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STIMULATION

BackStopSM Service New Slurry Squeeze System Designed Primarily for Water Shutoff – Does Not Require Zonal Isolation or Drillout

BackStop service helps control unwanted water production by placing a highly effective water control agent only a short distance into the formation around perforation tunnels. The new BackStop system offers several advantages:

Production Casing

Production Casing

Borehole

Production Tubing

Cement Borehole Gelled Filtrate

Hydrocarbon Producing Perfs

• No need for zonal isolation as with standard sealant operations - slurry is bullheaded into all open perforations. With BackStop service the entire wellbore in the selected interval can be filled with the slurry and squeezed.

Water Producing Perfs

Cement

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1

• Shallow penetration of the filtrate allows for reperforation in the hydrocarbon zone

Production Casing

• Unlike cement, BackStop slurry left in the hole does not have to be drilled out but can be easily jetted out with coiled tubing.

Coiled Tubing

Gun

Gelled Filtrate

Gelled Filtrate

Cement

Cement

Borehole

• Reperforation is an option. • Bottom hole temperature of 70 to 350° F (21 to 177° C).

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4

The BackStop service process. (1) Some perforations produce hydrocarbon and some produce water. (2) BackStop agent is bullheaded across all perforations. (3) After setting up, excess BackStop agent in the wellbore is washed out. (4) New perforations are created in nonwater-producing zones.

H2Zero Service Technology is the Key BackStop service is based on a slurry formed by combining Halliburton’s proven H2Zero agent and fluid loss control additives. H2Zero service uses a revolutionary polymer system to provide unprecedented capabilities for controlling unwanted water production. Operators have found that the organically crosslinked H2Zero system is simply one of the most cost-effective polymer sealant systems available. When pumped and squeezed, the fluid loss particles in the BackStop system will create a diverting filter cake resulting

in a uniform and shallow placement of the H2Zero polymer. Penetration into the formation is typically less than 3 in. During the process, the H2Zero polymer used as make-up water for the slurry will be squeezed into the formation creating a shallow matrix water shut off after it has set. Selective perforation of the hydrocarbon zones can re-establish the oil production. Additionally, the shut-off zones can be reopened later in the life of the well when artificial lift has been installed.

HALLIBURTON

HAL24782

Borehole

Candidate Wells BackStop service is applicable to any well with these conditions: • Zonal isolation of the offending water/gas zone is not feasible.

Production Casing

BackStop Service Compared to Cement Squeeze Treatments Although similar to cement squeezes, BackStop service provides several advantages: • No drill out required • Filtrate forms seal several inches radially around the exposed wellbore On the other hand, cement presents the following disadvantages: • Drill out required • Cement cannot penetrate formation or micro-fissures • Micro-annulus can form Unlike cement squeezes, with BackStop service the filtrate is the key to treatment success. Following placement of the slurry, pressure is slowly applied by pumping an appropriate displacement fluid (water, brine, etc.) until a volume corresponding to 1-3 in. penetration of the interval has been pumped.

Case History Operator’s Challenge In the Middle East, a dual completion well began to produce excessive water. After 11 years’ production, the water cut in the lower zone increased to 96%. A production logging tool (PLT) survey showed the two middle perforated sections in the zone produced most of the water and that water cross flow between these two

sections occurred when the well was closed in. Isolating the watered-out section in the top of the lower zone with mechanical means was not possible because of the dual completion installed in the well. Also, a workover to install a cemented completion inside the existing perforated liner was not possible because of the existing 4-1/2-in.-liner. The problem interval in the well was 610 ft (186 m) long with a bottomhole temperature of 298º F (148 °C).

Halliburton’s Solution Halliburton implemented BackStop service to achieve a shallow penetration of H2Zero agent in the perforation tunnels. After the BackStop slurry was bullheaded into the wellbore, the well was shut in to allow the slurry to set up. The set-up BackStop agent was then easily jetted out of the wellbore with coiled tubing.

Results Following the treatment, a PLT survey indicated clearly that the squeezed zone was not contributing to the water production. The zone was reperforated and production resumed, virtually water free.

Other Applications BackStop service should be considered as an alternative to many other standard cement squeeze operations in addition to shutting off unwanted water, such as repairing casing leaks and sealing off thief zones, lost-circulation zones or near wellbore channels.

For more information about how BackStopSM service can help control your water production problems, contact your local Halliburton representative or email [email protected].

www.halliburton.com H04796 10/08 © 2008 Halliburton All Rights Reserved Printed in U.S.A.

Sales of Halliburton products and services will be in accord solely with the terms and conditions contained in the contract between Halliburton and the customer that is applicable to the sale.

HALLIBURTON