CN2787821Y

CN2787821Y - Installing stub for square drill rod

Info

Publication number: CN2787821Y
Application number: CN 200520033865
Authority: CN
Inventors: 王德玉; 刘绘新
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2005-04-11
Filing date: 2005-04-11
Publication date: 2006-06-14
Anticipated expiration: 2015-04-11

Abstract

The utility model relates to an installing nipple for a kelly rod of a blowout controlling tool in the kelly rod, which is used during the process of petroleum drilling. The utility model is mainly composed of a lower connecter, a spring seat, a spring, a small valve core, a big valve core, a sealing ring, a valve seat, a fixed ring, a push rod, a ring, an upper connector, etc., wherein the lower connecter is connected with a screw of the upper connector, the spring seat is fixed in the lower connecter, and the spring seat is provided with a plurality of axial through holes. The small valve core which is positioned in the big valve core is upward pushed by the spring, and the big valve core is provided with a plurality of radical holes. The valve seat is fixed into the lower connecter inner by the fixed ring, and the sealing ring is arranged between the valve seat and the lower connecter. The push rod is positioned in the upper connector and is provided with a plurality of axial holes, and the diameter of the lower end of the push rod is less than that of the intermediate section. The push rod is blocked by the ring and a circular bead in the upper connector. The original lower kelly cock is replaced by the utility model, and a mechanical push rod is adopted to control the opening and the closing of a valve. The utility model has the advantages of simple structure and easy operation. Drilling fluids are effectively prevented from ejecting from the drill rod, and disaster aftermath brought by the uncontrollable blowout is reduced.

Description

Kelly bar is robbed the dress pipe nipple

Technical field:

The utility model relates to blowout prevention instrument in the drilling rod that is used for Process of Oil Well Drilling.

Background technology:

In the drilling process of high-pressure oil-gas well, when strata pressure during greater than drilling well liquid columnpressure, formation fluid might enter in the well drilling fluid, causes overflow even blowout, must in time control.It is more complete that at present domestic and international oil field is used for the equipment of the outer annular space passage blowout prevention of drilling rod, technical also comparative maturity, but blowout prevention instrument and technology are still the weak link of blowout prevention system in the drilling rod, blowout prevention instrument such as the upper and lower plug valve of kelly bar in existing several drilling rod, back-pressure valves etc. can not be used at crucial moment, in case blowout in the drilling rod takes place in the process of making a trip, will cause great threat to the safety of personnel and rig, even the consequence of bringing on a disaster property.As world-shaking Chongqing 1223 gas blowout accidents be exactly in the process of making a trip in the drilling rod blowout cause the economic loss of the dead and several hundred million units of people more than 200.

At present both at home and abroad the problem that the blowout prevention instrument mainly exists in the drilling rod that uses of oil field is: when 1, blowout took place in the drilling rod, existing back-pressure valve was not adorned; When 2, blowout taking place in the drilling rod, existing plug valve under high pressure closes incessantly, does not open even barred up also, and its reason is that structure, material and the manufacturing process of valve all can not satisfy functional requirement.Under the high pressure during shut off valve sealing surface will be wounded by stabbing, shut very fast badly by thorn, even barred up, mud enters seal clearance, rotational valve core needs the moment of thousands of ox rice under the high pressure, obviously the workman pulls motionlessly, does not open.

The utility model content:

The purpose of this utility model is that provider's drilling rod robs the dress pipe nipple, substitutes original lower kelly cock, realizes that the control drilling fluid sprays in drilling rod, reduces the catastrophic effect that blowout out of control brings.

For achieving the above object, the technical solution adopted in the utility model is: replace stopcock structure with the compound one-way valve structures of machine control, with the open and close control of drilling rod spinner tool operation pipe nipple internal channel.

Kelly bar is robbed the dress pipe nipple, by lower contact, spring base, spring, small valve core, big valve core, sealing ring, valve seat, retainer ring, push rod, ring, compositions such as top connection, it is characterized in that, described lower contact is threaded with top connection, spring base is fixed in the lower contact, have a plurality of axially extending bores on the spring base, spring upwards withstands small valve core, and small valve core places in the big valve core, and a plurality of radial holes are arranged on the big valve core, described valve seat is fixed in the lower contact by retainer ring, be provided with sealing ring between valve seat and the lower contact, described push rod places in the top connection, has a plurality of axial holes on the push rod, the lower end diameter of push rod has ring and shoulder to block push rod less than the stage casing diameter in the top connection.

When inserting the drill string upper end, the screw thread of top connection all screws in the lower contact, and push rod is in the position that spool and spool are pushed open downwards, and spring is compressed, and the valve inner flow passage is unimpeded, is convenient to be attached to smoothly when ejection liquid is arranged in drilling rod on the drill string basis is novel.

When this is novel be attached to drill string upper end after, with tong top connection is unscrewed, small valve core, big valve core and push rod move up under the effect of spring and hydraulic coupling together, close up to big valve core and small valve core, so the liquid in the drilling rod is sealed, blowout is under control.

After connecting kelly bar, can screw top connection again, push rod at first backs down pressure release downwards with small valve core, just big valve core is pushed open then, so can carry out follow-up kill jobs such as pressure measurement.

Compared with prior art, the utlity model has following beneficial effect:

(1) open and close of employing mechanical push rods control valve are simple in structure;

(2) adopt upper and lower joint two-stage structure, produce bigger end thrust and by the closing and opening of mechanical push rods operation control valve core by the rotation top connection, easy to operate;

(3) owing to adopt large and small spool composite construction, open the small valve core pressure release earlier, the power of opening valve is reduced greatly, guarantee valve energy smooth opening;

(4) adopt large and small cone valve structure, the surfacing carbide alloy is to improve the abrasion resistance energy on conical valve base and valve core sealed cover, and processing is easier to than other structures.

Description of drawings

Fig. 1 is the utility model structural representation

The specific embodiment

Referring to Fig. 1, kelly bar is robbed the dress pipe nipple, mainly by lower contact 1, spring base 2, spring 3, small valve core 4, big valve core 5, sealing ring 6, valve seat 7, retainer ring 8, push rod 9, ring 10, top connection 11 compositions such as grade, it is characterized in that, described lower contact 1 is threaded with top connection 11, spring base 2 is fixed in the lower contact 1, have a plurality of axially extending bore a on the spring base 2, spring 3 upwards withstands small valve core 4, small valve core 4 places in the big valve core 5, a plurality of radial hole b are arranged on the big valve core 5, and described valve seat 7 is fixed in the lower contact 1 by retainer ring 8, is provided with sealing ring 6 between valve seat 7 and the lower contact 1, described push rod 9 places in the top connection 11, have a plurality of axial hole c on the push rod 9, the lower end diameter of push rod 9 has ring 10 and shoulder d to block push rod 9 less than the stage casing diameter in the described top connection 11.

The utility model kelly bar is robbed the dress pipe nipple, substitutes original lower kelly cock, robs the upper end that is contained in drill string during blowout in drilling rod occurring, controls drilling fluid effectively and sprays in drilling rod, connects kelly bar then and continues follow-up kill job.

Claims

1 kelly bar is robbed the dress pipe nipple, mainly by lower contact (1), spring base (2), spring (3), small valve core (4), big valve core (5), sealing ring (6), valve seat (7), retainer ring (8), push rod (9), ring (10), top connection compositions such as (11), it is characterized in that, described lower contact (1) is threaded with top connection (11), spring base (2) is fixed in the lower contact (1), have a plurality of axially extending bores (a) on the spring base (2), spring (3) upwards withstands small valve core (4), small valve core (4) places in the big valve core (5), a plurality of radial holes (b) are arranged on the big valve core (5), described valve seat (7) is fixed in the lower contact (1) by retainer ring (8), be provided with sealing ring (6) between valve seat (7) and the lower contact (1), described push rod (9) places in the top connection (11), has a plurality of axial holes (c) on the push rod (9).

2 kelly bars as claimed in claim 1 are robbed the dress pipe nipple, it is characterized in that, the lower end diameter of described push rod (9) has ring (10) and shoulder (d) to block push rod (9) less than the stage casing diameter in the described top connection (11).