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| DGPL®/STRESSFRAC® services cross all conventional lines into different operational entities: |
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| Wireline Service |
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The wireline conveyed technique is the most versatile. It can be combined in one set-up with ongoing operations, such as perforating and logging, either on the initial completion or
re-completions. Efforts to significantly increase the penetration depth and efficiency of jet charges have not met with real success. It is therefore an accepted fact in the industry that perforating itself does not provide efficient communication with the reservoir, nor does it overcome skin damage. It is the practice
in some formations, including gas wells, to follow perforating immediately with a DGPL®/STRESSFRAC® stimulation to generate multiple fractures, 1.5 - 2.5 metres (5-10-ft.) beyond the jet perforator tunnels depth. In fluid sensitive formations, DGPL®/STRESSFRAC® is often conducted under non-damaging fluids, such as liquid CO2, methanol, distillate, etc. In carbonates, the DGPL®/STRESSFRAC® service is frequently performed under acid or may be followed with an acid flush, taking advantage of the DGPL®/STRESSFRAC® induced multiple fracture network. Another application is in injection, disposal, steam, CO2, and water wells to modify the injection profile, increase injectivity, and lower the pressure. In deeper wells, 3962.4 to 5486.4 metres (13,000 to 18,000-ft.), DGPL®/STRESSFRAC® power delivery exceeds surface frac pump capability, which makes it a serious contender in skin damaged zones. |
| Tubing Conveyed Service |
| This mode is appropriate for DGPL®/STRESSFRAC® stimulation in long zones in vertical, deviated, and horizontal wells. The service is performed successfully in a variety of candidates, including open hole and loose, perforated liner completions in lengths of 30.5 to 304.8 metres (100 to 1,000-ft.). |
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DGPL®/STRESSFRAC® material and equipment is essentially modular with a commonality in components, insuring interchangeability in all conveyance modes. This simplifies inventory and distribution. Tubing conveyed STRESSFRAC®, in several configurations and lengths of 30.5 to 121.9 metres (100 to 400-ft.), is used routinely for periodic stimulation in EOR wells with slotted liners and gravel packs. Another application is in long zones in cemented, perforated casing. Multiple separated zones are also treated in one run. In flowing wells, it is advantageous to leave the perforated DGPL®/STRESSFRAC® carriers in the hole as part of the production string. |
| Coiled Tubing Service |
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DGPL®/STRESSFRAC® on coiled tubing with hydraulic firing head is used effectively for combination treatments such as sand control with polymer placement, dispersal, and acid delivery. Selective zone testing by DGPL®/STRESSFRAC® stimulation can be combined with injection of acid or other chemicals, such as scale inhibitors, etc. |
| Special Application Service |
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Under certain conditions, all of the various methods of conveyance may be used alternately. NOTE: Servo-Dynamics' ballistic mechanical peak pressure gauge is used on all DGPL®/STRESSFRAC® operations. In long zones, multiple gauges are spaced at appropriate intervals. |
For technical assistance please contact:
| Gary Loman | (805) 967-3578 | Santa Barbara, California |
| Doug Hartle | (403) 270-0787 | Calgary, Alberta |
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