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Variable-diameter stabilizer and variable-diameter stabilizer system

A stabilizer and shell technology, applied in the field of variable diameter stabilizers and their systems, can solve the problems of recording mud pressure, impact of drilling work, and inability to accurately know the working status of variable diameter stabilizers, so as to reduce pressure and ensure safety reliable effect

Active Publication Date: 2013-04-03
四川伟创石油装备制造有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, when the above-mentioned mud pressure changing device is used, when the variable diameter stabilizer is in the drilling working state, the distance between the central hole in the orifice plate assembly and the mushroom head assembly is the smallest, and the mud pressure is relatively highest; therefore, the variable diameter will be stable. The variable diameter stabilizer is in a high-pressure state, and because the variable diameter stabilizer needs to be in the drilling working state for a long time, it is easy to cause damage or even damage to the variable diameter stabilizer, so that ground operators cannot monitor and record the mud pump through the mud pump pressure gauge. If the mud pressure is low, the working status of the variable diameter stabilizer cannot be accurately known, which will affect the drilling work

Method used

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  • Variable-diameter stabilizer and variable-diameter stabilizer system

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Embodiment 1

[0045] Such as figure 1 and figure 2 As shown, the variable diameter stabilizer provided in this embodiment includes a casing 1, an upper mandrel 2 and a lower mandrel 3, and an upper high-pressure mud chamber 21 is formed inside the upper mandrel 2 along the axial direction of the casing 1, The inside of the lower mandrel 3 is formed with a lower high-pressure mud chamber 31 along the axial direction of the shell 1, the lower end of the upper mandrel 2 is connected and fixed to the upper end of the lower mandrel 3, and the upper high-pressure mud chamber 21 communicates with the lower high-pressure mud chamber 31 ; Also includes a mud pressure changing device 4, the mud pressure changing device 4 is composed of a mushroom head assembly 41 and a central hole 42, the central hole 42 is arranged on the top of the upper mandrel 2, and the diameter of the upper end of the central hole 42 is greater than the diameter of the lower end, the center The hole 42 communicates with the ...

Embodiment 2

[0075] Due to the variable diameter stabilizer, when judging its working state, it is usually to observe the change of the degree of the pressure gauge on the mud pump. However, since the variable-diameter stabilizer usually operates several thousand meters below the ground, the pressure in the variable-diameter stabilizer will attenuate to a large extent when it is transmitted to the ground. For example, when the pressure of the mud changes around 2 MPa, the pressure signal is attenuated in the upload and the strong vibration of the drill floor will make it impossible for the ground operator to accurately read the pressure change of the pressure gauge. Therefore, in order to directly observe the change of the pressure gauge degree on the ground, the mud pump is often required to increase the pressure of mud injection, so as to offset the influence caused by the pressure attenuation. As a result, the mud pressure in the variable diameter stabilizer often exceeds the normal dri...

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Abstract

The invention provides a variable-diameter stabilizer. The variable-diameter stabilizer comprises a housing, an upper mandrel and a lower mandrel, wherein an upper high-pressure mud cavity is formed in the upper mandrel in the direction of the axial line of a housing, a lower high-pressure mud cavity is formed in the lower mandrel in the direction of the axial line of the housing, the variable-diameter stabilizer further comprises a mud pressure changing device, the mud pressure changing device comprises a mushroom head assembly and a center hole, the center hole is formed in the upper end of the upper mandrel, the diameter of the upper end of the center hole is larger than that of the lower end, and the center hole is communicated with the upper high-pressure mud cavity; the mushroom head assembly is arranged above the center hole and fixed on the inner wall of the housing; and when the variable-diameter stabilizer is positioned in a working state, the area of passage of mud at the mushroom head assembly and the center hole is maximum, the pressure born by the variable-diameter stabilizer in the working state can be effectively reduced, and the variable-diameter stabilizer is safe and reliable. The invention further provides a variable-diameter stabilizer system, which can effectively reduce the pressure born by the variable-diameter stabilizer in the working state, and the variable-diameter stabilizer is safe and reliable.

Description

technical field [0001] The invention relates to the technical field of petroleum and geological drilling equipment, in particular to a variable-diameter stabilizer and a system thereof. Background technique [0002] As everyone knows, when oil extraction or geological prospecting, often need to carry out drilling well underground with drill bit. Because in some oil exploration or geological exploration, its drilling depth can reach several thousand meters. In the drilling process, in order to ensure the quality of drilling and the safety of the drill bit and drill pipe, it is often necessary to control the inclination angle of the drilled hole within a certain range, that is, to ensure that the drill bit is drilled according to the preset trajectory . [0003] At present, in order to ensure the inclination angle of the wellbore, people often install a variable diameter stabilizer on the top of the drill bit, and use the variable diameter stabilizer to fit the inner wall of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/04
Inventor 王岳马天立
Owner 四川伟创石油装备制造有限公司
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