Device for sleeving and grinding accident drilling tool

Abstract

The utility model discloses a device for sleeving and grinding an accident drilling tool, and belongs to the technical field of well drilling. The device comprises a sleeve milling barrel; the female buckle joint is mounted at the top in the sleeve milling barrel; the annular grinding sheet is positioned right below the female buckle joint in the sleeve grinding barrel; wherein the female buckle connector is connected with the annular abrasive disc through the connecting cylinder; the female buckle connector and the connecting cylinder are provided with a fishing channel for a fishing tool to penetrate through. According to the utility model, the milling shoe and the sleeve are combined into a whole, and fracture grinding and fracture connection of the sleeve are carried out at one time, so that the accident handling speed is improved, and the accident drilling tool can be prevented from being blocked by settled sand after middle interruption.

Description

Technical Field

[0001] This utility model relates to the field of drilling technology, and specifically to a device for drilling tools that experience casing wear accidents. Background Technology

[0002] During drilling, if the stress on the drill bit exceeds its breaking stress and it breaks inside the hole, it is called a drill bit breakage accident. If the drill bit thread connection is not tight or the resistance inside the hole is too great, suddenly shutting down the drill bit will cause it to return and become detached. In addition, errors in raising and lowering the drill bit can lead to the drill bit running away, which is called a drill bit detachment accident.

[0003] If the broken drill bit is not severely misaligned and the resistance inside the hole is low, it is relatively easy to handle. Generally, it is only necessary to determine the location and wear condition of the broken drill bit and use an appropriate tap to retrieve it. Based on the condition of the retrieved drill bit, the situation inside the hole can be determined. If the broken end of the drill bit is still intact and there is no cracking or misalignment, it can be retrieved using male and female taps. If the threads of the detached drill bit are still intact, it can be retrieved by lowering a suitable connector into the hole.

[0004] If the broken edges of the drill bit are uneven, cracked, or skewed, tools such as grinding shoes are needed to grind and repair the broken edges to facilitate subsequent retrieval using tools such as the drill bit.

[0005] If the drilling operation is a horizontal directional well, and the directional instrument is inside the drill string, after the fracture surface is smoothed and before the drill string is retrieved by running the male conical drill bit, the directional instrument must first be retrieved from the well. Otherwise, the violent shock generated during the retrieval process will damage the instrument. Generally, the fracture surface is smoothed by running a grinding shoe first, the grinding shoe is removed after tripping the drill string, and then the casing is run to connect with the fracture surface of the faulty drill string. The sucker rod is then lowered into the directional instrument position through the inside of the drill pipe to retrieve the instrument. This commonly used method has certain drawbacks. First, after smoothing the fracture surface with the grinding shoe, the drill string needs to be tripped again. When running the casing again to connect with the faulty drill string, misalignment may occur, or sand may enter the faulty drill string and block it. Utility Model Content

[0006] The purpose of this utility model is to provide a device for grinding accident drill bits, which combines the grinding shoe and the sleeve into one, and grinds the broken edge and the sleeve connection broken edge in one go, thereby improving the speed of handling accidents and preventing sand from clogging the accident drill bit after the intermediate interruption.

[0007] To solve the above-mentioned technical problems, this utility model provides a device for preventing drill bit accidents caused by casing wear, comprising:

[0008] include:

[0009] Grinding cylinder body;

[0010] The female threaded connector is installed at the top of the grinding sleeve body;

[0011] The annular grinding disc is located directly below the female threaded joint inside the grinding cylinder.

[0012] in:

[0013] The female connector is connected to the annular grinding disc via a connecting cylinder;

[0014] The female connector and the connecting cylinder are provided with a retrieval channel for the retrieval tool to pass through.

[0015] Preferably, the female buckle is a hollow frustum shape;

[0016] The top of the female connector is fixedly connected to the top of the sleeve cylinder body;

[0017] The bottom of the female buckle is connected to the top of the connecting cylinder and they are interconnected.

[0018] Preferably, the annular grinding disc is fitted onto the bottom of the side wall of the connecting cylinder.

[0019] Preferably, the annular grinding disc abuts against the inner wall of the grinding cylinder.

[0020] Preferably, the annular grinding disc is an alloy grinding disc.

[0021] Preferably, the inner side of the female connector is provided with an internal thread for connecting with the drill pipe.

[0022] Preferably, the two side walls of the connecting cylinder are fixedly connected to the inner wall of the grinding cylinder by a number of connecting rods.

[0023] Preferably, the inner diameter of the grinding sleeve is larger than the outer diameter of the drill bit in the accident;

[0024] The outer diameter of the connecting cylinder is smaller than the inner diameter of the drill bit in the accident.

[0025] Preferably, both the female threaded connector and the annular grinding disc are located in the upper half of the inner cavity of the grinding cylinder.

[0026] Preferably, the bottom of the grinding cylinder is flared.

[0027] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0028] This utility model combines the grinding shoe and the sleeve into one, and the grinding of the broken end and the sleeve connection break are carried out in one go, thereby improving the speed of handling accidents and preventing sand from clogging the drill bit after the interruption. Attached Figure Description

[0029] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0030] Figure 1 This is a schematic diagram of the structure of the device for the drill bit that causes a grinding accident according to this utility model;

[0031] Figure 2 This is a top view of the device for the drill bit that causes a grinding accident according to this utility model;

[0032] In the picture:

[0033] 1-Grinding cylinder body; 2-Female threaded connector; 3-Connecting cylinder; 4-Annular grinding disc; 5-Emergency drilling tool; 6-Connecting rod; 7-Salvage channel; 8-Directional instrument; 9-Salvage tool. Detailed Implementation

[0034] Many specific details are set forth in the following description to provide a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0035] The terminology used in one or more embodiments of this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the one or more embodiments of this specification. The singular forms “a,” “described,” and “the” as used in one or more embodiments of this specification and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in one or more embodiments of this specification refers to and includes any or all possible combinations of one or more associated listed items.

[0036] It should be understood that although the terms first, second, etc., may be used to describe various information in one or more embodiments of this specification, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first may also be referred to as second without departing from the scope of one or more embodiments of this specification, and similarly, second may also be referred to as first. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to a determination."

[0037] The present invention will now be described in further detail with reference to the accompanying drawings:

[0038] This utility model provides a device for a drill bit that experiences a grinding accident, comprising:

[0039] Grinding cylinder body 1;

[0040] Female threaded connector 2 is installed at the top inside the milling cylinder 1;

[0041] The annular grinding disc 4 is located directly below the female threaded joint 2 inside the grinding cylinder 1;

[0042] in:

[0043] The female connector 2 is connected to the annular grinding disc 4 via the connecting cylinder 3;

[0044] The female connector 2 and the connecting cylinder 3 are provided with a retrieval channel 7 for the retrieval tool 9 to pass through.

[0045] Preferably, the female snap-fit ​​connector 2 is a hollow frustum shape;

[0046] The top of the female connector 2 is fixedly connected to the top of the inner side of the grinding cylinder 1;

[0047] The bottom of the female buckle 2 is connected to the top of the connecting cylinder 3 and they are interconnected.

[0048] Preferably, the annular grinding disc 4 is sleeved on the bottom of the side wall of the connecting cylinder 3.

[0049] Preferably, the annular grinding disc 4 is in contact with the inner wall of the grinding cylinder 1.

[0050] Preferably, the annular grinding disc 4 is an alloy grinding disc.

[0051] Preferably, the inner side of the female connector 2 is provided with an internal thread for connecting with the drill rod.

[0052] Preferably, the two side walls of the connecting cylinder 3 are fixedly connected to the inner wall of the grinding cylinder 1 by a number of connecting rods 6.

[0053] Preferably, the inner diameter of the grinding sleeve 1 is larger than the outer diameter of the emergency drill bit 5;

[0054] The outer diameter of the connecting cylinder 3 is smaller than the inner diameter of the accident drill bit 5.

[0055] Preferably, the female connector 2 and the annular grinding disc 4 are both located in the upper half of the inner cavity of the grinding cylinder 1.

[0056] Preferably, the bottom of the grinding cylinder 1 is flared.

[0057] If the drill string breaks during drilling, the broken end of the drill string 5 needs to be ground and repaired. After repairing the broken end, without stopping the drill string, the drill string 5 is directly connected to the drill string 5 through the sleeve of this utility model, and the retrieval rope such as the oil pipe is used to retrieve the directional instrument 8 and other objects left in the drill string 5.

[0058] To better illustrate the technical effects of this utility model, the present utility model provides the following specific embodiments to explain the above technical process:

[0059] Example 1: A device for preventing drill string accidents, such as... Figures 1-2 As shown, it includes:

[0060] I. Grinding cylinder body 1:

[0061] Its function is firstly to mill the emergency drill string 5, which acts as an intermediate bridge to connect the normal drill pipe and the emergency drill string 5 smoothly, so that the oil pipe used for retrieval can smoothly enter the emergency drill string 5. That is, the retrieval tool 9 goes through the retrieval channel 7 and goes deep into the emergency drill string 5 to retrieve the directional instrument 8 out of the well.

[0062] Its second function is to serve as a ring-shaped grinding disc 4 for grinding the broken surface inside the main body. The grinding cylinder 1 combines milling and grinding into one.

[0063] The casing 1 is generally made of J55 or N80 material, with a wall thickness of about 10mm, depending on the diameter of the wellbore and the diameter of the emergency drill tool 5. In order to facilitate the connection, the length is controlled within 0.5m. A female threaded connector 2 is installed at the top inside for connection with the normal drill pipe. An annular grinding disc 4 is installed inside for grinding the broken end of the emergency drill tool 5. The inner diameter of the casing 1 is slightly larger than the outer diameter of the emergency drill tool 5, and the bottom is fitted onto the emergency drill tool 5.

[0064] 2. Female fastener 2:

[0065] The female threaded connector 2 is installed at the top inside the grinding sleeve 1. Its function is to connect the male thread of the drill pipe at the top and to weld the annular grinding disc 4 (T313 or T107YG-8 cemented carbide) to the bottom through the connecting sleeve 3. In order to ensure a firm installation, a hole is drilled in the grinding sleeve 1 and reinforced by welding with the connecting rod 6. In order to facilitate the insertion into the emergency drill tool 5, the diameter of the bottom of the female threaded connector 2 and the diameter of the connecting sleeve 3 are slightly smaller than the diameter of the emergency drill tool 5.

[0066] Example:

[0067] first step:

[0068] After a drill string breakage accident occurs, the drill string 5 is pulled out and the fracture shape is inspected. If the fracture is rolled inward, the bottom opening of the grinding sleeve 1 can be straight. If the fracture is rolled outward, the bottom opening of the grinding sleeve 1 is machined into a trumpet shape.

[0069] After inspecting the fracture, install the device of this utility model for grinding the accident drill bit on the upper and lower parts of the drill rod at the fish head position (the fracture position of the accident drill bit 5). Start the drilling machine to grind the fracture, grinding down about 10-20cm. After the grinding cylinder completely covers the accident drill bit 5, circulate and discharge the mud, and circulate the ground iron filings and rock powder out of the well.

[0070] Step 2: Lower the sucker rod and other retrieval tools 9 through the inside of the drill string to the position of the directional instrument 8, retrieve it from the well, then start the drilling rig to grind the broken part about 30cm, pull out the drill string and remove the device, and lower the male cone to retrieve the damaged drill string 5.

[0071] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A device for a drill bit that experiences a grinding accident, characterized in that, include: Grinding cylinder body (1); The female threaded connector (2) is installed inside the grinding cylinder (1); The annular grinding disc (4) is located directly below the female threaded joint (2) inside the grinding cylinder (1); in: The female threaded connector (2) is connected to the annular grinding disc (4) via the connecting cylinder (3); The female connector (2) and the connecting cylinder (3) are provided with a retrieval channel (7) for the retrieval tool (9) to pass through.

2. The device for preventing drill string accidents according to claim 1, characterized in that: The female connector (2) is a hollow frustum shape; The top of the female connector (2) is fixedly connected to the top of the inner side of the grinding cylinder (1); The bottom of the female buckle (2) is connected to the top of the connecting cylinder (3) and they communicate with each other.

3. The apparatus for preventing drill string accidents according to claim 2, characterized in that: The annular grinding disc (4) is fitted onto the bottom of the side wall of the connecting cylinder (3).

4. The device for repairing a worn-out drill bit according to claim 3, characterized in that: The annular grinding disc (4) is in contact with the inner wall of the grinding cylinder (1) around its perimeter.

5. The device for repairing a worn-out drill bit according to claim 4, characterized in that: The annular grinding disc (4) is an alloy grinding disc.

6. The apparatus for repairing a worn-out drill bit according to claim 5, characterized in that: The inner side of the female threaded connector (2) is provided with an internal thread for connecting with the drill rod.

7. The apparatus for preventing drill string accidents according to claim 6, characterized in that: The two side walls of the connecting cylinder (3) are fixedly connected to the inner wall of the grinding cylinder (1) by several connecting rods (6).

8. The apparatus for repairing a worn-out drill bit according to claim 7, characterized in that: The inner diameter of the grinding cylinder (1) is larger than the outer diameter of the accident drill bit (5); The outer diameter of the connecting cylinder (3) is smaller than the inner diameter of the accident drill bit (5).

9. The apparatus for preventing drill string accidents according to claim 8, characterized in that: The female connector (2) and the annular grinding disc (4) are both located in the upper half of the inner cavity of the grinding cylinder (1).

10. The apparatus for preventing drill string accidents according to claim 9, characterized in that: The bottom of the grinding cylinder (1) is flared.

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