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Reliable Rock to Rock Barrier in complex well P&A with Control lines

IP.com Disclosure Number: IPCOM000247953D
Publication Date: 2016-Oct-13
Document File: 1 page(s) / 6K

Publishing Venue

The IP.com Prior Art Database

Abstract

To aid with the plug and abandonment of complex wells with control line in place, a process will be developed to significantly reduce time and complexity. The concept will involve chemically dissolving control line encapsulation, circulating it out of the well and cementing through control line internal diameters to achieve a permanent wellbore barrier.

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Reliable Rock to Rock Barrier in complex well P&A with Control lines

To aid with the plug and abandonment of complex wells with control line in place, a process will be developed to significantly reduce time and complexity. The concept will involve chemically dissolving control line encapsulation, circulating it out of the well and cementing through control line internal diameters to achieve a permanent wellbore barrier.

The first step is to establish through-tubing injectivity into the reservoir to isolate the perforation. Once injectivity is established, the formation can now be squeezed off with cement.

The control line will then be flushed to prepare it for micro cementing. To access the annuli between the completion tubing and the production casing (A annulus), a sliding sleeve will be opened or a tubing punch operation will be performed to establish communication.

Next, circulate a specially formulated chemical compound into the well to dissolve the control line encapsulation and then circulate it out of the well. This will be followed by the circulation of a cement plug to isolate the A annulus and tubing internal diameter. An ultra-fine cement slurry will then be injected into the control line internal diameter to fully establish an across-the- wellbore barrier.

To establish communication with annuli higher in the wellbore, a perforating gun may be used to establish communication for secondary wellbore isolation.

Lastly, a short section of the completion...