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An experimental device for real-time monitoring of cement sheath seal integrity

An experimental device and cementing cement technology, which is applied in measurement, borehole/well components, construction, etc., can solve the problem of not being able to monitor the sealing performance of the cementing cement sheath, and achieve the effect of reducing the cost of the experiment and achieving accurate measurement values

Active Publication Date: 2021-11-02
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 an experimental device for real-time monitoring of the sealing integrity of the cement sheath to solve the problem in the prior art that the sealing performance of the cement sheath cannot be monitored in real time and continuously for the entire well section

Method used

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  • An experimental device for real-time monitoring of cement sheath seal integrity
  • An experimental device for real-time monitoring of cement sheath seal integrity
  • An experimental device for real-time monitoring of cement sheath seal integrity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: An experimental device for real-time monitoring of the integrity of the cement sheath seal when simulating the cement slurry returning to insufficient height

[0028] Embodiment 1 provides an experimental device for real-time monitoring of the sealing integrity of the cement sheath, and its structure will be described in detail below.

[0029] refer to Figure 1 to Figure 2 , the device includes a fixture 1 , a wellbore device 2 and a cement slurry injection system 3 .

[0030] The fixing device 1 includes a base plate 11 , a base 12 , several fixing bolts 13 , a fixing ring 14 , and a bottom positioning ring 15 .

[0031] Wherein, the base plate 11 is a rectangular plate, the shape of the base 12 is a hollow cylinder, a circular groove is arranged in the middle of the base 12, a plurality of bolt holes are arranged circumferentially at intervals around the base 12, and corresponding bolt holes are provided at the end of the base plate 11. Perforation, a nu...

Embodiment 2

[0041] Example 2: Experimental device for real-time monitoring of seal integrity when simulating well cemented cement sheath cemented surface cracks

[0042] Embodiment 2 On the basis of Embodiment 1, a dyeing liquid injection system 4 is added.

[0043] refer to image 3 and Figure 4 , the dyeing liquid injection system 4 includes a dyeing liquid storage device 41, a dyeing liquid injection pipe 42 and a dyeing liquid pump 43, the dyeing liquid storage device 41 is arranged on the substrate 11, between the dyeing liquid storage device 41 and the cement sheath cavity 24 It communicates with the dyeing liquid injection pipe 42, and the dyeing liquid injection pipe 42 is provided with a dyeing liquid injection pump 43.

[0044] Among them, the function of the dyeing liquid injection system 4 is to inject the dyeing liquid in the dyeing liquid storage device 41 into the bottom of the second cementing surface 27 of the cement sheath, and under the action of the injection pressu...

Embodiment 3

[0050] Example 3: Experimental device for real-time monitoring of seal integrity when simulating cement sheath oil and gas leakage

[0051] Embodiment 3 On the basis of Embodiment 1, an oil and gas storage device 50 and a set of oil and gas injection system 5 are added.

[0052] refer to Figure 5 and Figure 6 , the cement sheath cavity 24 is filled with cement slurry to form a cement sheath 25 whose height is equal to the height of the cement sheath cavity 24 . The cement sheath 25 is provided with an oil and gas channel. It is worth mentioning that, in order to set the oil-gas channel in the cement sheath 25 , it is necessary to pre-embed U-shaped pipe fittings in the wall of the outer cylinder 21 .

[0053] The oil and gas injection system 5 includes an oil and gas injection pipe 51, an oil and gas discharge pipe 52, an oil and gas injection pump 53 and a set of control devices,

[0054] The oil and gas inlet end of the oil and gas injection pipe 51 is connected with t...

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Abstract

The invention discloses an experimental device for real-time monitoring of the sealing integrity of a cement sheath, which comprises a fixing device, a well body device and a cement slurry injection system. Both the bottom end of the inner casing and the bottom end of the outer cylinder are fixed in the base, and The cavity between the inner wall of the outer cylinder and the outer wall of the inner casing forms a cement sheath cavity, and the optical fiber sensing cable is arranged on the outer wall of the inner casing; the cement slurry storage device and the cement sheath cavity are injected with cement slurry The pipe is connected, and the cement slurry injection pipe is provided with a grout injection pump. The experimental device for real-time monitoring of the sealing integrity of the cement sheath disclosed by the present invention realizes the real-time and continuous monitoring of the sealing integrity of the cement sheath in the whole well section, the measured value is accurate and reliable, and the sealing integrity of different cement sheaths is achieved. For permanent monitoring experiments, only the outer cylinder and the corresponding injection system of the simulated formation pipeline with different functions need to be replaced, which greatly reduces the cost of the experiment.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling engineering, in particular to an experimental device for real-time monitoring of the sealing integrity of a cement sheath. Background technique [0002] The integrity of the sealing effect of the cement sheath is an important issue that runs through the entire life cycle of oil and gas wells and is related to the safe and efficient development of oil and gas and environmental protection. The failure of the cement sheath seal will cause channeling, and the oil and gas in the producing zone or non-producing zone will cause the annular space to be under pressure, which will further cause well kicks, blowouts and other accidents. The real-time monitoring of the integrity of the cement sheath seal in the whole life cycle can issue an early warning of the risk of underground fluid leakage caused by the failure of the cement sheath seal, which is a key link to ensure the safe and efficient dev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/005E21B47/00
CPCE21B47/00E21B47/005E21B33/13
Inventor 李晓蓉冯永存张毅王丰岳古臣旺段梦兰
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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