CN2698966Y

CN2698966Y - Hydraulic down-hole casing valve for under balance drilling

Info

Publication number: CN2698966Y
Application number: CN 200420040903
Authority: CN
Inventors: 宋林松; 李宗清; 李建成; 周鲲; 万秀琦
Original assignee: Drilling Technology Research Institute of Sinopec Shengli Petroleum Administration Bureau
Current assignee: Drilling Technology Research Institute of Sinopec Shengli Petroleum Administration Bureau
Priority date: 2004-05-26
Filing date: 2004-05-26
Publication date: 2005-05-11
Anticipated expiration: 2014-05-26

Abstract

A hydraulic down-hole casing valve for under balance drilling of the utility model is composed of an outer cylinder, a slide core shaft, an upper oil opening, a lower oil opening, a valve plate and a valve core. The outer cylinder is a hollow cylinder body, the upper part of which is equipped with the slide core shaft and two sets the top and bottom sealing rings, and the outer cylinder is also processed with the upper oil opening and the lower oil opening, while the lower part is equipped with the valve core. The slide core shaft is a hollow step circular shaft, the outer circumference of which be equipped with sealing rings, and a drilling tool passes through the inner hole of the slide core shaft. The valve plate and a spring are arranged in the valve core through a hinge. Because of the adoption of the scheme above, the oil and gas of the stratum can be prevented entering a casing valve at the upper part as long as the valve plate of the down-hole casing valve is closed when pulling out the drill. The safe pulling out of the drill can be obtained without the well killing job to realize the under-balanced drilling during the whole process.

Description

A kind of under balance pressure drilling hydraulic control down hole sleeve valve

Technical field

The utility model relates to blowout prevention instrument in a kind of down-hole, particularly a kind of under balance pressure drilling hydraulic control down hole sleeve valve.

Background technology

Under-balanced drilling technology has the incomparable superiority of conventional drilling technology, can prevent formation damage effectively, reduces the downhole drill accident, improves oil well productivity and exploration efficiency.But at present in the under balance pressure drilling process, several factors has influenced the effect of under balance pressure drilling, for example before trip-out, must squeeze into weighted drilling fluid with equilibrium strata pressure, the last top power that the cover tube fluid affacts drilling tool when preventing to pull out of hole ejects drilling tool greater than the weight of drilling tool in well, and then causes blowout.But the weighted drilling fluid that injects before pulling out of hole will produce injury to the stratum inevitably.

For addressing the above problem, realize overall process under-balance drilling, the drilling company that has adopts not kill-job tripping assembly drilling.But facts have proved that this device needs the plenty of time erection equipment before using, need the plenty of time to realize pulling out of hole and tripping operation in the use, therefore prolonged the time that makes a trip, increased drilling cost greatly.

Summary of the invention

For guaranteeing can to finish round trip quickly and safely when the under-balanced state, the purpose of this utility model is to provide a kind of under balance pressure drilling hydraulic control down hole sleeve valve to society.

For realizing described purpose, a kind of under balance pressure drilling hydraulic control down hole sleeve valve that the utility model proposes is made up of urceolus [2], slip mandrel [4], last hydraulic fluid port [5], following hydraulic fluid port [8] and valve plate [9], spool [10], and slip mandrel [4] reciprocatingly slides in urceolus [2] and spool [10]; Slip mandrel [4] is hollow ladder circular shaft, and sealing ring [7] is installed on the excircle, and drilling tool passes from its endoporus; Urceolus [2] top is equipped with two groups of sealing rings [6] up and down, and is processed with hydraulic fluid port [5] and following hydraulic fluid port [8], and the bottom is equipped with spool [10]; Valve plate [9] and spring [12] are installed in the spool [10] by hinge [11].Urceolus [2] is a camcylinder, and its axis [1] is last lower contact and interior circle center line, and axis [2] is the cylindrical center line.

Owing to adopt such scheme, after drill bit plays valve plate [9] top when band is pressed trip-out, close valve plate [9] as long as inject hydraulic oil by the downward hydraulic fluid port of Ground Control pipeline [8], just can prevent that hydrocarbon stratum from entering upper sleeve, can pull out of hole quickly and safely; Under when drill bit is down to valve plate [9] top when boring, inject hydraulic oil by last hydraulic fluid port [5] and open valve plate [9] and can be with and depress brill, realize overall process under-balance drilling.

Description of drawings

Fig. 1 is the plane view of under balance pressure drilling hydraulic control down hole sleeve valve valve plate when closing

8 times hydraulic fluid ports of hydraulic fluid port 6 sealing rings, 7 sealing rings, 9 valve plates, 10 spools, 11 hinges, 12 springs on the interior circle of the 1 urceolus center line 2 urceolus 3 urceolus cylindrical center lines 4 slip mandrels 5 among the figure

The specific embodiment

Now the utility model is further described in conjunction with Figure of description.

In Fig. 1, slip mandrel [4] is equivalent to hollow fluid cylinder, can reciprocatingly slide in urceolus [2] under the oil pressure effect.Slip mandrel [4] slides into bottom-end of stroke when normally creeping into, and forces valve plate [9] to be in opening.When needing to pull out of hole in the under balance pressure drilling process, at first the drilling tool band has been pressed and be drilled into above the down hole sleeve valve, inject hydraulic oil by the downward hydraulic fluid port of Ground Control pipeline [8] then, force slip mandrel [4] under the oil pressure effect, to move up, spring [12] makes valve plate [9] clockwise rotate around hinge [11], its sealing surface contacts and forms sealing with the sealing surface of spool [10], prevent that hydrocarbon stratum from entering upper sleeve, so just can rush down the sleeve pipe upper pressure, open underbalance ground pressure control system, pull out of hole according to conventional method; Under when boring during according to a conventional method down to the down hole sleeve valve top, at first close the ground pressure control system, circulating fluid is with the upper and lower pressure of balance valve plate [9], inject hydraulic oil by the Ground Control pipeline hydraulic fluid port [5] that makes progress then, promoting slip mandrel [4] moves down, make valve plate [9] rotate counterclockwise and be in opening around its hinge [11], after this mandrel [4] that slides finally rests in the spool [10], depress brill and carry out underbalance and creep into to prevent valve plate [9] and drilling tool friction, so just can be with.

Claims

1, a kind of under balance pressure drilling hydraulic control down hole sleeve valve is made up of urceolus [2], slip mandrel [4], last hydraulic fluid port [5], following hydraulic fluid port [8] and valve plate [9], spool [10], and the mandrel [4] that it is characterized in that sliding reciprocatingly slides in urceolus [2] and spool [10]; Slip mandrel [4] is hollow ladder circular shaft, and sealing ring [7] is installed on the excircle, and drilling tool passes from its endoporus; Urceolus [2] top is equipped with two groups of sealing rings [6] up and down, and is processed with hydraulic fluid port [5] and following hydraulic fluid port [8], and the bottom is equipped with spool [10]; Valve plate [9] and spring [12] are installed in the spool [10] by hinge [11].

2, a kind of under balance pressure drilling hydraulic control down hole sleeve valve according to claim 1 is characterized in that urceolus [2] is a camcylinder, and its axis [1] is last lower contact and interior circle center line, and axis [2] is the cylindrical center line.