A constant pressure control system for oil well cement curing kettle

Abstract

The invention discloses a constant pressure control system for an oil well cement curing kettle. The constant pressure control system for the oil well cement curing kettle comprises a back pressure controller, a back pressure energy accumulator and a connecting pipeline I. The back pressure controller is communicated with a kettle body through the connecting pipeline I, the connecting pipeline I is communicated with a connecting pipeline II, one end of the connecting pipeline II is communicated with the connecting pipeline I, and the other end of the connecting pipeline II is communicated with the energy accumulator; a pressure control valve is arranged on the connecting pipeline I, a back pressure pressurization valve is arranged on the connecting pipeline II, the connecting pipeline II is further communicated with a connecting pipeline III, and a back pressure depressurization valve is arranged on the connecting pipeline III. The constant pressure control system is adopted to replace traditionally-used pressurized equipment such as an air compressor, a hydraulic pump, a solenoid valve and a buffer tank, pressure fluctuation can be precisely controlled, and control pressure is automatically stabilized; in the GB10238-2005 standard, the requirement for the pressure fluctuation is + / -0.345MPa, while actual control precision of the constant pressure control system can reach + / -0.25MPa and reaches the unreachable technological level of a former solenoid valve and other technologies.

Description

technical field [0001] The invention relates to the technical field of testing equipment for physical and mechanical properties of cement, in particular to a constant-pressure pressure control system 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 APISpec10A. my country's GB10238-2005 is equivalent to the standard content of APISpec10A, oilfield users use APIRP10B, and my country's GB19139-2003 is equivalent to the standard content of APIRP10B. 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...

AI Technical Summary

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

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