A kind of branch horizontal well production method based on starting pressure gradient

Abstract

The invention discloses a branch horizontal well mining method based on a starting pressure gradient. The branch horizontal well mining method comprises the following steps: firstly, calculating the theoretical value of the shale gas yield in a branch horizontal well; according to the theoretical value, carrying out the actual production of the branch horizontal well, and drawing a curve graph of the actual daily yield and time of the branch horizontal well; when a jump point occurs in the curve graph, adjusting the production until the jump point does not appear in the curve graph; when accumulated water yield is equal to critical water yield, determining that the branch horizontal well is scrapped. According to the branch horizontal well mining method, by adjusting the production when the jump point occurs, the output water in the horizontal wellbore can be timely carried by shale gas, the harm of the gas and water mixture returning to the bottom of the well is thus reduced and the gathering of the output water on the bottom of the well is reduced, therefore, maintenance charge is reduced, efficiency is high and maintenance cost is saved.

Description

technical field [0001] The invention belongs to the technical field of shale gas exploitation operations, and relates to a branched horizontal well exploitation method based on a start-up pressure gradient. Background technique [0002] In shale gas development, drilling branch wells on the basis of horizontal wells can increase the length of the target layer, increase the oil drainage area, and increase oil and gas production. The technology is developing rapidly and has entered the stage of large-scale application. At present, branched horizontal well technology is an effective means of exploiting shale gas reservoirs. In the exploitation of shale gas wells, in order to obtain the maximum cumulative production, generally, one method is to control the pressure at the bottom of the horizontal well of the gas well, and the other method is to control the wellhead flow rate of the gas well to be constant. [0003] However, the existing shale gas branched horizontal well produ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a branched horizontal well mining method based on the start-up pressure gradient, which solves the problem that existing shale gas branched horizontal wells are exploited, and the formation water at the bottom of the horizontal well blocks the shale gas with the prolongation of the production time. The problem of gas flow passages that reduce the development life of gas wells

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