Bidirectional sealing grading well cementation device

Abstract

The utility model discloses a bi-directional sealing grading well cementation device which comprises a grading cementing device and a well cementation rubber plug, a plurality of circulating holes are formed in the grading cementing device, a fixing disc is installed in the grading cementing device in a sliding mode, a cylinder is fixedly installed at one end of the fixing disc, and a sealing ring is installed on the cylinder. A top plate is fixedly installed at the end, away from the fixing disc, of the cylinder, a fixing ring is fixedly installed in the grading cementing device, a baffle is fixedly installed on the inner ring of the fixing ring, a conical block is fixedly installed at one end of the well cementation rubber plug, and a positioning column is fixedly installed at the end, away from the well cementation rubber plug, of the conical block. The cylinder is provided with a positioning assembly used for locking the positioning column. The staged cementing device has the advantages that the staged cementing device is convenient to open through mutual matching of the fixing disc, the cylinder, the top plate, the fixing ring and the baffle, so that staged cementing is realized, and well cementing construction operation is smoothly completed.

Description

Technical Field

[0001] The utility model relates to the field of cementing devices, in particular to a bidirectional sealing and grading cementing device. Background Art

[0002] With the development of drilling technology, the depth of mining wells has increased, and the complexity of underground conditions and the difficulty of oil and gas mining have gradually increased. For oil wells with oil and gas reservoirs under leaky layers or low-pressure formations, in order to safely and effectively develop oil and gas and reduce the risk of rig load bearing, the existing method is to adopt tail pipe cementing technology. In order to ensure cementing safety and cementing quality, the existing method is to adopt a graded cementing method.

[0003] The existing tools have a complex structure and may cause the staged cementer to fail to open during use, thus resulting in cementing failure. Utility Model Content

[0004] The utility model aims to solve the following shortcomings in the prior art and proposes a bidirectional sealing graded cementing device.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A bidirectional sealed graded cementing device comprises a graded cementing device and a cementing plug, the graded cementing device is provided with a plurality of circulation holes, a fixed disk is slidably installed in the graded cementing device, a cylinder is fixedly installed at one end of the fixed disk, and a top plate is fixedly installed at the end of the cylinder away from the fixed disk; a fixed ring is fixedly installed in the graded cementing device, a baffle is fixedly installed on the inner ring of the fixed ring, and one end of the top plate is in contact with the middle part of the baffle; a conical block is fixedly installed at one end of the cementing plug, a positioning column is fixedly installed at the end of the conical block away from the cementing plug, a positioning assembly for locking the positioning column is provided on the cylinder, and elastic rods are fixedly installed on both side surfaces of the top plate, one end of the elastic rods is in contact with the inner wall of the inner ring of the fixed ring, and the sum of the lengths of the two elastic rods is greater than the inner diameter of the fixed ring.

[0007] In order to better achieve the above purpose, the utility model adopts a further technical solution: a fracture groove is opened in the middle part of the baffle, and one end of the top plate is inserted into the fracture groove.

[0008] In order to better achieve the above-mentioned purpose, the utility model adopts a further technical solution: a conical groove is provided on the surface of the fixed disk, a cylindrical groove is provided on the inner wall of the conical groove, one end of the cylindrical groove extends to the inside of the cylinder, and mounting grooves are symmetrically provided on the inner wall of the cylindrical groove. The positioning assembly includes two trapezoidal blocks respectively slidably installed in the two mounting grooves, two spring rods respectively fixedly installed on the two trapezoidal blocks, and a triangular cone fixedly installed on one end of the positioning column away from the conical block, one end of the two spring rods is fixedly connected to the inner walls of the two mounting grooves, an annular positioning groove is provided on the positioning column, and an annular clamping groove is provided on the inner wall of the inner ring of the fixing ring.

[0009] In order to better achieve the above purpose, the utility model adopts a further technical solution: a resistance groove is provided at one end of the cementing rubber plug.

[0010] In order to better achieve the above purpose, the utility model adopts a further technical solution: a sealing ring is fixedly installed at one end of the cementing rubber plug, and the sealing ring is made of rubber material.

[0011] The utility model has the advantages that the mutual cooperation among the fixed disk, the cylinder, the top plate, the fixed ring and the baffle plate facilitates the opening of the graded cementing device, thereby realizing graded cementing and facilitating the smooth completion of cementing construction operations; the mutual cooperation among the conical block, the positioning column, the conical groove, the cylindrical groove, the mounting groove, the positioning assembly and the positioning groove facilitates the tight connection between the fixed disk and the fixed ring, thereby preventing the fixed disk from moving to the left and simultaneously limiting the cementing plug. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic cross-sectional view of the structure of the utility model staged cementing device;

[0013] Figure 2 It is a cross-sectional structural schematic diagram of the utility model of the staged cementing device and cementing plug;

[0014] Figure 3 It is a schematic diagram of a partial three-dimensional cross-section structure of the utility model staged cementing device;

[0015] Figure 4 It is a three-dimensional structural schematic diagram of the cementing plug of the utility model;

[0016] Figure 5 for Figure 2 A magnified view of the structure in the middle.

[0017] In the figure: 1 a staged cementing device, 2 a cementing plug, 3 a circulation hole, 4 a fixing plate, 5 a cylinder, 6 a top plate, 7 a fixing ring, 8 a baffle, 9 a conical block, 10 a positioning column, 11 an elastic rod, 12 a trapezoidal block, 13 a spring rod, 14 a triangular cone, 15 a sealing ring, 16 a resistance groove, 17 a cylindrical groove, 18 a mounting groove, 19 a positioning groove, and 20 a card groove. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0019] Reference Figure 1-Figure 5 As shown, a bidirectional sealed graded cementing device comprises a graded cementing device 1 and a cementing plug 2. The graded cementing device 1 is provided with a plurality of circulation holes 3. A fixed disk 4 is slidably installed in the graded cementing device 1. A cylinder 5 is fixedly installed at one end of the fixed disk 4. A top plate 6 is fixedly installed at the end of the cylinder 5 away from the fixed disk 4. The fixed disk 4 blocks the plurality of circulation holes. A fixed ring 7 is fixedly installed in the graded cementing device 1. A baffle 8 is fixedly installed at the inner ring of the fixed ring 7. One end of the top plate 6 is in contact with the middle part of the baffle 8. A conical block 9 is fixedly installed at one end of the cementing plug 2. A positioning column 10 is fixedly installed at the end of the conical block 9 away from the cementing plug 2. The cylinder 5 is provided with a A positioning assembly for locking the positioning column 10, a conical groove is provided on the surface of the fixing plate 4, a cylindrical groove 17 is provided on the inner wall of the conical groove, one end of the cylindrical groove 17 extends to the inside of the cylinder 5, and a mounting groove 18 is symmetrically provided on the inner wall of the cylindrical groove 17. The positioning assembly includes two trapezoidal blocks 12 respectively slidably installed in the two mounting grooves 18, two spring rods 13 respectively fixedly installed on the two trapezoidal blocks 12, and a triangular cone 14 fixedly installed on the end of the positioning column 10 away from the conical block 9, one end of the two spring rods 13 is fixedly connected to the inner walls of the two mounting grooves 18, an annular positioning groove 19 is provided on the positioning column 10, and an annular clamping groove 20 is provided on the inner wall of the inner ring of the fixing ring 7.

[0020] When in use, the graded cementing device 1 is lowered into the predetermined position in the well along with the casing string, and then cementing fluid is injected. The cementing fluid will exert pressure on the fixed disk 4, so that the top plate 6 will exert pressure on the baffle 8. When the pressure of the cementing fluid is greater than the supporting force of the baffle 8, the baffle 8 will be broken, and the fixed disk 4 will move toward the fixed ring 7. The cylinder 5 fixedly installed on the fixed disk 4 will be inserted into the fixed ring 7, so that the fixed disk 4 will no longer block the circulation hole 3, thereby leaking the circulation hole 3 and allowing the circulating drilling fluid to circulate, and then the secondary cementing operation is carried out; the degradable cementing plug 2 is placed in the casing, and the plugging fluid is used as the post-filling fluid to push the cementing plug 2 to move toward the fixed disk 4, thereby driving the conical block 9 to move into the conical groove, and the positioning column 10 will be inserted into the cylindrical groove 17. During the insertion process of the positioning column 10, the triangular cone One end of 14 will contact the inclined ends of the two trapezoidal blocks 12, thereby driving the two trapezoidal blocks 12 away from each other, the spring rod 13 is compressed, and when the trapezoidal blocks 12 move away from each other, they will just be inserted into the slot 20 opened in the inner ring of the fixing ring 7. When the positioning column 10 is fully inserted into the cylindrical groove 17, the positioning slot 19 opened on the positioning column 10 will just move to the two trapezoidal blocks 12. At this time, under the action of the elastic force of the spring rod 13, one end of the two trapezoidal blocks 12 will be inserted into the positioning slot 19, so that the cementing plug 2 is limited to the fixing plate 4 through the two positioning blocks, and the fixing plate 4 is limited to the fixing ring 7, so that the fixing plate 4 cannot move to the left, and at the same time, the cementing plug 2 is limited, which is convenient for the staged cementing device 1 to be opened, thereby realizing staged cementing and facilitating the smooth completion of the cementing construction operation.

[0021] Elastic rods 11 are fixedly installed on both side surfaces of the top plate 6, one end of the elastic rod 11 contacts the inner wall of the inner ring of the fixing ring 7, the sum of the lengths of the two elastic rods 11 is greater than the inner diameter of the fixing ring 7, when the baffle 8 has not broken, the elastic rod 11 is in the inner ring of the fixing ring 7, at this time the elastic rod 11 is deformed and bent, under the action of the elastic force of the elastic rod 11, the cylinder 5 will be limited in the inner ring of the fixing ring 7, and when the cylinder 5 is subjected to pressure, the elastic rod 11 will be driven to move until the elastic rod 11 moves out of the inner ring of the fixing ring 7, at this time the elastic rod 11 returns to its original state, and the cylinder 5 will be prevented from moving out of the inner ring of the fixing ring 7 under the obstruction of the two elastic rods 11.

[0022] A fracture groove is provided in the middle of the baffle plate 8, and one end of the top plate 6 is inserted into the fracture groove. Under the action of the fracture groove, when the top plate 6 is subjected to pressure, the baffle plate 8 can be fractured.

[0023] A resistance groove 16 is provided at one end of the cementing plug 2, and a sealing ring 15 is fixedly installed at one end of the cementing plug 2. The sealing ring 15 is made of rubber. The resistance groove 16 can increase the contact area between the plugging fluid and the cementing plug 2. At the same time, under the action of the sealing ring 15, it is easy to push the cementing plug 2 to move.

[0024] When in use, the graded cementing device 1 is lowered into the predetermined position in the well along with the casing string, and then cementing fluid is injected. The cementing fluid will exert pressure on the fixed disk 4, so that the top plate 6 will break the baffle 8. At this time, the fixed disk 4 will move toward the fixed ring 7, thereby leaking the circulation hole 3, allowing the circulating drilling fluid to circulate. After that, the secondary cementing operation is carried out, and the degradable cementing plug 2 is placed in the casing, and the cementing plug 2 is pushed to move toward the fixed disk 4 with the plugging fluid, and then the fixed disk 4 is limited on the fixed ring 7 by the positioning component, so that the fixed disk 4 cannot move to the left, and at the same time, the cementing plug 2 is limited, which is convenient for the graded cementing device 1 to open, realize graded cementing, and facilitate the smooth completion of the cementing construction operation.

Claims

1. A bidirectional sealed graded cementing device, comprising a graded cementing device (1) and a cementing plug (2), It is characterized in that The graded cementing device (1) is provided with a plurality of circulation holes (3); a fixed disk (4) is slidably mounted in the graded cementing device (1); a cylindrical body (5) is fixedly mounted on one end of the fixed disk (4); a top plate (6) is fixedly mounted on the end of the cylindrical body (5) away from the fixed disk (4); a fixed ring (7) is fixedly mounted in the graded cementing device (1); a baffle (8) is fixedly mounted on the inner ring of the fixed ring (7); a middle portion between one end of the top plate (6) and the baffle (8) contact; a conical block (9) is fixedly mounted on one end of the cementing plug (2); a positioning column (10) is fixedly mounted on the end of the conical block (9) away from the cementing plug (2); a positioning assembly for locking the positioning column (10) is provided on the cylindrical body (5); elastic rods (11) are fixedly mounted on both side surfaces of the top plate (6); one end of the elastic rods (11) is in contact with the inner wall of the inner ring of the fixing ring (7); and the sum of the lengths of the two elastic rods (11) is greater than the inner diameter of the fixing ring (7).

2. A bidirectional sealing and graded cementing device according to claim 1, It is characterized in that A fracture groove is provided in the middle of the baffle plate (8), and one end of the top plate (6) is inserted into the fracture groove.

3. A bidirectional sealing and graded cementing device according to claim 1, It is characterized in that The surface of the fixing plate (4) is provided with a conical groove, the inner wall of the conical groove is provided with a cylindrical groove (17), one end of the cylindrical groove (17) extends into the interior of the cylinder (5), the inner wall of the cylindrical groove (17) is symmetrically provided with mounting grooves (18), the positioning assembly comprises two trapezoidal blocks (12) respectively slidably mounted in the two mounting grooves (18), two spring rods (13) respectively fixedly mounted on the two trapezoidal blocks (12), and a triangular cone (14) fixedly mounted on one end of the positioning column (10) away from the conical block (9), one end of the two spring rods (13) is respectively fixedly connected to the inner walls of the two mounting grooves (18), the positioning column (10) is provided with an annular positioning groove (19), and the inner wall of the inner ring of the fixing ring (7) is provided with an annular clamping groove (20).

4. A bidirectional sealing and graded cementing device according to claim 1, It is characterized in that A resistance groove (16) is provided at one end of the cementing rubber plug (2).

5. A bidirectional sealing and graded cementing device according to claim 1, It is characterized in that A sealing ring (15) is fixedly mounted on one end of the cementing rubber plug (2), and the sealing ring (15) is made of rubber.

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