CN214196273U

CN214196273U - Concentric double-tube hydraulic jet pump with novel combined sealing structure

Info

Publication number: CN214196273U
Application number: CN202023056411.2U
Authority: CN
Inventors: 张树华; 刘振浩; 王雷雷
Original assignee: Shengli Oilfield Longdi Petroleum Technology Equipment Co ltd
Current assignee: Shengli Oilfield Longdi Petroleum Technology Equipment Co ltd
Priority date: 2020-12-18
Filing date: 2020-12-18
Publication date: 2021-09-14
Anticipated expiration: 2030-12-18

Abstract

The utility model provides a concentric double-barrelled water conservancy jet pump with novel combination seal structure belongs to a water conservancy jet pump for oil field oil recovery, and it has the pump barrel, the position external diameter that cup joints on pump core upper portion and the pump barrel big-end-up, the reducing position forms first conical surface, has second conical surface for the position of first conical surface on the boss, has the metal material ring of horn mouth shape between two conical surfaces, has sealed material ring between pump core outer wall and the pump barrel inner wall of metal material ring below. The injection pump is reasonable in structure, forms a combined sealing structure, greatly reduces the length of a sleeving gap between a pump core and a pump barrel of the injection pump, and avoids foreign matter filling by adopting a conical surface matching mode. The metal material ring can be made of anti-scaling materials, scaling between the pump core and the pump barrel is avoided, and therefore production cost is reduced.

Description

Concentric double-tube hydraulic jet pump with novel combined sealing structure

Technical Field

The utility model relates to a hydraulic jet pump for oil recovery in oil field, especially a concentric double-barrelled hydraulic jet pump of modified.

Background

The concentric double-pipe hydraulic jet pump has wide application range in the crude oil extraction process. The pump is driven to work by taking high-pressure water as power fluid, and the purpose of lifting the liquid in the shaft is achieved by energy conversion between the power fluid and the formation fluid. The high-pressure power liquid flows downwards along a power liquid pipe column through a wellhead to enter the underground jet pump, when the power liquid passes through a nozzle of the underground pump, the energy of the power liquid is converted into kinetic energy by pressure energy, the pressure is rapidly reduced, a relatively low-pressure area is formed around the nozzle, the formation liquid enters the pump through a tail pipe under the action of the pressure of the ground layer and flows to the relatively low-pressure area, the formation liquid is mixed with high-speed jet liquid at the outlet of the nozzle and then enters a throat pipe, mixed liquid is formed in the throat pipe, the formation liquid obtains sufficient energy from the power liquid and is gradually pressurized, namely, the liquid mixed with the power liquid and the formation liquid at the throat pipe is converted into the pressure energy by the kinetic energy, the pressure energy tends to be consistent at the boundary of a diffusion pipe, and the mixed liquid is lifted to the ground along the pipe column. At present, when the jet pump is produced, a sealing material ring at the sleeving part of the pump core and the upper part of a pump cylinder is utilized to seal and separate an upper cavity and a lower cavity, the upper part of the sealing material ring is high-pressure power liquid, the lower part of the sealing material ring is relatively low-pressure stratum liquid, the gap between the sealing material ring and the pump cylinder is very small, the sealing pressure is high, when foreign matters in an inner oil pipe are filled into the gap or scales are formed in the gap, the problem that the separation of the pump core and the pump cylinder of the jet pump is difficult is easily caused, the pump core is difficult to lift out, the operation is required to lift out the pump core, the production cost is increased, the normal production of oil extraction is influenced, and the utilization rate of an oil well is low.

Disclosure of Invention

The utility model aims to solve the technical problem that a concentric double-barrelled water jet pump with novel combined seal structure is provided to effectively solve between pump core and the pump barrel because of the problem of injection pump core and the pump barrel separation difficulty that foreign matter packing or scale deposit caused.

The utility model discloses a realize like this, a concentric double-barrelled water jet pump with novel combination seal structure, it has the pump barrel, has the pump core in the pump barrel, and the pump barrel lower extreme is fixed with the tail pipe, has the standing valve in the tail pipe, the position external diameter that cup joints on pump core upper portion and the pump barrel big-end-up, the reducing position forms first conical surface, and cup joint the pump barrel inboard at position has the boss of inside extension, has second conical surface for the position of first conical surface on the boss, has the metal material ring of horn mouth shape between two conical surfaces, has sealed material ring between pump core outer wall and the pump barrel inner wall of metal material ring below.

The concentric double-tube hydraulic jet pump is reasonable in structure, the metal material ring and the sealing material ring form a combined sealing structure, the length of a sleeving gap between a jet pump core and a pump cylinder is greatly reduced, and meanwhile, a conical surface matching mode is adopted, so that foreign matter filling is avoided. The metal material ring can be made of anti-scaling materials, scaling between the pump core and the pump cylinder is avoided, the pump core is easier to lift out from the pump cylinder, and therefore production cost is reduced.

Drawings

Fig. 1 is a schematic view of a conventional concentric double tube hydrajet pump configuration.

Fig. 2 is a partially enlarged view a of fig. 1.

Fig. 3 is a schematic view of the structure of the concentric double-tube hydraulic jet pump of the present invention.

Fig. 4 is a partially enlarged view B of fig. 3.

In the figure: 1. an inner oil pipe; 2. an outer oil pipe; 3. a pump core; 31. a first tapered surface; 4. a pump barrel; 41. a boss; 42. a second tapered surface; 5. a fixed valve; 6. a tail pipe; 7. a ring of metallic material; 8. sealing material ring, 9, sealing ring.

Detailed Description

The following embodiment is provided in conjunction with the accompanying drawings to further illustrate the specific structure of the present invention.

As shown in the attached drawing, the utility model relates to a concentric double-barrelled water jet pump with novel combination seal structure, it has pump barrel 4, has pump core 3 in the pump barrel, and the pump barrel lower extreme is fixed with tail pipe 6, has standing valve 5 in the tail pipe, the position external diameter that cup joints on pump core upper portion and the pump barrel big-end-up, the reducing position forms first conical surface 31, and cup joints the pump barrel inboard at position and have the boss 41 of inside extension, there is second conical surface 42 for the position of first conical surface on the boss, has the metal material ring 7 of horn mouth shape between two conical surfaces, has sealing material ring 8 between pump core outer wall and the pump barrel inner wall of metal material ring below.

When the oil pump is used, the upper end of the outer part of the pump cylinder is fixed with the outer oil pipe 2, and the upper end of the inner part of the pump cylinder is fixed with the inner oil pipe 1.

Generally, the bell-mouth-shaped metal material ring can be formed by welding and fixing a high-temperature-resistant metal material on the first tapered surface 31 or the second tapered surface 42, and then machining. The bell-mouth-shaped metal material ring can be made of iron-based alloy, and can also be made of nickel-based, molybdenum-based, niobium-based and tungsten-based alloy, and the bell-mouth-shaped metal material ring has good mechanical property and chemical stability at high temperature. The Ni-based alloy is the most preferable, and the matrix in the structure is Ni-Cr-Co solid solution and Ni3Al metal compound.

As can be seen from the figure, the length of the sleeving part between the pump core and the pump barrel of the jet pump is far shorter than that of the existing jet pump, and the sealing matching length of the sealing material ring is far shorter than that of the original sealing matching length. When the jet pump works, the upper parts of the two sealing parts are high-pressure power liquid, the lower parts of the two sealing parts are opposite low-pressure stratum liquid, obvious pressure difference exists between the upper end and the lower end, the power liquid and the stratum liquid are sealed and separated by the metal material sealing surface under the action of pressure, and the sealing effect is better when the pressure is higher; and meanwhile, the sealing material ring below the metal material ring further increases the sealing reliability. The advantages of the combined sealing structure mainly include the following points: 1. the metal material ring is corrosion resistant and scaling resistant; 2. the upper part adopts a sealing structure with a conical surface, and foreign matters in the inner oil pipe cannot enter a sealing gap of the sealing material at the lower part; 3. because the existence of the sealing structure of the conical surface at the upper part, the upper part and the lower part of the sealing material ring at the lower part have almost no pressure difference, and the scaling probability can be greatly reduced.

The sealing material ring can adopt rubber sealing material.

As shown in fig. 1 and fig. 2, on the concentric double-barrelled hydraulic jet pump of current, the pump core is the structure of external diameter constant diameter, and the length of cup jointing the position between pump core and the pump barrel is far more than the utility model discloses, only one sealing ring 9, the length of sealing ring also is greater than far away the utility model provides a sealing material ring.

Except for the sealing structure, the other structures of the concentric double-tube jet pump and the working principle thereof are the same as the prior one, and are not detailed.

The above-mentioned embodiments are only one of the preferred embodiments of the present invention, and the general changes and substitutions performed by those skilled in the art within the technical scope of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a concentric double-barrelled water conservancy jet pump with novel combination seal structure, it has pump barrel (4), has pump core (3) in the pump barrel, and the pump barrel lower extreme is fixed with tail pipe (6), has standing valve (5) in the tail pipe, its characterized in that, the position external diameter that cup joints of pump core upper portion and pump barrel big-end-up, the reducing position forms first conical surface (31), and cup joints the pump barrel inboard at position and have boss (41) of inwards stretching out, there is second conical surface (42) for the position of first conical surface on the boss, has metal material ring (7) of horn mouth shape between the two conical surfaces, has between pump core outer wall and the pump barrel inner wall of metal material ring below sealed material ring (8).