A kind of horizontal well logging instrument straightening guide buffer device

Abstract

The present invention relates to the field of petroleum logging, and in particular to a horizontal well logging instrument righting, guiding and buffering device for a horizontal well storage logging system. The device comprises an upper joint, which is sequentially connected to a righting assembly and a guiding assembly. The righting assembly is mainly composed of a righting arm seat, a righting arm, a push rod, an arm retracting spring and a limiter; the guiding assembly is mainly composed of an upper guide cylinder, a lower guide rod, a guide body, a guide rubber cone and a shock-absorbing spring; the device can be applied to both pump-out logging and drill pipe conveying logging. When the logging instrument encounters severe obstruction, the device can automatically right itself and center the buffer in the wellbore, thereby improving the success rate of storage logging and reducing safety risks.

Description

Technical Field

[0001] The invention relates to the field of petroleum logging, in particular to a horizontal well logging instrument straightening, guiding and buffering device used in a horizontal well storage logging system for straightening, guiding and buffering. Background Art

[0002] Horizontal well technology can significantly improve the production capacity of marginal economic oil fields, reduce comprehensive costs, and increase the production of oil layers. The current horizontal well logging technology mainly includes pump-out logging and drill pipe conveyed logging. When pumping out logging, the instrument rushes out of the drill pipe and is subjected to a large impact force during the collision, which can easily cause damage to sensitive components in the logging instrument. Therefore, a single guide buffer is generally used to buffer and protect the instrument. Drill pipe conveyed logging is to hang the logging instrument under the drill pipe, and use the drilling tool to transport the logging instrument down the well, and realize logging while transporting. Compared with pump-out logging, it saves logging time and improves production efficiency. During the transportation of the drill pipe conveyed logging instrument, it may encounter obstruction or wellbore necking in the wellbore. It is difficult for the traditional single guide buffer to pass through similar well sections, causing the instrument to encounter obstruction or even damage. For those skilled in the art, it is of great significance to provide a design scheme for a horizontal well logging instrument straightening guide buffer device. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a horizontal well logging instrument straightening guide buffer device to solve the problem that a traditional single guide buffer is difficult to pass through when encountering obstruction or wellbore necking, and to provide a straightening guide buffer device that can be used for both pump-out logging and drill pipe conveyed logging. When the instrument encounters severe obstruction, it can automatically straighten and center the guide buffer through the wellbore.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0005] A horizontal well logging instrument straightening guide buffer device comprises an upper cover cap and an upper joint. The upper cover cap is sealed and connected to the upper end of the upper joint. The upper joint is sequentially connected with a straightening assembly and a guide assembly. The straightening assembly is mainly composed of a core shaft, a straightening arm seat, a straightening arm, a push plate seat, a push rod, an arm retracting spring, a guide cylinder and a push rod pin; the straightening arm seat is connected to the lower end of the lower joint; the guide cylinder is fixedly arranged on the righting arm seat; the core shaft is fixedly sleeved in the guide cylinder; the righting arm is hinged between the righting arm seat and the push plate seat; a first limiting step is provided on the core shaft, and an annulus is provided between the shaft section of the core shaft from the first limiting step downward and the inner wall of the guide cylinder; the push rod is slidably inserted in the guide cylinder, and the push rod is provided with a center hole, which is a blind hole; the push rod is slidably inserted in the annulus through the center hole; the arm retracting spring is sleeved between the first limiting step and the upper end face of the push rod; a limiting hole is provided on the guide cylinder, and the push rod pin passes through the limiting hole to connect the push rod and the push plate seat.

[0006] Furthermore, the guide assembly is mainly composed of a guide rod, a shock-absorbing spring, a guide body, and a guide rubber cone; a second limit step is provided on the outer wall of the guide cylinder, and the second limit step is located below the push plate seat; the guide rod is slidably inserted into the lower end of the guide cylinder; the guide body is fixedly connected to the lower end of the guide rod; the guide rubber cone is sleeved on the guide body; the shock-absorbing spring is sleeved between the second limit step and the guide body.

[0007] Furthermore, the righting arm is mainly composed of an active arm and a driven arm. One end of the active arm is hinged to the push plate seat, and the other end is hinged to the driven arm; one end of the driven arm is hinged to the active arm, and the other end is hinged to the righting arm seat.

[0008] Furthermore, a pressure ring is arranged on the upper end surface of the guide body.

[0009] Furthermore, the joints between the second limiting step and the push plate seat and the shock absorbing spring, and the joints between the shock absorbing spring and the pressure ring and the guide body are all sleeved with wear-resistant sleeves.

[0010] Furthermore, the righting arms are symmetrically arranged in at least two groups.

[0011] Furthermore, when the arm retracting spring is not subjected to force, the straightening arm fits against the guide cylinder, and its overall diameter is less than or equal to the straightening arm seat and the push plate seat.

[0012] Furthermore, the limiting hole is a long hole, and the length of the long hole meets the retraction and extension stroke requirement of the righting arm.

[0013] Furthermore, the guide body is provided with a third limiting step, the guide rubber cone is provided with an inner hole consistent with the outer shape of the guide body, and the third limiting step is limitedly matched with the guide rubber cone.

[0014] The beneficial effects of the present invention are:

[0015] The righting guide buffer device of the present invention is applicable to both pump-out logging and drill pipe conveying logging. When the logging instrument encounters severe obstruction, it can automatically right itself and center the buffer in the wellbore, thereby improving the success rate of storage logging and reducing safety risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of an embodiment of the righting guide buffer device provided by the present invention;

[0017] Figure 2 It is a schematic cross-sectional structure diagram of the righting guide buffer device provided by the present invention;

[0018] In the figure: 1 upper joint, 2 guide body, 3 lower guide rod, 4 straightening arm seat, 5 push plate seat, 6 active arm, 7 driven arm, 8 upper guide cylinder, 9 pressure ring, 10 wear-resistant sleeve, 11 guide column, 12 core shaft, 13 push rod, 14 shock-absorbing spring, 15 arm retracting spring, 16 pin, 17 upper cover cap, 18 arm head pin, 19 limiting hole, 20 push rod pin, 21 second limiting step, 22 third limiting step. DETAILED DESCRIPTION

[0019] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0020] Embodiment 1:

[0021] See also Figure 1-2 A horizontal well logging instrument straightening guide buffer device, comprising an upper joint (1), a core shaft (12), a straightening arm seat (4), an upper guide cylinder (8), a driven arm (7), an active arm (6), an arm retracting spring (15), a push rod (13), a push plate seat (5), a damping spring (14), a lower guide rod (3), a wear-resistant sleeve (10), a guide body (2), etc. In a natural state, the straightening arms (6, 7) are retracted by the pre-compression force of the arm retracting spring (15), and the damping spring (14) is in a pre-compression state. When the instrument encounters severe resistance, such as Figure 1 As shown, the guide body (2) pushes the lower guide rod (3), and the shock absorbing spring (14) begins to compress. When the resistance is severe enough, the shock absorbing spring (14) continues to compress. When the working limit of the shock absorbing spring (14) is about to be reached, the left end face of the lower guide rod (3) contacts the end face of the push rod (13). At this time, the lower guide rod (3) pushes the push rod (13) and opens the righting arms (6, 7). During the opening of the righting arms (6, 7), the instrument can be lifted, so that the guide body (2) can smoothly pass through the resistance section. After that, the shock absorbing spring (14) and the lower guide rod (3) return to their original positions, and the righting arms (6, 7) are retracted under the action of the arm retracting spring (15) and the deadweight of the instrument.

[0022] Embodiment 2:

[0023] Buffer segment implementation:

[0024] The damping spring (14) is sleeved on the outside of the upper guide cylinder (8), the lower guide rod (3) passes through the cavity of the upper guide cylinder (8) and extends out, the damping spring (14) is pressed by the pressure ring (9) through the thread on the lower guide rod (3), the guide body (2) is screwed onto the thread of the lower guide rod (3) and is tightly attached to the pressure ring (9), and the lower guide rod (3) can slide freely in the cavity of the upper guide cylinder (8).

[0025] Righting arm implementation:

[0026] The active arm (6) and the driven arm (7) are respectively fixed to the push plate seat (5) and the righting arm seat (4) by a pin (18); the push plate seat (5) and the righting arm seat (4) are mounted on an upper guide cylinder (8); the active arm (6) and the driven arm (7) are connected by an arm head pin (19); an anti-locking sleeve (11) is mounted on the upper guide cylinder (8) below the righting arm (6, 7) to prevent the righting arm (6, 7) from getting stuck; a wear-resistant sleeve (10) is mounted on the right end of the righting arm (6, 7) to protect the righting arm (6, 7).

[0027] Push rod and push plate implementation:

[0028] Reference Figure 1 The push rod (13) is located in the cavity of the upper guide cylinder (8), and the push rod pin (18) passes through the push rod (13) through the hole on the push plate seat (5) and the limit hole (16) of the upper guide cylinder (8). The push rod (13) can drive the push plate seat (5) to slide on the upper guide cylinder (8), and when the push plate seat (5) slides, the straightening arms (6, 7) can be opened.

[0029] Embodiment three:

[0030] A horizontal well logging instrument straightening guide buffer device comprises an upper cover cap and an upper joint. The upper cover cap is sealed and connected to the upper end of the upper joint. The upper joint is sequentially connected with a straightening assembly and a guide assembly.

[0031] The straightening assembly is mainly composed of a core shaft, a straightening arm seat, a straightening arm, a push plate seat, a push rod, an arm retracting spring, a guide cylinder and a push rod pin; the straightening arm seat is connected to the lower end of the lower joint; the guide cylinder is fixedly arranged on the righting arm seat; the core shaft is fixedly sleeved in the guide cylinder; the righting arm is hinged between the righting arm seat and the push plate seat; a first limiting step is provided on the core shaft, and an annulus is provided between the shaft section of the core shaft from the first limiting step downward and the inner wall of the guide cylinder; the push rod is slidably inserted in the guide cylinder, and the push rod is provided with a center hole, which is a blind hole; the push rod is slidably inserted in the annulus through the center hole; the arm retracting spring is sleeved between the first limiting step and the upper end face of the push rod; a limiting hole is provided on the guide cylinder, and the push rod pin passes through the limiting hole to connect the push rod and the push plate seat.

[0032] The guide assembly is mainly composed of a guide rod, a shock-absorbing spring, a guide body, and a guide rubber cone; a second limit step is arranged on the outer wall of the guide cylinder, and the second limit step is located below the push plate seat; the guide rod is slidably inserted into the lower end of the guide cylinder; the guide body is fixedly connected to the lower end of the guide rod; the guide rubber cone is sleeved on the guide body; the shock-absorbing spring is sleeved between the second limit step and the guide body.

[0033] The righting arm is mainly composed of an active arm and a driven arm. One end of the active arm is hinged to the push plate seat, and the other end is hinged to the driven arm; one end of the driven arm is hinged to the active arm, and the other end is hinged to the righting arm seat. A pressure ring is arranged on the upper end surface of the guide body. The joint part of the second limiting step, the push plate seat, and the shock absorbing spring, and the joint part of the shock absorbing spring, the pressure ring, and the guide body are all covered with wear-resistant sleeves. There are at least two groups of righting arms symmetrically arranged. When the arm retracting spring is not under force, the righting arm fits on the guide cylinder, and its overall diameter is less than or equal to the righting arm seat and the push plate seat. The limiting hole is a long hole, and the length of the long hole meets the retraction and extension stroke requirements of the righting arm. A third limiting step is arranged on the guide body, and the guide rubber cone is provided with an inner hole consistent with the shape of the guide body, and the third limiting step is limited and matched with the guide rubber cone.

[0034] The working principle of the present invention is: in the natural state, the righting arm is closed by the pre-compression force of the arm-retracting spring, and the shock-absorbing spring is in a pre-compressed state. Figure 1 As shown, the guide body pushes the lower guide rod, and the shock-absorbing spring begins to compress. When the resistance is severe enough, the shock-absorbing spring continues to compress. When the working limit of the shock-absorbing spring is about to be reached, the left end face of the lower guide rod contacts the end face of the push rod. At this time, the lower guide rod pushes the push rod and opens the righting arm. During the opening of the righting arm, the instrument can be lifted to allow the guide body to pass through the resistance section smoothly. After that, the shock-absorbing spring and the lower guide rod return to their positions, and the righting arm is retracted under the action of the arm retraction spring and the instrument's own weight.

[0035] Although the embodiments of the present invention have been shown and described, it will be appreciated 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 claims and their equivalents.

Claims

1. A horizontal well logging instrument straightening guide buffer device, comprising an upper cap and an upper joint, wherein the upper cap is sealed and connected to the upper end of the upper joint, characterized in that: The upper joint is connected with a straightening assembly and a guide assembly in sequence. The straightening assembly mainly consists of a core shaft, a straightening arm seat, a straightening arm, a push plate seat, a push rod, an arm retracting spring, a guide cylinder and a push rod pin; the straightening arm seat is connected to the lower end of the lower joint; the guide cylinder is fixedly mounted on the straightening arm seat; the core shaft is fixedly sleeved in the guide cylinder; the straightening arm is hinged between the straightening arm seat and the push plate seat, and an anti-lock sleeve is arranged between the straightening arm and the guide cylinder; a first limiting step is arranged on the core shaft, and an annulus is arranged between the shaft section of the core shaft from the first limiting step downward and the inner wall of the guide cylinder; the push rod is slidably inserted in the guide cylinder, and the push rod is provided with a center hole, which is a blind hole; the push rod is slidably inserted in the annulus through the center hole; the arm retracting spring is sleeved between the first limiting step and the upper end surface of the push rod; a limiting hole is arranged on the guide cylinder, and the push rod pin passes through the limiting hole to connect the push rod and the push plate seat. The guide assembly is mainly composed of a guide rod, a shock absorbing spring, a guide body, and a guide rubber cone; a second limit step is arranged on the outer wall of the guide cylinder, and the second limit step is located below the push plate seat; the guide rod is slidably inserted into the lower end of the guide cylinder; the guide body is fixedly connected to the lower end of the guide rod; the guide rubber cone is sleeved on the guide body; the shock absorbing spring is sleeved between the second limit step and the guide body, The damping spring is configured to be continuously compressed when the guide body encounters resistance, so that the guide rod can contact and push the push rod to open the righting arm, thereby allowing the guide body to pass through the resistance section during the opening of the righting arm.

2. A horizontal well logging tool centralizing guide buffer device according to claim 1, characterized in that: The righting arm is mainly composed of an active arm and a driven arm. One end of the active arm is hinged to the push plate seat, and the other end is hinged to the driven arm; one end of the driven arm is hinged to the active arm, and the other end is hinged to the righting arm seat.

3. The horizontal well logging tool centralizing guide buffer device according to claim 1, characterized in that: A pressure ring is arranged on the upper end surface of the guide body.

4. A horizontal well logging tool centralizing guide buffer device according to claim 3, characterized in that: The joints of the second limiting step, the push plate seat and the damping spring, and the joints of the damping spring, the pressure ring and the guide body are all sleeved with wear-resistant sleeves.

5. A horizontal well logging tool centralizing guide buffer device according to claim 4, characterized in that: The righting arms are symmetrically arranged in at least two groups.

6. A horizontal well logging tool centralizing guide buffer device according to claim 5, characterized in that: When the arm retracting spring is not subjected to force, the straightening arm is fitted to the guide cylinder, and its overall diameter is less than or equal to the straightening arm seat and the push plate seat.

7. A horizontal well logging tool centralizing guide buffer device according to claim 6, characterized in that: The limiting hole is a long hole, and the length of the long hole meets the retraction and extension stroke requirement of the righting arm.

8. The horizontal well logging tool centralizing guide buffer device according to claim 7, characterized in that: The guide body is provided with a third limiting step, the guide rubber cone is provided with an inner hole consistent with the shape of the guide body, and the third limiting step is limitedly matched with the guide rubber cone.

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