CN115680547A - Combined type setting back pressure valve device, tool pipe string and application thereof - Google Patents
Combined type setting back pressure valve device, tool pipe string and application thereof Download PDFInfo
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- CN115680547A CN115680547A CN202211413016.6A CN202211413016A CN115680547A CN 115680547 A CN115680547 A CN 115680547A CN 202211413016 A CN202211413016 A CN 202211413016A CN 115680547 A CN115680547 A CN 115680547A
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- 238000007789 sealing Methods 0.000 claims abstract description 155
- 239000012530 fluid Substances 0.000 claims abstract description 63
- 239000002131 composite material Substances 0.000 claims abstract description 47
- 230000007246 mechanism Effects 0.000 claims abstract description 19
- 230000000149 penetrating effect Effects 0.000 claims abstract description 10
- 238000005553 drilling Methods 0.000 claims description 25
- 239000007788 liquid Substances 0.000 claims description 20
- 238000010008 shearing Methods 0.000 claims description 13
- 230000001681 protective effect Effects 0.000 claims description 12
- 238000013461 design Methods 0.000 abstract description 17
- 238000010276 construction Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 8
- 238000011010 flushing procedure Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000002265 prevention Effects 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 239000004568 cement Substances 0.000 description 4
- 230000000087 stabilizing effect Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 2
- 238000009991 scouring Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention provides a combined type setting back pressure valve device, a tool pipe string and application thereof, wherein the back pressure valve device comprises a shell assembly, a setting assembly and a back pressure valve assembly, and the shell assembly comprises a shell; the setting assembly comprises a self-sealing pipe, an inner sleeve and a locking mechanism; the self-sealing pipe penetrates through the shell, the upper end of the self-sealing pipe is fixedly connected with the shell component, and a gap through which fluid can pass is formed between the self-sealing pipe and the shell; the inner sleeve is arranged in the self-sealing pipe in a penetrating way and is fixedly connected with the self-sealing pipe; the inner sleeve is provided with a first side hole, the self-sealing pipe is provided with a second side hole, and gaps among the inner sleeve, the first side hole, the second side hole, the self-sealing pipe and the shell are communicated with each other to form a fluid channel; the inner sleeve can move downwards to cut off the fluid channel and is locked by the locking mechanism after being subjected to axial force; the back pressure valve assembly penetrates through the shell and is fixedly connected with the lower end of the inner sleeve, and the back pressure valve assembly can move along the axis of the shell along with the inner sleeve. The composite structure has the advantages of ingenious design, multifunction and more reliable sealing.
Description
Technical Field
The invention relates to the technical field of downhole tools for oil and gas field exploration and development, in particular to a combined type setting back pressure valve device, a tool pipe string and application thereof.
Background
In the construction of drilling and completion operations of oil fields, the back pressure valve is used as an important internal blowout prevention tool, is equivalent to a check valve, and is used for preventing cement slurry from flowing back after well cementation during well cementation, and the upward return height of the cement slurry outside a casing is ensured, so that the well cementation quality is ensured; when the well is completed, the device is used for preventing liquid with over-high bottom pressure from flowing back into the oil pipe, and ensures subsequent construction operation. Therefore, the construction operation needs to be ensured in the forward direction, the inner hole of the pipe column needs to be plugged in the reverse direction, and the normal work of the back-pressure valve is very critical. The traditional back-pressure valve has the advantages that when liquid in a pipe positively flows to the bottom of the well, the conical surface sealing element is always in a flushed state and generally does not have air sealing performance, for example, the Chinese utility model patent with the publication number of CN2874166 discloses a two-way back-pressure valve structure, the back-pressure valve comprises a cylindrical valve body, the upper end and the lower end of the valve body are provided with conical threads which can be respectively matched with a square drill rod and a drill rod, a valve core capable of moving up and down is arranged in an inner cavity of the valve body, a sealing gasket is arranged between the conical surface at the upper end of the valve core and an inlet at the upper section of the inner cavity of the valve body, the valve core is provided with a hollow inner cavity with a downward opening, a piston is arranged in the inner cavity of the valve core, a compression spring is arranged between the top of the piston and the top surface of the inner cavity of the valve core, the lower section of the piston is axially positioned in the inner cavity of the valve body, a slurry channel is arranged at the lower section of the piston, and a through hole is arranged on the outer wall of the lower section of the valve core. The sealing element is arranged in the fluid channel in the structure, and the sealing element is flushed by fluid for a long time in the using process, so that the service life of the back pressure valve is greatly influenced.
Disclosure of Invention
The present invention aims to address at least one of the above-mentioned deficiencies of the prior art. For example, an object of the present invention is to provide a composite setting back pressure valve device, a tool string and applications thereof, wherein the composite setting back pressure valve device adopts a design of a self-sealing setting assembly and a side hole back pressure valve assembly, so as to effectively solve the technical problems that a sealing member of a back pressure valve in the prior art is not resistant to flushing and the back pressure valve does not have air-tight performance, and to exert a second back pressure sealing function when the back pressure valve fails to seal.
In order to achieve the above object, the present invention provides a composite setting back pressure valve device, including a housing assembly, a setting assembly and a back pressure valve assembly, wherein the housing assembly includes a housing; the setting assembly comprises a self-sealing pipe, an inner sleeve and a locking mechanism; the self-sealing pipe is arranged in the shell in a penetrating way, and a gap through which fluid can pass is formed between the self-sealing pipe and the shell; the inner sleeve is arranged in the self-sealing pipe in a penetrating way and is fixedly connected with the self-sealing pipe; the side wall of the inner sleeve is provided with a plurality of first side holes which are radially communicated, the side wall of the self-sealing pipe is provided with second side holes which can be in one-to-one correspondence with the first side holes, and the inner cavity of the inner sleeve, the first side holes, the second side holes, the gaps among the self-sealing pipe and the shell are communicated with each other to form a fluid channel; the locking mechanism is arranged between the self-sealing pipe and the inner sleeve; the inner sleeve can move downwards along the self-sealing pipe to cut off the fluid passage and is axially locked by the locking mechanism after being subjected to the axial force exceeding the set threshold value; the back pressure valve assembly is arranged in the shell in a penetrating mode and is fixedly connected with the lower end of the inner sleeve, and the back pressure valve assembly can move along the axis of the shell along with the inner sleeve.
Alternatively, the locking mechanism may include a bearing head, a locking ring sleeved outside the inner sleeve, a lower end of the locking ring abutting against an upper end of the bearing head, and a groove provided on an outer wall of the inner sleeve and located above the locking ring, wherein the inner sleeve is capable of moving downward relative to the locking ring and clamping the locking ring into the groove to achieve axial locking of the inner sleeve.
Alternatively, the upper end of the inner wall of the inner sleeve may be formed with a tapered stepped surface capable of fixing the soluble ball thrown into the back pressure valve device at the upper end of the inner sleeve and preventing the soluble ball from moving downward along the inner cavity of the inner sleeve.
Optionally, the setting assembly may further include a plurality of starting shear pins, the starting shear pins are simultaneously inserted into the side walls of the self-sealing pipe and the inner sleeve to fixedly connect the self-sealing pipe and the inner sleeve, and the starting shear pins can be sheared after the inner sleeve is subjected to an axial force exceeding a set threshold.
Optionally, the back pressure valve assembly may include a valve body and a valve core, the upper end of the valve body is fixedly connected with the lower end of the inner sleeve and sleeved outside the valve core, and a valve cavity for fluid to flow is formed between the valve body and the valve core; the valve core comprises a valve core upper section and a valve core lower section, the valve core upper section is arranged in the inner sleeve in a penetrating mode, the valve core upper section is provided with a blind hole along the axial direction, the side wall of the valve core upper section is provided with a plurality of through third side holes, and the third side holes and the blind hole are communicated with the inner cavity of the inner sleeve.
Optionally, the back pressure valve assembly may further include an elastic element and an elastic element support, the elastic element support is fixedly connected to the lower end of the valve body and sleeved on the lower valve element segment, the elastic element support is provided with a plurality of liquid passing holes which are vertically through, the elastic element is sleeved on the lower valve element segment, the upper end of the elastic element is abutted to a step formed between the upper valve element segment and the lower valve element segment, and the lower end of the elastic element is abutted to the elastic element support.
Optionally, the back pressure valve assembly may further include a shear ring and a protective sleeve, the shear ring is inserted into the elastic member support and is fixedly connected to the elastic member support, an upper end of the shear ring abuts against a lower end of the valve core, and the shear ring is capable of dropping in the axial direction of the elastic member support after receiving an axial force exceeding a set threshold; the protective sleeve is fixedly connected with the lower end of the elastic part support, the minimum inner diameter of the protective sleeve is larger than the outer diameter of the shearing ring, and the protective sleeve can receive the falling shearing ring.
Optionally, the back pressure valve assembly may further include a plurality of valve core shear pins, the valve core shear pins are simultaneously inserted into the side walls of the elastic member support and the shear ring to fixedly connect the elastic member support and the shear ring, and the valve core shear pins can be sheared after the shear ring receives an axial force exceeding a set threshold.
Optionally, the housing assembly may further include an upper joint and a lower joint, a lower end of the upper joint is fixedly connected to the housing and an upper end of the self-sealing pipe, and an upper end of the lower joint is fixedly connected to a lower end of the housing.
Optionally, a sealing element may be disposed at a joint of the upper joint and the housing, a joint of the lower joint and the housing, a joint of the self-sealing pipe and the housing assembly, a joint of the self-sealing pipe and the inner sleeve, and a joint of the inner sleeve and the valve core.
The invention also provides an application of the composite setting back pressure valve device in drilling operation, which can complete setting to avoid upward return flow of drilling fluid below the composite setting back pressure valve device when the back pressure valve below the composite setting back pressure valve device fails, open the back pressure valve assembly to communicate the tool pipe string and prevent return flow again through suppressing pressure above the composite setting back pressure valve device, and realize double back pressure sealing effect.
In yet another aspect, the invention provides a tool string comprising the composite setting back pressure valve device as described above, as well as an upper string, a lower back pressure valve, a screen, a guide shoe, and the like.
Compared with the prior art, the beneficial effects of the invention comprise at least one of the following:
1. the self-sealing setting assembly and the side-hole type back-pressure valve are integrated into a composite structure, so that the function of the setting assembly is combined with that of the back-pressure valve, the liquid circulation communication function is realized by the self-sealing setting assembly during construction operation, namely, fluid does not pass through the side-hole type back-pressure valve, the side-hole type back-pressure valve does not work at the moment, the opening of the side-hole type back-pressure valve is controllable due to the design, and the sealing element of the side-hole type back-pressure valve is protected from being washed by liquid completely. The composite structure is ingenious in design, and the multifunctional sealing device has multiple functions and is more reliable in sealing.
2. The invention designs a valve core side hole sealing structure, a composite back pressure valve is upgraded from axial hole sealing to radial side hole sealing, when the opening state of the composite back pressure valve is established to be in a positive circulation state, the direction of fluid is changed through a valve core with a side hole, the direct flushing of the fluid on a sealing part in the axial hole sealing design is avoided, the fluid can be prevented from flushing and damaging a sealing element, the effect of protecting the sealing element is achieved, and the composite back pressure valve has the characteristics of anti-flushing and good sealing effect.
3. When the back-pressure valve at the lower part of the pipe string fails, the side hole type back-pressure valve component can be opened to communicate the pipe string and prevent backflow again. The spare side hole type back pressure valve is just the second back pressure prevention line of the tool pipe string, and the construction pipe string is ensured to be safer and more reliable.
4. The invention adopts the design of realizing sealing by the inner side sealing element and the outer side sealing element, and realizes the air sealing performance by the standard sealing element in the air sealing industry. The structure is simple in design and safe and reliable in sealing.
Drawings
The above and other objects and/or features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:
fig. 1 shows an initial state diagram of a composite set back pressure valve device before setting in accordance with an exemplary embodiment of the present invention.
Fig. 2 shows a closed state diagram of the composite set back pressure valve device after setting of the back pressure valve according to an exemplary embodiment of the present invention.
Fig. 3 shows a diagram of the opening state of the back pressure valve after the composite setting back pressure valve device is set according to the exemplary embodiment of the invention.
Fig. 4 shows a partial enlargement at i in fig. 1.
Fig. 5 shows a partial enlargement at ii in fig. 2.
Description of reference numerals:
1-housing component, 11-housing, 12-upper joint, 13-lower joint;
2-setting component, 21-inner sleeve, 211-first side hole, 212-conical step surface, 22-self-sealing tube, 221-second side hole, 23-locking mechanism, 231-bearing head, 232-locking ring, 233-groove, 24-starting shear pin;
3-a back pressure valve component, 31-a valve body, 32-a valve core, 321-an upper valve core section, 3211-a blind hole, 3212-a third side hole, 322-a lower valve core section, 33-an elastic piece, 34-an elastic piece support, 341-a liquid passing hole, 35-a shear ring, 36-a protective sleeve and 37-a valve core shear pin;
4-sealing element, 5-soluble ball and 6-stable nail.
Detailed Description
Hereinafter, a composite setting back pressure valve device, a tool string and applications thereof according to the present invention will be described in detail with reference to exemplary embodiments.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the construction of drilling and completion operations of oil fields, the back pressure valve is used as an important internal blowout prevention tool, is equivalent to a check valve, and is used for preventing cement slurry from flowing back after well cementation during well cementation, and the upward return height of the cement slurry outside a casing is ensured, so that the well cementation quality is ensured; when the well is completed, the device is used for preventing liquid with over-high bottom pressure from flowing back into the oil pipe, and ensures subsequent construction operation. Therefore, the construction operation needs to be ensured in the forward direction, the inner hole of the pipe column needs to be plugged in the reverse direction, and the normal work of the back pressure valve is very critical. In the related art, when liquid in the pipe positively flows to the bottom of the well through the back pressure valve, the sealing element in the structure is arranged in the fluid channel, so that the sealing element is washed by the fluid for a long time in the use process, the service life of the back pressure valve is greatly influenced, and the back pressure valve generally does not have air sealing performance due to the limitation of the structure.
Based on the above, the invention provides a combined type setting back pressure valve device, which comprises a shell assembly, a setting assembly and a back pressure valve assembly, wherein the shell assembly comprises a shell; the setting assembly comprises a self-sealing pipe, an inner sleeve and a locking mechanism; the self-sealing pipe penetrates through the shell, the upper end of the self-sealing pipe is fixedly connected with the shell component, and a gap through which fluid can pass is formed between the self-sealing pipe and the shell; the inner sleeve is arranged in the self-sealing pipe in a penetrating way and is fixedly connected with the self-sealing pipe; the side wall of the inner sleeve is provided with a plurality of first side holes which are radially communicated, the side wall of the self-sealing pipe is provided with second side holes which can be in one-to-one correspondence with the first side holes, and the inner cavity of the inner sleeve, the first side holes, the second side holes, the gaps among the self-sealing pipe and the shell are communicated with each other to form a fluid channel; the locking mechanism is arranged between the self-sealing pipe and the inner sleeve; the inner sleeve can move downwards along the self-sealing pipe to cut off the fluid channel and is axially locked by the locking mechanism after being subjected to the axial force exceeding a set threshold value; the back pressure valve assembly penetrates through the shell and is fixedly connected with the lower end of the inner sleeve, and the back pressure valve assembly can move along the axis of the shell along with the inner sleeve.
According to the combined type setting back pressure valve device, a self-sealing setting assembly and a side hole type back pressure valve integrated composite structure is adopted, the function combination of the setting assembly and the back pressure valve is realized, the liquid circulation communication function is realized by the self-sealing setting assembly during construction operation, namely, fluid does not pass through the side hole type back pressure valve, the side hole type back pressure valve does not work at the moment, the opening of the side hole type back pressure valve is controllable due to the design, and the sealing element of the side hole type back pressure valve is protected from being washed by liquid completely; when the setting component of the back-pressure valve device is set, the axial hole sealing is upgraded to the radial side hole sealing, when the opening state of the composite body back-pressure valve is set up to be in a normal circulation state, the direction of the fluid is changed through the valve core with the side hole, the direct scouring of the fluid on the sealing part in the axial hole sealing design is avoided, the fluid scouring damage on the sealing element can be prevented, and the effect of protecting the sealing element is achieved.
Exemplary embodiment 1
The present exemplary embodiment provides a composite setting back pressure valve device.
Fig. 1 shows an initial state diagram before setting of a combined type setting back pressure valve device according to an exemplary embodiment of the invention, fig. 2 shows a closed state diagram of a back pressure valve after setting of the combined type setting back pressure valve device according to the exemplary embodiment of the invention, fig. 3 shows an open state diagram of the back pressure valve after setting of the combined type setting back pressure valve device according to the exemplary embodiment of the invention, fig. 4 shows a partial enlarged view of a point i in fig. 1, and fig. 5 shows a partial enlarged view of a point ii in fig. 2.
As shown in fig. 1 to 5, the combined setting back pressure valve device of the present invention may include a housing assembly 1, a setting assembly 2, a back pressure valve assembly 3, and a sealing member 4, wherein the housing assembly may include an upper joint 12, a housing 11, and a lower joint 13, which are sequentially connected from top to bottom.
In this embodiment, the housing 11 may have a straight cylindrical structure, and the upper joint 12 and the lower joint 13 may be fixedly connected to the housing 11 by threads, respectively, but the present invention is not limited thereto, and the housing 11 may have other non-cylindrical structures such as a square cylindrical shape, and the connection manner between the upper joint 12 and the housing 11 and the lower joint 13 may be other fixed connection manners such as welding and integral molding.
In this embodiment, the setting assembly 2 may include an inner sleeve 21, a self-sealing tube 22, a locking mechanism 23, and a starting shear pin 24, wherein an upper end of the self-sealing tube 22 may extend into the lower end of the upper joint 12 and be fixedly connected to the upper joint 12 through a thread, the whole self-sealing tube 22 is inserted into the housing 11, and an outer diameter of the self-sealing tube 22 is smaller than an inner diameter of the housing 11, that is, an annular gap is formed between the self-sealing tube 22 and the housing 11; the inner sleeve 21 penetrates through the self-sealing tube 22 and can be fixedly connected with the self-sealing tube 22 in an initial state, but when the inner sleeve 21 is subjected to an axial force exceeding a set threshold value, the inner sleeve can move downwards along the axial direction of the self-sealing tube; the outer wall of the inner sleeve 21 and the inner wall of the self-sealing tube 22 are in contact with each other, that is, the inner sleeve 21 and the self-sealing tube 22 are fixed in the radial direction.
Further, the sidewall of the inner sleeve 21 is provided with 4 first side holes 211, the sidewall of the self-sealing tube 22 is also provided with second side holes 221 corresponding to the 4 first side holes 211 one by one, when the relative positions of the inner sleeve 21 and the self-sealing tube 22 are in the initial state, the 4 first side holes 211 and the 4 corresponding second side holes 221 can be communicated with each other, that is, the inner cavity of the inner sleeve 21, the gap formed between the self-sealing tube 22 and the housing 11 can be communicated through the first side holes 211 and the second side holes 221 to form a fluid channel, but the invention is not limited thereto, the number of the first side holes 211 can be other positive integers than 4, the number of the second side holes 221 can be other positive integers than 4, as long as the first side holes 211 and the second side holes 221 can be communicated one by one when the relative positions of the inner sleeve 21 and the self-sealing tube 22 are in the initial state.
Further, the upper end of the inner sleeve 21 may be formed with a tapered step surface 212 recessed downward, the inner side and the outer side of the tapered step surface 212 may be connected to the inner wall and the outer wall of the inner sleeve 21, respectively, and after the soluble ball 5 is dropped into the composite setting back pressure valve device from the opening at the upper end of the upper joint 12, the soluble ball 5 may fall to the upper end of the inner sleeve 21, and since the initial diameter of the soluble ball 5 is larger than the inner diameter at the upper end of the inner sleeve 21, the soluble ball 5 may be automatically fixed at the connection between the tapered step surface 212 and the inner wall at the upper end of the inner sleeve 21.
In this embodiment, the locking mechanism 23 may include a bearing head 231, a locking ring 232 and a groove 233, wherein the bearing head 231 is sleeved at the lower end of the inner sleeve 21, the inner wall of the bearing head 231 fits the outer wall of the inner sleeve 21, and also penetrates the lower end of the self-sealing tube 22 and is fixedly connected to the self-sealing tube 22 through the fixing nail 6, and the outer wall of the bearing head 231 fits the inner wall of the self-sealing tube 22, that is, the bearing head 231 is located between the self-sealing tube 22 and the inner sleeve 21 in the radial direction, but the invention is not limited thereto, and the bearing head 231 and the self-sealing tube 22 may also be connected through other fixing connection means such as screws, bolts or threads.
Further, the lock ring 232 is arranged above the carrier head 231 and sleeved outside the inner sleeve 21, and is also located between the self-sealing pipe 22 and the inner sleeve 21 in the radial direction, and the lower end of the lock ring 232 abuts against the upper end of the carrier head 231; the groove 233 is formed in the outer wall of the inner sleeve 21, that is, the groove 233 is an annular groove formed in the circumferential direction of the outer wall of the inner sleeve 21.
When the relative position of the inner sleeve 21 and the self-sealing pipe 22 is in an initial state, the groove 233 is located above the lock ring 232, and after the inner sleeve 21 moves downwards under the action of a downward axial force, the bearing head 231 and the lock ring 232 can move upwards relative to the inner sleeve 21 until the lock ring 232 is clamped into the groove 233, the composite setting back pressure valve device completes setting, at which time the axial position of the inner sleeve 21 and the self-sealing pipe 22 remains fixed, and the inner sleeve 21 cannot move upwards again to return to the initial position before setting.
Further, the locking mechanism 23 is not limited to the structure comprising the bearing head 231, the locking ring 232 and the groove 233, and the locking mechanism in the present invention may also comprise other types of structures that can fix the inner sleeve 21 that is going downwards and the self-sealing pipe 22 axially to complete the setting and can not reset the inner sleeve 21 that is going upwards.
Further, the starting shear pins 24 are simultaneously inserted into the side walls of the upper ends of the self-sealing pipe 22 and the inner sleeve 21, and the self-sealing pipe 22 and the inner sleeve 21 are fixedly connected to keep the self-sealing pipe 22 and the inner sleeve 21 axially fixed in the initial state before setting, in this embodiment, the number of the starting shear pins 24 is 4, and the 4 starting shear pins are uniformly distributed along the circumferential direction of the self-sealing pipe 22, but the present invention is not limited thereto, and the number of the starting shear pins 24 may also be other positive integers than 4, and when the number of the starting shear pins 24 is greater than 1, the starting shear pins may also be non-uniformly distributed along the circumferential direction of the self-sealing pipe 22.
Further, when the downward axial force applied to the inner sleeve 21 is greater than the maximum load that can be borne by the starting shear pin 24, the starting shear pin 24 will be sheared, and the inner sleeve 21 can move downward along the axial direction of the self-sealing pipe 22 until the inner sleeve 21 is locked by the locking mechanism 23, thus completing the setting of the composite setting back pressure valve device.
In this embodiment, the back pressure valve assembly 3 includes a valve body 31, a valve core 32, an elastic member 33, an elastic member support 34, a shear ring 35, a protective sleeve 36 and a valve core shear pin 37, wherein the valve body 31 is sleeved outside the outer wall of the lower end of the inner sleeve 21 and is fixedly connected with the inner sleeve 21 through a stable pin 6, but the invention is not limited thereto, and the valve body 31 and the inner sleeve 21 may also be connected through other fixed connection manners such as screws, bolts or threads.
Further, the valve core 32 includes a valve core upper section 321 and a valve core lower section 322, the valve core upper section 321 extends into the inner sleeve 21 from the lower end of the inner sleeve 21, the valve core 32 is also located in the valve body 31, a valve cavity for fluid to flow is formed between the outer wall of the valve core 32 and the inner wall of the valve body 31, a blind hole 3211 is formed in the axial direction of the valve core upper section 321, 4 third side holes 3212,4 are formed in the sidewall of the valve core upper section 321 along the circumferential direction of the valve core upper section 321 and evenly distributed, and the 4 third side holes 3212, the blind hole 3211 and the inner cavity of the inner sleeve 21 are communicated with each other, but the present invention is not limited thereto, the number of the third side holes 3212 may also be other positive integers except for 4, and when the number of the third side holes 3212 is greater than 1, the third side holes may also be unevenly distributed along the circumferential direction of the valve core upper section 321.
Furthermore, the elastic element support 34 is sleeved on the lower valve element section 322, the inner wall of the elastic element support 34 is attached to the outer wall of the lower valve element section 322, and the valve element 32 can move up and down along the axial direction of the elastic element support 34 when being subjected to axial force; the outer wall of the elastic member support 34 is formed with a step, in this embodiment, the step of the elastic member support 34 is provided with 6 liquid passing holes 341,6 penetrating up and down along the axial direction, the liquid passing holes 341 are uniformly distributed along the circumferential direction of the elastic member support 34, the 6 liquid passing holes 341 are all communicated with the valve cavity, and the fluid in the valve cavity can flow to the lower side of the elastic member support 34 along the 6 liquid passing holes 341, but the present invention is not limited thereto, the number of the liquid passing holes 341 can be other positive integers except 6, and when the number of the liquid passing holes 341 is greater than 1, the liquid passing holes can also be non-uniformly distributed along the circumferential direction of the elastic member support 34.
Further, the lower end of the protecting sleeve 36 is fixedly connected with the lower end of the elastic element support 34 through the fixing nail 6, the minimum inner diameter of the protecting sleeve 36 is smaller than the inner diameter of the lower end of the elastic element support 34, that is, the minimum inner diameter of the protecting sleeve 36 is smaller than the outer diameter of the shearing ring 35, the shearing ring 35 is installed in the elastic element support 34, the valve core shear nails 37 are simultaneously penetrated through the side walls of the elastic element support 34 and the shearing ring 35 to fixedly connect the elastic element support 34 with the shearing ring 35, in this embodiment, the number of the valve core shear nails 37 is 4, and the 4 valve core shear nails 37 are uniformly distributed along the circumferential direction of the elastic element support 34, but the invention is not limited thereto, the number of the valve core shear nails 37 may also be other positive integers except for 4, and when the number of the valve core shear nails 37 is greater than 1, the valve core shear nails may also be non-uniformly distributed along the circumferential direction of the elastic element support 34.
The upper end of the shearing ring 35 can be abutted against the lower end of the valve core 32, when the downward axial force applied to the valve core 32 is greater than the maximum load capable of being borne by the valve core shearing nail 37, the valve core shearing nail 37 is sheared, the shearing ring 35 falls to the upper end of the protecting sleeve 36 and is received by the protecting sleeve 36, and after the shearing ring 35 falls off, the valve core 32 can move up and down along the axial direction of the elastic element support 34.
Further, a valve core step is formed between the valve core upper section 321 and the valve core lower section 322, the elastic member 33 is sleeved on the valve core lower section 322, the upper end of the elastic member 33 is abutted with the lower end of the valve core step, the lower end of the elastic member 33 is abutted with the upper end of the step of the elastic member support 34, when the valve core 32 is subjected to a downward axial force which is greater than the upward elastic force of the elastic member 33, the valve core 32 can move downward along the axial direction and compress the elastic member 33, and the back pressure valve assembly 3 can be adjusted to an open state from a closed state; when the axial force applied to the valve core 32 is smaller than the upward elastic force of the elastic member 33, the elastic member 33 rebounds, the valve core 32 returns to the upward position, and the back pressure valve assembly 3 can be restored from the open state to the closed state.
In this embodiment, the sealing members 4 are respectively installed at the joint between the housing 11 and the upper joint 12, the joint between the upper joint 12 and the self-sealing tube 22, the joint between the self-sealing tube 22 and the inner sleeve 21, the joint between the inner sleeve 21 and the valve core 32, and the joint between the housing 11 and the lower joint 13. The sealing element 4 installed at the connection position of the inner sleeve 21 and the valve core 32 forms a fluid passage with the inner sleeve 21, the third side hole 3212 and the valve cavity when the back pressure valve assembly 3 is in an open state, so that fluid cannot be flushed to the sealing element 4, and the sealing performance of the back pressure valve assembly 3 cannot be affected by damage to the sealing element 4.
In this embodiment, the composite seat back pressure valve device further includes stabilizing nails 6, the stabilizing nails 6 are respectively installed at the joints of the upper joint 12 and the housing 11, the joints of the housing 11 and the lower joint 13, the joints of the upper joint 12 and the self-sealing pipe 22, the joints of the self-sealing pipe 22 and the carrier head 231, the joints of the inner sleeve 21 and the valve body 31, the joints of the valve body 31 and the elastic support 34, and the joints of the elastic support 34 and the protective sleeve 36, and the number of the stabilizing nails 6 at each joint is 2, but the present invention is not limited thereto, the number of the stabilizing nails 6 at each joint may also be other positive integers than 2, and the connection manner between the above components may also be other fixed connection manners such as screws, bolts, or threads, etc., other than the stable nail connection manner.
The working process of the combined setting back pressure valve device is described in detail as follows:
in the drilling operation, the combined type setting back pressure valve device is installed in the tool pipe string, the upper end of the upper joint of the combined type setting back pressure valve device is generally connected with the upper tool pipe string through threads, the lower end of the lower joint is connected with the lower back pressure valve, the sieve pipe and the guide shoe through threads, a complete tool pipe string is formed, and the pipe string is placed to a shaft bottom design position from a well head.
As shown in fig. 1, the composite setting back-pressure valve device of the present invention is in an initial state before setting, drilling fluid enters the composite setting back-pressure valve device from an opening at an upper end of the upper joint 12, at this time, gaps between the inner sleeve 21, the first side hole 211, the second side hole 221, the self-sealing tube 22 and the housing 11 are communicated to form a fluid channel, the drilling fluid can flow from the upper joint 12 to the lower joint 13 along the fluid channel and enter the back-pressure valve below the composite setting back-pressure valve device, no fluid passes through the back-pressure valve assembly 3 in the initial state before setting, that is, the back-pressure valve assembly 3 is in an unused state, the back-pressure valve assembly 3 is completely separated from the drilling fluid in the composite setting back-pressure valve device, and at this time, the unidirectional sealing effect of the tool tube string is completely realized by the back-pressure valve below the composite setting back-pressure valve device.
When a back pressure valve below the composite setting and back pressure valve device fails and the function of the one-way seal of the back pressure valve fails, the composite setting and back pressure valve device needs to be used for completing setting so as to avoid the upward return of the drilling fluid, at this time, a soluble ball 5 is put into the composite setting and back pressure valve device through an upper joint 12, because the initial outer diameter of the soluble ball 5 before dissolution is larger than the inner diameter of the upper end of the inner sleeve 21, the soluble ball 5 is fixed at the upper end of the inner sleeve 21 and blocks the fluid passage, the drilling fluid cannot enter the inner sleeve 21, the pressure is gradually increased as the drilling fluid continues to be filled upwards, the axial force exerted on the inner sleeve 21 is also gradually increased, when the axial force exerted on the inner sleeve 21 is larger than the load which can be borne by the starting shear pin 24, the inner sleeve 21 starts to move downwards, a back pressure valve assembly 3 fixedly connected to the lower end of the inner sleeve 21 also moves downwards together with the inner sleeve 21 as shown in fig. 1, 2,4 and 5, when the downward groove 233 on the outer wall of the inner sleeve 21 reaches the position, the second side of the locking ring 233, the locking ring 232 is locked and the back pressure valve assembly is locked and the fluid passage 21 and the upper end of the initial setting and the drilling fluid cannot be locked again, the upper end of the composite setting and the back pressure valve device is locked again, the drilling fluid passage is locked.
With the continuous dissolution of the soluble ball 5, until the diameter of the soluble ball is smaller than the inner diameter of the inner sleeve 21, the soluble ball 5 falls into the blind hole 3211 of the valve core 32, the drilling fluid can enter the inner sleeve 21 along with the falling soluble ball, the valve core 32 also starts to receive the axial pressure applied by the drilling fluid from above, when the axial pressure continues to increase until the load that can be borne by the valve core shear pin 37 is exceeded, the valve core shear pin 37 is sheared, the shear ring falls to the protective sleeve 36, the valve core 32 starts to be pushed by the drilling fluid from above to compress the elastic member 33 and starts to descend until the third side hole 3212 on the valve core 32 is communicated with the valve cavity, the drilling fluid can enter the valve cavity from the inner sleeve 21 and flows to the lower connector 13 along the fluid passing hole 341 to flow out of the compound seat back pressure valve device, as shown in fig. 3, at this time, the back pressure valve component starts to be activated and is adjusted from the initial closed state to the open state.
When the pressure of drilling fluid below the combined type setting back pressure valve device exceeds the pressure of drilling fluid above the combined type setting back pressure valve device, the axial force applied to the valve core and the upward elastic force of the elastic piece can jointly push the valve core to reset and move upwards, after a third side hole in the valve core enters the inner sleeve, a fluid passage between the valve cavity and the inner sleeve is disconnected, the back pressure valve assembly is restored to a closed state from an open state, and at the moment, the back pressure valve assembly starts to play a one-way air sealing function to prevent the drilling fluid below from returning upwards.
Exemplary embodiment 2
The present exemplary embodiment provides for the use of the composite set back pressure valve apparatus described in exemplary embodiment 1 in drilling operations.
In the drilling operation, before setting can form initial fluid passageway among the combined type setting back pressure valve device and supply drilling fluid top-down to flow through combined type setting back pressure valve device, and initial fluid passageway and back pressure valve subassembly are separated each other, and furthest protects back pressure valve subassembly not washed by the fluid and in order to avoid inefficacy, when the back pressure valve of its below became invalid, combined type setting back pressure valve device can accomplish and set and avoid the drilling fluid of below to go up the backward flow, and the rethread top is suppressed and is opened back pressure valve subassembly communicates with instrument pipe cluster and backflow prevention once more, realizes dual back pressure sealing effect.
Exemplary embodiment 3
The present exemplary embodiment provides a tool string.
The tool string according to the exemplary embodiment includes the composite setting back pressure valve device according to the exemplary embodiment 1, and components such as an upper string above the composite setting back pressure valve device, a back pressure valve below the composite setting back pressure valve device, a screen pipe, and a guide shoe.
In summary, the self-sealing setting assembly and the side-hole type back-pressure valve are integrated into a composite structure, so that the function of the setting assembly is combined with the function of the back-pressure valve, the liquid circulation communication function is realized by the self-sealing setting assembly during construction operation, namely, fluid does not pass through the side-hole type back-pressure valve, the side-hole type back-pressure valve does not work at the moment, the opening of the side-hole type back-pressure valve is controllable due to the design, and the sealing element of the side-hole type back-pressure valve is protected from being washed by liquid. The composite structure is ingenious in design, and the multifunctional sealing device has multiple functions and is more reliable in sealing. The invention designs a valve core side hole sealing structure, a composite back pressure valve is upgraded from axial hole sealing to radial side hole sealing, when the opening state of the composite back pressure valve is established to be in a positive circulation state, the direction of fluid is changed through a valve core with a side hole, the direct flushing of the fluid on a sealing part in the axial hole sealing design is avoided, the fluid can be prevented from flushing and damaging a sealing element, the effect of protecting the sealing element is achieved, and the composite back pressure valve has the characteristics of anti-flushing and good sealing effect. When the back-pressure valve at the lower part of the pipe string fails, the side hole type back-pressure valve component can be opened to communicate the pipe string and prevent backflow again. The spare side hole type back pressure valve is just the second back pressure prevention line of the tool pipe string, and the construction pipe string is ensured to be safer and more reliable. The invention adopts the design of realizing sealing by the inner side sealing element and the outer side sealing element, and realizes the air sealing performance by the standard sealing element in the air sealing industry. The structure is simple in design and safe and reliable in sealing.
Although the present invention has been described above in connection with the exemplary embodiments and the accompanying drawings, it will be apparent to those of ordinary skill in the art that various modifications may be made to the above-described embodiments without departing from the spirit and scope of the claims.
Claims (12)
1. A combined type setting back pressure valve device is characterized by comprising a shell component, a setting component and a back pressure valve component, wherein,
the housing assembly includes a housing;
the setting assembly comprises a self-sealing pipe, an inner sleeve and a locking mechanism; the self-sealing pipe is arranged in the shell in a penetrating way, and a gap for fluid to pass through is formed between the self-sealing pipe and the shell; the inner sleeve is arranged in the self-sealing pipe in a penetrating way and is fixedly connected with the self-sealing pipe; the side wall of the inner sleeve is provided with a plurality of first side holes which are radially communicated, the side wall of the self-sealing pipe is provided with second side holes which can be in one-to-one correspondence with the first side holes, and the inner cavity of the inner sleeve, the first side holes, the second side holes, the gaps among the self-sealing pipe and the shell are communicated with each other to form a fluid channel; the locking mechanism is arranged between the self-sealing pipe and the inner sleeve; the inner sleeve can move downwards along the self-sealing pipe to cut off the fluid passage and is axially locked by the locking mechanism after being subjected to the axial force exceeding the set threshold value;
the back pressure valve assembly penetrates through the shell and is fixedly connected with the lower end of the inner sleeve, and the back pressure valve assembly can move along the axis of the shell along with the inner sleeve.
2. The composite setting back pressure valve device according to claim 1, wherein the locking mechanism comprises a carrier head, a locking ring and a groove, the locking ring is sleeved outside the inner sleeve, the lower end of the locking ring is abutted with the upper end of the carrier head, the groove is arranged on the outer wall of the inner sleeve and is positioned above the locking ring, the inner sleeve can move downwards relative to the locking ring and can clamp the locking ring into the groove to realize the axial locking of the inner sleeve.
3. The composite setting back pressure valve device as claimed in claim 1, wherein the upper end of the inner wall of the inner sleeve is formed with a tapered step surface capable of fixing the soluble ball thrown into the back pressure valve device at the upper end of the inner sleeve and preventing the soluble ball from moving down along the inner cavity of the inner sleeve.
4. The combined type setting back pressure valve device according to claim 1, wherein the setting assembly further comprises a plurality of starting shear pins, the starting shear pins are simultaneously inserted into the side walls of the self-sealing pipe and the inner sleeve to fixedly connect the self-sealing pipe and the inner sleeve, and the starting shear pins can be sheared after the inner sleeve is subjected to an axial force exceeding a set threshold value.
5. The combined type setting back pressure valve device according to claim 1, wherein the back pressure valve assembly comprises a valve body and a valve core, the upper end of the valve body is fixedly connected with the lower end of the inner sleeve and sleeved outside the valve core, and a valve cavity for fluid to flow is formed between the valve body and the valve core;
the valve core comprises a valve core upper section and a valve core lower section, the valve core upper section is arranged in the inner sleeve in a penetrating mode, the valve core upper section is provided with a blind hole along the axial direction, the side wall of the valve core upper section is provided with a plurality of through third side holes, and the third side holes and the blind hole are communicated with the inner cavity of the inner sleeve.
6. The combined type setting back pressure valve device according to claim 5, wherein the back pressure valve assembly further comprises an elastic member and an elastic member support, the elastic member support is fixedly connected to the lower end of the valve body and sleeved on the lower valve element section, a plurality of liquid passing holes which are communicated up and down are formed in the elastic member support, the elastic member is sleeved on the lower valve element section, the upper end of the elastic member is abutted against the step formed between the upper valve element section and the lower valve element section, and the lower end of the elastic member is abutted against the elastic member support.
7. The combined type setting back pressure valve device according to claim 6, wherein the back pressure valve assembly further comprises a shear ring and a protective sleeve, the shear ring is inserted into the elastic member support and is fixedly connected with the elastic member support, the upper end of the shear ring is abutted against the lower end of the valve core, and the shear ring can fall along the axial direction of the elastic member support after receiving an axial force exceeding a set threshold;
the protective sleeve is fixedly connected with the lower end of the elastic part support, the minimum inner diameter of the protective sleeve is larger than the outer diameter of the shearing ring, and the protective sleeve can receive the falling shearing ring.
8. The combined type setting back pressure valve device of claim 7, wherein the back pressure valve assembly further comprises a plurality of valve core shear pins, the valve core shear pins are simultaneously inserted into the side walls of the elastic member support and the shear ring to fixedly connect the elastic member support and the shear ring, and the valve core shear pins can be sheared after the shear ring receives an axial force exceeding a set threshold.
9. The combined type setting back pressure valve device of claim 1, wherein the housing assembly further comprises an upper joint and a lower joint, the lower end of the upper joint is fixedly connected with the housing and the upper end of the self-sealing pipe, and the upper end of the lower joint is fixedly connected with the lower end of the housing.
10. The combined type setting back pressure valve device according to claim 9, wherein sealing elements are arranged at the joint of the upper joint and the shell, the joint of the lower joint and the shell, the joint of the self-sealing pipe and the shell assembly, the joint of the self-sealing pipe and the inner sleeve, and the joint of the inner sleeve and the valve core.
11. Use of the composite set back pressure valve device of any of claims 1 to 10 in drilling operations.
12. A tool string comprising the composite set back pressure valve apparatus of any of claims 1 to 10.
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| CN202211413016.6A CN115680547A (en) | 2022-11-11 | 2022-11-11 | Combined type setting back pressure valve device, tool pipe string and application thereof |
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| CN202211413016.6A CN115680547A (en) | 2022-11-11 | 2022-11-11 | Combined type setting back pressure valve device, tool pipe string and application thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116084905A (en) * | 2023-03-13 | 2023-05-09 | 大庆市璞庆钻采设备制造有限公司 | Sand blaster for oilfield stratum fracturing |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5479988A (en) * | 1991-11-30 | 1996-01-02 | Robert Patrick Appleton | Mud check valves in drilling apparatus (wells) |
| CN2620081Y (en) * | 2003-05-21 | 2004-06-09 | 刘爱军 | Side through type automatic slurry-irrigation sleeve float coupling |
| RU93113U1 (en) * | 2009-12-09 | 2010-04-20 | Закрытое акционерное общество "ОКБ Зенит" (ЗАО "ОКБ Зенит") | Coupling Cementing |
| CN101881142A (en) * | 2010-07-02 | 2010-11-10 | 中国石油集团川庆钻探工程有限公司井下作业公司 | Self-sealing setting ball seat |
| CN202055797U (en) * | 2011-04-21 | 2011-11-30 | 丹诺(北京)石油技术服务有限公司 | Whole-course self-filling extruding type floating hoop with rubber plug |
| US20120261136A1 (en) * | 2011-04-15 | 2012-10-18 | Halliburton Energy Services, Inc. | Selectively activatable and deactivatable wellbore pressure isolation device |
| CN203626706U (en) * | 2013-12-10 | 2014-06-04 | 中国石油集团西部钻探工程有限公司 | Well control set packing pipe nipple |
| CN204729049U (en) * | 2015-06-10 | 2015-10-28 | 新疆再兴科苑石油科技有限公司 | From grouting floating hoop |
| CN205743829U (en) * | 2016-05-05 | 2016-11-30 | 中国石油集团渤海钻探工程有限公司 | A kind of well cementation bottom plug with back pressure mechanism |
| CN110195574A (en) * | 2018-02-24 | 2019-09-03 | 广汉川油井控装备有限公司 | Cylindrical pressure return valve |
| CN210829183U (en) * | 2019-07-19 | 2020-06-23 | 山东智虹石油科技有限公司 | Constant pressure setting washable check valve |
-
2022
- 2022-11-11 CN CN202211413016.6A patent/CN115680547A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5479988A (en) * | 1991-11-30 | 1996-01-02 | Robert Patrick Appleton | Mud check valves in drilling apparatus (wells) |
| CN2620081Y (en) * | 2003-05-21 | 2004-06-09 | 刘爱军 | Side through type automatic slurry-irrigation sleeve float coupling |
| RU93113U1 (en) * | 2009-12-09 | 2010-04-20 | Закрытое акционерное общество "ОКБ Зенит" (ЗАО "ОКБ Зенит") | Coupling Cementing |
| CN101881142A (en) * | 2010-07-02 | 2010-11-10 | 中国石油集团川庆钻探工程有限公司井下作业公司 | Self-sealing setting ball seat |
| US20120261136A1 (en) * | 2011-04-15 | 2012-10-18 | Halliburton Energy Services, Inc. | Selectively activatable and deactivatable wellbore pressure isolation device |
| CN202055797U (en) * | 2011-04-21 | 2011-11-30 | 丹诺(北京)石油技术服务有限公司 | Whole-course self-filling extruding type floating hoop with rubber plug |
| CN203626706U (en) * | 2013-12-10 | 2014-06-04 | 中国石油集团西部钻探工程有限公司 | Well control set packing pipe nipple |
| CN204729049U (en) * | 2015-06-10 | 2015-10-28 | 新疆再兴科苑石油科技有限公司 | From grouting floating hoop |
| CN205743829U (en) * | 2016-05-05 | 2016-11-30 | 中国石油集团渤海钻探工程有限公司 | A kind of well cementation bottom plug with back pressure mechanism |
| CN110195574A (en) * | 2018-02-24 | 2019-09-03 | 广汉川油井控装备有限公司 | Cylindrical pressure return valve |
| CN210829183U (en) * | 2019-07-19 | 2020-06-23 | 山东智虹石油科技有限公司 | Constant pressure setting washable check valve |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116084905A (en) * | 2023-03-13 | 2023-05-09 | 大庆市璞庆钻采设备制造有限公司 | Sand blaster for oilfield stratum fracturing |
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