Self-filling float valve

Abstract

The application relates to an automatic filling type float valve and relates to the technical field of valve bodies. The automatic filling type float valve comprises a valve body, a shaft plug, a spring, a gasket, a shaft sleeve, a stop block seat and a stop block. The shaft plug is arranged in the inner cavity of the valve body, the shaft sleeve is sleeved on the lower part of the shaft plug, the gasket is sleeved on the shaft plug and located above the shaft sleeve, one end of the spring is connected with the gasket, and the other end of the spring is connected with the shaft sleeve. A center groove is arranged in the lower part of the shaft plug, the top end of the stop block seat is fixedly connected with the bottom end of the shaft sleeve, one end of the stop block is inserted into the center groove, and the other end of the stop block is hingedly connected with the stop block seat. The automatic filling type float valve belongs to a normally open state, the smoothness during drilling is ensured, and the automatic filling type float valve can play a one-way cutting-off role when the downhole pressure is too large or well kick occurs.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valve body, in particular to an automatic filling type float valve. BACKGROUND

[0002] With the global energy consumption year by year, the demand for oil and other major energy resources is increasing year by year, and the mining of oil and gas fields is gradually developing. As we all know, when casing drilling, the resistance will become larger and larger with the increase of depth, so it is necessary to solve the "pressure holding" phenomenon at the lowermost drill joint. Therefore, how to provide an automatic filling type float valve in a normally open state has become a technical problem that technicians in the field need to solve. SUMMARY

[0003] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art, provide an automatic filling type float valve, the automatic filling type float valve is in a normally open state, which ensures the smoothness when drilling, and can also play a one-way cut-off role when the downhole pressure is too large or well kick occurs.

[0004] To achieve the above purpose, the present application provides an automatic filling type float valve, which comprises a valve body, a shaft plug, a spring, a gasket, a shaft sleeve, a stop block seat and a stop block. Wherein, the shaft plug is arranged in the inner cavity of the valve body, the shaft sleeve is sleeved on the lower part of the shaft plug, the gasket is sleeved on the shaft plug and located above the shaft sleeve, one end of the spring is connected with the gasket and the other end is connected with the shaft sleeve; a central groove is formed in the lower part of the shaft plug, the top end of the stop block seat is fixedly connected with the bottom end of the shaft sleeve, one end of the stop block extends into the central groove and the other end is hingedly connected with the stop block seat.

[0005] Further, two annular grooves are formed in the outer periphery of the valve body, and an outer sealing ring is installed in each of the two annular grooves.

[0006] Further, a ring-shaped recess is formed in the lower end of the shaft sleeve for installing an open blocking ring.

[0007] Further, the shaft plug comprises a shaft plug cone head and a shaft plug rod, the top end of the shaft plug rod is connected with the shaft plug cone head, the central groove is formed at the lower position of the shaft plug rod for fixing the stop block.

[0008] Further, a sealing gasket is sleeved on the shaft plug rod, and the gasket extrudes the sealing gasket on the end face of the shaft plug cone head under the action of the spring.

[0009] Further, a U-shaped groove is formed in the lower center of the stop block seat as a rotating space for the stop block, and a through hole is formed for installing a hole pin shaft, and an open pin passes through the pin shaft hole to lock the hole pin shaft.

[0010] Further, the valve body bottom end is provided with a damping ring groove, and a damping pad is arranged in the damping ring groove.

[0011] The present application has the advantages of:

[0012] The automatic filling type float valve allows drilling fluid to be filled from the bottom, thereby eliminating the risk of fracturing the formation during the drilling process; the automatic filling feature eliminates the "surge effect" when the wellbore is running, thereby preventing the fluctuation of downhole pressure that may cause formation damage; the automatic filling type float valve is provided with a central groove on the shaft plug for fixing the stopper, and the shaft plug is activated by fluid circulation to automatically release the stopper, thereby achieving the complete closure of the float valve. The automatic filling type float valve is in a normally open state, thereby ensuring the smoothness during the drilling process, and also playing a role of one-way cut-off when the downhole pressure is too large or well kick occurs. BRIEF DESCRIPTION OF DRAWINGS

[0013] Fig. 1 The present application has the advantages of:

[0014] Fig. 2 The present application has the advantages of:

[0015] In the drawings:

[0016] 1-valve body, 2-outer sealing ring, 3-shaft plug, 4-sealing pad, 5-gasket, 6-spring, 7-shaft sleeve, 8-stop block seat, 9-open stop ring, 10-pinhole shaft, 11-stop block, 12-open pin, 13-damping pad. DETAILED DESCRIPTION

[0017] To achieve the above-mentioned purposes and effects, the present application employs the following technical means and structure, and the features and functions thereof are described in detail in combination with the preferred embodiments of the present application and the accompanying drawings.

[0018] As shown in the drawings: Figs. 1-2 The present application provides an automatic filling type float valve, which comprises a valve body 1, a shaft plug 3, a gasket 5, a spring 6, a shaft sleeve 7, a stop block seat 8 and a stop block 11. The shaft plug 3 is arranged in the inner cavity of the valve body 1, the shaft sleeve 7 is sleeved on the lower part of the shaft plug 3, the gasket 5 is sleeved on the shaft plug 3 and located above the shaft sleeve 7, one end of the spring 6 is connected with the gasket 5 and the other end is connected with the shaft sleeve 7. A one-piece central groove is formed in the lower part of the shaft plug 3, the top end of the stop block seat 8 is fixedly connected with the bottom end of the shaft sleeve 7, one end of the stop block 11 extends into the central groove and the other end is hingedly connected with the stop block seat 8.

[0019] In this embodiment, two annular grooves are formed in the outer periphery of the valve body 1, and an outer sealing ring 2 is arranged in each of the annular grooves, so that the peripheral sealing effect is very firm and reliable.

[0020] In this embodiment, the lower end of the shaft sleeve 7 is provided with an annular recess for mounting the open retainer 9, so that the shaft sleeve 7 is tightly locked at the lower cone of the valve body 1, and can serve as a fixing system for the normally open state of the shaft plug 3.

[0021] In this embodiment, the shaft plug 3 includes a shaft plug 3 cone and a shaft plug 3 rod; the top end of the shaft plug 3 rod is connected to the shaft plug 3 cone, and the central groove is arranged at the lower position of the shaft plug 3 rod for fixing the stop block 11 and forcibly pulling the spring 6 to reset, so that the float valve is in a normally open state.

[0022] In this embodiment, the shaft plug 3 rod is provided with a sealing gasket 4, and the gasket 5 is used to press the sealing gasket 4 on the end face of the shaft plug 3 cone under the action of the spring 6.

[0023] In this embodiment, the lower center of the stop block seat 8 is provided with a U-shaped groove for the rotation space of the stop block 11, and a through hole is provided for mounting the hole pin shaft 10, and the open pin 12 passes through the pin shaft hole for locking the hole pin shaft 10, so that it does not fall off during work. At this time, the spring 6, the shaft sleeve 7, the stop block seat 8, the open retainer 9, the hole pin shaft 10, the stop block 11 and the open pin 12 are combined to form a "normally open control system".

[0024] In this embodiment, the bottom end of the valve body 1 is provided with a shock absorbing ring groove, and the shock absorbing ring groove is provided with a shock absorbing pad 13.

[0025] The automatic filling type float valve of the present application allows the drilling fluid to be filled from the bottom, thereby eliminating the risk of fracturing the formation during the drilling process; when running in the wellbore, the automatic filling feature eliminates the "surge effect", preventing the downhole pressure fluctuations that can cause formation damage; the automatic filling type float valve is provided with a central groove on the shaft plug 3 for fixing the stop block 11, and the shaft plug 3 is activated by fluid circulation to automatically release the stop block 11, achieving complete closure of the float valve. The automatic filling type float valve is in a normally open state, ensuring smoothness during drilling, and also serving as a one-way cutoff when the downhole pressure is too high or well kick occurs.

[0026] The working principle of the present application is as follows:

[0027] The automatic filling type float valve is in a normally open state during the drilling process, reducing resistance and enabling smooth drilling. During the drilling process, when the drilling fluid flows through the shaft plug cone, the spring is further compressed, the shaft plug rod moves downward, and the displacement of the long strip central groove of the shaft plug rod and the stop block changes. The stop block seat is separated from the long strip central groove under the action of gravity and the pushing force of the drilling fluid, and the stop block returns to a free state during the subsequent drilling process.

[0028] When the drilling is stopped or the downhole pressure is too large, the shaft plug is reset under the action of the spring, the outer conical surface of the shaft plug head is attached to the matching part of the inner cavity of the valve body, the outer conical surface of the sealing gasket is also attached to the matching part of the inner cavity of the valve body, and both play a reverse cut-off role, effectively playing an internal blowout prevention role.

[0029] The above is only the preferred embodiment of the present application, and does not limit the technical scope of the present application in any way. Therefore, any slight modification, equivalent change and modification of the above embodiment according to the technical essence of the present application still falls within the scope of the technical solution of the present application.

Claims

1. An automatic filling float valve, characterized in that, include: The valve body comprises a piston, a spring, a gasket, a bushing, a stop block seat, and a stop block. The piston is disposed within the inner cavity of the valve body. The bushing is fitted onto the lower part of the piston. The gasket is fitted onto the piston and positioned above the bushing. One end of the spring is connected to the gasket, and the other end is connected to the bushing. A central groove is formed in the lower part of the piston. The top end of the stop block seat is fixedly connected to the bottom end of the bushing. One end of the stop block extends into the central groove, and the other end is hinged to the stop block seat. A U-shaped groove is provided at the lower center of the stop block seat to serve as a rotation space for the stop block; and a through hole is provided to install a perforated pin, with a cotter pin passing through the pin hole to lock the perforated pin. Under the influence of gravity and drilling fluid, the stop block detaches from the long central groove, and during subsequent drilling operations, the stop block returns to its free state.

2. The automatic filling float valve as described in claim 1, characterized in that, The valve body has two annular grooves on its outer periphery, and an outer sealing ring is installed in each of the two annular grooves.

3. The automatic filling float valve as described in claim 1, characterized in that, The lower end of the bushing has an annular groove for installing an open retaining ring.

4. An automatic filling float valve as described in claim 1, characterized in that, The piston includes a piston cone and a piston rod; the top end of the piston rod is connected to the piston cone, and the central groove is formed at the lower position of the piston rod for fixing a stop block.

5. An automatic filling float valve as described in claim 4, characterized in that, A sealing gasket is fitted on the piston rod, and the gasket is pressed against the end face of the piston cone by the action of the spring.

6. An automatic filling float valve as described in claim 1, characterized in that, The bottom end of the valve body is provided with a shock-absorbing ring groove, and a shock-absorbing pad is provided inside the shock-absorbing ring groove.

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