A Production Method of Branched Horizontal Well Based on Diffusion Coefficient

A technology of diffusion coefficient and mining method, which is applied in the fields of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of reducing the development life of gas wells and blocking shale gas flow channels, saving maintenance costs and slowing down the formation. The effect of water channeling and enhanced oil recovery

Inactive Publication Date: 2018-08-21
YANAN UNIV
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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 diffusion coefficient, which solves the existing shale gas branched horizontal well mining problem that with the prolongation of the production time, the formation water at the bottom of the horizontal well blocks the shale gas Gas flow passages, a problem that reduces the development life of gas wells

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  • A Production Method of Branched Horizontal Well Based on Diffusion Coefficient
  • A Production Method of Branched Horizontal Well Based on Diffusion Coefficient
  • A Production Method of Branched Horizontal Well Based on Diffusion Coefficient

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Embodiment Construction

[0042] The present invention provides a branched horizontal well mining method based on diffusion coefficient, which specifically includes the following steps:

[0043] Step 1: Determine the absolute core permeability k of the target reservoir 0 , core diffusion coefficient D k and the viscosity μ of shale gas g , where the core absolute permeability k 0 The core diffusion coefficient D is measured by an automatic core permeability tester. k Obtained by laboratory measurement, the viscosity μ of shale gas g Obtained by curve fitting method;

[0044] Step 2: Establish the gas-water two-phase seepage formula under the influence of diffusion coefficient:

[0045]

[0046] where k rw Indicates the relative permeability of the water phase; μ w Indicates the viscosity of the aqueous phase; Indicates the pressure gradient of the reservoir; q w Indicates the theoretical daily water production of branched horizontal wells; q g Indicates the daily gas production of branche...

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Abstract

The invention discloses a branch horizontal well mining method based on a diffusion coefficient. 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, confirming 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 method for exploiting branched horizontal wells based on diffusion coefficient. 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 productio...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/00
CPCE21B43/00
Inventor 李忠厚
Owner YANAN UNIV
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