Gravel packing tool for horizontal well

Abstract

The utility model relates to a horizontal well gravel packing tool which comprises an oil pipe, a well mouth casing pipe, a grading hoop and roller centralizers, the oil pipe is arranged in a horizontal well, a plurality of groups of roller centralizers contacted with the inner wall of the horizontal well are arranged on the outer wall of the oil pipe at intervals, and one end, located in the horizontal well, of the oil pipe is connected with a gravel packing mechanism. A grading hoop is arranged at the position, located at a wellhead of the horizontal well, of the oil pipe, and a wellhead sleeve is arranged at the top of the grading hoop. The utility model relates to the technical field of oilfield exploitation equipment. According to the gravel filling tool for the horizontal well, the gravel filling mechanism is arranged, so that gravels can be quickly and efficiently filled in the horizontal well, the gravels uniformly surround the periphery of the conveying pipe, and the situation that the gravels are mixed into petroleum and discharged together at weak positions of the gravels due to uneven filling of the gravels can be effectively avoided; therefore, the extraction quality of petroleum is effectively ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of oilfield mining equipment, in particular to a horizontal well gravel filling tool. Background Art

[0002] Sand control refers to the measures to correctly select cementing and completion methods, formulate reasonable production measures, control production pressure difference, limit seepage velocity and prevent sand blockage according to the conditions of oil layers and oil wells during oil production. The mechanical sand control method is gravel filling of pipe strings, that is, after inserting mechanical pipe strings such as wire screens or slotted liners into the wellbore, gravel or other similar materials are filled in the annular space between the mechanical pipe string and the feed pipe, and squeezed into the formation around the wellbore to form a multi-stage sand filter barrier to achieve the purpose of sand blocking.

[0003] In the prior art, when a horizontal well is filled, gravel will gather at the bottom of the horizontal well due to gravity, resulting in a poor gravel filling effect at the top of the filling tool, thereby affecting the sand filtering effect at the top of the filling tool, causing sand and gravel to mix into the oil, resulting in a large amount of impurities in the produced oil, affecting the oil quality. Utility Model Content

[0004] According to the deficiencies in the prior art, the purpose of the present invention is to provide a horizontal well gravel packing tool so as to solve the technical problems mentioned in the above background technology.

[0005] The above technical objectives of the utility model are achieved through the following technical solutions:

[0006] A horizontal well gravel packing tool comprises an oil pipe, a wellhead casing, a grading hoop and a roller centralizer. The oil pipe is arranged in the horizontal well. A plurality of groups of roller centralizers in contact with the inner wall of the horizontal well are arranged at intervals on the outer wall of the oil pipe. A gravel packing mechanism is connected to one end of the oil pipe located in the horizontal well. A grading hoop is arranged at the wellhead of the horizontal well, and a wellhead casing is arranged on the top of the grading hoop.

[0007] Furthermore, the gravel filling mechanism includes a feed pipe, a return water ring, a limit block and an adjusting component, one end of the feed pipe is connected to the oil pipe, the outer wall of the end of the feed pipe away from the oil pipe is provided with a mesh for gravel to pass through, the outer wall of the feed pipe is slidably connected to a place of the mesh with a return water ring, the feed pipe is fixedly connected to a limit block for blocking the return water ring on a side of the mesh away from the oil pipe, and an adjusting component for adjusting the position of the return water ring is provided in the feed pipe.

[0008] Furthermore, the adjustment component includes a slide groove, a connecting plate and an adjustment ring. The outer wall of the feed pipe located at the mesh is provided with a plurality of slide grooves in an annular array. The slide grooves are provided with connecting plates fixedly connected to the return water ring. An adjustment ring is slidably provided in the feed pipe, and the adjustment ring is connected to the connecting plate by a shear pin.

[0009] Furthermore, an inner wall of the slide groove away from the limit block is provided with an angle, so that the slide groove forms a trapezoidal groove that is narrow inside and wide outside, and a bevel is processed on one side of the connecting plate close to the angle, and the inclination angle of the bevel is smaller than the inclination angle of the bevel.

[0010] Furthermore, the inner wall of the adjustment ring gradually expands from left to right, so that the inner wall of the adjustment ring forms a trumpet shape, and the inclination angle of the trumpet-shaped inner wall of the adjustment ring is equal to the inclination angle of the inclined surface of the connecting plate.

[0011] Furthermore, a through groove is provided on one side of the water return ring, and a filter screen is fixedly connected to a side of the through groove close to the limit block.

[0012] In summary, the present invention includes at least one of the following beneficial technical effects:

[0013] 1. This horizontal well gravel packing tool can quickly and efficiently pack gravel in the horizontal well through the gravel packing mechanism, and make the gravel evenly surround the feeding pipe, which can effectively prevent the gravel from being mixed with the oil in the weak part of the gravel due to uneven filling, thereby effectively ensuring the quality of oil extraction;

[0014] 2. The horizontal well gravel packing tool can reciprocately pack gravel layer by layer through the setting adjustment component, which can effectively improve the gravel packing efficiency, reduce the gravel packing difficulty, and ensure the gravel packing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 It is a structural schematic diagram of a horizontal well gravel packing tool of the utility model.

[0017] Figure 2 The utility model is a structural schematic diagram of a gravel packing mechanism in a horizontal well gravel packing tool.

[0018] Figure 3The utility model is a schematic diagram of the internal structure of a gravel packing mechanism in a horizontal well gravel packing tool.

[0019] Figure 4 The utility model is a schematic diagram of the operation of a gravel packing mechanism in a horizontal well gravel packing tool.

[0020] In the figure, 1, oil pipe; 2, wellhead casing; 3, grading hoop; 4, roller centralizer; 5, gravel filling mechanism; 51, feed pipe; 52, return ring; 53, limit block; 54, adjustment component; 541, slide; 542, connecting plate; 543, adjustment ring; 6, bevel; 7, inclined surface; 8, through groove; 9, filter screen. DETAILED DESCRIPTION

[0021] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0022] Example:

[0023] Reference Figure 1 - Figure 4 The utility model discloses a horizontal well gravel packing tool, comprising an oil pipe 1, a wellhead casing 2, a grading hoop 3 and a roller centralizer 4. The oil pipe 1 is arranged in a horizontal well, and a plurality of groups of roller centralizers 4 in contact with the inner wall of the horizontal well are arranged at intervals on the outer wall of the oil pipe 1. A gravel packing mechanism 5 is connected to one end of the oil pipe 1 located in the horizontal well, and a grading hoop 3 is arranged at the wellhead of the horizontal well of the oil pipe 1, and a wellhead casing 2 is arranged on the top of the grading hoop 3.

[0024] In this embodiment, the gravel packing mechanism 5, the roller centralizer 4, the grading hoop 3 and the wellhead casing 2 are sequentially connected to the oil pipe 1, and then the oil pipe 1 is gradually lowered into the well. When the oil pipe 1 is lowered into the well, the roller centralizer 4 contacts the inner wall of the horizontal well, and the oil pipe 1 can be straightened to prevent the oil pipe 1 from bending, which can effectively prevent the oil pipe 1 from contacting and rubbing against the inner wall of the horizontal well.

[0025] After the oil pipe 1 is lowered, liquid containing gravel is input through the oil pipe 1, and then the liquid enters the gravel filling mechanism 5, and then is discharged and filled through the mesh of the outer wall of the gravel filling mechanism 5, and then the gravel is intercepted by the filter screen 9, and the liquid is discharged through the return water ring 52, so that the gravel can be quickly filled, so that the gravel can quickly fill the horizontal well, and the gravel filling efficiency is improved. After the filling is completed, the oil pipe 1 is flushed to remove the gravel remaining in the oil pipe 1, and the gravel filling can be completed.

[0026] In a further preferred embodiment of the present invention, Figure 2 - Figure 4As shown, the gravel filling mechanism 5 includes a feed pipe 51, a return water ring 52, a limit block 53 and an adjusting component 54. One end of the feed pipe 51 is connected to the oil pipe 1, and a mesh for gravel to pass through is provided on the outer wall of the end of the feed pipe 51 away from the oil pipe 1. The return water ring 52 is slidably connected to the outer wall of the feed pipe 51 at a place of the mesh. The feed pipe 51 is fixedly connected to a limit block 53 for blocking the return water ring 52 on a side of the mesh away from the oil pipe 1, and an adjusting component 54 for adjusting the position of the return water ring 52 is provided in the feed pipe 51.

[0027] In this embodiment, a mesh for gravel to pass through is provided on the outer wall of the delivery pipe 51, so that the liquid containing gravel can enter the delivery pipe 51 and then be discharged through the mesh into the horizontal well for filling. Since the water flow will diffuse to the surroundings after being blocked by the delivery pipe 51, the water flow will carry the gravel and be discharged along the periphery of the delivery pipe 51. Then the liquid is separated from the gravel through the return water ring 52, so that the gravel is evenly distributed around the delivery pipe 51, thereby improving the filling efficiency of the gravel and the filling quality of the gravel.

[0028] In a further preferred embodiment of the present invention, Figure 2 - Figure 4 As shown, the adjustment component 54 includes a slide groove 541, a connecting plate 542 and an adjustment ring 543. The outer wall of the feed pipe 51 located at the mesh is provided with a plurality of slide grooves 541 in an annular array. The slide grooves 541 are each provided with a connecting plate 542 fixedly connected to the return water ring 52. An adjustment ring 543 is slidably provided in the feed pipe 51, and the adjustment ring 543 is connected to the connecting plate 542 by a shear pin.

[0029] In this embodiment, after the liquid containing gravel is filtered by the water return ring 52, the gravel will preferentially accumulate near the water return ring 52, resulting in the thickness of the gravel near the water return ring 52 becoming larger and larger, which will increase the difficulty of liquid passing through, slow down the filling efficiency of the gravel, and increase the filling difficulty.

[0030] Therefore, a slide groove 541 is provided on the outer wall of the feed pipe 51 at the mesh, and a connecting plate 542 connected to the return water ring 52 is provided in the slide groove 541, and an adjusting ring 543 is provided in the feed pipe 51, so that the return water ring 52 and the limit block 53 are fitted together when the gravel filling mechanism 5 is in use. Subsequently, when the feed pipe 51 is filled with liquid, the liquid will push the adjusting ring 543 to move due to the obstruction of the feed pipe 51, thereby driving the return water ring 52 away from the limit block 53 through the connecting plate 542, so that a gap is generated between the return water ring 52 and the limit block 53. At this time, the liquid will enter the gap and intercept the gravel through the return water ring 52, so that the gravel is filled in the gap.

[0031] When the gap is filled with gravel, the liquid discharge speed slows down, and then the water pressure will push the adjustment ring 543 to move, so that a gap is generated between the return water ring 52 and the gravel. The gravel is filled layer by layer in this way, which can effectively improve the gravel filling efficiency, reduce the gravel filling difficulty, and ensure the gravel filling quality.

[0032] In a further preferred embodiment of the present invention, Figure 3 - Figure 4 As shown, the inner wall of the slide groove 541 on the side away from the limit block 53 is provided with an angle 6, so that the slide groove 541 forms a trapezoidal groove that is narrow inside and wide outside, and the side of the connecting plate 542 close to the angle 6 is processed with a slope 7, and the inclination angle of the slope 7 is smaller than the inclination angle of the angle 6.

[0033] In this embodiment, by opening an angle 6 in the slide groove 541 and processing the inclined surface 7 on the connecting plate 542, after the gravel filling is completed, the water pressure can be used to push the connecting plate 542 to slide on the angle 6, so that the connecting plate 542 squeezes the return water ring 52 to deform, and the return water ring 52 is used to close the horizontal well.

[0034] When the connecting plate 542 is tilted to make the return ring 52 close the horizontal well, the shear force between the connecting plate 542 and the adjusting ring 543 gradually increases until it exceeds the upper limit of the shear pin. Then, the connection between the adjusting ring 543 and the connecting plate 542 is disconnected, thereby preventing the adjusting ring 543 from interfering with the tilting of the connecting plate 542.

[0035] In a further preferred embodiment of the present invention, Figure 3 As shown, the inner wall of the adjustment ring 543 gradually expands from left to right, so that the inner wall of the adjustment ring 543 forms a trumpet shape, and the inclination angle of the trumpet-shaped inner wall of the adjustment ring 543 is equal to the inclination angle of the inclined surface 7 of the connecting plate 542.

[0036] In this embodiment, by setting the inner wall of the adjusting ring 543 to be trumpet-shaped, and the inclination angle of the trumpet-shaped inner wall is the same as the inclination angle of the inclined surface 7 of the connecting plate 542, a smooth transition can be made between the inclined surface 7 and the trumpet-shaped inner wall after the connecting plate 542 and the adjusting ring 543 are connected, so as to avoid gravel remaining in the chute 541 and affecting the movement of the return water ring 52.

[0037] In a further preferred embodiment of the present invention, Figure 3 As shown, a through groove 8 is provided on one side of the water return ring 52 , and a filter screen 9 is fixedly connected to one side of the through groove 8 close to the limit block 53 .

[0038] In this embodiment, the filter screen 9 can intercept gravel and fill the gravel in the horizontal well, which can effectively improve the filling efficiency of the gravel.

[0039] The embodiments of this specific implementation method are all preferred embodiments of the utility model, and are not intended to limit the protection scope of the utility model. Therefore, all equivalent changes made based on the structure, shape, and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A horizontal well gravel packing tool, comprising an oil pipe (1), a wellhead casing (2), a grading collar (3) and a roller centralizer (4), characterized in that: The oil pipe (1) is arranged in a horizontal well, and a plurality of groups of roller centralizers (4) in contact with the inner wall of the horizontal well are arranged at intervals on the outer wall of the oil pipe (1). One end of the oil pipe (1) located in the horizontal well is connected to a gravel packing mechanism (5). A grading collar (3) is arranged at the wellhead of the horizontal well, and a wellhead casing (2) is arranged on the top of the grading collar (3).

2. A horizontal well gravel packing tool according to claim 1, characterized in that: The gravel filling mechanism (5) comprises a feed pipe (51), a water return ring (52), a stop block (53) and an adjustment component (54); one end of the feed pipe (51) is connected to the oil pipe (1); a mesh for gravel to pass through is arranged on the outer wall of the end of the feed pipe (51) away from the oil pipe (1); a water return ring (52) is slidably connected to the outer wall of the feed pipe (51) at a position of the mesh; a stop block (53) for blocking the water return ring (52) is fixedly connected to the side of the feed pipe (51) located at the mesh away from the oil pipe (1); and an adjustment component (54) for adjusting the position of the water return ring (52) is arranged inside the feed pipe (51).

3. A horizontal well gravel packing tool according to claim 2, characterized in that: The adjustment component (54) comprises a slide groove (541), a connecting plate (542) and an adjustment ring (543); a plurality of slide grooves (541) are provided in a circular array on the outer wall of the feed pipe (51) at the mesh; a connecting plate (542) fixedly connected to the return water ring (52) is provided in each of the slide grooves (541); an adjustment ring (543) is slidably provided in the feed pipe (51); and the adjustment ring (543) is connected to the connecting plate (542) via a shear pin.

4. A horizontal well gravel packing tool according to claim 3, characterized in that: An inner wall of the slide groove (541) on a side away from the limit block (53) is provided with an oblique angle (6), so that the slide groove (541) forms a trapezoidal groove that is narrow inside and wide outside, and a side of the connecting plate (542) close to the oblique angle (6) is processed with an inclined surface (7), and the inclination angle of the inclined surface (7) is smaller than the inclination angle of the oblique angle (6).

5. A horizontal well gravel packing tool according to claim 4, characterized in that: The inner side wall of the adjustment ring (543) gradually expands from left to right, so that the inner wall of the adjustment ring (543) forms a trumpet shape, and the inclination angle of the trumpet-shaped inner wall of the adjustment ring (543) is equal to the inclination angle of the inclined surface (7) of the connecting plate (542).

6. A horizontal well gravel packing tool according to claim 2, characterized in that: A through groove (8) is provided on one side of the water return ring (52), and a filter screen (9) is fixedly connected to a side of the through groove (8) close to the limit block (53).

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