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A Production Method of Branched Horizontal Well Based on Fractal Dimension

A fractal dimension and mining method technology, applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve the problems of reducing the development life of gas wells, blocking shale gas flow channels, etc., to save maintenance costs, reduce The effect of formation water channeling and reducing the harm of returning to the bottom of the well

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 fractal dimension, which solves the problem that existing shale gas branched horizontal wells are exploited. The problem of gas flow passages that reduce the development life of gas wells

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  • A Production Method of Branched Horizontal Well Based on Fractal Dimension
  • A Production Method of Branched Horizontal Well Based on Fractal Dimension
  • A Production Method of Branched Horizontal Well Based on Fractal Dimension

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Embodiment Construction

[0044] A branched horizontal well mining method based on fractal dimension of the present invention, specifically comprises the following steps:

[0045] Step 1: Determine the absolute core permeability k of the target reservoir 0 and the viscosity μ of shale gas 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;

[0046] Step 2: Establish the gas-water two-phase seepage formula under the influence of fractal dimension:

[0047]

[0048] in,

[0049] 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 branched horizontal wells; k rg Indicates the relative permeability of shale gas; p indicates the pressure at any positi...

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Abstract

The invention discloses a branch horizontal well exploitation method based on fractal dimension. The method is implemented in the specific steps that firstly, the theoretical value of the shale gas yield of a branch horizontal well is calculated; secondly, according to the theoretical value, the branch horizontal well goes into operation according to daily actual yield, a curve chart of the daily actual yield and time of the branch horizontal well is drawn, when trip points appear in the curve chart, the curve chart is adjusted till no trip points appear in the curve chart, and when cumulative water yield is equal to critical water yield, the branch horizontal well is scrapped. Adjustment is conducted after trip points are generated, shale gas can conveniently carry produced water in a horizontal well shaft, damage caused when gas and water mixtures go back to the well bottom is reduced, and accumulation of the produced water at the well bottom is reduced, so that maintenance expenses are 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 fractal dimension. 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 metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/00E21B43/12
CPCE21B43/12E21B43/121
Inventor 李忠厚
Owner YANAN UNIV
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