Unlock instant, AI-driven research and patent intelligence for your innovation.

A method and device for obtaining comprehensive reservoir damage during water injection

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

Active Publication Date: 2018-03-09
PETROCHINA CO LTD
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method and device for obtaining comprehensive reservoir damage during water injection
  • A method and device for obtaining comprehensive reservoir damage during water injection
  • A method and device for obtaining comprehensive reservoir damage during water injection

Examples

Experimental program
Comparison scheme
Effect test

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]

[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 flow rate of water absorption, 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 damage, clogging and pollution by machine debris, and the reduction of displacement pressure difference △P due to the increase of reservoir pressure and low water injection pressure will a...

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method and device for obtaining comprehensive reservoir damage during water injection, which includes: obtaining the wellhead injection pressure and daily water injection volume of a water well within a time period; according to the wellhead injection pressure and the daily water injection volume , calculate and obtain the apparent water absorption index of the water well; obtain the linear relationship between the apparent water absorption index and the wellhead injection pressure at different stages within the time period; obtain the reservoir in the water injection process according to the linear coefficient of the linear relationship at different stages Changes in combined damage. Through the above technical solution, the technical problem that the comprehensive damage change of the reservoir cannot be judged in the prior art is solved, and technical guidance is provided for water injection well injection measures to reduce the degree of damage and improve the water injection capacity.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00
Inventor 宋友贵赵广天杨静
Owner PETROCHINA CO LTD