An internal and external differential pressure test tool and test method for downhole measuring instruments

Abstract

The invention belongs to the technical field of drilling engineering, and in particular relates to an internal and external differential pressure test tool and test method for downhole measuring instruments. The external pressure plug and the internal pressure plug connected by the thread of the pressure cylinder are set in the water injection hole Ⅰ in the middle of the external pressure plug, and the external pressure pipe connected to the water injection hole Ⅰ through the conversion joint Ⅰ is set in the internal pressure plug. Water injection hole Ⅱ and exhaust hole Ⅱ, the internal pressure pipe connected to the water injection hole Ⅱ through the conversion joint Ⅱ, the pup test instrument set in the pressure-bearing cylinder, the instrument plug, and the rolling righting arranged along the circumference of the instrument plug piece. The present invention can carry out the whole machine pressure test on the puppet type downhole measuring instrument, and truly simulate the stress state of the downhole drilling tool when it is affected by the pressure of internal and external drilling fluids during the downhole operation process, and is useful for studying the impact of different internal and external drilling fluid pressures on downhole instruments. Measuring the impact of weight on bit and torque is of great significance.

Description

technical field [0001] The invention belongs to the technical field of drilling engineering, and in particular relates to an internal and external differential pressure test tool and test method of an underground measuring instrument. Background technique [0002] During the drilling process, measuring the pressure and torque near the drill bit plays a vital role for on-site technicians to understand the downhole working conditions in real time and prevent downhole accidents. , will also be affected by factors such as internal and external drilling fluid pressure, temperature, vibration, etc. Whether the error can be corrected to accurately measure the WOB and torque becomes the decisive factor to measure the measurement accuracy of the instrument. [0003] At present, the measurement of downhole drilling pressure and torque is mainly based on the strain test technology: firstly, slot and drill holes on the measuring nipple, and then paste high-precision strain gauges in the...

AI Technical Summary

Problems solved by technology

At present, the interaction between the WOB and torque can be more effectively corrected by a reasonable patch scheme and the calibration test of the ground compound testing machine. However, the influence of internal and external drilling fluid pressure on the measured WOB torque (especially When there is a difference in internal and external pressure), there is currently a lack of effective correction measures and test equipment

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