Sitting key pulse device

Abstract

The invention provides a key setting pulse device which comprises a key setting barrel, a key channel formed in the key setting barrel and a key which is connected with a downhole instrument and extends to penetrate through the key channel, a fishing head used for being connected with a fishing tool in a clamped mode is arranged at the top end of the key, and the fishing head is connected with the downhole instrument in a clamped mode. The key setting pulse device further comprises a plurality of slurry circulating channels which penetrate through the key setting barrel and allow slurry to pass through, and the fishing head is constructed to be capable of driving the key setting barrel to synchronously move upwards under the action of the fishing tool, so that the slurry is allowed to move downwards through the slurry circulating channels.

Description

Technical Field

[0001] This invention relates to the field of measurement while drilling, and more specifically to a keyway pulse device. Background Technology

[0002] Currently, measurement while drilling (MWD) systems are the most commonly used downhole tools in oil drilling, and pulse transmitters are a crucial component of MWD systems. Due to the complex downhole environment, pulse transmitters may experience signal loss or instrument malfunction, necessitating tripping out of the well for replacement or repair. This involves retrieving the drill pipe until the pulse transmitter is retrieved, and then performing replacement or repair. This process is labor-intensive, inefficient, and consumes a significant amount of production time.

[0003] CN2744827 discloses a downhole retrieval tool used in oilfield well workover operations. The device consists of an upper connector, a spear shaft, a locking mechanism, slips, a locking block, fixing screws, and connecting screws. Because the spear shaft has a locking groove and the slips are connected to a locking mechanism, under downward impact, the locking arm on the locking mechanism can engage in the locking groove, thereby securing the slips and detaching them from the inner wall of the fallen object. This device can only retrieve instruments and is typically used when drilling accidents occur; it cannot meet the requirements for retrieval operations without shutting down the well.

[0004] Therefore, it is desirable in the art to provide a key pulse device that can perform retrieval and replacement work without stopping the well, thereby effectively saving time and production costs, and further avoiding problems such as inability to retrieve or lack of signal due to instrument damage. Summary of the Invention

[0005] The purpose of this invention is to provide a keyway pulse device that can retrieve the keyway cylinder using a retrieval tool without stopping the well, thereby overcoming the drawbacks of existing technologies that require stopping drilling for retrieval or cannot be reused.

[0006] According to a first aspect of the present invention, a keying pulse device is provided, comprising a keying cylinder, a key channel formed within the keying cylinder, and a key connected to a downhole instrument and extending through the key channel.

[0007] The key has a retrieval head at its top for engaging with a retrieval tool. The key pulse device also includes multiple mud circulation channels that penetrate the key cylinder and allow mud to pass through.

[0008] The retrieval head is configured to drive the keyway cylinder upward synchronously under the action of the retrieval tool, thereby allowing the mud to flow downward through the mud circulation channel.

[0009] In one embodiment, the key pulse device further includes a guide ring disposed on the upper end face of the key cylinder, and a through groove is formed in the middle of the guide ring for limiting the movement path of the key.

[0010] In one embodiment, the guide ring is further provided with a plurality of guide holes arranged around the through groove and allowing mud to enter, the guide holes being axially aligned with the mud circulation channel.

[0011] In one embodiment, the flow guide hole is constructed as either a circular hole or a square hole.

[0012] In one embodiment, the retrieval head includes a guide portion configured in a conical structure and a retrieval portion configured in a columnar structure disposed below the guide portion.

[0013] In one embodiment, a wear-resistant layer is provided on the outer wall of both the guide portion and the retrieval portion, and the wear-resistant layer is constructed as a metal oxide plasma coating.

[0014] In one embodiment, the key is configured as a stepped column structure and includes a first column and a second column for abutting against the flow guide ring, wherein the diameter of the first column is smaller than that of the second column.

[0015] In one embodiment, a positioning seat for limiting the movement path of the salvage tool is fitted onto the first column.

[0016] In one embodiment, the keyway pulse device further includes a first sealing part fixed to the lower end face of the guide ring and used to abut against the second column, and a second sealing part concentrically arranged in the annular space between the keyway cylinder and the second column, wherein the lower end face of the second sealing part is flush with the lower end face of the keyway cylinder.

[0017] In one embodiment, a positioning element made of magnetic material is provided inside the retrieval head.

[0018] The salvage tool includes a salvage claw, an electromagnet disposed within the salvage claw and adapted to the positioning body, and a motor connected to the salvage claw, wherein the positioning body can be attracted by the electromagnet after the salvage claw is energized.

[0019] Compared with the prior art, the advantages of the present invention are as follows:

[0020] Firstly, this invention enables the retrieval of the keyway using a retrieval tool without shutting down the well, thus overcoming the drawbacks of existing technologies that require stopping drilling for retrieval or cannot be reused for secondary operations. Preferably, when the keyway moves upward under the pulling action of the retrieval tool, the mud can flow from top to bottom through the guide hole and mud circulation channel in sequence. Therefore, the mud can still circulate in the well while the keyway is moving upward, further ensuring that this device can perform retrieval operations without shutting down the well.

[0021] Secondly, this invention effectively solves the problem of instruments becoming unresponsive and unable to continue measurement due to excessive well deviation or excessive drilling speed caused by excessively high drilling inclination or drilling speed. Furthermore, since the keyed pulse device and the suspension sub are assembled as a kit, it has the advantages of easy disassembly, assembly, and retrieval, simplifying the overall design and shortening the manufacturing cycle, thus facilitating retrieval operations. Attached Figure Description

[0022] The invention will now be described in detail with reference to the accompanying drawings, in which:

[0023] Figure 1 The schematic diagram illustrates the structure of the key pulse device according to the present invention;

[0024] Figure 2 for Figure 1 Top view;

[0025] Figure 3 The schematic diagram illustrates the upward state of the key pulse device according to the present invention.

[0026] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not drawn to scale. Detailed Implementation

[0027] To make the technical solutions and advantages of the present invention clearer, exemplary embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not an exhaustive list of all embodiments. Furthermore, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0028] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0029] In this invention, unless otherwise explicitly specified and limited, the terms "installation", "connection", "linking", "fixing", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components.

[0030] Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0031] The invention will now be further described with reference to the accompanying drawings.

[0032] Figure 1 The schematic diagram illustrates the structure of the key pulse device according to the present invention;

[0033] Figure 2 for Figure 1 Top view;

[0034] Figure 3 The schematic diagram illustrates the upward state of the key pulse device according to the present invention.

[0035] like Figure 1 and 3 As shown, according to a first aspect of the present invention, a keying pulse device is provided, comprising a keying cylinder 11 and a key. Preferably, the downstream end of the key is connected to a downhole instrument 200, and the upstream end of the key extends through the keying cylinder 11. In this invention, a retrieval head 12 is also provided at the upstream end of the key.

[0036] Preferably, after the retrieval tool is lowered, it can engage with the retrieval head 12, allowing the entire keyway cylinder 11 to be lifted out through the retrieval head 12 without stopping the well, which helps to complete the replacement of the keyway pulse device and further saves time and production costs, as described below.

[0037] In one embodiment of the present invention, such as Figure 1 and 3 As shown, the keyway pulse device also includes multiple mud circulation channels 112 penetrating the keyway cylinder 11. Preferably, when the keyway cylinder 11 moves upward under the pulling action of the fishing tool, the mud can flow from top to bottom through the mud circulation channels 112, so that the mud can still circulate in the well when the keyway pulse device moves upward, thereby further ensuring that the device can carry out fishing operations without stopping the well.

[0038] In this invention, the retrieval head 12 can form a firm locking relationship with the retrieval tool and can drive the seat key cylinder 11 to move upward together. At the same time, the mud will also smoothly move downward through the mud circulation channel 112 to further ensure that the mud can be continuously circulated.

[0039] According to the present invention, such as Figures 1-3 As shown, the key pulse device also includes a guide ring 13 disposed on the upper end face of the key cylinder 11. Preferably, the guide ring 13 is detachably connected to the key cylinder 11, so that the key cylinder 11, the key and the retrieval tool can be more easily coordinated during the retrieval process to ensure that the retrieval work can be carried out smoothly.

[0040] In one embodiment, such as Figures 1-3 As shown, a through groove 131 for limiting the movement path of the key is formed in the middle of the guide ring 13. In this invention, the key is constructed as a stepped column structure, and includes a first column 21 with a smaller diameter and a second column 22 with a larger diameter.

[0041] Preferably, the outer peripheral surface of the first column 21 forms a sealed connection with the inner peripheral surface of the through groove 131, so that during the salvage process, the mud can only flow down through the guide hole 132 (described below) and the mud circulation channel 112 in sequence.

[0042] Preferably, the second column 22 and the key channel 111 are in clearance fit, and the outer diameter of the second column 22 is larger than the diameter of the through groove 131. Therefore, during the retrieval process, the second column 22 will axially abut against the guide ring 13, thereby enabling the key and the key seat cylinder 11 to move upward synchronously under the pulling action of the retrieval tool, so as to smoothly remove the key seat pulse device and facilitate subsequent replacement work.

[0043] In one embodiment, such as Figures 1-3 As shown, the guide ring 13 is also provided with a plurality of guide holes 132 for allowing mud to enter. Preferably, the plurality of guide holes 132 are arranged around the through groove 131, and the number of guide holes 132 is not less than the number of mud circulation channels 112. It is worth noting that each mud circulation channel 112 is aligned with a guide hole 132 in the axial direction to form a channel that allows mud to move from top to bottom, thereby ensuring that the mud can still circulate continuously during the salvage process.

[0044] In one embodiment of the invention, the guide hole 132 is constructed as either a circular hole or a square hole. This effectively increases the mud flow rate, thereby reducing obstruction during the upward movement of the keyway pulse device and further improving the success rate of keyway pulse device replacement.

[0045] However, in other embodiments of the invention, the flow guide hole 132 may also be constructed in other shapes.

[0046] In one embodiment of the present invention, such as Figure 1 and 3 As shown, a positioning seat 14 for restricting the movement path of the retrieval tool is sleeved on the first column 21. Preferably, due to the complex downhole environment, it is usually impossible to directly and accurately determine whether the engagement is successful after the retrieval tool contacts the retrieval head 12, which undoubtedly increases the likelihood of retrieval failure.

[0047] This application provides a positioning seat 14 on the first column 21, allowing the retrieval tool to extend downwards until it axially contacts the positioning seat 14. Upon retraction, it can smoothly engage with the retrieval head 12. This method helps determine the engagement status of the retrieval tool and the retrieval head 12, thereby improving the success rate of the retrieval key pulse device and further overcoming various problems caused by the complex environment of downhole operations.

[0048] In addition, since the downstream end of the key is connected to the downhole instrument 200, the axial contact between the positioning seat 14 and the key cylinder 11 can effectively limit the downward distance of the key, which is helpful for subsequent retrieval work.

[0049] In one embodiment, such as Figure 1 and 3 As shown, the retrieval head 12 includes a guide portion 121 configured as a cone shape, and a retrieval portion 122 configured as a columnar shape, disposed between the guide portion 121 and the first column 21. Preferably, the cross-sectional area of ​​the guide portion 121 gradually increases towards the retrieval portion 122, and the maximum cross-sectional area of ​​the guide portion 121 is equal to the cross-sectional area of ​​the retrieval portion 122. It is easy to understand that during the retrieval process, the retrieval tool can first expand outward through the guide portion 121, and then form a locking contact with the lower end face of the retrieval portion 122 when it passes over the retrieval portion 122.

[0050] In one embodiment of the present invention, a wear-resistant layer is provided on the outer walls of both the guide portion 121 and the retrieval portion 122. Preferably, the wear-resistant layer is a metal oxide plasma coating. Therefore, during the retrieval process, not only can slippage or drop when the retrieval tool contacts the retrieval head 12 be avoided, but also wear caused by collision between the retrieval tool and the retrieval head 12 can be prevented, thereby effectively ensuring the safety of the key pulse device and the stability of the retrieval process.

[0051] In one embodiment, such as Figure 1 and 3As shown, the key pulse device also includes a first sealing part 15. Preferably, the first sealing part 15 is fixed at the lower end face of the guide ring 13 and can axially abut against the second column 22 during retrieval, thereby achieving a good sealing effect. Preferably, the first sealing part 15 is constructed in a ring shape and sleeved on the outside of the first column 21.

[0052] In one embodiment, such as Figure 1 and 3 As shown, the keyway pulse device further includes a second sealing part 16 disposed below the first sealing part 15. Preferably, the second sealing part 16 is configured in an annular structure and concentrically arranged in the annular space between the keyway cylinder 11 and the second column 22, thereby providing a certain degree of straightening effect on the second column 22.

[0053] Preferably, the second sealing part 16 consists of at least two sealing rings arranged in abutment or spaced apart from each other, and the lower end face of the lowermost sealing ring is flush with the lower end face of the keyway cylinder 11.

[0054] Preferably, a suspension sub 30 is also provided outside the keyway pulse device. In other words, the keyway pulse device and the suspension sub 30 are assembled into a kit and fixed inside the drill collar, which facilitates subsequent salvage operations.

[0055] It is worth noting that the present invention effectively solves the problem of the inability to continue measurement caused by the instrument unfastening due to excessive well inclination or excessive drilling speed by using an upper-suspended structure (i.e., installed above the downhole instrument 200).

[0056] Due to the complex downhole environment, retrieval failures are prone to occur due to misalignment or deviation between the retrieval device and the retrieval head. To better ensure successful retrieval on the first attempt and reduce costs, this invention employs magnetic positioning retrieval technology, as detailed below:

[0057] A positioning element is provided inside the retrieval head 12. Preferably, the positioning element occupies one-third of the retrieval head 12 and is made of magnetic material. In this invention, the retrieval tool includes a retrieval claw, an electromagnet disposed inside the retrieval claw and adapted to the positioning element, and a motor connected to the retrieval claw. Therefore, after the retrieval claw is energized, the positioning element can be more easily attracted by the electromagnet, thereby further improving retrieval efficiency and success rate.

[0058] In other words, when the salvage tool moves downward and performs salvage, the electromagnet inside the salvage claw is energized by the motor, which can effectively attract the positioning body inside the salvage head 12, so as to make the salvage claw and the salvage head 12 in the same axis, and further prevent the salvage position from deviating or becoming detached.

[0059] Compared with existing technologies, the present invention has the following advantages:

[0060] Firstly, this invention enables the retrieval of the keyway cylinder 11 using a retrieval tool without stopping the well, thus overcoming the drawbacks of existing technologies that require stopping drilling for retrieval or cannot be reused. Preferably, when the keyway cylinder 11 moves upward under the pulling action of the retrieval tool, the mud can flow from top to bottom through the guide hole 132 and the mud circulation channel 112 in sequence. Therefore, the mud can still circulate in the well while the keyway cylinder 11 is moving upward, further ensuring that this device can perform retrieval work without stopping the well.

[0061] Secondly, this invention effectively solves the problem of measurement failure caused by excessive well inclination or excessive drilling speed leading to instrument uncoupling. Furthermore, since the keyway pulse device and suspension sub 30 are assembled into a kit, they are easy to disassemble and retrieve, simplifying the overall design, shortening the manufacturing cycle, and facilitating retrieval operations.

[0062] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art can easily make changes or modifications within the scope of the present invention, and such changes or modifications should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A setting key pulsing device, comprising a setting key barrel (11), a key channel (111) formed in the setting key barrel (11), and a key connected with a downhole instrument (200) and extending through the key channel (111), wherein a fish head (12) is arranged at the top end of the key for being clamped with a fishing tool, the setting key pulsing device further comprises a plurality of mud circulation channels (112) penetrating the setting key barrel (11) and allowing mud to pass through, the fish head (12) is configured to drive the setting key barrel (11) to ascend synchronously under the action of the fishing tool, thereby allowing the mud to pass through the mud circulation channels (112) to descend.

2. The sit-key pulsing device of claim 1, wherein, The setting key pulsing device further comprises a flow guide ring (13) arranged on the upper end surface of the setting key barrel (11), and a through slot (131) is formed in the middle of the flow guide ring (13) for limiting the movement path of the key.

3. The sit-key pulsing device of claim 2, wherein, A plurality of flow guide holes (132) are arranged around the through slot (131) on the flow guide ring (13) and allow mud to enter, and the flow guide holes (132) are axially aligned with the mud circulation channels (112).

4. The sit-key pulsing device of claim 3, wherein, The flow guide holes (132) are configured as any one of a circular hole and a square hole.

5. The sit-key pulsing device of any one of claims 2 to 4, wherein, The fish head (12) comprises a guide portion (121) configured as a conical structure, and a fish portion (122) configured as a columnar structure arranged below the guide portion (121).

6. The sit-key pulsing device of claim 5, wherein, A wear-resistant layer is arranged on the outer wall of the guide portion (121) and the fish portion (122), and the wear-resistant layer is configured as an oxidized metal plasma coating.

7. The sit-key pulsing device of any one of claims 2 to 4, wherein, The key is configured as a stepped column structure and comprises a first column (21) and a second column (22) for abutting against the flow guide ring (13), wherein the diameter of the first column (21) is smaller than that of the second column (22).

8. The sit-key pulsing device of claim 7, wherein, A positioning seat (14) for limiting the movement path of the fishing tool is arranged on the first column (21).

9. The sit-key pulsing device of claim 8, wherein, The setting key pulsing device further comprises a first sealing portion fixed on the lower end surface of the flow guide ring (13) and used for abutting against the second column (22), and a second sealing portion concentrically arranged in the annulus between the setting key barrel (11) and the second column (22), wherein the lower end surface of the second sealing portion is flush with the lower end surface of the setting key barrel (11).

10. The seated key pulsing device of claim 1, wherein, A positioning body made of a magnetic material is arranged in the fish head (12), The fishing tool comprises a fishing claw, an electromagnet arranged in the fishing claw and adapted to the positioning body, and a motor connected with the fishing claw, wherein the positioning body can be attracted by the electromagnet after the fishing claw is electrified.

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