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Multilateral Post Completion Well Intervention Method

IP.com Disclosure Number: IPCOM000244310D
Publication Date: 2015-Dec-01
Document File: 1 page(s) / 18K

Publishing Venue

The IP.com Prior Art Database

Abstract

Invention A system and process for drilling a main bore well in a shale field and fracturing of the main bore zone to allow for production of a well for 3 to 5 years or until the well has been depleted to around 30 or so of its original pressure Reentry into the well may occur by cutting a new lateral that would intersect a new portion of the reservoir The new lateral may then be fractured and put on production To establish reentry to the main bore and completion of the well a hollow whipstock i e a combination whipstock and diverter system may be used with a conventional liner hanger packer and production tubing without the need for installation of a multilateral hook hanger or a separately run junction Once the final lateral pressure drop of 30 or so of the original pressure is reached reentry of the well may then occur The casing at each lateral may be opened and all of the laterals commingled with the main bore Artificial lift may be used to produce the well To provide full bore access at all laterals so that plugs placed below each lateral may be removed a lateral exit may be cut at a very shallow angle e g 1 to 3 degrees Milling out the production casing at the exit could be potentially be a problem because mills often want to move downwards into the lateral rather than exiting out of the side of the production casing To overcome this problem a rotationally and axially locked expansion joint may be installed with a collapse length of 20 ft to 40 ft between the upper tie back liner hanger packer and the casing exit When it is desired to gain main bore access the lateral casing may be cut just inside the casing exit using a multistring cutter a standard fishing tool A latching mechanism may then be set in the work string below the expansion joint possibly in an internal profile above the lateral exit The rotationally and axially locked mechanism then may be disconnected and the expansion joint collapsed upward towards the liner hanger Another locking device may be used to axially lock the expansion joint in the collapsed position The movement of the string upwards will pull the bottom of the cut lateral liner out and above the casing exit thus providing full bore access to the hollow whipstock below the exit Any plug installed below the exit in the main bore then may be drilled or removed using standard intervention methods This process may be repeated two or more times until communication between all laterals and the main bore is established An artificial lift mechanism may then be installed and the commingled well put on production Required devices for this method a 20 ft to 40 ft expansion joint a rotational and axially locking mechanism a selective collet or latching mechanism to locate the internal profile in a liner at the rotationally and axially lock mechanism It is desirable that the above operations be performed with wireline or coil tubing

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Multilateral Post Completion Well Intervention Method

Invention:  A system and process for drilling a main bore well in a shale field and fracturing of the main bore zone to allow for production of a well for 3 to 5 years or until the well has been depleted to around 30% or so of its original pressure.  Reentry into the well may occur by cutting a new lateral that would intersect a new portion of the reservoir.  The new lateral may then be fractured and put on production. 

To establish reentry to the main bore and completion of the well, a hollow whipstock (i.e., a combination whipstock and diverter system) may be used with a conventional liner hanger packer and production tubing without the need for installation of a multilateral hook hanger or a separately run junction. 

Once the final lateral pressure drop of 30% or so of the original pressure is reached, reentry of the well may then occur.  The casing at each lateral may be opened and all of the laterals commingled with the main bore .  Artificial lift may be used to produce the well.  To provide full bore access at all laterals so that plugs placed below each lateral may be removed, a lateral exit may be cut at a very shallow angle, e.g., 1 ½ to 3 degrees. 

Milling out the production casing at the exit could be potentially be a problem because mills often want to move downwards into the lateral rather than exiting out of the side of the production casing.  To overcome this problem, a rotationally and axially locked expansion joint may be installed with a collapse length of 20 f...