Case Study: Wellbore Production - Nigeria 6

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30 Years old and as good as new.

In 1989 an operator drilled a well onshore in Nigeria using water based mud. Over the years the production in the well continued to drop and ultimately oil flow was 0 bbl/day. No further production was forthcoming.

On a number of occasions the well was acidized but all attempts to stir the well to life were in vain. The screen was completely blocked and there was also wax in the tubing.

The SAS Solution

Fast forward to 2019 and SAS Production Services chemistry is called in to try and bring the well back to life. Using our microemulsion chemistry and using our micro-dispersant for the wax the chemicals were put to work via coiled tubing in the well. The chemical blend was pumped down into the reservoir section. Injection into the reservoir was made possible by series of pump and relax sequence until the near wellbore pores opened enough to allow smooth and steady pumping rate into the formation.

After a soak period, the well was opened and measurements were taken to see if our chemistry had brough the oil flow back to life.

Results

Results show that production increased from 0 Bpd to 2,880 Bpd on 32/64” choke and with a BSW of 5%.

It goes without saying that the customer was pleased with the production gain. Four more well are coming up and we will let you know how we get on those wells.

For now, if you want to see what we can do with your well, please do get in touch. We would love to hear from you!

 

From 0 to 1,200 with SAS Breaker

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The story you know - Well Performance

When it comes to well performance every story starts the same. An operator in Nigeria approached us with a well drilled in 1992 using water based mud and with a current production of 0 bbl/day. Over the years production had gradually declined until finally oil flow stopped entirely. The oil for this particular well was quite heavy at 16 API and gas lifts and acid treatments had all come to nothing.

The story we want - Well Stimulation

We love ourselves a challenge and a non-producing well where the competition has not had any results is almost too good a challenge to ignore.


And so the SAS Breaker 162B was called into action. This microemulsion product has shown itself effective around the world from India to the North Sea and the Middle East. This time Nigeria was the destination for the SAS Breaker 162B.

The well itself was a vertical in sandstone. Using a coiled tubing unit the product was placed in the well and left to soak. It restored the near-wellbore permeability by completely removing the near wellbore damage and water-wetting the sand grains.

After the soak period both strings were opened. The short string production increase from 0 Bopd to 450 Bopd (without gas lift), while the long string production increased from 0 Bopd to 750 Bopd (with gas lift). Both strings have 0% BSW.

A completely dead well was revived and brought back to life producing 1,200 barrels of quality oil per day. Not bad for a happy ending!

 

Case Study: Wellbore Production - Nigeria 3

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An operator in Nigeria needed to increase oil production from a vertical well drilled in a sandstone reservoir onshore Nigeria. SAS Production Services provided our microemulsion SAS Breaker 162SC chemistry to completely restore the near-wellbore to its original permeability and increase production. 

The Problem

The well was drilled and put into production in 1993. Oil base mud was used for the drilling of the reservoir section and the well was completed with a screen inside the casing. The oil production rate had continuously declined over the years to 250 bbl/d, and total production (oil and water) declined to 180 bbl/d. The operator was looking for a solution to increase the well production and productivity index.

The SAS Solution

The SAS Breaker 162SC was deployed with coil tubing into the short string and the coil was run in to about 100 ft above the perforation. It was not run to the perforation depth to avoid getting the coil stuck from wrapping around the long string. The chemical blend was semi-bullheaded down into the reservoir section and allowed to soak for the desired period.

It restored the near-wellbore permeability by completely removing the near wellbore damage and water-wetting the sand grains. 

After the soak period, the well was opened and production increased by 476%, from 250 Bopd to 1,440 Bopd. 

To Sum Up...

  • Increased well production from 250 Bopd to 1,440 Bopd on the same choke size. This represents 476% increase (or 5.76 times the pre-treatment rate).

  • Total production increased from 280 bbl/d to 1,440 bbl/d (zero water cut).

  • Productivity of 1,440 Bopd was measured at a separate pressure of 330psi whereas LP tank at the customers facility is at 65psi. Flow rate into the LP tank of 65psi is estimated to be more than 3,000 bbl/d.

Find out more about this case study here:

 

Case Study: Wellbore Production - Nigeria 2

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An operator in Nigeria needed to increase oil production from a horizontal well drilled in a heavy and viscous, low pressure, oil reservoir. SAS Production Services provided our microemulsion SAS Breaker 162SC chemistry to completely restore the near-wellbore to its original permeability and increase production. 

The Problem

The well was drilled in 2014 and oil production had steadily declined to a low value of 98 bbl/d, and total production (oil and water) declined to 110 bbl/d. The operator was looking for a solution to increase the well production and productivity index.

The SAS Solution

The SAS Breaker 162SC was deployed with coil tubing across the reservoir section and allowed to soak for the desired period.

It restored the near-wellbore permeability to its original virgin state by completely removing the damage caused by the drilling mud when the well was drilled, completely removing all the downhole in-situ emulsion that formed during production, and water-wetting all sand grains. 

After the soak period, the well was opened and SAS Breaker 162SC had successfully remediated the horizontal well, removing near-wellbore formation damage and increasing production by 802%, from 98 bbl/d to 886 bbl/d. 

After the well flowed for one month, the operator turned on a gas lift valve and the oil production further ramped up to 1,290 bbl/d.

To Sum Up...

  • Increased well production from 98 bbl/d to 886 bbl/d on the same choke size. This represents 802% increase (or 9.02 times the pre-treatment rate).

  • Total production increased from 110 bbl/d to 1,385 bbl/d.

  • Productivity index increased, enabling a single gas lift valve to increase oil production to 1,290 bbl/d.

Find out more about this case study here:

 

 

Case Study: Wellbore Production - Nigeria 1

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An operator in Nigeria needed to increase oil production from a horizontal well drilling in a heavy and viscous, low pressure, oil reservoir. SAS Production Services provided our microemulsion SAS Breaker 162SC chemistry to completely restore the near-wellbore to its original permeability and increase production. 

The Problem

The well was drilled in 2015 and oil production had steadily declined to a low value of 283 bbl/d, and total production (oil and water) declined to 552 bbl/d. The operator was looking for a solution to increase the well production and productivity index.

The SAS Solution

The SAS Breaker 162SC was deployed with coil tubing across the reservoir section and allowed to soak for the desired period.

It restored the near-wellbore permeability to its original virgin state by completely removing the damage caused by the drilling mud when the well was drilled, completely removing all the downhole in-situ emulsion that formed during production, and water-wetting all sand grains. 

After the soak period, the well was opened and SAS Breaker 162SC had successfully remediated the horizontal well, removing near-wellbore formation damage and increasing production by 259%, from 283 bbl/d to 1,016 bbl/d. 

After the well flowed for one month, the operator turned on a gas lift valve and the oil production further ramped up to 1,620 bbl/d.

To Sum Up...

  • Increased well production from 283 bbl/d to 1,016 bbl/d on the same choke size. This represents 259% increase (or 3.59 times the pre-treatment rate).

  • Total production increased from 552 bbl/d to 1,722 bbl/d.

  • Productivity index increased, enabling a single gas lift valve to increase oil production to 1,620 bbl/d.

Find out more about this case study here: