A coiled tubing chock-cutting downhole tool and its application method

Abstract

This invention provides a downhole cutting device for coiled tubing stuck at the wellhead and its application method, including a segmented outer sleeve, an anchoring and cutting mechanism, a retrieval and fixing mechanism, and a segmented cylindrical weighting and activating mechanism. The retrieval and fixing mechanism and the anchoring and cutting mechanism are connected through the segmented outer sleeve, which supports all components of the retrieval and fixing mechanism and the anchoring and cutting mechanism. After cutting is completed, all mechanism components are retrieved and brought out. This invention avoids irreversible damage to the coiled tubing material caused by forceful pulling and unblocking, such as plastic deformation and buckling deformation. Its greatest advantage is that it ensures the integrity of the coiled tubing above the cutting point and allows it to continue to be used.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas field development technology, and in particular relates to a downhole cutting tool and device for coiled tubing jamming and its application method. Specifically, it relates to a downhole unjamming cutting tool and its application method for coiled tubing string itself getting stuck during coiled tubing construction operations. Background Technology

[0002] Coiled tubing technology is widely used in oil and gas field exploration and development, and stuck coiled tubing strings are unavoidable. However, in the process of handling stuck coiled tubing strings, due to their small diameter, high elasticity, high toughness, and inability to rotate, it is difficult to use conventional methods for unblocking and retrieval. The usual unblocking method can only involve forcefully pulling, breaking off the tubing, and retrieving it in sections, resulting in the scrapping of the coiled tubing. The construction procedure is complex and time-consuming. Although chemical cutting and shaped charge bombs can be used now, their use is limited by the drawbacks of requiring wellhead cut-off and well control, and the risk of corrosion damage to the casing and tubing.

[0003] Internationally, a small-diameter thermoelectric internal cutting tool with cable delivery is used for unblocking and retrieval. However, this method requires the use of high-energy fuel to generate ion beam cutting. The process involves secondary hole opening for balancing, well control, irregular fish tops after cutting, cutting of the coiled tubing at the wellhead, and the use of heavy-duty hoisting equipment. Its use is subject to many limitations. Therefore, a downhole cutting tool for coiled tubing string jamming was developed. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a continuous tubing jamming point downhole cutting tool device and its application method. It can cut the continuous tubing from the downhole jamming point without cutting at the wellhead. This overcomes the shortcomings of the existing technology, such as strong pulling, segmented retrieval after breakage, wellhead cutting, and the need for well control.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] In a first aspect, a continuous tubing chute downhole cutting tool device includes a segmented outer sleeve, an anchoring and cutting mechanism, a retrieval and fixing mechanism, and a segmented cylindrical weighting and activation mechanism.

[0007] The recycling and fixing mechanism and the anchoring and cutting mechanism are connected through the segmented outer sleeve, which is used to support all components of the recycling and fixing mechanism and the anchoring and cutting mechanism.

[0008] The recovery and fixing mechanism includes a segmented recovery slip assembly and a segmented cylindrical recovery slip cone sleeve. The segmented recovery slip assembly and the segmented cylindrical recovery slip cone sleeve form a self-locking anchor to fix the cutting tool device on the continuous tubing.

[0009] The anchoring and cutting mechanism includes a split-cutter key plate assembly and a split-anchor slip assembly. The split-anchor slip assembly engages with the production tubing to form a cutting force point and tightens the split-cutter key plate assembly inward to cut the continuous tubing.

[0010] The weighting and activation mechanism is a segmented cylindrical weighting body used to strike and shear the pin, thereby activating the cutting and retrieval tool for the stuck coiled tubing string.

[0011] The segmented outer sleeve body is anchored to the segmented cylindrical recovery slip cone sleeve, and the segmented cylindrical recovery slip cone sleeve is connected to the segmented recovery slip assembly by shear pins.

[0012] The segmented anchoring slip assembly is assembled in the segmented outer sleeve body. The segmented anchoring slip assembly is connected to the segmented cutting key plate assembly by shearing pins. The segmented cutting key plate assembly is formed into an enclosure by a U-shaped cutting key plate retraction spring and is movably connected to the segmented outer sleeve body.

[0013] The cutting tool device, from bottom to top, consists of a split-cutting key plate assembly, a split-anchoring slip assembly, a split outer sleeve, a split-recovery slip assembly, a split-cylindrical recovery slip cone sleeve, and a weighted excitation mechanism.

[0014] Preferably, the segmented outer sleeve body is an inverted L-shaped structure with six segments enclosing each other, including segmented sleeve body fixing pin hole slots, sleeve body windows, and hanging spring pin hole slots. The top of the segmented outer sleeve body is provided with two segmented sleeve body fixing pin hole slots, the upper part is provided with a sleeve body window, and the lower part is provided with two hanging spring pin hole slots. The sleeve body window is rectangular and is used to accommodate the fixing clip, and the length of the sleeve body window is greater than the clip tooth block.

[0015] Preferably, one side of the U-shaped cutter key plate recovery spring is fixed to the split outer sleeve body by a recovery spring cylinder fixing pin, and the other side is passed through the split cutter key plate assembly by a recovery spring cutter key plate fixing hook; wherein, the spring cylinder fixing pin is connected to the spring pin hole groove.

[0016] Preferably, the segmented recovery slip assembly is a six-petaled combined structure, each petal including a recovery slip, a recovery slip self-locking inclined surface, a recovery slip shearing pin hole, and a recovery slip tooth. The inner surface of each petal of the segmented recovery slip assembly is provided with recovery slip teeth, and the outer surface of each petal is provided with a recovery slip self-locking inclined surface.

[0017] The split cylindrical recovery chuck cone sleeve is a cylindrical assembly structure consisting of two halves. Each half includes a recovery chuck cone sleeve, a self-locking inclined surface of the recovery chuck cone sleeve, and a shearing pin hole of the recovery chuck cone sleeve. The split cylindrical recovery chuck cone sleeve is provided with a tenon and mortise structure key and keyway that run through the top and bottom. It is fixed with a pin near the top and has a shearing pin hole at the bottom. The interior is a hexagonal inclined cavity, and the self-locking inclined surface of the recovery chuck cone sleeve is formed inside the inclined cavity.

[0018] The segmented cylindrical recovery slip cone sleeve self-locking inclined surface cooperates with the recovery slip self-locking inclined surface to form a self-locking mechanism, and the shear pin hole of the slip cone sleeve is connected to the corresponding recovery slip pin hole through the first shear pin.

[0019] Preferably, the segmented anchoring slip assembly is a six-petaled combined structure. Each petal includes an anchoring slip, an anchoring slip inclined surface, an anchoring slip spring groove, an anchoring slip shear pin hole, and an anchoring slip tooth. Each petal has an anchoring slip tooth on its outer side, an anchoring slip inclined surface on its inner side, and an anchoring slip shear pin hole at its lower end. The segmented anchoring slip assembly is assembled inside the segmented outer sleeve. The anchoring slip teeth are exposed on the sleeve window and are used to engage and anchor with the production tubing.

[0020] The segmented cutter key plate assembly is a six-petaled combined structure. Each petal includes an anchoring clamp spring, a cutter key plate inclined surface, a cutter key plate shearing pin hole, and a cutter. Each petal has a cutter on one side and a cutter key plate inclined surface at the upper end of the other side. The cutter key plate inclined surface has a cutter key plate shearing pin hole, and the bottom end is flat. The edges are cut at an angle to guide downward insertion.

[0021] The anchoring slip bevel mates with the cutter key plate bevel; the anchoring slip shear pin hole is connected to the cutter key plate shear pin hole through a second shear pin; the anchoring slip clamp spring engages with the anchoring slip clamp spring groove, so that each segment of the segmented anchoring slip assembly surrounds the jammed continuous tubing string.

[0022] Preferably, the segmented cylindrical weighted excitation mechanism is a cylindrical assembly structure with two segments enclosing each other. Each segment includes a segmented cylindrical weighted excitation cylinder, a dovetail anchor block, and a fixing pin. The two segments of the segmented cylindrical weighted excitation cylinder are inserted into each other's square arc grooves and are positioned and locked by the dovetail anchor block and the fixing pin.

[0023] Secondly, a method for applying a coiled tubing chuck downhole cutting tool device includes the following:

[0024] Step 1: Select a suitable size continuous tubing string and use a cutting and retrieval tool to cut and retrieve it when it gets stuck. Close the semi-sealing gate and the slip gate. After the slip is loaded, release the injection head and then open the blowout preventer.

[0025] Step 2: After inspecting the installation of the anchoring and cutting mechanism and the recovery and fixing mechanism, lift the tool into the blowout preventer.

[0026] Step 3: Apply a certain upward load tension through the injection head to keep the coiled tubing basically taut, and open the semi-sealing gate and slip gate.

[0027] Step 4: Release the installed cutting tool string and let it fall down along the stuck continuous tubing.

[0028] Step 5: Close the semi-sealed gate and the slip gate. After the slip is loaded, release the injection head and then open the blowout preventer.

[0029] Step 6: After installing and inspecting the split-type cylindrical weighted actuation device tool string, lift the tool into the blowout preventer.

[0030] Step 7: Apply a certain upward load tension through the injection head to keep the coiled tubing basically taut. Open the semi-sealing gate and the slip gate, and engage the segmented cylindrical weighting and activating mechanism to make it fall down along the stuck coiled tubing.

[0031] Step 8: Lift the jammed coiled tubing string, and the cutting blade tightens and cuts the coiled tubing body.

[0032] Step 9: After the stuck coiled tubing string is broken, the cutting blade is in a free state, and the segmented anchoring slip assembly is released from anchoring.

[0033] Step 10: Remove the stuck coiled tubing string and cutting tools to complete the unblocking and retrieval work.

[0034] Preferably, the coiled tubing jamming downhole cutting tool device is a segmented design. It is installed into the well without cutting the coiled tubing, and under the external force of the excitation device, it effectively stress-cuts the coiled tubing. Then, the coiled tubing is pulled up to ensure that the coiled tubing breaks at the jamming point without plastic deformation. At the same time, the coiled tubing jamming downhole cutting device can be pulled out of the wellhead along with the broken coiled tubing.

[0035] The embodiments of the present invention bring the following beneficial effects:

[0036] This invention avoids irreversible damage to the continuous tubing caused by excessive pulling and unblocking, such as plastic deformation and buckling. Its greatest advantage is that it ensures the integrity of the continuous tubing above the cutting point and allows it to continue to be used.

[0037] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained in accordance with the structures particularly pointed out in the description, claims and drawings.

[0038] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of a continuous tubing chuck downhole cutting tool device provided in an embodiment of the present invention;

[0040] Figure 2 This is a schematic diagram of the lowering state of a continuous tubing chuck downhole cutting tool device provided in an embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of the split outer sleeve structure of a continuous tubing chuck downhole cutting tool device provided in an embodiment of the present invention;

[0042] Figure 4 This is a schematic diagram of a segmented recovery slip assembly structure of a continuous tubing chuck downhole cutting tool device provided in an embodiment of the present invention;

[0043] Figure 5 This is a schematic diagram of the segmented conical slip sleeve structure of a continuous tubing chuck downhole cutting tool device provided in an embodiment of the present invention;

[0044] Figure 6 This is a schematic diagram of a segmented anchoring slip assembly structure of a continuous tubing chuck downhole cutting tool device provided in an embodiment of the present invention;

[0045] Figure 7 This is a schematic diagram of the split-cutter key plate assembly structure of a continuous tubing chuck downhole cutting tool device provided in an embodiment of the present invention;

[0046] Figure 8 This is a schematic diagram of the split-cutter key plate assembly recovery hanger spring and connection structure of a continuous tubing chuck downhole cutting tool device provided in an embodiment of the present invention;

[0047] Figure 9 This is a schematic diagram of the segmented cylindrical weighted excitation device of the continuous tubing chock downhole cutting tool device provided in an embodiment of the present invention.

[0048] In the diagram, 1-clamped coiled tubing string, 2-segmented outer sleeve, 3-segmented cylindrical recovery slip cone sleeve, 4-segmented recovery slip assembly, 5-segmented anchoring slip assembly, 6-anchoring slip clamp spring, 7-segmented cutter key plate assembly, 8-cutter key plate recovery hanging spring, 9-production tubing string (original tubing string in the well).

[0049] 10-Slotted cylinder fixing pin hole groove, 11-Cylinder window, 12-Spring hanging pin hole groove;

[0050] 13-Recycle the self-locking inclined surface of the collet cone sleeve; 14-Recycle the self-locking inclined surface of the collet; 15-Recycle the shearing pin hole of the collet cone sleeve; 16-Recycle the shearing pin hole of the collet; 17-First shearing pin; 18-Recycle the collet teeth.

[0051] 19-Anchoring slip bevel, 20-Cutter key plate bevel, 21-Anchoring slip spring groove, 22-Anchoring slip shearing pin hole, 23-Cutter key plate shearing pin hole, 24-Second shearing pin, 25-Anchoring slip tooth, 26-Cutter, 27-Recovery spring cylinder fixing pin, 28-Recovery spring cutter key plate fixing hook;

[0052] 29-Segmented cylindrical weighted excitation cylinder; 30-Dovetail-shaped anchor block; 31-Fixing pin. Detailed Implementation

[0053] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0054] Example 1, such as Figures 1-2 As shown, a downhole cutting tool device for coiled tubing is provided, including a split outer sleeve, an anchoring and cutting mechanism, a retrieval and fixing mechanism, and a split cylindrical weighting and activation mechanism. All mechanisms and devices adopt a split-body enclosing device to facilitate tool installation without cutting the coiled tubing at the wellhead.

[0055] The segmented outer sleeve 2 is used to support all components such as the recycling and fixing mechanism and the anchoring and cutting mechanism. The recycling and fixing mechanism and the anchoring and cutting mechanism are connected through the segmented outer sleeve device. After the cutting is completed, all mechanism components are recycled and taken out.

[0056] like Figure 3As shown, the structure of the segmented outer sleeve 2 is a six-lobed "inverted L-shape," used to support all tools and to retrieve and carry out the anchoring and cutting mechanism components after cutting. Each lobe includes a segmented sleeve fixing pin hole groove 10, a sleeve window 11, and a spring-loaded pin hole groove 12. The top of the segmented outer sleeve 2 has two segmented sleeve fixing pin hole grooves 10, which are fixed by pins and segmented sleeve cylindrical retraction slip cone sleeves 3; the upper part has a sleeve window 11 to accommodate the fixing slip, and its length is greater than the slip tooth block to form the vertical movement range of the shearing pin; the lower part has two spring-loaded pin hole grooves.

[0057] In this embodiment, the recovery and fixing mechanism includes a segmented recovery slip assembly 4 and a segmented cylindrical recovery slip cone sleeve 3. Through self-locking anchoring of the self-locking surface, the entire tool set is always fixed and locked on the continuous tubing. After the cutting is completed, all mechanism components are recovered and brought out by its fixation.

[0058] like Figure 4 As shown, the segmented recovery slip assembly 4 is a six-segment assembly used to engage with the jammed coiled tubing string 1 during cutting and retrieval, and to self-lock and anchor via a self-locking surface. Each segment includes a recovery slip self-locking inclined surface 14, a recovery slip shear pin hole 16, and recovery slip teeth 18.

[0059] Furthermore, each valve body has a retrieval slip tooth 18 on its inner surface and a retrieval slip self-locking inclined surface 14 with a taper of 7°19′ on its outer surface. The corresponding valve bodies are connected by a first shear pin 17.

[0060] like Figure 5 As shown, the segmented cylindrical recovery slip cone sleeve 3 is a cylindrical assembly consisting of two segments that fit together. It is used to clamp the segmented recovery slip assembly 4 inwardly to form a fixing mechanism and secure it to the blocked continuous tubing string 1. Each segment includes a self-locking inclined surface 13 of the recovery slip cone sleeve and a shear pin hole 15 of the recovery slip cone sleeve.

[0061] Furthermore, the segmented cylindrical recycling chuck cone sleeve 3 is provided with a tenon and mortise structure key and keyway that run through the top and bottom, and is fixed with a pin near the top. The bottom is provided with a recycling chuck cone sleeve shearing pin hole 15. The interior is a hexagonal inclined cavity, and a self-locking inclined surface 13 with a taper of 7°19′ is formed in the inclined cavity.

[0062] The self-locking inclined surface 13 of the recycling slip cone sleeve and the self-locking inclined surface 14 of the recycling slip cooperate to form a self-locking mechanism. The shear pin hole 15 of the recycling slip cone sleeve is connected to the corresponding shear pin hole 16 of the recycling slip through the first shear pin 17.

[0063] In this embodiment, the anchoring and cutting mechanism includes a split-cutting key plate assembly 7 and a split-anchoring slip assembly 5. The split-anchoring slip assembly 5 engages with the production tubing string (original tubing string in the well) 9 to form a cutting force point, and tightens the split-cutting key plate assembly 7 inward to cut the coiled tubing.

[0064] like Figure 6 As shown, the segmented anchor slip assembly 5 is a six-lobed assembly, assembled inside the segmented outer sleeve body 2. Each lobe includes an anchor slip inclined surface 19, an anchor slip spring groove 21, an anchor slip shear pin hole 22, and an anchor slip tooth 25. The outer side of each lobe is provided with the anchor slip tooth 25, the inner side is provided with the anchor slip inclined surface 19, and the lower end is provided with the anchor slip shear pin hole 22. The segmented anchor slip assembly 5 is assembled inside the segmented outer sleeve body 2, and the anchor slip tooth 25 is exposed on the sleeve window 11. The anchor slip tooth 25 is used to engage and anchor with the production tubing string (the original tubing string in the well) 9 and can tighten the segmented cutter key plate assembly 7 inward to cut (scratch) the jammed continuous tubing string 1.

[0065] like Figure 7 As shown, the segmented cutter key plate assembly 7 is a six-petaled assembly. Each petal includes an anchoring clamp spring 6, a cutter key plate inclined surface 20, a cutter key plate shearing pin hole 23, and a cutter 26. Each petal has a cutter 26 on one side and a cutter key plate inclined surface 20 with a taper of 7°19′ on the upper end of the other side, which is used to cooperate with the corresponding anchoring clamp inclined surface 19. The cutter key plate inclined surface 20 has a cutter key plate shearing pin hole 23, a flat bottom end, and an angled edge to guide downward insertion.

[0066] The anchoring slip tooth 25 has a 90° structural angle and bidirectional anchoring. The inner side is provided with an anchoring slip inclined surface 19 with a 7°19′ self-locking angle and a cutter cone seat. The anchoring slip inclined surface 19 cooperates with the corresponding cutter key plate inclined surface 20. The anchoring slip shear pin hole 22 is connected to the corresponding cutter key plate shear pin hole 23 through the second shear pin 24. The anchoring slip clamp spring 6 is engaged with the anchoring slip clamp spring groove 21 to make each segment of the segmented anchoring slip group surround the jammed continuous tubing string 1.

[0067] Furthermore, each petal of each segmented cutting key plate assembly 7 is provided with a recyclable spring-loaded cutting key plate fixing hook 28, which is welded to each petal of the segmented cutting key plate assembly.

[0068] In this embodiment, the segmented outer sleeve 2 further includes a U-shaped cutter key plate recovery spring 8, such as... Figure 8As shown, one side of the U-shaped cutter key plate recovery spring 8 is fixed to the split outer sleeve 2 by the recovery spring cylinder fixing pin 27, and the other side is inserted into the leaf spring groove of the split cutter key plate assembly 7 by the recovery spring cutter key plate fixing hook 28, and can move up and down in the fixing hook; wherein, the spring cylinder fixing pin 27 is connected to the spring pin hole groove 12.

[0069] Furthermore, the functions of the U-shaped cutter key plate recovery spring 8 are as follows: First, to keep the cutter of the split cutter key plate assembly 7 tightly attached to the jammed continuous tubing string 1; second, when the cutting is completed and the continuous tubing string is lifted, the split anchoring slip assembly 5 moves upward along the lower edge of the upper cylinder window 11 of the split outer sleeve 2, thereby eliminating the self-locking between the anchoring slip inclined surface 19 and the cutter key plate inclined surface 20. After the split anchoring slip 5 is released and anchored, the continuous tubing attached to the inner ring of the split cutter key plate assembly 7 is removed and disintegrated. At this time, the U-shaped cutter key plate recovery spring 8 hooks onto the split cutter key plate assembly 7 and pulls it out with the split outer sleeve 2; third, the U-shaped cutter key plate recovery spring 8 can move up and down inside the handle to form the up and down movement range of the shearing pin.

[0070] In this embodiment, the weighting and triggering mechanism is a segmented cylindrical weighting body, which is used to strike and shear the pin to activate the coiled tubing string cutting and retrieval tool when it is stuck.

[0071] like Figure 9 As shown, the segmented cylindrical weighted excitation mechanism includes a segmented cylindrical weighted excitation cylinder 29, a dovetail-shaped anchor block 30, and a fixing pin 31.

[0072] Furthermore, the segmented cylindrical weighted excitation cylinder 29 is made of tungsten nickel iron with a high density (18.75 g / cm3). The left and right shells of the two segments are inserted into each other's arc grooves and positioned and locked by dovetail-shaped anchor blocks 30 and fixing pins 31 to form a complete circular shell.

[0073] In this embodiment, the cutting tool device is connected in sequence from bottom to top as follows: a split-cutting key plate assembly 7, a split-type anchoring slip assembly 5, a split-type outer sleeve 2, a split-type recovery slip assembly 4, a split-type cylindrical recovery slip cone sleeve 3, and a split-type cylindrical weighted excitation mechanism 9 for activating the cutter.

[0074] Example 2 provides an application method for a coiled tubing chuck downhole cutting tool device, including the following:

[0075] Step 1: Select a suitable size coiled tubing chock downhole cutting tool, close the semi-sealing gate and slip gate, release the injection head after the slips are in place, and then open the blowout preventer.

[0076] Step 2: Install the anchoring and cutting mechanism, the recovery and fixing mechanism, and the split outer sleeve body, and after inspection, lift the tool string into the blowout preventer;

[0077] Specifically, the segmented recovery slip group 4 in the recovery fixing mechanism is engaged with the corresponding first shear pin 17 and then enclosed on the jammed continuous tubing string 1.

[0078] After the split cone cutter key plate assembly 7 in the anchoring and cutting mechanism is engaged with the corresponding second shear pin 24, it is surrounded by the anchoring slip spring 6 on the jammed continuous tubing string 1.

[0079] After fitting the split outer sleeve body 2 into the sleeve, and connecting it with the corresponding split anchoring slip assembly 5, split cutter key plate assembly 7, and U-shaped cutter key plate recovery hanging spring 8, screws are used to pass through the split sleeve body fixing pin hole groove 10 and fix it to the corresponding pin hole at the top of the split sleeve body cone sleeve 3.

[0080] Step 3: Apply a certain upward load tension through the injection head to keep the coiled tubing basically taut, and open the semi-sealing gate and slip gate.

[0081] Step 4: Release the installed cutting tool string and let it fall down along the stuck coiled tubing. During this process, you can move the coiled tubing slightly (relax tension, raise tension - but do not exceed the original tension).

[0082] Specifically, the entire cutting tool string is dropped into the well along the jammed coiled tubing string 1, allowing the cutting tool to fall down along the jammed coiled tubing. During this process, the coiled tubing can be moved slightly to flex and straighten, helping the cutting tool string descend to the jammed position.

[0083] Step 5: Close the semi-sealed gate and the slip gate. After the slip is loaded, release the injection head and then open the blowout preventer.

[0084] Step 6: Install the segmented cylindrical weighted actuation mechanism, and after inspection, lift the tool string into the blowout preventer.

[0085] Specifically, the segmented cylindrical weighted excitation mechanism is engaged, and under the action of gravity, it impacts the tool string, cutting off the two pins: "segmented recovery slip group 4 and segmented cylindrical recovery slip cone sleeve 3" and "segmented cutter key plate group 7 and corresponding segmented anchoring slip group 5", namely the first shearing pin 17 and the second shearing pin 24.

[0086] In this process, the segmented recovery slip assembly 4 is tightened during the descent of the segmented cylindrical recovery slip cone sleeve 3, locking the stuck coiled tubing string 1 and forming a fixed position under the action of the self-locking angle. At the same time, the cutter key plate inclined surface 20 of the segmented cutter key plate assembly 7 cooperates with the anchoring slip inclined surface 19 of the segmented anchoring slip assembly 5, and the cutting blade 26 is tightened and cuts into the stuck coiled tubing string 1 body. The segmented anchoring slip assembly 5 is locked onto the inner wall of the production string (the original string in the well) 9, forming a point of force.

[0087] Step 7: Apply a certain lifting load tension through the injection head to keep the coiled tubing basically taut. Open the semi-sealing gate and the slip gate, and engage the split-type cylindrical weighting and activating mechanism to make it fall down along the stuck coiled tubing. During this process, the coiled tubing can be moved slightly (relaxing tension, raising tension - but not exceeding the original raising tension).

[0088] Step 8: Lift the stuck coiled tubing string 1. The cutting blade 26 is tightened under the action of the anchoring slip inclined surface 19 and the cutting blade key plate inclined surface 20, cutting the coiled tubing body. Continue to move the coiled tubing up and down to stop it. The cutting blade 26 gradually cuts into the stuck coiled tubing string 1 body, forming a stress concentration point. Under a certain lifting load, the stuck coiled tubing string 1 is pulled off.

[0089] Step 9: After the stuck coiled tubing string 1 is broken, the cutting blade 26 is in a free state, and the segmented anchoring slip group 5 is released from anchoring.

[0090] Step 10: Remove the coiled tubing and tool string to complete the unblocking and salvage operation;

[0091] Specifically, the coiled tubing string 1, which is stuck, is lifted up. The recovery and fixing mechanism device, which is fixed on the coiled tubing string, is driven by the split outer sleeve body 2 to pull up the "recovery and fixing mechanism device" which is released from the fixed state and moves out to the ground along with the coiled tubing.

[0092] In this embodiment, the coiled tubing jamming downhole cutting tool is designed in a segmented manner. It is installed into the well without cutting the coiled tubing, and under the external force of the excitation device, it effectively stress-cuts the coiled tubing. Then, by lifting the coiled tubing, it can be ensured that the coiled tubing breaks at the jamming point without plastic deformation. At the same time, the coiled tubing jamming downhole cutting tool can be pulled out of the wellhead along with the broken coiled tubing.

[0093] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0094] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A continuous tubing chuck downhole cutting tool device, characterized in that, It includes a segmented outer sleeve, an anchoring and cutting mechanism, a recovery and fixing mechanism, and a segmented cylindrical weighting and excitation mechanism; The recycling and fixing mechanism and the anchoring and cutting mechanism are connected by the segmented outer sleeve, which is used to support all components of the recycling and fixing mechanism and the anchoring and cutting mechanism. The split outer sleeve body is an inverted L-shaped structure with six petals surrounding it. Each petal includes a split sleeve body fixing pin hole groove, a sleeve body window, and a hanging spring pin hole groove. The top of the split outer sleeve body is provided with two split sleeve body fixing pin hole grooves, the upper part is provided with a sleeve body window, and the lower part is provided with two hanging spring pin hole grooves. The recovery and fixing mechanism includes a segmented recovery slip assembly and a segmented cylindrical recovery slip cone sleeve. The segmented recovery slip assembly is a six-lobed enclosed assembly structure, and the segmented cylindrical recovery slip cone sleeve is a two-lobed enclosed assembly structure. The segmented recovery slip assembly and the segmented cylindrical recovery slip cone sleeve form a self-locking anchor to fix the cutting tool device on the continuous tubing. The anchoring and cutting mechanism includes a split-cutting key plate assembly and a split-anchoring slip assembly. Both the split-cutting key plate assembly and the split-anchoring slip assembly are six-lobed enclosed combination structures. The split-anchoring slip assembly engages with the production tubing to form a cutting force point and tightens the split-cutting key plate assembly inward to cut the continuous tubing. The segmented cylindrical weighting and excitation mechanism is a combined structure with two segments enclosing each other, used to impact and shear the pin, and to activate the cutting and retrieval tool when the coiled tubing string is stuck. The segmented outer sleeve body is anchored to the segmented cylindrical recovery slip cone sleeve, and the segmented cylindrical recovery slip cone sleeve is connected to the segmented recovery slip assembly by shear pins. The segmented anchoring slip assembly is assembled in the segmented outer sleeve body. The segmented anchoring slip assembly is connected to the segmented cutting key plate assembly by shearing pins. The segmented cutting key plate assembly is formed into an enclosure by a U-shaped cutting key plate retraction spring and is movably connected to the segmented outer sleeve body. The cutting tool device is connected in sequence from bottom to top as follows: a split-cutting key plate assembly, a split-anchoring slip assembly, a split-outer sleeve, a split-recovery slip assembly, and a split-cylindrical recovery slip cone sleeve. In the ignition state, the split-outer sleeve has a split-cylindrical weighted ignition mechanism.

2. The coiled tubing chock-cutting downhole tool device according to claim 1, characterized in that, The cylindrical window on the segmented outer sleeve is rectangular and is used to accommodate the fixed clips, and the length of the cylindrical window is greater than the clip tooth block.

3. The coiled tubing chock-cutting downhole tool device according to claim 2, characterized in that, The U-shaped cutter key plate recovery spring is fixed on one side to the split outer sleeve body by the recovery spring cylinder fixing pin, and on the other side by the recovery spring cutter key plate fixing hook to the petal body of the split cutter key plate assembly; The spring cylinder fixing pin is connected to the spring pin hole groove.

4. The coiled tubing chock-cutting downhole tool device according to claim 1, wherein the recovery and fixing mechanism comprises a segmented recovery slip assembly and a segmented cylindrical recovery slip cone sleeve, characterized in that, Each segment of the segmented recovery slip assembly includes a recovery slip, a recovery slip self-locking inclined surface, a recovery slip shearing pin hole, and recovery slip teeth. The inner surface of each segment of the segmented recovery slip assembly is provided with recovery slip teeth, and the outer surface of each segment is provided with a recovery slip self-locking inclined surface. Each segment of the segmented cylindrical recovery slip cone sleeve includes a recovery slip cone sleeve, a self-locking inclined surface of the segmented cylindrical recovery slip cone sleeve, and a shearing pin hole of the recovery slip cone sleeve. The segmented cylindrical recovery slip cone sleeve is provided with a tenon and mortise structure key and keyway that run through the top and bottom. It is fixed with a pin near the upper part and has a shearing pin hole at the lower part. The interior is a hexagonal inclined cavity, and the self-locking inclined surface of the segmented cylindrical recovery slip cone sleeve is formed in the inclined cavity. The self-locking inclined surface of the segmented cylindrical recovery slip cone sleeve cooperates with the self-locking inclined surface of the segmented recovery slip group to form a self-locking mechanism, and the shear pin hole of the slip cone sleeve is connected to the corresponding recovery slip pin hole through the first shear pin.

5. The coiled tubing chuck downhole cutting tool device according to claim 1, wherein the anchoring and cutting mechanism comprises a segmented cutting key plate assembly and a segmented anchoring slip assembly, characterized in that, Each segment of the segmented anchoring slip assembly includes an anchoring slip, an anchoring slip inclined surface, an anchoring slip spring groove, an anchoring slip shear pin hole, and an anchoring slip tooth. Each segment has an anchoring slip tooth on its outer side, an anchoring slip inclined surface on its inner side, and an anchoring slip shear pin hole at its lower end. The segmented anchoring slip assembly is assembled inside the segmented outer sleeve. The anchoring slip teeth are exposed on the sleeve window and are used to engage and anchor with the production tubing. Each lobe of the segmented cutter key plate assembly includes an anchoring clamp spring, a cutter key plate inclined surface, a cutter key plate shearing pin hole, and a cutter. Each lobe has a cutter on one side and a cutter key plate inclined surface at the upper end of the other side. The cutter key plate inclined surface has a cutter key plate shearing pin hole, and the bottom end is flat. The edges are cut at an angle to guide downward insertion. The anchoring slip bevel mates with the cutter key plate bevel; the anchoring slip shear pin hole is connected to the cutter key plate shear pin hole through a second shear pin; the anchoring slip clamp spring engages with the anchoring slip clamp spring groove, so that each segment of the segmented anchoring slip assembly surrounds the jammed continuous tubing string.

6. The coiled tubing chuck downhole cutting tool device according to claim 1, characterized in that, Each segment of the split cylindrical weighted excitation mechanism includes a split cylindrical weighted excitation cylinder, a dovetail anchor block, and a fixing pin. The two segments of the split cylindrical weighted excitation cylinder are inserted into each other's square arc grooves and are positioned and locked by the dovetail anchor block and the fixing pin.

7. A method for applying the coiled tubing chuck downhole cutting tool device according to any one of claims 1-6, characterized in that, Step 1: Select a suitable size coiled tubing string and use a cutting and retrieval tool when it gets stuck. Close the semi-sealing gate and the slip gate. After the slips bear the load, release the injection head and open the blowout preventer. Step 2: Install the anchoring and cutting mechanism, the recovery and fixing mechanism, and the split outer sleeve. After inspection, lift the cutting tool string into the blowout preventer. Step 3: Apply a certain upward load tension through the injection head to keep the coiled tubing basically taut, and open the semi-sealing gate and slip gate. Step 4: Release the installed cutting tool string and let it fall down along the stuck continuous tubing. Step 5: Close the semi-sealed gate and the slip gate. After the slip is loaded, release the injection head and then open the blowout preventer. Step 6: Install the segmented cylindrical weighted actuation mechanism, and after inspection, lift the cutting tool string into the blowout preventer. Step 7: Apply a certain upward load tension through the injection head to keep the coiled tubing basically taut. Open the semi-sealing gate and the slip gate, and engage the segmented cylindrical weighting and activating mechanism to make it fall down along the stuck coiled tubing. Step 8: Lift the jammed coiled tubing string, and the cutting blade tightens and cuts the coiled tubing body. Step 9: Pull off the jammed continuous tubing string, free the cutting blade, and release the segmented anchoring slip assembly from anchoring. Step 10: Remove the stuck coiled tubing string and cutting tool string to complete the unblocking and retrieval work.

8. An application method of the coiled tubing chuck downhole cutting tool device as described in claim 7, characterized in that, The coiled tubing jamming downhole cutting tool is designed in a segmented manner. It is installed into the well without cutting the coiled tubing, and under the external force of the excitation device, it effectively stress-cuts the coiled tubing. Then, the coiled tubing is pulled up to ensure that the coiled tubing breaks at the jamming point without plastic deformation. At the same time, the coiled tubing jamming downhole cutting tool can be pulled out of the wellhead along with the broken coiled tubing.

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