Zero-displacement measuring device under casing pipe string circulation elastoplasticity thermal stress and measurement and control method

Abstract

The invention discloses a maintained zero displacement measuring device under a casing pipe string circulation elastoplasticity thermal stress and a measurement and control method. The measuring device comprises one pair of an upper stiffness right angle frame and a lower stiffness right angle frame, and measuring components. Vertical edges of the pair of the upper stiffness right angle frame andthe lower stiffness right angle frame are symmetrically arranged on two sides of upper and lower casing pipe strings of a casing pipe string displacement measuring section. Transverse edges are symmetrically provided with upper and lower positioning devices for installing the measuring components. The two side measuring components are vertically parallel to a middle casing pipe string displacementmeasuring section between the upper and lower positioning devices. The device and the method have advantages that a loading system can timely load shrinkage and expansion caused by a thermal stress change resisting a casing pipe string so that a casing pipe string displacement control section can be controlled under 0+ / -0.01in zero displacement under ten thermal cycles.

Description

technical field [0001] The invention relates to a high-precision displacement measurement and control device and method for maintaining a zero displacement of 0±0.01in for the entire casing string under cyclic elastic-plastic thermal stress. Under the SAGD and CSS well conditions in the Canadian block, the casing strings sealed with special buckle joints have to go through ten elastic-plastic thermal stress cycles from room temperature to 290 °C. Under these well conditions, stress relaxation occurs in the casing string. This method was invented in order to evaluate whether the special buckle joint leaks and whether the casing string fails under this well condition. Background technique [0002] In recent years, the environmental well conditions of the international oil and gas industry have become increasingly complex, and more stringent requirements have been put forward for the oil casing and special buckle joints used. Among them, the oil casing special buckle joints ar...

AI Technical Summary

Problems solved by technology

Then, research and development were carried out in our own laboratory, and various heating and thermal insulation methods were explored, but the impact on the displacement sensor could not be eliminated. The thermal effect would cause the temperature of the displacement sensor to reach 50 to 60 degrees, which exceeded the maximum temperature of the displacement sensor, resulting in displacement. The accuracy of the sensor is reduced or even damaged

More than ten kinds of displacement mounting devices have been designed, but none of them can eliminate the load distortion caused by displacement drift during pull / press commutation

The reaction rate of the loading system cannot track the change of thermal stress in time

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