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A Production Method of Branched Horizontal Well Based on Slip Coefficient

A technology of slippage coefficient and production method, which is applied in the direction of production fluid, earthwork drilling and production, wellbore/well components, etc., can solve the problems of reducing the development life of gas wells and blocking the flow channel of shale gas, so as to save maintenance costs and slow down formation The effect of water channeling and high efficiency

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 the slippage coefficient, 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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  • A Production Method of Branched Horizontal Well Based on Slip Coefficient
  • A Production Method of Branched Horizontal Well Based on Slip Coefficient
  • A Production Method of Branched Horizontal Well Based on Slip Coefficient

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Embodiment Construction

[0042] A kind of branch horizontal well mining method based on slippage coefficient of the present invention, specifically comprises the following steps:

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

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

[0045]

[0046] where k rwIndicates 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 branched horizontal wells; k rg Indicates the relative permeability of shale gas; k B Indicates the Boltzmann...

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Abstract

The invention discloses a branch horizontal well recovery method based on slippage coefficients. The branch horizontal well recovery method specifically comprises the following steps that first, a theoretical value of shale gas output of a branch horizontal well is calculated; and second, production of actual daily output of the branch horizontal well is conducted according to the theoretical value, a graph of the actual daily output of the branch horizontal well and time is drawn, the actual daily output of the branch horizontal well is adjusted to a stop jump point from occurring until no jump point occurs when the jump point occurs on the graph, and the branch horizontal well is scrapped when accumulated water output is equal to critical water output. According to the branch horizontal well recovery method based on the slippage coefficients, adjustment is conducted after the jump point is generated, carrying of production water in the branch horizontal well through the shale gas in time is facilitated, the damage that an air-water mixture returns to the well bottom is reduced, gathering of the production water at the well bottom is reduced, and thus the maintenance charge is reduced, efficiency is high, and maintenance cost is reduced.

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 slippage 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 production...

Claims

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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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