CN212406677U - External sealed floating valve device of casing - Google Patents

Abstract

The utility model relates to a well cementation well completion construction field discloses a sleeve pipe external seal formula float valve device, and it mainly comprises two parts of packing mechanism and float valve mechanism, and wherein the packing mechanism mainly comprises parts such as packing body, feed liquor end cap, check valve, packing element and sealing washer, and float valve mechanism mainly comprises parts such as float valve body, case, spring, upper valve, lower valve and guide shoe. The utility model discloses can replace the flotation device who uses in the conventional well cementation operation, play the effect of one-way back pressure valve, ensure that the cementing completion back grout does not return to the intraductal, more importantly can accomplish at the well cementation plug and bump the pressure back, continue to suppress the pressure and open the packing mechanism, the annular space between packing sleeve pipe and well wall plays the effect that prevents the cement paste and subside, improve the well cementation quality of casing shoe department, construction condition convenient for subsequent job execution.

Description

External sealed floating valve device of casing

Technical Field

The utility model belongs to the technical field of well cementation and completion construction and specifically relates to a sleeve pipe external seal formula float valve device.

Background

The conventional operation procedures of well cementation operation in oil drilling engineering are as follows: the lower part of the casing is connected with a float collar and a float shoe which are provided with one-way back pressure valves, the casing is put into a downhole design position, cement slurry is injected into the casing, a well cementation rubber plug is pressed in, then the drilling fluid is used for replacing the cement slurry into an annular space between the casing and a well wall, finally the well cementation rubber plug is pressed against the position of the float collar, and finally the well cementation rubber plug is set. The problems that often occur with this method of cementing are mainly two-fold: firstly, the one-way valve of the float collar and the float shoe fails, so that cement paste returns to the casing pipe and only can be set for waiting time; secondly, the cement paste in the section close to the casing shoe is possibly low in strength due to sedimentation, the cement paste at the position can be cracked due to vibration when the cement plug is drilled in the later period, and if the layer of casing is a technical casing, when the next drilling is carried out, the annular cement paste at the position of the casing shoe can be completely dropped even due to multiple times of drilling.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve above-mentioned technical problem and provide a sleeve pipe external packing formula float valve device, the device is unique seals the design that separates the mechanism, can effectual solution sleeve pipe shoe section well cementation not good quality's problem.

In order to solve the technical problem, the utility model discloses a following technical scheme:

a sleeve external sealed float valve device comprises a sealing mechanism and a float valve mechanism, wherein inner cavities of the sealing mechanism and the float valve mechanism are communicated and are coaxially arranged up and down;

the packing mechanism comprises a packing body, a liquid inlet plug, a one-way valve, a rubber cylinder and a sealing ring, wherein the upper part of the packing body is provided with a casing joint and is used for being connected with a casing in series;

the floating valve mechanism comprises a floating valve body, a valve core, a spring, an upper valve, a lower valve and a guide shoe, wherein the upper end of the floating valve body is fixedly connected to the lower part of the packing body, the lower end of the floating valve body is fixedly connected with the guide shoe, the upper valve and the lower valve are of equal circular plate-shaped structures and are coaxially matched and installed inside the floating valve body from top to bottom, a water hole is formed in the middle of the upper valve, an arc-shaped sealing surface is formed on the lower portion of the water hole, a guide hole is formed in the middle of the lower valve, a plurality of small through holes are formed in the periphery of the guide hole, the valve core comprises a core rod and a sealing head, the core rod can be movably inserted into the guide hole from top to bottom, the sealing head is fixedly connected to the upper end of the core rod, and the.

Preferably, the feed liquor hole is two and the symmetry radially runs through and opens on packing and separating the body inner wall, correspondingly, the feed liquor end cap be two and sealing installation on two feed liquor holes one-to-one, correspondingly, the check valve be two and set up between two feed liquor holes and packing element one-to-one.

Preferably, the liquid inlet plug is made of a brittle material, so that the well cementation rubber plug can break the liquid inlet plug and smoothly break the liquid inlet hole.

Preferably, the glue cylinder comprises an inner glue layer and an outer glue layer, and a metal support sheet is arranged between the two glue layers.

Preferably, the upper end of the guide hole of the lower valve is stepped and is fitted with a spring.

Preferably, the number of the small through holes is 6, and the small through holes are uniformly distributed in the circumferential direction.

Preferably, the sealing head is made of rubber.

Preferably, the outer diameters of the upper valve and the lower valve are matched with the inner diameter of the float valve body, and the upper valve and the lower valve are in sealing connection with the float valve body through threads.

Preferably, the upper end of the float valve body is in sealing connection with the lower part of the packing body through threads.

The utility model has the advantages that: the utility model discloses a brand-new sleeve pipe external seal formula float valve device, can replace the floating installation who uses in the conventional well cementation operation, play the effect of one-way back pressure valve, guarantee that the cementing is accomplished the back grout and not return to the intraductal, more importantly can accomplish to bump the back of pressing at the well cementation plug, continue to suppress and open the packing mechanism, the annular space between packing sleeve pipe and well wall plays the annular space that prevents the grout and subsides, improve the well cementation quality's of casing shoe department effect, construction condition convenient is provided for subsequent operation construction.

Drawings

Fig. 1 is a schematic view of the overall structure of the external casing sealed float valve device of the present invention;

FIG. 2 is a schematic structural view of a well cementing rubber plug used in conjunction with the present invention;

FIG. 3 is a schematic structural view of a cementing rubber plug passing through a packing mechanism;

FIG. 4 is a schematic structural view of expansion seal of a rubber cylinder after the well cementation rubber plug is pressed.

The sealing device comprises a sealing body 1, a liquid inlet plug 2, a check valve 3, a rubber cylinder 4, a floating valve body 5, a valve core 6, a guide shoe 7, an upper valve 8, a spring 9, a lower valve 10, a sealing ring 11 and a well cementing rubber plug 12.

Detailed Description

The invention will be described in further detail with reference to the accompanying drawings:

referring to fig. 1, the utility model discloses a casing is outer to be sealed formula float valve device mainly comprises two parts of packing mechanism and float valve mechanism, and packing mechanism mainly comprises parts such as packing body 1, feed liquor end cap 2, check valve 3, packing element 4 and sealing washer 11, and float valve mechanism mainly comprises parts such as float valve body 5, case 6, spring 9, upper valve 8, lower valve 10 and guide shoe 7.

The packing mechanism: the upper end of the packing body 1 is a casing joint which can be connected with a casing string; the two liquid inlet plugs 2 are made of brittle materials such as nylon and are symmetrically distributed on the inner wall of the packing body 1 and are arranged on the two liquid inlet holes, and the main function is to ensure that the packer (rubber sleeve 4) cannot be opened due to liquid inlet in advance before operation; each liquid inlet hole is correspondingly provided with a one-way valve 3, the inlet end of each one-way valve 3 is communicated with the corresponding liquid inlet hole, and the outlet end of each one-way valve 3 is communicated to the inside of the rubber cylinder 4 through a fluid channel arranged on the rubber cylinder 4, and the main function is that liquid can only enter the rubber cylinder 4 through the one-way valve 3 after entering the rubber cylinder 4 from the liquid inlet hole, so that the rubber cylinder 4 is expanded and plays a role of sealing, but the liquid can not flow back from the rubber cylinder 4 again, namely the liquid can only enter the rubber cylinder but can not exit the rubber cylinder; the rubber cylinder 4 comprises three layers, two rubber layers are arranged inside and outside, the middle layer is a metal supporting sheet, and the upper end and the lower end of the rubber cylinder 4 are sealed with the packing body 1 through the sealing rings 11.

A float valve mechanism: the upper valve 8 and the lower valve 10 are both in a circular plate-shaped structure, and the upper valve 8 and the lower valve 10 are connected with the float valve body 5 through threads; a water hole is formed in the center of the upper valve 8, penetrates through the water hole from top to bottom, and is an arc-shaped sealing surface at the lower part; the center of the lower valve 10 is provided with a guide hole with steps, the guide hole is arranged in a vertically penetrating manner, 6 small through holes are uniformly distributed on the periphery of the guide hole, and the design of the steps can facilitate the positioning and assembly of the spring 9; the valve core 6 mainly comprises a core rod and a sealing head, the sealing head is made of rubber, the valve core 6 enables the sealing head to be in contact with an arc-shaped sealing surface of the upper valve 8 through a spring 9, a structure similar to a one-way valve is formed, and liquid is prevented from flowing back; the guide shoe 7 mainly plays a guiding role in the running process of the casing; the float valve mechanism is finally connected with the packing mechanism through threads, and specifically, the upper end of the float valve body 5 is connected with the lower part of the packing body 1 through threads.

As shown in fig. 2 to 4, the guide shoe 7 of the float valve mechanism can play a guiding role when the pipe string is lowered, and prevent the pipe string from being wedged into the well wall. In the process of well cementation construction, when the well cementation rubber plug 12 descends to the packing mechanism, the liquid inlet plug 2 is broken firstly, a liquid inlet hole is punched, then the well cementation rubber plug 12 continues to descend to the upper valve 8 of the floating valve mechanism to be pressed, displacement liquid enters the rubber barrel 4 from the liquid inlet hole, and the rubber barrel 4 expands outwards along with the rise of pressure to realize the packing effect.

The utility model discloses an in the well cementation completion construction that the device was mainly used for among the oil drilling engineering, its main effect lies in: the device can replace the conventional well cementation floating device, plays a role of a one-way back pressure valve and ensures that cement paste does not return to the casing after well cementation is finished; and secondly, after the well cementation rubber plug 12 is pressed, the pressure is continuously suppressed to open the packing mechanism, so that the annular space between the casing and the well wall can be packed, the effects of preventing cement slurry from settling and improving the well cementation quality of the casing shoe section are achieved, and the cement slurry caused by the failure of the float valve can be further prevented from flowing back.

In summary, the present invention is not limited to the above embodiments, and those skilled in the art can provide other embodiments within the technical teaching of the present invention, but these embodiments are included in the scope of the present invention.

Claims (9)

1. A sleeve external-sealed floating valve device is characterized by comprising a sealing mechanism and a floating valve mechanism, wherein inner cavities of the sealing mechanism and the floating valve mechanism are communicated and are coaxially arranged up and down;

the packing mechanism comprises a packing body, a liquid inlet plug, a one-way valve, a rubber cylinder and a sealing ring, wherein the upper part of the packing body is provided with a casing joint and is used for being connected with a casing in series;

the floating valve mechanism comprises a floating valve body, a valve core, a spring, an upper valve, a lower valve and a guide shoe, wherein the upper end of the floating valve body is fixedly connected to the lower part of the packing body, the lower end of the floating valve body is fixedly connected with the guide shoe, the upper valve and the lower valve are of equal circular plate-shaped structures and are coaxially matched and installed inside the floating valve body from top to bottom, a water hole is formed in the middle of the upper valve, an arc-shaped sealing surface is formed on the lower portion of the water hole, a guide hole is formed in the middle of the lower valve, a plurality of small through holes are formed in the periphery of the guide hole, the valve core comprises a core rod and a sealing head, the core rod can be movably inserted into the guide hole from top to bottom, the sealing head is fixedly connected to the upper end of the core rod, and the.

2. The external casing sealed type float valve device of claim 1, wherein said liquid inlet holes are two and symmetrically and radially penetrating the inner wall of the sealed body, correspondingly, two liquid inlet plugs are hermetically mounted on the two liquid inlet holes in a one-to-one correspondence, and correspondingly, two check valves are disposed between the two liquid inlet holes and the rubber cylinder in a one-to-one correspondence.

3. The external sealed float valve assembly of claim 1, wherein said inlet plug is made of a brittle material.

4. The external sealed float valve device of claim 1, wherein said rubber cylinder comprises an inner rubber layer and an outer rubber layer, and a metal support sheet is further disposed between the two rubber layers.

5. The floating valve assembly of claim 1, wherein the upper end of the guide hole of the lower valve is stepped and is assembled with a spring.

6. The external sealed float valve device of claim 1, wherein said small through holes are 6 and circumferentially distributed.

7. The external sealed float valve assembly of claim 1, wherein said sealing head is made of rubber.

8. The external sealed float valve assembly of claim 1 wherein said upper and lower valves have outer diameters matching the inner diameter of the float valve body and are sealingly connected to the float valve body by threads.

9. The out-of-casing sealed float valve assembly of claim 1 wherein said float valve body upper end is threadably sealingly connected to the lower portion of the packing body.

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