Method and apparatus for single-trip wellbore treatment

Inactive Publication Date: 2011-09-01
OILTOOL ENG SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]A single trip multizone well treating method and apparatus provides a means to progressively stimulate individual zones through a cased or open hole well bore. The need to drop and mill balls and seats for each zone or run hydraulic control lines from the surface to actuate a series of isolation devices has been eliminated. Also, the I.D. restriction created by balls and seats has been eliminated to provide a full bore completion. The full bore completion allows use of larger perforating guns when thru-tubing perforating is desired. A unique feature of this system is that the operator can progressively treat each zone up the hole by moving the work

Problems solved by technology

This means you can't get adequate pressure to frac the zone or the ball is so weak, the ball blows through the seat.
Furthermore, the small ball seats reduce the I.D. of t

Method used

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  • Method and apparatus for single-trip wellbore treatment
  • Method and apparatus for single-trip wellbore treatment
  • Method and apparatus for single-trip wellbore treatment

Examples

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Embodiment Construction

[0020]With reference to FIG. 1a, a schematic of the present invention shows a 90 degree lengthwise cross-section of the apparatus. This portion of the apparatus is the packer with only a packing element. A packer may be used that has a slip system added and a packer may be used that has a release devise added. Top sub 1 has a connecting thread at the top end 2, an internal thread 3, and o-ring seals 4 and 5. Shear Screws 6 shearably connect Top Sub 1 to Shear Ring 7. Shear Screws 8 shearably connect the Top Sub 1 to Push Sleeve 12. The hole 9 communicates with hole 13. A fitting 10 seals in hole 9 and also connects to hydraulic control line 11. Hole 13 is located inside of Flow Body 14. Seals 15, 16, 4, 5 seal between the Top Sub 1 and the Flow Body 14 to isolate flow paths 9 and 13 from pressure inside the tool 22 or outside the tool 23. Port 20 has Seals 17 and 18 to seal off Port 20 with Push Sleeve 12. Seals 18 and 19 with Push Sleeve 12 seal off port 21 to prevent pressure in t...

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Abstract

The apparatus consists of a tubular housing carried into the well on a workstring. A series of spaced isolation modules is provided for each zone and carried into the well on a tubular conduit. The first, or most downstream module includes first and second sealing mechanisms to isolate the first zone to be treated. A full bore valve is provided that is activated to closed position by an activating component in response to a source of a first level of pressure to isolate the first zone from other parts of the well bore. A port within the housing is initially blocked but selectively opened concurrently with the activation of the first sealing means to manipulate the second sealing mechanism to fully isolate the selected zone and the module. As the module is activated, a second full bore valve is activated to seal the interior of the housing upstream of the first module by manipulation of the tubular string.

Description

CROSS-REFERENCE TO RELATED APPLICATION AND CLAIM OF PRIORITY[0001]This is a utility application claiming priority from U.S. provisional patent application No. 61 / 305,621, filed Feb. 18, 2010, entitled “Method and Apparatus For Single-Trip Wellbore Treatment”, Gregg W. Stout, inventor.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to apparatus and methods for oil and gas wells to enhance the production of subterranean wells, either open hole or cased hole, and more particularly to improved multizone stimulation systems.[0004]2. Brief Description of the Prior Art[0005]Wells are drilled to a depth in order to intersect a series of formations or zones in order to produce hydrocarbons from beneath the earth. The drilled wells are cased and cemented to a planned depth and then may cased and cemented or a portion left open hole. Producing formations intersected with the well bore in order to create a flow path to the surface. Stimulation proce...

Claims

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Application Information

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IPC IPC(8): E21B34/00
CPCE21B23/04E21B33/124E21B43/26E21B43/14E21B34/10E21B23/0411
Inventor STOUT, GREGG W.
Owner OILTOOL ENG SERVICES
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