A rubber centralizer rubber wing cutting device and its installation and use method

Abstract

The present invention discloses a rubber centralizer rubber wing cutting device and its installation and use method. The device includes an internal thread cylinder, one end inner wall of the internal thread cylinder is threadedly connected with an external thread ring, and the other end is provided with two clamping half rings, and more than two chutes are arranged on each clamping half ring; an axial keyway is arranged on the inner wall of the internal thread cylinder, and a cylindrical cutter holder is installed inside the internal thread cylinder. The rubber centralizer rubber wing cutting device and the use method disclosed by the present invention can adjust the distance between multiple cutters by the cooperation of the conical surface between the cutter adjusting ring and the cutter, so as to steplessly adjust the distance between multiple cutters within a certain range and cut the centralizer to the required outer diameter. It can directly cut the rubber centralizer connected to the instrument string without having to remove it from the instrument string in advance, with a wide application range and good adaptability. The spiral transmission mechanism is adopted, which saves time and effort and can quickly complete the cutting work.

Description

Technical Field

[0001] The present invention belongs to the technical field of drilling engineering in oil, coal mines, and geological exploration, and particularly relates to a rubber wing cutting device for a rubber centralizer in a measurement while drilling (MWD) and logging while drilling (LWD) instrument in this field, as well as an installation and use method thereof. Background Art

[0002] The inner diameters of non-magnetic drill collars have different specifications, and due to long-term use and being scoured by mud, the inner diameters will also change. Rubber centralizers for wireless measurement while drilling instruments are usually produced by professional manufacturers according to certain specific dimensions. Before actual operation, it is necessary to cut and correct the rubber wings of the centralizer according to the current inner diameter of the non-magnetic drill collar to ensure that the centralizer can play a good centralizing role. Field operators often use a utility knife for rubber wing cutting work, which is not only time-consuming and laborious, with low efficiency, but also difficult to ensure accuracy. The cutting surface is uneven and is more easily damaged by mud scouring. In severe cases, it will even affect the normal operation of the instrument underground.

[0003] The cutter disclosed in the patent with the patent number 201820926567.5 includes a threaded screw rod, a rubber sleeve pressing cylinder, a cutter, a cross beam, and a positioning tube for sleeving the rubber sleeve. The cross beam is located above the positioning cylinder, the cutter is sleeved on the positioning tube, the cutter is a hollow frustum of a cone, the threaded screw rod passes through the cross beam and the threaded screw rod is located above the positioning tube, the rubber sleeve pressing cylinder is connected to the bottom end of the threaded screw rod, and the centers of the end faces of the rubber sleeve pressing cylinder, the cutter, and the positioning tube are on a straight line. After sleeving the rubber sleeve of the centralizer to be processed on the threaded screw rod, the rubber sleeve can be pressed down by the rubber sleeve pressing cylinder to make it contact the cutter to achieve the effect of cutting the rubber sleeve. By replacing cutters of different sizes, the cutting thickness of the rubber sleeve can be controlled. The cutter of this patent has a fixed size and cannot be adjusted in time according to the inner diameter of the non-magnetic drill collar. Moreover, the cutting work needs to be completed before the rubber centralizer is installed on the instrument string. If it is necessary to trim the rubber centralizer that has been connected to the instrument string, it also needs to be disassembled first, which is time-consuming and laborious. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a rubber wing cutting device for a rubber centralizer and an installation and use method thereof.

[0005] The present invention adopts the following technical solutions:

[0006] A rubber centralizer rubber wing cutting device, the improvement of which lies in: it includes an internal thread cylinder, one end inner wall of the internal thread cylinder is threadedly connected with an external thread ring, and two clamping half rings are arranged at the other end. More than two chutes are arranged on each clamping half ring. The tension screws in the chutes connect the clamping half rings and the internal thread cylinder together, and the clamping half rings can move along the tension screws within the range of the chutes. After the two clamping half rings are combined together, there is a through hole for the centralizer metal body to pass through and they can be fixedly connected through clamping screws; an axial keyway is arranged on the inner wall of the internal thread cylinder, and a screw that can slide along the keyway is installed in the keyway. A cylindrical cutter holder is installed inside the internal thread cylinder. The front part of the cutter holder is fixedly connected with the screw in the keyway, and the rear part of the cutter holder abuts against the external thread ring through a thrust bearing. In addition, the inner wall of the rear part of the cutter holder is also threadedly connected with a cutter adjusting ring with a conical surface at the top. A ring-shaped protrusion is arranged inside the cutter holder, and cutters that can slide radially along the protrusion and correspond to the number of rubber wings of the centralizer are erected on the protrusion. The bottom of the cutter is a conical surface that matches the conical surface at the top of the cutter adjusting ring and abuts against the conical surface at the top of the cutter adjusting ring. A set screw is arranged on the side wall of the cutter holder to press the conical surface at the bottom of the cutter against the conical surface at the top of the cutter adjusting ring.

[0007] Further, two symmetrically arranged chutes are arranged on each clamping half ring.

[0008] Further, the tension screws in the chutes are fixedly connected with the internal thread cylinder by means of threaded connection, welding, riveting or gluing.

[0009] Further, a non-loosening screw facing the other clamping half ring is installed on each clamping half ring as a clamping screw. The two clamping screws are respectively located on both sides of the clamping half ring, and a threaded hole facing the clamping screw of the other clamping half ring is also respectively arranged on each clamping half ring.

[0010] Further, the screw installed in the keyway and capable of sliding along the keyway is replaced with a key or a pin, and the front part of the cutter holder is fixedly connected with the key or the pin in the keyway.

[0011] Further, a groove facing the protrusion of the cutter holder is arranged at the waist of the cutter, and the inner rear side of the groove abuts against the outer rear side of the protrusion.

[0012] An installation and use method, applicable to the rubber centralizer rubber wing cutting device described above, is improved in that: a ring-shaped protrusion is arranged inside the cutter holder, and cutters corresponding to the number of rubber wings of the centralizer are erected on the protrusion. Rotate the cutter adjustment ring so that the top conical surface of the cutter adjustment ring and the bottom conical surfaces of the cutters have relative sliding, so that each cutter synchronously slides radially along the protrusion of the cutter holder. After the distance between the cutters is appropriate, stop rotating the cutter adjustment ring and tighten the set screw to fix each cutter between the cutter holder and the cutter adjustment ring. The front part of the cutter holder is fixedly connected to the screw in the keyway; separate the two clamping half-rings along the tension screw, insert the internal thread cylinder from the rear end of the centralizer metal body and make the cutting edges of each cutter press against the rubber wing to be cut, then close the two clamping half-rings along the tension screw and fix them with the clamping screw. Turn the external thread ring, and push the cutter holder to move forward along the axial keyway on the inner wall of the internal thread cylinder through the thrust bearing, thereby driving each cutter to move forward, so that the cutting edges of each cutter cut the rubber wing. After cutting is completed, separate the two clamping half-rings, and then continue to cut forward or withdraw the internal thread cylinder from the rear end of the centralizer metal body.

[0013] Further, after inserting the internal thread cylinder from the rear end of the centralizer metal body and making the cutting edges of each cutter press against the rubber wing to be cut, clamp the two clamping half-rings on the front part of the centralizer metal body or the outer cylinder of the instrument string in front of the centralizer metal body.

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

[0015] The rubber centralizer rubber wing cutting device disclosed by the present invention can adjust the distance between multiple cutters through the cooperation of the conical surfaces between the cutter adjustment ring and the cutters, so as to steplessly adjust the distance between multiple cutters within a certain range and cut the centralizer to the required outer diameter. It can directly cut the rubber centralizer connected to the instrument string without having to remove it from the instrument string in advance. It has a wide application range and good adaptability. It adopts a screw drive mechanism, which saves time and effort and can quickly complete the cutting work.

[0016] The installation and use method disclosed by the present invention, when it is necessary to trim the outer diameter of the centralizer of the assembled instrument string, it is not necessary to disassemble the centralizer from the instrument string, but directly insert it from one end of the instrument string and sequentially cut all the rubber centralizers on the instrument string to the specified size, which saves time and effort and has good adaptability. Description of the Drawings

[0017] Figure 1 is the main sectional view of the rubber centralizer rubber wing cutting device disclosed in Embodiment 1 of the present invention;

[0018] Figure 2 is Figure 1 the A-A sectional view of

[0019] Figure 3It is an axonometric view of the rubber centralizer rubber wing cutting device disclosed in Embodiment 1 of the present invention. Detailed implementation manners

[0020] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] Embodiment 1, as Figure 1 , shown in Fig. 3, this embodiment discloses a rubber centralizer rubber wing cutting device, which includes an internal thread cylinder 5. One end inner wall of the internal thread cylinder is threadedly connected to an external thread ring, and the other end is provided with two clamping half rings 1, 2. On each clamping half ring, more than two sliding grooves 15 are provided. The tension screws 14 in the sliding grooves connect the clamping half rings and the internal thread cylinder together, and the clamping half rings can move along the tension screws within the range of the sliding grooves (that is, the tension screws only limit the axial movement of the clamping half rings relative to the internal thread cylinder, and do not limit the movement along the sliding grooves. The axial direction refers to Figure 1 the horizontal direction in the figure). After the two clamping half rings are combined together, there is a through hole for the centralizer metal body 3 to pass through and can be fixedly connected by a clamping screw 13; an axial key groove 16 is provided on the inner wall of the internal thread cylinder, and a screw 6 that can slide along the key groove is installed in the key groove. A cylindrical cutter holder 8 is installed inside the internal thread cylinder. The front part of the cutter holder is fixedly connected to the screw in the key groove to prevent the cutter in it from rotating driven by the rotation of the cutter holder during the cutting process, affecting the cutting quality. The rear part of the cutter holder abuts against the external thread ring 12 through a thrust bearing 10. In addition, the inner wall of the rear part of the cutter holder is also threadedly connected to a cutter adjustment ring 11 with a conical surface at the top. A ring-shaped protrusion 17 is provided in the cutter holder, and a cutter 7 that can slide along the radial direction of the protrusion (the radial direction refers to Figure 1 the vertical direction in the figure) and corresponds to the number of rubber wings 4 of the centralizer (for example, a centralizer with four rubber wings corresponds to four cutters) is erected on the protrusion. The bottom of the cutter is a conical surface that cooperates with the conical surface at the top of the cutter adjustment ring and abuts against the conical surface at the top of the cutter adjustment ring. Rotating the cutter adjustment ring can cause its conical surface to slide relative to the conical surfaces of the cutters, thereby changing the distance from the cutter tip to the axis of the centralizer, that is, adjusting the spacing between the cutters. A set screw 9 that can press the conical surface at the bottom of the cutter against the conical surface at the top of the cutter adjustment ring is provided on the side wall of the cutter holder. Tightening the set screw can fix the position of the cutter.

[0022] As Figure 2As shown in the figure, in this embodiment, two symmetrically arranged chutes are provided on each clamping half-ring. The tension screw in the chute is fixedly connected to the internal-thread cylinder by means of threaded connection, welding, riveting or bonding. A non-loosening screw facing the other clamping half-ring is installed on each clamping half-ring as a clamping screw. The two clamping screws are respectively located on both sides of the clamping half-ring. A threaded hole facing the clamping screw of the other clamping half-ring is also provided on each clamping half-ring.

[0023] The screw installed in the keyway and slidable along the keyway can also be replaced with a key or a pin, and the front part of the cutter holder is fixedly connected to the key or pin in the keyway.

[0024] A groove facing the protrusion is provided at the waist of the cutter, and the inner rear side of the groove abuts against the outer rear side of the protrusion.

[0025] In this embodiment, the adjustable cutter assembly composed of multiple cutters, cutter holders and cutter adjustment rings can be changed into cutters of certain fixed sizes, and cooperate with other parts of the cutting device in this embodiment to realize the cutting work of certain fixed sizes of the rubber centralizer. This inventive concept should also be included within the scope of protection of this patent.

[0026] This embodiment also discloses an installation and use method, which is applicable to the above-mentioned rubber centralizer rubber wing cutting device. A ring-shaped protrusion is provided in the cutter holder, and cutters corresponding to the number of rubber wings of the centralizer are erected on the protrusion. Rotate the cutter adjustment ring so that the top conical surface of the cutter adjustment ring and the bottom conical surfaces of the cutters have relative sliding, so that each cutter synchronously slides radially along the protrusion. After the distance between the cutters is appropriate, stop rotating the cutter adjustment ring, and tighten the set screw to fix each cutter between the cutter holder and the cutter adjustment ring. The front part of the cutter holder is fixedly connected to the screw in the keyway; separate the two clamping half-rings along the tension screw, and it can cross the rubber wing to be cut on the centralizer metal body. After sleeving the internal-thread cylinder from the rear end of the centralizer metal body and making the cutting edges of each cutter abut against the rubber wing to be cut, then close the two clamping half-rings along the tension screw and fix them with the clamping screw, so that the two clamping half-rings clamp the centralizer metal body. Turn the external-thread ring, and push the cutter holder to move forward along the axial keyway on the inner wall of the internal-thread cylinder through the thrust bearing, and then drive each cutter to move forward, so that the cutting edges of each cutter cut the rubber wing and make the outer diameter of the rubber wing reach the required size. After cutting, separate the two clamping half-rings again, and then continue to cut forward or withdraw the internal-thread cylinder from the rear end of the centralizer metal body.

[0027] After sleeving the internal-thread cylinder from the rear end of the centralizer metal body and making the cutting edges of each cutter abut against the rubber wing to be cut, clamp the two clamping half-rings on the front part of the centralizer metal body or the outer cylinder of the instrument string in front of the centralizer metal body.

Claims

1. A rubber centralizer rubber wing cutting device, characterized in that: It includes an internal thread cylinder. One end inner wall of the internal thread cylinder is threadedly connected with an external thread ring, and two clamping half rings are arranged at the other end. More than two sliding grooves are arranged on each clamping half ring. The tension screws in the sliding grooves connect the clamping half rings and the internal thread cylinder together, and the clamping half rings can move along the tension screws within the range of the sliding grooves. After the two clamping half rings are combined, there is a through hole for the centralizer metal body to pass through and can be fixedly connected by a clamping screw; an axial key groove is arranged on the inner wall of the internal thread cylinder, and a screw that can slide along the key groove is installed in the key groove. A cylindrical cutter holder is installed inside the internal thread cylinder. The front part of the cutter holder is fixedly connected with the screw in the key groove, and the rear part of the cutter holder abuts against the external thread ring through a thrust bearing. In addition, the inner wall of the rear part of the cutter holder is also threadedly connected with a cutter adjusting ring with a conical surface at the top. An annular protrusion is arranged in the cutter holder, and cutters that can slide radially along the protrusion and correspond to the number of rubber wings of the centralizer are arranged on the protrusion. The bottom of the cutter is a conical surface that cooperates with the conical surface at the top of the cutter adjusting ring and abuts against the conical surface at the top of the cutter adjusting ring. A set screw is arranged on the side wall of the cutter holder to press the conical surface at the bottom of the cutter against the conical surface at the top of the cutter adjusting ring.

2. The rubber centralizer rubber wing cutting device according to claim 1, characterized in that: Two symmetrically arranged sliding grooves are arranged on each clamping half ring.

3. The rubber centralizer rubber wing cutting device according to claim 1, characterized in that: The tension screws in the sliding grooves are fixedly connected with the internal thread cylinder by means of threaded connection, welding, riveting or gluing.

4. The rubber centralizer rubber wing cutting device according to claim 1, characterized in that: A non-loosening screw facing the other clamping half ring is installed on each clamping half ring as a clamping screw. The two clamping screws are respectively located on both sides of the clamping half ring, and a threaded hole facing the clamping screw of the other clamping half ring is also respectively arranged on each clamping half ring.

5. The rubber centralizer rubber wing cutting device according to claim 1, characterized in that: The screw installed in the key groove and capable of sliding along the key groove is replaced with a key or a pin, and the front part of the cutter holder is fixedly connected with the key or the pin in the key groove.

6. The rubber centralizer rubber wing cutting device according to claim 1, characterized in that: A groove facing the protrusion of the cutter holder is arranged at the waist of the cutter, and the inner rear side of the groove abuts against the outer rear side of the protrusion.

7. An installation and use method, applicable to the rubber centralizer rubber wing cutting device according to claim 1, characterized in that: A circular protrusion is arranged inside the cutter holder, and cutters corresponding to the number of rubber wings of the centralizer are installed on the protrusion. Rotate the cutter adjustment ring so that the top conical surface of the cutter adjustment ring and the bottom conical surfaces of the cutters slide relative to each other, so that each cutter synchronously slides radially along the protrusion of the cutter holder. After the distance between the cutters is appropriate, stop rotating the cutter adjustment ring and tighten the set screws to fix each cutter between the cutter holder and the cutter adjustment ring. The front part of the cutter holder is fixedly connected to the screw in the keyway; separate the two clamping half rings along the tension screw, insert the inner threaded cylinder from the rear end of the centralizer metal body and make the cutting tips of the cutters abut against the rubber wings to be cut, then close the two clamping half rings along the tension screw and fix them with the clamping screw. Turn the external threaded ring to push the cutter holder forward along the axial keyway on the inner wall of the inner threaded cylinder through the thrust bearing, thereby driving each cutter forward to make the cutting tips of the cutters cut the rubber wings. After cutting is completed, separate the two clamping half rings, and then continue to cut forward or withdraw the inner threaded cylinder from the rear end of the centralizer metal body.

8. The installation and use method according to claim 7, characterized in that: After inserting the inner threaded cylinder from the rear end of the centralizer metal body and making the cutting tips of the cutters abut against the rubber wings to be cut, clamp the two clamping half rings on the front part of the centralizer metal body or the outer cylinder of the instrument string at the front part of the centralizer metal body.

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