Well falling prevention device for MWD matching joint

Abstract

The utility model provides a well falling prevention device for an MWD matching joint, which comprises a metal hose A and is characterized in that the top of the metal hose A is fixedly connected with a connecting pipe, the outer side of the top of the connecting pipe is fixedly connected with a handle, the inner side of the top of the connecting pipe is fixedly connected with a spring, and the bottom of the metal hose A is fixedly connected with a positioning pipe. A grabbing structure is arranged in the metal hose A, the connecting pipe, the spring and the positioning pipe, the grabbing structure comprises a metal hose B, a fixing piece and a clamping jaw, the metal hose B is connected with the clamping jaw through the fixing piece, the top of the metal hose B is fixedly connected with a connecting piece, and the top of the connecting piece is fixedly connected with a pressing wafer; by arranging the two metal hoses, the clamping jaw can be driven to reach any position, and the metal hoses can be bent at will, so that the metal hoses can reach the falling position of the MWD matched connector no matter a shaft is straight, inclined or bent, limitation by the shape of the shaft is avoided, and the application range is widened.

Description

Technical Field

[0001] This utility model relates to the field of oil drilling tool technology, and in particular to an anti-fall-in device for automotive MWD mating joints. Background Technology

[0002] MWD (Measurement While Drilling) instruments are primarily used in the oil drilling field. The MWD instrument mainly consists of the following modules: Central Control Unit (TCM): This is the main control system for the MWD downhole instrument, composed of four circuit modules: a pulse drive board, a capacitor board, a vibration monitor, and a microprocessor board; Inertial Navigation System (INS): Uses accelerometers and gyroscopes to measure the displacement and attitude changes of the drilling tool, helping to determine the tool's position and orientation; Measurement Sensor Unit: Uses various sensors, such as density sensors, magnetic sensors, and acoustic sensors, to measure downhole physical and chemical parameters, including formation density, magnetism, and acoustic velocity; Displacement Sensor Unit: Measures the distance between the downhole tool and the wellbore wall to help determine the wellbore shape and orientation; Communication Module: Transmits measured data to the surface system, which can be done via wired or wireless means.

[0003] The working principle of the MWD (Measuring While Drilling) instrument is to measure the displacement and attitude changes of the drilling tool through an inertial navigation system, measure the physical and chemical parameters downhole through a measurement sensor unit, determine the wellbore morphology and orientation through a displacement sensor unit, and finally transmit the data to the surface system for analysis and decision-making through a communication module.

[0004] Patent number CN206429216U relates to oil drilling tools, specifically a MWD (Mechanical, Explosive, and Dry) anti-fall-in-well device. It is used in conjunction with the drill string to retrieve the MWD instrument and includes a retrieval head, a lifting rod, a suspension component, and a support. One end of the lifting rod is connected to the retrieval head, and the other end is connected to the suspension component. The lower end of the retrieval head is equipped with multiple spring clips for gripping the MWD instrument. The suspension component mates with the conical surface of the support, which is mounted on the drill string. When the MWD connector breaks, the retrieval head can be dropped into the wellhead. During tripping, the support mounted on the drill string brings the MWD instrument to the surface, preventing the instrument from falling into the well.

[0005] However, this patented technology still has the following problems: During exploration and mining, due to the limitations of the geological environment, straight well shafts are not widely applicable. Sometimes, horizontal or inclined well drilling is used for mining. The anti-fall-in device of this patented technology is more suitable for straight well shafts. When drilling at an angle, if the drill bit falls, the device cannot bend and therefore cannot accurately grab the drill bit. Therefore, the applicability of this device is limited. Utility Model Content

[0006] In view of the above technical problems, this utility model provides an anti-fall-in-well device for MWD mating joints with a wider range of applications.

[0007] This utility model provides an anti-fall-in device for MWD connectors, including a metal hose A. The metal hose A is characterized by a connecting pipe fixedly connected to its top, a handle fixedly connected to the outer side of the top of the connecting pipe, a spring fixedly connected to the inner side of the top of the connecting pipe, and a positioning pipe fixedly connected to the bottom of the metal hose A. A gripping structure is provided inside the metal hose A, the connecting pipe, the spring, and the positioning pipe. The gripping structure includes a metal hose B, a fixing plate, and a clamp. The metal hose B is connected to the clamp via the fixing plate. A connecting piece is fixedly connected to the top of the metal hose B, and a pressing disc is fixedly connected to the top of the connecting piece.

[0008] The pressing disc is located on the top of the spring, and pressing the pressing disc causes the spring to contract.

[0009] The diameter of the metal hose B is smaller than that of the metal hose A. The metal hose B is disposed inside the metal hose A and is in contact with the metal hose A. The metal hose B can slide on the inner wall of the metal hose A.

[0010] The gripper is composed of multiple gripping pieces. Each gripping piece has a linear connecting part B on its upper side and a bending part on its lower side. The bending part is connected to the linear connecting part A, and the linear connecting part A is connected to the gripping part.

[0011] Each of the clips is a metal spring clip.

[0012] The beneficial effects of this utility model are as follows: This utility model is an anti-fall-in device for MWD mating joints. By setting two metal hoses, it can drive the clamp to any position. Because the metal hoses can be bent arbitrarily, it can reach the fall position of the MWD mating joint regardless of whether the well shaft is straight, inclined, or curved, and is not limited by the shape of the well shaft, thus increasing the scope of application. The clamp can move the connecting piece and metal hose B downward by pressing the pressing disc. The spring is compressed, and at the same time, the clamp expands out from the positioning tube. After the MWD mating joint is firmly clamped, the device can be lifted out. The operation is simple and convenient, without cumbersome operations, saving working time and improving work efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the gripping structure of this utility model;

[0015] Figure 3 This is a bottom view of the present invention;

[0016] Figure 4 This is a schematic diagram of the gripper popping out when the present invention is in use;

[0017] Figure 5 This is a bottom view of the structure of the gripper popping out when the present invention is in use;

[0018] Figure 6 This is a schematic diagram of the structure of the clip of this utility model.

[0019] Reference numerals: 1-Metal hose A; 2-Connecting tube; 3-Handle; 4-Spring; 5-Positioning tube; 6-Gripping structure; 61-Metal hose B; 62-Clamping plate; 63-Connector; 64-Pressing disc; 65-Fixing disc; 621-Bending part; 622-Gripping part; 624-Linear connection part A; 623-Linear connection part B. Detailed Implementation

[0020] Example 1

[0021] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings.

[0022] As shown in the figure, this utility model provides an anti-fall-in-well device for MWD mating connectors, including a metal hose A1. The top of the metal hose A1 is fixedly connected to a connecting pipe 2, the outer side of the top of the connecting pipe 2 is fixedly connected to a handle 3, the inner side of the top of the connecting pipe 2 is fixedly connected to a spring 4, the bottom of the metal hose A1 is fixedly connected to a positioning pipe 5, and a gripping structure 6 is provided inside the metal hose A1, the connecting pipe 2, the spring 4 and the positioning pipe 5. The gripping structure includes a metal hose B61, a fixing plate 65 and a clamp. The metal hose B61 is connected to the clamp through the fixing plate 65, the top of the metal hose B61 is fixedly connected to a connector 63, and the top of the connector 63 is fixedly connected to a pressing disc 64.

[0023] The pressing disc 64 is located on the top of the spring 4. Pressing the pressing disc 64 causes the spring 4 to contract.

[0024] The diameter of the metal hose B61 is smaller than that of the metal hose A1. The metal hose B61 is located inside the metal hose A1 and is in contact with the metal hose A1. The metal hose B61 can slide on the inner wall of the metal hose A1.

[0025] The gripper is composed of multiple gripping pieces 62. Each gripping piece 62 has a linear connecting part B623 on its upper side and a bending part 621 on its lower side. The bending part 621 is connected to the linear connecting part A624, and the linear connecting part A624 is connected to the gripping part 622.

[0026] Each clip has 62 metal clips.

[0027] Example 2

[0028] When using this invention: First, observe whether the pump pressure drops during drilling. If so, it can be determined that the lower MWD connector is broken. At this time, do not lift the drill string. Instead, put the device into the wellhead. Its metal hose A1 and the internal metal hose B61 can change with the wellbore. When the positioning tube 5 contacts the MWD instrument, press the pressing disc 64. The spring 4 retracts, and the jaws push out from the positioning tube. Its bent part 621 slides out along the bottom inner wall of the positioning tube 5. At this time, the jaws expand and clamp the MWD instrument. Then, lift the pressing disc 64, which drives the metal hose 61 to move upward inside the metal hose A1. This causes the jaws to retract, clamping the MWD instrument and lifting it out together, effectively avoiding the accident of the MWD instrument falling into the well.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. The various components mentioned in this utility model are common technologies in the existing field. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A fall-preventing device for a MWD mating sub, comprising a metal hose A, characterized in that The metal hose A is fixedly connected with a connecting pipe at the top, a handle is fixedly connected with the outer side of the connecting pipe at the top, a spring is fixedly connected with the inner side of the connecting pipe at the top, a positioning pipe is fixedly connected with the metal hose A at the bottom, a grabbing structure is arranged inside the metal hose A, the connecting pipe, the spring and the positioning pipe, the grabbing structure comprises a metal hose B, a fixed sheet and a clamping jaw, the metal hose B is connected with the clamping jaw through the fixed sheet, a connecting piece is fixedly connected with the metal hose B at the top, and a pressing disc is fixedly connected with the connecting piece at the top.

2. The fall-prevention device for use with a MWD tool joint of claim 1, wherein The pressing disc is arranged at the top of the spring, and the spring is retracted by pressing the pressing disc.

3. The fall-prevention device for use with a MWD tool joint of claim 1, wherein The pipe diameter of the metal hose B is smaller than that of the metal hose A, the metal hose B is arranged inside the metal hose A and is in contact with the metal hose A, and the metal hose B can slide on the inner wall of the metal hose A.

4. The fall-prevention device for use with a MWD tool joint of claim 1, wherein Each clamping piece is provided with a linear connecting part B at the upper side, a bending part is arranged at the lower side of the linear connecting part B, the bending part is connected with a linear connecting part A, and the linear connecting part A is connected with a grabbing part.

5. The fall-prevention device for use with a MWD tool joint of claim 4, wherein The clamping piece is a metal spring piece.

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