CN2045422U

CN2045422U - Fast installing casinghead

Info

Publication number: CN2045422U
Application number: CN 88221129
Authority: CN
Inventors: 吴克信
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-12-17
Filing date: 1988-12-17
Publication date: 1989-10-04

Abstract

The utility model discloses a fast installing casing head for sealing an oil well and hanging a casing tube. A casing tube is hung on an inner sealing ring of a conic step. A cone with an outer sealing ring is arranged in an inner conic casing. By that waiting-on cement slurry is hydrated to release heat, annular space is pressurized to wait on cement automatically, and air-gas cross flow of the annular space on the cement slurry because of weightlessness is controlled. By using the fast installing casing head, the task of closing an oil well head can be completed in two minutes, and the well cementing qualified rate of a high-pressure oil and gas well at one time can reach 100 percents. The harm of clamping and hurting a casing tube is avoided, and accidents of breaking a well head device are stopped. The height and the weight of the casing head are reduced by a half, and the cost is reduced by two thirds.

Description

Fast Installing casinghead

The utility model relates to a kind of Fast Makeup Casing Head that is used for sealing oil well and suspension sleeve.

Existing casing head can only be used for suspension sleeve.Owing to adopt the method for slips clamping to hang, exist not only that assembling is wasted time and energy, the problem of the tall and big heaviness of structure, and exist and hang the little and easy deficiency of hindering sleeve pipe of blocking of load.

When the sealing oil well, because that cement paste wait to coagulate is weightless, the stratum high-pressure oil gas is scurried in the well, thereby caused the annular space liquid that steams.Because the assembling of the shut-in well of former casing head needs 4-6 hour, and being set in of cement finished in 1-3 hour, before casing head had been adorned, high pressure zone oil gas was scurried out outside the well already, caused to such an extent that 25% oil well emits liquid to influence exploitation because of steaming.Even after the expensive reparation of taking a lot of work, be difficult to guarantee the gas production of normally recovering the oil, make the oil well maimed person.In decades, people are in order to solve this difficult problem, inquired into the pressurization of employing well head, add cenosphere in cement, with fluid loss additive with adopt two to coagulate method such as cement, all can not solve the problem of existence fully.

The purpose of this utility model: be to provide a kind of can not only the raising to hang load, prevent that casing clamp hinders, reaches that cost is low, assembly technology is simply quick, and can reach the Fast Makeup Casing Head of sealing oil well function.

The utility model is achieved in that the outer step of annular that utilizes cover pipe collar and sleeve pipe assembling back to form, and on the inner seal ring that seat is put on the step in the cone annular, the cone of band outer seal ring is contained in the inner conical housing that matches.The seat formula hangs owing to take simply, makes the height of housing and weight reduce half, makes assembly process simply, fast, has not only improved the suspension load-bearing capacity, and can prevent the casing clamp wound.Under the pressure of casing wt, the inside and outside joint ring of cone is compressed, before beginning to condense, just seals the cement paste of bottom the well head annular space fast thereby reach.When cement paste time in bottom is coagulated hydration heat, cause annular space upper liquid expanded by heating, having played builds the pressure automatically waits the purpose of coagulating, and waits the annular space liquid column hydrostatic pressure loss of coagulating weightlessness thereby remedied because of cement paste, has stoped hydraulic oil, has channeling to be gone in the well.Thereby guaranteed cementing quality, controlled the quality accident that the well head annular space steamed, emitted liquid effectively, reached the purpose of sealing oil well function.

The utility model also can be realized like this: on the basis of above scheme, the sliding sleeve of band slips sheet is housed in cone, pushes down the slips sheet with pressure cap, be equipped with on housing and tighten up pin.Slips sheet after the assembling blocks the cover pipe collar under the pressure effect of pressure cap, the cover pipe collar can not be rotated relative to cone.The pin that tightens up on the housing is fastened on the cone, cone can not be rotated relative to housing.

The utility model can also be realized like this: on the basis of first scheme or alternative plan, jackscrew is housed on cone, in order to cone is fixed on the sleeve pipe.

The utility model can also be realized like this: on the basis of first and second or third party's case, last sealing ring between the packing ring and lower seal are enclosed within on the pipe collar, have improved the seal and pressure bearing ability of assembling well head after the assembling.

The utility model technical scheme preferably is: on the basis of first and second or third party's case, with screw housing, large washer and well head four-way are directly assembled.Avoid middle employing flange spool formed " thin neck " like this, increased well head stability, stopped the wellhead assembly accident that fractures.

The utility model best techniques scheme is: on the basis of cubic case, with screw housing, large washer and well head four-way are directly assembled.So promptly improve the seal and pressure bearing ability of assembling well head, avoided middle employing flange spool formed " thin neck " again, increased well head stability, stopped the wellhead assembly accident that fractures.

Describe in detail according to concrete structure and the assembly method thereof that the utility model proposes below in conjunction with drawings and Examples.

Accompanying drawing is an assembling half sectional view of the present utility model.

With reference to accompanying drawing, the sliding sleeve 4 of band slips sheet 13 is housed in cone 11, on the interior step of cone 11, inner seal ring 12 is housed, in the groove of the conical outer surface of cone 11, outer seal ring 6 is housed.Cone 11 after the assembling is sleeved on cover pipe collar 15 places of a sleeve pipe 10, and fastening, in the above suit upper pressing cap 3, packing ring 2, lower seal 17, packing ring 2, last sealing ring 18 and packing ring 2 successively with two jackscrews 7.

Before setting of casing 10, remove blowout preventer, to be connected with flange spool at the bottom of the former well head with the inner conical housing 9 that cone 11 is complementary, housing 9 upper flange connect simple wellhead, can be with sleeve pipe 10 G.I.Hs, during down to last root sleeve pipe 10, with landing joint will overlap that cone 11 on the pipe collar 15 is sent into and seat in the housing 9 of inner conical, the fastening pin 14 that tightens up, open the sluices 8 be capable of circulation and the well cementation.Closed shutter 8 after the bruising, reach the purpose that it is sprained automatically and presses time to coagulate.Remove simple wellhead then, production wellhead four-way 1 directly is connected with housing 9 with large washer 16, can hand over the well formation testing with bolt 5.

Use the said Fast Makeup Casing Head of the utility model, compare with existing casing head and have the following advantages:

1. seal the speed of oil well mouth: from original 4～6 hours, only bringing up to needed just can finish in 1～2 minute.

2. high-pressure oil-gas well qualification rate of cementing brings up to 100% from original 75%.

3. increase the stability of well head, stopped the wellhead assembly accident that fractures.

4. increase the ability of hanging load, avoided card to hinder the harm of sleeve pipe.

5. height and weight only have original half, cost 2/3rds, and assembling is simple, and is easy to operate.

6. the social benefit of bringing is very big: play 50 high-pressure oil-gas wells calculating every year with certain oil field, on average the cost 2/3rds of each well just can be saved 3,000 ten thousand yuan～3,750 ten thousand yuan fund so every year.

Claims

1, a kind of Fast Makeup Casing Head that is used for sealing oil well and suspension sleeve is characterized in that cover pipe collar 15 is contained on the inner seal ring 12 of cone 11 steps, and the cone 11 of band outer seal ring 6 is contained in the housing 9 of inner conical.

2, Fast Makeup Casing Head as claimed in claim 1 is characterized in that the sliding sleeve 4 of being with slips sheet 13 is housed in the cone 11, pushes down slips sheet 13 with pressure cap 3, is equipped with on housing 9 and tightens up pin 14.

3, Fast Makeup Casing Head as claimed in claim 1 or 2 is characterized in that being equipped with on the cone 11 jackscrew 7.

4, Fast Makeup Casing Head as claimed in claim 3 is characterized in that last sealing ring 18 between the packing ring 2 and lower seal 17 are enclosed within on the pipe collar 15.

5, Fast Makeup Casing Head as claimed in claim 3 is characterized in that with bolt 5 housing 9, large washer 16 and well head four-way 1 directly being assembled.

6, Fast Makeup Casing Head as claimed in claim 4 is characterized in that with bolt 5 housing 9, large washer 16 and well head four-way 1 directly being assembled.