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Acid fracturing test method for fracture-vug type carbonate rock test piece

A carbonate rock, acid fracturing technology, applied in the direction of applying stable tension/pressure to test material strength, measuring devices, instruments, etc., can solve problems that limit the research progress of carbonate rock acid fracturing tests

Pending Publication Date: 2021-11-16
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The natural fractures and caves contained in carbonate rocks often have strong randomness, and it is difficult to find multiple identical fracture-cavity carbonate rock salt specimens for comparative tests, which greatly limits the progress of carbonate rock acid pressure test research.

Method used

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  • Acid fracturing test method for fracture-vug type carbonate rock test piece
  • Acid fracturing test method for fracture-vug type carbonate rock test piece
  • Acid fracturing test method for fracture-vug type carbonate rock test piece

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Experimental program
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Effect test

Embodiment 1

[0132] Such as Figure 2-4, in the embodiment of the present application, the regular-shaped carbonate rock block is divided into several smaller segmented blocks 1 by means of splitting, and holes are drilled or partially knocked on the segmented plane 3 of the segmented block 1. Chisel to make artificial hole 2, so as to simulate hydrochloric acid rock salt cave. The multiple split blocks 1 are rejoined and fixed according to the initial position, and the resulting spliced ​​cracks 5 simulate natural cracks, and the gaps of the remaining spliced ​​cracks 5 are filled with slaked lime slurry to form a crack filling layer 6 mainly composed of CaCO2. formed a complete splicing of fracture-vuggy carbonate rocks. Place the fracture-cavity carbonate rock splicing body in the center of the mold, and form the cement outer shell 7 by pouring cement slurry into the remaining space of the mold, and cure for more than 7 days to form the test piece. After the cement outer shell 7 is so...

Embodiment 2

[0134] Such as Figure 5-7 , in the embodiment of the present application, the regular-shaped carbonate rock block is divided into several smaller segmented blocks 1 by means of plane cutting, and holes are drilled or partially knocked on the segmented plane 3 of the segmented block 1. Chisel to make artificial hole 2, so as to simulate hydrochloric acid rock salt cave. The multiple split blocks 1 are rejoined and fixed according to the initial position, and the resulting spliced ​​cracks 5 simulate natural cracks, and the gaps of the remaining spliced ​​cracks 5 are filled with slaked lime slurry to form a crack filling layer 6 mainly composed of CaCO2. formed a complete splicing of fracture-vuggy carbonate rocks. Place the fracture-cavity carbonate rock splicing body in the center of the mold, and form the cement outer shell 7 by pouring cement slurry into the remaining space of the mold, and cure for more than 7 days to form the test piece. After the cement outer shell 7 ...

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Abstract

The invention discloses an acid fracturing test method for a fracture-vug type carbonate rock test piece. The method comprises the following steps of: forming a fracture-vug type carbonate rock spliced body by utilizing the fracture-vug type carbonate rock test piece; forming a test sample by using the fractured-vug type carbonate rock spliced body; building an acid fracturing test system; placing the test sample in the acid fracturing test system; setting working parameters of the acid fracturing test system; and monitoring a test result of the acid fracturing test system. According to the acid fracturing test method for the fracture-vug type carbonate rock test piece, the interaction condition of an acid fracturing crack and a natural fracture-vug body can be effectively simulated, and parameter optimization is carried out on a carbonate oil and gas reservoir site acid fracturing construction process; and the acid fracturing process of the carbonate reservoir is reduced to the maximum extent, so that guidance is provided for the acid fracturing process.

Description

technical field [0001] The invention belongs to the technical field of carbonate rock oil and gas reservoir transformation, and in particular relates to an acidizing and fracturing test method for a fractured-cavity carbonate rock test piece. Background technique [0002] Acid fracturing is the most commonly used reservoir stimulation method for carbonate salt oil and gas reservoirs. This process is to inject acid liquid into the formation and open fractures under the condition of higher than the fracture pressure of the reservoir. An uneven etch is formed. After the fracturing construction is completed and the flowback is completed, the fractures will not be completely closed, and acid-etched fractures with certain flow conductivity can be formed even without proppant. Because the fractures formed by acid fracturing have high conductivity, low net pressure, small fracture height growth, etc., and will not cause problems such as screenout and proppant backflow, it is widely...

Claims

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Application Information

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IPC IPC(8): G01N3/12G01N3/02
CPCG01N3/12G01N3/02
Inventor 郭印同曾义金周再乐宋毅黄浩勇杨春和应琪祺郭武豪常鑫王磊杨涵志张晓宇毕振辉赵国凯吴小龙
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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