CN2385079Y

CN2385079Y - Drillable casing automatic fill-up float shoe

Info

Publication number: CN2385079Y
Application number: CN 99221981
Authority: CN
Inventors: 王盛森
Original assignee: BEIXING INDUSTRY AND TRADE CORP SHENGLI OIL FIELD DRILLING CORP
Current assignee: BEIXING INDUSTRY AND TRADE CORP SHENGLI OIL FIELD DRILLING CORP
Priority date: 1999-08-13
Filing date: 1999-08-13
Publication date: 2000-06-28
Anticipated expiration: 2009-08-13

Abstract

The utility model relates to an automatic sludge filling float shoe for a drillable casing tube, which belongs to a control device when a casing tube is run during oil well drilling. The utility model is characterized in that the inner upper part of a body (1) is provided with a valve seat (2) which is combined with a sealed hemisphere (3), and the lower side of the sealed hemisphere (3) is provided with a spring (4), a supporting seat (5) and a clamping tile (6). The casing tube device has simple operation. After the casing tube is descended into a well, the casing tube does not need to be controlled manually. The utility model can automatically fill sludge. If the sludge does not need to be filled automatically, the clamping tile on the float shoe can be removed to form a common float shoe. The device can accomplish that a PDC drill bit can drill directly, and the utility model saves the expenses and improves the work efficiency.

Description

The automatic mud grouting float shoe of drillable metal casing

A kind of control device when the utility model belongs to the oil drilling setting of casing.

In oil drilling work, often the bunch tube bottom of using is a block ring, an i.e. ball-and-seat, structure is simpler, the inner no mud of setting of casing process middle sleeve enters, setting of casing is to need regularly to prevent that with the pressure reduction inside and outside the balancing sleeve sleeve pipe from damaging at well head mud grouting in sleeve pipe under the external pressure effect.After the well cementation process was finished, under the effect of sleeve pipe inside and outside differential pressure, block ring was closed, and stoped the outer cement of sleeve pipe to enter in the sleeve pipe, needed ceaselessly moving casing in this device mud grouting process, stoped the sticking card of sleeve pipe, and this device makes casing job discontinuous, and waste is trapped the time.Can not directly bore with " PDC " drill bit, must earlier the choked flow trepan be fallen with rock bit, change the PDC drill bit again and drill, this situation was both lost time, and increased drilling cost, increased labour intensity to the workman again.Original device is to utilize manual method to carry out mud grouting with well head in sleeve pipe, must stop casing job during mud grouting, and it is former easily to cause cutting ferrule to run affairs.

The purpose of this utility model realizes the automatic mud grouting of setting of casing exactly, the key of present technique be in the setting of casing process sealing hemisphere under the effect of slips away from block ring, utilize the sleeve pipe inside and outside differential pressure to realize automatic mud grouting, this device still can play the ball-and-seat effect behind the following intact sleeve pipe.We can bore the float collar or the float shoe of original use by " PDC " drill bit of development, can not directly bore with the PDC drill bit, and the automatic mud grouting float shoe of drillable metal casing is still used the just directly drilling well of PDC drill bit.Form because the composition optimal material of float shoe inside mainly contains synthetic plastics such as polytetrafluoroethylene (PTFE), bakelite, brass, cement, these materials do not have damage to the PDC drill bit, can directly drill.

The utility model is to constitute like this, this device mainly contains several parts and forms, body is the short sleeve of a band box cupling, also there is groove the lower end, top has valve body dead admittedly with filler or cement and body, and middle part sealing hemisphere cooperates with valve seat, and spring compression is set upright and sealed the hemisphere bar, supporting seat is arranged at the bottom, support spring is set upright sealing hemisphere bar, also has slips, blocks sealing hemisphere bar during setting of casing, make hemisphere and valve seat gapped, obtain automatic mud grouting effect, the mud of fetching water in well during well cementation, hemisphere impact lower semisphere at cementing slurry and move down, slips comes off, and makes sealing hemisphere and valve seat play the ball-and-seat effect under spring and well pressure effect.It is the same in float collar or float shoe that this apparatus structure uses, can be general.

This device has been realized the purpose of the automatic mud grouting of setting of casing, compared with prior art, simple to operate, after sleeve pipe begins to go into the well, need not manually to control, even realize the purpose of automatic mud grouting, intact until casing job, make casing job continuous, reduce the possibility of cutting ferrule pipe in the setting of casing process, compare with original device, 3000 meters well can be saved 2.5 hours cased time; This device realizes that the PDC drill bit can bore, and any drill bit all is suitable in present well-digging process; If do not need automatic mud grouting, the slips on the float shoe can be removed and become common float shoe.

Advancing an explanation: Fig. 1 below in conjunction with accompanying drawing is structural representation of the present utility model, and Fig. 2 is several structural representations of this device sealing hemisphere, and Fig. 3 is the another kind of form of structure of this device (float shoe) core.

The utility model primary structure feature is that body (1) internal upper part has valve seat (2) and sealing hemisphere (3) combination, in sealing hemisphere (3) below and spring (4) and supporting seat (5) and slips (6) formation, the main mounting spring (4) of the hemisphere bar (10) of core.The body of accompanying drawing 1 (1) is the short sleeve of band box cupling, top and bottom have groove in the sleeve pipe, the valve seat on top (2) is a block ring, filling material (7) between valve seat (2) and the body (1), middle part sealing hemisphere (3) cooperates with valve seat (2), and by spring (4) compress set upright the sealing hemisphere bar (10), the bottom is supporting seat (5), set upright sealing hemisphere bar (10) in order to support spring, in supporting seat (5) below two lobe slips (6) are installed, block sealing hemisphere bar when making setting of casing, make hemisphere (3) and cooperating of valve seat (2) leave the gap, be convenient to automatic mud grouting effect, the main mounting spring (4) of the hemisphere bar (10) of the core of this device.

By accompanying drawing 2 as can be known, several form of structure of sealing hemisphere (3) are or when being sphere for the valve sealing surface of accompanying drawing A, valve seat (2) sealing surface is taper, perhaps the valve sealing surface as figure B is a sphere, valve seat (2) sealing surface is a sphere, and when the valve sealing surface of figure C was the conical surface, valve seat (2) sealing surface was a taper surface, the valve sealing surface of figure D is the plane, and valve seat (2) sealing surface is the plane.

The hemisphere bar (10) of accompanying drawing 3, spring (4), cramp bar (5) and slips (6) are by being installed in the sealing surface below, be retrofitted in the top of sealing surface, under the effect of spring, hemisphere bar (10) is stuck in the place, inclined-plane of base plate during setting of casing owing to slips (6), make valve seat (2) and hemisphere (3) maintain the gap, under the effect of pressure reduction, the mud in the well just can enter inside pipe casing by this gap and obtain the purpose that setting of casing advances automatic mud grouting when sleeve pipe moved downward.After sleeve pipe was down fixed, the beginning circulating mud when the mud of big discharge capacity impacts, moved down hemisphere downwards, and hemisphere bar (10) overcomes spring force and moves down slips (6) is come off.After stopping circulation, under spring force and mud back pressure, hemisphere (3) and just sealing of valve seat play the ball-and-seat effect, have guaranteed that cement paste does not return fastening annular space in the sleeve pipe, has guaranteed cementing quality.Also have on the basis of as above structure, can be retrofitted in sealing hemisphere place to slips (6), unload the lower end part that is contained in sealing surface, the top that also is sealing surface is equipped with hemisphere bar (10), spring (4), base plate (5), and slips (6) is retrofitted in the lower end part of sealing hemisphere (3), and nut (8) and packing ring (9) are in order to fastening hemisphere bar (10) and spring (4).

This device is connected the bottom of sleeve pipe, also can link to each other with vortex sub at sleeve pipe middle part (the cement type guide shoe place makes the sleeve pipe screw thread into), top links to each other with bunch tube, before the setting of casing,, put slips the downward pull-up of sealing hemisphere bar, under the effect of spring, make on the firm taper hole that is stuck in bracing frame of club, sealing hemisphere separates with valve seat, and the mud during setting of casing in the well can return in the sleeve pipe by valve seat orifice, so during setting of casing, just do not needed, after putting in place under the sleeve pipe, during circulating mud from the downward mud grouting in sleeve pipe top, because the downward impulse force sealing hemisphere of mud has overcome spring pressure and has moved down, slips is come off automatically, after stopping mud circulation, sealing hemisphere and valve seat, just under the spring pressure effect, seal, during the mud of fetching water well cementation, play the ball-and-seat effect, stop the annular space cement paste to enter in the sleeve pipe, reach the purpose of normal well cementation, if when occurring special circumstances in the well and being not suitable for automatic mud grouting, slips is taken down, just becomes general cementing unit.This device is on probation on Shengli Oil Field well drilling of shallow sea platform, and 500 meters of well depths are tried out successfully, and are up-to-standard.

Claims

1, the automatic mud grouting float shoe of drillable metal casing, it is characterized in that body (1) internal upper part has valve seat (2) and sealing hemisphere (3) combination, in sealing hemisphere (3) below and spring (4) and supporting seat (5) and slips (6) formation, the main mounting spring (4) of the hemisphere bar (10) of the core of this device.

2, by the automatic mud grouting float shoe of the described drillable metal casing of claim 1, it is characterized in that body (1) is the sleeve pipe of band box cupling, top and bottom have groove in the sleeve pipe, valve seat (2) is a block ring, filling material (7) between valve seat (2) and the body (1), middle part sealing hemisphere (3) cooperates with valve seat (2), and compresses sealing hemisphere bar (10) by spring (4).

3, by the automatic mud grouting float shoe of the described drillable metal casing of claim 1, it is characterized in that 2 lobes being installed with upper slips (6) in supporting seat (5) below, hemisphere (3) leaves the gap with cooperating of valve seat (2).

4, by the automatic mud grouting float shoe of the described drillable metal casing of claim 1, when the form of structure that it is characterized in that sealing hemisphere (3) has the valve sealing surface to be sphere, valve seat (2) sealing surface is taper, the valve sealing surface is a sphere, valve seat (2) sealing surface is a taper surface, and when the valve sealing surface was the conical surface, valve seat (2) sealing surface was a taper surface, the valve sealing surface is the plane, and valve seat (2) sealing surface is the plane.

5, by the automatic mud grouting float shoe of the described drillable metal casing of claim 1, it is characterized in that the installation of hemisphere bar (10), spring (4), gripper shoe (5) and slips (6), perhaps be retrofitted in below the sealing surface sealing surface above.

6, by the automatic mud grouting float shoe of the described drillable metal casing of claim 1, it is characterized in that sealing surface top installation hemisphere bar (10), spring (4), base plate (5) are installed slips (6) below sealing surface.

7,, it is characterized in that the inner optimal material of forming of this float shoe is made up of polytetrafluoroethylene (PTFE), bakelite, brass, cement or synthetic plastic by the automatic mud grouting float shoe of the described drillable metal casing of claim 1.