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Oil and gas well cement sheath sealing characteristics simulation test device and experimental method

A technology of simulation testing and cement sheath, applied in construction and other fields, can solve problems such as difficulty in obtaining hydraulic sealing capacity

Active Publication Date: 2016-08-24
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 and gas well cement sheath sealing characteristics simulation test device and experimental method
  • Oil and gas well cement sheath sealing characteristics simulation test device and experimental 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 and gas well cement sheath sealing characteristic simulation testing device and an experimental method. The device comprises a kettle body, an upper kettle cover, a lower kettle cover, a heating jacket, a booster pump, a pressure relief pump and a liquid volume and gas volume recorder. The simulated formation core can be placed in the kettle body, and a mud cake can be formed on the inner wall of the core, and the casing can be inserted and the cement slurry can be poured; the solidification process of the cement slurry under the condition of simulating the downhole working conditions can be applied to both ends of the annular columnar cement sheath with water, oil or The gas medium forms a pressure difference, and evaluates the sealing characteristics of the corresponding size cement sheath by measuring the leakage or the change of the pressure difference between the two ends, and can change the casing size, cement slurry performance, mud cake thickness, curing pressure, temperature and other factors , to evaluate its effect on the sealing 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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Patent Type & Authority Patents(China)
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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