A jet adjustment method for downhole sticking of rotary steerable

A technology of rotary steering and jet adjustment, which is applied in the directions of liquid/gas jet drilling, earthwork drilling, flushing of boreholes, etc. It can solve the problems of unsatisfactory release ability of downhole equipment and damage to surrounding cuttings beds, etc., and achieves a simple structure , The effect of strong card-solving ability

A technology of rotary steering and jet adjustment, which is applied in the directions of liquid/gas jet drilling, earthwork drilling, flushing of boreholes, etc. It can solve the problems of unsatisfactory release ability of downhole equipment and damage to surrounding cuttings beds, etc., and achieves a simple structure , The effect of strong card-solving ability

CN111502547BActive Publication Date: 2021-06-11BC P INC CHINA NAT PETROLEUM CORP +1
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  • A jet adjustment method for downhole sticking of rotary steerable
  • A jet adjustment method for downhole sticking of rotary steerable
  • A jet adjustment method for downhole sticking of rotary steerable

Examples

Experimental program
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Effect test

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 regulating method for downhole jamming of rotary steering, and relates to the technical field of downhole drilling equipment for oil wells. In the present invention, a jet hole with adjustable area is designed on the drill string of the rotary steerable downhole equipment. When engineers and technicians think that the downhole cuttings bed is seriously accumulated, an instruction is issued to clarify the split ratio of the jet hole and set the equivalent of the drilling tool. The area of ​​the flow channel is calculated by calculating the opening area of ​​the jet hole, allowing a part of the drilling fluid to pass through the jet hole, combined with the rotation of the drill string, to form a rotating jet, destroying the surrounding cuttings bed, and realizing the release of the rotary steerable tool. The invention has simple control and strong jamming ability, and can effectively solve the drill jamming problem of the downhole rotary steering tool.

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

Patent Timeline
11 Jun 2021
Publication
CN111502547B
IPC
E21B7/18; E21B31/107; E21B21/10; E21B21/12
CPC
E21B7/18; E21B31/107; E21B21/10; E21B21/12; E21B7/065; E21B41/0078; E21B7/04; E21B31/03
Inventors
张继川; 陆灯云