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Oil-gas well cement sheath seal characteristic simulation test device and test method

A simulation test, cement sheath technology, applied in construction and other directions, can solve problems such as difficulty in obtaining hydraulic isolation capacity

Active Publication Date: 2014-11-19
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, it is difficult to obtain the actual hydraulic sealing capacity of the cement sheath under the downhole working conditions, whether it is the laboratory test method or the engineering logging evaluation method

Method used

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  • Oil-gas well cement sheath seal characteristic simulation test device and test method
  • Oil-gas well cement sheath seal characteristic simulation test device and test method

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Embodiment Construction

[0032] After the cement sheath is injected, oil, gas, and water channel in the annular space and oil and gas are emitted from the wellhead, which is still a cementing quality problem that has not been well resolved at home and abroad, especially in the adjustment wells of high-pressure oil and gas layers. This phenomenon is particularly prominent. The pressure in the annular space is an important factor affecting the safe production of oil and gas wells. The evaluation of the sealing characteristics of the cement sheath is an important basis for the formulation of production measures and the evaluation of wellbore integrity. In addition, fracturing is currently the most important technology for developing low-permeability oilfields, but the channeling between thin interlayers during fracturing has seriously restricted the subdivision and stimulation of thin reservoirs by fracturing technology. The compressive strength of the rock is about 70-100MPa, and the interlayer itself is...

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Abstract

The invention discloses an oil-gas well cement sheath seal characteristic simulation test device and a test method. The device comprises a kettle, an upper kettle cover, a lower kettle cover, a heating jacket, a booster pump, a pressure relief pump and a liquid level and air flow recorder. A simulated stratum core can be placed in the kettle, a mud cake is formed on the inner wall of the core, and insertion of a casing pipe and grouting of cement paste can be realized. A solidification process of the cement paste under underground operating conditions is simulated, clean water, oil or a gaseous medium can be applied to two ends of an annular cylindrical cement sheath to form differential pressure, seal characteristics of the cement sheath in corresponding size can be evaluated by measuring leakage or variation of the differential pressure at two ends, and factors such as the casing pipe size, cement paste performance, mud cake thickness, curing pressure, temperature and the like can be changed to evaluate influences of the factors on the seal characteristic of the cement sheath.

Description

technical field [0001] The invention belongs to the field of oil and gas resource development, and in particular relates to a testing device and method capable of simulating the sealing characteristics of oil and gas well cement sheaths under actual downhole working conditions. Background technique [0002] During the construction of an oil and gas well, one or more layers of casing need to be lowered, and cement slurry is injected and solidified in the annular space formed by the casing and the formation to ensure the smooth progress of drilling operations and the safety of subsequent mining. After the cement slurry is solidified, due to the change of pressure and temperature in the wellbore or the poor sealing of the cement sheath under the action of the formation fluid, the formation fluid invades the wellbore, causing channeling between the formation layers or oil and gas emission from the wellhead. Therefore, when designing the cement slurry Or after the cement slurry s...

Claims

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Application Information

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IPC IPC(8): E21B47/005
Inventor 廖华林管志川史玉才赵效锋
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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