Schlumberger

Case Study: ACTive Coiled Tubing Services Enable Real-Time MaxCO3 Acid Stimulation Treatment

Middle East operator achieves uniform diversion, higher production in heterogeneous carbonate reservoir

Challenge: Enhance well productivity by stimulating higher-permeability intervals in naturally fractured, high-temperature carbonate reservoir.

Solution: Combine ACTive live downhole coiled tubing (CT) with Jet Blaster jetting scale removal service and MaxCO3 degradable diversion acid to optimize stimulation treatment in real time.

Result: Used real-time monitoring capabilities to optimize diversion and stimulation in a well where diversion treatments were previously impossible.

Operator needed to enhance stimulation in challenging carbonate wells

Wells in this Middle East field are prone to high temperature, uneven zone pressures, and scale  deposition. In addition, wells are located in highly fractured carbonate reservoirs that require  matrix acid stimulation for economic viability. Conventional hydrochloric acid treatments increased productivity, but only marginally. Much of the fluid leaks into massive thief zones instead of creating deep, conductive wormholes. The operator turned to Schlumberger to ensure proper acid placement in difficult-to-reach zones.

Real-time CT enabled accurate, effective diversion and stimulation

Schlumberger bullheaded fiber-laden MaxCO3 Acid system through the annulus to form a temporary barrier against tight zones. Hydrochloric acid was pumped through an ACTive coiled  tubing string. Real-time pressure and temperature measurements from the ACTive service enabled the team to monitor job parameters, such as downhole pressure response, and evaluate the effectiveness of the treatment as it was being performed. The Jet Blaster scale removal service treated scale buildup and allowing the acid to enter understimulated sections.

Even fluid distribution increased production

When MaxCO3 Acid stages reached the formation, bottomhole treating pressure increased, indicating excellent leakoff control and diversion. Production logging showed higher production rates than offset wells stimulated with conventional matrix treatments.


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Real-Time Monitoring Optimizes Diversion and Stimulation

Production logging showed higher production rates than offset wells stimulated with conventional matrix treatments.
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The ACTive real-time downhole coiled tubing services provide accurate downhole measurements, enabling operators to optimize interventions while they are in progress. 
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