OIL AND GAS WELL HYDRO-SLOTTING PERFORATION PROFESSIONAL SERVICE

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COMPARISON CHARACTERISTICS OF METHODS OF INITIAL OPENING THE PRODUCTIVE FORMATION WITH CONFORMITY THE MAIN REQUIREMENTS OF GEOMECHANICS

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INITIAL OPENING WITH GUN OR CUMULATIVE PERFORATION

Gun or cumulative perforation occurs the impact, deformation of casing, destruction and formation of cracks in cement that become longer and deeper especially after subsequent fracturing. Also gun or cumulative perforation creates a stable melted border. Unloading the stress conditions in the near wellbore zone is not happening.

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INITIAL OPENING WITH ABRASIVE JETS POINT PERFORATION

Abrasive jet (point) perforation not deforms the casing, does not destroys the cement (keeps the integrity of the cement sheath), and does not forms the borders in the opening productive formation zone, but the penetration depth not exceeding 1 ft. (0.3 m). Unloading the stress conditions in the near wellbore zone is not happening.

INITIAL OPENING WITH HYDRO-MECHANICAL PERFORATION

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Hydro-mechanical (non-abrasive) slotting perforation (HMSP) does not deforms the casing, does not destroys the cement (keeps the integrity of the cement sheath), and does not forms the borders in the opening productive formation zone. Penetration up to 2.5 ft. (0.7 m) and drainage opening area up to 18 ft.² per linear foot, or 5 м² per one linear meter (with simultaneous formation of four slots). Occurs unloading of the stress conditions in the near wellbore zone.

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INITIAL OPENING WITH HYDRO-SLOTTING (ABRASIVE) PERFORATION

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Hydro-slotting (abrasive) perforation (HSP) does not deforms the casing, does not destroys the cement (keeps the integrity of the cement sheath), and does not forms the borders in the opening productive formation zone. Penetration up to 5 ft. (1.5 m) and drainage opening area up to 40 ft.² per linear foot, or 12 м² per one linear meter (with simultaneous formation of four slots). Occurs unloading of the stress conditions in the near wellbore zone. HMSP and HSP are environmentally friendly and only the methods of the initial opening the casing, cement and productive formations with unloading stress conditions in the near wellbore zone.

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HYDRAULIC FRACTURING

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Hydraulic fracturing is the most powerful method of opening a productive formation. Application is possible only after prior opening of the casing (initial opening). It forms deep cracks and micro cracks, the direction of which defies prediction, integrates productive and unproductive formations, "pulls" the nearest water. Good results after HMSP and HSP, which sets the follow geometry for hydraulic fracturing.

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Comparative characteristics of the main initial opening methods clearly shows, that the most effective and meets all the required parameters of Geomechanics are HMSP (hydro-mechanical slotting perforation) and HSP (hydro-slotting perforation). The second, even more efficient because it uses abrasive sand. Wells which initially developed with using such effective opening methods (HMSP and HSP) continue to "work" 10 -15 and more years.

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