Device for measuring radial pressure of underground sucker rod

Abstract

The invention belongs to the technical field of metering and testing, and relates to the improvement of a device for measuring the radial pressure of a sucker rod when an eccentric wearing phenomenon occurs between the underground sucker rod and an oil tube. The improved device comprises a pup joint, sealing rings, a ring bush, a resistance strain gauge and an integrated circuit system, and is characterized in that the pup joint of a through-hole type is provided; two sections of internal threads are respectively arranged at the two ends of the through-hole; ring grooves are respectively arranged at the inner ends of the internal threads; the sealing rings are placed in the grooves; the elastic ring bush is clung to the inner surface of the through-hole of the pup joint; the resistance strain gauge is stuck to the inner surface of the ring bush; and the integrated circuit system is mounted at the inner part of the pup joint. According to the device disclosed by the invention, the measured maximum radial pressure is 500KN, the measured minimum radial pressure is 10N, the maximum withstand voltage is 35MPa, and the highest working temperature is 120 DEG C.

Description

technical field [0001] The invention belongs to the technical field of metering and testing, and relates to the improvement of a sucker rod radial pressure measuring device when eccentric wear occurs between a downhole sucker rod and an oil pipe. Background technique [0002] At present, the oil pumping method commonly used at home and abroad is rod pumping, which has the advantages of low oil production cost, convenient management and maintenance, and wide application range. The basic composition of rod pumping is that a casing is first laid in the oil well between the ground and the oil layer, and then the tubing is installed in the casing, and the sucker rods connected to each other by couplings are placed in the tubing. In the process of oil pumping, eccentric wear often occurs between the sucker rod and the tubing. With the increase in the number of oil wells with special structures such as sidetracking wells and directional deviated wells, the problem of eccentric wear...

AI Technical Summary

Problems solved by technology

For example, in the article "Development of the load sensor sub-section of the sucker rod string downhole mechanical inspection instrument" (Liu Songlin et al., Petroleum Instruments, 2007, 2: 4-7.), although it is considered that the sub-section should meet the requirements of temperature, pressure, corrosion and scaling, Requirements such as small space and large load changes also determine the main technical indicators of the load sensor, but what the sensor detects is the result of the comprehensive action of multiple mechanical parameters such as the tension, pressure and torque on the sucker rod, and cannot detect the occurrence of The actual value of the radial pressure on the sucker rod during eccentric wear

"Downhole Storage Rod and Tube Parameter Detector" (patent number: ZL 200420024926.6) proposes a specific structure for multiple parameter detectors, and connects the designed sensor silo and circuit board silo in series to the joint of the sucker rod Among them, parameters such as tension pressure, torsion force, temperature, acceleration and inclination can be detected, but the radial pressure of the sucker rod cannot be detected

"A device for detecting the state of a pipe string" (patent number: ZL 200820219679.3) proposes a detection device composed of two parts, the downhole and the surface, and realizes the integrated measurement of the downhole pipe string temperature, axial force and pipe string sliding displacement , but the specific value of the radial pressure of the sucker rod cannot be detected

In summary, although the existing measuring instruments or detection technologies can measure different parameters in the downhole, for one of the most important mechanical parameters when eccentric wear occurs between the sucker rod and the tubing, that is, the radial pressure of the sucker rod There is no effective measuring device for the specific value of

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