CN212928152U - Oil-gas mixed-discharge oil well pump - Google Patents

Abstract

The utility model discloses an oil gas mixed discharge oil-well pump that oil production well used, this oil-well pump include pump barrel and plunger, install the plunger both ends in the pump barrel and be equipped with the upper reaches respectively and move valve and the valve is moved to the low reaches, what the pump barrel lower extreme was connected is the biasing standing valve, and the biasing standing valve is equipped with inlet channel, fixed valve ball and feed liquor hole, and fixed valve ball is installed between inlet channel and feed liquor hole, and inlet channel and fixed valve ball biasing are in centre bore one side of biasing standing valve, the below of biasing standing valve is equipped with heavy liquid cavity, and when oil gas mixed discharge oil-well pump was in the bottom dead center, the plunger can get into heavy liquid cavity. The utility model discloses can be used for the gas-oil ratio to be greater than 300 oil well, guarantee the normal production of oil well. Along with the extraction of gas, under the condition of reciprocating motion of a sucker rod in the production string, well liquid is stirred, a gas cap effect is formed, the rapid discharge of the well liquid is facilitated, the productivity is increased, and the production cost is reduced.

Description

Oil-gas mixed-discharge oil well pump

Technical Field

The utility model relates to an oil-well pump among the oil production well of oil industry, especially an oil gas mixed discharge oil-well pump is particularly suitable for the oil production well use that the gas-oil ratio is high.

Background

At present, a conventional oil well pump used in an oil production well in the petroleum industry mainly comprises a pump cylinder, a plunger and a fixed valve, wherein two ends of the plunger are connected with an upper movable valve and a lower movable valve, and the fixed valve is connected at the lower end of the pump cylinder and is positioned below the lower movable valve. When the conventional oil well pump is used in an oil well with high gas-oil ratio, gas in stratum liquid production often remains in a cavity between the lower traveling valve and the fixed valve to form a gas storage cavity, so that the pump efficiency is reduced, and the oil well pump is subjected to gas lock phenomenon in severe cases to influence the oil extraction of an oil production well.

The airlock phenomenon of the oil well pump is caused by the fact that after gas exists between a downstream movable valve and a fixed valve, the movable valve and the fixed valve cannot be opened, and the oil well cannot output liquid. After the air lock phenomenon occurs, when the bottom pressure is not enough to overcome the liquid column pressure in the descending process of the plunger of the oil well pump, the upstream movable valve and the downstream movable valve can not be opened; in the process of ascending the plunger of the oil well pump, the fixed valve cannot be opened due to gas expansion. The plunger of the oil well pump is dry pumped in the pump barrel, so that the liquid on the ground of the oil well does not flow out, and the normal production of the oil well is influenced.

Because the liquid level in the pump barrel is reduced after gas exists between the downstream movable valve and the fixed valve, the plunger of the conventional oil well pump can generate a liquid impact phenomenon in the descending process, and the plunger suddenly encounters liquid level obstruction to deform a sucker rod string, so that the sucker rod string is deformed, the frequent friction between the sucker rod string and an oil pipe is caused, the service life of the sucker rod string is greatly reduced, and the maintenance-free period of the oil well is shortened. Meanwhile, the normal pumping rod string generates alternating load in the up and down movement process, and the damage speed of the pumping equipment is increased.

In order to eliminate the phenomenon, a degasser is installed under an oil well oil pump with a high oil-gas ratio at present, the degasser mainly adopts a sieve tube, a gas anchor, a gas-sand anchor and the like and can remove a part of gas, but the degasser under the pump has limited gas separation effect, only can discharge a part of gas into a sleeve, cannot completely eliminate the gas influence, and cannot realize gas-liquid mixed pumping. Meanwhile, under the condition that the gas is forbidden to be discharged through the sleeve and the atmospheric pollution is prevented at present, in the oil production well with the gas-oil ratio of more than 300, because the gas in the downhole production liquid can not be discharged through the sleeve, the currently adopted gas-off preventing device can not play a role in preventing the gas from being discharged, and the downhole oil-well pump is very easy to form a gas lock phenomenon, so that the normal production of the oil well is influenced, and a certain yield loss is caused.

Through search, the following products can also achieve the degassing effect:

the application number is 200620087264.6's high oil-gas ratio well oil-gas separation device, the device include oil pipe joint, right piece, outer tube, inner tube and sliding sleeve, installed annular spiral muscle between interior outer tube, constitute the spiral runner, and sliding sleeve, lower extreme and the centrifugal pump of diving are installed to the outer tube lower part and are linked to each other, can play certain degasification gas-proof effect, avoid gas to carry out in the oil-well pump.

The application number is 200620088468.1's axial-flow type oil gas pump that thoughtlessly takes out in pit, including pump core, pump head axle sleeve, a pump section of thick bamboo, pump seat axle sleeve, pump seat, spline and spline housing. The pump core comprises a pump shaft, a sleeve and a key which are arranged on the pump shaft, at least one stage of pressurizing unit arranged on the sleeve and the key, a homogenizer arranged at the lower end of the last stage pressurizing unit and at the upper part of the pump base, friction rings arranged at the upper end surface and the lower end surface of the pressurizing unit, a pump head shaft sleeve and a pump base shaft sleeve which are arranged at two end parts of the pump shaft and a check ring, wherein one end of the pump cylinder is connected with the pump head, and. Can play the role of oil-gas mixed pumping.

The application number is 201521113571.2, and an oil well underground oil gas mixed pump comprises an oil rod coupling, a pull rod, a gas-liquid exchange tank, a limiting valve, a gas-proof sliding valve, a sealing ring, a valve seat, a pump cylinder, a liquid inlet hole, a plunger, a traveling valve, a fixed valve and a fixed valve. The problems of high oil-gas ratio, air lock and the like can be solved, the special structure of the oil well pump enhances the exhaust capacity, the associated gas entering the pump barrel can be effectively and timely discharged, and the oil well yield and the oil well pump efficiency are improved.

Application number is 201820068656.0's high-efficient gas defense device, nipple joint on the upper segment, nipple joint lower part outer wall connection outer tube on the upper segment, the nipple joint is opened to the upper segment has two through-holes of upper and lower direction, the lower part inner wall of a through-hole connects upper segment attach fitting, upper segment attach fitting lower extreme connects middle section internal seal joint, the middle section drain pipe is connected to middle section internal seal joint lower extreme, middle section drain pipe outer wall sets up the flight, middle section seal joint is connected to middle section drain pipe lower extreme, middle section gas sensitive joint is connected to middle section seal joint lower extreme, middle section gas sensitive joint upper portion inner wall, middle section gas sensitive joint upper portion outer wall connection middle section feed. The natural gas in the output liquid can be effectively separated, and the fullness of the pump is improved.

An inner cover type gas-proof device with application number 03251061.6, wherein the middle part of an outer sleeve is provided with a suction inlet, the lower part of an inner cover type defoamer is provided with an exchange cavity and a 70 m separation outer sleeve, the middle part of the outer sleeve is provided with a central pipe to form a separation stage of the gas-proof device, the upper part of the suction inlet is provided with a 12 m discharge outer sleeve and a discharge valve group, the middle part of the outer sleeve is provided with a central pipe to form a discharge stage of the gas-proof device, when gas-containing liquid enters the gas-proof device from the suction inlet and moves upwards to an annular space formed by the upper end of the inner cover type defoamer and the central pipe to change the flow direction and move downwards, bubbles in the liquid with constantly changing flow rate enter the exchange cavity are further separated, the gas-containing liquid in a backflow cavity formed by the 70 m separation outer sleeve and the central pipe flows downwards for a long time without the downward flow capacity of the gas, thereby realizing the purpose of preventing the oil pump from being aerated.

The application number is 00234833.0, a novel air-proof oil well pump, a gas-liquid replacement cavity is designed on the upper part of the existing oil well pump, and a gas-liquid exchange channel is arranged on a pump pipe. The principle of gas-liquid displacement is that the plunger of the oil well pump is used to control the opening and closing of the gas-liquid displacement chamber, so that the gas entering the pump is discharged out of the pump through the gas-liquid displacement chamber and the gas-liquid exchange channel in due time, and the interference of the gas on the normal operation of the oil well pump is eliminated.

However, the above products are either used for oil production wells with electric submersible pumps, or have complicated structures, high manufacturing cost or limited effects. Therefore, the oil well pump which has a simple structure and low manufacturing cost and can simultaneously extract underground oil gas is urgently needed to be developed in a production field.

Disclosure of Invention

The utility model aims at providing an oil-gas mixed discharging oil-well pump solves the airlock phenomenon of oil-well pump among the ordinary oil recovery well that the gas-oil ratio is high, guarantees the normal production of oil recovery well, improves oil well output, reduction in production cost.

The technical solution of the utility model is that:

the utility model provides an oil-gas mixed oil-well pump, includes pump barrel and plunger, installs the plunger both ends in the pump barrel and is equipped with upper reaches respectively and moves valve and low reaches and move the valve, what the pump barrel lower extreme was connected is the bias standing valve, and the bias standing valve is equipped with inlet channel, fixed valve ball and feed liquor hole, and fixed valve ball is installed between inlet channel and feed liquor hole, and inlet channel and fixed valve ball bias are in the centre bore one side of bias standing valve, the below of bias standing valve is equipped with the heavy liquid chamber, and when oil-gas mixed oil-well pump was in the bottom dead center, the plunger can get into the heavy liquid intracavity.

The liquid sinking cavity 5 is provided with a short section or a tail pipe, both ends of the short section or the tail pipe are provided with threads, and both ends of the short section or the tail pipe are respectively connected with the valve body of the offset fixed valve 4 and the plug 6.

The liquid inlet hole is arranged in the hole wall of the central hole of the offset fixed valve, and the distance from the liquid inlet hole to the top of the liquid inlet channel is larger than the radius of the fixed valve ball.

And a sealing ring is arranged on the inner wall of the valve body of the offset fixed valve and is arranged on the upper part of the liquid inlet channel.

The inner diameter of the short section or the tail pipe below the offset fixed valve is larger than the outer diameter of the plunger.

The length of the short section or the tail pipe is larger than the total length of the plunger and the upstream dynamic valve and the downstream dynamic valve which are connected with the two ends of the plunger.

The lower end of the liquid inlet channel can be connected with an anti-fouling pipe, the lower end of the anti-fouling pipe is closed, and dirt blocking holes or dirt blocking grooves are uniformly distributed in the pipe wall.

The aperture of the dirt blocking hole in the pipe wall of the anti-fouling pipe or the width of the dirt blocking groove is smaller than the size of dirt in the used oil well fluid.

Compare with the oil-well pump that uses in the current ordinary oil recovery well, the utility model discloses a show the result of use and be:

in the common oil extraction pump in the prior art, the lower part of a pump barrel is connected with a fixed valve through a coupling, the bottom of a production string is opened, and oil well produced liquid enters the fixed valve from the bottom of the production string and is extracted out of the ground through a plunger of the oil extraction pump. Therefore, the coupling between the pump cylinder and the fixed valve becomes an air storage cavity, air is reserved at the air storage cavity, the plunger cannot be contacted with oil, the oil well pump is very easy to generate an air lock phenomenon, well fluid cannot be extracted, and normal production of the oil well is influenced. The utility model discloses changed original standing valve into the biasing standing valve, and connected nipple joint or tail pipe in the below of biasing standing valve, installed the plug at the lower extreme of nipple joint or tail pipe, the lower extreme of production string has been sealed. The well production fluid can only enter the offset standing valve from the side of the production string, and the nipple or tail pipe connected below the offset standing valve becomes a fluid sinking chamber. The plunger connected with the sucker rod can enter the liquid sinking cavity when the bottom dead center, and gas above the offset fixed valve and liquid are mixed and extracted in the process that the plunger enters the liquid sinking cavity downwards, so that the gas lock phenomenon of the oil well pump caused by gas expansion and compression is eliminated, and meanwhile, the gas-liquid mixed pumping and the boosting oil well lifting are realized by utilizing the characteristic of gas expansibility. The utility model discloses a show the effect and still lie in:

1. the utility model discloses can be used for the oil well that the gas-oil ratio is greater than 300, under the condition of not discharging sleeve pipe gas, the utility model discloses the airlock phenomenon can not take place, has guaranteed the normal production of oil well.

2. Along with the extraction of gas, under the condition of the reciprocating motion of the sucker rod in the production string, the well liquid is stirred, the gas can be separated and gathered at an accelerated speed to form a gas cap effect, the well liquid is discharged quickly, the productivity is increased, and the production cost is reduced.

3. After the oil well pump is used, the plunger cannot suffer from liquid impact, the sucker rod string cannot deform and lose stability, the service life of the sucker rod string is prolonged, and oil pumping equipment is protected.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram of the present invention.

In the figure: the oil pumping rod column 1, the pump barrel 2, the plunger 3, the offset fixed valve 4, the liquid inlet channel 41, the fixed valve ball 42, the sealing ring 43, the liquid inlet hole 44, the liquid sinking cavity 5, the plug 6 and the anti-pollution pipe 7

Detailed Description

The drawings are for reference and illustration purposes only and are not intended to limit the scope of the present disclosure. The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, the oil-gas mixed oil-well pump comprises a pump cylinder 2 and a plunger 3, wherein an upstream movable valve and a downstream movable valve are respectively arranged at two ends of the plunger 3 arranged in the pump cylinder 2, a bias fixed valve 4 is connected to the lower end of the pump cylinder 2, the bias fixed valve 4 is provided with a liquid inlet channel 41, a fixed valve ball 42 and a liquid inlet hole 44, the fixed valve ball 42 is arranged between the liquid inlet channel 41 and the liquid inlet hole 44, the liquid inlet channel 41 and the fixed valve ball 42 are biased at one side of a central hole of the bias fixed valve 4, a liquid sinking cavity 5 is arranged below the bias fixed valve 4, and when the oil-gas mixed oil-well pump is positioned at a bottom dead center, the plunger 3 can enter the liquid sinking cavity 5.

On the basis of the first embodiment, the utility model discloses still have following embodiment:

example two

The liquid sinking cavity 5 is provided with a short section or a tail pipe, both ends of the short section or the tail pipe are provided with threads, and both ends of the short section or the tail pipe are respectively connected with the valve body of the offset fixed valve 4 and the plug 6. When the oil well pump is at the bottom dead center, the plunger 3 connected with the sucker rod string 1 can enter the liquid sinking cavity 5 and contact with the liquid in the liquid sinking cavity 5. Therefore, the gas originally remained between the lower moving valve and the fixed valve of the conventional oil well pump is completely eliminated in the descending process of the plunger 3 in the oil well pump, and is discharged into an oil pipe from the pump cylinder 2 together through the mixing of the upstream moving valve and the downstream moving valve in the plunger 3 and the liquid. Meanwhile, the gas is expanded, so that well fluid can be discharged quickly, the lifting of an oil well is assisted, and the purpose of oil-gas mixed pumping is achieved.

EXAMPLE III

The liquid inlet hole 44 is arranged in the hole wall of the central hole of the offset fixed valve 4, and the distance from the liquid inlet hole 44 to the top of the liquid inlet channel 41 is greater than the radius of the fixed valve ball 42, so that liquid flow entering the oil well pump is smooth.

Example four

The inner wall of the valve body of the bias fixing valve 4 is provided with a sealing ring 43, and the sealing ring 43 is arranged at the upper part of the liquid inlet channel 41.

EXAMPLE five

The inner diameter of the short section or the tail pipe is larger than the outer diameter of the plunger 3.

EXAMPLE six

The length of the short section or the tail pipe is larger than the total length of the plunger 3 and the upstream dynamic valve and the downstream dynamic valve which are connected at two ends.

EXAMPLE seven

The lower end of the liquid inlet channel 41 can be connected with an anti-fouling pipe 7, the lower end of the anti-fouling pipe 7 is closed, and dirt blocking holes or dirt blocking grooves are uniformly distributed in the pipe wall, so that the condition that liquid supply is met, and meanwhile, dirt in a shaft is prevented from entering the pump barrel 2 to cause pump leakage is avoided.

Example eight

The aperture of the dirt blocking hole or the groove width of the dirt blocking groove in the pipe wall of the anti-fouling pipe 7 is smaller than the size of dirt in the used oil well fluid.

The pump barrel 2 of the utility model is connected with the lower end of the oil pipe column and is put into the well through the oil pipe coupling; the utility model discloses a plunger 3 is connected by sucker rod 1 and is gone into in the pump barrel 2 down.

The embodiments described above are merely exemplary embodiments, but the present invention is not limited to these embodiments, and those skilled in the art can make modifications without departing from the spirit and teaching of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and modifications can be made, and equivalents can be substituted for elements thereof. Any modification, equivalent replacement, improvement and the like made within the spirit and the concept of the present invention should be included in the protection scope of the present invention. The scope of protection is therefore not limited to the description above.

Claims (8)

1. The oil-gas mixed oil well pump is characterized in that a bias fixing valve is connected to the lower end of the pump cylinder, the bias fixing valve is provided with a liquid inlet channel, a fixed valve ball and a liquid inlet hole, the fixed valve ball is installed between the liquid inlet channel and the liquid inlet hole, the liquid inlet channel and the fixed valve ball are biased to one side of a center hole of the bias fixing valve, a liquid sinking cavity is arranged below the bias fixing valve, and when the oil-gas mixed oil well pump is located at a bottom dead point, the plunger can enter the liquid sinking cavity.

2. The oil-gas mixed-discharge oil well pump as claimed in claim 1, wherein the fluid sinking chamber is provided with a nipple or a tail pipe, both ends of the nipple or the tail pipe are provided with threads, and both ends of the nipple or the tail pipe are respectively connected with the valve body and the plug of the offset fixed valve.

3. The oil-gas mixed oil-well pump of claim 1, wherein the liquid inlet hole is formed in the hole wall of the central hole of the offset fixed valve, and the distance from the liquid inlet hole to the top of the liquid inlet channel is greater than the radius of the fixed valve ball.

4. The oil-gas mixed-discharge oil-well pump as claimed in claim 1, wherein the inner wall of the valve body of the offset standing valve is provided with a sealing ring, and the sealing ring is arranged at the upper part of the liquid inlet channel.

5. The oil-gas mixing and discharging oil well pump as claimed in claim 2, wherein the inner diameter of the short section or tail pipe below the offset fixing valve is larger than the outer diameter of the plunger.

6. The oil-gas mixing and discharging oil well pump as claimed in claim 2 or 5, wherein the length of the short section or the tail pipe is larger than the total length of the plunger and the upstream dynamic valve and the downstream dynamic valve which are connected at two ends.

7. The oil-gas mixed oil-well pump of claim 1, 3 or 4, wherein the lower end of the liquid inlet channel is connected with an anti-fouling pipe, the lower end of the anti-fouling pipe is closed, and the wall of the pipe is uniformly distributed with anti-fouling holes or grooves.

8. The pump as claimed in claim 7, wherein the aperture of the dirt blocking hole or the width of the dirt blocking groove in the pipe wall of the anti-fouling pipe is smaller than the size of the dirt in the well fluid.

Images