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Apparatus and method for testing acid-etched crack diversion capability

A technology of conductivity and acid-etched fractures, which is applied in the field of fracturing and acidification of oil and gas wells, can solve the problems of poor simulation experiment accuracy, limited influencing conditions, and inability to simulate the change process of conductivity in acid fracturing well, and achieve The effect of improving accuracy

Active Publication Date: 2016-03-09
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the existing acid-etched fracture conductivity simulation test method, the conditions involved in affecting the acid-etched fracture conductivity are limited, and cannot well simulate the change process of the actual on-site acid fracturing construction conductivity. poor accuracy

Method used

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  • Apparatus and method for testing acid-etched crack diversion capability
  • Apparatus and method for testing acid-etched crack diversion capability

Examples

Experimental program
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Effect test

Embodiment 1

[0034] see figure 1 , the embodiment of the present invention provides a device for testing the conductivity of acid-etched fractures, the device includes a constant flow pump 1 connected in series using pipelines, a liquid storage tank 2, a plate holder 3 for clamping rock slabs, Flow meter 4, the first back pressure valve 5a and the first waste liquid tank 6a, the device also includes the first multi-way pipe 7a, the second multi-way pipe 7b, circulation pump 8, the first multi-way pipe 7a and the second multi-way The through pipes 7b have a plurality of ports respectively, and three of the ports of the first multi-way pipe 7a are respectively connected to the liquid outlet of the liquid storage tank 2, the liquid inlet of the plate holder 3 and the liquid outlet of the circulation pump 8 , three of the ports of the second multi-way pipe fitting 7b are respectively connected to the liquid outlet of the plate holder 3, the liquid inlet of the first back pressure valve 5a and ...

Embodiment 2

[0053] see figure 2 , the embodiment of the present invention also provides a method for testing the conductivity of acid-etched fractures, which is suitable for testing with the device described in Example 1, and the method includes the following steps:

[0054] S1: Clamp the rock plate on the plate holder 3, and control the constant flow pump 1 to drive the liquid storage tank 2 to discharge a certain amount of acid liquid.

[0055] Specifically, distilled water at room temperature is stored in the constant flow pump 1, and the constant flow pump 1 will drive the distilled water into the bottom of the piston of the liquid storage tank 2, and displace the piston of the liquid storage tank 2 to move upward, so that the acid liquid on the upper part of the piston of the liquid storage tank 2 into the pipeline.

[0056] Further, when it is necessary to simulate the influence of the foam acid system on the flow conductivity, when implementing step S1 to control the constant flo...

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Abstract

The present invention discloses an apparatus for testing acid-etched crack diversion capability, and relates to the technical field of oil and gas well fracturing acidizing. The apparatus comprises a constant flow pump, a liquid storage tank, a flat plate clamper, a flow meter, a first back pressure valve and a first waste liquid tank, and further comprises a first multi-way pipe member, a second multi-way pipe member and a circulation pump, wherein the constant flow pump, the liquid storage tank, the flat plate clamper, the flow meter, the first back pressure valve and the first waste liquid tank are sequentially connected in series by using pipelines, the first multi-way pipe member and the second multi-way pipe member are respectively provided with a plurality of communication ports, three of the communication ports of the first multi-way pipe member are respectively connected to the liquid outlet of the liquid storage tank, the liquid inlet of the flat plate clamper, and the liquid outlet of the circulation pump, three of the communication ports of the second multi-way pipe member are respectively connected to the liquid outlet of the flat plate clamper, the liquid inlet of the first back pressure valve, and the liquid inlet of the circulation pump, and a sampling port is arranged on the pipeline between the flat plate clamper and the second multi-way pipe member. According to the present invention, the acid liquid reflux line having the circulation pump is arranged, such that the influence of the acid liquids under different concentrations, different reaction products and different contents on the diversion capability can be simulated so as to accurately simulate the diversion capability change process.

Description

technical field [0001] The invention relates to the technical field of fracturing and acidizing oil and gas wells, in particular to a device and method for testing the conductivity of acid-etched fractures. Background technique [0002] Fracturing and acidizing is an important technology for stimulation of carbonate oil and gas reservoirs. During acid fracturing, acid liquid is injected into fractures to etch the fracture walls non-uniformly. After construction, the fractures are gradually closed. The unevenness forms support fractures with diversion capacity, which improves oil and gas seepage capacity and increases the production of oil and gas wells. The conductivity of fractures is directly related to the effect of acid fracturing. The key factors affecting the conductivity of acid-etched fractures are mainly the amount of acid solution and the form of acid etching on fractures. These two factors are mainly affected by the physical properties of formation rocks, Rock st...

Claims

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Application Information

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IPC IPC(8): G01N33/00
Inventor 王道成张燕孙川向超王川龙顺敏原励陈礼利谢羽
Owner PETROCHINA CO LTD