CN2245660Y

CN2245660Y - Underground anti-injection and anti-leakage sealing apparatus for drilling

Info

Publication number: CN2245660Y
Application number: CN 96205128
Authority: CN
Inventors: 杜晓瑞
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-03-12
Filing date: 1996-03-12
Publication date: 1997-01-22
Anticipated expiration: 2006-03-12

Abstract

The utility model relates to an anti-injection and anti-leakage well sealing apparatus, mainly composed of a casing, a core shaft, a spline, sealing capsules, a valve body and a valve seat. The upper and the lower parts of the core shaft are respectively provided with right and left quadrate threads which are respectively matched with quadrate threads in the casing; the bottom end of the core shaft is provided with the inverted conical solid valve body which can be opened and closed by matching with the valve seat which is arranged at the lower part of the casing; pore canals which are respectively corresponding to pore canals on the core shaft are arranged on the casing, and a circle of sealing capsules are arranged outside the pore canals on the casing; the upper and the lower parts of the core shaft are connected and transmitted by the spline; both ends of the well sealing apparatus are provided with standard threads.

Description

Creep into down-hole blowout prevention leakproof blowout preventer

The utility model relates to a kind of blowout preventer that drilling process prevents well kick blowout and leakage that is used for, and belongs to the drilling technology field of petroleum natural gas exploration.

At present, in the exploration and development drilling engineering of petroleum gas, well kick, blowout or leakage phenomenon take place often, in the prior art, for anti-well kick, blowout are at well head dress blowout preventer, improve drilling fluid density with control pit shaft pressure balance or exceed the pressure of formation fluid, suppress the intrusion of formation fluid to pit shaft; And leakage is singly to carry out leak stopping with the density of turning down drilling fluid; Well kick, blowout can also be adopted the circulation well killing method, and increase the weight of on limit circulation, limit.Still there are the following problems in above measure: 1. seal well head and can not effectively prevent high-pressure oil gas fluid in the stratum to continue intrusion to pit shaft; 2. the well head pressure height requires the huge and reliability highly of equipment; 3. controlling bad meeting causes serious blowout out of control even leads to fire; 4. handle leak stopping not only engineering complexity, expense height, deal with improperly sometimes and can cause that the top well collapses, drilling tool is buried, even serious consequence such as abandoned well.

The purpose of this utility model is to overcome the shortcoming of above-mentioned prior art, and a kind of new blowout preventer that creeps into usefulness down-hole well blowout preventing, well kick, leakage of design, can control the intrusion of formation fluid in the shaft bottom to pit shaft, and can prevent the immersion of fluids such as high-pressure oil gas effectively and timely, can effectively prevent the blowout preventer of drilling fluid equally to the leakage on stratum.

The purpose of this utility model is achieved in that it mainly is made of housing 1, mandrel 2, spline 4, seal capsule 6, valve body 7 and valve seat 8, be provided with positive and anti-flat thread 3 and 5 in the upper and lower of mandrel 2, and match with flat thread in the housing 1 respectively; Mandrel 2 bottoms are provided with a solid valve body 7 of turbination, and valve body 7 can be driven by mandrel 2, and can open and close mutually with the valve seat 8 that is installed in housing 1 bottom and be sealed and matched; Be better sealing, in the valve body 7 outside rubber seal 14 of installing; On mandrel 2, be provided with duct 10 and 11, also be provided with on its housing 1 can with duct 10 on the mandrel 2 and 11

corresponding ducts

12 and 13; The outside in the duct 13 on housing 1 is provided with a circle seal capsule 6; The top of mandrel 2 is connected and transmission by spline 4 with the bottom.The two ends of this blowout preventer are equipped with the screw thread 9 of standard, can be connected on the drilling tool, and can be with at the bottom of the drill bit lower going-into-well.

Invention effect of the present utility model is as follows: 1. use and originally creep into blowout prevention leakproof blowout preventer, can close the passage of spray-up or drop ply and pit shaft quickly and safely, prevent preferably gushing, spraying and leak.2. can separate this blowout preventer and top drilling tool as required, the top drilling tool can be free movable, and keep circulation, is necessary that drilling tool can be pressed on the blowout preventer, still circulation as usual.3. this blowout preventer seat envelope is easy, and deblocking is also very convenient, easy and simple to handle.4. the mandrel of this blowout preventer can withdraw from top from housing as required, also can recover the original matching relationship with housing at any time, and revert to the state of creeping into.Blowout preventer housing anti-sticking good, easily free, can establish two above capsules, make it reach positive confinement to the borehole wall, capsule has the compliance of special formation.6. housing also can be established the slip-type anchor, with the pressure of balance well kick, blowout fluid.

Fig. 1 is a structural representation of the present utility model.

Now the utility model will be further described in conjunction with the accompanying drawings:

In the execute-in-place that uses this blowout preventer, the counter-rotating drilling tool makes the housing 1 of blowout preventer and mandrel 2 produce relative motion, be that mandrel 1 is that track top is just turning to back-off with the screw thread in the housing 2, and the bottom counter-rotating of mandrel 2 moves down.When 8 envelopes of valve body 7 and valve seat, circulation canal original between housing 1 and the mandrel 2 is closed, at this moment the duct 10 on the mandrel 2 communicates with duct 12 on the housing 1, still also continue circulation, when the duct 13 on duct on the mandrel 2 11 and the housing 1 communicates, just give blowout preventer seal capsule 6 hydraulic pressure transfer in the drilling tool, its rubber seal capsule 6 is expanded, just sealed the annular space between the drilling tool and the pit shaft borehole wall preferably, spray-up or drop ply have been intercepted, spray is leaked all can not take place, reaching shut-in well, thereby realized the purpose of this utility model.

The utility model has the part of duct 13 and seal capsule 6, also can give and make the threaded pipe nipple in two, but the base area stressor layer is added a joint or two these pipe nipples of joint suitably the time.

Claims

1. one kind is used for the creeping into down-hole blowout prevention leakproof blowout preventer of oil, natural gas exploration and development drilling technology, mainly constitute by housing (1), mandrel (2), spline (4) seal capsule (6), valve body (7), valve seat (8), it is characterized in that: being respectively equipped with positive and anti-flat thread (3) and (5) in the upper and lower of mandrel (2), can be respectively matches with flat thread in the housing (1) in its flat thread (3) and (5); Be provided with the solid valve body of a turbination (7) in the bottom of mandrel (2), valve body (7) can open and close cooperation mutually with the valve seat of installing in housing (1) bottom (8); Duct (10) and (11) are arranged on mandrel (2), on housing (1), also have respectively and duct (10) and (11) corresponding duct (12) and (13); The outside of going up duct (13) at housing (1) is provided with a circle seal capsule (6); The top of mandrel (2) is connected and transmission by spline (4) with the bottom; Be equipped with standard thread (9) at the two ends of blowout preventer.

2. according to claim 1 creeping into blowout prevention leakproof blowout preventer is characterized in that: drive valve body (7) outside that opens and closes by mandrel (2) and be provided with rubber seal (14).

3. according to claim 1 creeping into blowout prevention leakproof blowout preventer, it is characterized in that: the outside of going up duct (13) at housing (1) is provided with seal capsule (6), also can be by anti-H ₂The material of S or acidproof alkali salt; And can be made into mandrel (2) and have hole (11), housing (1) has duct (13), and two ends are equipped with the seal capsule pipe nipple of screw thread.