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Heave Compensator for Constant Force Application to a Borehole Tool

a constant force application and compensator technology, applied in the direction of borehole/well accessories, drilling casings, drilling pipes, etc., can solve the problems of large heave compensation systems, adversely affecting the longevity of the tool, and affecting the cutting inserts of the mill, so as to prevent damping responses and ensure uphole force

Inactive Publication Date: 2017-11-09
BAKER HUGHES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The compensating device described in the patent allows for steady operation of a milling tool in a drilling machine. It uses a differential piston area to create a net uphole force from backpressure, which ensures that the tool stays in place during use. The device can also be reversed for applications that require a net down force during milling. This compensating device helps to maintain a stable and efficient drilling process.

Problems solved by technology

Some borehole procedures such as section milling are sensitive to load variations which could adversely affect the cutting inserts on the mill.
These systems are not sensitive enough to stop all the force variations at the borehole tool, which can adversely affect the longevity of the tool.
Heave compensation systems are large and very complex as illustrated in U.S. Pat. No. 3,905,580; US 2016 / 0039643; and U.S. Pat. No. 9,267,340.

Method used

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  • Heave Compensator for Constant Force Application to a Borehole Tool
  • Heave Compensator for Constant Force Application to a Borehole Tool
  • Heave Compensator for Constant Force Application to a Borehole Tool

Examples

Experimental program
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Embodiment Construction

[0010]Referring to FIG. 1, there is a mandrel 10 having a passage 12 and lateral ports 14. An outer housing 16 surrounds the mandrel 10 and has ports 18 leading to a surrounding annular space 20. A vessel is schematically illustrated as V rides on the water and likely has a heave compensator on board to minimize the movement seen at connection 22 to the mandrel 10. Seals 24 and 26 are different diameters and define a variable volume chamber 28 between the outer housing 16 and the mandrel 10. Pressure applied to passage 12 communicates with chamber 28 to create a net force in the direction of arrow 30 on the outer housing 16. This happens because the piston areas 32 and 48 see passage 12 pressure for a force in the direction of arrow 30 and that force is opposed by pressure in the annulus 20 which is usually far lower acting on surfaces 50 and 52. Ports 18 communicate variable volume chamber 38 with the annular space 20 so that the mandrel 10 does not get liquid locked in housing 16....

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Abstract

The compensating device has a through passage that goes to the borehole tool. There is a lateral passage to a piston housing. Through the use of a differential piston area on the outer housing, a net uphole force results from backpressure as a result of flow pumped through a section mill that mills in an uphole direction. If the vessel goes down the mill is just pushed away from the tubular being cut. If wave action takes the vessel up fluid is displaced back into the mandrel but the constant force up that is dependent on the existing backpressure in the tubing keeps a steady uphole force on the mill. The tool can be reversed for applications that require a net down force during milling. Rotational locking between the mandrel and the outer housing can be used. Ports are sized to prevent damping responses.

Description

FIELD OF THE INVENTION[0001]The field of the invention is a compensating device that maintains a constant axial force on a borehole tool responsive to internal pressure in the tool created by fluid pumped through the compensating device and bound for the borehole tool.BACKGROUND OF THE INVENTION[0002]Some borehole procedures such as section milling are sensitive to load variations which could adversely affect the cutting inserts on the mill. Floating vessels are subject to wave action and frequently contain heave compensation devices to even out the up and down motion of the vessel in response to wave action. These systems are not sensitive enough to stop all the force variations at the borehole tool, which can adversely affect the longevity of the tool. Heave compensation systems are large and very complex as illustrated in U.S. Pat. No. 3,905,580; US 2016 / 0039643; and U.S. Pat. No. 9,267,340. Thrusters are used as compensation device during drilling as illustrated in US 2001 / 00453...

Claims

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Application Information

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IPC IPC(8): E21B17/07E21B29/12
CPCE21B29/12E21B17/076E21B19/09
Inventor HERED, WILLIAM A.CULLUM, JASON L.
Owner BAKER HUGHES INC