Reducing type oil pipe centralizer

Abstract

The invention relates to the technical field of centralizers, in particular to a variable-diameter oil pipe centralizer. Comprising a centralizer body, the centralizer body comprises symmetrically-distributed guide rings, symmetrically-distributed connecting rings and a plurality of spring walls, the connecting rings are fixedly connected between the symmetrically-distributed guide rings, and the spring walls are fixedly connected between the symmetrically-distributed guide rings; the number of the sliding rods is the same as that of the spring walls, and the sliding rods are fixedly connected to the adjacent spring walls and are in sliding connection with the adjacent connecting rings; the number of the extrusion frames is the same as that of the sliding rods, and the extrusion frames are connected into the adjacent connecting rings in a sliding mode. The sliding rod is limited, so that the middle of the lower side spring wall does not deform any more, the situation that the lower side spring wall is affected by the gravity of an oil pipe and the oil pipe integrally moves downwards is prevented, and therefore the situation that large stones on the lower side in the well wall directly make contact and rub with the oil pipe, the oil pipe is damaged, and then the exploitation efficiency of an oil well is affected is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of centralizers, and in particular to a variable diameter oil pipe centralizer. Background Art

[0002] The tubing centralizer is an indispensable tool in oil drilling and completion operations. Its main function is to ensure that the tubing is centered in the oil well during the drilling process to prevent the tubing from contacting and rubbing with the well wall and causing damage to the tubing. The existing tubing centralizers are divided into elastic centralizers and rigid centralizers. The elastic centralizer wraps the tubing with a circumferentially distributed spring wall to protect the tubing. When the elastic centralizer is placed in the vertical well wall, if an uneven well section appears in the vertical well wall, the elastic centralizer can deform its spring wall to allow the tubing to pass smoothly through the uneven well section without contacting and rubbing with the well wall. However, in the horizontal well section, the existing spring centralizer will be placed horizontally, and the tubing itself is heavy, so it will move downward and squeeze the spring wall on the lower side, causing the lower spring wall to deform and compress, and the tubing will move downward as a whole. If there are impurities such as stones on the lower side of the well wall at this time, the stones will directly contact and rub with the tubing, causing damage to the tubing, thereby affecting the production efficiency of the oil well. Summary of the invention

[0003] In order to overcome the shortcomings pointed out in the above background technology, the present invention provides a variable diameter oil pipe centralizer.

[0004] The technical solution of the present invention is: a variable diameter oil pipe centralizer, comprising: A centralizer body, the centralizer body comprising symmetrically distributed guide rings, symmetrically distributed connecting rings and a plurality of spring walls, wherein the connecting rings are fixedly connected between the symmetrically distributed guide rings, and the spring walls are fixedly connected between the symmetrically distributed guide rings; Sliding rods, the number of which is the same as the number of the spring walls, are fixedly connected to adjacent spring walls and are slidably connected to adjacent connecting rings; Extrusion racks, the number of which is the same as the number of the slide bars, are slidably connected in adjacent connection rings, an elastic member is fixedly connected between the extrusion racks and the adjacent connection rings, an inclined surface is provided at a position of the extrusion racks close to the adjacent slide bars, the extrusion racks are limitedly matched with the adjacent slide bars, and the inclined surface is extrusion-matched with the adjacent slide bars; The gravity trigger frame has the same number as the extrusion frame and is slidably connected in the adjacent connection ring. The gravity trigger frame is slidably matched with the adjacent extrusion frame.

[0005] More preferably, the minimum distance between the spring wall and the axis of the guide ring is A, the radius of the outer circle on the connecting ring is B, and A>B.

[0006] More preferably, the slidable distance of the extrusion frame toward the adjacent sliding rod is variable X, the minimum distance between the inclined surface and the adjacent sliding rod is variable Y, and X is always greater than Y.

[0007] More preferably, it also includes: wedge blocks, the number of which is the same as that of the gravity trigger frames, fixedly connected to adjacent connecting rings, the wedge blocks being used to guide adjacent gravity trigger frames; The number of guide frames is the same as that of the gravity trigger frames. The guide frames are fixed in adjacent connecting rings, and the gravity trigger frames slide in adjacent guide frames.

[0008] More preferably, a limiting portion is provided on the guide frame, and the limiting portion cooperates with the adjacent gravity trigger frame in limiting manner.

[0009] More preferably, the height of the wedge block is H, the projection length of the inclined surface on the vertical plane is L, and L=2H.

[0010] More preferably, it also includes: The guide frames, the number of which is the same as the number of the spring walls, are fixedly connected to adjacent spring walls at positions close to their travel direction.

[0011] More preferably, the distance between the guide frame and the guide ring axis gradually increases from the connection point close to the adjacent connecting ring to the distance away, so as to guide large impurities to both sides of the guide frame and guide small impurities to the middle of the guide frame.

[0012] More preferably, it also includes: The elastic strips, the number of which is the same as the number of the spring walls, are fixed between two adjacent guide rings, and the elastic strips are located between two adjacent spring walls.

[0013] More preferably, a plurality of grooves are provided on a side of the elastic strip away from the axis of the guide ring to increase the friction force on the surface of the elastic strip.

[0014] The beneficial effects achieved by the present invention using the above structure are as follows: 1. The present invention limits the sliding rod so that the middle part of the lower spring wall no longer deforms, thereby preventing the lower spring wall from being deformed by the gravity of the oil pipe, causing the oil pipe to move downward as a whole, thereby preventing large rocks on the lower side of the well wall from directly contacting and rubbing with the oil pipe, causing damage to the oil pipe, and further affecting the production efficiency of the oil well; 2. The gravity trigger frame is limited by the limiting part. The gravity trigger frame will be triggered only after the spring wall is squeezed and deformed by the protrusion, so as to avoid the gravity trigger frame being accidentally touched and moved, which will affect the stability of the device; 3. The gravity trigger frame moves along the inclined surface of the wedge block, so that the gravity trigger frame drives the inclined surface to move through the extrusion frame, changes the contact point between the inclined surface and the slide bar, and increases the movable distance of the slide bar to twice the original distance. The deformable amount of the middle part of the spring wall is increased to twice the original amount. After the lower spring wall is a hard support, the overall deformable amount of the device is still guaranteed. 4. Use the guide frame to guide the large stone to the elastic strip to prevent the spring wall from being damaged when the size of the large stone exceeds the deformable amount of the spring wall. Use the elastic strip to wrap the large stone, and the elastic strip drives the large stone to move forward to prevent the oil pipe from contacting the large stone during movement, causing the oil pipe to be scratched by the large stone. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the guide ring of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the guide ring, the connecting ring and the spring wall of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the elastic strip of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the wedge block of the present invention; Figure 6 It is a three-dimensional structural cross-sectional view of the connecting ring and the gravity trigger frame of the present invention.

[0016] The marks in the accompanying drawings are: 1. stabilizer body, 101. guide ring, 102. connecting ring, 103. spring wall, 201. slide rod, 301. extrusion frame, 3011. inclined plane, 401. gravity trigger frame, 501. wedge block, 502. guide frame, 5021. limit part, 601. guide frame, 701. elastic strip. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0018] In order to solve the problem that the elastic centralizer may cause tubing deflection when used in horizontal wells, the present invention provides a variable diameter tubing centralizer, such as Figure 1-Figure 5As shown, the centralizer body 1 includes guide rings 101 symmetrically distributed up and down, connecting rings 102 symmetrically distributed left and right, and a plurality of spring walls 103. The spring walls 103 gradually move away from the oil pipe from both ends to the middle. After a bulge appears in the oil well, the centralizer body 1 can smoothly pass through the bulge in the oil well through the deformation of the spring walls 103. The connecting rings 102 are fixedly connected between the symmetrically distributed guide rings 101. The spring walls 103 are fixedly connected between the symmetrically distributed guide rings 101. The guide rings 101 are composed of two mutually engaged semicircular rings for easy fixation on the oil pipe. The minimum distance between the spring wall 103 and the axis of the guide ring 101 is A, and the radius of the outer circle on the connecting ring 102 is B. A> B, so that after the spring wall 103 is compressed to the limit state, the connecting ring 102 does not block the adjacent spring wall 103 to ensure the maximum deformation of the spring wall 103; the sliding rods 201, the number of which is the same as the number of the spring walls 103, are fixedly connected to the adjacent spring walls 103, and are slidably connected to the adjacent connecting rings 102; the extrusion frame 301, the number of which is the same as the number of the sliding rods 201, is slidably connected to the adjacent connecting rings 102, the lower part of the extrusion frame 301 is a trapezoidal block with a notch, and an elastic member is fixedly connected between the extrusion frame 301 and the adjacent connecting ring 102, wherein the elastic member is a spring, and in the initial state, the gravity trigger frame 401 is inserted into the adjacent extrusion frame 301, and the spring is in a compressed and stored state at this time, and the extrusion frame 301 is close to The position of the adjacent slide bar 201 is provided with an inclined surface 3011, and the extrusion frame 301 is limited and matched with the adjacent slide bar 201 through its notch. The inclined surface 3011 is pressed and matched with the adjacent slide bar 201. When the gravity trigger frame 401 is no longer inserted into the adjacent extrusion frame 301, the elastic member of the extrusion frame 301 pops out and drives it to move downward, and the inclined surface 3011 squeezes the adjacent slide bar 201. The notch of the extrusion frame 301 clamps the adjacent slide bar 201. The extrusion frame 301 is used to limit the adjacent slide bar 201. The slidable distance of the extrusion frame 301 in the direction of the adjacent slide bar 201 is the variable X, and the minimum distance between the inclined surface 3011 and the adjacent slide bar 201 is the variable Y. X is always greater than Y, which is used to enable the notch of the extrusion frame 301 to move Until it contacts the adjacent sliding rod 201, thereby limiting the adjacent sliding rod 201; the gravity trigger frame 401, the number of which is the same as the number of the extrusion frame 301, is slidably connected in the adjacent connecting ring 102, and the connecting ring 102 is provided with an external sliding groove not shown in the figure. In this embodiment, the gravity trigger frame 401 slides in the adjacent connecting ring 102 through the external sliding groove, the left part of the gravity trigger frame 401 is a counterweight part, and the right part is a wedge-shaped part. The extrusion frame 301 is provided with a hole, and the wedge-shaped part of the gravity trigger frame 401 is inserted into the hole of the adjacent extrusion frame 301, and the wedge-shaped part of the gravity trigger frame 401 is slidably matched with the hole of the adjacent extrusion frame 301, and the gravity trigger frame 401 is used to lock and unlock the extrusion frame 301.

[0019] Working principle: When the operator needs to use the device to straighten the oil pipe, the operator fixes the device on the oil pipe through the guide ring 101, and then places the device and the oil pipe into the oil well. The initial section of the oil well is generally a vertical well. At this time, if there is a protrusion on the well wall, the spring wall 103 is squeezed and deformed by the protrusion, and the spring wall 103 drives the slide bar 201 to slide to prevent the protrusion from contacting and squeezing the oil pipe, causing damage to the oil pipe. If the oil pipe enters a horizontal well (the following takes the example that the center of one of the spring walls 103 is located directly below the axis of the guide ring 101), the lower slide bar 201 becomes vertically placed. When there is a protrusion on the lower side of the inner wall of the horizontal well (the placement state of the device is Figure 1 After the main view is rotated 90°), the gravity trigger frame 401 located on the lower side moves downward due to its own gravity, so that the wedge-shaped part of the gravity trigger frame 401 loses contact with the hole of the extrusion frame 301, and the elastic part of the extrusion frame 301 pops out and drives it to move, and the inclined surface 3011 squeezes the slide bar 201, and the slide bar 201 moves to the initial state. The notch of the extrusion frame 301 moves to contact the slide bar 201, so that the extrusion frame 301 supports the slide bar 201, and the slide bar 201 cannot move. The middle part of the spring wall 103 no longer deforms, preventing the lower spring wall 103 from being deformed due to the gravity of the oil pipe, causing the oil pipe to move downward as a whole, thereby avoiding the large protrusion on the lower side of the well wall from directly contacting and rubbing with the oil pipe, causing damage to the oil pipe, and further affecting the production efficiency of the oil well.

[0020] In the above embodiment, the gravity trigger frame 401 slides in the adjacent connecting ring 102 through the external sliding groove. In the following embodiment, the gravity trigger frame 401 slides in the adjacent connecting ring 102 through the adjacent guide frame 502.

[0021] Through the above embodiment, the spring wall at the lower side can provide rigid support for the oil pipe after entering the horizontal well. If a bulge appears on the lower side of the horizontal well, the oil pipe will move upward as a whole. In order to increase the deformation of the upper spring wall to prevent the centralizer from being unable to pass through the bulge smoothly due to insufficient overall deformation, as shown in FIG. Figure 5 and Figure 6As shown, it also includes: wedge blocks 501, the number of which is the same as the number of gravity trigger frames 401, which are fixed in the adjacent connecting rings 102, and the wedge blocks 501 are used to guide the adjacent gravity trigger frames 401; guide frames 502, the number of which is the same as the number of gravity trigger frames 401, the guide frames 502 are fixed in the adjacent connecting rings 102, and the gravity trigger frames 401 slide in the adjacent guide frames 502, the guide frames 502 are provided with horizontal grooves and inclined grooves, and the guide frames 502 are provided with a limiting portion 5021, the limiting portion 5021 is located at the lower side of the horizontal groove, and the limiting portion 5021 is limitedly matched with the adjacent gravity trigger frame 401, so that the gravity trigger frame 401 needs to move upward first before it can slide on the horizontal groove, so that the spring wall 10 The gravity trigger frame 401 will be triggered only after encountering a protrusion and being compressed, so as to avoid the gravity trigger frame 401 being accidentally triggered and moving, which will affect the stability of the device. The height of the wedge block 501 is H, and the projection length of the inclined surface 3011 on the vertical plane is L, L=2H. In the horizontal well section, after the upper gravity trigger frame 401 moves along the inclined surface side of the adjacent wedge block 501, the contact point between the slide bar 201 and the adjacent inclined surface 3011 changes from the middle of the inclined surface 3011 to the position close to the oil pipe, so that the movable distance of the upper slide bar 201 increases to twice the original distance, thereby making the displacement of the middle part of the upper spring wall 103 twice the original distance. After the lower spring wall 103 is a hard support, the overall deformability of the device is still guaranteed.

[0022] When the device enters the horizontal well section, there is a protrusion on the lower side of the well wall of the horizontal well, and the lower spring wall 103 is squeezed and deformed by the protrusion. The lower spring wall 103 squeezes the inclined surface 3011 through the sliding rod 201, so that the lower extrusion frame 301 moves in the direction away from the sliding rod 201, and the lower gravity trigger frame 401 disengages from the limiting portion 5021, and then the lower gravity trigger frame 401 moves downward along the horizontal groove of the guide frame 502, and the wedge-shaped portion of the lower gravity trigger frame 401 loses contact with the hole of the extrusion frame 301, and the elastic part of the lower extrusion frame 301 pops out and drives it to move, and the lower inclined surface 3011 repeats the steps of the above embodiment to squeeze the sliding rod 201 and make the middle part of the spring wall 103 no longer deformed, so that the gravity trigger frame 401 will be triggered only after the spring wall 103 encounters the protrusion and is compressed, so as to avoid the gravity trigger frame 401 being accidentally triggered and moving, which affects the stability of the device.

[0023] When there is a protrusion on the upper side of the horizontal well section, the upper spring wall 103 squeezes the inclined surface 3011 through the slide bar 201, so that the upper extrusion frame 301 moves in the direction of the gravity trigger frame 401, and the upper gravity trigger frame 401 breaks away from the limiting portion 5021. The upper gravity trigger frame 401 can move along the inclined groove of the guide frame 502. After the upper gravity trigger frame 401 moves along the inclined surface side of the wedge block 501, the upper gravity trigger frame 401 drives the inclined surface 3011 to move upward through the extrusion frame 301, and the contact point between the upper inclined surface 3011 and the slide bar 201 changes from the middle to close to the oil pipe, so that the movable distance of the upper slide bar 201 increases to twice the original distance, thereby making the displacement of the middle part of the upper spring wall 103 twice the original distance. After the lower spring wall 103 is a rigid support, the overall deformable amount of the device is still guaranteed.

[0024] In order to solve the problem that when the size of the protrusion is larger than the deformable amount of the spring wall, the spring wall will be damaged due to excessive force, such as Figure 1-Figure 4 As shown, it also includes: guide frames 601, the number of which is the same as the number of spring walls 103, fixedly connected to the lower part of the adjacent spring wall 103, the shape of the guide frame 601 is approximately V-shaped, and the wider part is located in the middle of the spring wall 103, and the narrower part is located in the lower part of the spring wall 103, and the distance between the guide frame 601 and the axis of the guide ring 101 gradually increases from bottom to top, so as to guide large impurities to both sides of the guide frame 601, and guide small impurities to the middle of the guide frame 601.

[0025] like Figure 1-Figure 4 As shown, it also includes: elastic strips 701, the number of which is the same as the number of spring walls 103, fixed between two adjacent guide rings 101, the elastic strip 701 is located between two adjacent spring walls 103, and a plurality of grooves are provided on the side of the elastic strip 701 away from the axis of the guide ring 101, which are used to increase the friction force on the surface of the elastic strip 701, so that large stones are driven to move forward through the elastic strip 701, preventing the oil pipe from contacting the large stones during movement, causing the oil pipe to be scratched by the large stones, and the middle part of the elastic strip 701 is concave in the direction of the oil pipe, which is used to wrap impurities.

[0026] When the device moves in the oil well, small stones enter the middle part of the V-shape on the guide frame 601, while large stones are blocked by the guide frame 601 and move to both sides. The small stones can squeeze the spring wall 103, causing the spring wall 103 to deform. The large stones are guided by the guide frame 601 to the elastic strips 701 on both sides to prevent the size of the large stones from exceeding the deformable amount of the spring wall 103 and crushing the spring wall 103. The large stones are wrapped by the elastic strips 701, and the elastic strips 701 drive the large stones to move forward to prevent the oil pipes from contacting the large stones during the movement, causing the oil pipes to be scratched by the large stones.

[0027] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A variable diameter tubing centralizer, comprising: A centralizer body (1), the centralizer body (1) comprising symmetrically distributed guide rings (101), symmetrically distributed connecting rings (102) and a plurality of spring walls (103), wherein the connecting rings (102) are fixedly connected between the symmetrically distributed guide rings (101), and the spring walls (103) are fixedly connected between the symmetrically distributed guide rings (101); Sliding rods (201), the number of which is the same as the number of the spring walls (103), are fixedly connected to adjacent spring walls (103) and are slidably connected to adjacent connecting rings (102); Extrusion frames (301), the number of which is the same as the number of the slide bars (201), are slidably connected in the adjacent connecting rings (102), an elastic member is fixedly connected between the extrusion frames (301) and the adjacent connecting rings (102), an inclined surface (3011) is provided on the extrusion frames (301) near the adjacent slide bars (201), the extrusion frames (301) are limitedly matched with the adjacent slide bars (201), and the inclined surface (3011) is extrusion-matched with the adjacent slide bars (201); The gravity trigger frames (401) are the same in number as the extrusion frames (301) and are slidably connected in adjacent connection rings (102). The gravity trigger frames (401) are slidably matched with adjacent extrusion frames (301).

2. A variable diameter tubing centralizer according to claim 1, characterized in that: The minimum distance between the spring wall (103) and the axis of the guide ring (101) is A, the radius of the outer circle on the connecting ring (102) is B, and A>B.

3. A variable diameter oil pipe centralizer according to claim 1, characterized in that: The slidable distance of the extrusion frame (301) in the direction of the adjacent sliding rod (201) is a variable X, and the minimum distance between the inclined surface (3011) and the adjacent sliding rod (201) is a variable Y, and X is always greater than Y.

4. A variable diameter oil pipe centralizer according to claim 2, characterized in that include: wedge blocks (501), the number of which is the same as the number of the gravity trigger frames (401), fixedly connected to the adjacent connecting rings (102), the wedge blocks (501) being used to guide the adjacent gravity trigger frames (401); The number of guide frames (502) is the same as the number of the gravity trigger frames (401). The guide frames (502) are fixedly connected to the adjacent connecting rings (102), and the gravity trigger frames (401) slide in the adjacent guide frames (502).

5. A variable diameter oil pipe centralizer according to claim 4, characterized in that: A limiting portion (5021) is provided on the guide frame (502), and the limiting portion (5021) cooperates with the adjacent gravity trigger frame (401) in limiting manner.

6. A variable diameter oil pipe centralizer according to claim 4, characterized in that: The height of the wedge block (501) is H, and the projection length of the inclined surface (3011) on the vertical plane is L, where L=2H.

7. A variable diameter oil pipe centralizer according to claim 2, characterized in that include: The guide frames (601) are the same in number as the spring walls (103) and are fixedly connected to adjacent spring walls (103) at positions close to their travel direction.

8. A variable diameter oil pipe centralizer according to claim 7, characterized in that: The distance between the axis of the guide frame (601) and the guide ring (101) gradually increases from a connection point close to the adjacent connecting ring (102) to a point far away, so as to guide large impurities to both sides of the guide frame (601) and guide small impurities to the middle of the guide frame (601).

9. A variable diameter oil pipe centralizer according to claim 7, characterized in that include: The elastic strips (701) are the same in number as the spring walls (103) and are fixed between two adjacent guide rings (101). The elastic strips (701) are located between two adjacent spring walls (103).

10. A variable diameter oil pipe centralizer according to claim 9, characterized in that: A plurality of grooves are provided on a side of the elastic strip (701) away from the axis of the guide ring (101), for increasing the friction force on the surface of the elastic strip (701).

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