angle between the perforating direction and the maximum horizontal ground stress direction is 45 degrees, when the difference between the minimum horizontal ground stress and the maximum horizontal ground stress is larger than 7 MPa, oriented perforating is conducted with the 180-degree angle between the perforating direction and the maximum horizontal ground stress direction, and when the difference between the minimum horizontal ground stress and the maximum horizontal ground stress is between 5 MPa and 7MPa, spiral perforating is conducted with the 90-degree perforating phase angle, the angle between the perforating direction and the maximum horizontal ground stress direction is 45 degrees, or oriented perforating is conducted with the 180-degree angle between the perforating direction and the maximum horizontal ground stress direction; b, the perforating hole density and the perforating hole diameter are selected, specifically, the perforating hole density is between 13 holes per meter to 16 holes per meter, and the perforating hole diameter is 10.2-12.6 mm; and c, matching of the diameter of a perforating gun and the inner diameter of the sleeve is determined, specifically, the diameter of the perforating gun is 10-20 mm smaller than the inner diameter of the sleeve.

Description

technical field [0001] The invention relates to the technical field of oil field development optimization, in particular to an optimization method for preventing casing damage caused by perforation. Background technique [0002] With the long-term development of the oil field, the original stress of the formation is changed, showing that the horizontal stress is not equal, and the strength of the casing is weakened by perforation. The orientation of the hole and the direction of the stress have a significant impact on the life of the casing. However, the orientation of the hole and the size and direction of the in-situ stress together determine the orientation of the initial hydraulic fracture. If the initiation position of the hydraulic fracture cannot be effectively controlled, it will be difficult to achieve the purpose of fracturing diversion. Therefore, if you only care about casing protection and If the initiation of hydraulic fractures is neglected, the fracturing eff...

AI Technical Summary

Problems solved by technology

However, the orientation of the hole and the size and direction of the in-situ stress together determine the orientation of the initial hydraulic fracture. If the initiation position of the hydraulic fracture cannot be effectively controlled, it will be difficult to achieve the purpose of fracturing diversion. Therefore, if you only care about casing protection and Ignoring the initiation of hydraulic fractures will affect the fracturing effect and cause oilfield production reduction

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