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Erosion evaluation device and test method for proppant sand balls in discontinuous sanding cracks

A technology for evaluating devices and proppants, which is used in measuring devices, testing wear resistance, earthwork drilling, etc. The fluidization phenomenon is studied, and the stability changes of the proppant sand column cannot be simulated, so as to achieve the effect of an effective test method, a simple structure and a reliable principle.

Active Publication Date: 2016-04-20
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. The influence of fluid erosion in discontinuous sand-laying fractures on the porosity ratio of propped fractures cannot be investigated;
[0006] 2. The influence of fracture wall roughness on the erosion stability of proppant sand columns in discontinuous sand-laying fractures is not considered;
[0007] 3. It is impossible to study the fluidization phenomenon of the particles at the edge of the proppant sand column in the discontinuous sand-laying fracture under the condition of different flow rates;
[0008] 4. It is impossible to simulate the stability change of proppant sand column in discontinuous sand-laying fractures under the dual effects of formation closure pressure and fluid erosion

Method used

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  • Erosion evaluation device and test method for proppant sand balls in discontinuous sanding cracks
  • Erosion evaluation device and test method for proppant sand balls in discontinuous sanding cracks
  • Erosion evaluation device and test method for proppant sand balls in discontinuous sanding cracks

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Refer to the attached figure 1 , 2 And 3, as the best implementation mode of this device is:

[0041] According to the designed porosity ratio of discontinuous sand-laying fractures, the required proppant quality is:

[0042]

[0043] In the formula:

[0044] m p — mass of proppant required for the experiment, g; S —Simulated fracture area, m 2 ; 0 —Initial channel ratio of discontinuous sand-laying fractures; C p —Sand concentration of single column proppant sand column, kg / m 2 .

[0045] According to the moment balance equation, the critical fluidization velocity of the particles at the edge of the proppant sand column can be obtained:

[0046]

[0047] In the formula:

[0048] v —Critical fluidization velocity of particles at the edge of sand column, m / s; d s —proppant diameter, m; g —gravitational acceleration, m 2 / s; ρ s —proppant density, kg / m 3 ; ρ—Experimental fluid density, kg / m 3 ; ε —cohesion coefficient, 0.00256Pa.m; γ—fibe...

Embodiment 2

[0054] The test method using the above test device is as follows:

[0055] (1) Weigh 0.294kg of proppant particles required for the experimental test, and configure the test fluid for the experiment; (2) Use the proppant sand column mold to make the proppant sand column, under the condition of the designed fracture porosity

[0056] Paving in the erosion zone 8 proppant sand column laying area to form discontinuous propping cracks;

[0057] (3) Load the upper (lower) piston 17 (18) in the erosion area 8, install the liquid inlet joint 25 and the liquid outlet joint 26, and load the hydraulic machine 12 to the initial closing pressure of 6.9MPa;

[0058] (4) Simulate the erosion process of flowback fluid after pressure, close the valve 4 of the gas storage tank, open the valve 1 of the liquid storage tank and the valve 3 of the liquid storage tank, and turn on the constant flow pump 5 to displace with the lowest displacement, so that the experimental test process pipeline and ...

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Abstract

The invention relates to a test device and method for simulating edge particle fluidizing of proppant sand columns and in-crack passrate variation in the pulsed sand post-fracturing flowback and production process. The test device mainly comprises a liquid storage tank, a gas storage tank, a constant-flow pump, a pipeline heating jacket, a flowmeter, an erosion area, a displacement sensor, a hydraulic press, a sand grain collector, a waste liquor tank, a data acquisition control panel and a computer. The device and the method can simulate real conditions of closing pressure exertion on and fluid erosion of proppant sand columns in post-fracturing discontinuous sanding cracks under the pulsed sand fracturing condition, and meets the test requirements of fracturing and erosion of proppant sand columns in the discontinuous sanding cracks under different test conditions.

Description

technical field [0001] The invention relates to a test device and method for fluidization of particles at the edge of a proppant sand column and the change of porosity ratio in a fracture during flowback after pulse type sand adding fracturing and production process. Background technique [0002] Pulse hydraulic sand fracturing, as an emerging technical means in the field of oil and gas reservoir stimulation and stimulation, has been gradually popularized and applied all over the world. This technology provides technical support for the efficient development of oil and gas wells after fracturing by forming discontinuous sand-laying fractures, improving the porosity and fluid flow efficiency in the fractures. However, affected by factors such as formation closure pressure, fluid velocity, propped fracture width, and proppant particle properties, local fluidization will occur at the edge of the proppant sand column during the flowback process after fracturing and during the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/56E21B43/267
CPCE21B43/267G01N3/565G01N2203/001
Inventor 陈星宇尹丛彬朱炬辉肖剑锋何封王素兵
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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