Optimization Study of the Horizontal Well and Injection-production Pattern in an Ultra-low-permeability Reservoir

doi:10.11885/j.issn.1674-5086.2017.03.22.03

Abstract

Abstract: This study forms the basic principle of an injection-production well design for a horizontal well in an ultra-lowpermeable reservoir based on the understanding of the breakthrough, effect analysis, and mining rule of the horizontal well in an ultra-low-permeable reservoir to solve the problem of stable production. The following points are discussed:(1) the expanding range of the three-dimensional space of an artificial pressure crack is the foundation of the injection-production pattern design; (2) the direction of the well arrangement is perpendicular to the maximum principal stress; (3) the lateral displacement of the well network is the main supplementary energy; (4) the well spacing, distance, and horizontal section length should be optimized to improve the water flooding control area ratio; and (5) spacing must be reduced and an effective use of the gap between the reserves must be realized to improve the intensity of the single section. The technical direction and policy of further improving the development effect of horizontal wells are put forward based on the basic principles of the injection-production well pattern design along with the combination of field statistics and theoretical analysis to (1) improve the level of the single segment output; (2) improve the level of the well network pressure and optimize the well spacing for 500-600 m (the horizontal segment lengths of the reservoirs of the I, Ⅱ, and Ⅲ classes were 500-550 m, 450-500 m, and 400-450 m, respectively, and the reservoir row spacings of the I, Ⅱ, and Ⅲ classes were 150, 120~130, and 100~120 m, respectively; (3) optimize the water injection intensity of the single well using the technique of low and moderate water injection; and (4) determine the reasonable initial output of the horizontal well using the relationship between the amount of deposit, distance, and velocity of the water line. The reasonable production flow pressure injection was slightly greater than the saturation pressure before the water injection was effective, and was not less than 2/3 of the saturated pressure.

Key words: ultra-low permeability, horizontal well, evaluation method of effective degree, injection-production pattern, optimization adjustment, adaptability

CLC Number:

TE348

FAN Jianming, QU Xuefeng, WANG Chong, ZHANG Qingzhou, WANG Xuanru. Optimization Study of the Horizontal Well and Injection-production Pattern in an Ultra-low-permeability Reservoir[J]. 西南石油大学学报(自然科学版), 2018, 40(2): 115-128.

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