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Formation pressure measuring device while drilling

A technology of formation pressure and measuring device, applied in the field of oil drilling, can solve the problems of prolonged drilling operation time and increased drilling cost, and achieve the goal of optimizing drilling fluid density and equivalent circulating density, reducing operation risk and drilling cost, and improving prediction accuracy. Effect

Active Publication Date: 2011-07-20
BEIJING LIUHE GREATNESS TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These situations often lead to the extension of drilling operation time and the increase of drilling cost

Method used

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  • Formation pressure measuring device while drilling
  • Formation pressure measuring device while drilling
  • Formation pressure measuring device while drilling

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Experimental program
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Effect test

Embodiment Construction

[0014] The implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0015] Such as figure 1 As shown, the formation pressure measurement device while drilling generally includes a measurement drill collar 1 , a mud pulse generator assembly 2 and a formation pressure measurement assembly 3 .

[0016] Such as figure 2 As shown, the mud pulse generator assembly 2 is composed of the main valve outer ring pressure sleeve 4, the main valve outer ring 5, the outer ring sealing ring 6, the directional inner sleeve 7, the pressure guiding piston rod cap 8, the main valve pressure guiding piston rod 9. Filter skeleton 10, filter screen 11, main valve inner ring 12, main valve semi-circular key 13, main valve inner ring sealing ring 14, main valve piston barrel 15, anti-rotation bolt 16, directional bolt 17, directional bolt Sealing ring 18, main valve spring 19, servo valve outer cylinder 20, servo valve outer cylinder sealing r...

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Abstract

The invention relates to a formation pressure measuring device while drilling. The measuring device generally comprises a measuring drill collar, a mud pulse generator assembly and a formation pressure measuring assembly. An annular conical end part of a small-diameter section of an isolating piston cylinder of the measuring device has high formation embedding capacity under the action of huge hydraulic thrust, an annular cone of a large-diameter section has the function of compressing formation outside the isolating piston cylinder so as to achieve the function of pressing and sealing; and due to the sealing function of a wall cake, the isolating cylinder has double sealing function. The measuring device can provide a real-time checkpoint for a pore pressure model in the drilling process, improves the prediction accuracy of the pore pressure, optimizes the drilling fluid density and equivalent circulating density in real time, avoids well kick, blowout, formation damage or accident formation breakdown, circulation fluid leakage and other downhole accidents, and can provide annular pressure in real time to optimize the drilling process, can early detect a high pressure zone, determine pressure gradient and fluid interface, and adjust the mud ratio in real time.

Description

Technical field [0001] The invention relates to a petroleum engineering drilling construction measuring device, which belongs to the technical field of petroleum drilling. Background technique [0002] In the drilling process of vertical wells, directional wells, including horizontal wells and extended-reach wells, due to inaccurate formation pressure prediction, downhole complex situations such as drilling fluid loss, formation liquid invasion, wellbore collapse and differential pressure sticking often occur. These situations often lead to the extension of drilling operation time and the increase of drilling cost. Therefore, one of the keys to drilling is to keep the drilling fluid density and equivalent circulating density within the safe operating range of formation fluid pressure, formation collapse pressure and formation fracture pressure. Formation pressure measurement while drilling can provide a real-time calibration point for the pore pressure model during drilling...

Claims

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Application Information

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IPC IPC(8): E21B47/06E21B47/18E21B49/00
Inventor 冯建宇吴晓毅
Owner BEIJING LIUHE GREATNESS TECH
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