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Crack simulation mechanism, crack simulation experiment instrument and leaking stoppage evaluation experiment device

A simulation experiment and gap technology, which is used in surveying, wellbore/well components, earthwork drilling, etc., can solve the problem of inability to dynamically simulate the morphological changes of shale fractures, and achieve the effect of monitoring and evaluating the effect of plugging

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 crack simulation mechanism, a crack simulation experiment instrument and a plugging evaluation experimental device, which is used to solve the problem that the existing crack plugging evaluation device cannot dynamically simulate the shape change of mud shale cracks

Method used

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  • Crack simulation mechanism, crack simulation experiment instrument and leaking stoppage evaluation experiment device
  • Crack simulation mechanism, crack simulation experiment instrument and leaking stoppage evaluation experiment device
  • Crack simulation mechanism, crack simulation experiment instrument and leaking stoppage evaluation experiment device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 provides a gap simulation mechanism, and its structure will be described in detail below.

[0029] refer to figure 1 , the crack simulation mechanism can realize dynamic simulation of shale crack shape change, including rock mass sample 11, fixed plate 12, two crack plates 13, multiple sets of springs 14 and sealing rubber sleeve 15.

[0030] Among them, the rock mass sample 11 is a mud shale sample, and a hollow groove 16 is arranged inside, and a liquid inlet channel 17 of a gap simulation mechanism is communicated above the hollow groove 16;

[0031] The fixing plate 12 is fixed on the side wall and the bottom of the hollow groove 16;

[0032] The two slit plates 13 are arranged symmetrically about the center line of the hollow groove 16, the bottoms of the two slit plates 13 are pivotally connected to the fixed plate 12 at the bottom of the hollow groove 16, and the tops of the two slit plates 13 touch the top of the hollow groove 16 On the surface, w...

Embodiment 2

[0040] Embodiment 2 provides a crack simulation tester, the crack simulation tester is installed with the crack simulation mechanism of embodiment 1, and its structure will be described in detail below.

[0041] refer to Figure 3 to Figure 8 , the crack simulation tester 1 includes a cylinder 21 , an upper cover 22 , a lower cover 23 , an upper plug 24 , a lower plug 25 , a pressure head 26 , a rubber sleeve 27 and a sealing ring 28 .

[0042] The upper cover 22 and the lower cover 23 are arranged on the top and the bottom of the cylinder 21 respectively, and the upper plug 24 and the lower plug 25 are inside the cylinder 21 and are closely attached to the upper cover 22 and the lower cover 23 respectively. The plug 24, the lower plug 25 and the cylinder 21 together form a storage cavity 20, the geometric dimensions of the storage cavity 20 can just accommodate the rock mass sample 11, and the gap simulation mechanism is installed in the storage cavity 20 Inside;

[0043] The...

Embodiment 3

[0055] Embodiment 3 provides an experimental device for plugging evaluation, including the crack simulation experimental instrument of Embodiment 2, and its structure will be described in detail below.

[0056] refer to Figure 9 and Figure 10 , the experimental device also includes a liquid storage tank 3, a recovery tank 4, a hydraulic pump 5, a hand pump 6, a liquid electronic balance 7, an inlet pressure gauge 8, an outlet pressure gauge 9 and a back pressure valve 10.

[0057] 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;

[0058] An inlet pressure gauge 8 is provided on the input pipeline 310;

[0059] The liquid outlet 32 ​​of the crack simulation tester 1 is connected directly above the recovery tank 4 through the output pipeli...

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Abstract

The invention discloses a crack simulation mechanism, a crack simulation experiment instrument and a leaking stoppage evaluation experiment device. The crack simulation mechanism comprises a rock masssample, a fixing plate, two crack plates, a plurality of sets of springs and a sealing rubber sleeve. When a leaking stoppage slurry enters a hollow groove of the rock mass sample from a liquid inletchannel of the crack simulation mechanism, the leaking stoppage slurry enters chamfered sharp corners at the top ends of the two crack plates, and the two crack plates are propped open to rotate towards the two sides around the fixing plate so as to dynamically simulate the pore cracking process. According to the crack simulation mechanism, the crack simulation experiment instrument and the leaking stoppage evaluation experiment device, the dynamic change process of the crack from closing to opening is simulated; the crack simulation mechanism can be used for the leaking stoppage effect of adrilling fluid leaking stoppage agent and the evaluation of the pressure bearing capacity of a leaking stoppage layer when an easy-to-leak stratum is drilled in the petroleum drilling process, and isused for researching the pressure-bearing capacity under the matching of different leaking stoppage materials and different dosages. On the whole, the variable leaking stoppage process of shale cracksin the leaking stoppage process while drilling is simulated, and the leaking stoppage effect is monitored and evaluated in real time.

Description

technical field [0001] The invention relates to the technical field of petroleum engineering, in particular to a gap simulation mechanism, a crack simulation experiment instrument and a plugging evaluation experiment device. 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 a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/00E21B47/005E21B47/06
CPCE21B47/00E21B47/06
Inventor 马成云冯永存邓金根李晓蓉罗超
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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