CN209959211U - Elastic self-guiding float shoe - Google Patents

Abstract

The utility model belongs to the oil field instrument field in the pit especially relates to an elasticity self-conductance formula float shoe, including barrel subassembly, disk seat, valve head, valve rod, spring A, cross liquid supporting seat and direction head, the structure of barrel subassembly includes barrel and lower barrel, goes up barrel and lower barrel sliding connection, the direction head pass through threaded connection at the lower extreme of barrel down, go up and be provided with spring B between the lower extreme of barrel and the upper end of direction head, the outside of going up the barrel lower extreme is provided with the direction slide, the direction slide is located the outside of the district's section of barrel coincidence under with on the barrel, the side of lower barrel be provided with the uide pin that the direction slide matches. The utility model discloses meeting and hindering the back, through lifting and below sleeve pipe, can force the direction head rotatory under the effect of direction slide and uide pin, then bypass the barrier through the principle the same with current rotatory direction float shoe, reach the purpose of relieving the hindrance, eliminated the rotatory blind area of direction head simultaneously.

Description

Elastic self-guiding float shoe

Technical Field

The utility model belongs to the oil field instrument field in the pit especially relates to an elasticity self-conductance formula float shoe.

Background

The float collar (or float shoe) is a more common auxiliary tool for well cementation, in which a one-way valve is set, when it is used, the float shoe is connected with lowest end of casing pipe, and together with float collar it can be formed into two-stage one-way back-pressure valve. And opening the slurry replacing process, and closing the casing and the cement when waiting for setting. The floating shoes are often blocked and blocked in the process of going into the well, and a lot of adverse effects are brought to production. In order to solve the problem, a technical person designs a rotary self-guide type floating shoe, wherein a guide head (namely a monk head) of the floating shoe is of an eccentric structure and can freely rotate, and if a resistance occurs in the process of casing running, the guide head can rotate under the action of resistance, so that the obstacles are bypassed, and the floating shoe can smoothly run downwards. However, when the guide head is opposite to the obstacle, the guide head cannot rotate, namely, a rotation blind area exists, and the floating shoe can still be blocked when the floating shoe is in the blind area. In addition, in the existing float collar or float shoe, the spring for supporting the valve head is often exposed outside and is easily wound by the polymer in the well cementation medicament and is difficult to rebound, thereby causing the problem that the one-way valve is not closed tightly.

Disclosure of Invention

The utility model provides an elasticity self-conductance formula float shoe to solve the problem of proposing among the above-mentioned background art.

The utility model provides a technical problem adopt following technical scheme to realize: the utility model provides an elastic self-guiding float shoe, which comprises a cylinder component, a valve seat, a valve head, a valve rod, a spring A, a liquid passing supporting seat and a guiding head, wherein the valve head is fixedly connected at the upper end of the valve rod, the lower end of the valve rod is inserted into a round hole in the center of the liquid passing supporting seat and slides along the hole wall, the valve head and the valve rod always keep away from the movement trend of the liquid passing supporting seat under the action of the spring A, the guiding head is connected at the lower end of the cylinder component through threads, the guiding head is of an eccentric structure, the cylinder component structure comprises an upper cylinder and a lower cylinder, the upper cylinder and the lower cylinder are in sliding connection, the guiding head is connected at the lower end of the lower cylinder through threads, a spring B is arranged between the lower end of the upper cylinder and the upper end of the guiding head, the lower cylinder and the guiding head keep away from the movement trend of the upper, the guide slideway is positioned on the outer side of the section of the upper barrel body, which is overlapped with the lower barrel body, the side surface of the lower barrel body is provided with a guide pin matched with the guide slideway, one end of the guide pin is fixedly connected on the lower barrel body, and the other end of the guide pin is inserted into the guide slideway;

the guide slideway is of a zigzag structure, two ends of the zigzag structure are connected end to end, so that a closed groove-shaped structure is formed on the outer surface of the upper barrel, an inclined groove section is arranged in the guide slideway, the upper barrel and the lower barrel move axially relative to each other when the casing is lifted up or put down, and in the process, the guide pin rotates around the central axis of the barrel assembly under the guide effect of the inclined groove section in the guide slideway, so that the lower barrel and the guide head are driven to rotate;

the lower end of the valve head and the upper end of the liquid passing supporting seat are matched in a plugging mode, a closed annular space used for containing a spring A is formed between the valve head and the valve rod, and the spring A is arranged in the annular space.

The liquid passing supporting seat is provided with a piston hole, a piston is arranged in the piston hole and fixedly connected to the lower end of the valve rod, and a sealed negative pressure cavity is formed in the upper side of the piston.

The utility model has the advantages that:

1. the utility model discloses meeting and hindering the back, through lifting and below sleeve pipe, can force the direction head rotatory under the effect of direction slide and uide pin, then bypass the barrier through the principle the same with current rotatory direction float shoe, reach the purpose of relieving the hindrance, eliminated the rotatory blind area of direction head simultaneously.

2. The utility model discloses with spring A as for in a relative confined space (not sealed), can prevent effectively that spring A from being twined by the polymer.

3. The utility model discloses set up the negative pressure chamber, the effect of accessible negative pressure assists closing of check valve to the reliability that the check valve is sealed has been improved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a schematic view of a planar deployment of the guide chute.

In the figure: 1-upper cylinder, 2-valve seat, 3-valve head, 4-valve rod, 5-spring A, 6-liquid passing support sleeve, 7-spring B, 8-lower cylinder, 9-guide head, 10-guide pin, 11-guide slideway, 12-piston, 13-negative pressure cavity and 14-inclined groove section.

Detailed Description

The invention is further described below with reference to the accompanying drawings:

this embodiment includes the barrel subassembly, valve seat 2, valve head 3, valve rod 4, spring A5, cross liquid supporting seat 6 and guide head 9, valve head 3 fixed connection is in the upper end of valve rod 4, the lower extreme of valve rod 4 is inserted in the round hole of crossing liquid supporting seat 6 central authorities and is slided along the pore wall, valve head 3 and valve rod 4 remain throughout under the effect of spring A5 and keep away from the trend of crossing liquid supporting seat 6, guide head 9 passes through threaded connection at the lower extreme of barrel subassembly, guide head 9 is eccentric structure. The above is a common structure in the prior art, and is not described herein again.

The structure of barrel subassembly includes barrel 1 and lower barrel 8, and barrel 1 and lower barrel 8 sliding connection go up, direction head 9 pass through threaded connection at the lower extreme of barrel 8 down, be provided with spring B7 between the lower extreme of last barrel 1 and the upper end of direction head 9, lower barrel 8 and direction head 9 keep along the motion trend of axial away from last barrel 1 under the effect of spring B7, the outside of going up barrel 1 lower extreme is provided with guide slide 11, guide slide 11 is located the outside of the section of going up barrel 1 with lower barrel 8 coincidence, the side of lower barrel 8 be provided with guide pin 10 with guide slide 11 matches, the one end fixed connection of guide pin 10 is on barrel 8 down, the other end insert in guide slide 11. When meeting with a block, the spring B7 is compressed, the guide head 9 rotates a certain angle in the compression process, if the angle is still not enough to bypass the obstacle, the sleeve is lifted, the guide head 9 rotates a certain angle again, and the steps are repeated, and finally the guide head 9 rotates a proper angle to bypass the obstacle with minimum resistance. It can be seen that, the utility model discloses meeting and hindering the back, through lifting and transferring the sleeve pipe, can force direction head 9 rotatory under the effect of direction slide 11 and uide pin 10, bypass the barrier through the principle the same with current rotatory direction float shoe then, reach and remove the purpose that hinders, eliminated the rotatory blind area of direction head 9 simultaneously. In addition, the utility model discloses with spring A5 to in a relative confined space (not sealed), can prevent effectively that spring A5 from being twined by the polymer.

The guide slideway 11 is of a zigzag structure, two ends of the zigzag structure are connected end to end, so that a closed groove-shaped structure is formed on the outer surface of the upper barrel body 1, an inclined groove section is arranged in the guide slideway 11, the upper barrel body 1 and the lower barrel body 8 move axially relative to each other when a casing is lifted up or lowered down, and in the process, the guide pin 10 rotates around the central axis of the barrel body assembly under the guide effect of the inclined groove section 14 in the guide slideway 11, so that the lower barrel body 8 and the guide head 9 are driven to rotate.

The lower end of the valve head 3 is matched with the upper end of the liquid passing supporting seat 6 in an inserted manner, a closed annular space for accommodating a spring A5 is formed between the valve head 3 and the valve rod 4, and the spring A5 is arranged in the annular space.

The liquid passing supporting seat 6 is provided with a piston hole, a piston 12 is arranged in the piston hole, the piston 12 is fixedly connected to the lower end of the valve rod 4, a sealed negative pressure cavity 13 is arranged on the upper side of the piston 12, and gas not larger than standard atmospheric pressure is filled in the negative pressure cavity. The utility model discloses set up negative pressure chamber 13, the effect of accessible negative pressure assists closing of check valve to the reliability that the check valve is sealed has been improved.

Claims (2)

1. The utility model provides an elasticity self-conductance formula float shoe, including the barrel subassembly, disk seat (2), valve head (3), valve rod (4), spring A (5), cross liquid supporting seat (6) and direction head (9), valve head (3) fixed connection is in the upper end of valve rod (4), the lower extreme of valve rod (4) is inserted in the round hole of crossing liquid supporting seat (6) central authorities and is slided along the pore wall, valve head (3) and valve rod (4) remain throughout under the effect of spring A (5) and keep away from the motion trend of crossing liquid supporting seat (6), direction head (9) are through threaded connection at the lower extreme of barrel subassembly, direction head (9) are eccentric structure, its characterized in that:

the structure of the cylinder component comprises an upper cylinder (1) and a lower cylinder (8), the upper cylinder (1) is connected with the lower cylinder (8) in a sliding way, the guide head (9) is connected with the lower end of the lower cylinder body (8) through threads, a spring B (7) is arranged between the lower end of the upper cylinder body (1) and the upper end of the guide head (9), the lower cylinder body (8) and the guide head (9) keep the movement trend of being far away from the upper cylinder body (1) along the axial direction under the action of the spring B (7), a guide slideway (11) is arranged on the outer side of the lower end of the upper cylinder body (1), the guide slideway (11) is positioned on the outer side of a section of the upper cylinder body (1) which is overlapped with the lower cylinder body (8), a guide pin (10) matched with the guide slide way (11) is arranged on the side surface of the lower cylinder body (8), one end of the guide pin (10) is fixedly connected to the lower cylinder body (8), and the other end of the guide pin is inserted into the guide slide way (11);

the guide slideway (11) is of a zigzag structure, two ends of the zigzag structure are connected end to end, so that a closed groove-shaped structure is formed on the outer surface of the upper barrel (1), an inclined groove section is arranged in the guide slideway (11), the upper barrel (1) and the lower barrel (8) move axially relative to each other when a casing is lifted up or lowered down, and in the process, the guide pin (10) rotates around the central axis of the barrel assembly under the guide effect of the inclined groove section (14) in the guide slideway (11), so that the lower barrel (8) and the guide head (9) are driven to rotate;

the lower extreme of valve head (3) and the upper end of crossing liquid supporting seat (6) through the grafting cooperation to form a confined annular space that is used for holding spring A (5) between valve head (3) and valve rod (4), spring A (5) set up in this annular space.

2. The elastic self-guiding float shoe according to claim 1, wherein: the liquid passing supporting seat (6) is provided with a piston hole, a piston (12) is arranged in the piston hole, the piston (12) is fixedly connected to the lower end of the valve rod (4), and a sealed negative pressure cavity (13) is arranged on the upper side of the piston (12).