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A constant pressure control method for oil well cement curing kettle

A technology of pressure control and oil well cement, applied in the direction of electric fluid pressure control, etc., can solve the problems of strip test block maintenance, inability to test the flexural performance of oil well cement, constant pressure rise and constant pressure drop, etc.

Active Publication Date: 2015-09-16
JIAHUA SPECIAL CEMENT
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of this patent are: 1. Only the cubic test block for testing the compressive performance of oil well cement can be maintained, but the strip test block for testing the flexural performance of oil well cement cannot be maintained; 2. During the maintenance process , cannot achieve constant pressure heating and constant pressure cooling, which does not meet the requirements of GB10238-2005 or GB19139-2003

Method used

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  • A constant pressure control method for oil well cement curing kettle
  • A constant pressure control method for oil well cement curing kettle
  • A constant pressure control method for oil well cement curing kettle

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Embodiment Construction

[0052] Below in conjunction with accompanying drawing, the present invention is further described:

[0053] A constant pressure control method for oil well cement curing kettle, comprising the following steps:

[0054] Constant pressure heating step: the pressure of the mold with cement samples and the kettle body of water increases after heating, and the excess pressure is released by a back pressure controller, so that the kettle body maintains a constant pressure during the heating process;

[0055] Constant pressure and constant temperature step: after the constant pressure and temperature raising step, keep the temperature constant and keep the pressure of the kettle body constant within the fluctuation range;

[0056] Constant pressure cooling step: the mold with the cement sample and the kettle body of water undergo heat exchange and cooling with cold water, and the pressure decreases. When the pressure of the kettle body is lower than the back pressure, the back pressu...

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Abstract

The invention discloses a constant voltage pressure control method used for an oil well cement curing kettle. The constant voltage pressure control method sequentially comprises the following steps of: constant voltage heating, constant voltage constant temperature and constant voltage cooling. A conventional pressurization method in which an air compressor, a hydraulic pump, an electromagnetic valve, a buffer tank and the like are used is replaced by the constant voltage pressure control method, pressure surges can be accurately controlled, and the pressure is controlled in an automatic and stable manner. The pressure surges in GB10238-2005 is + / -0.345MPa, and the actual control precision of the constant voltage pressure control method can reach + / -0.25MPa and reaches the technical level which technologies, such as the conventional electromagnetic valve technology in the prior art can not reach.

Description

technical field [0001] The invention relates to the technical field of cement physical and mechanical performance detection, in particular to a constant-pressure pressure control method for oil well cement curing kettles. Background technique [0002] The oil well cement curing kettle is an instrument and equipment used to provide a high temperature and high pressure curing environment for testing the strength of oil well cement. Its technical requirements comply with API Spec 10A. my country's GB10238-2005 is equivalent to the standard content of API Spec 10A, oilfield users use API RP 10B, and my country's GB19139-2003 is equivalent to the standard content of API RP 10B. At present, the curing kettle of CANDLER company is generally used in the world, and the typical model is 7370. Some manufacturers in Shenyang and other places in my country have digested foreign technology and produced curing kettles by themselves. Although there have been some improvements, there has b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05D16/20
Inventor 陈东陈一健张伦平黎茜古安林阳运霞曾雪玲
Owner JIAHUA SPECIAL CEMENT
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