Scorpion® perforang guns with opposite-paired charge arrangement* are designed for TCP or wireline explosive-perforang operaons in all types of wells.
Innovave method of opposite-paired charge arrangement has been developed to reduce negave explosive-perforang effects on the well, to increase fluid influx compared with classical phasing opons and water-free well producon stage. This opon has the lowest blast effect on the well and does not break its support integrity. Wide range of charges and advantages of Scorpion perforang guns together with opposite-paired charge arrangement allow to considerably expand the range of current geological-engineering objecves. Opposite-paired charge arrangement with standard density is essenal for wells with weak cement support.
Specific Features and Advantages:
- Blast effect inside the gun body is reduced for minimum 20% (proved by testes for the guns with different ulmate stress);
- Blast load on the well support is reduced about twice, under the same condions;
- Formaon coverage and acve zone of each perforated channel are increased;
- Probability of behind-the-casing fluid migraon due to perforaon with subsequent water invasion is reduced;
- Resonance arising from sequenal actuaon of shaped charges is eliminated;
- Formaon compleon with the use of opposite-paired charge perforaon improves efficiency of further smulaon methods such as frac/gas dynamic fracturing
* Protected by the patent №2603792 RF
Characteristics of the Scorpion series perforation systems with paired charge grouping
| Parameter | Value | |||||
|---|---|---|---|---|---|---|
| Perforang gun | Scorpion 73 | Scorpion 89 | Scorpion 102 | |||
| Max allowable operang temperature, 1 hour hold me, °C | 204* | |||||
| Max allowable hydrostac pressure, MPa | 80-140** | |||||
| Outside diameter, mm | Without centralizers, 73 | With centralizers, 102 | Without centralizers, 89 | With centralizers, 113 | Without centralizers, 102 | With centralizers, 131 |
| Min casing diameter, mm | Without centralizers, 88 | With centralizers, 112 | Without centralizers, 106 | With centralizers, 123 | Without centralizers, 119 | With centralizers, 141 |
| Max carrier tube diameter aer perforaon, mm: | ||||||
| in liquid medium; | - 78 | - 94 | - 107 | |||
| in gaseous medium. | - 81 | - 97 | - 110 | |||
| Carrier length, m | 1/2/3/4/5/6 | |||||
| Max length of mul-carrier gun assembly, m: | ||||||
| wireline; | Limited by wireline load capacity | |||||
| TCP | Limited by load capacity of a firing head and a plate | |||||
| Max length of blank carriers | 6 | |||||
| Min zenith angle, degree | 15,9 | 25,9 | 30,3 | |||
| Max borehole dogleg severity, degree/10 m: | ||||||
| for mul-carrier standard gun; | 5,0 | |||||
| for mul-carrier gun with a hinge joint unit (ShUS or ShUS-A), for sections of length: 1/2/3/4 m | 21,5/12,5/6,5/5,0 | |||||
| Phasing orientaon between neighboring charges, degree | 45 | |||||
| Phasing orientaon of opposite-directed charges (α angle),degree | 180 | |||||
| Phasing orientaon between pairs of charges (β angle), degree | 135 | |||||
| Phasing orientaon of 8-charges group (φ angle), degree | 112,5 | |||||
* Max allowable temperature can be limited by max allowable temperature for explosives contained in the perforang gun.
** Max allowable pressure can change depending on the mechanical properes of carrier tubes.
Charge Characteriscs
| Gun name | Charge name | Charge type | Explosive weight per charge, g | Max shot density, shot/m, phasing, degree | Average parameters of charge penetrang force, QC combined target, mm | |
|---|---|---|---|---|---|---|
| Perforaon depth | Casing hole diameter | |||||
| Scorpion 73 | Scorpion PP-20GP | DP | 20 | 20 / 180-135-112,5 | 750 | 11 |
| Scorpion PP-20SGP | SDP | 950 | 10 | |||
| Scorpion PP-20BO | BH | 380 | 17,5 | |||
| Scorpion PP-20SBO | SBH | 210 | 21,5 | |||
| Scorpion 89 | Scorpion PP-25GP | DP | 25 | 20 / 180-135-112,5 | 1000 | 11 |
| Scorpion PP-25SGP | SDP | 1200 | 10 | |||
| Scorpion PP-25BO | BH | 600 | 20 | |||
| Scorpion PP-25SBO | SBH | 250 | 23 | |||
| Scorpion PP-25OP | GH | 600 | 16 | |||
| Scorpion 102 | Scorpion PP-32GP | DP | 32 | 20 / 180-135-112,5 | 1100 | 11 |
| Scorpion PP-32SGP | SDP | 1300 | 10 | |||
| Scorpion PP-32OP | GH | 700 | 17 | |||
| Scorpion PP-32SBO | SBH | 210 | 25 | |||
| Scorpion PP-36SGP | SDP | 36 | 20 / 180-135-112,5 | 1600 | 12 | |
| Scorpion PP-36OP | GH | 1000 | 15 | |||
Phasing Opons and Flat Paerns
