Gain of 180m3/d by MPLT & FlowJet Pump Package

 

Problem Statement

Challenge: Understand the reason for low reservoir performance. Optimize production.

Artificially produced wells can’t be logged by the Production logging survey for reservoir performance evaluation unless Y-tool or Dual Wellhead is part of well completion. The presented case study is an ESP well with a gross rate of 60 m3/d and WC of  5%. The reservoir zone consists of 5 perforation intervals. When ESP failed, Workover Rig was sent to the well to replace ESP. Thus, it was an opportunity to perform Production Logging Services through the FlowJet pump for reservoir performance evaluation.

Methodology of Solution

A ESP pump was pulled by workover rig and FlowJet pump run in hole on workover rig tubing. Production logging survey was performed by North Side Production Logging Tools in Static, Flowing and Transient modes at different flowing regimes (drawdown) created by FlowJet pump. MPLT interpretation results were delivered to the Client in 12 hours after completion of the logging.

 

MPLT Interpretation Results

High Resolution Static Temperature curve is interpreted against simulated Geothermal gradient. Static temperature curve captures and represents “Historical” performance of reservoir showing the most historically produced intervals derived from heating/cooling anomalies created by the reservoir fluid and processes within reservoir during production. As per SHRT survey there is a strong crossflow inside the casing in a well static condition from interval 2225-2231m to the intervals 2473-2475m and 2478-2488m. The oil level was determined at 1200m from the surface. The water level was determined at 2481m from the surface.

Based on interpretation of data obtained in a well flowing mode, there is a crossflow of pure oil from intervals 2225-2231m, 2307-2310m, 2434-2437m, 2473-2476m to the interval 2478-2488m (thief zone). Rate of crossflows was 180m3/d. Production rate of FlowJet pump during MPLT survey was 60m3/d and couldn’t get higher. Basically, ESP rate during a well production stage was also 60m3/d which is very good matching of regimes created by ESP and FlowJet pump. Therefore, strong oil crossflow inside the wellbore to the thief zone impacted optimal performance of the well.

Workover Solution Based on MPLT & FlowJet Survey Results Interpretation

Based on production logging interpretation results, Client decided to install a bridge plug above interval 2478-2488m to isolate a thief zone. Then, a bridge plug installation was done, a new ESP was run into the well. After commissioning of ESP the production rate increased up to 230m3/d of gross with water cut of 5%. The gain after workover intervention reached 180 m3/d of oil.

Cost Saving “SINGLE INTERVENTION” Optimization Solution

Production logging service with FlowJet pump is run on opportunity basis when, for example, a pump fails and workover rig is sent for a pump replacement. Therefore, it is a great opportunity to improve well-reservoir performance at the same pump replacement intervention. FlowJet pump lifts the well during production logging, North Side delivers interpretation of MPLT data in 8-12 hours and then a workover rig can perform optimization on the reservoir based on MPLT logging outcome. Thus, a new pump (ALS) will be run into the already optimized well.

Gain of 180m3/d by MPLT & FlowJet Pump Package


Problem Statement

Challenge: Understand the reason for low reservoir performance. Optimize production.

Artificially produced wells can’t be logged by the Production logging survey for reservoir performance evaluation unless Y-tool or Dual Wellhead is a part of well completion. The presented case study is an ESP well with a gross rate of 60 m3/d and WC of  5%. The reservoir zone consists of 5 perforation intervals. ESP failed and Workover Rig was sent to the well to replace ESP. Thus, it was an opportunity to perform Production Logging Services through the FlowJet pump for reservoir performance evaluation.

Methodology of Solution

A ESP pump was pulled by workover rig and FlowJet pump run in hole on workover rig tubing. Production logging survey performed by North Side Production Logging Tools in Static, Flowing and Transient mode at different flowing regimes (drawdown) created by FlowJet pump. MPLT interpretation results delivered to the Client in 12 hours after completion of the logging.

Production logging with Jet pump case study

High Resolution Static Temperature curve is interpreted against simulated Geothermal gradient. Static temperature curve captures and represents “Historical” performance of reservoir showing the most historically produced intervals derived from heating/cooling anomalies created by the reservoir fluid and processes within reservoir during production. As per SHRT survey there is a strong crossflow inside a casing in well static condition from interval 2225-2231m to the intervals 2473-2475m and 2478-2488m. Oil level determined at 1200m from surface. Water level determined at 2481m from surface.

Production logging with Jet pump case study crossflow

Based on interpretation of data obtained in well flowing mode, there is a crossflow of pure oil from intervals 2225-2231m, 2307-2310m, 2434-2437m, 2473-2476m to the interval 2478-2488m (thief zone). Rate of crossflows is 180m3/d. Production rate of FlowJet pump during MPLT survey was 60m3/d and couldn’t get higher. Basically, ESP rate during well production stage was also 60m3/d which is very good matching of regimes created by ESP and FlowJet pump. Therefore, strong oil crossflow inside casing to the thief zone impacted optimal performance of the well.

Workover Solution Based on MPLT & FlowJet Survey Results Interpretation

Based on production logging service interpretation results, Client decided to install bridge plug above interval 2478-2488m to isolate a thief zone. Then, a bridge plug installation was done, a new ESP was run into the well. After commissioning of ESP the production rate increased up to 230m3/d of gross with water cut of 5%. Gain after workover intervention was 180 m3/d of oiL.

Cost Saving “SINGLE INTERVENTION” Optimization Solution

Production logging service with FlowJet pump is run on opportunity basis when, as an example, pump failed and workover rig is sent for pump replacement. Therefore, it is great opportunity to improve well performance at the same pump replacement intervention. FlowJet pump lifts the well during production logging, North Side delivers interpretation of MPLT data in 8-12 hours and then workover rig could perform optimization with reservoir based on MPLT logging outcome. Thus, new pump (ALS) will be run into already optimized well.