CN201202427Y

CN201202427Y - Well head blowout preventer

Info

Publication number: CN201202427Y
Application number: CNU2008200897500U
Authority: CN
Inventors: 刘树学
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-04-15
Filing date: 2008-04-15
Publication date: 2009-03-04
Anticipated expiration: 2018-04-15

Abstract

The utility model relates to a wellhead well plugging device, which substantially solve the problem that a prior well plugging device is difficult to open, the cost of plugging a well is high, and the theftproof performance is poor. The wellhead well plugging device is characterized in that the outer portion of an outer cylinder (1) is orderly sleeved with a rubber cylinder (2) and a spacing ring (3), the outer portion of the outer cylinder (1) is connected with a nut (5) through a space pin (4), the space pin (4) is arranged in an axial long hole (6) of the nut (5), the inner portion of the outer cylinder (1) is sleeved with an inner cylinder (7), the lower end of the inner cylinder (7) is connected with the nut (5) through thread, a space ring (8) is arranged in a ring groove of the inner cylinder (7), a check valve (9) is arranged on the middle upper portion in the inner cylinder (7), a safety helmet (10) is arranged in the upper end of the outer cylinder (1), a lock rod (11) is arranged in a radial hole of the safety helmet (10), and the left side and the right side of an upper ring boss of the lock rod (11) are respectively sleeved with a small spring (12) and a big spring (13). The wellhead well plugging device has the characteristics of easy opening, low cost for plugging a well, excellent theftproof performance and convenient operation.

Description

The well head blowout preventer

Technical field:

The utility model relates to well head used shut-in well device, especially well head blowout preventer in the oil recovery field, oil field.

Background technology:

In oilfield process, the situation that oil well stops to produce is often to occur, as after the completion to pump down, after the discharge opeing before the metaideophone, oil pumping changes bailing, and because of moisture closing well of height or the like.Easily cause well head bleed preventing water phenomenon like this under the hydrostatic pressure of stratum, this just needs the sealing well head, and its purpose one is to prevent that oil gas from overflowing, resource conservation and environment; The 2nd, prevent to enter in the well foreign material and stop up pit shaft, cause well workover.And well head sealing does not at present also have the shut-in well device of very desirable maturation, typically use conventional wellhead cap shut-in well and following bridging plug dual mode, conventional wellhead cap shut-in well shortcoming is, sealing the back borehole pressure because of oil well can rise, and causes well head to build the pressure, and wellhead cap is difficult to open in the time of need opening, the capable also danger close of opening of band pressure, as add the valve shut-in well on wellhead cap, then valve is easily stolen by the people again or is drained the oil, and does not reach the purpose of shut-in well; Following bridging plug is to be lowered to bridging plug below hundreds of rice in well, is lowered to and opens bridging plug and need use a lot of operating expenses.

The utility model content:

Be difficult to open in order to solve existing shut-in well device, the problem of shut-in well expense height and theftproof performance difference, the utility model provides a kind of well head blowout preventer, this well head blowout preventer have open easily, the shut-in well expense is low, theftproof performance good, convenience operation.

The technical solution of the utility model is: this well head blowout preventer comprise the upper end outer have with casing coupling in the urceolus of the screw thread that matches, be with packing element and spacer ring successively under the outer middle bench of urceolus, urceolus is outer under the spacer ring is connected with nut by position-limitting pin, position-limitting pin places in the axial strip hole of nut, be covered with inner core by the upper end stage in the urceolus, the inner core lower end links to each other with nut by screw thread, the annular groove of inner core is built-in with spacing ring under the urceolus lower surface, be equipped with one way valve on the boss of middle and upper part in the inner core, the urceolus upper end is built-in with safety helmet, the safety helmet radial hole is built-in with locking bar, the annular boss left and right sides is with little spring and big spring respectively on the locking bar, and corresponding locking bar has annular groove in the urceolus.

Be filled with sealing ring in the annular groove of the outer middle and upper part of the inner core in the such scheme.

The utlity model has following beneficial effect: this well head blowout preventer is connected with casing coupling by urceolus owing to take such scheme, and this well head blowout preventer is fixed in the well head, by the glue tube base envelope, realizes the purpose of sealing.By safety helmet and locking bar, reach antitheft purpose.Thereby this well head blowout preventer has good theftproof performance, and well head does not have the part of exposing, and no special tool can't be opened.Can seal to such an extent that firmly solve, reliable in action, easy to operate, needn't play the lower tubular column operation, the shut-in well expense is low.The bearing capacity height can reach more than the 15MPa.Has pressure release tapping function, safety and environmental protection.Thus this well head blowout preventer have theftproof performance good, open easily, low, the convenience operation of shut-in well expense, help applying.

Description of drawings:

Accompanying drawing 1 is a structural representation of the present utility model.

1-urceolus among the figure, 2-packing element, 3-spacer ring, 4-position-limitting pin, 5-nut, 6-strip hole, 7-inner core, 8-spacing ring, 9-one way valve, 10-safety helmet, 11-locking bar, 12-little spring, 13-big spring.

The specific embodiment:

The utility model is described in further detail below in conjunction with accompanying drawing:

By shown in Figure 1, this well head blowout preventer comprise the upper end outer have with casing coupling in the urceolus 1 of the screw thread that matches, be with packing element 2 successively under the urceolus 1 outer middle bench, spacer ring 3, packing element 2 and spacer ring 3, promote packing element 2 successively by lower end spacer ring 3,2 envelopes of spacer ring 3 and packing element, be connected with nut 5 by position-limitting pin 4 outside 3 times urceolus of spacer ring 1, position-limitting pin 4 places in the axial strip hole 6 of nut 5, when rotating inner core 7, nut 5 can be moved up and down, and can not rotate, urceolus 1 is interior by being covered with inner core 7 on the stage of hole, big footpath, upper end, inner core 7 lower ends link to each other with nut 5 by screw thread, the annular groove of inner core 7 is built-in with spacing ring 8 under urceolus 1 lower surface, prevent inner core 7 and urceolus play about in the of 1 by spacing ring 8, be equipped with spring on the boss of middle and upper part in the inner core 7, the one way valve 9 that pressure ring and valve ball are formed, one way valve 9 is in order to prevent gas-liquid in the well contaminated environment that leaks, urceolus 1 upper end is built-in with safety helmet 10, safety helmet 10 radial holes are built-in with locking bar 11, the annular boss left and right sides is with little spring 12 and big spring 13 respectively on the locking bar 11, corresponding locking bar 11 has annular groove in the urceolus 1, in off position down, in the annular groove that big spring 13 promotion locking bars 11 insert in the urceolus 1, play antitheft effect, be filled with sealing ring in the annular groove of inner core 7 outer middle and upper parts, sealing ring plays the effect that strengthens sealing effectiveness.

During actual the use, at first this well head blowout preventer is put into the well head sleeve pipe, because urceolus 1 upper end diameter is greater than casing inner diameter, so just nature is in the box cupling of sleeve pipe in this well head blowout preventer upper end, the upper surface of this well head blowout preventer is lower than the box cupling upper edge.With special tool turn urceolus 1, the screw thread of urceolus 1 upper end is docked with casing coupling, the urceolus 1 of this well head blowout preventer just has been fixed in the casing coupling, rotate the inner core 7 of this well head blowout preventer then with special tool, then the screw thread of inner core 7 lower ends is up with regard to drive nut 5, make it the seat envelope by spacer ring 3 compression packing elements 2, after then locking bar 11 being pressed in the safety helmet 10, be buckled in the enlarged diameter section of upper end of urceolus 1, so locking bar 11 just is stuck under the thrust of big spring 13 in the annular groove in the urceolus 1, the seat envelope is promptly accused and is finished.When this well needs deblocking, with special-purpose rig floor the cylinder at safety helmet 10 centers is bored earlier, so under the effect of little spring 12, locking bar 11 is withdrawn in the safety helmet 10, safety helmet 10 just can be removed, then just can reverse rotation inner core 7 and urceolus 1, the screw thread of inner core 7 lower ends is descending with regard to drive nut 5, makes packing element 2 deblockings, finishes deblocking, urceolus 1 is also released with the screw thread of casing coupling simultaneously, so just can take out blowout preventer in well.As pressure is arranged in the well, after taking away safety helmet 10, link to each other by screw thread in sebific duct head and the inner core 7 before the deblocking, the ledge of tube head lower end will be depressed one way valve 9, and the interior hydrops of well will enter in the tank car by the sebific duct outflow.After oil gas has been put, lay down sebific duct, again the inner core 7 and urceolus 1 deblocking of reverse turn blowout preventer.Thereby this well head blowout preventer has good theftproof performance, and well head does not have the part of exposing, and no special tool can't be opened.Can seal to such an extent that firmly solve, reliable in action, easy to operate, needn't play the lower tubular column operation, the shut-in well expense is low.The bearing capacity height can reach more than the 15MPa.Has pressure release tapping function, safety and environmental protection.Thus this well head blowout preventer have theftproof performance good, open easily, low, the convenience operation of shut-in well expense.

Claims

1, a kind of well head blowout preventer, comprise the upper end outer have with casing coupling in the urceolus (1) of the screw thread that matches, it is characterized in that: be with packing element (2) and spacer ring (3) under the outer middle bench of urceolus (1) successively, spacer ring (3) is connected with nut (5) by position-limitting pin (4) outside the urceolus (1) down, position-limitting pin (4) places in the axial strip hole (6) of nut (5), be covered with inner core (7) by the upper end stage in the urceolus (1), inner core (7) lower end links to each other with nut (5) by screw thread, the annular groove of inner core (7) is built-in with spacing ring (8) under urceolus (1) lower surface, be equipped with one way valve (9) on the boss of the interior middle and upper part of inner core (7), urceolus (1) upper end is built-in with safety helmet (10), safety helmet (10) radial hole is built-in with locking bar (11), locking bar (11) is gone up the annular boss left and right sides and is with little spring (12) and big spring (13) respectively, and corresponding locking bar (11) has annular groove in the urceolus (1).

2, well head blowout preventer according to claim 1 is characterized in that: be filled with sealing ring in the annular groove of the outer middle and upper part of inner core (7).