Slim-size port-carrier borehole pressure generator “Plast-36” is used for gas-dynamic fracturing on coil-tubing or wireline to improve hydrodynamic communication with the formation and to increase inflow or injectivity of its bottomhole zone by exposure of combustion products of propellant charges through small-diameter downhole equipment.
Operating Principle:
GDS “Plast-36” is initiated by the hydraulic firing head ISKRA 38 (TOR) when lowered on coil-tubing or the blasting cartridge when lowered on wireline. The initiation results in high-speed combustion of propellant charges causing an instantaneous increase in pressure with the speed up to 10⁴ MPa/s. It leads to gas-dynamic fracture of the formation and to creation of a fracture network in the reservoir within the perforated interval.
Main Technology Components:
Technology for perforation of the injection well stock using a no-workover-team approach (restoration of injectivity):- All operations are carried out by a well-logging crew with a lubricator, tower (crane) or coil-tubing unit;
- Preliminary reperforation by a slim-size gun KPO36 on wireline or coil-tubing;
- Stimulation of the productive interval in several passes by GDS “Plast-36” on wireline or coil-tubing.
Technology Advantages
- Efficient and cost-effective way to significantly increase the injectivity of injection wells without lifting underground equipment;
- Minimum drift diameter of GDS “Plast-36” and the gun KPO36 is 42 mm which allows for using this technology in almost all injection wells;
- Multipurpose software “Plast” for calculation of perforation layout allows for adjustment of all the necessary parameters to achieve maximum effect.
GDS “Plast-36” Specific Features
- No clogging elements in the well after the operation;
- Initiation unit design allows for using a combination of active (with central through channel) and main propellant charges in the stimulation generator;
- A special container for the installation of two standard-design crusher units for advanced pressure analysis during generator operation;
- Generator carrier has 120 holes per 1 meter at phasing 60 degrees which allows for optimal distribution of the gas pressure front in the reperforated interval;
- The length of the generator assembly when lowered on coil-tubing can only be limited by the length of the lubricator lock chamber.
GDS “Plast-36” Technical Characteristics
|
Parameter |
Value | ||
|---|---|---|---|
| Overall diameter, mm |
38 |
||
| Minimum drift diameter for downhole equipment, mm |
42 |
||
| Maximum allowable hydrostatic pressure, MPa | 80 | ||
| Minimum allowable hydrostatic pressure, MPa | 5 | ||
| Maximum allowable temperature, °C, at 2 h hold time | 150±5 | ||
|
Propellant charge weight, kg: - ShGD-27PP; - ShGD-27PP-01 |
140 180 |
||
| Specific volume of gaseous combustion products per one propellant charge ShGD-PP, l/kg, not less | 700 | ||
|
Maximum number of propellant charges in one gun assembly, per trip, pieces: - ShGD-27PP; - ShGD-27PP-01 |
52 1 |
||
|
Maximum interval length perforated per trip, m: - on wireline; - on coil-tubing |
10 Not limited |