Paired arrangement of charges in the gun
Scorpion® perforang guns with opposite-paired charge arrangement* are designed for TCP or wireline explosive-perforang operaons in all types of wells.
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Paired arrangement of charges in the gun
Scorpion® perforang guns with opposite-paired charge arrangement* are designed for TCP or wireline explosive-perforang operaons in all types of wells.
The innovative PCG (paired charge grouping) methodology was developed to reduce the negative consequences of perforating and blasting operations for wells, increase fluid inflow compared to classic phasing options, and extend the water-free operation period of the well. It exerts the least explosive impact on the well, without compromising the integrity of its cement sheath. A wide range of charges and the advantages of Scorpion perforating systems combined with PCG allow significantly expanding the spectrum of geological and technical tasks to be solved. The use of PCG with standard density is relevant for wells with a weak cement sheath.
Features and advantages
Features and advantages
- The explosive impact inside the perforator is reduced by at least 20% (established by tests with different yield strengths of perforator carriers);
- The explosive load on the well cement sheath is reduced by approximately 2 times under the same conditions;
- Formation coverage and the drainage area of each perforation tunnel are increased;
- The probability of behind-casing fluid crossflows due to perforation, and consequently early well watering out, is reduced;
- The resonance occurring during the sequential detonation of shaped charges is eliminated;
- Formation penetration with PCG increases the efficiency of subsequent known methods of formation stimulation, such as HF/HDF (hydraulic/hydro-dynamic fracturing).
Characteristics of Scorpion series perforating systems with paired charge grouping
| Parameter | Value | |||||
|---|---|---|---|---|---|---|
| Scorpion 73 | Scorpion 89 | Scorpion 102 | Scorpion 114 | |||
| Outer diameter, mm | ||||||
| - without installed centralizers | 73 | 89 | 102 | 114
Scorpion 102
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| - with installed centralizers | 102 | 113 | 131 | 138
Scorpion 102
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| Minimum drift diameter, mm | ||||||
| - without installed centralizers | 88 | 106 | 119 | 143
Scorpion 102
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| - with installed centralizers | 112 | 123 | 141 | 148
Scorpion 102
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| Maximum allowable operating temperature, when held for 1 hour, °C | (170-200)±51) | |||||
| Maximum allowable hydrostatic pressure, MPa | 80-1402) | |||||
| Maximum carrier diameter after perforator firing, mm: | ||||||
| in a liquid environment | 78 | 94 | 107 | 120
Scorpion 102
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| in a gas environment | 81 | 97 | 110 | 120
Scorpion 102
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| Section length, m | 1/2/3/4/5/6 | |||||
| Maximum length of a multi-section perforator assembly, m: | ||||||
| on wireline | Limited by the cable load capacity | |||||
| on tubing | Limited by the load capacity of the firing head and plate | |||||
| Maximum length of blank sections | 6 | |||||
| Maximum wellbore dogleg severity, deg/10 m: | ||||||
| for a multi-section perforator of standard design | 5.0 | |||||
| for a multi-section perforator using articulated joint assemblies (SHUS or SHUS-A): for sections 1/2/3/4 m long | 21.5/12.5/6.5/5.0 | |||||
| Phasing between adjacent charges, deg. | 45 | |||||
| Phasing of oppositely directed charges (angle α), deg. | 180 | |||||
| Phasing between charge pairs (angle β), deg. | 135 | |||||
| Phasing of a group of 8 charges (angle φ), deg. | 112.5 | |||||
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1) The maximum allowable operating temperature and holding time of the loaded perforator are determined by the operational documentation for the EM (explosive materials) having the lowest allowable application temperature compared to the other EMs included in the explosive train of the perforator, as well as by the characteristics of the rubber products used. 2) The maximum allowable pressure may vary depending on the mechanical properties of the carrier tubes. |
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Characteristics of the applied charges
| Perforator name | Shaped charge name | Charge type | Total explosive mass in the charge, g1) | Perforation density, shots/m/ phasing, deg. |
Average parameters of charge penetration performance into a QC-type composite target, mm | |
|---|---|---|---|---|---|---|
| Penetration depth | Entrance hole diameter | |||||
| Scorpion 73 | Scorpion PP-20DP | DP | 14.3-16.8 | 20/ 180-135-112.5 |
750 | 11 |
| Scorpion PP-20SDP | SDP | 950 | 10 | |||
| Scorpion PP-20BH | BH | 17.3-19.8 | 380 | 17.5 | ||
| Scorpion PP-20SBH | SBH | 18.3-20.8 | 210 | 21.5 | ||
| Scorpion 89 | Scorpion PP-25DP | DP | 25.3-27.8 |
20/ 180-135-112.5 |
1000 | 11 |
| Scorpion PP-25SDP | SDP | 1200 | 10 | |||
| Scorpion PP-25BH | BH | 600 | 20 | |||
| Scorpion PP-25SBH | SBH | 24.3-26.8 | 250 | 23 | ||
| Scorpion PP-25GH | GH | 25.3-27.8 | 600 | 16 | ||
| Scorpion 102 | Scorpion PP-32DP | DP | 25.3-31.8 | 20/ 180-135-112.5 |
1100 | 11 |
| Scorpion PP-32SDP | SDP | 29.3-31.8 | 1300 | 10 | ||
| Scorpion PP-32GH | GH | 31.3-33.8 | 700 | 17 | ||
| Scorpion PP-32SBH | SBH | 24.3-26.8 | 210 | 25 | ||
| Scorpion PP-36SDP | SDP | 37.3-41.3 | 16/ 180-135-112.5 |
1600 | 12 | |
| Scorpion PP-36GH | GH | 35.3-37.8 | 1000 | 15 | ||
| Scorpion 114 | Scorpion PP-32DP | DP | 25.3-31.8 | 20/ 180-135-112.5 |
1100 | 11 |
| Scorpion PP-32SDP | SDP | 29.3-31.8 | 1300 | 10 | ||
| Scorpion PP-32SBH | SBH | 24.3-26.8 | 210 | 25 | ||
| Scorpion PP-36SDP | SDP | 37.3-41.3 | 16/ 180-135-112.5 |
1600 | 12 | |
| Scorpion PP-36GH | GH | 35.3-37.8 | 1000 | 15 | ||
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1) Depending on the explosive material used in the charge. |
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Phasing and layout
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