Grinding and milling tool for horn mouth of tie-back cylinder

Abstract

The utility model discloses a horn mouth milling tool of tie-back cylinder, including cutter bar body, the cutter bar body is provided with first guide portion, second guide portion and third guide portion, the diameter of the first guide portion, second guide portion and third guide portion gradually increases, the second guide portion and the third guide portion are provided with a plurality of chip groove that are through and evenly distributed along the circumferential direction. A plurality of mounting grooves are formed in the third guide part, the adjacent mounting grooves are communicated with the chip groove, and mounting blocks and milling blocks mounted on the mounting blocks are arranged in the mounting grooves; a centralizing groove located below the chip groove is formed in the second guide part, and a centralizing block is installed in the centralizing groove; the current situation that in the prior art, a grinding and milling head is adopted for conducting welding machining on the conical face machining portion of a horn mouth of a tie-back cylinder, and the whole grinding and milling head needs to be replaced after abrasion is achieved is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of downhole back connection cylinder milling, and particularly relates to a back connection cylinder horn mouth milling tool. BACKGROUND

[0002] With the deepening of current oil and gas exploration, more and more deep wells and ultra-deep wells, tail pipe suspension, back connection cementing technology has been a deep well / ultra-deep well standard process, such as Tarim oilfield, Sichuan basin and other deep blocks due to well depth over 7000 meters, well temperature over 180 DEG C, tail pipe suspension cementing has become the core cementing mode, covering more than 90% of deep well operation. The advantage of cementing mode is to reduce the weight of casing string by 30%-50%, reduce the wellhead load pressure; at the same time, it is suitable for complex well type, such as Daqing oilfield in Songshen 20HC well (well inclination 95 DEG) and other large displacement horizontal wells, through the combination of floating hanger and tail pipe hanger, the cementing problem caused by well trajectory uplink is successfully solved.

[0003] In the suspension cementing process, the back connection process of the back connection cylinder needs to use the milling tool to process the horn mouth cone surface of the back connection cylinder, which can remove some impurities on the surface, such as mud sediment, cement slurry solidification during cementing at the horn mouth position, etc.; at the same time, the horn mouth cone surface is processed, and the horn mouth cone surface may be damaged by the drill due to the cement plug on the drill; and the burr and irregular metal surface caused by the damage may damage the rubber sealing element of the back connection insertion pipe during back connection insertion, causing the failure of back connection sealing.

[0004] The conventional milling tool currently used is a milling head, and the part of the horn mouth cone surface of the back connection cylinder is generally welded and built up to form an inclined surface, and after repeated use for several times, the cone surface needs to be rebuilt, and welding cannot be performed at the construction site, so the entire milling head can only be disassembled and replaced for welding processing, which consumes a long time and affects the efficiency of the cementing process. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a back connection cylinder horn mouth milling tool, solving the problem that the milling head used in the prior art adopts a welding processing method for the part of the horn mouth cone surface of the back connection cylinder, and the entire milling head needs to be replaced after wear.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] A kind of milling tool of trumpet mouth of back connection cylinder, including cutter rod body, the cutter rod body is equipped with first guide portion, second guide portion and third guide portion of gradually increasing diameter in turn, multiple chip removal grooves are uniformly distributed on the second guide portion and the third guide portion and are passed through and are opened, multiple installation grooves are opened in the third guide portion, adjacent installation groove is communicated with the chip removal groove, installation block is equipped in the installation groove and milling block is installed on the installation block;The second guide portion is opened with righting groove below the chip removal groove, and the righting groove is installed with righting block.

[0008] Preferably, multiple mounting holes are opened in the third guide portion along the circumference, and detection screws are installed in the mounting holes.

[0009] Preferably, T-shaped groove is opened in the installation block, and T-shaped part matched with the T-shaped groove is arranged on the milling block;Step groove exposing the chip-removing part of the milling block is arranged on the installation block;Fastening holes are spaced apart on the installation block.

[0010] Preferably, the cutter rod body is provided with a clamping portion fixed at the end of the third guide portion, and the clamping portion is provided with a clamping groove, and the end of the clamping groove away from the third guide portion is provided with a rounded transition structure.

[0011] Preferably, a tapered portion is fixed to the end of the first guide portion.

[0012] Preferably, the cutter rod body is provided with an axial through hole.

[0013] Preferably, the material of the milling block is alloy, and the material of the righting block is nylon.

[0014] Beneficial effects:

[0015] The installation groove is opened on the third guide portion of the cutter rod body, the milling block is fixedly installed by the installation block, when the trumpet mouth of the back connection cylinder is processed, the whole cutter rod body rotates at high speed with the milling block for processing, at the same time, the righting groove is opened on the second guide portion and the righting block is installed, so that the second guide portion can extend into the back connection cylinder and play a righting role, to ensure that the trumpet mouth maintains coaxiality after conical surface processing;Therefore, the milling block can be directly replaced after wear, without disassembling the whole cutter rod body, and the milling block and the righting block can be replaced according to the processing size of the back connection cylinder, to improve the efficiency in the milling process, and the mechanism driving the cutter rod body does not need to disassemble the cutter rod body again, to reduce the operation difficulty. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is the structural schematic diagram of the utility model;

[0017] Fig. 2 Figure 2 is a structural schematic view of the mounting block in the embodiment of the present application;

[0018] Fig. 3 Figure 3 is a structural schematic view of the milling block in the embodiment of the present application;

[0019] In Figs. 1-3 In the drawings, the correspondence between the component names or lines and the drawing numbers is as follows:

[0020] Cutter rod body 1, first guide part 2, second guide part 3, third guide part 4, chip removal groove 5, mounting groove 6, mounting block 7, T-shaped groove 70, stepped groove 71, fastening hole 72, milling block 8, T-shaped part 80, righting groove 9, righting block 10, mounting hole 11, detection screw 12, clamping part 13, clamping groove 14, rounded transition structure 15, conical part 16, through hole 17. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application.

[0022] Referring to Figs. 1-3 The embodiment of the present application proposes a horn mouth milling tool for a back connection cylinder, which comprises a cutter rod body 1. The cutter rod body 1 is an integral structure, is used for being mounted on a milling device and extending into a well to perform a rotating action, and is provided with a first guide part 2, a second guide part 3 and a third guide part 4 with diameters increasing in sequence. A plurality of chip removal grooves 5 are uniformly distributed in a circumferential direction and pass through the second guide part 3 and the third guide part 4. A plurality of mounting grooves 6 are provided in the third guide part 4. Adjacent mounting grooves 6 are in communication with the chip removal grooves 5. A mounting block 7 and a milling block 8 mounted on the mounting block 7 are arranged in the mounting grooves 6. A righting groove 9 located below the chip removal grooves 5 is provided in the second guide part 3. A righting block 10 is mounted in the righting groove 9. The first guide part 2 does not serve as a positioning function, but can enter the back connection cylinder to form a preliminary guide during the entire lowering process of the cutter rod body 1. During the continuous movement process, the second guide part 3 is positioned and matched with the back connection cylinder, especially during the rotating process, the cutter rod body 1 is kept coaxial with the back connection cylinder. The thickness of the righting block 10 can be replaced according to the size of the inner wall of the back connection cylinder, so that the righting block 10 uniformly contacts the inner wall of the back connection cylinder to rotate during the rotation of the cutter rod body 1, and the reference positioning is satisfied. The milling block 8 processes a conical surface of the horn mouth of the back connection cylinder. After the milling block 8 is worn, the milling block 8 can be replaced by disassembling the mounting block 7, without disassembling the entire cutter rod body 1.

[0023] Adopt the detachable structure design of the milling block 8 and the righting block 10, the tool rod body 1 can be adapted to the processing of the return tube horn mouth in a certain inner diameter range, and the application range is improved.

[0024] Specifically, a plurality of mounting holes 11 are arranged on the third guide part 4 in the circumferential direction, and detection screws 12 are mounted in the mounting holes 11.

[0025] Specifically, a T-shaped groove 70 is arranged on the mounting block 7, and a T-shaped part 80 matched with the T-shaped groove 70 is arranged on the milling block 8.

[0026] Specifically, a clamping part 13 is arranged at the end of the third guide part 4 on the tool rod body 1, and a clamping groove 14 is arranged on the clamping part 13.

[0027] Meanwhile, a tapered part 16 is fixed at the end of the first guide part 2, and the outer diameter of the tapered part 16 is smaller than that of the first guide part 2.

[0028] Specifically, an axial through hole 17 is arranged on the tool rod body 1, which facilitates the flow of residual liquid in the well and does not affect the processing of the horn mouth of the return tube.

[0029] In order to improve the tool life, the material of the milling block 8 is alloy, such as tungsten steel alloy, and the material of the righting block 10 is nylon.

[0030] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated; can be mechanical connection, also can be electrical connection; can be direct connection, also can through intermediate medium indirectly connect, can be two element internal communication or two element's mutual action relationship. For ordinary skilled person in the art, can understand the concrete meaning of above-mentioned terms in the utility model according to specific circumstances.

[0031] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "internal", "external" and so on is based on the orientation or position relationship shown in the drawing, or is the orientation or position relationship of the utility model product when using, just is for the convenience of describing the utility model and simplifying the description, and is not indicated or implied that the indicated device or element must have a particular orientation, is constructed and operated with a particular orientation, therefore can not be understood as the limitation of the utility model. In addition, the terms "first", "second" and so on are only used for distinguishing description, and can not be understood as indicating or implying relative importance.

[0032] For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the utility model is defined by the appended claims rather than the above description, therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any figure reference in the claims should not be regarded as limiting the involved claims.

Claims

1. A mill tool for milling a bell mouth of a back- contact barrel, characterized in that: The utility model provides a cutting tool rod body (1) which is provided with a first guide part (2), a second guide part (3) and a third guide part (4) with increasing diameters in sequence, a plurality of chip removal grooves (5) are uniformly distributed in the circumferential direction and pass through the second guide part (3) and the third guide part (4), a plurality of mounting grooves (6) are formed in the third guide part (4), adjacent mounting grooves (6) are communicated with the chip removal grooves (5), mounting blocks (7) are arranged in the mounting grooves (6), and milling blocks (8) are arranged on the mounting blocks (7). A righting groove (9) is formed in the second guide part (3) below the chip removal grooves (5), and a righting block (10) is arranged in the righting groove (9).

2. A mill tool for milling the bell mouth of a backshot liner as defined in claim 1, wherein: A plurality of mounting holes (11) are formed in the circumferential direction of the third guide part (4), and detection screws (12) are arranged in the mounting holes (11).

3. A mill tool for milling a flared mouth of a back-reaming shoe according to claim 2, wherein: A T-shaped groove (70) is formed in the mounting block (7), and a T-shaped part (80) of the milling block (8) is matched with the T-shaped groove (70). A stepped groove (71) is formed in the mounting block (7) to expose a chip removal part of the milling block (8). Fastening holes (72) are formed in the mounting block (7) at intervals.

4. A mill tool for milling a flared mouth of a back-reamer according to claim 3, characterized in that: A clamping part (13) is arranged at the end of the third guide part (4) of the cutting tool rod body (1), a clamping groove (14) is formed in the clamping part (13), and a rounded transition structure (15) is arranged at the end of the clamping groove (14) away from the third guide part (4).

5. A mill tool for milling the mouth of a backshot cone as defined in claim 4, wherein: A tapered part (16) is arranged at the end of the first guide part (2).

6. A mill tool for milling a flared mouth of a liner hanger according to any one of claims 1-5, wherein: A through hole (17) is formed in the cutting tool rod body (1) and passes through in the axial direction.

7. A mill tool for milling a flared mouth of a back-reamer according to claim 6, characterized in that: The material of the milling block (8) is an alloy, and the material of the righting block (10) is nylon.

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