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Retrieving a subsea tree plug

a tree plug and subsea technology, applied in underwater drilling, drilling machines and methods, borehole/well accessories, etc., can solve the problems of large, complicated operation, and inconvenient use of riser strings,

Inactive Publication Date: 2012-02-23
WILD WELL CONTROL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention relates to a method and apparatus for retrieving a subsea tree plug. The technical effect of this invention is to provide a tool for riserless intervention of a subsea well that can easily and safely engage and disengage the plug of the tree without the need for a riser. This tool includes a pressure control assembly, a plug running tool, and a latch that can securely hold the plug in place during intervention operations. The plug running tool is designed to be easily operated and controlled from the surface, making the intervention process more efficient and safe."

Problems solved by technology

Subsea crude oil and / or natural gas wells frequently require workover to maintain adequate production.
The main disadvantage of this method is the large, specialized MODU that is required to deploy the riser string and the riser string needed to deploy the BOP.

Method used

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  • Retrieving a subsea tree plug
  • Retrieving a subsea tree plug
  • Retrieving a subsea tree plug

Examples

Experimental program
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Embodiment Construction

[0023]FIG. 2A illustrates a pressure control assembly (PCA) 100, according to one embodiment of the present invention. The PCA 100 may include a tree adapter 105, a fluid sub 110, an isolation valve 115, a blow out preventer (BOP) stack 120, a tool housing (aka lubricator riser) 125, a frame 130, a manifold 135, a pod receptacle 140, and one or more accumulators 145 (two shown). The tree connector 105, fluid sub 110, isolation valve 115, BOP stack 120, and tool housing 125 may each include a housing or body having a longitudinal bore therethrough and be connected, such as by flanges, such that a continuous bore is maintained therethrough. The bore may have a large drift diameter, such as greater than or equal to four, five, six, or seven inches to accommodate a bottom hole assembly (BHA) of a workstring (discussed more below) and the crown plugs 56u,l of the tree 50.

[0024]The tree adapter 105 may include a connector, such as dogs 105d, for fastening the PCA 100 to an external profil...

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PUM

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Abstract

A method for riserless intervention of a subsea well includes: lowering a pressure control assembly (PCA) from a vessel to a subsea production tree; fastening the PCA to the tree; deploying a plug running tool (PRT) into the PCA, wherein the PRT comprises a latch, an anchor, and a stroker; engaging the latch with a plug of the tree; engaging the anchor with the PCA; and operating the stroker to pull the latch and the plug from the tree.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims benefit of U.S. Prov. Pat. App. No. 61 / 374,182 (Atty. Dock. No. WWCI / 0014USL), filed Aug. 17, 2010 and U.S. Prov. Pat. App. No. 61 / 408,036 (Atty. Dock. No. WWCI / 0014USL2), filed Oct. 29, 2010, both of which are herein incorporated by reference in their entireties.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]Embodiments of the present invention generally relate to retrieving a subsea tree plug.[0004]2. Description of the Related Art[0005]Subsea crude oil and / or natural gas wells frequently require workover to maintain adequate production. Workover operations may include perforating, gravel packing, production stimulation and repair of a downhole completion or production tubing. During the workover, specialized tools are lowered into the well by means of a wireline and winch. This wireline winch is typically positioned on the surface and the workover tool is lowered into the well through a lubricat...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E21B33/12E21B33/00
CPCE21B33/064E21B33/12E21B33/076
Inventor HOFFMAN, COREY EUGENEUNSGAARD, TOM
Owner WILD WELL CONTROL