Perforating system for hydraulic fracturing operations
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
E21B-043/117
E21B-043/119
F42B-003/08
F42B-003/02
F42B-001/028
출원번호
US-0306403
(2014-06-17)
등록번호
US-10184326
(2019-01-22)
발명자
/ 주소
Flores, Juan Carlos
출원인 / 주소
Baker Hughes, a GE Company LLC
대리인 / 주소
Bracewell LLP
인용정보
피인용 횟수 :
0인용 특허 :
22
초록▼
A perforating system for creating perforations that azimuthally circumscribe an inner wall of a wellbore, and that are at substantially the same depth in the wellbore. The perforating system includes perforating assemblies that are housed in a gun body and spaced axially apart. The perforating assem
A perforating system for creating perforations that azimuthally circumscribe an inner wall of a wellbore, and that are at substantially the same depth in the wellbore. The perforating system includes perforating assemblies that are housed in a gun body and spaced axially apart. The perforating assemblies have shaped charges positioned at selective angles around an axis of the gun body and at substantially the same axial location in the gun body. Bulkheads are provided between adjacent shaped charges, so that initiating the shaped charges forms angularly spaced apart perforations in a tubular in which the perforating system is inserted. Pressurizing the wellbore with fracturing fluid extends the perforations into fractures, where the fractures are normal to an axis of the wellbore and in a plane of minimum stress.
대표청구항▼
1. A perforating system for use in fracturing a subterranean formation adjacent a wellbore comprising: a gun body; anda perforating assembly in the gun body that comprises, an axis that extends in a direction along an elongate side of the gun body,perforating assemblies axially disposed in the gun b
1. A perforating system for use in fracturing a subterranean formation adjacent a wellbore comprising: a gun body; anda perforating assembly in the gun body that comprises, an axis that extends in a direction along an elongate side of the gun body,perforating assemblies axially disposed in the gun body and each having an outer periphery in direct contact with an outer periphery of an adjacent perforating assembly,a plurality of shaped charge assemblies disposed in each perforating assembly and arranged circumferentially about the same location of the axis that each have an amount of explosive with a rearward side facing the axis of the perforating assembly, a forward side facing away from the axis of the perforating assembly, lateral sides that extend between the rearward and forward sides and that are substantially planar, and a liner mounted on the forward side of the explosive,bulkheads between each of the adjacent shaped charge assemblies that define barriers, so that when the amount of explosive in each shaped charge assembly is detonated, each amount of explosive that is detonated collapses the liner to form a jet that in turn creates a perforation extending into the formation, and that is angularly spaced away from adjacent perforations that also extends into the formation, where oil/gas from the formation flows to the wellbore through the perforations, anda filler material disposed in voids that are defined between each adjacent perforating assembly. 2. The perforating system of claim 1, further comprising a case having a cavity on an outer periphery of the case, and wherein the shaped charge assemblies are disposed in the cavity. 3. The perforating system of claim 2, further comprising passages that extend radially through the case and provide communication between the amounts of explosive and a detonating cord that axially intersects the case. 4. The perforating system of claim 1, wherein the explosive comprises a mixture having components selected from the group consisting of cyclotetramethylene-tetranitramine, hexanitrostilbene, cyclotrimethylenetrinitramine, 2,6-pyridinediamine, 1,1,3 trinitroazetidine, and combinations thereof. 5. The perforating system of claim 1, wherein the shaped charge assemblies each have a V-shaped cross section with an apex that is directed towards the axis of the perforating assembly, and wherein the V-shaped cross section fully extends between the lateral sides. 6. The perforating system of claim 1, wherein each perforating assembly comprises a case that provides a structure for mounting shaped charge assemblies and bulkheads of each perforating assembly, wherein the case includes a generally planer mid portion that extends radially outward a distance from the axis, and wherein radially formed passages are provided in the mid portion. that each contain an amount of a booster charge. 7. The perforating system of claim 1, further comprising a plurality of gun bodies connected end to end and coupled with the first perforating gun to define a downhole string. 8. A method of fracturing a subterranean formation comprising: providing a downhole string that comprises,a gun body, anda plurality of perforating assemblies axially disposed in the gun body and each having an outer periphery in direct contact with an outer periphery of an adjacent perforating assembly, each of said perforating assemblies having, a group of shaped charges at the same axial location in the gun body and that are directed radially outward from an axis of the gun body, the shaped charges each having an explosive, a liner, and planar lateral sides, andbulkheads between adjacent shaped charges;inserting the downhole string in a wellbore that intersects the formation;detonating the shaped charges so that the liners in each shaped charge are ejected into a jet-like fashion to form a series of perforations into the formation through which oil/gas in the formation is flowable into the wellbore, and so that perforations extend radially outward from the downhole string at the same axial location in the wellbore, and into the formation a distance that is within a plane of minimum stress; andpressurizing the wellbore to create fractures in the formation that propagate from the perforations and extend further radially outward into the plane of minimum stress. 9. The method of claim 8, further comprising removing the downhole string from the wellbore, inserting a line into the wellbore, and pressurizing the wellbore by directing pressurized fluid into the line that discharges from the line into the wellbore. 10. The method of claim 8, wherein the fractures are in the minimum plane of stress. 11. A perforating system for use in fracturing a subterranean formation adjacent a wellbore comprising: a gun body; anda plurality of perforating assemblies axially disposed in the gun body and each having an outer periphery in direct contact with an outer periphery of an adjacent perforating assembly, each of said perforating assemblies comprises, an axis that is oriented substantially parallel with sidewalls of the wellbore when the perforating system is disposed in the wellbore,a midsection,shaped charge assemblies that each have an amount of explosive with a rearward side facing an axis of the perforating assembly, a forward side facing away from the axis of the perforating assembly and that angles radially outward from the axis with distance from the midsection, a liner adjacent the explosive on the forward side, and lateral sides that extend between the rearward and forward sides and that are substantially planar, andbulkheads between each of the adjacent shaped charge assemblies that define barriers, and each having a width that increases with distance from the axis to the outer radial circumference of the bulkhead, so that when the amount of explosive in each shaped charge assembly is detonated, each amount of explosive that is detonated ejects the liner from the shaped charge assemblies to form a jet that forms a perforation in a plane of minimum stress in the formation that is angularly spaced away from an adjacent perforation in the formation, so that when pressurized fluid is applied to the perforations, fractures are created in the formation that are normal to an axial axis of the wellbore and do not extend oblique to the axis.
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