Internal and external differential pressurizing test tool and test method for underground measuring instrument

Abstract

The invention belongs to the technical field of drilling engineering, and especially relates to an internal and external differential pressurizing testing tool and method for an underground measuringinstrument. The tool is characterized by comprising a bottom support, u-shaped fixing frame, a pressure-bearing cylinder and an exhaust hole I, an outer pressure plug and an inner pressure plug in threaded connection with the pressure-bearing cylinder, a water injection hole I formed in the middle of the external pressure plug, an outer pressure pipeline connected with the water injection hole I through an adapter substitute I, a water injection hole II and an exhaust hole II formed in the inner pressure plug, an inner pressure pipeline connected with the water injection hole II through an adapter substitute II, a short section testing instrument and an instrument plug arranged in the pressure bearing cylinder, and a rolling centralizing block arranged along the circumference of the instrument plug. According to the invention, the whole machine pressurizing test can be carried out on the short section type downhole measuring instrument. The stress state of the downhole drilling tool under the influence of the internal and external drilling fluid pressures in the downhole operation process can be truly simulated, and the tool has important significance for researching the influenceof different internal and external drilling fluid pressures on the measurement of bit pressure and torque of the downhole instrument.

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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