A well-falling deceleration device for multi-point rods

Abstract

The present invention discloses a deceleration device for a multi-point rod falling into a well, which is an auxiliary tool for converting the falling kinetic energy of the multi-point rod in the process of falling into the well into the rotational kinetic energy of the rotor of the deceleration device and the friction energy loss of the contact surface between the stator and the rotor. The joint is divided into two parts, the stator and the rotor, which are installed on the drill string in sections. When the multi-point rod falls to the position of the deceleration joint, due to the internal threaded structure of the rotor, part of the falling kinetic energy of the multi-point rod is converted into the rotational kinetic energy of the rotor and the friction energy loss of the contact surface between the stator and the rotor, so that the multi-point rod can obtain a deceleration effect, and the speed is reduced to a safe range when it falls to the bottom of the well, thereby reducing the collision energy and protecting the instruments and downhole tools from damage. The device is helpful in reducing the loss of instruments and tools caused by the high-speed impact on the bottom of the well after the rod accidentally falls into the well.

Description

Technical Field

[0001] The invention relates to a deceleration device in the field of oil drilling, in particular to a well-falling deceleration device for multi-point rods, which is beneficial to reducing the loss of instruments and tools caused by high-speed impact on the well bottom after the rods accidentally fall into the well. Background Art

[0002] At present, in oil exploration and development, the use of electronic single and multi-point inclinometers is one of the main means of monitoring and assessing wellbore trajectory data during drilling construction. Especially when monitoring the trajectory of a long well section, in order to reduce the number of trips, a long steel wire is usually used to hang multi-point instruments for trajectory monitoring or trajectory review. In actual operation, when the steel wire ropes that mount the multi-point rods are aged or subjected to external forces of overload, it is easy to cause the rods to fall accidentally during the lifting process. When the probe is turned on, it falls at a certain acceleration or even free falls (air drilling construction), impacting the bottom of the well at high speed, eventually causing damage to the multi-point rods and instruments, resulting in large economic losses. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a device for reducing the speed of a multi-point rod falling into a well, which converts the falling kinetic energy of the multi-point rod into the rotational kinetic energy of the rotor and the friction between the stator and the rotor contact surfaces, thereby achieving the effect of reducing the speed of the multi-point rod. The present invention is beneficial to reducing the loss of instruments and tools caused by the high-speed impact of the rod on the bottom of the well after the rod accidentally falls into the well.

[0004] The technical solution is as follows:

[0005] A well-falling deceleration device for a multi-point rod comprises a stator and a rotor. The rotor is rotatably sleeved in the stator. The rotor is hollow inside and has a spiral guide groove extending downward from the upper edge of the rotor on the inner wall. The spiral guide groove cooperates with the sliding guide of the straightening rubber rod on the multi-point rod.

[0006] The top end of the spiral guide groove is provided with a fan-shaped notch opening opening upward.

[0007] The groove edge of the spiral guide groove is provided with a chamfer.

[0008] There are multiple spiral guide grooves.

[0009] The multiple spiral guide grooves are distributed symmetrically.

[0010] There are four spiral guide grooves.

[0011] Furthermore, the inner wall of the stator and the outer wall of the rotor are clearance-matched.

[0012] The inner wall of the stator is provided with a step, and the step is limitedly matched with the rotor.

[0013] There are two steps, which are respectively located above and below the rotor.

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

[0015] 1. The falling kinetic energy of the multi-point rod is converted into the rotational kinetic energy of the rotor and the friction energy loss of the stator-rotor contact surface, thereby realizing the deceleration of the multi-point rod;

[0016] 2. Install it on the drill string in sections to reduce the rod drop speed in stages;

[0017] 3. Protect multi-point instruments and rods to reduce collision damage;

[0018] 4. Protect possible downhole tool components and reduce third-party damage caused by multi-point rod collision. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural cross-sectional view of a well-falling speed reduction device for a multi-point rod member of the present invention;

[0020] Figure 2 It is a top view of the structure of the well-falling speed reduction device for multi-point rods of the present invention;

[0021] Figure 3 It is a schematic diagram of the AA cross-sectional structure;

[0022] Figure 4 This is a schematic diagram of the top view structure and AA section position of the first embodiment;

[0023] Markings in the figure: 1. rotor, 2. stator, 3. spiral guide groove, 21 first step, 22 second step, 31 chamfer. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] Embodiment 1:

[0026] A well-falling speed reduction device for a multi-point rod comprises a stator and a rotor, wherein the rotor is rotatably sleeved in the stator, and a bearing can be arranged between the outer wall of the rotor and the inner wall of the stator to enable the rotor to rotate flexibly. The stator and the rotor are a sleeve structure, wherein the inner wall diameter of the rotor is smaller than the inner wall diameter of the stator, and the inner wall of the rotor is provided with a spiral guide groove extending downward from the upper edge of the rotor; the spiral guide groove cooperates with the sliding guide of the straightening rubber rod on the multi-point rod.

[0027] The top end of the spiral guide groove is provided with a fan-shaped notch opening opening upward.

[0028] The groove edge of the spiral guide groove is provided with a chamfer.

[0029] There are multiple spiral guide grooves.

[0030] The multiple spiral guide grooves are distributed symmetrically.

[0031] There are four spiral guide grooves.

[0032] The inner wall of the stator and the outer wall of the rotor are clearance-matched.

[0033] The inner wall of the stator is provided with a step, and the step is limitedly matched with the rotor.

[0034] The steps are provided with two, including a first step and a second step, wherein the first step is located above the rotor, and the second step is located below the rotor.

[0035] Embodiment 2:

[0036] The present invention is installed on the drill string in sections during use. When the multi-point rod falls to the speed reduction joint position, due to the internal thread structure of the rotor, part of the falling kinetic energy of the multi-point rod is converted into the rotational kinetic energy of the rotor and the friction energy loss of the stator and rotor contact surface, thereby reducing the speed of the multi-point rod to a safe range when it falls to the bottom of the well, thereby reducing the collision energy and protecting the instrument and downhole tools from damage.

[0037] The specific method of using the device is as follows:

[0038] 1. During the drilling process, according to the drilling medium and well depth, a multi-point rod drop-down deceleration device is connected to the drill string at every depth;

[0039] 2. When performing multi-point rod hanging measurement, the wire rope connected to the rod is lowered into the drill string and needs to pass through each deceleration device at a uniform speed;

[0040] 3. The speed of the multi-point rod in the drill string should not be too fast to prevent the sudden increase of wire rope tension caused by the instantaneous deceleration of the upward movement, which may lead to the breakage of the wire rope;

[0041] 4. If the wire rope breaks, the multi-point rod will carry the instrument and accelerate to the bottom of the well. Because of the deceleration device, each time the multi-point rod passes through a deceleration device, part of its kinetic energy will be converted to achieve the deceleration effect. When it falls to the bottom of the well, the speed will be reduced to protect the multi-point instruments and the third-party equipment.

[0042] 5. Then carry out normal drilling to remove the multi-point rods that have fallen into the well.

[0043] Embodiment three:

[0044] Please refer to the instruction manual Figure 1 and 2The present invention is a kind of well-falling speed reduction device for multi-point rods, which is a speed reduction joint based on the principle of rotational inertia, and includes a rotor 1, a stator 2 and a spiral guide groove 3 on the inner wall of the rotor. Among them, the stator 2 is the outer shell of the well-falling speed reduction device, which is responsible for the upper and lower connection with the drill pipe; the rotor 1 is installed inside the stator 2, and can rotate relative to the stator 2, which can play the role of consuming the kinetic energy of the multi-point rod falling; the spiral guide groove 3 is a groove on the inner wall of the rotor 1, which is spiral in the axial direction and has four distributions.

[0045] Working principle: The present invention is an auxiliary tool that converts the falling kinetic energy of the multi-point rod into the rotational kinetic energy of the rotor of the reduction device and the friction energy loss of the stator and rotor contact surface, and uses the deceleration principle of rotational inertia. At present, the rods of the electronic multi-point projection and measurement instrument are all equipped with straightening rubber sticks, which are made of hard rubber and play the role of straighteners in the inner holes of the drill pipe and drill collar. When the multi-point rod falls to the reduction device, its straightening rubber stick will enter the spiral guide groove 3. The inner wall of the spiral guide groove 3 interacts with the straightening rubber stick of the multi-point rod, the stator and the rotor, and drives the rotor 1 and the stator 2 to rotate relative to each other. The energy used for rotation is provided by the kinetic energy of the multi-point rod falling. The friction between the contact surface of the rotor 1 and the stator 2 generates energy loss, which consumes the kinetic energy of the multi-point rod, and the multi-point rod is decelerated due to the loss of kinetic energy of falling.

Claims

1. A shaft deceleration device for a multi-point rod, comprising a stator and a rotor, wherein the rotor is rotatably sleeved in the stator, and is characterized in that: The rotor is hollow inside, and a spiral guide groove extending downward from the upper edge of the rotor is provided on the inner wall; the spiral guide groove cooperates with the sliding guide of the straightening rubber rod on the multi-point rod; the top of the spiral guide groove is provided with a fan-shaped notch opening upward; the notch edge of the spiral guide groove is provided with a chamfer; the inner wall of the stator is provided with a step, and the step cooperates with the rotor limit position; there are two steps, which are respectively located above and below the rotor.

2. The well-falling deceleration device for multi-point rods according to claim 1, characterized in that: There are multiple spiral guide grooves.

3. The well-falling deceleration device for multi-point rods according to claim 2, characterized in that: The multiple spiral guide grooves are distributed symmetrically.

4. The well-falling deceleration device for multi-point rods according to claim 3 is characterized in that: There are four spiral guide grooves.

5. The well-falling deceleration device for multi-point rods according to claim 4, characterized in that: The inner wall of the stator and the outer wall of the rotor are clearance-matched.

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