CN107313737A - Double glue core annular preventers - Google Patents

Abstract

A double rubber core annular blowout preventer, which includes: a flange seat, a lower gland, a lower wear ring, a lower outer rubber core, a lower inner rubber core, a lower piston head, a lower mud scraping plate, a lower support frame, a lower Support cylinder, lower piston rod, balance manifold, upper piston rod, upper support cylinder, upper support frame, upper piston head, upper end cover, upper mud scraper, upper gland, upper wear ring, upper outer rubber core, upper Inner rubber core, outer shell, pressure relief manifold, coupling tester. The upper inner rubber core and the lower inner rubber core adopt a briquetting structure, and the external hydraulic system provides hydraulic oil into the space between the upper piston rod, lower piston rod and the outer shell to squeeze the upper outer rubber core and the lower outer rubber core. Make it radially expand, and then make the upper inner rubber core and the lower inner rubber core of the blowout preventer hold the pipe string tightly, and play the role of sealing the annulus of the pipe string. Forced through. The invention can realize the sealing of the wellhead pressure when the pipe string is tripped with pressure under the condition of no snubbing and blowout.

Description

Double Rubber Core Annular BOP

Technical field:

The invention relates to the field of oil field wellhead well control equipment, in particular to a blowout preventer suitable for the working condition of the pipe string under pressure when it is specially used for workover, fracturing, water injection and other operations, and especially relates to a double rubber core annular blowout preventer device.

Background technique:

As a new type of downhole operation technology, snubbing operation can carry out downhole operations such as workover and stimulation measures under the condition of oil and gas pressure in the wellbore. During the snubbing operation, there is no need to circulate and kill hydraulic wells, and no blowout overflow is required. , which shortens the operation cycle and reduces the damage to the formation, protects the productivity of the oil well, and reduces the secondary operation cost after the workover operation of the oil well.

The existing snubbing operation device adopts the spherical rubber core in the annular blowout preventer to tightly hold the inner well tubing string to seal the wellhead when the tubing string is pulled up at the wellhead. The rubber core of the annular blowout preventer leads to serious wear of the rubber core. It is necessary to replace a rubber core for every well operation, and the price of the rubber core is very expensive. Especially in the process of high-pressure workover, the rapid wear of the rubber core increases the occurrence of blowout The possibility of serious threat to the safety of workers.

Invention content:

The purpose of the present invention is to provide a method that overcomes the disadvantages of low working pressure, small working diameter and fast wear of the rubber core of the traditional annular blowout preventer, and realizes that when the pipe string is pulled up without snubbing and blowout, Double rubber core annular blowout preventer for sealing wellhead pressure.

The technical solution adopted in the present invention is: double rubber core annular blowout preventer, which includes a flange seat, a lower gland, a lower wear-resistant ring, a lower outer rubber core, a lower inner rubber core, a lower piston head, a lower mud scraping plate, Lower support frame, lower support cylinder, lower piston rod, balance manifold, upper piston rod, upper support cylinder, upper support frame, upper piston head, upper end cover, upper mud scraper, upper gland, upper wear ring, upper Outer rubber core, upper inner rubber core, outer shell, pressure relief manifold, coupling tester. The upper inner rubber core, the upper outer rubber core, the lower inner rubber core and the lower outer rubber core are symmetrically installed in the outer shell. A wear-resistant ring is installed between the upper inner rubber core and the upper end cover through screws, and a wear-resistant ring is installed between the lower inner rubber core and the flange seat through screws. The upper support cylinder and the lower support cylinder are symmetrically installed in the outer shell through bolts. The upper mud scraper is installed between the upper inner rubber core and the upper support cylinder, and the lower mud scraper is installed between the lower inner rubber core and the lower support cylinder. The upper piston head and the upper piston rod are installed on the lower part of the upper outer rubber core through screw connection, and the lower piston head and the lower piston rod are installed on the upper part of the lower outer rubber core through screw connection. The upper supporting frame is installed between the upper end cover and the outer casing. The upper gland connects the upper end cover and the outer casing together through bolts. The lower supporting frame is installed between the flange seat and the outer casing. The lower gland connects the flange seat and the outer shell through bolts. The balance manifold, pressure relief manifold and coupling detector are installed in the middle of the outer shell.

The flange seat is circular, and the size of the outer circle is consistent with the size of the matching wellhead flange. There are 24 bolt holes evenly distributed in the circumferential direction of the circular flange seat, and a steel ring groove is opened on the lower surface of the circular flange seat. The octagonal ring steel ring is installed, and an "O"-shaped sealing ring is installed between the outer surface of the flange seat and the outer shell to achieve sealing.

24 Φ47 bolt holes are evenly distributed in the circumferential direction of the flange seat.

The inside of the outer casing adopts stepped holes to facilitate the installation and positioning of other parts.

Four flange seats are evenly distributed in the circumferential direction of the outer casing, which are used for installing balance manifolds, pressure relief manifolds and coupling detectors.

The upper inner rubber core and the lower inner rubber core adopt a briquetting structure, and the size of the upper inner rubber core and the lower inner rubber core are the same, so that the radial movement of the skeleton can be ensured during the sealing process, and the internal stress concentration of the rubber core can be reduced at the same time.

The bottom of the upper outer rubber core and the lower outer rubber core adopts a tapered structure, which is convenient for squeezing the upper inner rubber core and the lower inner rubber core during the sealing process.

Both the upper mud scraper and the lower mud scraper are made of rubber material, which can remove oil stains on the surface of the pipe string and reduce damage to the pipe string.

The coupling detector is installed on the flange seat of the outer shell through bolts, and cooperates with the balance manifold and the pressure relief manifold during the operation of the pipe string to realize that the oil pipe coupling does not pass through the rubber core of the annular blowout preventer forcibly, reducing the Little damage to rubber core.

The beneficial effect of the present invention is that the hydraulic oil provided by the external hydraulic system enters the space between the upper piston rod, the lower piston rod and the outer casing, and the radial expansion of the upper and lower outer rubber cores is squeezed, thereby making the blowout prevention The upper inner rubber core and the lower inner rubber core tightly hold the pipe string to seal the annulus of the pipe string. The invention not only has the function of the traditional annular blowout preventer, but also has unique features. One of the features is that when the upper inner rubber core and the lower inner rubber core of the blowout preventer hold the pipe string tightly for lifting operation, the pipe string coupling detector cooperates so that the pipe string coupling does not need to pass through forcibly, reducing the pressure on the upper inner rubber core and the lower inner rubber core. Damage to the lower inner rubber core; the second feature is that the upper inner rubber core and the lower inner rubber core adopt a briquetting structure, and the upper inner rubber core and the lower inner rubber core reduce stress concentration during the sealing process.

Compared with the existing technology, the invention has the advantages of large working diameter, high sealing pressure, can operate under pressure to lift pipe strings, wide application range, long rubber core life and good sealing effect. The rubber core of the double-core annular blowout preventer is made of wear-resistant and high-strength elastic material, which can effectively prolong the service life.

Description of drawings:

Fig. 1: The main sectional view of the double rubber core annular blowout preventer of the present invention

Figure 2: Left sectional view of the double-rubber core annular blowout preventer of the present invention

Figure 3: Schematic diagram of the structure of the inner rubber core in Figure 1

Figure 4: Schematic diagram of the single-section skeleton structure of the inner rubber core in Figure 3

Figure 5: Schematic diagram of the structure of the outer rubber core in Figure 1

Figure 6: Schematic diagram of the structure of the coupling detector in Figure 2

Symbol Description:

1. Flange seat, 2. Lower gland, 3. Lower wear ring, 4. Lower outer rubber core, 5. Lower inner rubber core, 6. Lower piston head, 7. Lower scraper plate, 8. Lower support Frame, 9, lower support cylinder, 10, lower piston rod, 11, balance manifold, 12, upper piston rod, 13, upper support cylinder, 14, upper support frame, 15, upper piston head, 16, upper end cover, 17 , Upper mud scraping plate, 18, Upper gland, 19, Upper wear ring, 20, Upper outer rubber core, 21, Upper inner rubber core, 22, Outer shell, 23, Pressure relief manifold, 24, Coupling detection Instrument, 25, inner rubber core skeleton, 26, rubber material

detailed description:

Below in conjunction with accompanying drawing and example the present invention will be further described:

Example 1

As shown in the main sectional view of the device of the present invention shown in Figure 1, it includes a flange seat (1), a lower gland (2), a lower wear ring (3), a lower outer rubber core (4), a lower inner rubber core (5) ), lower piston head (6), lower mud scraper (7), lower support frame (8), lower support cylinder (9), lower piston rod (10), balance manifold (11), upper piston rod (12 ), upper support cylinder (13), upper support frame (14), upper piston head (15), upper end cover (16), upper mud scraper (17), upper gland (18), upper wear ring (19 ), upper outer rubber core (20), upper inner rubber core (21), outer casing (22), pressure relief manifold (23), coupling detector (24). The upper inner rubber core (21), the upper outer rubber core (20), the lower inner rubber core (5) and the lower outer rubber core (4) are symmetrically installed in the outer shell (22), and the upper inner rubber core (21) and the upper end The upper wear-resistant ring (19) is installed between the covers (18), the lower wear-resistant ring (3) is installed between the lower inner rubber core (5) and the flange seat (1) by screws, and the upper support cylinder (13) It is installed symmetrically with the lower support cylinder (9) in the outer casing (22) through bolts. The contact surfaces of the outer casing (22) and the upper support cylinder (13) and the lower support cylinder (9) are stepped, which is convenient for installation and positioning. The mud scraper (17) is installed between the upper inner rubber core (21) and the upper support cylinder (13), and the lower mud scraper (7) is installed between the lower inner rubber core (5) and the lower support cylinder (9) , the upper piston head (15) and the upper piston rod (12) are installed on the lower part of the upper outer rubber core (20) through screw connection, and the upper outer rubber core (20) is squeezed by the upper piston rod (12) under the action of hydraulic oil The upper and lower inner rubber cores (21) realize sealing, the lower piston head (6) and the lower piston rod (10) are installed on the upper part of the lower outer rubber core (4) through screw connection, and the lower outer rubber core (4) is connected by the lower piston rod ( 10) Squeeze the lower inner rubber core (5) under the action of hydraulic pressure to achieve sealing, the upper support frame (14) is installed between the upper end cover (16) and the outer shell (22), and the outer shell (22) is designed with The stepped hole facilitates the positioning of the upper support frame (14), the upper gland (18) connects the upper end cover (16) and the outer shell (22) together through bolts, and the lower support frame (8) is installed on the flange seat (1) Between the outer shell (22) and the outer shell (22), a stepped hole is designed to facilitate the positioning of the lower support frame (8), and the lower gland (2) connects the flange seat (1) to the outer shell (22) through bolts. connected together.

Example 2

The coupling detector (24) described in the above embodiment is installed as shown in Figure 2, and the balance manifold (11), pressure relief manifold (23) and coupling detector (24) are installed in the middle of the outer shell (22) , the collar detector (24) is connected to the outer casing (22) by bolts.

Example 3

The structure of the upper inner rubber core (21) and the lower inner rubber core (5) described in Example 1 is shown in Figure 3, the upper inner rubber core (21) and the lower inner rubber core (5) adopt a briquetting structure, The inner rubber core skeleton (25) is vulcanized together with the rubber material (26). During the sealing process of the upper inner rubber core (21) and the lower inner rubber core (5), the pressure block slides on the step surface, and the earrings are in the adjacent ear grooves. Slide in the middle to ensure that the rubber will not be extruded along the axial direction.

Example 4

The structure of the inner rubber core frame (25) described in Example 3 is shown in Figure 4. The frame is designed with stepped holes, earrings and ear grooves to ensure concentricity during the movement process.

Example 5

The structure of the upper outer rubber core (20) and the lower outer rubber core (4) described in Example 1 is shown in Figure 5, the bottom of the upper outer rubber core (20) and the lower outer rubber core (4) adopts a tapered structure, It is convenient to squeeze the upper inner rubber core (21) and the lower inner rubber core (5) during the sealing process.

Example 6

The structure of the collar detector (24) described in Embodiment 2 is shown in Figure 6. The collar detector (24) is connected to the outer shell (22) by bolts and adopts a separate structure, which is convenient for installation and replacement.

When in use, the flange seat (1) is connected to the ram blowout preventer through bolts, the upper end cover (16) is connected to the collar detector (24) through bolts, and when the oil pipe is lifted, the inner rubber core (21 ) is in the closed state, and realizes a dynamic seal with the outer diameter of the oil pipe, and the inner rubber core (5) of the annular BOP is in the open state. When the coupling detector (24) inside the device is installed, the lower inner rubber core (5) of the annular BOP is quickly closed, and at the same time the pressure relief manifold (23) is opened to make the upper inner rubber core (21) and the lower inner rubber core (5) The pressure of the high-pressure liquid between them is released quickly, and after the pressure on both sides of the inner rubber core (21) on the annular blowout preventer is balanced, it can be opened smoothly. When the oil pipe coupling passes through the inner rubber core (21) on the annular BOP and touches the coupling detector (24), the inner rubber core (21) on the annular BOP is quickly closed and the balance manifold (11) is opened, The space between the upper inner rubber core (21) and the lower inner rubber core (5) is filled with high-pressure liquid. At this time, the lower inner rubber core (5) of the annular blowout preventer can be opened smoothly while the balance manifold (11) is closed, thereby completing a Hoisting of the tubing. Repeat the above steps for lifting the next oil pipe, and each oil pipe can be safely lifted out of the well. The working principle of lowering the oil pipe is the same as that of lifting the oil pipe, and the action sequence is reversed.

The invention not only has the function of the traditional annular blowout preventer, but also has unique features. First, when the upper inner rubber core (21) and the lower inner rubber core (5) of the blowout preventer hold the oil pipe tightly and go up and down, the oil pipe coupling detector (24) cooperates so that the oil pipe coupling does not need to pass through forcibly, reducing the pressure on the upper The inner rubber core (21) and the lower inner rubber core (5) are damaged; secondly, the upper inner rubber core (21) and the lower inner rubber core (5) adopt a briquetting structure, and the upper inner rubber core (21) and the lower inner rubber core (5) The inner rubber core (5) reduces stress concentration during the sealing process.

Compared with the prior art, the invention has the advantages of large working diameter, high sealing pressure, can be used for lifting and lowering pipe strings under pressure, wide application range, and good sealing effect under pressure. The rubber core of the double-core annular blowout preventer is made of wear-resistant and high-strength rubber material, which can effectively prolong the service life and reduce the occurrence of blowout accidents.

The present invention has been described above by way of examples, but the present invention is not limited to the above specific embodiments, and any changes or modifications made based on the present invention fall within the scope of protection of the present invention.

Claims (9)

1. Double rubber core annular blowout preventer, characterized in that it includes a flange seat (1), a lower gland (2), a lower wear ring (3), a lower outer rubber core (4), a lower inner rubber core ( 5), lower piston head (6), lower mud scraper (7), lower support frame (8), lower support cylinder (9), lower piston rod (10), balance manifold (11), upper piston rod ( 12), upper support cylinder (13), upper support frame (14), upper piston head (15), upper end cover (16), upper mud scraper (17), upper gland (18), upper wear ring ( 19), upper outer rubber core (20), upper inner rubber core (21), outer casing (22), pressure relief manifold (23), coupling detector (24), upper inner rubber core (21), upper The outer rubber core (20), the lower inner rubber core (5) and the lower outer rubber core (4) are symmetrically installed in the outer shell (22), and the upper inner rubber core (21) and the upper end cover (18) are installed by screws The upper wear-resistant ring (19), the lower inner rubber core (5) and the flange seat (1) are installed with screws through the lower wear-resistant ring (3), the upper support cylinder (13) and the lower support cylinder (9) through bolts Symmetrically installed in the outer casing (22), the contact surfaces of the outer casing (22) and the upper support cylinder (13) and the lower support cylinder (9) adopt a stepped type, which is convenient for installation and positioning, and the upper mud scraper (17) is installed on the upper Between the inner rubber core (21) and the upper support cylinder (13), the lower scraper plate (7) is installed between the lower inner rubber core (5) and the lower support cylinder (9), the upper piston head (15) and the upper The piston rod (12) is installed on the lower part of the upper outer rubber core (20) through screw connection, and the upper outer rubber core (20) is squeezed by the upper piston rod (12) under the action of hydraulic oil to realize the upper inner rubber core (21). Sealing, the lower piston head (6) and the lower piston rod (10) are installed on the upper part of the lower outer rubber core (4) through screw connection, and the lower outer rubber core (4) is squeezed by the lower piston rod (10) under the action of hydraulic oil Press down the inner rubber core (5) to achieve sealing, the upper support frame (14) is installed between the upper end cover (16) and the outer shell (22), and the outer shell (22) has a stepped hole to facilitate the upper support frame (14) Positioning, the upper gland (18) connects the upper end cover (16) and the outer shell (22) together through bolts, the lower support frame (8) is installed between the flange seat (1) and the outer shell (22), and the outer shell A stepped hole is opened on the body (22) to facilitate the positioning of the lower support frame (8), and the lower gland (2) connects the flange seat (1) and the outer shell (22) together by bolts. 2. The double-rubber-core annular blowout preventer according to claim 1, characterized in that: the flange seat (1) is annular, the diameter of the outer circle is consistent with the diameter of the matching wellhead flange, and the annular flange Bolt holes are evenly distributed in the circumferential direction of the seat (1), and a sealing steel ring groove is opened on the lower surface of the circular flange seat (1) to install an octagonal sealing steel ring, and an O-shaped seal is installed between the outer surface of the flange seat and the outer shell Ring, sealing medium. 3. The double rubber core annular blowout preventer according to claim 1, characterized in that: 24 Φ47 bolt holes are evenly distributed in the circumferential direction of the flange seat (1). 4. The double-rubber-core annular blowout preventer according to claim 1, characterized in that: the outer casing (22) adopts stepped holes inside to facilitate the installation and positioning of other parts. 5. The double-rubber-core annular blowout preventer according to claim 1, characterized in that: four flange seats are evenly distributed in the circumferential direction of the outer casing (22) to install the balance manifold (11), pressure relief pipe Sink (23) and coupling tester (24), the flange seat is all designed with steel ring groove, in order to install octagonal sealing steel ring. 6. The annular blowout preventer with double rubber cores according to claim 1, characterized in that: the upper inner rubber core (21) and the lower inner rubber core (5) adopt a briquetting structure, and the upper inner rubber core ( 21) The size is the same as that of the lower inner rubber core (5), and the radial movement of the skeleton can be guaranteed during the sealing process, while reducing the internal stress concentration of the rubber core. 7. The double rubber core annular blowout preventer according to claim 1, characterized in that: the bottoms of the upper outer rubber core (20) and the lower outer rubber core (4) both adopt a tapered structure, which facilitates sealing during the sealing process. Squeeze the upper inner rubber core (21) and the lower inner rubber core (5). 8. The double rubber core annular blowout preventer according to claim 1, characterized in that: the upper mud scraper (17) and the lower mud scraper (7) are made of rubber material, which can remove the oil on the surface of the pipe string , to reduce damage to the pipe string. 9. The double-rubber-core annular blowout preventer according to claim 1, characterized in that: the coupling detector (24) is installed on the flange seat of the outer shell through bolts, during the lifting and lowering operation of the pipe string Cooperate with the balance manifold (11) and the pressure relief manifold (23) to realize that the oil pipe coupling does not forcibly pass through the rubber core of the annular blowout preventer, reducing damage to the rubber core.