Method for realizing effective sealing of end part of hydraulic crack

Abstract

The invention discloses a method for realizing effective sealing of the end part of a hydraulic crack. The method includes the steps that mixed-particle-size ultra-low-density proppant and soluble fiber are mixed and injected into the end part of the crack; the apparent density of the proppant is 1.05-1.25g / cm<3>; the mixed-particle-size proppant of 140-230 meshes and 70-140 meshes is used; the fiber length is 1-2 cm; and the mass ratio of the fiber to the proppant is (1 to 10) to (1 to 20). The length of the paving front edge of the proppant is equal to that of the crack generation, and the length of the proppant is 10-15m from the crack end to the near-well direction, the crack generation width is greater than or equal to the support width, and the error of the support crack width and the crack generation length on the corresponding length is within 10%. The method improves the effectiveness of the sealing of the end part of the hydraulic crack so that the crack after temporarily sealed can be effectively turned and extended to the far-well region, the complexity and the reformed volume and the complexity within the full length of a main crack are improved to solve the limitationof the current technology, and the reservoir yield-increasing effect is maximized.

Description

Technical field [0001] The invention relates to the technical field of petroleum drilling, and more particularly, to a method for realizing effective plugging of the ends of hydraulic fractures. The invention can be used for tight sandstone, shale and other oil and gas reservoirs, and can be used for vertical wells and horizontal well hydraulic fracturing. Background technique [0002] At present, whether it is deep shale gas, atmospheric shale gas, and tight sandstone oil and gas reservoirs, in hydraulic fracturing, it is necessary to effectively seal the ends of the fractures to greatly increase the net pressure in the fractures and promote branch fractures. The initiation and extension of the crack. Of course, to achieve effective plugging of fracture ends, an important prerequisite is the effective control of fracture height. Especially in tight sandstone or massive carbonate reservoirs, the control of fracture height is more important. In shale oil and gas reservoirs, due ...

AI Technical Summary

Problems solved by technology

In view of the problem that the complex fractures caused by the current hydraulic fracturing fracture end plugging technology mainly exist in the mid-well or near-wellbore fracture zone, through the fracture height control technology at the fracture end, proppant type and particle size optimization, proppant injection timing and injection procedure Optimization and other comprehensive optimization technologies to improve the effectiveness of hydraulic fracture end plugging, so that the fractures can be effectively diverted and extended to the far well zone after temporary plugging, and the complexity and stimulation volume within the full length of the main fractures are increased to solve the problem of current technical problems. to maximize the effect of reservoir stimulation