Pressure control device for whole-process underbalanced drilling and use method

It is an underbalanced drilling and whole-process technology, which is applied in earthwork drilling, wellbore flushing, and wellbore/well components. The effect of simple operation and simple structure

Inactive Publication Date: 2016-09-28
CNPC XIBU DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a whole-process underbalanced drilling pressure control device, which overcomes the deficiencies of the prior art and can effectively solve the lack of continuous compensation for wellbore hydrostatic column pressure and The problem of control, more effectively solves the problem that the existing downhole drilling needs to use the kelly pump to assist in opening the downhole casing valve, and its operating procedures are cumbersome and complicated

Method used

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  • Pressure control device for whole-process underbalanced drilling and use method

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Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: as attached figure 1As shown, the whole-process underbalanced drilling pressure control device includes wellhead blowout preventer group 1, rotary control head 2, downhole casing valve 3, casing string 16, drilling fluid circulation processing device, special choke manifold 6, drilling Pump set 7, drilling fluid continuous injection device for detecting injection pressure and flow rate, and ground control device capable of opening and closing the downhole casing valve 3. The downhole casing valve 3 is fixedly installed on the upper casing string 16, and the outlet of the ground control device It is connected with the downhole casing valve 3 through a pipeline. On the top of the casing string 16 above the downhole casing valve 3, the rotary control head 2 and the wellhead blowout preventer group 1 are fixedly installed in sequence from top to bottom, and the drilling fluid The outlet of the continuous injection device and the grouting port of the rotary con...

Embodiment 2

[0037] Embodiment 2: as figure 1 As shown, a method for using the above-mentioned pressure control device for underbalanced drilling in the whole process includes the following steps:

[0038] The first step is to install the whole-process underbalanced drilling pressure control device before the whole-process underbalanced drilling operation; lower the downhole casing valve 3 together with the upper casing string 16 to an appropriate well depth;

[0039] The second step is to drill according to the routine. When the drill bit is close to the downhole casing valve 3, the wellhead seat seal rotates the control head 2, opens the throttle valve 31 on the special throttle manifold 6, and checks the pressure reading of the second pressure gauge 18 , to ensure that the wellhead back pressure at this time is equal to the wellhead back pressure when tripping under pressure, so that the bottom of the well is always in a relatively stable underbalanced state during tripping; check wheth...

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Abstract

The invention relates to the technical field of unbalanced drilling in oil and gas fields and provides a pressure control device for whole-process underbalanced drilling and a use method. The pressure control device comprises a wellhead blowout preventer stack, a rotary control head, a downhole deployment valve, a casing string, a drilling fluid circulating processing device, a special choke manifold, a drilling pump unit and a drilling fluid continuous pouring device which is capable of detecting injecting pressure and flow, wherein the downhole deployment valve is fixedly mounted on the casing string on the upper layer, a ground control device for opening and closing the downhole deployment valve is connected onto the downhole deployment valve, and the rotary control head and the wellhead blowout preventer stack are fixedly mounted sequentially from top to bottom at the top of the casing string above the downhole deployment valve. Reasonable back pressure is applied to a wellhead by regulating the opening degree of a throttle valve of the special choke manifold, so that downhole pressure is controlled dynamically, the downhole is enabled to be in a controllable unbalanced state all along, accordingly, the quantity of a formation fluid invading a shaft in a snubbing process is controlled effectively, reservoirs of the oil and gas fields can be protected, and the drilling operation safety is guaranteed effectively.

Description

technical field [0001] The invention relates to the technical field of underbalanced drilling in oil and gas fields, and relates to a pressure control device for underbalanced drilling in the whole process and a use method thereof. Background technique [0002] After entering the 21st century, underbalanced drilling technology has developed rapidly, but as far as the current underbalanced drilling technology is concerned, the most common one is still simple underbalanced drilling, which cannot achieve the purpose of protecting oil and gas layers during the entire drilling process. It is mainly reflected in the imperfect tripping operation; in order to avoid complications or accidents such as overflow and blowout, it is necessary to inject heavy slurry into the wellbore to balance the formation pressure before tripping out. Balance state, thus losing the achievement of protecting oil and gas layers during underbalanced drilling. [0003] During the implementation of underbal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B21/08
CPCE21B21/08
Inventor 刘应民伊明杨刚刘永伟
Owner CNPC XIBU DRILLING ENG
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