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Experimental device and method for simulating solidification of cement sheath in frozen soil stratum

An experimental device, cement sheath technology, applied in the field of experimental devices for simulating cement sheath consolidation, and experimental devices for simulating cement sheath consolidation in permafrost strata, which can solve the problems of high cost, difficulty in coring permafrost strata, and small structural effects, etc. question

Active Publication Date: 2018-12-18
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, it is very difficult and costly to take coring from permafrost, and the stratum is subjected to little structural action except gravity, so artificial permafrost samples can be used instead of natural cores

Method used

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  • Experimental device and method for simulating solidification of cement sheath in frozen soil stratum
  • Experimental device and method for simulating solidification of cement sheath in frozen soil stratum
  • Experimental device and method for simulating solidification of cement sheath in frozen soil stratum

Examples

Experimental program
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Effect test

Embodiment 1

[0062] An experimental device for simulating cement sheath consolidation in permafrost

[0063] Such as Figure 1 ~ Figure 5b Shown is an experimental device for simulating cement sheath consolidation in permafrost strata according to an embodiment of the present invention, including a device main body, a pressure system and a measurement system.

[0064] The main body of the device is square, including a fixed plate, a detachable plate and a device chassis 8 , and a shell 6 is provided on the side of the square main body.

[0065] The side of the square main body is composed of two detachable plates and two sets of fixed plates, and the two detachable plates are adjacently arranged; the fixed plates include fixed plate I3 and fixed plate II4, one fixed plate I3 and one fixed plate II4 form a A set of fixed plates, the fixed plate I3 and the fixed plate II4 are arranged in parallel, the fixed plate II4 is located between the fixed plate I3 and the shell 6, and the fixed plate...

Embodiment 2

[0091] The preparation method of described frozen soil sample is:

[0092] a. Spread a layer of butter on the surface of the central column 1, install it from the round hole I under the device chassis 8, and install it upright;

[0093] b. Insert the limiting plate I17 and the limiting plate II33 into the groove IV on the adjacent two sides; the limiting plate I17, the limiting plate II33, the bottom steel plate 11, and the two adjacent fixing plates I3 form the cavity 7;

[0094] c. Slowly fill the wet soil that has been uniformly mixed according to a certain soil-water ratio into the cavity 7 of the device. For every 1 / 5 of the volume of the cavity, use a square piston with a round hole in the middle to compact it until it is empty. Cavity 7 is filled;

[0095] d. Place the axial pressure pressurizing device 2 at a fixed position above the device cavity 7, supported by compacted wet soil;

[0096] e. Open the third valve 20 and the third oil pump 21, pressurize the axial p...

Embodiment 3

[0099] The method for simulating the cement sheath consolidation process in permafrost stratum is as follows:

[0100] 1) After the preparation of the frozen soil sample is completed, lift the limiting plate I17 and the limiting plate II33 through the pull ring 18, put the filling plate into the groove in IV, and put the pressure transmitting plate I31 and the pressure transmitting plate II35;

[0101] 2) Take out the core to prepare the central column 1, and install the heat-insulating casing with a base from the bottom of the device chassis 8; a cement sheath annular space 29 is formed between the frozen soil sample and the heat-insulating casing column. Due to the creep effect of frozen soil, a small amount of cement will overflow, indicating that the creep effect on the consolidation of the cement sheath is by extrusion.

[0102] 3) Set the temperature of the cold storage as the test temperature, turn on the working computer 27, until all the temperature sensor indications...

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Abstract

The invention discloses an experimental device for simulating solidification of a cement sheath in a frozen soil stratum, and belongs to the field of oil and gas well cementing. The device comprises adevice main body, a pressure system and a measurement system; the main body comprises a fixed plate, a detachable plate and a device chassis; a round hole is formed at the center of the base; a central post or a thermal sleeve is mounted on the base by the round hole; and the fixed plate, the detachable plate, the device chassis and the central post or the thermal sleeve form a cavity for preparing a core and the cement sheath. When the device is in use, the device is placed in a low-temperature environment, the frozen soil core with a middle hollow cylinder can be man-made and tripped into athermal sleeve seat, cement is added to simulate a solidification working condition of the cement sheath under an actual stratum condition, and meanwhile, extrusion of heat transfer on the frozen soil stratum and creep of frozen soil to the cement sheath in the solidifying process of the cement sheath and the solidification condition of the cement sheath are measured by a temperature sensor, a strain gauge and an acoustic wave. The experimental device has the advantages of low cost, high efficiency, easiness for use and the like.

Description

technical field [0001] The invention relates to an experimental device for simulating cement sheath consolidation, in particular to an experimental device and method for simulating cement sheath consolidation in permafrost strata. It belongs to the field of oil and gas well cementing. Background technique [0002] With the development of the oil industry and the increasing demand for energy, unconventional oil and gas resources have gradually become the focus of oil and gas exploration and development. In 2008, the US Geological Survey issued a report confirming that the Arctic region is rich in oil and gas resources. Countries around the world began to focus on Exploration and development of polar oil and gas resources. In my country's Qinghai-Tibet Plateau, Jungar Basin and other permafrost regions, there are also huge potentials for oil and gas development. Therefore, research on oil and gas exploration and development technology in permafrost is imminent, especially cem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28
CPCG01N1/286E21B41/00G01N33/383G01N3/12E21B33/14G01N3/02
Inventor 闫传梁李阳程远方韩忠英宋本健周晓辉
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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