Production profile evaluation in selective frac completion

Problem Statement

The well produced by ESP with a gross rate of 120m3/d and water cut of 80%. Completion of the well is the 5” selective string across the reservoir zone with 8 frac ports separated by open hole packers. Eight stages hydraulic fracturing job was performed in this well some time ago. The challenge for North Side was to perform Production logging survey in a well-flowing mode using FlowJet pump to lift the well and run MPLT tools for reservoir performance evaluation across ports.

Methodology of Solution

A workover rig was mobilized to the well and pulled ESP. FlowJet pump run into the well. North Side performed production logging survey in static, flowing and transient modes using FlowJet pump as a lifting tool during MPLT. The interpretation of the MPLT results is brought below.

 

MPLT Interpretation Results

As per Temperature transient passes (last right column on the chart) there is no production occurred from Port 1 (all curves merged at Port 1 which indicates that there is no temperature disturbance in reservoir around this area). Production starts from Port 2 which is confirmed by Transient temperature curves (at the point of Port 2 there is a beginning of relaxation related to the temperature disturbance within the port area – inflow point). There is a possible crossflow from Port 2 to Port 4 (also most probably to Port 3) which is seen on transient temperature curves in a well stabilization condition as well as on the static high-resolution temperature pass. During transient passes, there was an effect of descending of oil column (seen on Capacitance curves column, obtained from transient passes) and most possible accepting intervals are Port 4 and 3. At Port 4, there is a clear separation of fluid column on water and oil inside wellbore. The same phenomenon was noticed in well static condition.

As per FBS, Capacitance, Pressure and Temp curves readings, Port 1 doesn’t produce any fluid. The same is confirmed by Static high resolution temperature and Transient high resolution temperature curves. There is no disturbance observed on static and transient temperature curves around Port 1, therefore there is no fluid movement (production) from the Port 1. Port 2, as per FBS and Capacitance, produces water at the rate of 22,5m3/d. Ports 3 and 4 don’t participate in production. It is confirmed by all curves including Pressure, Flowing Temp, Capacitance (no slops on mentioned curves at Ports 3 and 4). However, Port 3 might accept fluid during production, see chart 5 of Stations below. Ports from 5 to 8 produce a mixture of water an oil. Slops on Capacitance and Flowing temperature curves confirm production from mentioned ports.

Workover Solution Based on MPLT & FlowJet Survey Results Interpretation

Based on FlowJet pump production logging survey interpretation results Client closed ports from 1 to 4 which produced water and left ports 5 to 8 for production. Ports were closed at the same workover intervention and new ESP run into the well.

Intervention After Review

After the commissioning of the ESP, the production well test by a mobile separator was done and showed a gross rate of 100m3/d with 40% of WC. Incremental oil production from this intervention was 36m3/d. FlowJet pump & MPLT package gained significant incremental oil production from ESP replacement opportunity.

 

Production Profile Evaluation In Selective Frac Completion


Problem Statement

Well produced by ESP with a gross rate of 120m3/d and water cut of 80%. Completion of the well is the 5” selective string across reservoir zone with 8 frac ports separated by open hole packers. Eight stages of hydraulic fracturing job performed in this well some time ago. Challenge for North Side was to perform Production logging survey in well-flowing mode using FlowJet pump to lift the well and run MPLT tools for reservoir performance evaluation across ports.

Methodology of Solution

Workover rig mobiliZed on the well and pulled ESP. FlowJet pump run into the well. North Side performed production logging survey in static, flowing and transient modes using FlowJet pump as a lifting tool during MPLT. Interpretation of the MPLT results is brought below.

Production logging case study frac ports

As per Temperature transient passes (last right column on chart) there is no production occurred from Port 1 (all curves merged at the Port 1 which indicates that there is no temperature disturbance in reservoir around this area). Beginning of production starts from Port 2 which is confirmed by Transient temperature curves (at the point of Port 2 there is a beginning of relaxation related to the temperature disturbance within port area – inflow point). There is a possible crossflow from Port 2 to Port 4 (also most probably to Port3) which is seen on transient temperature curves in well stabilization condition as well as on static high-resolution temperature pass. During transient passes, there was an effect of descending of oil column (seen on Capacitance curves column, obtained from transient passes) and most possible accepting interval is Port 4 and 3. At Port 4, there is a clear separation of fluid column inside wellbore on water and oil. The same phenomenon noticed in well static condition.

Production logging case study frac ports performance evaluation

As per FBS, Capacitance, Pressure and Temp curves readings, Port 1 doesn’t produce any fluid. The same is confirmed by Static high resolution temperature and Transient high resolution temperature curves. There is no disturbance observed on static and transient temperature curves around Port 1, therefore there is no fluid movement (production) from the Port 1. Port 2, as per FBS and Capacitance, produces water at the rate of 22,5m3/d. Ports 3 and 4 don’t participate into production. It is confirmed by all curves including Pressure, Flowing Temp, Capacitance (no slops on mentioned curves at Ports 3 and 4). However, Port 3 might accept fluid during production, see chart 5 of Stations below. Ports from 5 to 8 produce mixture of water an oil. Slops on Capacitance and Flowing temperature curves confirm production from mentioned ports.

Workover Solution Based on MPLT & FlowJet Survey Results Interpretation

Based on FlowJet pump production logging survey interpretation results Client closed ports from 1 to 4 which produced water and left ports 5 to 8 for production. Ports were closed at the same workover intervention and new ESP run into the well.

Intervention After Action Review

After the commissioning of the ESP, the production well test by mobile separator was done and showed a gross rate of 100m3/d with 40% of WC. Incremental oil production from this intervention was 36m3/d. FlowJet pump & MPLT package gained significant incremental oil production from ESP replacement opportunity.