This invention provides a multi-frac composite perforation device having (i) a gun body having an outer wall, (ii) an inner gunpowder box between adjacent perforating charges in the charge frame 1 of said perforation device, and (iii) a structure for gunpowder charge with an outer gunpowder box 4 at
This invention provides a multi-frac composite perforation device having (i) a gun body having an outer wall, (ii) an inner gunpowder box between adjacent perforating charges in the charge frame 1 of said perforation device, and (iii) a structure for gunpowder charge with an outer gunpowder box 4 attached to an outer wall of the charge frame 1, the gun body has a pressure releasing structure corresponding to a closed end of the perforating charge. This invention further provides a method of using the multi-frac composite perforating device to fracture a formation and the choice of gunpowders and gun body thickness with regards to the pressure required for fracturing a formation.
대표청구항▼
1. A multi-frac composite perforation device comprising (i) a gun body having an outer wall, (ii) an inner gunpowder box between adjacent perforating charges in the charge frame 1 of said perforation device, and (iii) a structure for gunpowder charge comprising an outer gunpowder box 4 attached to a
1. A multi-frac composite perforation device comprising (i) a gun body having an outer wall, (ii) an inner gunpowder box between adjacent perforating charges in the charge frame 1 of said perforation device, and (iii) a structure for gunpowder charge comprising an outer gunpowder box 4 attached to an outer wall of the charge frame 1, wherein said outer gunpowder box 4 comprises a middle gunpowder box 3 and two side-hung gunpowder boxes 2A and 2B, wherein said boxes 2A and 2B are separately located on the two sides of said middle gunpowder box 3, and wherein the gunpowders charged in said inner gunpowder box and outer gunpowder box 4 are classified into three types: high burning rate gunpowder having combustion endpoint of 25˜80 ms, middle burning rate gunpowder having combustion endpoint of 80˜280 ms and low burning rate gunpowder having combustion endpoint of 300˜800 ms; wherein said gun body comprises a pressure releasing structure corresponding to a closed end of the perforating charge. 2. The multi-frac composite perforation device of claim 1, wherein said pressure releasing structure is a stepped through hole and a sealing cap is mounted on the step of said stepped through hole. 3. The multi-frac composite perforation device of claim 1, wherein said pressure releasing structure is a recess having a sealing cap mounted in said recess. 4. The multi-frac composite perforation device of claim 1, wherein the thickness of said outer wall of the gun body is varied according to the pressure required to fracture a formation. 5. The multi-frac composite perforation device of claim 1, wherein the thickness of said outer wall of the gun body is 10-12 mm when ≧80 MPa is required for fracturing a formation. 6. The multi-frac composite perforation device of claim 1, wherein the thickness of said outer wall of the gun body is 8-10 mm when ≦80 MPa is required for fracturing a formation. 7. The multi-frac composite perforation device of claim 1, wherein the time difference between the pressure peaks of the middle burning rate gunpowder and the high burning rate gunpowder is about 5˜10 ms, and the time difference between the pressure peaks of the low burning rate gunpowder and the middle burning rate gunpowder is about 20˜50 ms. 8. The multi-frac composite perforation device of claim 1, wherein the middle gunpowder box 3 and the two side-hung gunpowder boxes 2A and 2B are connected by a hinging mechanism, strapping with flexible belt or bonding with adhesive. 9. The multi-frac composite perforation device of claim 1, wherein said middle gunpowder box 3 is located at a position corresponding to the jet emitting end of a perforating charge. 10. The multi-frac composite perforation device of claim 1, wherein said middle gunpowder box 3 has an inner side comprising an inner groove 32 for orienting the perforating charge and a through hole 33 through which the jet flow passes. 11. The multi-frac composite perforation device of claim 1, wherein the outer gunpowder box 4 is attached to said outer wall of the charge frame 1 by means of: clamping, wherein the inner side of the side-hung gunpowder boxes 2A and 2B has claws 22 and 23 for fitting into the installation holes of said charge frame 1 or inserting into the grooves of said charge frame 1; or,spring jig, wherein gunpowder box 4 is attached to said outer wall of the charge frame 1 by a matching structure of a lock hook 24 and a lock catch 25. 12. A perforation device comprising a perforating portion and a fracturing portion which are connected by an adaptor, wherein said fracturing portion comprises at least one column of gunpowder for fracturing, and said perforating portion comprises (i) a gun body having an outer wall, (ii) an inner gunpowder box between adjacent perforating charges in the charge frame 1 of said perforation device, and (iii) a structure for gunpowder charge comprising an outer gunpowder box 4 attached to an outer wall of the charge frame 1, wherein said outer gunpowder box 4 comprises a middle gunpowder box 3 and two side-hung gunpowder boxes 2A and 2B, wherein said boxes 2A and 2B are separately located on the two sides of said middle gunpowder box 3, and wherein the gunpowders charged in said inner gunpowder box and outer gunpowder box 4 are classified into three types: high burning rate gunpowder having combustion endpoint of 25˜80 ms, middle burning rate gunpowder having combustion endpoint of 80˜280 ms and low burning rate gunpowder having combustion endpoint of 300˜800 ms; wherein said gun body comprises a pressure releasing structure corresponding to a closed end of the perforating charge. 13. A method of using multi-frac composite perforating device to fracture a formation, wherein said multi-frac composite perforating device comprises (i) a gun body having an outer wall, (ii) an inner gunpowder box between adjacent perforating charges in the charge frame 1 of said perforation device, and (iii) a structure for gunpowder charge comprising an outer gunpowder box 4 attached to an outer wall of the charge frame 1, wherein said outer gunpowder box 4 comprises a middle gunpowder box 3 and two side-hung gunpowder boxes 2A and 2B, wherein said boxes 2A and 2B are separately located on the two sides of said middle gunpowder box 3, and wherein the gunpowders charged in said inner gunpowder box and outer gunpowder box 4 are classified into three types: high burning rate gunpowder having combustion endpoint of 25˜80 ms, middle burning rate gunpowder having combustion endpoint of 80˜280 ms and low burning rate gunpowder having combustion endpoint of 300˜800 ms; wherein said gun body comprises a pressure releasing structure corresponding to a closed end of the perforating charge; said method comprising the steps of:charging said middle gunpowder box and said two side-hung gunpowder boxes with one or more types of gunpowders selected from the group consisting of high burning rate gunpowder having combustion endpoint of 25˜80 ms, middle burning rate gunpowder having combustion endpoint of 80˜280 ms, and low burning rate gunpowder having combustion endpoint of 300˜800 ms; andplacing said device in the formation to fracture said formation. 14. The method of claim 13, wherein the gunpowders charged in said middle and side-hung gunpowder boxes are of the same or different types. 15. The method of claim 13, wherein for formations requiring ≧80 MPa to fracture or brittle formations, the combination of gunpowders used is 50% to 100% high burning rate gunpowder, 0% to 25% middle burning rate gunpowder and 0% to 25% low burning rate gunpowder. 16. The method of claim 13, wherein for formations requiring ≧80 MPa to fracture or contaminated formations, the combination of gunpowders used is 0% to 25% high burning rate gunpowder, 0% to 25% middle burning rate gunpowder and 50% to 100% low burning rate gunpowder. 17. The method of claim 13, wherein the thickness of the outer wall of said gun body is varied according to the pressure required to fracture a formation. 18. The method of claim 17, wherein the thickness of said outer wall is 10-12 mm when ≧80 MPa is required for fracturing a formation. 19. The method of claim 17, wherein the thickness of said outer wall is 8-10 mm when ≧80 MPa is required for fracturing a formation.
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