Multi-point formation pressure measuring instrument
A technology of formation pressure and measuring instruments, which is applied in the directions of measurement, wellbore/well components, earthwork drilling and production, etc., can solve the problem of high service cost of a single well, and achieve the effects of improving drilling efficiency, convenient operation and reducing risks
Inactive Publication Date: 2014-12-17
CNPC GREATWALL DRILLING ENG
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Problems solved by technology
Halliburton, Baker Hughes and Schlumberger abroad currently have formed their own formation pressure measurement technology and tool series while drilling, and the cost of single well service is expensive. At present, other domestic drilling institutes and colleges have not yet invented such tool
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Embodiment Construction
[0008] As shown in the drawings, a multi-point formation pressure measuring instrument includes a short drill collar 1, a negative pressure mechanism, a throttle guide piston cylinder 9, a main spring 10 and a main spring seat 11; the pressure gauge is fixed by the upper fastening bolt 12 On the inner wall of the short drill collar 1, the comprehensive joint 2 is fixed in the middle of the short drill collar 1 through the positioning bolt 3, the pressure guide cylinder 8 is installed in the comprehensive joint 2 through the side wall opening of the short drill collar 1, and the isolation cylinder 7 is set in the pressure guide The outer side of the cylinder 8 and the outer side of the isolation cylinder 7 are equipped with a sealing and fixing cylinder 4, an isolating cylinder sealing seat 5 and an isolating cylinder well wall sealing ring 6. The sealing and fixing cylinder 4 is threadedly connected with the short drill collar 1, and the pressure gauge and the negative pressure ...
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The invention relates to the technical field of formation pressure measurement during drilling of an oil field, in particular to a multi-point formulation pressure measuring instrument. A pressure gauge of the multi-point formulation pressure measuring instrument is fixed on the inner wall of a short drill collar through a fastening bolt at the upper part, a comprehensive joint is fixed in the middle of the short drill collar through a positioning bolt, a pressure guide cylinder is mounted in the comprehensive joint through an opening in the side wall of the short drill collar, an isolation cylinder is sheathed outside the pressure guide cylinder, a sealing and fixing cylinder, an isolation cylinder sealing seat and an isolation cylinder well wall sealing ring are sheathed outside the isolation cylinder, the sealing and fixing cylinder is in threaded connection with the short drill collar, the pressure gauge is communicated with a pore canal of a negative pressure mechanism, and the upper part of the pore canal is communicated with the comprehensive joint and the pressure guide cylinder. The multi-point formulation pressure measuring instrument disclosed by the invention can realize accurate measurement of a formation pressure parameter, improve well drilling efficiency and reduce the risk in a well drilling stage.
Description
Technical field: [0001] The invention relates to the technical field of oilfield formation pressure measurement while drilling, in particular to a multi-point formation pressure measuring instrument. Background technique: [0002] Formation pore pressure is an important parameter for reservoir description. Accurate understanding of formation pressure can detect high-pressure layers, determine pressure gradient and fluid interface, adjust drilling fluid density and effective circulating density in real time to optimize drilling, increase ROP, and safely drill into high pressure interval, optimize the casing and completion process, identify oil and gas early and modify the geological model, etc. Liaohe has entered the middle and late stages of oilfield development, and it is necessary to establish a complete set of formation pressure system to provide accurate and timely geological data for oilfield potential tapping and new layer development. Halliburton, Baker Hughes and Sc...
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IPC IPC(8): E21B47/06E21B47/01E21B49/00
Inventor 马勇喻晨吴智中李连庆陈思路焦杨
Owner CNPC GREATWALL DRILLING ENG