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Sliding Sleeve Valve Mechanical Shifting Tool (MST)

IP.com Disclosure Number: IPCOM000189101D
Publication Date: 2009-Oct-28
Document File: 5 page(s) / 140K

Publishing Venue

The IP.com Prior Art Database

Abstract

Sliding sleeve valves in production tubing or casing allow selective multi-zone operations though the tubing or casing. Opening the sleeve permits zonal stimulation through the selected tool and diverts the flow through the ports in the sliding sleeve valve. After stimulation, clean up is assisted by flowing all zones simultaneously. The sleeves can be operated by either a mechanical or hydraulic shifting tool run on either jointed pipe or coiled tubing (CT), or by using a ball drop system.

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Sliding Sleeve Valve Mechanical Shifting Tool (MST)

Abstract

Sliding sleeve valves in production tubing or casing allow selective multi-zone operations though the tubing or casing. Opening the sleeve permits zonal stimulation through the selected tool and diverts the flow through the ports in the sliding sleeve valve. After stimulation, clean up is assisted by flowing all zones simultaneously. The sleeves can be operated by either a mechanical or hydraulic shifting tool run on either jointed pipe or coiled tubing (CT), or by using a ball drop system.

This paper discusses the design objectives, the unique features and the application of the MST.

Discussion

This invention is a Mechanical Shifting tool (MST) for a window type sliding sleeve system that is installed on a completion in a customer well. This allows for sliding sleeve valve systems to have a wider scope of application when used in conjunction with multistage fracturing techniques.

The MST is designed to selectively open and close a sliding sleeve valve at any position in the well without shifting any others. It is attached to coiled tubing or jointed pipe and actuated hydraulically.

The MST was developed with the following needs in mind:

Perform multiple fracture treatments in a single trip into the wellbore via coiled tubing or jointed pipe .

Enable placement and isolation of the stimulation treatment.

Reduce completion cycle time and improve production.

Reduced risk of multiple fractures in deviated and horizontal wells.

Deep well interventions.

Improve safety.

MST Design Objectives

The updated tool is designed based on the following criteria:

Can be used with CT and Jointed Pipe.

Tool ID designed for pumping proppant laden fluid (up to 20ppg) through the tool at up to a velocity of 35ft/sec through the coil.

Tool OD designed to allow for fluid to flow around and/or past the tool with minimal friction.

Activate the keys by creating a pressure differential across the tool by pumping down the coiled tubing or jointed pipe.

Alternative - Activate the keys by pumping a ball to then pressure up on the tool.

If ball drop activation, the ball seat is to be hardened and impact resistant to deal with high rates and high proppant concentration.

If ball drop activation, the ball is to be small enough to run through 2" coil and entire bottom hole assembly (BHA).

During fracturing the BHA is open ended allowing liquid sand to be pumped though.

Can be run as part of the BHA.

Use a single shortened tool to open and close the sleeves by designing a key that when activated can open and close.

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On opening the tool the keys are designed to stay engaged to the sleeve until pressure is released on the tubing to retract.

On closing the sleeve the keys are designed to auto release, therefore once the sleeve is fully closed normal string weight will b...