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Calculation Method of Inhomogeneous Damage Depth in Sandstone Reservoir

A calculation method, non-uniform technology, applied in earthwork drilling, measurement, borehole/well components, etc.

Active Publication Date: 2016-09-07
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Currently, the usual to calculate the damage depth of the reservoir, but this formula assumes that the reservoir is uniformly damaged, that is, the permeability in the damaged area is constant

Method used

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  • Calculation Method of Inhomogeneous Damage Depth in Sandstone Reservoir
  • Calculation Method of Inhomogeneous Damage Depth in Sandstone Reservoir
  • Calculation Method of Inhomogeneous Damage Depth in Sandstone Reservoir

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Effect test

Embodiment Construction

[0075] The present invention will be further described below by way of examples.

[0076] Evaluation of the damage depth and oil and gas layer protection effect of the 5726.00-5746.00m well section of Well DH1.

[0077] Well DH1 is a prospecting well. The 5726.00-5746.00m section of the well was completed and tested, and the casing was set. The test horizon is Carboniferous.

[0078] (1) Input data

[0079] 1) Well parameters

[0080] well name

Well DH1

Well section

5726.00-5746.00m

Well type

perforated well

Wellbore Radius

0.076

Two-phase zone outer radius

0.076

total skin factor

12.64

Ratio of single-phase to two-phase permeability

1

[0081] 2) Boundary parameters

[0082] boundary type

Borderless

[0083] 3) Formation parameters

[0084] Formation properties

anisotropy

Porosity

0.15

geometry factor

31.62

Formation thickness (m)

20

...

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Abstract

The invention relates to a method for calculating the nonuniform damage depth of a sandstone reservoir, and belongs to the technical field of oil gas exploration and development reservoir protection. The method is characterized by comprising the following concrete steps that (1) well body parameters, boundary parameters, stratum parameters, fluid parameters, jet hole parameters and production parameters are collected; (2) a total skin factor S is decomposed to obtain a stratum damage skin factor Sd; (3) the initial value of the ratio (k / kw) of a given stratum permeability k to a well wall permeability kw is set; (4) an equation shown in the accompanying drawing is solved by a Newton iteration method, and the stratum damage depth is obtained according to a formula that ls=rs-rw. The method provided by the invention can be used for calculating the damage depth of the nonuniform damage of the sandstone reservoir, so the method better conforms to the practical use condition and has important significance on the reservoir protection effect evaluation.

Description

Technical field: [0001] The invention relates to a method for calculating the non-uniform damage depth of a sandstone reservoir, which belongs to the technical field of oil and gas exploration and development reservoir protection. Background technique: [0002] In the process of oil and gas exploration and development, reservoir damage refers to the increase of flow resistance or the decrease of flow velocity of fluid flowing out or injected near the wellbore zone, so that the reservoir cannot reach the predetermined production or injection volume. The core problem of reservoir damage is that due to the poor properties of drilling fluid, completion fluid, workover fluid, etc., improper use changes the rock structure and surface properties of the reservoir, and even causes changes in wettability and fluid phase state; Or due to the chemical reaction between the filtrate of various working fluids and the fluid in the reservoir, the precipitation and accumulation of various sca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00E21B47/00E21B47/04
Inventor 王新海张福祥李公让孙玉刘洪
Owner BC P INC CHINA NAT PETROLEUM CORP
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