Fracturing method for improving compact oil and gas reservoir horizontal well oil layer reformation degree

Abstract

The invention discloses a fracturing method for improving a compact oil and gas reservoir horizontal well oil layer reformation degree. The method comprises the following steps that horizontal wells arranged in the same block are parallel to each other, wherein horizontal shafts are perpendicular to a maximum principal stress direction of a stratum; and dense fracture distribution is conducted in a fixed-point fine perforation and segment spacing reduction subdivision cutting mode, the segment spacing is optimized through full-three-dimensional fracturing software simulation in combination with an underground micro-seismic fracture monitoring result, and artificial fracture reformation ranges of every two adjacent segments are spliced. The method can effectively solve problems of the low oil layer reformation degree and the low single well yield of the horizontal wells, and also solves problems of large-scale removal and relocation of construction equipment and the personnel, the high fracturing cost and the low construction efficiency of the horizontal wells.

Description

technical field [0001] The invention belongs to the field of exploration and development of oil and gas fields, and relates to a fracturing method for improving the oil layer stimulation degree of horizontal wells in tight oil and gas reservoirs. Background technique [0002] At present, for tight oil and gas reservoirs, the conventional horizontal well fracturing technology has the following characteristics: 1. The fracturing operation scale is large, and the injection displacement is generally ≥6m 3 / min, the amount of liquid entering the ground in a single section≥800m 3 ; 2. The general fracturing method of multi-cluster perforation has poor crack initiation effectiveness, and all clusters cannot be cracked; 3. The fractures produced are complex and irregular in shape; 4. The controllability of the fracture extension direction is poor. Artificial fractures are easy to channel with water injection wells; 5. The interval between sections is relatively large, generally 120...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned shortcoming of prior art, provide a kind of fracturing method that improves the degree of stimulation of oil layer of horizontal well of tight oil and gas reservoir, this method can effectively solve the problem of low degree of stimulation of oil layer of horizontal well, single well production, At the same time, solve the problems of large relocation of horizontal well construction equipment and personnel, high cost of fracturing, and low construction efficiency

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