CN2680842Y

CN2680842Y - Hydraulic casing drive head for casing drilling

Info

Publication number: CN2680842Y
Application number: CN 200320127812
Authority: CN
Inventors: 谢正凯; 王辉; 冯来; 王玉明; 尹洪伟; 孟庆昆
Original assignee: Institute Of Science And Technology China Petroleum Group
Current assignee: Institute Of Science And Technology China Petroleum Group
Priority date: 2003-12-17
Filing date: 2003-12-17
Publication date: 2005-02-23
Anticipated expiration: 2013-12-17

Abstract

The utility model relates to a hydraulic casing drive head for casing drilling, belonging to the mode of rotary disc drilling. The inner side of the central lumen of the main shaft is provided with a piston which is axially and movably matched with the main shaft, and the chute of the side wall of the main shaft is provided with a slip which is radially and movably matched with the main shaft. The outer lateral surface of the slip is provided with a plurality of uniformly distributed teeth, and the inner lateral surface is provided with a plurality of arced inclines and the lower ends of the arced incline bulge inwards. The side surface of the piston positioned at the inner side of the slip has a cone structure, and the side surface of the piston is matched with the incline of the inner side of the slip. When drilling, the slurry is infused into the lumen of the main shaft from the upper end of the main shaft and generates pressure to the piston when the slurry flows to the upper end of the piston. When the piston is moved downwards, the piston pushes the slip to move outwards to tightly press the casing pipe, and then the casing pipe rotates with the slip. Therefore, the twist pitch transmission from the main shaft to the casing pipe is realized. When the slurry stops flowing, the piston resets under the function of the return spring, the slip is separated from the inner wall of the casing pipe, and the casing pipe is not driven by the main shaft. The on-off of the casing pipe of the drilling machine which adopts the driving head is flexible, the abrasion is small, and the drilling machine is uneasy to have slippage.

Description

Casing drilling fluid pressure type sleeve pipe driving head

Technical field

The utility model relates to a kind of oil drilling machine, is a kind of casing drilling fluid pressure type sleeve pipe driving head that mainly is adapted to the rotary drilling mode specifically.

Background technology

Casing drilling is a kind of emerging oil drilling mode, it adopts sleeve pipe to substitute drilling rod, directly drives drill bit, has greatly simplified drillng operation, reduced accident rate, reduced drilling cost, for the casing drilling that adopts the rotary drilling mode, if moment of torsion is directly transmitted by the cover pipe thread, just might cause the damage of sleeve pipe screw thread, cause sleeve pipe to skid, therefore, need other modes of design to transmit torque.

The utility model content

For overcoming the above-mentioned defective of prior art, the utility model provides a kind of casing drilling fluid pressure type sleeve pipe driving head, adopts the rig of this driving head, and its sleeve pipe is not fragile, is difficult for skidding long service life.

The technical scheme that the utility model overcomes the above-mentioned technological deficiency of prior art is: casing drilling fluid pressure type sleeve pipe driving head comprises main shaft and sleeve pipe, also comprise piston and some slips, described piston is arranged in the tube chamber of main shaft central authorities, with the axial sliding fit of main shaft inwall, be provided with the through hole of axial penetration piston in the piston, described slips is positioned at the slip groove of offering on the main shaft that penetrates the main shaft sidewall, move radially cooperation with slip groove, its lateral surface is provided with some teeth, the inboard is provided with the curve slope of plurality of sections lower end to convex, and the side that described piston is positioned at the slips inboard is the conical surface shape of the plurality of sections serial connection that matches with described slips curve slope.

Operating principle of the present utility model is: during drilling well, by the downward slurry conveyed of the tube chamber of main shaft central authorities, when mud flows to the piston upper end, through hole by piston is to dirty, because the diameter of piston hole is less than the diameter of piston upper end main shaft tube chamber, mud flow is obstructed, press piston downwards, piston is moved down, the conical surface shape side on the piston when piston moves down the inclined-plane by slips with slips to extrapolation, the teeth of slips lateral surface are pressed on the internal surface of sleeve pipe, formation is with the tight fit of sleeve pipe, drive sleeve pipe and together rotate with main shaft, stop the mud input after, piston moves under the effect of back-moving spring, unclamp slips, slips separates with sleeve pipe, no longer transmits torque, and sleeve pipe stops operating.

Because piston of the present utility model is a power with the essential mud of rig; mode by the teeth interlock realizes the transmission of main shaft torque to sleeve pipe; automatically realize the connection of sleeve pipe during drilling well with main shaft; clutch is freely, and is easy to operate, and because slips is big with the cooperation area of sleeve pipe; both do not contact during shutdown; therefore the wearing and tearing of teeth and internal surface of sleeve pipe are little, are not prone to skidding, prolonged the application life of sleeve pipe.

Description of drawings

Fig. 1 is that the utility model relates to the axial section structural representation that main shaft, piston, slips and sleeve pipe are coupled to each other relation;

Fig. 2 is that the utility model relates to slips and main shaft is coupled to each other the A corresponding with Fig. 1 of relation to cross-sectional schematic;

Fig. 3 is the axial section structural representation that the utility model relates to piston and main shaft connecting relation.

The specific embodiment

Referring to Fig. 1-3, the casing drilling fluid pressure type sleeve pipe driving head that the utility model provides comprises main shaft 2 and is enclosed within the sleeve pipe 1 in the main shaft outside, also comprise piston 3 and some slips 5, described piston 3 is arranged in the tube chamber of main shaft 2 central authorities, with main shaft 2 inwall axial sliding fits, be provided with the through hole 9 of axial penetration piston in the piston 3, described slips 5 is positioned at the slip groove of offering on the main shaft 2 that penetrates the main shaft sidewall, move radially cooperation with slip groove, its lateral surface is provided with some teeth 4, the inboard is provided with the curve slope 6 of plurality of sections lower end to convex, and the side that described piston 3 is positioned at slips 5 inboards is the conical surface shape of the plurality of sections serial connection that matches with curve slope 6 on the described slips.

Usually, the quantity of described slips 5 can evenly distribute around spindle axis for four.

Curve slope 6 quantity on the described slips 5 can be 2.

Described teeth 4 can evenly distribute on the fitting face of slips 5 and sleeve pipe 1.

Described piston 3 can be provided with back-moving spring.

Described piston upper surface 7 generally should be horizontal plane, so promptly is convenient to make, and can make again to guarantee the pressure of mud to piston 3.

Can be provided with some sealing rings 8 on the described piston 3 with the sealing of main shaft tube chamber.

Claims

1, a kind of casing drilling fluid pressure type sleeve pipe driving head, comprise main shaft and the sleeve pipe that is enclosed within the main shaft outside, it is characterized in that also comprising piston and some slips, described piston is arranged in the tube chamber of main shaft central authorities, with the axial sliding fit of main shaft inwall, be provided with the through hole of axial penetration piston in the piston, described slips is positioned at the slip groove of offering on the main shaft that penetrates the main shaft sidewall, move radially cooperation with slip groove, its lateral surface is provided with some teeth, the inboard is provided with the curve slope of plurality of sections lower end to convex, and the side that described piston is positioned at the slips inboard is the conical surface shape of the plurality of sections serial connection that matches with curve slope on the described slips.

2, casing drilling fluid pressure type sleeve pipe driving head as claimed in claim 1 is characterized in that described piston is provided with back-moving spring.

3, casing drilling fluid pressure type sleeve pipe driving head as claimed in claim 2 is characterized in that described teeth evenly distribute on the fitting face of slips and sleeve pipe.

4, casing drilling fluid pressure type sleeve pipe driving head as claimed in claim 3 is characterized in that described piston upper surface is a horizontal plane.

5, casing drilling fluid pressure type sleeve pipe driving head as claimed in claim 4 is characterized in that described piston is provided with the some sealing rings that seal with the main shaft tube chamber.

6, casing drilling fluid pressure type sleeve pipe driving head as claimed in claim 5 is characterized in that the quantity of described slips is four, evenly distributes around spindle axis.

7, casing drilling fluid pressure type sleeve pipe driving head as claimed in claim 6 is characterized in that the curve slope quantity on the described slips is 2.