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Method for maintaining oil-well cement

An oil well cement and cement technology, which is applied to instruments, ceramic molding machines, analytical materials, etc., can solve the maintenance of strip test blocks, the failure to test the flexural properties of oil well cement, and the inability to achieve constant pressure heating and constant pressure cooling, etc. question

Active Publication Date: 2015-06-17
JIAHUA SPECIAL CEMENT
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  • Abstract
  • Description
  • Claims
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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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  • Method for maintaining oil-well cement
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  • Method for maintaining oil-well cement

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Embodiment Construction

[0059] Below in conjunction with accompanying drawing, the present invention is further described:

[0060] A maintenance method for oil well cement, comprising the following steps in sequence:

[0061] Sample processing and installation steps: the cement sample is molded after pulping; put the mold filled with the cement sample into the kettle body and seal it with a cover;

[0062] Debugging steps: add water to the kettle body, close the high-pressure valve on the upper part of the kettle body and the high-pressure valve on the lower part of the kettle body after the air in the kettle body is removed, close the back pressure reducing valve, open the back pressure boosting valve, and use the hydraulic pump controller to control the hydraulic pump Pressurize the pressure of the kettle body to the specified set value, keep the pressure of the kettle body consistent with the back pressure, close the back pressure boost valve, and keep the back pressure controller in the blocking...

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Abstract

The invention discloses a method for maintaining oil-well cement. The method is characterized by including steps of sample processing and installing, debugging, constant pressure temperature rising, pressure and temperature keeping, and constant pressure temperature lowering. A pressing method of equipment such as conventionally used air compressors, pressure pumps, solenoid valves and buffer tanks is replaced by the method which can perform constant pressure control, control pressure fluctuation precisely and control pressure automatically and stably. The actual control accuracy of the method for maintaining the oil-well cement can reach + / -0.25MPa while the standard pressure fluctuation is + / -0.345MPa according to requirements of GB10238-2005 or GB19139-2003, and therefore, the technological level which can be hardly achieved by conventional technologies of the solenoid valves and the like is reached.

Description

technical field [0001] The invention relates to the technical field of cement physical and mechanical performance detection, in particular to a maintenance method for oil well cement strength detection. 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 been no fundamental ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B28B11/24G01N3/02
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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