A Production Method of Branched Horizontal Well Based on Green's Function

Abstract

The invention discloses a branch horizontal well exploitation method based on the Green's function. The branch horizontal well exploitation method based on the Green's function specifically includes the following steps that firstly, a theoretical value of the shale gas yield of a branch horizontal well is calculated; secondly, according to the theoretical value, production at the daily practical yield of the branch horizontal well is conducted, and a curve chart of the daily practical yield of the branch horizontal well and time is drawn; when a jump point occurs in the curve chart, the daily practical yield of the branch horizontal well is adjusted until no jump point occurs in the curve chart; and when the accumulated water yield is equal to the critical water yield, the branch horizontal well is scrapped. According to the branch horizontal well exploitation method based on the Green's function, adjustment is carried out after the jump point occurs, so that shale gas better carries produced water in a horizontal well shaft in time, the danger that a gas-water mixture returns to the well bottom is reduced, and gathering of the produced water at the well bottom is reduced; and accordingly, maintenance cost is lowered, and efficiency is high.

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 Green's function. 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 production method...

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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 Green's function, which solves the existing shale gas branched horizontal well development problem that the formation water at the bottom of the horizontal well blocks the shale gas with the prolongation of the production time. Gas flow passages, a problem that reduces the development life of gas wells

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