Jet flow adjusting method for rotary steering downhole jam releasing

A technology of rotary steering and jet adjustment, which is applied in the direction of liquid/gas jet drilling, earthwork drilling, flushing of boreholes, etc. It can solve the problems of destroying the surrounding cuttings bed and the unsatisfactory release ability of downhole equipment, etc., and achieves stuck release The effect of strong ability and simple structure

Active Publication Date: 2020-08-07
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the defects and deficiencies in the above-mentioned prior art, the present invention provides a jet regulation method for rotary steerable downhole jam release. Problem, the present invention designs a jet hole with an adjustable area on the drill string of the rotary steerable downhole equipment. When the engineers and technicians think that the debris bed is seriously accumulated in the downhole, an instruction is issued to clarify the split ratio of the jet hole and set the flow rate of the drilling tool. Calculate the area of ​​the equivalent flow path, and calculate the opening area of ​​the jet hole, let a part of the drilling fluid pass through the jet hole, and combine with the rotation of the drill string to form a rotating jet, destroy the surrounding cuttings bed, and realize the release of the rotary steerable tool

Method used

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  • Jet flow adjusting method for rotary steering downhole jam releasing
  • Jet flow adjusting method for rotary steering downhole jam releasing
  • Jet flow adjusting method for rotary steering downhole jam releasing

Examples

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Embodiment 1

[0030] As a preferred embodiment of the present invention, with reference to the attached figure 1 , this example discloses:

[0031] A jet regulating method for downhole jamming of rotary steering, comprising the following steps:

[0032] The ground control system determines the jet hole 2 diversion ratio p according to the cuttings bed cleaning requirements; and sends the jet hole 2 diversion ratio p to the control unit of the downhole rotary steerable system;

[0033] The control unit of the downhole rotary steerable system determines the opening area s of the jet hole 2 according to the definite split ratio p of the jet hole 2 and the equivalent flow channel area S of the drilling tool; the calculation formula is: s=p*S / (1-p) The control unit of the downhole rotary steerable system controls the adjustable bypass valve 3 according to the calculated opening area s of the jet hole 2, controls the overlapping area of ​​the fan-shaped hole 9 on the rotor end 7 and the stator e...

Embodiment 2

[0037] As another preferred embodiment of the present invention, with reference to the attached Figure 1-4 , this example discloses:

[0038] A jet regulating method for downhole jamming of rotary steering, comprising the following steps:

[0039]The surface control system specifies the jet hole 2 diversion ratio p according to the cuttings bed cleaning requirements; and sends the jet hole 2 diversion ratio p to the control unit of the downhole rotary steerable system; the control unit of the downhole rotary steerable system The split ratio p of hole 2 and the equivalent flow channel area S of the drilling tool determine the opening area s of the jet hole 2; the calculation formula is: s=p*S / (1-p); the control unit of the downhole rotary steerable system is obtained according to the calculation The opening area s of the jet hole 2 controls the adjustable bypass valve 3, controls the overlapping area of ​​the fan-shaped hole 9 on the rotor end 7 and the stator end 8, and open...

Embodiment 3

[0042] As another preferred embodiment of the present invention, with reference to the attached Figure 1-4 , this example discloses:

[0043] A jet regulating method for downhole jamming of rotary steering, comprising the following steps:

[0044] The surface control system specifies the jet hole 2 diversion ratio p according to the cuttings bed cleaning requirements; and sends the jet hole 2 diversion ratio p to the control unit of the downhole rotary steerable system; the control unit of the downhole rotary steerable system The split ratio p of hole 2 and the equivalent flow channel area S of the drilling tool determine the opening area s of the jet hole 2; the calculation formula is: s=p*S / (1-p); the control unit of the downhole rotary steerable system is obtained according to the calculation The opening area s of the jet hole 2 controls the adjustable bypass valve 3, controls the overlapping area of ​​the fan-shaped hole 9 on the rotor end 7 and the stator end 8, and ope...

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Abstract

The invention discloses a jet flow adjusting method for rotary steering downhole jam releasing, and relates to the technical field of oil well downhole drilling equipment. The jet hole with the adjustable area is designed in a drill column of the rotary steering downhole equipment, and when engineering technicians consider that an downhole rock debris bed is seriously accumulated, an instruction is issued, the flow dividing proportion of the jet hole is determined, the equivalent runner area of a drilling tool is set, the opening area of the jet hole is calculated, part of drilling fluid passes through the jet hole and is combined with rotation of the drill column, and rotating jet flow is formed to destroy a peripheral rock debris bed, so that the rotary steering tool is jam released. Themethod is easy to control and high in jamming releasing capacity, and the drill jamming problem of the downhole rotary steering tool can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of downhole drilling equipment for oil wells, and more specifically relates to a jet regulation method for downhole jamming of rotary steering. Background technique [0002] During the drilling process, water-sensitive formations such as loose layers, clay, mudstone, and shale will be drilled. In such formations, problems such as expansion, diameter shrinkage, and spalling of the rock formations are prone to occur when they encounter water, which seriously threatens the drilling tools in the well. safety. In the process of drilling in this type of formation, if the mud is slightly used carelessly or in case of a sudden power failure and the mud does not circulate, it is easy to cause sticking. Therefore, when drilling in this formation, the most common problem is sticking and sticking. [0003] With the continuous advancement of shale gas exploration and development, extended-reach wells and horizontal wel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/18E21B31/107E21B21/10E21B21/12
CPCE21B7/18E21B31/107E21B21/10E21B21/12E21B7/065E21B41/0078E21B7/04E21B31/03E21B34/14
Inventor 张继川陆灯云白璟谢意李雷陈科旭黄崇君贾利春张德军李枝林毛斌
Owner BC P INC CHINA NAT PETROLEUM CORP
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