CN111005699A

CN111005699A - Vertical coiled tubing blowout preventer

Info

Publication number: CN111005699A
Application number: CN201911105504.9A
Authority: CN
Inventors: 王凯; 耿海滨; 姜彬; 李鹏; 王芳; 白雪娇; 王玲玲; 金琳; 肖文
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-11-13
Filing date: 2019-11-13
Publication date: 2020-04-14

Abstract

The invention discloses a vertical coiled tubing blowout preventer, which sequentially comprises a half sealing part, a hanging part, a cutting part and a full sealing part from bottom to top. The coiled tubing blowout preventer with the vertical structure changes the horizontal structure into the vertical structure, thereby gaining space for operation construction, facilitating operation and reducing the occurrence of operation accidents; the full seal is changed from passive closing to active closing, so that the whole blowout preventer is safer; the incision is changed from straight cutting to rotary cutting, so that the incision is changed from a straight opening to a round opening, and the use is changed to be smoother; the suspension is controlled by hydraulic pressure and becomes an interlocking type, so that the accident caused by the necking phenomenon of the coiled tubing in the prior art is reduced; the design of annular partly seals makes partly to seal more reliable, and the adaptability is stronger, has overcome original flashboard formula partly to seal and make partly to seal inefficacy because of deformation and necking phenomenon's emergence, reduces the probability that the accident took place.

Description

Vertical coiled tubing blowout preventer

Technical Field

The invention relates to oilfield equipment, in particular to a vertical coiled tubing blowout preventer.

Background

In the process of oil exploitation, a coiled tubing loading vehicle is called a universal working vehicle, in the using process of coiled tubing, four layers of special blowout preventers are necessary, the currently used four layers of blowout preventers are 4FZ blowout preventers, namely four ram blowout preventers, the 4FZ blowout preventers are four layers of transverse blowout preventers, and because eight hydraulic cylinders which extend outwards exist in the structure, the transverse blowout preventers bring great inconvenience to operators in the actual operation process, sometimes cause injury to the operators, and simultaneously have some inconvenience in application, so that the invention designs a more suitable vertical structure.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a vertical coiled tubing blowout preventer which is smooth to use, safe and reliable.

The technical scheme is as follows: the vertical continuous oil pipe blowout preventer sequentially comprises a half-sealing part, a suspension part, a cutting part and a full-sealing part from bottom to top, wherein the half-sealing part comprises a lower joint, an annular half-sealing part, a seat sealing inner sleeve, a seat sealing piston, a half-sealing outer cylinder sleeve and a half-sealing connecting ring, the suspension part comprises a conical surface fixing ring, a connecting bolt (30), a seat clamping conical surface, a reset spring seat, a reset spring sleeve, a slip reset spring, a slip support, a seat clamping sealing cylinder, a seat clamping sealing inner sleeve, a seat clamping piston and a suspension connecting ring, the cutting part comprises a lower flange, a pressure ball, a cutting knife rest, a feeding screw rod, a feeding limit compression ring, a cutting swivel, a bolt, an upper flange and a nut, the full-sealing part comprises an upper joint, a full-sealing outer cylinder sleeve, a hydraulic oil exchange groove, a flashboard fixing bolt, a flashboard rotating, The gate closing support, the gate closing support connecting disc, the gate connecting support guide shaft, the return spring and the transition connecting ring.

Compared with the prior art, the invention has the following advantages: the coiled tubing blowout preventer with the vertical structure changes the horizontal structure into the vertical structure, thereby gaining space for operation construction, facilitating operation and reducing the occurrence of operation accidents; the full seal is changed from passive closing to active closing, so that the whole blowout preventer is safer; the incision is changed from straight cutting to rotary cutting, so that the incision is changed from a straight opening to a round opening, and the use is changed to be smoother; the suspension is controlled by hydraulic pressure and becomes an interlocking type, so that the accident caused by the necking phenomenon of the coiled tubing in the prior art is reduced; the design of annular partly seals makes partly to seal more reliable, and the adaptability is stronger, has overcome original flashboard formula partly to seal and make partly to seal inefficacy because of deformation and necking phenomenon's emergence, reduces the probability that the accident took place.

Drawings

FIG. 1 is a schematic top view of an embodiment of the present invention;

FIG. 2 is a schematic diagram of the lower half of an embodiment of the present invention;

FIG. 3 is a cross-sectional view of section A-A of the present invention;

FIG. 4 is a cross-sectional view of section B-B of the present invention;

FIG. 5 is a cross-sectional view of section C-C of the present invention;

FIG. 6 is a cross-sectional view of section D-D of the present invention;

figure 7 is a cross-sectional view of section E-E of the present invention.

Detailed Description

Referring to fig. 1-7, the vertical coiled tubing blowout preventer sequentially comprises a half-sealing part, a suspension part, a cutting part and a full-sealing part from bottom to top, wherein the half-sealing part comprises a lower joint 36, an annular half-sealing part 35, a setting sealing inner sleeve 34, a setting piston 33, a half-sealing outer cylinder sleeve 32 and a half-sealing connecting ring 31, the suspension part comprises a conical surface fixing ring 29, a connecting bolt 30, a setting clamping conical surface 28, a reset spring seat 40, a reset spring sleeve 39, a slip 27, a slip reset spring 41, a slip support 26, a setting clamping sealing cylinder 24, a setting clamping sealing inner sleeve 25, a setting clamping piston 23 and a suspension connecting ring 17, the cutting part comprises a lower flange 16, a pressure ball 22, a cutting knife 21, a cutting knife rest 20, a feeding screw rod 19, a feeding limiting compression ring 18, a cutting swivel 15, a bolt 14, an upper flange 12 and a nut 13, the full-sealing part comprises an upper joint 1, a, The hydraulic ram structure comprises a ram fixing bolt 3, a ram rotating shaft 4, a ram opening piston group 5, a connecting oil nozzle 6, sealing rubber 7, a sealing carrier 8, a ram closing support 9, a ram closing support connecting disc 37, a ram connecting support guide shaft 38, a return spring 10 and a transition connecting ring 11.

The working principle is as follows: the vertical coiled tubing blowout preventer is designed according to the safety and use requirements of coiled tubing, has four layers, four functions are indispensable, and the four layers are half-sealing, suspending, cutting and full-sealing from the bottom to the top in sequence.

The semi-seal is realized by that a setting piston 33 generates pressure through the action of a hydraulic cylinder, an annular semi-seal 35 is compressed, the annular semi-seal 35 is set, and the coiled tubing is sealed with the vertical coiled tubing blowout preventer.

The suspension is that the slips 27 are contracted inwards to clamp the coiled tubing by using the inclined plane principle, specifically, the seat clamping piston 23 is enabled to move downwards in a hydraulic mode to compress the slip holder 26, the slip holder 26 drives and compresses the slips 27 to move downwards, so that the slips 27 are seated on the coiled tubing, meanwhile, the slip return spring 41 is pressed to store elastic potential energy, when the hydraulic pressure is released, the slip holder 26 moves upwards under the potential energy action of the slip return spring 41, so that the slips 27 are driven to return to the original position to be unlocked.

The cutting is designed for the structure of the whole vertical blowout preventer, the cutting is more concise and smooth, the cutting part adopts a torque rotating mode, the cutting position is special, the sealing is critical, therefore, a sealing rubber ring is adopted in the structure for sealing, the feeding compensation of the cutting knife 21 is specifically carried out by utilizing the feed screw 19, the pressure of the cutting swivel 15 is reasonably released by adjusting the tightness of the nut 13, the cutting knife rest 20 can be rotated to complete the rotary motion of the cutting knife 21 driven by the cutting knife rest 15 for cutting, after the cutting is completed, the feed screw 19 is adjusted, the cutting knife 21 returns to the position of the cutting knife 21, meanwhile, the gland nut 13 is used for enabling the whole blowout preventer to be in a working state.

The full seal adopts a self-sealing type gate plate mechanism which is safe and reliable, the function of the blowout preventer is blowout prevention, the source of the jetting force is in an oil well, and the mechanism is designed aiming at the characteristic that when the pressure in the oil well overflows, the generated pressure is completely applied to the sealing rubber 7 and the sealing carrier 8, so that the sealing of the sealing rubber 7 and the upper joint 1 is more reliable.

The use process comprises the following steps: 1. connecting the vertical coiled tubing blowout preventer to a wellhead according to construction requirements; 2. the vertical coiled tubing is connected with a dynamic blowout prevention box; 3. the coiled tubing enters the upper part of a vertical coiled tubing blowout preventer through a dynamic blowout preventer box, and at the moment, a full seal is opened through a connecting oil nozzle 6 through hydraulic pressure; 4. when the full seal is opened, the coiled tubing can be normally lowered, and after the lowering is finished, the connecting oil nozzle 6 enables the seat seal piston 33 to move downwards through hydraulic pressure, and the annular semi-seal 35 is compressed to seal the annular semi-seal with the lowered coiled tubing; 5. after the semi-sealing seat is sealed, normal construction tasks can be carried out; 6. if the coiled tubing needs to be lifted out for construction, such as sand washing, paraffin removal, well washing and the like, after the operation is finished, the hydraulic pressure of the seat seal piston 33 is discharged, so that the annular half seal 35 is contracted, at the moment, the coiled tubing can be lifted out, when the coiled tubing is lifted between the blowout preventer and the movable blowout prevention box, the connecting oil nozzle 6 is operated to discharge the hydraulic pressure in the flashboard opening piston group 5, so that the full seal is automatically closed, at the moment, the coiled tubing can be lifted out, after the lifting, the blowout preventer on a wellhead is gradually removed, then the rest construction is carried out, and the operation of the coiled tubing is finished; 7. if the coiled tubing does not need to be lifted out, namely, a quick transit pipe, at the moment, the seat clamping piston 23 is driven to move downwards by hydraulic pressure, the slip 27 clamps the coiled tubing, then the cutting work can be carried out, the cutting of the coiled tubing firstly rotates the feed screw 19 inwards to generate certain pressure between the cutting knife 21 and the coiled tubing, at the moment, the feed of the feed screw 19 is stopped, the nut 13 is loosened to reduce the friction force, at the moment, the cutting swivel 15 is rotated to enable the cutting knife 21 to cut the coiled tubing, so that the cutting knife rotates while feeding until the coiled tubing is cut off, after the cutting off, the rest part of the coiled tubing can be lifted out by screwing the nut 13, the coiled tubing is lifted up, when the tail part of the cut part reaches between the blowout preventer and the movable seal box, the hydraulic pressure in the opening piston group 5 is released by operating the connecting oil nozzle 6, so that the full seal is closed automatically, at the moment, the coiled tubing can be, after the movable sealing box is lifted out, the movable sealing box can be handed over to the well after being detached, and the operation is finished.

Claims

1. Vertical coiled tubing preventer, its characterized in that: the semi-closed type cutting tool sequentially comprises a semi-closed part, a suspended part and a fully-closed part from bottom to top, wherein the semi-closed part comprises a lower joint (36), an annular semi-closed part (35), a seat seal inner sleeve (34), a seat seal piston (33), a semi-closed outer cylinder sleeve (32) and a semi-closed connecting ring (31), the suspended part comprises a conical surface fixing ring (29), a connecting bolt (30), a seat clamp conical surface (28), a reset spring seat (40), a reset spring sleeve (39), a slip (27), a slip reset spring (41), a slip support (26), a seat clamp seal cylinder (24), a seat clamp seal inner sleeve (25), a seat clamp piston (23) and a suspended connecting ring (17), the cutting part comprises a lower flange (16), a pressure ball (22), a cutting knife (21), a cutting knife rest (20), a feed screw (19), a feed limiting pressure ring (18), a cutting swivel (15), a bolt, The hydraulic oil cylinder is characterized by comprising an upper flange (12) and a nut (13), wherein the full-sealing part comprises an upper joint (1), a full-sealing outer cylinder sleeve (2), a hydraulic oil exchange groove (42), a flashboard fixing bolt (3), a flashboard rotating shaft (4), a flashboard opening piston group (5), a connecting oil nozzle (6), sealing rubber (7), a sealing carrier (8), a flashboard closing support (9), a flashboard closing support connecting disc (37), a flashboard connecting support guide shaft (38), a return spring (10) and a transition connecting ring (11).