Acid distribution method based on distribution characteristics of horizontal well skin factors

A technology of skin coefficient and distribution characteristics, which is applied in earthwork drilling, wellbore/well components, production fluids, etc., can solve the problems of poor acidizing effect and low acidizing efficiency, and achieve the goal of improving the utilization rate of acid liquid and improving the acidizing effect Effect

Inactive Publication Date: 2019-01-04
CHENGDU NORTH OIL EXPLORATION DEV TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide an acid distribution method based on the distribution characteristics of the skin factor o

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  • Acid distribution method based on distribution characteristics of horizontal well skin factors
  • Acid distribution method based on distribution characteristics of horizontal well skin factors
  • Acid distribution method based on distribution characteristics of horizontal well skin factors

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Embodiment 1

[0085] Such as Figure 1 to Figure 7 As shown, an acid distribution method based on the distribution characteristics of horizontal well skin factor includes the following steps:

[0086] 1), establish a single-well geological model under initial conditions, the single-well geological model is a grid system established under polar coordinates, assign the reservoir permeability and porosity attributes obtained by logging interpretation to the network by the following method grid system:

[0087] The assignment model of porosity in the grid system:

[0088] φ(r,θ,z,t 0 ) = φ 0 (z)+φ 0 (z)γG(r,θ,z,t 0 ) (1)

[0089] The value assignment model of permeability in the grid system:

[0090] K(r,θ,z,t 0 )=K 0 (z)+K 0 (z)γG(r,θ,z,t 0 ) (2)

[0091] In the formula, is the porosity (dimensionless) at different positions in the polar coordinate grid system at the initial moment, where r is the radial direction of the borehole of the horizontal well, θ is the circumferential d...

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Abstract

The invention discloses an acid distribution method based on the distribution characteristics of horizontal well skin factors. The acid distribution method comprises the following steps that (1), a single well geological model is established under initial conditions; (2), a single well geological model after drilling damage is calculated based on the single well geological model constructed in thestep (1); (3), based on the single well geological model constructed in the step (1), a horizontal well liquid production section before the drilling damage is calculated; (4), based on the single well geological model after the drilling damage calculated and obtained in the step (2), a horizontal well liquid production section after the drilling damage is calculated; (5), according to the horizontal well liquid production section before the drilling damage obtained in the step (3) and the horizontal well liquid production section after the drilling damage obtained in the step (4), the skin factors at different positions along an entire horizontal well section are calculated; and (6), the amount of acid distribution at different positions of a horizontal well is calculated according to the distribution characteristics of the skin factors along the horizontal well section. The acid distribution method solves the problems of low acidification efficiency and poor acidification effect caused by existing blind acid distribution.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to an acid distribution method based on the distribution characteristics of the skin coefficient of a horizontal well. Background technique [0002] The characteristics of the wellbore structure of the horizontal well greatly increase the drainage area of ​​the oil layer, which has incomparable advantages over the vertical well. However, it also faces engineering and technical problems such as strong reservoir heterogeneity, large pollution differences in different well sections, and inability to maximize production capacity. [0003] Acidizing measures are an effective means to decontaminate, give full play to the potential of horizontal wells, and realize rapid production establishment. However, because the horizontal well section is generally long, the existing methods such as well testing, dynamic analysis, and logging interpretation cannot obtain the dist...

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Application Information

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IPC IPC(8): E21B43/22
CPCE21B43/16
Inventor 薛衡黄祖熹卢立泽王贺华李鑫蒋利平刘榧成一臧克一张博周长江岑玉达肖勇赵星孙照磊万丽娟程洋黄海平黄凯黄进腊桂碧雯
Owner CHENGDU NORTH OIL EXPLORATION DEV TECH
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