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Proactively Addressing Bradenhead Pressure in the DJ Basin December 2019

Stage of Well : WELL INTERVENTION

Identification of problem:

A common issue in the DJ Basin, and throughout the world, is Bradenhead (or surface casing) pressure. It is caused by cement channeling in the production by surface casing annulus and can lead to costly interventions and abandonments over the life of a well. One operator in the DJ Basin decided to address this issue up front, during the original well construction, implementing this proactive solution on all new drill wells going forward.

Issues to overcome:

To avoid disruption to the well and damage to the casing during an intervention, the solution must be implemented before there is an issue, as part of the original casing program.

Application

A Wel-lok M2M TDAP™ is cast onto the outside of a full joint of 5 ½” casing and run in the well as part of the production casing string with a marker joint directly below. This joint is run to a depth above all producing zones in the area to act as the final barrier in the well if/when gas migration occurs. To ensure the bismuth alloy could seal against the open hole formation, when the casing is cemented in place the top of cement is stopped below the casing joint with the cast alloy. If Bradenhead pressure is seen at any time during the life of the well, a BiSN modified thermite heater can be run on wireline inside the casing and activated to melt the alloy and create a V0, gas tight seal in the annulus. By preplacing the alloy in the annuls, the seal can be created rigless without the need to perforate the production casing. The depth of the alloy sleeve can be found by running a CCL and locating the marker joint directly below the alloy.

Outcomes/Conclusion:

A Wel-lok M2M TDAP™ has been successfully deployed in 6 new drill wells to date with further installations ongoing. BiSN awaits the call from the operator to deploy a modified thermite heater and create a seal once Bradenhead pressure is seen.

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Addressing Bradenhead Pressure during Well Construction in the DJ Basin April / September 2019

Stage of Well : WELL INTERVENTION

Identification of problem:

A common issue in the DJ Basin, and throughout the world, is Bradenhead (or surface casing) pressure. It is caused by cement channeling in the production by surface casing annulus and can lead to costly interventions and abandonments over the life of a well. One operator in the DJ Basin decided to address this issue up front, during the original well construction.

Issues to overcome:

To avoid disruption to the well and damage to the casing during an intervention, the solution must be implemented before there is an issue, as part of the original casing program.

Application

A Wel-lok M2M TDAP™ was cast onto the outside of a 5 ½” marker joint of casing and run in the well as part of the production casing string in 10 new drill wells. This joint was run to a depth above all producing zones in the area to act as the final barrier in the well if/when gas migration occurs. To ensure the bismuth alloy could seal against the open hole formation, when the casing was cemented in place the top of cement was stopped below the casing joint with the cast alloy. If Bradenhead pressure is seen at any time during the life of the well, a BiSN modified thermite heater can be run on wireline inside the casing and activated to melt the alloy and create a V0, gas tight seal in the annulus. By preplacing the alloy in the annuls, the seal can be created rigless without the need to perforate the production casing. The depth of the alloy sleeve can be found by running a CCL and locating the marker joint.

Outcomes/Conclusion:

A Wel-lok M2M TDAP™ was successfully deployed in each of the 10 new drill wells. BiSN awaits the call from the operator to deploy a modified thermite heater and create a seal once Bradenhead pressure is seen.

Well Intervention
Well Intervention

Field Trial Angola December 2016

Stage of Well : WELL INTERVENTION

Following the success of the field trial in the Gulf of Mexico, BiSN were invited to Angola to provide water shut off technology to two under performing wells.

Identification of problem:

Provide a seal in the production string and annulus to shut off a lower water producing zone. (Read more about annular seals)

Well 1 was producing approximately 3,600 bopd with 70% water production
Well 2 was producing 100% water with no oil production

Issues to overcome:

Traditional methods of reducing water production from a well included setting multiple bridge plugs in the production string or perforating the production string and squeezing cement or a resin. Bridge plugs only baffle the water, slowing it down but not stopping it, as they cannot seal the annulus outside of the production string. Resins require perforations to access the annulus, damaging the production string.

Application

Wel-lok M2M™ WSO (water shut off tool) was set in both the wells as follows:

Well 1 - Wel-lok M2M™ WSO was set inside of a 5.5” OD screen and sealed inside a 9.5” ID open hole

Well 2 - Wel-lok M2M™ WSO was set inside of a 5” OD screen and sealed inside an 8.5” ID open hole

Outcomes/Conclusion:

Well 1 – After 2 months of production, water production has decreased from 70% to 54% and oil production has increased from 3,600 bopd to 5,000 bopd

 

Well 2 – After 2 months of production, water production has decreased from 100% to 45% and oil production has increased from 0 bopd to 1,300 bopd

 

Both Well Intervention jobs were deemed a huge success by the operator, particularly Well 2 that had previously been shut in due to lack of production. The operator has since discussed with BiSN opportunities to run their tools, WSO as well as others, in additional wells throughout the world.