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A crack simulation mechanism, a crack simulation experiment instrument and a leak plugging evaluation experiment device

A technology for simulating experiments and fractures. It is used in surveying, wellbore/well components, construction, etc. It can solve the problem of not being able to dynamically simulate the morphological changes of shale fractures, and achieve the effect of monitoring and evaluating the effect of plugging.

Active Publication Date: 2022-07-05
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A crack simulation mechanism, a crack simulation experiment instrument and a leak plugging evaluation experiment device
  • A crack simulation mechanism, a crack simulation experiment instrument and a leak plugging evaluation experiment device
  • A crack simulation mechanism, a crack simulation experiment instrument and a leak plugging evaluation experiment device

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 provides a gap simulation mechanism, the structure of which will be described in detail below.

[0029] refer to figure 1 , the gap simulation mechanism can realize dynamic simulation of shale fracture morphology changes, including rock mass sample 11, fixed plate 12, two cracked plates 13, multiple sets of springs 14 and sealant sleeves 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 connected to the upper part of 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 symmetrically arranged 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...

Embodiment 2

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

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

[0042] The upper cover 22 and the lower cover 23 are respectively arranged on the top and bottom ends of the cylinder body 21, the upper plug 24 and the lower plug 25 are inside the cylinder 21 and are in close contact with the upper cover 22 and the lower cover 23, respectively. The plug 24 , the lower plug 25 and the cylinder 21 together form a containing cavity 20 . The geometric size of the containing cavity 20 is just enough to accommodate the rock mass sample 11 , and the gap simulation mechanism is ins...

Embodiment 3

[0055] Embodiment 3 provides an experimental device for plugging evaluation, including the crack simulation experimental apparatus of Embodiment 2, the structure of which is described in detail below.

[0056] refer to Figure 9 and Figure 10 , the experimental device also includes a liquid storage tank 3, a recovery pool 4, a hydraulic pump 5, a hand pressure pump 6, a weighing 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 communicated with the liquid inlet of the hydraulic pump 5 through the pipeline, and the liquid outlet of the hydraulic pump 5 is communicated with the liquid inlet 31 of the crack simulation experiment instrument 1 through the 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 experimenter 1 is connected to the upper part of the recovery t...

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Abstract

The invention discloses a gap simulation mechanism, a crack simulation experiment instrument and a leakage plugging evaluation experimental device, wherein the gap simulation mechanism includes a rock mass sample, a fixed plate, two seam plates, multiple groups of springs and a sealing rubber sleeve. After entering the hollow groove of the rock mass sample from the liquid inlet channel of the gap simulation mechanism, the plugging slurry enters the chamfered corners at the top of the two seam plates, and the two seam plates are propped up and rotated to both sides around the fixed plate to dynamically simulate the pore cracking process. . The gap simulation mechanism, the fracture simulation experiment instrument and the leakage plugging evaluation experimental device disclosed by the invention simulate the dynamic change process of the fracture from closing to opening, and can be used for the drilling fluid plugging agent to block the leakage of the leakage-prone formation in the process of oil drilling. The leakage effect and the pressure bearing capacity of the plugging layer are evaluated, and the pressure bearing capacity under different combinations of leakage plugging materials and different addition amounts is studied. On the whole, it not only realizes the variable plugging process of shale fractures in the process of simulating leakage while drilling, but also realizes real-time monitoring and evaluation of the plugging effect.

Description

technical field [0001] The invention relates to the technical field of petroleum engineering, in particular to a crack simulation mechanism, a crack simulation experiment instrument and a leakage 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 has plagued oil exploration and development at home and abroad, and has not been completely solved so far. Most drilling processes have different degrees of leakage. Severe lost circulation will lead to a drop in wellbore pressure, affecting normal drilling, causing wellbore instability, inducing formation fluids to flood into the wellbore and causing blowouts. Field experience shows that the success rate of plugging is less than 30%. [0003] At present, a large number of researchers have carried out research on different types of leakage problems, and proposed various materials of leakage plugging ...

Claims

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Application Information

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Patent Type & Authority Patents(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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