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Method and device for judging connectivity of sand bodies between injection and production wells of low-permeability reservoir

A discrimination method and a discrimination device technology, which are applied in measurement devices, permeability/surface area analysis, suspension and porous material analysis, etc., can solve problems such as inaccurate identification of identification methods, and achieve high identification accuracy and simple and easy implementation process Good, wide range of effects

Active Publication Date: 2021-02-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method and device for discriminating the connectivity of sand bodies between injection-production wells in low-permeability reservoirs, which are used to solve the problem of inaccurate identification in existing identification methods for the connectivity of injection-production wells

Method used

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  • Method and device for judging connectivity of sand bodies between injection and production wells of low-permeability reservoir
  • Method and device for judging connectivity of sand bodies between injection and production wells of low-permeability reservoir
  • Method and device for judging connectivity of sand bodies between injection and production wells of low-permeability reservoir

Examples

Experimental program
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Effect test

Embodiment 1

[0039] The oil-bearing area of ​​Chang 3 layer of Yanchang Formation in Block B of A oilfield is 43.2km 2 , geological reserves 1479×10 4t, effective reservoir porosity distribution ranges from 8.5% to 19.10%, with an average of 12.6%; effective reservoir permeability distribution ranges from 0.15 to 18.26mD, with an average permeability of 0.76mD, belonging to low porosity and ultra-low permeability tight reservoirs. The block is developed with vertical well five-point method injection-production well pattern; affected by the connectivity between well injection and production, oil wells in different areas on the plane have great differences in effect and occurrence: in areas with higher permeability on the plane, interwell injection In areas with good production connectivity, oil wells generally have sufficient energy and high oil and liquid production, with an average of about 1.5 t / d; while in areas with low permeability, the connectivity between well groups is poor, and oi...

Embodiment 2

[0068] This example provides a method for discriminating the connectivity of sand bodies between injection and production wells in low-permeability reservoirs. The difference between this method and Method Example 1 is that only the easy-flowing water injection permeability Ky is used to conduct Filter to identify the connectivity between injection and production wells.

Embodiment 3

[0070] This example provides a method for discriminating the connectivity of sand bodies between injection and production wells in low-permeability reservoirs. The difference between this method and method embodiment 1 or 2 is only that: the water injection permeability greater than the limit Kj and less than the flowable water injection permeability is adopted. Any permeability of Ky can filter the sandstone section in the target area, and then identify the connectivity between injection and production wells.

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Abstract

The invention relates to a method and a device for judging the connectivity of sand bodies between injection and production wells of a low-permeability reservoir. The method comprises the steps of: fitting to obtain a starting pressure gradient permeability curve according to a starting pressure gradient corresponding to the core test permeability of a target region; taking a permeability value corresponding to the maximum variation amplitude of the starting pressure gradient along with the variation of the permeability on the curve as the limit water injection permeability, and taking the permeability value corresponding to the maximum curvature on the curve as the free-flow water injection permeability; and filtering a sandstone section interpreted by the target region by adopting the permeability greater than or equal to the ultimate water injection permeability and less than or equal to the free-flowing water injection permeability to obtain a longitudinal sand body connection diagram and a planar sand body distribution diagram between the injection and production wells, and judging the connectivity between the injection and production wells in the research region. According tothe method and the device, a rock core starting pressure gradient experiment is associated with the dynamic connectivity of the sand bodies between the oil-water wells of the oil reservoir, and the originally explained sandstone section is subjected to secondary filtering explanation by adopting the permeability within a certain range, so that the connectivity between a water injection well and each oil production well is quantitatively judged.

Description

technical field [0001] The invention belongs to the technical field of petroleum development, and in particular relates to a method and a device for discriminating the connectivity of sand bodies between injection and production wells in low-permeability reservoirs. Background technique [0002] my country's low-permeability reservoirs have a wide distribution area and large reserves, accounting for a large proportion of the developed reservoirs and increasing year by year. The development of low-permeability reservoirs mainly uses the method of water injection, but due to a series of problems such as high start-up pressure, complex injection-production correspondence, low water injection efficiency, unbalanced water injection displacement, long-term low production and low liquid, etc., this type of oil has been affected. Tibetan development effect. In the low-permeability unit of water injection development, because the heterogeneity of reservoir plane permeability is gene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
CPCG01N15/082Y02A10/40
Inventor 黎明王俊李岩周永强龙卫江刘宇刘峥君胡书奎王克杰贺子萧王肃安超吴可可
Owner CHINA PETROLEUM & CHEM CORP
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