A QuickFRAC® multi-stage completion system was deployed by an operator in the Middle East and compared with offset plug-and-perf wells in the formation. The QuickFRAC system, a combination of ball-activated limited entry QuickPORT™ V sleeves, dual element RockSEAL® H2 packers and single element swellable packers, initiated more than 20 fractures and achieved the highest initial production among the wells studied.
An operator targeting tight gas reservoirs in the Middle East had been using multi-stage stimulation with cemented plug-and-perf technology and wanted to gain the efficiency of continuous pumping, open hole, ball-activated systems, while maintaining a limited entry design for maximum reservoir coverage.
In typical open hole ball-activated systems, each entry point is isolated with mechanical packers and each stage is treated through one sliding sleeve. The QuickFRAC system, however, enables a more efficient limited entry treatment by using a single actuation ball to open multiple sliding sleeves per stage.
A new configuration of the system was conceived for the lowest cost with maximal operational efficiency and reservoir coverage. In this new configuration, single element swell packers (constrictors) are used between each QuickPORT sleeve within the stage. Since the constrictors are activated through hydrocarbon bonding at the molecular level, no forces or tools are needed for activation. Dual element RockSEAL H2 packers are placed between stages.
Four offset horizontal wells that were completed in the same formation using plug-and-perf, and similar proppant volumes and pumping rates, were used to compare the performance of the QuickFRAC system.
The deployed system consisted of a toe sleeve plus 6 stages. Each stage included 3 entry points, totaling 19 sliding sleeves. The treatment was designed to place 150,000 lb of proppant per sleeve, with low pump rates of about 55 bbl/min per stage. All 7 stages were pumped in a continuous operation as designed.
To evaluate the results of the completion, several tools were used, including a high precision temperature survey and spectral noise logging tool (SNL). The SNL tool records acoustic noise generated by the inflow of liquid and gas at different frequency ranges, with the ability to identify flow and other acoustic information through multiple barriers.
The SNL analysis identified 22 active fractures, 17 of which were offset from a QuickPORT sleeve. Logging results showed the low-pressure constrictors successfully contained the fractures within the compartments, averaging 3 fractures per stage.
Finally, initial production was 32% to 76% higher compared to the offset wells, which had been completed using plug-and-perf.
These results confirm the success of the QuickFRAC system in delivering optimal stimulation operations for limited entry completions. Packers Plus is the innovator of multi-stage fracturing systems, providing field-proven and cost-effective methods for completing horizontal wells with superior production results in numerous formations around the world.
This information was presented at the SPE Annual Technical Conference and Exhibition, Dallas, Texas, 24-26, September 2018 (SPE 191735), and SPE International Hydraulic Fracturing Technology Conference and Exhibition, Muscat, Oman, 16-18 October 2018 (SPE 191442) © 2018 Society of Petroleum Engineers.