Key falling prevention structure of seat key type wireless inclinometer while drilling

Abstract

The utility model discloses a seat key type wireless inclinometer anti-drop key structure, which is arranged between a main valve head component and a circulating sleeve and comprises a guide block and a directional key, the guide block is fixedly embedded in a directional key slot formed in the circulating sleeve, and the directional key is positioned at the lower end of the guide block and is elastically and slidably connected with the guide block; the shifting piece is arranged in a groove formed in one side of the directional key, the shifting piece is eccentrically connected with a slotted set screw with a flat end, and the slotted set screw with the flat end is in threaded connection with the circulating sleeve; the valve further comprises a locking piece, the locking piece is fixed in a groove formed in one side of the main valve head assembly, a sawtooth-shaped clamping groove is formed in one side of the locking piece, and the sawtooth-shaped clamping groove is matched with and opposite to a locking tongue arranged at the lower end of the directional key in shape. Through vertical movement of the directional key, the directional key is locked in the locking piece to achieve key locking of the main valve head assembly and the circulating sleeve, the directional key is poked through the poking piece to be lifted upwards for unlocking, and the self-locking and unlocking type check valve not only facilitates self-locking, but also facilitates unlocking.

Description

Technical Field

[0001] The utility model relates to the technical field of petroleum exploration and drilling, in particular to an anti-key-off structure for a seat-key type wireless while-drilling inclinometer which is convenient for key-off. Background Art

[0002] The key-type MWD wireless inclinometer often has the problem of key-off in the well, especially in highly deviated wells, horizontal wells or when the drilling speed is too fast. Once the key is off, the pulse generator signal cannot be transmitted to the ground equipment through the drilling fluid, and the downhole data cannot be obtained. The key must be re-seated or the drill must be lifted, which prolongs the drilling cycle and increases the drilling cost. Therefore, it is necessary to design an anti-key-off structure.

[0003] At present, the anti-keying function structure has a ball-type, but it is difficult to seat the key during use, and the anti-keying performance is unreliable; there are also anti-keying structures, which are not accurately positioned in the radial direction and are easy to rotate in the radial direction, which can easily affect the tool surface accuracy. Although the existing card sleeve anti-keying structure has a good anti-keying effect, it is sometimes difficult to key out. If you want to remove the instrument from the circulation sleeve, you often need to use violent removal, which is not only unsafe but also affects the service life of the anti-keying structure. Utility Model Content

[0004] In order to solve the above-mentioned problem, the utility model provides a seat-key type wireless downhole inclinometer anti-keying structure, which not only prevents keying when in use, but also facilitates key removal when not in use, thereby overcoming the shortcomings of the above-mentioned prior art and effectively solving the problem of keying difficulty of the sleeve type anti-keying structure.

[0005] The technical solution adopted by the utility model is as follows: a seat key type wireless drilling inclinometer anti-keying structure, which is arranged between the main valve head assembly and the circulation sleeve, and includes a guide block and a directional key, the guide block is fixedly embedded in the directional key slot provided in the circulation sleeve, the directional key is movably arranged in the directional key slot, the directional key is located at the lower end of the guide block and is elastically slidably connected to the guide block;

[0006] It also includes a paddle, which is arranged in a groove opened on one side of the directional key, and the paddle is eccentrically connected to a slotted flat-end set screw, and the slotted flat-end set screw is threadedly connected to the circulation sleeve;

[0007] It also includes a locking plate, which is fixed in a groove opened on one side of the main valve head assembly. A serrated groove is provided on one side of the locking plate, and the serrated groove is consistent with and opposite to the locking tongue provided at the lower end of the directional key.

[0008] Furthermore: the lower end of the guide block is integrally designed with a guide rod, and a compression spring is sleeved on the guide rod; a guide rod hole is opened on the directional key, and the guide rod is slidably inserted in the guide rod hole, and one end of the compression spring is against the root of the guide rod, and the other end is against the bottom of the guide rod hole.

[0009] Furthermore, a locking tongue is integrally designed at the lower end of the directional key, the root of the locking tongue transitions with the directional key body in an arc, and the tip of the locking tongue has an inclined surface.

[0010] Furthermore: the sawtooth-shaped slot edge of the locking piece has an arc transition.

[0011] Furthermore: when the paddle rotates, the directional key is moved up and down.

[0012] Compared with the prior art, the beneficial effects of the utility model are embodied in:

[0013] 1. The structure is simple, and the bottom end of the directional key can be easily embedded in the locking plate without affecting the circulation sleeve and the seat key of the main valve head assembly.

[0014] 2. It has a self-locking function, which is easy to put in but difficult to pull out, and has good anti-loosening performance. It needs to turn the paddle to release it.

[0015] 3. The directional key and locking plate are installed on the circulation sleeve and the main valve head assembly respectively. At the same time, the two cannot rotate radially, so the radial positioning is accurate and there is no relative rotation with the drilling tool.

[0016] 4. Easy to disassemble, the circulation sleeve can be separated from the main valve head assembly without violent disassembly.

[0017] Other features and advantages of the present invention will be set forth in the following description, and in part will become apparent from the description, or will be understood by implementing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional view of the anti-bonding structure of the utility model;

[0019] Figure 2 It is a schematic diagram of a paddle being arranged in a directional key groove in the utility model;

[0020] Figure 3 This is a schematic diagram of the paddle moving the directional key upward;

[0021] Figure 4 It is a schematic diagram of the guide block in the utility model;

[0022] Figure 5 It is a schematic diagram of the directional key in the utility model;

[0023] Figure 6This is a schematic diagram of the main valve head assembly and the circulation sleeve being debonded. DETAILED DESCRIPTION

[0024] The utility model is described in detail below in conjunction with the accompanying drawings and embodiments, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the utility model to illustrate the utility model. However, those skilled in the art should know that the following embodiments are not the only limitations on the technical scheme of the utility model, and any equivalent changes or modifications made under the spirit of the technical scheme of the utility model shall be deemed to belong to the protection scope of the utility model.

[0025] like Figure 1 As shown, an anti-key-off structure of a seat-key type wireless downhole inclinometer is arranged between a main valve head assembly 5 and a circulation sleeve 6; the anti-key-off structure includes a guide block 1, a compression spring 2 and a directional key 3, a directional key slot is opened on the circulation sleeve 6, the guide block 1 is fixedly embedded in the directional key slot opened in the circulation sleeve 6, the directional key 3 is located at the lower end of the guide block 1, and is slidably arranged in the directional key slot, and the directional key 3 and the guide block 1 are elastically slidably connected.

[0026] like Figure 4 , Figure 5 As shown, a guide rod is integrally designed at the lower end of the guide block 1, and a compression spring 2 is provided on the guide rod. The guide rod is slidably inserted into the directional key 3, and a guide rod hole is provided in the directional key 3. One end of the compression spring 2 is against the root of the guide rod of the guide block 1, and the other end is against the bottom of the guide rod hole in the directional key 3, forming a pressing arrangement, so that the directional key 3 can slide up and down.

[0027] like Figure 2 , 3 As shown, a groove is provided on one side of the directional key 3, and a plectrum 7 is provided in the groove, and the plectrum 7 is in contact with the directional key 3; a slotted flat-end set screw 8 is eccentrically provided on one side of the plectrum 7 and fixedly connected, and the slotted flat-end set screw 8 is threadedly connected to the circulation sleeve 6, and the plectrum 7 is installed on the circulation sleeve 6 through the slotted flat-end set screw 8; and the plectrum 7 rotates under the action of the slotted flat-end set screw 8, and when the long side of the plectrum pokes the groove, the directional key 3 is lifted up, and the directional key 3 slides upward; when the short side of the plectrum pokes the groove, the directional key 3 falls back and slides downward; tighten the set screw, and the directional key 3 stops at the current position.

[0028] like Figure 5 As shown, the lower end of the directional key 3 is provided with a locking tongue, which is integrally formed with the directional key body. The root of the locking tongue transitions with the directional key body in an arc to reduce wear, and the tip of the locking tongue has a bevel for easy insertion and removal from a locking hole.

[0029] like Figure 1As shown, the anti-key-off structure also includes a locking piece 4, which is fixed in a groove opened on one side of the main valve head assembly 5; one end of the locking piece 4 is serrated, and all edges of the serrations are arc-shaped to prevent wear. The locking tongue at the lower end of the directional key 3 matches the shape of the locking piece 4, and the locking tongue at the lower end of the directional key 3 can be inserted into the serrated groove of the locking piece 4 when the directional key 3 slides, thereby locking the main valve head assembly 5 and the circulation sleeve 6.

[0030] The working principle of the utility model is as follows: the utility model product is suitable for a seat-key type MWD wireless downhole inclinometer. When it is necessary to lock the main valve head assembly 5 and the circulation sleeve 6, firstly, the paddle 7 on the side of the directional key 3 is laid flat so that the directional key 3 can move up and down, and then the main valve head assembly 5 with the locking plate 4 installed is pressed down into the circulation sleeve 6, and the circulation sleeve 6 is moved to find a suitable assembly position for the two. During the movement of the circulation sleeve, the locking tongue at the lower end of the directional key 3 slides and contacts the serrated groove of the locking plate 4, so that the directional key 3 slides up and down; when the seat key is in place, the directional key 3 is pressed down and locked tightly with the locking plate 4 under the elastic force of the compression spring 2, and at this time, the main valve head assembly 5 and the circulation sleeve 6 form a self-locking.

[0031] When the key needs to be removed, use a flat-head screwdriver to rotate the slotted flat-end set screw 8 on the circulation sleeve 6. The slotted flat-end set screw 8 rotates to drive the pick 7 to push the directional key 3 upward, and the directional key 3 pops open. Figure 6 As shown, the main valve head assembly 5 can now be pulled out of the circulation sleeve 6; finally, the paddle 7 is reset to restore the self-locking function.

[0032] Although the embodiments of the present invention have been shown and described above, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A key-type wireless downhole inclinometer anti-keying structure, arranged between the main valve head assembly and the circulation sleeve, characterized in that: It comprises a guide block and a directional key, wherein the guide block is fixedly embedded in a directional key slot provided in a circulation sleeve, the directional key is movably arranged in the directional key slot, and the directional key is located at the lower end of the guide block and is elastically slidably connected to the guide block; It also includes a paddle, which is arranged in a groove opened on one side of the directional key, and the paddle is eccentrically connected to a slotted flat-end set screw, and the slotted flat-end set screw is threadedly connected to the circulation sleeve; It also includes a locking plate, which is fixed in a groove opened on one side of the main valve head assembly. A serrated groove is provided on one side of the locking plate, and the serrated groove is consistent with and opposite to the locking tongue provided at the lower end of the directional key.

2. The anti-key-off structure of the seat-key type wireless while drilling inclinometer according to claim 1 is characterized in that: The lower end of the guide block is integrally designed with a guide rod, and a compression spring is sleeved on the guide rod; A guide rod hole is provided on the directional key, the guide rod is slidably inserted in the guide rod hole, one end of the compression spring abuts against the root of the guide rod, and the other end abuts against the bottom of the guide rod hole.

3. The anti-key-off structure of the seat-key type wireless while drilling inclinometer according to claim 1 or 2, characterized in that: The lower end of the directional key is integrally designed with a locking tongue, the root of the locking tongue transitions with the directional key body in an arc, and the tip of the locking tongue has an inclined surface.

4. The anti-key-off structure of the seat-key type wireless while-drilling inclinometer according to claim 1 is characterized in that: The sawtooth-shaped slot edge of the locking piece has an arc transition.

5. The anti-key-off structure of the seat-key type wireless while drilling inclinometer according to claim 1 is characterized in that: When the paddle rotates, the directional key is moved up and down.

Images