Reverse pressure building reset grabbing tool
By designing a reverse pressure-holding and resetting grabbing tool, the problem of low construction efficiency when reservoir thickness varies greatly is solved, efficient fracturing operations are achieved in any reservoir thickness, construction steps are simplified, and risks are reduced.
Patent Information
- Application Number
- CN202423260209.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-10-24
- Estimated Expiration
- 2034-12-27
AI Technical Summary
The existing fracturing string cannot adapt to multi-layer fracturing operations in a single string with large differences in reservoir thickness. Frequent adjustment of the distance between the bottom drag packer and the sandblaster is required, resulting in low construction efficiency.
A reverse pressure-holding and resetting grabbing tool is designed, which includes a grabbing tool and a docking sleeve. Through an elastic locking component and a sealing ring structure, the tool can be grabbed and released in any reservoir thickness, adapting to fracturing operations of any reservoir thickness.
It improves construction efficiency, reduces the need to repeatedly bring out the fracturing string, simplifies construction operations, and reduces construction risks.
Smart Images
Figure CN223469242U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to oil and gas development mining fracturing operation field, specifically, relates to a reverse pressure reset grabbing tool. BACKGROUND
[0002] One pipe string multilayer fracturing is a common production increasing means in unconventional oil and gas field development at home and abroad, and the pipe string composition used in fracturing operation is usually "bottom drag packer + sandblaster + top packer" from bottom to top, and the operation mode is as follows: the fracturing pipe string is lowered to the design depth of the first target layer, the bottom drag packer is set, the top packer is set, then the fracturing fluid and proppant are squeezed into the formation through the oil pipe and the sandblaster to the design pressure to complete the fracturing of the layer; the fracturing pipe string is lifted, the top packer is released, the bottom drag packer is released, then the fracturing pipe string is continuously lifted to the design depth of the second target layer, the bottom drag packer is set, the top packer is set, then the fracturing fluid and proppant are injected into the formation through the oil pipe and the sandblaster to the design pressure to complete the fracturing of the second layer; then the multilayer fracturing is sequentially implemented layer by layer.
[0003] The distance between the bottom drag packer and the sandblaster and the top packer in the above-mentioned fracturing pipe string is fixed, which is more suitable for the fracturing of multiple reservoirs with relatively uniform reservoir thickness, but once the reservoir thickness difference is large, the fracturing pipe string can only be lifted, the pipe is reconfigured, the distance between the bottom drag packer and the sandblaster and the top packer is adjusted, and then the fracturing pipe string is lowered to continue the fracturing operation of the next layer. Therefore, it is necessary to design a reverse pressure reset grabbing tool which can be lifted to any designed position with the fracturing pipe string to adapt to any reservoir thickness. CONTENT OF THE UTILITY MODEL
[0004] The utility model aims at solving at least one of the above-mentioned deficiencies in the prior art. For example, one of the purposes of the utility model is to provide a reverse pressure reset grabbing tool which can adapt to any reservoir thickness.
[0005] In order to achieve the above-mentioned purpose, the utility model provides a reverse pressure reset grabbing tool on one aspect, the tool can include a grabbing tool and a butt joint cylinder, wherein the grabbing tool can include an upper joint, an upper mandrel, a central pipe and a sealing ring which are connected in sequence; a pressure cap, a cylinder sleeve and an elastic locking assembly can be sequentially arranged on the upper mandrel; the upper mandrel, the pressure cap and the cylinder sleeve form a cavity, and a locking ring located on the upper mandrel can be arranged in the cavity; a pressure transmission hole can be arranged on the upper mandrel; the cylinder sleeve can drive the pressure cap, the locking ring and the elastic locking assembly to move axially; a first recess and a first boss can be arranged on the central pipe; the elastic locking assembly is in a retracted state when one end of the elastic locking assembly reaches the first recess, and is in an open state when the one end reaches the first boss; the sealing ring is connected with the butt joint cylinder; a second recess can be arranged in the inner cavity of the body of the butt joint cylinder, and the elastic locking assembly is in a retracted state when one end of the elastic locking assembly reaches the second recess.
[0006] According to an exemplary embodiment of one aspect of the present application, the elastic locking assembly can include a spring and an elastic slip arranged in sequence, and the spring is located between the cylinder sleeve and the elastic slip.
[0007] According to an exemplary embodiment of one aspect of the present application, the elastic locking assembly can further include a spring sheath, the spring sheath is connected with the cylinder sleeve, the spring is located in the spring sheath, and one end of the elastic slip is located in the spring sheath.
[0008] According to an exemplary embodiment of one aspect of the present application, the structure of the elastic slip can include a multi-petal elastic claw.
[0009] According to an exemplary embodiment of one aspect of the present application, the outer surface of the upper mandrel can be provided with a sawtooth thread, the inner surface of the lock ring can be provided with a sawtooth thread, and the two sawtooth threads are engaged.
[0010] According to an exemplary embodiment of one aspect of the present application, the lock ring can include an open lock ring.
[0011] According to an exemplary embodiment of one aspect of the present application, one end of the body inner cavity of the butt joint cylinder can be provided with a valve seat, a ball valve can be arranged inside the valve seat, and a valve cover can be arranged between the valve seat and the body inner cavity.
[0012] According to an exemplary embodiment of one aspect of the present application, a plurality of through holes can be arranged on the body inner cavity of the butt joint cylinder.
[0013] According to an exemplary embodiment of one aspect of the present application, a throttling seat can be arranged in the inner cavity of the upper mandrel.
[0014] According to an exemplary embodiment of one aspect of the present application, a bushing can be arranged in the inner cavity of the upper mandrel.
[0015] Compared with the prior art, the present application has the following beneficial effects:
[0016] (1) The grabbing tool provided by the present application can adapt to the thickness of the reservoir for operation, is convenient to operate, and improves the construction efficiency;
[0017] (2) The grabbing tool provided by the present application has six through holes on the body between the groove and the sealing surface, which facilitates the circulation flushing of the inner and outer cavities of the tool, and is simple to maintain. BRIEF DESCRIPTION OF DRAWINGS
[0018] The above and other objects and / or characteristics of the present application will become more apparent from the following description made with reference to the accompanying drawings, in which:
[0019] Figure 1 The utility model discloses a structure diagram of the grabbing tool shows.
[0020] Figure 2 The utility model discloses a structure diagram of the butt joint cylinder shows.
[0021] Figure 3a The utility model discloses a side view of the lock ring shows.
[0022] Figure 3b The utility model discloses a front view of the lock ring shows.
[0023] Figure 4 The utility model discloses a structure diagram of the lock ring and the upper mandrel engagement shows.
[0024] Main figure mark explanation:
[0025] 1 - upper joint, 2 - upper mandrel, 3 - press cap, 4 - lock ring, 5 - throttle seat, 6 - cylinder sleeve, 7 - bush, 8 - spring sheath, 9 - spring, 10 - central tube, 101 - first recess, 102 - first boss, 11 - elastic slipper, 111 - second boss, 12 - sealing ring, 13 - butt joint cylinder body, 131 - through hole, 14 - valve cover, 15 - ball valve, 16 - valve seat, 17 - second recess. DETAILED DESCRIPTION
[0026] In the following, will combine exemplary embodiment to explain the utility model in detail one kind reverse pressure reset grabbing tool.
[0027] In the description of the present application, it is understood that the orientation or position relationship indicated by the terms "in", "out", "middle" etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application. The terms "first", "second", etc. are only for the convenience of description and easy to distinguish, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" etc. can be explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of", "several" is two or two or more.
[0028] In the description of this application, it should be noted that, unless otherwise specified or limited, the term "connection" should be understood in a broad sense. For example, it can mean a fixed connection, a detachable connection, or an integral connection; it can mean a direct connection, an indirect connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.
[0029] First Exemplary Embodiment
[0030] The present exemplary embodiment provides a reverse pressure-holding and resetting grasping tool.
[0031] Figure 1 Shows a schematic structural diagram of a grabbing tool of the present utility model; Figure 2 Shows a structural schematic diagram of the docking sleeve of the present utility model; Figure 3a Shows a side view of the lock ring of the present invention; Figure 3b Shows a front view of the lock ring of the present invention; Figure 4 The figure shows the engagement structure diagram of the lock ring and the upper core shaft of the utility model. It should be noted that the direction from top to bottom in the specification is Figure 1 and 2 From left to right direction. Figures 1 to 4 The reverse pressure holding and resetting grasping tool of this exemplary embodiment will be described.
[0032] In this exemplary embodiment, the reverse pressure holding and resetting grasping tool mainly includes a grasping tool and a docking sleeve, wherein, as Figure 1 As shown, the grasping tool may include an upper joint 1, an upper core shaft 2, a center tube 10 and a sealing ring 12 which are threadedly connected in sequence; the upper core shaft 2 may be provided with a pressure cap 3, a cylinder sleeve 6 and an elastic locking assembly in sequence, the pressure cap 3 may be threadedly connected to the cylinder sleeve 6, and the cylinder sleeve 6 may be threadedly connected to the elastic locking assembly; the upper core shaft 2, the pressure cap 3 and the cylinder sleeve 6 form a cavity, and a locking ring 4 located on the upper core shaft 2 may be provided in the cavity. After the grasping tool is connected to the docking sleeve, the elastic slip 11 may be separated from the limit of the sealing ring 12 under the action of a slight external force. The provision of the locking ring 4 can prevent the docking sleeve from accidentally falling off.
[0033] A pressure transmission hole may be provided on the upper core shaft 2. Here, there are two sealing surfaces of different sizes in the inner cavity of the cylinder sleeve 6. Two sealing surfaces of different sizes are also provided on the outside of the upper core shaft 2, and cooperate with the two sealing surfaces of different sizes in the inner cavity of the cylinder sleeve 6. The pressure transmission hole is provided between the large and small sealing surfaces. The two sealing surfaces of different sizes in the inner cavity of the cylinder sleeve 6 and the two sealing surfaces of different sizes on the upper core shaft 2 together with the pressure transmission hole form a piston. When the piston is subjected to a certain value of liquid pressure, the cylinder sleeve 6 can move axially along the upper core shaft 2; the cylinder sleeve 6 can drive the pressure cap 3, the lock ring 4 and the elastic locking assembly to move axially.
[0034] The first groove 101 and the first boss 102 can be arranged on the central tube 10. When the elastic locking assembly is arranged at the first groove 101, the elastic locking assembly is in the retracted state, and when the elastic locking assembly is arranged at the first boss 102, the elastic locking assembly is in the expanded state. The sealing ring 12 can be arranged with a screw thread at one end to connect with the central tube 10, and can be arranged with a sealing surface at the other end to connect with the adapter sleeve. The second groove 17 can be arranged in the inner cavity of the body of the adapter sleeve. When the elastic locking assembly is arranged at the second groove 17, the elastic locking assembly is in the retracted state.
[0035] In the present exemplary embodiment, as shown in Figure 1 , the elastic locking assembly can include the elastic slips 11 and the spring 9. The elastic slips 11 are sleeved on the central tube 10, and are spaced apart from the cylinder sleeve 6 in the axial direction. The spring 9 is arranged between the elastic slips 11 and the cylinder sleeve 6. The cylinder sleeve 6 can compress the spring 9 to push the elastic slips 11 to move axially on the central tube 10.
[0036] In the present exemplary embodiment, as shown in Figure 1 , the spring 9 can be sleeved with the spring sheath 8. One end of the spring sheath 8 can be connected with the cylinder sleeve 6 by a screw thread, and the other end of the spring sheath 8 can be connected with the elastic slips 11 by a screw thread. The cylinder sleeve 6, the elastic slips 11, and the spring sheath 8 form a cavity, and the spring 9 can be sleeved in the cavity. When the elastic slips 11 are subjected to an axial force reaching a certain value, the elastic slips 11 can overcome the elastic force of the spring 9 and move axially along the central tube 10.
[0037] In the present exemplary embodiment, as shown in Figure 1 , the elastic slips 11 can include multi-limb elastic claws. The second boss 111 is a protruding part at the front end of the elastic claw. When the second boss 111 is subjected to a force, the multi-limb elastic claws are expanded. When the second boss 111 is unlocked, the multi-limb elastic claws can be retracted, which is convenient for storage and release, and is conducive to the progress of the construction process.
[0038] In the present exemplary embodiment, as shown in Figure 4 , the locking ring 4 fixed on one side of the upper mandrel 2 can be provided with a sawtooth thread. The locking ring 4 fixed on one side of the upper mandrel 2 can also be provided with a sawtooth thread. The sawtooth threads of the two are engaged with each other. When the locking ring 4 is subjected to an axial force reaching a certain value, the locking ring 4 can move axially along the upper mandrel.
[0039] In the present exemplary embodiment, as shown in Figure 3a or 3b, the locking ring can include an open locking ring.
[0040] In the present exemplary embodiment, as shown in Figure 2As shown in the drawings, one end of the inner cavity of the docking barrel body 13 can be provided with a valve seat 16, the inside of the valve seat 16 can be provided with a ball valve 15, and the valve seat 16 and the inner cavity of the docking barrel body 13 can be provided with a valve cover 14. The ball valve 15, the valve cover 14 and the valve seat 16 form a dead chamber in the docking barrel, and the internal pressure test of the grabbing tool can be successful, otherwise the lower end of the docking barrel is unobstructed, and hydraulic pressure cannot be generated to push the cylinder sleeve.
[0041] In the present exemplary embodiment, as shown in the drawings, Figure 2 As shown in the drawings, the end of the inner cavity of the docking barrel body 13 connected with the sealing ring can be provided with a smooth sealing surface matched with the sealing surface of the sealing ring. The body of the docking barrel body 13 between the second groove and the smooth sealing surface can be provided with a plurality of through holes 131, for example, 4-8, for example, 5, 6 or 7. The through holes 131 are connected with the outside of the docking barrel, which facilitates the circulation flushing of the inner and outer cavities of the tool.
[0042] In the present exemplary embodiment, as shown in the drawings, Figure 1 As shown in the drawings, the inner cavity of the upper core shaft 2 can be provided with a throttling seat 5 to form a throttling pressure difference.
[0043] In the present exemplary embodiment, as shown in the drawings, Figure 1 As shown in the drawings, the inner cavity of the upper core shaft 2 can be provided with a bushing 7 to increase the corrosion resistance of the grabbing tool. The bushing 7 can be arranged below the throttling seat 5.
[0044] The construction method of the reverse pressure relief reset grabbing tool of the present application can include dividing the tool into a grabbing hand tool and a docking barrel, and the grabbing tool can be connected with a sand blaster; the docking barrel can be connected with a bottom packer. The position of the docking barrel connected with the bottom packer does not change, and the grabbing tool connected with the sand blaster can be pulled up to any designed position after being separated from the docking barrel along with the fracturing pipe column, thereby adapting to any reservoir thickness. Specifically, if the grabbing tool and the docking barrel need to be connected with each other, the following steps can be included:
[0045] 1) The grabbing tool presses down the docking barrel.
[0046] 2) The elastic slips are compressed by the pressure of the docking barrel, the spring is compressed, and the elastic slips move upward, and when the second boss of the elastic slips is in the position of the first groove of the central pipe, the second boss of the elastic slips is retracted.
[0047] 3) The first boss of the elastic slips enters the second groove of the docking barrel body, the second boss is retracted, and the elastic slips lose the pressure of the docking barrel.
[0048] 4) The spring pushes the elastic slips to move downward.
[0049] 5) When the second protrusion of the elastic slip is in the first protrusion position of the central pipe, the second protrusion of the elastic slip is expanded, and when the central pipe has entered the butt cylinder, the mutual butt joint can be achieved as long as the second protrusion of the elastic slip is expanded.
[0050] If the grabbing tool needs to be detached from the butt cylinder, the following steps can be included:
[0051] 1) Hydraulic pressure is applied to the inner cavity of the grabbing tool.
[0052] 2) The pressure transmission hole on the upper mandrel body transmits the hydraulic pressure to the cylinder sleeve.
[0053] 3) The cylinder sleeve is moved downward under the action of the hydraulic pressure, and the lock ring and the elastic slip are synchronously moved downward.
[0054] 4) When the second protrusion of the elastic slip is in the first groove position of the central pipe, the first protrusion of the elastic slip is retracted and unlocked.
[0055] 5) The inner cavity of the grabbing tool is depressurized.
[0056] 6) The lock ring remains in the state of holding the upper mandrel, and the elastic slip remains in the state of being retracted and unlocked.
[0057] 7) The grabbing tool is lifted, and the grabbing tool can be detached from the butt cylinder.
[0058] After the grabbing tool is detached from the butt cylinder, the following steps can be included for butt joint:
[0059] 1) The grabbing tool is pressed downward on the butt cylinder.
[0060] 2) The sealing surface on the sealing ring is matched and sealed with the sealing surface of the butt cylinder body.
[0061] 3) Hydraulic pressure is applied to the outside of the grabbing tool.
[0062] 4) The cylinder sleeve is moved downward under the action of the hydraulic pressure, and the lock ring and the elastic slip are synchronously moved downward.
[0063] 5) When the second protrusion of the elastic slip is in the first protrusion position of the central pipe, the second protrusion of the elastic slip is expanded. At this time, the grabbing tool again holds the butt cylinder.
[0064] In summary, the advantages of the utility model can include at least one of the following contents:
[0065] (1) The grabbing tool provided by the utility model does not need to be pulled out multiple times, and the next well can fracture multiple layers of reservoirs with any thickness.
[0066] (2) The grabbing tool provided by the utility model has simple grabbing and detaching steps, is easy to operate, and has small construction risk.
[0067] While the reverse pressure build-up reset gripping tool of the present application has been described above by incorporating the exemplary embodiments, it should be apparent to those having ordinary skill in the art that a number of changes, modifications or alterations to the exemplary embodiments can be made while remaining within the spirit and scope of the claims.
Claims
1. A reverse pressure-pulse reset gripper characterized by, The tool comprises a grabbing tool and a docking cylinder, wherein, The grabbing tool comprises an upper joint, an upper mandrel, a central pipe and a sealing ring connected in sequence; the upper mandrel is provided with a pressing cap, a cylinder sleeve and an elastic locking assembly in sequence; the upper mandrel, the pressing cap and the cylinder sleeve form a cavity, and the cavity is provided with a locking ring located on the upper mandrel; the upper mandrel is provided with a pressure transmission hole; the cylinder sleeve can drive the pressing cap, the locking ring and the elastic locking assembly to move axially; the central pipe is provided with a first recess and a first boss; the elastic locking assembly is in a retracted state when one end of the elastic locking assembly reaches the first recess, and is in an expanded state when the one end of the elastic locking assembly reaches the first boss; the sealing ring is connected with the docking cylinder; the inner cavity of the body of the docking cylinder is provided with a second recess, and the elastic locking assembly is in a retracted state when one end of the elastic locking assembly reaches the second recess.
2. The reverse blow reset grab tool of claim 1, wherein, The elastic locking assembly comprises a spring and an elastic slipper arranged in sequence, and the spring is located between the cylinder sleeve and the elastic slipper.
3. The reverse blow reset grab tool of claim 2, wherein, The elastic locking assembly further comprises a spring sheath, the spring sheath is connected with the cylinder sleeve, the spring is located in the spring sheath, and one end of the elastic slipper is located in the spring sheath.
4. The reverse blow reset grab tool of claim 2, wherein, The elastic slipper comprises a multi-petal elastic claw.
5. The reverse blow reset grab tool of claim 1, wherein, The outer surface of the upper mandrel is provided with a sawtooth thread, and the inner surface of the locking ring is provided with a sawtooth thread, and the sawtooth threads of the two are engaged.
6. The reverse blow reset grab tool of claim 1, wherein, The locking ring comprises an open locking ring.
7. The reverse blow reset grab tool of claim 1, wherein, One end of the inner cavity of the body of the docking cylinder is provided with a valve seat, the inner part of the valve seat is provided with a ball valve, and the valve seat and the inner cavity of the body are provided with a valve cover.
8. The reverse blow reset grab tool of claim 1, wherein, A plurality of through holes are formed on the inner cavity of the body of the docking cylinder.
9. The reverse blow reset grab tool of claim 1, wherein, A throttling seat is arranged in the inner cavity of the upper mandrel.
10. The reverse blow reset grab tool of claim 1, wherein, A bushing is arranged in the inner cavity of the upper mandrel.