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BARRIER FOR GRAVEL PACK APPLICATION

IP.com Disclosure Number: IPCOM000215455D
Publication Date: 2012-Feb-29
Document File: 3 page(s) / 31K

Publishing Venue

The IP.com Prior Art Database

Abstract

SUMMARY This invention is in the field of gravel pack system. It is very common to have a well with a gravel pack installation to prevent the production of sand. Over the years, the length of the gravel pack has increased and is now sometimes covering several reservoirs. This results in water entry in non specific areas of the screen that were not expected to produce water. ICD are trying to solve the issue and create artificial pressure losses for each screen. The pressure loss can be ajusted before running the screen to match the expected formation production. In addition, it is common to have open hole packer (swell) to segment the formation. Unfortunately there are problems with having an open hole packer in a gravel pack situation. The issue is that in gravel pack situation, if there is water that penetrate one section, it can potentially envade the screens around being propagated through the gravel. An embodiment of the invention is then to create barrier between screens in a gravel pack situation to better segment the reservoir. An embodiment of the invention is to have a way to create a barrier between 2 screens in a gravel pack situation once the gravel pack is performed DESCRIPTION AND DRAWINGS OF EMBODIMENTS OF THE INVENTION An embodiment of the invention is to have some chemicals pumped in the gravel that would reduce the permeability of the gravel to create a barrier in the annular space between the base pipe of the screen and the formation. Some chemical are placed in a reservoir. The reservoir is a sub that is screwed between 2 screens. After the gravel pack, pressure is applied inside the sub using the following method: • Service tool moves up and seals against 2 PBR. Pressure is increased inside the service string that will pressure up the sub. • The screens are all sealed with sliding sleeve closed and pressure can be increase in the overall length of the screens. A rupture disc breaks and allow the pressure to compress a piston that expells the chemical in the reservoir out of the sub toward the annular space. Those chemicals will react and reduce the permeability of the gravel pack to create a barrier between the upper and the lower screen. The following drawing is a schematic of an embodiment of the invention: 1. Gravel pack has been performed. 2. The service tool is moving up hole. 3. At a point, an overpool is senced by the crew from surface thanks to the collet system 4. Pressure is applied inside the service tool. That pressure inceases and will break the rupture disc that protect the chamber containing the chemicals. 5. The chemicals are expelled outside creating a low Pressure barrier. 6. Service tool is removed out of hole 7. The upper screen is now isolated from the lower screen. Note that if sliding sleeves are used and can close all the screen section, all rupture discs could be bursted just by increasing the tubing pressure. There is no need for a service tool to pressure up each system any more. Chemical products that could be used in the reservoir: • Epoxy • Bi compound epoxy • Cement • Reactive material with water • Reactive particles with oil • Reactive particle with proppant • Highly viscous fluid that would be very hard to displace through the proppant. • Fluid with very small particles (like fines) to plug the gravel • Fluid with Fibers Method to store the chemicals: • For bi compound system: have each compound stored in a separate bag. When compressed each bag will push the compound out and the 2 compounds will mix together • Have 2 separate pistons Method to propperly position chemicle around the sub: • Have several bags that will have one port fro the chemical to exit. Each port being positionned around the the sub, the entire system will provide the same amount of chemical all around the sub • Have individuals pistons instead of bags • Have a distribution ring to equally distribute the chemicals around the sub. Benefits are: • Simple solution to deploy • Number of barrier can be up to one per screen • Can create a barrier in gravel pack situation • Create a barrier / Isolation between screens • Create a better segmentation of the reservoir • Increase the production • Improve the reservoir drainage Should the screens have sliding sleeves, or check valves, or if by any means, the entire screen section can be pressure up internally, then all the chemicals can be deployed / pumped into the formation in the same time.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 52% of the total text.

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BARRIER FOR GRAVEL PACK APPLICATION

SUMMARY

This invention is in the field of gravel pack system. It is very common to have a well with a gravel pack installation to prevent the production of sand. Over the years, the length of the gravel pack has increased and is now sometimes covering several reservoirs. This results in water entry in non specific areas of the screen that were not expected to produce water. ICD are trying to solve the issue and create artificial pressure losses for each screen. The pressure loss can be ajusted before running the screen to match the expected formation production.

In addition, it is common to have open hole packer (swell) to segment the formation. Unfortunately there are problems with having an open hole packer in a gravel pack situation. The issue is that in gravel pack situation, if there is water that penetrate one section, it can potentially envade the screens around being propagated through the gravel. An embodiment of the invention is then to create barrier between screens in a gravel pack situation to better segment the reservoir.

An embodiment of the invention is to have a way to create a barrier between 2 screens in a gravel pack situation once the gravel pack is performed

DESCRIPTION AND DRAWINGS OF EMBODIMENTS OF THE INVENTION

An embodiment of the invention is to have some chemicals pumped in the gravel that would reduce the permeability of the gravel to create a barrier in the annular space between the base pipe of the screen and the formation.

Some chemical are placed in a reservoir. The reservoir is a sub that is screwed between 2 screens.

After the gravel pack, pressure is applied inside the sub using the following method:


• Service tool moves up and seals against 2 PBR. Pressure is increased inside the service string that will pressure up the sub.


• The screens are all sealed with sliding sleeve closed and pressure can be increase in the overall length of the screens.

A rupture disc breaks and allow the pressure to compress a piston that expells the chemical in the reservoir out of the sub toward the annular space.

Those chemicals will react and reduce the permeability of the gravel pack to create a barrier between the upper and the lower screen.

The following drawing is a schematic of an embodiment of th...