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Shale base block dynamic damage evaluation device and method based on liquid pressure pulse

A technology of liquid pressure and evaluation device, applied in measurement devices, analysis of suspensions and porous materials, instruments, etc.

Inactive Publication Date: 2016-09-28
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the permeability of the shale matrix is ​​extremely low. Even if the liquid permeability is generally less than 0.01mD under undamaged conditions, the conventional steady-state displacement method requires a large pressure difference and takes a long time to test the liquid permeability of the matrix. even hard to succeed
After the working fluid is damaged, the permeability of the test core is further reduced, and the steady-state displacement method is usually difficult to measure the effective permeability value, which leads to the failure to carry out the damage evaluation smoothly
Moreover, the existing damage testing method is usually to test the core displacement experiment under the pressure difference condition, which is different from the actual drilling, completion and fracturing process, in which the working fluid flows along the wellbore / fracture while invading into the base block. There are certain differences

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  • Shale base block dynamic damage evaluation device and method based on liquid pressure pulse

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Embodiment 1

[0042] Such as figure 1 As shown, this embodiment discloses a dynamic damage evaluation device for shale foundation blocks based on liquid pressure pulses, which is used to evaluate the hydraulic permeability of 10 -6 ~10 -2 The dynamic damage degree of the working fluid of tight cores such as shale base blocks in mD mainly includes the upstream standard chamber 9, the downstream standard chamber 14, the core holder 5, the confining pressure pump 4, the vacuum pump 12, the constant pressure and constant flow pump 2, the intermediate Container 1, pressure sensors 7 and 11, thermostatic system 6. Wherein the inlet end of the core holder 5 is connected with the upstream standard chamber 9, and the outlet end is connected with the downstream standard chamber 14; an upstream standard chamber inlet control valve 3 is arranged between the upstream standard chamber 9 and the constant pressure constant flow pump 2, and the middle An upstream standard chamber outlet control valve 8 is...

Embodiment 2

[0049] This embodiment is based on the dynamic damage evaluation method of the shale foundation block based on the liquid pressure pulse. The above-mentioned device is used to evaluate the evaluation method of the dynamic damage degree of the working fluid to the shale foundation block. This method is used to evaluate the hydraulic permeability of 10 -6 ~10 -2 The working fluid dynamic damage degree of tight rock cores such as the shale base block of mD, the rock sample of the embodiment is the shale base block core L-1 of the Longmaxi Formation in the Sichuan Basin (micro-cracks are invisible to the naked eye), and the specific steps are as follows:

[0050] Step 1. Drill the core L-1 of the shale base block of the Longmaxi Formation. The measured diameter is 38.1mm and the thickness is 10.2mm, and it is dried at 80°C for 48 hours;

[0051] Step 2, put a steel rock core (permeability zero) with a diameter of 38.0mm and a thickness of 10.0mm into the core holder 5, and feed he...

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Abstract

The invention discloses a shale base block dynamic damage evaluation device and method based on a liquid pressure pulse. The device comprises an upstream standard room, a downstream standard room, a rock core clamping device, a confining pressure pump, a vacuum pump, a constant-pressure and constant-flow pump, a middle container, a pressure sensor, a constant-temperature system and the like; a damage experiment is performed under high-temperature and high-pressure conditions, and a dynamic damage process on a shale base block by working fluid in drilling and completion and cracking processes is simulated; and by monitoring the difference of a pulse attenuation curve of a rock to be detected by standard saline water before and after dynamic damages, the permeability of rock core fluid before and after the dynamic damages is calculated by utilizing a liquid pressure pulse model, so that the evaluation of a dynamic damage degree of the shale base block by the working fluid is realized. The completion of the working fluid damage evaluation method system of the drilling and completion and cracking processes of shale gas can be facilitated, and technical supports are provided for preferring and optimization of a working fluid formula, so that the shale base block dynamic damage evaluation device and method have certain popularization prospects.

Description

technical field [0001] The invention relates to the field of tight oil and gas reservoir damage and performance evaluation of working fluid, and is an evaluation device and method for simulating the process of dynamic invasion and damage of shale base blocks by working fluid in drilling, completion and fracturing of shale gas reservoirs. Background technique [0002] In order to meet the world economy's demand for energy, especially for clean energy, oil and gas exploration and development are gradually moving towards shale gas resources, and major breakthroughs have been made in recent years. Compared with conventional natural gas reservoirs, shale gas reservoirs are dense in lithology, and the shale base blocks (micro-cracks invisible to the naked eye) are dominated by nanoscale pores. At the same time, the reservoirs have high clay mineral content and ultra-low water saturation feature. During drilling, completion and fracturing, working fluids (drilling fluid, cementing...

Claims

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/08G01N15/0826
Inventor 李相臣杨斌康毅力陈一健白佳佳陈益滨闫霄鹏张敬逸
Owner SOUTHWEST PETROLEUM UNIV
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