US20120241169A1 - Well tool assemblies with quick connectors and shock mitigating capabilities - Google Patents
Well tool assemblies with quick connectors and shock mitigating capabilities Download PDFInfo
- Publication number
- US20120241169A1 US20120241169A1 US13/413,588 US201213413588A US2012241169A1 US 20120241169 A1 US20120241169 A1 US 20120241169A1 US 201213413588 A US201213413588 A US 201213413588A US 2012241169 A1 US2012241169 A1 US 2012241169A1
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- Prior art keywords
- perforating
- connectors
- assembly
- shock
- connection
- Prior art date
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- Abandoned
Links
- 230000035939 shock Effects 0.000 title claims abstract description 73
- 230000000116 mitigating effect Effects 0.000 title claims abstract description 9
- 230000000712 assembly Effects 0.000 title description 6
- 238000000429 assembly Methods 0.000 title description 6
- 239000006096 absorbing agent Substances 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 25
- 238000005474 detonation Methods 0.000 claims abstract description 20
- 238000010304 firing Methods 0.000 claims description 28
- 238000006073 displacement reaction Methods 0.000 claims description 11
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000008901 benefit Effects 0.000 description 13
- 239000000463 material Substances 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 229910001369 Brass Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000002800 charge carrier Substances 0.000 description 1
- 238000012217 deletion Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000011359 shock absorbing material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/07—Telescoping joints for varying drill string lengths; Shock absorbers
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
- E21B43/116—Gun or shaped-charge perforators
Definitions
- the present disclosure relates generally to equipment utilized and operations performed in conjunction with subterranean wells and, in an embodiment described herein, more particularly provides a well tool assembly with quick connectors and shock mitigating capabilities.
- shock absorbers have been used in the past in attempts to prevent damage to well equipment resulting from firing perforating guns and other events.
- a shock absorber is interconnected between a perforating assembly and the well equipment (such as, a packer, gravel packing equipment, instruments, etc.) to be protected from shock loads.
- shock loads are transmitted in a very short amount of time (e.g., ⁇ 10-30 milliseconds), and conventional shock absorbers are either too rigid to react adequately to the shock, or too compliant to absorb the shock. Therefore, it will be appreciated that improvements are needed in the art of mitigating shock for well assemblies.
- Improvements are also needed in the art of connecting well tool assemblies. Such improvements could reduce the amount of time needed to connect perforating devices or other well tools, and could prevent damage to connectors used to connect well tools.
- shock absorbers are interconnected in a perforating assembly.
- connections are made between well tools without threading.
- a method described below can include interconnecting a well tool in a well tool assembly with a shock mitigating connection, the interconnecting being performed without threading, and positioning the well tool assembly in a wellbore.
- the method may be used for well perforating assemblies, or for other types of well tool assemblies.
- a well perforating assembly in one aspect, can include at least two perforating devices, a detonation train extending through the perforating devices, and a shock absorber positioned between the perforating devices.
- a method of assembling a perforating assembly is described below.
- the method can include, prior to installing the perforating assembly in a wellbore, pushing one perforating device connector into another perforating device connector without threading the connectors together, thereby: a) preventing disconnection of the connectors and b) making a connection in a detonation train.
- a well system which can include a perforating assembly including multiple perforating guns and multiple shock absorbers. Each shock absorber is interconnected between at least two of the perforating guns.
- FIG. 1 is a representative partially cross-sectional view of a well system and associated method which can embody principles of the present disclosure.
- FIG. 2 is an enlarged scale representative partially cross-sectional view of a prior art perforating assembly.
- FIG. 3 is a representative cross-sectional view of a perforating assembly which can embody principles of this disclosure.
- FIG. 4 is a further enlarged scale cross-sectional view of detail 4 in FIG. 3 .
- FIG. 5 is a still further enlarged scale cross-sectional view of detail 5 in FIG. 4 .
- FIG. 6 is a representative partially cross-sectional view of another configuration of the well system and method.
- FIG. 1 Representatively illustrated in FIG. 1 is a well system 10 and associated method which can embody principles of the present disclosure.
- a perforating assembly 12 is positioned in a wellbore 14 for forming perforations 16 through casing 18 lining the wellbore.
- the perforating assembly 12 can include any number of perforating devices, such as a firing head 20 and perforating guns 22 .
- the firing head 20 fires the perforating guns 22 in response to a particular stimulus (e.g., pressure levels, pressure pulses, a telemetry signal, a bar dropped through a tubular string to the firing head, etc.).
- a particular stimulus e.g., pressure levels, pressure pulses, a telemetry signal, a bar dropped through a tubular string to the firing head, etc.
- Any type of firing head, and any type of perforating guns may be used in the perforating assembly 12 in keeping with the principles of this disclosure.
- firing head 20 connected above the perforating guns 22 is depicted in FIG. 1 , it will be appreciated that any number or position of firing head(s) may be used, as desired.
- the firing head 20 could be connected at a lower end of the perforating assembly 12 , multiple firing heads could be used, a separate firing head could be used for each perforating gun, etc.
- the packer 24 is used herein as one example of a type of well equipment which can be protected using the principles of this disclosure, but it should be clearly understood that any other types of well equipment (e.g., anchors, hangers, instruments, other perforating devices, etc.) may be protected in other examples.
- well equipment e.g., anchors, hangers, instruments, other perforating devices, etc.
- a shock absorbing connection 26 is disposed between each adjacent pair of the perforating guns 22 , and a shock absorbing connection is also disposed between the firing head 20 and the uppermost perforating gun.
- the connections 26 also allow the perforating devices (firing head 20 and perforating guns 22 ) to be quickly assembled to each other prior to installing the perforating assembly 12 in the wellbore 14 .
- connection 26 is depicted in FIG. 1 between each adjacent pair of the perforating guns 22 , it will be appreciated that the connections could be otherwise positioned. In other examples, some adjacent pairs of perforating guns 22 may not have the connections 26 between them. Thus, it is not necessary for each adjacent pair of perforating guns 22 to have one of the connections 26 between them, nor is it necessary for one of the connections 26 to be positioned between the firing head 20 and the adjacent perforating gun 22 .
- each connection only has to absorb shock generated due to firing of the adjacent perforating device(s), and accumulation of the shock loads along the perforating assembly is prevented, or at least beneficially mitigated. Greater or fewer numbers of the connections 26 may be used in the perforating assembly 12 as needed to achieve a desired level of shock mitigation.
- the perforating assembly 28 includes the perforating guns 22 , with each perforating gun including perforating charges 30 , a charge carrier 32 and detonating cord 34 in a generally tubular gun body 36 .
- the perforating assembly 28 of FIG. 2 includes a rigid, threaded connection 38 between the perforating guns 22 .
- a connector 40 having opposing externally-threaded ends is threaded into one perforating gun 22
- another connector 42 having opposing externally- and internally-threaded ends is threaded into another perforating gun 22 .
- connection 38 has no shock absorbing capability, and threading the connectors 40 , 42 to each other can be difficult when the guns 22 are long and/or heavy, sometimes resulting in damage to threads on the connectors.
- connection 26 used in the system 10 is representatively illustrated in FIG. 3 .
- the connection 26 may be used between perforating guns 22 , between a perforating gun and the firing head 20 , or between any other well tools or equipment.
- the connection 26 may also be used in perforating assemblies other than the perforating assembly 12 , and in well systems other than the well system 10 , in keeping with the principles of this disclosure.
- the connection 26 includes a connector 44 which is attached to a perforating device (such as a perforating gun or firing head, not shown), and another connector 46 which is depicted in FIG. 3 as being attached to a perforating gun 22 .
- the connectors 44 , 46 may each be attached to the respective perforating guns 22 , firing head 20 or other perforating devices or other well tools by threading or any other suitable means.
- connection 26 the connector 44 can be inserted and pushed into the other connector 46 without threading. Once connected in this manner, an engagement device 48 prevents disconnection of the connectors 44 , 46 .
- the engagement device 48 permits the connector 44 to displace in one direction longitudinally toward the other connector 46 , but prevents the connector 44 from displacing in the opposite longitudinal direction relative to the connector 46 .
- the connection 26 can be longitudinally compressed, but the device 48 prevents the connection from being elongated longitudinally.
- detonation transfer components such as, detonation boosters 56 attached at ends of the detonating cords 34
- detonation transfer components are brought into close proximity to each other when the connector 44 is pushed into the other connector 46 . In this manner, a connection is made in a detonation train 54 (including the detonating cord 34 , boosters 56 , etc.) which extends through the connection 26 .
- connection 26 includes shock absorbers 50 , 52 disposed between the connectors 44 , 46 .
- the shock absorbers 50 , 52 function to absorb shock loads which would otherwise be transmitted through the connection 26 .
- the shock absorbers 50 , 52 are preferably made of a material which can deform appropriately to absorb the shock loads resulting from firing of the perforating devices.
- Some acceptable materials for the shock absorbers 50 , 52 can include brass, aluminum, rubber, foamed materials, or any other shock absorbing materials.
- the shock absorbers 50 , 52 may be annular-shaped as depicted in FIG. 3 , or they could have any other shapes, such as round, square, T- or I-shaped cross-sections, etc.
- the size, shape, material and/or other characteristics of the shock absorbers 50 , 52 may be customized for their placement in the perforating assembly 12 , position in the well, size and length of the adjacent perforating devices or other well tools, etc.
- shock absorbers 50 , 52 are illustrated in the connection 26 example of FIG. 3 , in other examples different numbers of shock absorbers (including one) may be used.
- detonation train 54 is depicted as extending through the shock absorbers 50 , 52 , such an arrangement is not necessary in keeping with the principles of this disclosure.
- connection 26 allows for longitudinal compression of the connectors 44 , 46 , when a compressive shock load is transmitted to the connection, the connectors will compress somewhat, with the shock absorbers 50 , 52 thereby absorbing the compressive shock load. In this manner, transmission of the shock load across the connection 26 is prevented, or is at least significantly mitigated.
- the engagement device 48 comprises a segmented or longitudinally split sleeve 58 having a series of relatively coarse pitch ramp-type profiles 60 on an exterior thereof, and a series of relatively fine pitch profiles 62 on an interior thereof.
- the profiles 60 , 62 may be formed as threads on the engagement device 48 , with the respective connectors 46 , 44 having complementarily shaped profiles formed thereon.
- the profiles 60 could be formed as 45-degree buttress threads, and the profiles 62 could be formed as a “phonograph” finish (very fine grooves).
- the connectors 44 , 46 are not threaded to each other with the engagement device 48 . Instead, the connector 44 is preferably pushed into the connector 46 (without rotating or threading either connector), and the engagement device 48 prevents the connector 44 from being withdrawn from the connector 46 .
- this result is accomplished due to the ramped interface between the profiles 60 and the connector 46 , and gripping of the connector 44 by the profiles 62 .
- a further enlarged scale view of this engagement between the connectors 44 , 46 and the device 48 is representatively illustrated in FIG. 5 .
- the profiles 62 will grip the outer surface of the connector 44 , so that the sleeve 58 attempts to displace with the connector 44 .
- the ramps of the profiles 60 in engagement with the connector 46 , prevent downward (as viewed in FIG. 5 ) displacement of the connector 44 and sleeve 58 , and cause the sleeve to be compressed radially inward.
- the inward compression of the sleeve 58 causes the profiles 62 to more securely grip the outer surface of the connector 44 .
- the sleeve 58 can be formed with a C-shaped lateral cross-section, so that it can be readily deformed inward.
- the sleeve 58 can also be deformed radially outward, if desired, so that it no longer grips the outer surface of the connector 44 , thereby allowing the connector 44 to be withdrawn from the connector 46 , for example, to disassemble the perforating assembly 12 after firing, after a misfire, etc.
- connection 26 is described above as having multiple benefits (e.g., speed of connecting, lack of threading connectors 44 , 46 to each other, shock absorbing capability, detonation train 54 connecting, etc.), it is not necessary for all of the above-described benefits to be incorporated into a single connection embodying principles of this disclosure.
- the connection 26 could include one of the above-described benefits, any subset of those benefits, and/or other benefits.
- connections 26 are used to prevent or mitigate shock being transmitted to various well tools 64 a - c interconnected in a well tool assembly 66 positioned in the wellbore 14 .
- the well tool 64 a comprises an instrument carrier (containing, for example, one or more pressure and/or temperature sensors, etc.), the well tool 64 b comprises a fluid sampler (e.g., with chambers therein for containing selectively filled fluid samples), and the well tool 64 c comprises an electronics module (e.g., used for receiving, storing and/or transmitting data, commands, etc., measuring parameters, etc.).
- an electronics module e.g., used for receiving, storing and/or transmitting data, commands, etc., measuring parameters, etc.
- the assembly 66 it is not necessary for the assembly 66 to include multiple well tools. Instead, a single well tool may benefit from use of the connections 26 .
- connections 26 may be used on both ends of each of the well tools 64 a - c as depicted in FIG. 6 . Instead, a connection 26 may be used on only one end of a well tool, or in positions other than the ends of a well tool.
- connections 26 prevent or mitigate shock being transmitted to the well tools 64 a - c interconnected in the assembly 66 , and also allow the well tools to be interconnected in the assembly quickly and without threading.
- the firing head 20 , perforating guns 22 and packer 24 described above are also examples of well tools which can benefit from use of the connection 26 .
- connection 26 depicted in FIGS. 1 & 3 - 6 allows for shock loads to be absorbed or at least mitigated between perforating devices or other well tools, and allows perforating devices and other well tools to be connected to each other quickly and without threading.
- a method described above can include interconnecting a well tool 64 a - c in a well tool assembly 66 with a shock mitigating connection 26 , the interconnecting being performed without threading, and positioning the well tool assembly 66 in a wellbore 14 .
- the connection 26 may comprise at least one shock absorber 50 , 52 positioned between connectors 44 , 46 .
- the connection 26 may comprise a sleeve 58 having relatively coarse pitch profiles 60 on one side, and the sleeve 58 having relatively fine pitch profiles 62 on an opposite side.
- Interconnecting can include pushing one connector 44 into another connector 46 without threading the connectors 44 , 46 together, thereby preventing disconnection of the connectors 44 , 46 .
- An engagement device 48 may permit relative displacement between the connectors 44 , 46 in one longitudinal direction, but prevent relative displacement between the connectors 44 , 46 in an opposite longitudinal direction.
- the well tool may be one or more of a perforating gun 22 , a firing head 20 , a packer 24 , an instrument carrier 64 a, a fluid sampler 64 b and an electronics module 64 c.
- a well perforating assembly 12 described above can include at least two perforating devices (such as firing head 20 , perforating gun 22 , etc.), a detonation train 54 extending through the perforating devices 20 , 22 , and a shock absorber 50 , 52 positioned between the perforating devices 20 , 22 .
- perforating devices such as firing head 20 , perforating gun 22 , etc.
- detonation train 54 extending through the perforating devices 20 , 22
- a shock absorber 50 , 52 positioned between the perforating devices 20 , 22 .
- the shock absorber 50 , 52 preferably absorbs longitudinally directed shock generated by firing at least one of the perforating devices 20 , 22 .
- the detonation train 54 may extend longitudinally through the shock absorber 50 , 52 .
- the perforating devices may comprise perforating guns 22 .
- the perforating devices may comprise a perforating gun 22 and a firing head 20 .
- the assembly 12 can include a connection 26 between the perforating devices 20 , 22 .
- An engagement device 48 of the connection 26 may permit longitudinal compression of the connection 26 , but prevent elongation of the connection 26 .
- connection 26 can comprise connectors 44 , 46 attached to the respective perforating devices.
- the engagement device 48 may permit relative displacement between the connectors 44 , 46 in one longitudinal direction, but prevent relative displacement between the connectors 44 , 46 in an opposite longitudinal direction.
- the connectors 44 , 46 are preferably connected to each other without threading together the connectors 44 , 46 .
- the detonation train 54 may extend through the connectors 44 , 46 .
- the method can include, prior to installing the perforating assembly 12 in a wellbore 14 , pushing one perforating device connector 44 into another perforating device connector 46 without threading the connectors 44 , 46 together, thereby: a) preventing disconnection of the connectors 44 , 46 and b) making a connection in a detonation train 54 .
- the method can also include positioning a shock absorber 50 , 52 between the connectors 44 , 46 .
- the shock absorber 50 , 52 may absorb longitudinally directed shock generated by firing at least one perforating device 20 , 22 .
- the detonation train 54 may extend longitudinally through the shock absorber 50 , 52 .
- Each, or at least one, of the perforating device connectors 44 , 46 may be attached to a perforating gun 22 . At least one of the perforating device connectors 44 , 46 may be attached to a firing head 20 .
- the above disclosure also provides to the art a well system 10 .
- the well system 10 can comprise a perforating assembly 12 including multiple perforating guns 22 and multiple shock absorbers 50 , 52 .
- Each shock absorber 50 , 52 may be interconnected between at least two of the perforating guns 22 .
- Each shock absorber 50 , 52 preferably mitigates transmission of shock from one connector 44 to another 46 , the connectors being longitudinally compressible but prevented from elongating.
- a detonation train 54 may extend through the shock absorbers 50 , 52 .
Abstract
A method can include interconnecting a well tool in a well tool assembly with a shock mitigating connection, the interconnecting being performed without threading, and positioning the well tool assembly in a wellbore. A well perforating assembly can include at least two perforating devices, a detonation train extending through the perforating devices, and a shock absorber positioned between the perforating devices. A method of assembling a perforating assembly can include, prior to installing the perforating assembly in a wellbore, pushing one perforating device connector into another perforating device connector without threading the connectors together, thereby: a) preventing disconnection of the connectors and b) making a connection in a detonation train. A well system can include a perforating assembly including multiple perforating guns and multiple shock absorbers. Each shock absorber may be interconnected between at least two of the perforating guns.
Description
- This application claims the benefit under 35 USC §119 of the filing date of International Application Serial No. PCT/US11/29412 filed 22 Mar. 2011. The entire disclosure of this prior application is incorporated herein by this reference.
- The present disclosure relates generally to equipment utilized and operations performed in conjunction with subterranean wells and, in an embodiment described herein, more particularly provides a well tool assembly with quick connectors and shock mitigating capabilities.
- Shock absorbers have been used in the past in attempts to prevent damage to well equipment resulting from firing perforating guns and other events. In some situations, a shock absorber is interconnected between a perforating assembly and the well equipment (such as, a packer, gravel packing equipment, instruments, etc.) to be protected from shock loads.
- However, testing has revealed that such shock loads are transmitted in a very short amount of time (e.g., ˜10-30 milliseconds), and conventional shock absorbers are either too rigid to react adequately to the shock, or too compliant to absorb the shock. Therefore, it will be appreciated that improvements are needed in the art of mitigating shock for well assemblies.
- Improvements are also needed in the art of connecting well tool assemblies. Such improvements could reduce the amount of time needed to connect perforating devices or other well tools, and could prevent damage to connectors used to connect well tools.
- In carrying out the principles of the present disclosure, systems and methods are provided which bring improvements to the art. One example is described below in which multiple shock absorbers are interconnected in a perforating assembly. Another example is described below in which connections are made between well tools without threading.
- A method described below can include interconnecting a well tool in a well tool assembly with a shock mitigating connection, the interconnecting being performed without threading, and positioning the well tool assembly in a wellbore. The method may be used for well perforating assemblies, or for other types of well tool assemblies.
- In one aspect, a well perforating assembly is disclosed. The perforating assembly can include at least two perforating devices, a detonation train extending through the perforating devices, and a shock absorber positioned between the perforating devices.
- In another aspect, a method of assembling a perforating assembly is described below. The method can include, prior to installing the perforating assembly in a wellbore, pushing one perforating device connector into another perforating device connector without threading the connectors together, thereby: a) preventing disconnection of the connectors and b) making a connection in a detonation train.
- In yet another aspect, a well system is provided which can include a perforating assembly including multiple perforating guns and multiple shock absorbers. Each shock absorber is interconnected between at least two of the perforating guns.
- These and other features, advantages and benefits will become apparent to one of ordinary skill in the art upon careful consideration of the detailed description of representative embodiments of the disclosure hereinbelow and the accompanying drawings, in which similar elements are indicated in the various figures using the same reference numbers.
-
FIG. 1 is a representative partially cross-sectional view of a well system and associated method which can embody principles of the present disclosure. -
FIG. 2 is an enlarged scale representative partially cross-sectional view of a prior art perforating assembly. -
FIG. 3 is a representative cross-sectional view of a perforating assembly which can embody principles of this disclosure. -
FIG. 4 is a further enlarged scale cross-sectional view of detail 4 inFIG. 3 . -
FIG. 5 is a still further enlarged scale cross-sectional view ofdetail 5 inFIG. 4 . -
FIG. 6 is a representative partially cross-sectional view of another configuration of the well system and method. - Representatively illustrated in
FIG. 1 is awell system 10 and associated method which can embody principles of the present disclosure. In thesystem 10, a perforatingassembly 12 is positioned in awellbore 14 for formingperforations 16 throughcasing 18 lining the wellbore. - The perforating
assembly 12 can include any number of perforating devices, such as afiring head 20 and perforatingguns 22. Thefiring head 20 fires the perforatingguns 22 in response to a particular stimulus (e.g., pressure levels, pressure pulses, a telemetry signal, a bar dropped through a tubular string to the firing head, etc.). Any type of firing head, and any type of perforating guns, may be used in theperforating assembly 12 in keeping with the principles of this disclosure. - Although only one
firing head 20 connected above the perforatingguns 22 is depicted inFIG. 1 , it will be appreciated that any number or position of firing head(s) may be used, as desired. For example, thefiring head 20 could be connected at a lower end of theperforating assembly 12, multiple firing heads could be used, a separate firing head could be used for each perforating gun, etc. - In the
system 10, it is desired to prevent unsetting or otherwise damaging apacker 24 set in thecasing 18 above the perforatingguns 22. Thepacker 24 is used herein as one example of a type of well equipment which can be protected using the principles of this disclosure, but it should be clearly understood that any other types of well equipment (e.g., anchors, hangers, instruments, other perforating devices, etc.) may be protected in other examples. - In one unique feature of the
well system 10, ashock absorbing connection 26 is disposed between each adjacent pair of the perforatingguns 22, and a shock absorbing connection is also disposed between thefiring head 20 and the uppermost perforating gun. Theconnections 26 also allow the perforating devices (firinghead 20 and perforating guns 22) to be quickly assembled to each other prior to installing the perforatingassembly 12 in thewellbore 14. - Although a
connection 26 is depicted inFIG. 1 between each adjacent pair of the perforatingguns 22, it will be appreciated that the connections could be otherwise positioned. In other examples, some adjacent pairs of perforatingguns 22 may not have theconnections 26 between them. Thus, it is not necessary for each adjacent pair of perforatingguns 22 to have one of theconnections 26 between them, nor is it necessary for one of theconnections 26 to be positioned between thefiring head 20 and the adjacentperforating gun 22. - By interconnecting multiple
shock absorbing connections 26 in theperforating assembly 12, each connection only has to absorb shock generated due to firing of the adjacent perforating device(s), and accumulation of the shock loads along the perforating assembly is prevented, or at least beneficially mitigated. Greater or fewer numbers of theconnections 26 may be used in theperforating assembly 12 as needed to achieve a desired level of shock mitigation. - Referring additionally now to
FIG. 2 , a partially cross-sectional view of a priorart perforating assembly 28 is representatively illustrated. The perforatingassembly 28 includes the perforatingguns 22, with each perforating gun including perforatingcharges 30, acharge carrier 32 and detonatingcord 34 in a generallytubular gun body 36. - However, instead of the
shock absorbing connections 26 used in thesystem 10, theperforating assembly 28 ofFIG. 2 includes a rigid, threadedconnection 38 between the perforatingguns 22. Specifically, aconnector 40 having opposing externally-threaded ends is threaded into oneperforating gun 22, and anotherconnector 42 having opposing externally- and internally-threaded ends is threaded into anotherperforating gun 22. - When the
connectors connection 38 is made. Theconnection 38 has no shock absorbing capability, and threading theconnectors guns 22 are long and/or heavy, sometimes resulting in damage to threads on the connectors. - The improved
connection 26 used in thesystem 10 is representatively illustrated inFIG. 3 . Theconnection 26 may be used between perforatingguns 22, between a perforating gun and thefiring head 20, or between any other well tools or equipment. Theconnection 26 may also be used in perforating assemblies other than the perforatingassembly 12, and in well systems other than thewell system 10, in keeping with the principles of this disclosure. - The
connection 26 includes aconnector 44 which is attached to a perforating device (such as a perforating gun or firing head, not shown), and anotherconnector 46 which is depicted inFIG. 3 as being attached to aperforating gun 22. Theconnectors guns 22, firinghead 20 or other perforating devices or other well tools by threading or any other suitable means. - In one unique feature of the
connection 26, theconnector 44 can be inserted and pushed into theother connector 46 without threading. Once connected in this manner, anengagement device 48 prevents disconnection of theconnectors - The
engagement device 48 permits theconnector 44 to displace in one direction longitudinally toward theother connector 46, but prevents theconnector 44 from displacing in the opposite longitudinal direction relative to theconnector 46. Thus, theconnection 26 can be longitudinally compressed, but thedevice 48 prevents the connection from being elongated longitudinally. - One benefit of this arrangement is that the perforating devices or other well tools attached to the
connectors connector 44 into theother connector 46. Another benefit of this arrangement is that detonation transfer components (such as,detonation boosters 56 attached at ends of the detonating cords 34) are brought into close proximity to each other when theconnector 44 is pushed into theother connector 46. In this manner, a connection is made in a detonation train 54 (including the detonatingcord 34,boosters 56, etc.) which extends through theconnection 26. - Another unique feature of the
connection 26 is that it includesshock absorbers connectors shock absorbers connection 26. - The
shock absorbers shock absorbers - The
shock absorbers FIG. 3 , or they could have any other shapes, such as round, square, T- or I-shaped cross-sections, etc. The size, shape, material and/or other characteristics of theshock absorbers assembly 12, position in the well, size and length of the adjacent perforating devices or other well tools, etc. - Although two
shock absorbers connection 26 example ofFIG. 3 , in other examples different numbers of shock absorbers (including one) may be used. In addition, although inFIG. 3 thedetonation train 54 is depicted as extending through theshock absorbers - Since the
connection 26 allows for longitudinal compression of theconnectors shock absorbers connection 26 is prevented, or is at least significantly mitigated. - Referring additionally now to
FIG. 4 , an enlarged scale cross-sectional view of theengagement device 48 is representatively illustrated. As depicted inFIG. 4 , theengagement device 48 comprises a segmented or longitudinally splitsleeve 58 having a series of relatively coarse pitch ramp-type profiles 60 on an exterior thereof, and a series of relatively fine pitch profiles 62 on an interior thereof. - The
profiles engagement device 48, with therespective connectors profiles 60 could be formed as 45-degree buttress threads, and theprofiles 62 could be formed as a “phonograph” finish (very fine grooves). - However, it should be understood that, preferably, the
connectors engagement device 48. Instead, theconnector 44 is preferably pushed into the connector 46 (without rotating or threading either connector), and theengagement device 48 prevents theconnector 44 from being withdrawn from theconnector 46. - In the example of
FIG. 4 , this result is accomplished due to the ramped interface between theprofiles 60 and theconnector 46, and gripping of theconnector 44 by theprofiles 62. A further enlarged scale view of this engagement between theconnectors device 48 is representatively illustrated inFIG. 5 . - If a tensile load is applied across the
connection 26, theprofiles 62 will grip the outer surface of theconnector 44, so that thesleeve 58 attempts to displace with theconnector 44. However, the ramps of theprofiles 60, in engagement with theconnector 46, prevent downward (as viewed inFIG. 5 ) displacement of theconnector 44 andsleeve 58, and cause the sleeve to be compressed radially inward. - The inward compression of the
sleeve 58 causes theprofiles 62 to more securely grip the outer surface of theconnector 44. Thesleeve 58 can be formed with a C-shaped lateral cross-section, so that it can be readily deformed inward. Thesleeve 58 can also be deformed radially outward, if desired, so that it no longer grips the outer surface of theconnector 44, thereby allowing theconnector 44 to be withdrawn from theconnector 46, for example, to disassemble the perforatingassembly 12 after firing, after a misfire, etc. - Although the
connection 26 is described above as having multiple benefits (e.g., speed of connecting, lack of threadingconnectors detonation train 54 connecting, etc.), it is not necessary for all of the above-described benefits to be incorporated into a single connection embodying principles of this disclosure. Theconnection 26 could include one of the above-described benefits, any subset of those benefits, and/or other benefits. - Referring additionally now to
FIG. 6 , another configuration of thewell system 10 is representatively illustrated. In this configuration, theconnections 26 are used to prevent or mitigate shock being transmitted to various well tools 64 a-c interconnected in awell tool assembly 66 positioned in thewellbore 14. - In this example, the
well tool 64 a comprises an instrument carrier (containing, for example, one or more pressure and/or temperature sensors, etc.), thewell tool 64 b comprises a fluid sampler (e.g., with chambers therein for containing selectively filled fluid samples), and thewell tool 64 c comprises an electronics module (e.g., used for receiving, storing and/or transmitting data, commands, etc., measuring parameters, etc.). However, it should be clearly understood that these are merely examples of well tools which can benefit from the principles of this disclosure, and any type of well tool may be used in theassembly 66 in keeping with those principles. - It is not necessary for the
assembly 66 to include multiple well tools. Instead, a single well tool may benefit from use of theconnections 26. - It is not necessary for the
connections 26 to be used on both ends of each of the well tools 64 a-c as depicted inFIG. 6 . Instead, aconnection 26 may be used on only one end of a well tool, or in positions other than the ends of a well tool. - In the example of
FIG. 6 , theconnections 26 prevent or mitigate shock being transmitted to the well tools 64 a-c interconnected in theassembly 66, and also allow the well tools to be interconnected in the assembly quickly and without threading. Note that the firinghead 20, perforatingguns 22 andpacker 24 described above are also examples of well tools which can benefit from use of theconnection 26. - It may now be fully appreciated that the above disclosure provides several advancements to the art. The
connection 26 depicted in FIGS. 1 & 3-6 allows for shock loads to be absorbed or at least mitigated between perforating devices or other well tools, and allows perforating devices and other well tools to be connected to each other quickly and without threading. - A method described above can include interconnecting a well tool 64 a-c in a
well tool assembly 66 with ashock mitigating connection 26, the interconnecting being performed without threading, and positioning thewell tool assembly 66 in awellbore 14. - The
connection 26 may comprise at least oneshock absorber connectors connection 26 may comprise asleeve 58 having relatively coarse pitch profiles 60 on one side, and thesleeve 58 having relatively fine pitch profiles 62 on an opposite side. - Interconnecting can include pushing one
connector 44 into anotherconnector 46 without threading theconnectors connectors engagement device 48 may permit relative displacement between theconnectors connectors - The well tool may be one or more of a perforating
gun 22, a firinghead 20, apacker 24, aninstrument carrier 64 a, afluid sampler 64 b and anelectronics module 64 c. - A well perforating
assembly 12 described above can include at least two perforating devices (such as firinghead 20, perforatinggun 22, etc.), adetonation train 54 extending through the perforatingdevices shock absorber devices - The
shock absorber devices - The
detonation train 54 may extend longitudinally through theshock absorber - The perforating devices may comprise perforating
guns 22. The perforating devices may comprise a perforatinggun 22 and a firinghead 20. - The
assembly 12 can include aconnection 26 between the perforatingdevices engagement device 48 of theconnection 26 may permit longitudinal compression of theconnection 26, but prevent elongation of theconnection 26. - The
connection 26 can compriseconnectors engagement device 48 may permit relative displacement between theconnectors connectors - The
connectors connectors detonation train 54 may extend through theconnectors - Also described above is a method of assembling a perforating
assembly 12. The method can include, prior to installing the perforatingassembly 12 in awellbore 14, pushing oneperforating device connector 44 into another perforatingdevice connector 46 without threading theconnectors connectors detonation train 54. - The method can also include positioning a
shock absorber connectors shock absorber perforating device detonation train 54 may extend longitudinally through theshock absorber - Each, or at least one, of the perforating
device connectors gun 22. At least one of the perforatingdevice connectors head 20. - The above disclosure also provides to the art a
well system 10. Thewell system 10 can comprise a perforatingassembly 12 including multiple perforatingguns 22 andmultiple shock absorbers - Each
shock absorber guns 22. Eachshock absorber connector 44 to another 46, the connectors being longitudinally compressible but prevented from elongating. Adetonation train 54 may extend through theshock absorbers - It is to be understood that the various embodiments of the present disclosure described herein may be utilized in various orientations, such as inclined, inverted, horizontal, vertical, etc., and in various configurations, without departing from the principles of the present disclosure. The embodiments are described merely as examples of useful applications of the principles of the disclosure, which is not limited to any specific details of these embodiments.
- In the above description of the representative embodiments of the disclosure, directional terms, such as “above,” “below,” “upper,” “lower,” etc., are used merely for convenience in referring to the accompanying drawings.
- Of course, a person skilled in the art would, upon a careful consideration of the above description of representative embodiments of the disclosure, readily appreciate that many modifications, additions, substitutions, deletions, and other changes may be made to the specific embodiments, and such changes are contemplated by the principles of the present disclosure. Accordingly, the foregoing detailed description is to be clearly understood as being given by way of illustration and example only, the spirit and scope of the present invention being limited solely by the appended claims and their equivalents.
Claims (20)
1-2. (canceled)
3. A method, comprising:
interconnecting a well tool in a well tool assembly with a shock mitigating connection which includes a sleeve having relatively coarse pitch profiles on one side, and the sleeve having relatively fine pitch profiles on an opposite side, the interconnecting being performed without threading; and
positioning the well tool assembly in a wellbore.
4. (canceled)
5. A method, comprising:
interconnecting a well tool in a well tool assembly with a shock mitigating connection by pushing one connector into another connector without threading the connectors together, and engaging an engagement device that permits relative displacement between the connectors in one longitudinal direction, but prevents relative displacement between the connectors in an opposite longitudinal direction, thereby preventing disconnection of the connectors; and
positioning the well tool assembly in a wellbore.
6-11. (canceled)
12. A well perforating assembly, comprising:
at least two perforating devices;
a connection between the perforating devices;
an engagement device that permits longitudinal compression of the connection, but prevents elongation of the connection;
a detonation train extending through the perforating devices; and
a shock absorber positioned between the perforating devices.
13. The assembly of claim 12 , wherein the connection comprises connectors attached to the respective perforating devices, and wherein the engagement device permits relative displacement between the connectors in one longitudinal direction, but prevents relative displacement between the connectors in an opposite longitudinal direction.
14. The assembly of claim 13 , wherein the connectors are connected to each other without threading together the connectors.
15. The assembly of claim 13 , wherein the detonation train extends through the connectors.
16. A method of assembling a perforating assembly, the method comprising:
prior to installing the perforating assembly in a wellbore, pushing one perforating device connector into another perforating device connector without threading the connectors together, thereby: a) preventing disconnection of the connectors and b) making a connection in a detonation train.
17. The method of claim 16 , further comprising positioning a shock absorber between the connectors.
18. The method of claim 17 , wherein the shock absorber absorbs longitudinally directed shock generated by firing at least one perforating device.
19. The method of claim 17 , wherein the detonation train extends longitudinally through the shock absorber.
20. The method of claim 16 , wherein each of the perforating device connectors is attached to a perforating gun.
21. The method of claim 16 , wherein at least one of the perforating device connectors is attached to a perforating gun.
22. The method of claim 16 , wherein at least one of the perforating device connectors is attached to a firing head.
23. The method of claim 16 , wherein an engagement device permits relative displacement between the connectors in one longitudinal direction, but prevents relative displacement between the connectors in an opposite longitudinal direction.
24. A well system, comprising:
a perforating assembly including multiple perforating guns and multiple shock absorbers, and wherein each shock absorber is interconnected between at least two of the perforating guns.
25. The well system of claim 24 , wherein each shock absorber mitigates transmission of shock from one connector to another, the connectors being longitudinally compressible but prevented from elongating.
26. The well system of claim 24 , wherein a detonation train extends through the shock absorbers.
Priority Applications (3)
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US13/413,588 US20120241169A1 (en) | 2011-03-22 | 2012-03-06 | Well tool assemblies with quick connectors and shock mitigating capabilities |
US13/430,550 US9206675B2 (en) | 2011-03-22 | 2012-03-26 | Well tool assemblies with quick connectors and shock mitigating capabilities |
US13/848,632 US8875796B2 (en) | 2011-03-22 | 2013-03-21 | Well tool assemblies with quick connectors and shock mitigating capabilities |
Applications Claiming Priority (3)
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USPCT/US11/29412 | 2011-03-22 | ||
PCT/US2011/029412 WO2012128759A1 (en) | 2011-03-22 | 2011-03-22 | Well tool assemblies with quick connectors and shock mitigating capabilities |
US13/413,588 US20120241169A1 (en) | 2011-03-22 | 2012-03-06 | Well tool assemblies with quick connectors and shock mitigating capabilities |
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US20120241170A1 (en) | 2012-09-27 |
US8875796B2 (en) | 2014-11-04 |
US20130213668A1 (en) | 2013-08-22 |
US9206675B2 (en) | 2015-12-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: HALLIBURTON ENERGY SERVICES, INC., TEXAS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HALES, JOHN H.;BURLESON, JOHN D.;MARTINEZ, SAMUEL;REEL/FRAME:027816/0015 Effective date: 20110324 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |