Development and Use of a Downhole System for Measuring Drilling Engineering Parameters

Abstract

A system capable of operating in downhole conditions at depths of several thousand meters is developed for measuring drilling engineering parameters (DEP) in real time. The aim is to monitor DEP during drilling, including the weight on the drill bit (WOB), torque on the drill bit (TOB), and lateral force on the drill bit. The design of the structure and parameters of the sensors, calibration of the sensors, and the field test results are described. Four separate strain gages and a measuring system are designed to measure DEP in the downhole during drilling in real time. The field tests show that the designs are sound. The measured axial force is greater than the calculated value, which means that the real WOB is higher than the logging WOB and the real TOB is greater than the logging torque. Thus, the survey instruments can meet the requirements for rotary steerable drilling and conventional drilling. The measured WOB and TOB data can also be used to analyze drill string vibrations. Keywords: measurement of downhole parameters during drilling, drilling engineering parameters (DEP), weight on bit, torque on bit, lateral force on bit.The safety and efficiency of drilling operations are of the highest priority for drilling companies due to the increasing risk of serious accidents and the complexity of those operations [1]. Rapid and accurate drilling of wells is one of the criteria by which the efficiency of drilling operations is evaluated. Drilling can

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“…At the point of each equivalent magnetic dipole unit, the strength of the magnetic source can be calculated by using Equation (1). Based on the strength, the magnetic moment of the unit is determined.…”

“…Based on the strength, the magnetic moment of the unit is determined. Then the magnetic field strength of the unit at a certain spacial point is determined by again using Equation (1). The field of the entire casing or drill pipe could be figured out by superposing all the volume elements of the field.…”

“…In Equation (4), m is the magnetic permeability of the casing or drill pipe, and its specific values are different according to the use of ferromagnetic material. After m Δvi of ΔV i is determined, the magnetic field strength of ΔV i at a certain measuring point Pt can be calculated by using Equation (1). Let the field of ΔV i be B i .…”

“…Complex structure well is an effective and important type for the exploitation of such unconventional oil and gas resources. 1 Dual horizontal wells, as one of the basic types of complex structure wells, have been widely used in exploitation of heavy oil, shale gas, and natural asphalt. 2,3 Compared with traditional well structures, the dual horizontal wells greatly improve the exploiting efficiency and bring more profits.…”

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“…The technique can be used for drilling in different types of rock, it does not cause any disturbances in production, and it provides high-resolution information on the rock mass in an inexpensive way. It has been used for several drilling techniques, including rotary drilling, percussive drilling, and core drilling [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. However, despite the potential of the technique, it has not yet become an independent tool to support decision-making in underground mine operations.…”