Milling and fishing integrated combined joint and downhole tool

Abstract

The invention provides a milling and fishing integrated combined joint and a downhole tool, the combined joint comprises an upper connecting part, a reducing part and a lower connecting part which are sequentially arranged from top to bottom, the upper end of the upper connecting part is provided with a first internal thread section to be connected with an upper drilling tool, and the lower end of the upper connecting part is in threaded connection with the upper end of the reducing part; a first external thread section is arranged at the lower end of the reducing part so as to be connected with a casing milling pipe for casing milling and fishing integrated operation; the lower end of the lower connecting part is provided with a second external thread section for connecting a lower drilling tool. The downhole tool comprises the combined type connector and further comprises a casing milling pipe with a coupling, the casing milling pipe with the coupling comprises the coupling and a pipe body, and the coupling is arranged on the upper portion of the casing milling pipe with the coupling. The milling and fishing integrated combined joint provided by the invention can meet the requirements of different borehole sizes and different inter-ring gaps on milling and fishing operations, and can realize rapid and accurate fishing.

Description

Technical Field

[0001] The invention relates to the field of salvaging operations of fallen objects in oil drilling projects, and in particular to a sleeve milling and salvaging integrated combined joint and a downhole tool. Background Art

[0002] At present, in drilling projects, tools and drilling tools fail in large or even super-large boreholes. When dealing with fish salvage operations in boreholes of 406mm and above, in order to prevent the salvage tool from missing the fish head, resulting in multiple salvages or long tool preparation time and poor tool quality leading to complex failure sets, every effort is made to narrow the gap between the salvage tool and the fish, which is conducive to the success of the fish salvage. Large-sized pipes are often used as the first choice for salvage auxiliary tools such as pullers. However, the fixation of large-sized pipes and salvage tools has always been a problem at the drilling site. Various methods are used to shrink the inner diameter of large-sized pipes so that they can be better fixed on the salvage tools, which is conducive to improving the success rate of salvage.

[0003] A Chinese patent with application number "CN202022226042.0" and name "Forced Local Reverse Circulation Casing and Fishing Integrated Tool" discloses a forced local reverse circulation casing and fishing integrated tool, which is composed of a flow channel conversion short section, a storage and straightening short section, a casing and fishing integrated short section and a casing milling head connected in sequence from top to bottom through a tubing coupling; the flow channel conversion short section includes a cylindrical first body, a first blind hole and a second blind hole are respectively opened from the top and the bottom of the body, and a plurality of alternately arranged ejection flow channels and return flow channels are opened in the side wall, the top of the ejection flow channel is connected to the first blind hole, and the bottom is connected to the outside of the body, a leather cup with an opening facing downward is provided on the outside of the first body between the return flow channel and the ejection flow channel, and a filter is fixed in the second blind hole; the storage and straightening short section includes a straightening device body and a single-flow valve body arranged in its inner cavity; the tool can force the formation of a local reverse circulation flow channel at the bottom of the well, make full use of hydraulic energy to flush the debris carried, and realize the casing and fishing in one go through the casing and fishing integrated short section, thereby saving construction costs, improving construction efficiency, and shortening the construction period. However, the present application is different from its structure. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention aims to solve one or more problems in the prior art. For example, one of the purposes of the present invention is to provide a combined casing milling and fishing joint and a downhole tool that has a high success rate of fishing, fast and accurate fishing, and meets the requirements of different wellbore sizes for the insertion of casing fishing tools.

[0005] In order to achieve the above-mentioned objectives, the present invention provides, on one hand, a casing milling and salvaging integrated modular joint, which may include: an upper connecting part, a reducing part and a lower connecting part arranged in sequence from top to bottom, wherein a first internal thread section is provided at the upper end of the upper connecting part to connect with an upper drilling tool, and the lower end of the upper connecting part is threadedly connected to the upper end of the reducing part; a first external thread section is provided at the lower end of the reducing part to connect with a casing milling pipe for casing milling and salvaging integrated operations; and a second external thread section is provided at the lower end of the lower connecting part to connect with a lower drilling tool.

[0006] According to one or more exemplary embodiments of an aspect of the present invention, the first external thread segment may include a double-stage external thread segment.

[0007] According to one or more exemplary embodiments of an aspect of the present invention, a high-torque-resistance buckle may be provided on the outer circumference of the reducer to speed up the connection with the drilling tool.

[0008] According to one or more exemplary embodiments of an aspect of the present invention, the modular joint may further include an inner flow channel disposed at a central axis thereof, wherein the inner flow channel runs through the upper connecting portion, the reducing portion, and the lower connecting portion.

[0009] According to one or more exemplary embodiments of an aspect of the present invention, the first internal thread segment and the second external thread segment may be connected to the drilling tool using the same buckle type.

[0010] Another aspect of the present invention provides a casing, milling and fishing integrated downhole tool, and the downhole tool may include the combined joint as described above.

[0011] According to one or more exemplary embodiments of another aspect of the present invention, the downhole tool may further include a milled pipe with a collar, wherein the milled pipe with a collar includes a collar and a pipe body, and the collar is disposed on an upper portion of the milled pipe with a collar.

[0012] According to one or more exemplary embodiments of another aspect of the present invention, a through hole may be provided at the central axis of the collared milled pipe, which can circulate working fluid and accommodate fish that have been milled out.

[0013] According to one or more exemplary embodiments of another aspect of the present invention, the upper and lower ends of the pipe body may be respectively provided with a second internal thread segment and a third external thread segment, and the second internal thread segment cooperates with the first external thread segment to connect the milled pipe with coupling sleeve to the reducer.

[0014] According to one or more exemplary embodiments of another aspect of the present invention, the second internal thread segment and the third external thread segment may include a double-stage internal thread segment and a double-stage external thread segment, respectively.

[0015] Compared with the prior art, the beneficial effects of the present invention include at least one of the following:

[0016] (1) The integrated milling and salvaging joint provided by the present invention can meet the requirements of milling and salvaging operations for different wellbore sizes and different inter-ring gaps, and can achieve fast and accurate salvaging.

[0017] (2) The integrated milling and salvaging joint provided by the present invention can meet the needs of different downhole conditions. The combined joint is suitable for vertical drilling, screws, shock absorbers, stabilizers and other tools in large wells as well as drilling tools for fish salvaging operations.

[0018] (3) The milling pipe with a coupling in the integrated milling and fishing downhole tool provided by the present invention can achieve wellhead connection with the hanging card in the engaged state, thereby maximizing the safety of the operation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other objects and / or features of the present invention will become more apparent through the following description in conjunction with the accompanying drawings, in which:

[0020] Figure 1 A schematic cross-sectional structure diagram of a modular joint according to an exemplary embodiment of the present invention is shown;

[0021] Figure 2 A schematic cross-sectional structure diagram of a milled pipe with a collar according to an exemplary embodiment of the present invention is shown.

[0022] Description of reference numerals:

[0023] 11-upper connecting portion, 111-first internal thread segment, 12-diameter reducing portion, 121-first external thread segment, 122-high torque resistance buckle, 13-lower connecting portion, 131-second external thread segment, 14-inner flow channel;

[0024] 21 - coupling, 22 - pipe body, 221 - second internal thread section, 222 - third external thread section, 23 - through hole. DETAILED DESCRIPTION

[0025] Hereinafter, a casing, milling and fishing integrated combined joint and a downhole tool of the present invention will be described in detail in conjunction with the accompanying drawings and exemplary embodiments.

[0026] In the description of the present application, it should be understood that the terms "upper", "lower", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0027] The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0028] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Exemplary Embodiment 1

[0030] Figure 1 A schematic cross-sectional structure diagram of a modular joint according to an exemplary embodiment of the present invention is shown.

[0031] This exemplary embodiment provides a sleeve milling and salvaging integrated modular joint.

[0032] like Figure 1 As shown in , the combined joint mainly includes: an upper connecting part 11, a reducing part 12 and a lower connecting part 13 which are arranged in sequence from top to bottom.

[0033] The upper end of the upper connecting part 11 is provided with a first internal thread section 111 to connect the upper drilling tool, and the lower end of the upper connecting part 11 is threadedly connected to the upper end of the reducing part 12. The lower end of the reducing part 12 is provided with a first external thread section 121 to connect the casing milling pipe for casing milling and salvaging integrated operation. Further, the first external thread section may include a double-stage external thread section. The lower end of the lower connecting part 13 is provided with a second external thread section 131 to connect the lower drilling tool, and the drilling tool here may include a salvage tool or a safety joint.

[0034] In this exemplary embodiment, a high torque resistance buckle 122 may be provided on the outer circumference of the reducer 12 to speed up the connection with the drill. The outer diameter of the reducer is consistent with the outer diameter of the casing with a diameter of 508 mm or 339.7 mm connected thereto, and is completely connected by thread (thread). The connection buckle type may be a double-stage positive buckle, and the buckle type of the outer circumference of the reducer may be a double-stage positive male buckle, which minimizes the workload and heat impact of the welding operation, and the machining method ensures the coaxiality of the joint and the pipe, and promotes the improvement of tool quality and standardized production and promotion.

[0035] In this exemplary embodiment, the combined joint may further include an inner flow channel 14 disposed at the central axis thereof, and the inner flow channel 14 runs through the upper connecting portion 11, the diameter reducing portion 12 and the lower connecting portion 13. Here, the inner flow channel may satisfy the circulation of the working fluid.

[0036] In this exemplary embodiment, the first internal thread section 111 and the second external thread section 131 can be connected to the drilling tool using different buckle types, so that the upper and lower connecting parts have the necessary conditions for combining with any reducer. The upper connecting part can use a 630 or 410 conventional joint to quickly interconnect with the salvage drilling tool, and the joint buckle type is as consistent as possible with the buckle type of the lower end of the salvage drilling tool to reduce unnecessary matching joints to simplify the salvage drilling tool structure to the greatest extent. Similarly, the lower connecting part can use a 521 or 411 conventional buckle type to quickly connect with the salvage tool or safety joint, and no matching joint is added in the middle to prevent the fish from being stuck out of the safety joint and leaving more fish behind.

[0037] Exemplary Embodiment 2

[0038] Figure 2 A schematic cross-sectional structure diagram of a milled pipe with a collar according to an exemplary embodiment of the present invention is shown.

[0039] This exemplary embodiment provides an integrated casing, milling and fishing downhole tool, which may include the combined joint as described in Exemplary Embodiment 1.

[0040] like Figure 2 As shown in , the downhole tool may also include a sleeve milling pipe with a collar, which mainly includes a collar 21 and a pipe body 22, and the collar 21 is arranged on the upper part of the sleeve milling pipe. The sleeve milling pipe with a collar is a hollow pipe, and a through hole 23 may be arranged at the central axis thereof, and can be used to circulate working fluid and accommodate fish that are milled out. The upper end and the lower end of the pipe body 22 may be respectively provided with a second internal thread section 221 and a third external thread section 222, and the second internal thread section may cooperate with the first external thread section to connect the sleeve milling pipe with a collar and a reducing portion. Here, the second internal thread section and the third external thread section may respectively include a double-stage internal thread section and a double-stage external thread section.

[0041] In this exemplary embodiment, the female coupling of the two-stage milling pipe with coupling is connected to the outer circumference of the reducer, and the connection buckle type of the outer circumference of the reducer is a two-stage positive male buckle. If the length of the milling pipe is increased, multiple long two-stage coupling milling pipes can be used to interconnect, and the short milling pipe is used as a welded joint short section or a wall hook or a dial. The milling pipes with a diameter of 508mm or 339.7mm have the same outer diameter and come with couplings, which is conducive to the hoisting of tools, the seat card during the wellhead assembly, and the interconnection of multiple milling pipes, and promotes the safety of the salvage drilling tool assembly itself.

[0042] In order to better understand the above exemplary embodiments 1-2, they are further described below with reference to specific examples.

[0043] Example 1

[0044] In this example, for wells with diameters of 406 mm and 444.5 mm, the available drilling tool combinations are as follows: drill pipe, 6 weighted drill pipes, jar, 6 weighted drill pipes, variable-buckle joints, 3 drill collars, upper connection, reducer with a diameter of 339.7 mm, lower connection, milling pipe with a diameter of 339.7 mm, and milling shoe with a diameter of 365 mm. The 131 joint is connected to the slip tube or safety joint and male and female cones. If there is a risk of the fish-dropping water hole being blocked, a normally open drilling tool bypass valve is first connected to the lower end of the 131 joint before connecting the remaining tools. The length of the milling pipe can be reasonably adjusted according to the distance from the fish drop to the salvage tool.

[0045] Example 2

[0046] In this example, for a wellbore with a diameter of 558.8 mm, the available drilling tool combinations are as follows: drill pipe, 6 weighted drill pipes, jar, 6 weighted drill pipes, variable joints, 3 drill collars, upper connection, reducer with a diameter of 473 mm, lower connection, milling pipe with a diameter of 473 mm and milling shoe with a diameter of 500 mm. The 131 joint is connected to the slip bucket or safety joint and the male and female cones of the combined drilling tool for milling and salvaging. If there is a risk of the fish hole being blocked, a normally open drilling tool bypass valve is first connected to the lower end of the 131 joint before connecting the remaining tools. The length of the milling pipe can be reasonably adjusted according to the distance from the fish to the salvage tool.

[0047] Example 3

[0048] In this example, for a borehole with a diameter of 660.4 mm, the following drilling tools can be used: drill pipe, 6 weighted drill pipes, jar, 6 weighted drill pipes, variable joint, 3 drill collars, upper connection, reducer with a diameter of 508 mm, lower connection, milling pipe with a diameter of 508 mm, milling shoe with a diameter of 534 mm, and a milling shoe with a built-in slip bucket or safety joint and male and female cones. The drill pipe is equipped with a 6-pin drill rod, 6 weighted drill rods, a jar, 6 weighted drill rods, a variable-buckle joint, 3 drill collars, an upper connection, a reducer with a diameter of 609.6 mm, a lower connection, a milling pipe with a diameter of 609.6 mm, and a milling shoe with a diameter of 635 mm. The lower end of the 131 joint is connected to a slip bucket or a safety joint and a male and female cone milling and salvaging integrated drilling tool. If there is a risk of the fish falling water hole being blocked, a normally open drill tool bypass valve is connected under the 131 joint before connecting the remaining tools. The length of the milling pipe can be reasonably adjusted according to the distance from the fish falling to the salvaging tool.

[0049] The use method / working process of the above-mentioned example 1-3 drilling tool assembly is as follows:

[0050] When the milling pipe is lowered, the wellbore wall must remain stable. When the drill reaches the theoretical fish top of the milling shoe, the drill bit is filled with working fluid and the idling torque value, lifting and lowering friction values ​​are tested at a low speed of 20r / min. The milling displacement meets the requirements of carrying drill cuttings and remains stable; the torque is set to idling torque + 3~5kN.m, and the drill bit is slowly lowered at a low speed of 20r / min. The drilling pressure is controlled below 20kN, and the drill bit fish head is inserted. After confirming that the fish head has entered the milling shoe, the speed is adjusted to 40~45r / min, and the fish is started. When the milling reaches the point where the salvage tool is about to be connected, When the fish is touched, the downward milling is suspended, and the milling is continued after the annular drill cuttings are circulated and cleared. When the pump pressure and torque rise, it means that the fish has entered the salvage tool. At this time, the salvage can be made according to the requirements of the salvage tool. During the buckle making process, the pump can be stopped or the displacement can be reduced according to the downhole situation. After the buckle making is completed, the drill tool is slowly lifted up. The lifting force is greater than the sum of the weight of the salvage drill tool, the lifting friction, the weight of the fish and 100kN. Check whether the fish is unstuck. If it is unstuck, the drill is lifted smoothly. If the drill cannot be unstuck, the safety joint is withdrawn to lift the salvage drill tool, and the milling pipe is removed for the next operation. Here, when using the salvage combination, the length of the fish should not exceed 20 meters, so that the drill bit can be lifted out of the turntable at one time. First remove the drill bit, then lift the fish, and finally remove the milling pipe. If the fish exceeds 28 meters, the lower end of the 131 joint is not connected to the salvage tool, otherwise the fish and milling pipe cannot be removed on the ground.

[0051] In summary, the advantages proposed by the present invention include at least one of the following:

[0052] (1) The integrated milling and salvaging joint provided by the present invention can achieve zero welding operation on site, thereby minimizing the damage to the tool strength caused by welding heat.

[0053] (2) The integrated downhole tool for milling and salvage provided by the present invention adopts double-stage buckles and high-torque-resistant buckles for connection, making on-site connection operations safer and faster. The threaded quick connection shortens the preparation and connection operation time of the salvage tool as much as possible, reduces other complex risks caused by the fish staying still in the well for a long time, and standardized production fundamentally guarantees the quality of the tool. The threaded connection creates the necessary conditions for rapid on-site assembly, which is conducive to its widespread promotion and use.

[0054] Although the above has described a milling and fishing integrated combined joint and downhole tool of the present invention in combination with exemplary embodiments, it should be clear to those skilled in the art that various modifications and changes may be made to the exemplary embodiments of the present invention without departing from the spirit and scope defined by the claims.

Claims

1. A milling and salvaging integrated joint. It is characterized in that The modular joint comprises: an upper connecting portion, a reducing portion and a lower connecting portion arranged in sequence from top to bottom, wherein: The upper end of the upper connecting part is provided with a first internal thread section for connecting the upper drilling tool, and the lower end of the upper connecting part is threadedly connected with the upper end of the reducing part; A first external thread section is provided at the lower end of the reducing portion to connect the casing milling pipe to perform casing milling and salvaging integrated operations; The lower end of the lower connecting part is provided with a second external thread section for connecting the lower drilling tool.

2. The integrated milling and salvaging joint according to claim 1, It is characterized in that The first external thread segment includes a double-stage external thread segment.

3. The integrated milling and salvaging joint according to claim 1, It is characterized in that A high-torque-resistance buckle is arranged on the outer circumference of the reducing portion to speed up the connection with the drilling tool.

4. The integrated milling and salvaging joint according to claim 1, It is characterized in that The modular joint further comprises an inner flow channel arranged at the central axis thereof, wherein the inner flow channel runs through the upper connecting portion, the reducing portion and the lower connecting portion.

5. The integrated milling and salvaging joint according to claim 1, It is characterized in that The first internal thread section and the second external thread section are connected to the drilling tool using the same buckle type.

6. A downhole tool integrating milling and fishing, It is characterized in that The downhole tool comprises the modular joint according to any one of claims 1 to 5.

7. The integrated downhole tool for milling and fishing according to claim 6, It is characterized in that The downhole tool further comprises a milled pipe with a collar, wherein the milled pipe with a collar comprises a collar and a pipe body, and the collar is arranged on the upper part of the milled pipe with a collar.

8. The integrated downhole tool for milling and fishing according to claim 7, It is characterized in that A through hole is arranged at the central axis of the sleeve milling pipe with a coupling, which can circulate working fluid and accommodate the fish that are milled out.

9. The integrated downhole tool for milling and fishing according to claim 7, It is characterized in that The upper end and the lower end of the pipe body are respectively provided with a second internal thread section and a third external thread section, and the second internal thread section cooperates with the first external thread section to connect the milled pipe with the coupling sleeve with the reducer.

10. The integrated downhole tool for milling and fishing according to claim 9, It is characterized in that The second internal thread segment and the third external thread segment include a double-stage internal thread segment and a double-stage external thread segment, respectively.

Images