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Method and system for wellbore debris removal

a technology of debris removal and wellbore, applied in the field of well drilling, can solve the problems of inefficient suction, preventing access to the next operation, and accumulating debris,

Inactive Publication Date: 2019-02-14
WILDCAT OIL TOOLS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011]The disclosed subject matter allows the suction to be achieved using a low-pressure flow area in the annular space to be adjusted for wellbore conditions or suboptimal fluid pumping capacity, allowing customization to a particular drilling situation while remaining strong enough to withstand wellbore operations.

Problems solved by technology

During operations to drill and complete an oil or gas well, debris such as metal cuttings, broken metal or composite parts, pieces of rock, sand, and other unwanted material may obstruct a wellbore and prevent access required for further operations in the wellbore.
The debris may have accumulated in the wellbore due to normal drilling operations or due to the milling of objects such as packers, plugs or stuck tools.
However, haphazard placing of a low pressure, high velocity flow area in relation to return fluid effuse ports or passages—for example, in the annular space—achieves inefficient suction.
Further, current implementations emphasize creating a decrease in pressure and not on making any purposeful use of the kinetic energy inherent in increased fluid velocity.
The nature of coiled tubing operations make it likely that the collection chamber would have very limited segments and additionally that the BHA might not have a means of rotation.
In addition, suction achieved using a low pressure flow area in the annular space cannot be adjusted for wellbore conditions or suboptimal fluid pumping capacity.

Method used

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  • Method and system for wellbore debris removal
  • Method and system for wellbore debris removal
  • Method and system for wellbore debris removal

Examples

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exemplary embodiment 100

[0042]FIG. 2 illustrates an exemplary embodiment 100 of the present invention. In particular, FIG. 2 shows an exterior side view that includes fluid power unit 101 as part of a bottom hole assembly (“BHA”). The BHA includes top sub adapter 120, fluid power unit 101, bottom sub adapter 130, collection chamber 170, and shoe 160. The BHA is inserted into a wellbore on a work string 122 in order to execute wellbore debris removal operations.

[0043]In operation, fluid from a surface pumping system travels through work string 122 and top sub adapter 120 and into tool body 102. The fluid flows through internal passageways within tool body 102 and exits tool body 102 into the annular space of a wellbore. Once the fluid has exited tool body 102 into the annular space, a portion of the fluid travels downward within the annular space, between the wall of the wellbore and the exterior of the BHA, to the area below shoe 160. In the area below shoe 160, the flowing fluid agitates nearby debris, en...

exemplary embodiment 200

[0073]Exemplary embodiment 200 also has the advantage of optional ball-drop-selectable nozzle closure. Such ball-drop-selectable nozzle closure acts to modify fluid stream flow and debris removal force at the point accelerated fluid exits nozzles 216 and exit ports 204.

[0074]As noted above, exemplary embodiment 200 makes use of a plurality of nozzles 216 distributed around the 360-degree circumference of integrated tool body 202. During a debris removal operation, a wide variety of circumstances may be encountered, and the unseen downhole conditions may present unusual challenges to crew conducting the operation. By nature, the unknowns in oil and gas operations incentivize trial-and-error experimentation. Considering the unknown nature of wellbore debris obstructions, and taking into account pressure and flow data, the crew may wish to alter fluid flow within the tool during an operation. Fluid flow may be altered by inserting appropriately-sized balls into the supplied fluid at th...

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Abstract

The present disclosure relates to a method and apparatus for removing debris from a wellbore, comprising providing a surface pump for supplying a fluid stream, a work string fluidly connected to the surface pump for passing the fluid stream from the surface pump, a tool body fluidly connected to the work string, including a plurality of tool body exit ports for passing the fluid stream from the work string into an annular space of the wellbore, and a collection chamber fluidly connected to and downhole from the tool body, for accepting uphole flow of the fluid stream including entrained wellbore debris. The fluid stream including entrained wellbore debris is drawn upward through the collection chamber, and the fluid stream from the work string and the fluid stream from the collection chamber are passed into the annular space of the wellbore. In addition, a cartridge may be inserted into the tool body.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to the following U.S. Non-Provisional patent application Ser. No. 15 / 671,213 filed Aug. 8, 2017 and is incorporated by reference in its entirety.FIELD OF THE INVENTION[0002]The present disclosure relates to the field of well drilling and, more particularly to a method and system for wellbore debris removal.BACKGROUND OF THE INVENTION[0003]During operations to drill and complete an oil or gas well, debris such as metal cuttings, broken metal or composite parts, pieces of rock, sand, and other unwanted material may obstruct a wellbore and prevent access required for further operations in the wellbore. The debris may have accumulated in the wellbore due to normal drilling operations or due to the milling of objects such as packers, plugs or stuck tools.[0004]A common method for wellbore debris removal involves a bottom-hole assembly (“BHA”) employing reverse circulation of pumped fluid, a nozzle or narrow flu...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E21B27/00E21B41/00E21B21/12
CPCE21B41/0078E21B27/005E21B21/12
Inventor ALLEY, MARK F.SAM, BOBBY
Owner WILDCAT OIL TOOLS LLC