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Dynamic crack leaking stoppage evaluation experiment device and experiment method

An experimental device and fracture technology, which can be used in earth-moving drilling, production of fluids, wellbore/well components, etc., and can solve the problem of not being able to simulate the dynamic changes of shale fractures.

Active Publication Date: 2021-02-12
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a dynamic fracture plugging evaluation experimental device and its experimental method to solve the problem that the existing fracture plugging evaluation device cannot simulate the dynamic change of mud shale fracture shape for experiments

Method used

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  • Dynamic crack leaking stoppage evaluation experiment device and experiment method
  • Dynamic crack leaking stoppage evaluation experiment device and experiment method
  • Dynamic crack leaking stoppage evaluation experiment device and experiment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Embodiment 1 provides an experimental device for evaluating dynamic fracture plugging, and its structure will be described in detail below.

[0058] refer to figure 1 , the experimental device includes a crack simulation test instrument 1, a crack simulation test instrument fixing device 2, a liquid storage tank 3, a recovery tank 4, a hydraulic pump 5, a hand pump 6, a weighing electronic balance 7, an inlet pressure gauge 8, and an outlet pressure gauge Table 9. First back pressure valve 10 and second back pressure valve 400.

[0059] The liquid outlet of the liquid storage tank 3 is connected with the liquid inlet of the hydraulic pump 5 through a pipeline, and the liquid outlet of the hydraulic pump 5 is connected with the liquid inlet 31 of the crack simulation experiment instrument 1 through an input pipeline 310;

[0060] An inlet pressure gauge 8 is provided on the input pipeline 310;

[0061] The liquid outlet 32 ​​of the crack simulation tester 1 is connecte...

Embodiment 2

[0088] Embodiment 2 provides an experimental method for sealing cracks with a liquid medium to obtain dynamic changes in fractures. The experimental device for evaluating dynamic crack plugging in Embodiment 1 is used, and clean water or plugging slurry is used to plug cracks to promote dynamic changes in fractures to obtain dynamic changes in fractures. process method, specifically including the following steps:

[0089] Step A: Assembling the crack simulation tester 1;

[0090] Step A1: Assemble the rock mass sample 11, the fixed plate 12, two slit plates 13, multiple sets of springs 14 and sealing rubber sleeves 15 into a dynamic crack simulation mechanism;

[0091] Step A2: Put the lower plug 25, the dynamic crack simulation mechanism, and the upper plug 24 into the rubber sleeve 27 in sequence, and assemble into the crack simulation experiment apparatus 1;

[0092] Step A3: screwing the upper cover 22 and the lower cover 23 to make the rock mass sample 11 generate axial ...

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Abstract

The invention discloses a dynamic crack leaking stoppage evaluation experiment device and experiment method. The dynamic crack leaking stoppage evaluation experiment device comprises a crack simulation experiment instrument, and the crack simulation experiment instrument is provided with a dynamic crack simulation mechanism. The dynamic crack leaking stoppage evaluation experiment device can simulate the dynamic change process of cracks from closing to opening. The experiment method can be used for researching the width change range of the cracks which can be plugged in a self-adaptive mode under the matching of different leaking stoppage materials and different dosages, further can be used for quantitatively researching the influence rule of rheological parameters and hydraulic parametersof the drilling fluid on the stability of the leaking stoppage layer in the dynamic cracks, the leaking stoppage process of the dynamic cracks are simulated, and the leaking stoppage effect and leaking stoppage position in the dynamic cracks are monitored and evaluated in real time.

Description

technical field [0001] The invention relates to the technical field of petroleum engineering, in particular to a dynamic fracture plugging evaluation experimental device and an experimental method thereof. Background technique [0002] In the field of petroleum engineering, the problem of lost circulation has always been a world-class problem, which plagues oil exploration and development at home and abroad, and has not been completely resolved so far. Most drilling processes have different degrees of lost circulation. Severe lost circulation will lead to pressure drop in the well, affecting normal drilling, causing wellbore instability, inducing formation fluid to pour into the wellbore and causing blowout. Field experience shows that the success rate of plugging is less than 30%. [0003] At present, a large number of researchers have conducted research on different types of leakage problems, and have proposed various materials of leak-stopping agents and evaluated the pl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13E21B43/26E21B49/00
CPCE21B33/13E21B43/261E21B49/00G01N33/24G01N3/12G01N2203/0048G01N2203/0067G01N2203/024E21B41/00
Inventor 冯永存马成云邓金根李晓蓉罗超
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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