Method and apparatus for acquiring reservoir comprehensive damage during water injection process

A technology of comprehensive damage and reservoir, applied in the direction of earthwork drilling and production, wellbore/well components, etc., can solve the problem of inability to judge the change of comprehensive damage of reservoir, achieve the effect of improving water injection capacity and reducing the degree of damage

Active Publication Date: 2016-02-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The embodiment of the present invention provides a method and device for obtaining comprehensive reservoir damage during water injection, which is used to solve the technical problem in the prior art that the change of comprehensive reservoir damage cannot be judged

Method used

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  • Method and apparatus for acquiring reservoir comprehensive damage during water injection process
  • Method and apparatus for acquiring reservoir comprehensive damage during water injection process
  • Method and apparatus for acquiring reservoir comprehensive damage during water injection process

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Experimental program
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Embodiment 1

[0036] Firstly, the definition of reservoir comprehensive damage is explained

[0037] According to Darcy's seepage formula, it can be known that:

[0038] Q = K · Δ P μ · A L

[0039] In the formula, A represents the area of ​​the core end, in cm 2 ; L is the core length, in cm; K is the core permeability, in D; μ is the fluid viscosity, in mPa.s; △P is the displacement pressure difference, in 10 -1 MPa; Q represents the water absorption flow rate, the unit is cm 3 / s.

[0040] Under the conditions of effective reservoir thickness, injection-production well spacing and injected water, etc., the water injection capacity (water absorption capacity) Q changes with the change of displacement pressure difference △P and permeability K. When the reservoir sensitivity The reduction of permeability K caused by da...

Embodiment 2

[0063] Please refer to Figure 6 , the embodiment of the present application also provides a device for obtaining comprehensive reservoir damage during water injection, the device comprising:

[0064] An acquisition module 601, configured to acquire the wellhead injection pressure and daily water injection volume of the water well within a period of time;

[0065] Calculation module 602, used to calculate and obtain the apparent water absorption index of the water well according to the wellhead injection pressure and the daily water injection volume;

[0066] A fitting module 603, configured to obtain a linear relationship between the apparent water absorption index and the wellhead injection pressure at different stages within the time period;

[0067] The comparison module 604 is used to obtain the change of the comprehensive damage of the reservoir during the water injection process according to the linear coefficient of the linear relationship at different stages.

[006...

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Abstract

The invention discloses a method and apparatus for acquiring reservoir comprehensive damage during a water injection process. The method comprises following steps: acquiring the wellhead injection pressure and daily water injection amount of a well in a time period; calculating apparent injectivity indexes of the well according to the wellhead injection pressure and daily water injection amount; acquiring linear relations of the apparent injectivity indexes and the wellhead injection pressure at different stages of the time period; and acquiring the change of the reservoir comprehensive damage during the water injection process according to linear coefficients of the linear relations at the different stages. According to the technical scheme mentioned above, a technical problem in the prior art that the change of the reservoir comprehensive damage cannot be determined is solved, and technical guidance is provided for intensified injection measures for water injection wells, so that the damage degree can be reduced, and the water injection capability is enhanced.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a method and a device for obtaining comprehensive damage of reservoirs during water injection. Background technique [0002] After long-term water injection development in the oil field, the injected water has changed the physical properties, rock-electric properties and oil-water dynamic distribution of the reservoir. By studying the damage mechanism and change characteristics of the injected water to the reservoir, it is necessary to study the change of reservoir heterogeneity after water injection. characteristics, distribution of remaining oil and preliminary work for tertiary oil recovery. [0003] At present, the research on the damage mechanism of some oilfield reservoirs in the process of water injection related to this technology is based on the indoor evaluation of single-factor damage, and each damage factor is analyzed separately, while the actual reser...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
Inventor 宋友贵赵广天杨静
Owner PETROCHINA CO LTD
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