CN206917636U - A precision piston type wellhead dosing device - Google Patents

Abstract

The utility model discloses a precise piston type wellhead chemical feeding device, which comprises a sealing shell, wherein a piston penetrates through the middle part of the sealing shell, the upper part of the top of the sealing shell is sleeved with a positioning sleeve, the positioning sleeve is wrapped outside the piston, a return spring sleeved on the piston is arranged inside the positioning sleeve, the upper part of the positioning sleeve is sleeved with an adjusting cap, and the top of the positioning sleeve is fixed with a positioning ring, the top of the buffer liquid cylinder is provided with a gland, the middle of the top of the gland is provided with a buffer anvil, the lower part of the sealing shell is sleeved with a connecting valve body, one end of the connecting valve body is provided with a valve cover, a ball valve pair is arranged in the valve cover, the bottom of the valve cover is provided with a medicine inlet joint, the other end of the connecting valve body is connected with a medicine outlet joint in a threaded manner, the bottom of the sealing shell is fixedly provided with a connecting seat, and the bottom of the connecting seat is fixedly provided with a connecting support. The utility model discloses sealed effectual, long service life, pollution abatement, oil well add medicine accurate, safe and reliable.

Description

A precision piston type wellhead dosing device

technical field

The utility model relates to the technical field of oil production tools in oil fields, in particular to a precision piston type wellhead dosing device.

Background technique

Generally, oil can be divided into heavy oil, heavily waxed high pour point oil, etc., which are difficult to exploit, and there are also oil wells with severe corrosion. Specifically, it is not uncommon for various reasons to cause frequent oil well operations to reduce crude oil production. The above-mentioned well conditions usually use different chemical agents to inject, which is currently the most simple and feasible process solution to reduce the difficulty of oil recovery; however, the use of trucks to add chemicals is not timely, resulting in high labor intensity for personnel and vehicles. Other processes all have inaccurate injection of medicaments, difficult operation, and potential safety hazards due to environmental pollution.

In order to overcome the above problems, the utility model provides a precision piston-type wellhead dosing device, which is suitable for the wellhead of oil wells. The wellhead device is installed at the wellhead. When the oil well is in production, the sucker rod In the reciprocating motion, the pressure plate on the sucker rod hits the buffer anvil in the wellhead continuous dosing device, so that the piston moves to inject the medicine into the well, and then the medicine can be continuously added to prevent wax deposition and viscosity reduction in the oil well.

Utility model content

The purpose of the utility model is to solve the shortcomings in the prior art, and propose a precision piston type wellhead dosing device.

In order to achieve the above object, the utility model adopts the following technical solutions:

A precision piston-type wellhead dosing device, comprising a sealed housing, a piston penetrates through the middle of the sealed housing, a positioning sleeve is sleeved on the upper part of the sealing housing, the positioning sleeve wraps the outside of the piston, and the positioning sleeve There is a return spring sleeved on the piston inside, the upper part of the positioning sleeve is sleeved with an adjusting cap, and the top of the positioning sleeve is fixed with a positioning ring, the positioning ring conflicts with the bottom surface of the adjusting cap, and the upper end of the piston A buffer cylinder is installed, and a booster spring is provided inside the buffer cylinder, and the lower end of the booster spring is against the upper end of the piston. A gland is installed on the top of the buffer cylinder, and a buffer anvil is installed in the middle of the top of the gland. , the lower part of the sealing shell is sleeved with a connecting valve body, a valve cover is provided at one end of the connecting valve body, a ball valve pair is arranged inside the valve cover, a drug inlet joint is installed at the bottom of the valve cover, and the other end of the connecting valve body One end is threadedly connected with a medicine outlet joint, the bottom of the sealed housing is fixed with a connecting seat, and the bottom of the connecting seat is fixed with a connecting pillar.

Preferably, a piston ring is sleeved around the lower portion of the piston, and the outer side of the piston ring is against the inner wall of the sealing housing.

Preferably, a first sealing ring is provided at the connection between the sealing housing and the connecting valve body.

Preferably, a second sealing ring is provided at the connection between the drug inlet joint and the valve cover and the connection between the drug outlet joint and the valve cover.

Preferably, a small hole is provided at the lower end of the buffer anvil.

Preferably, the piston ring is a stainless steel spring piston ring.

Compared with the prior art, the utility model has the beneficial effects of good sealing effect, long service life, reduced pollution, accurate dosing of oil wells, safety and reliability.

Description of drawings

Fig. 1 is the structural representation of a kind of precision piston type wellhead dosing device that the utility model proposes;

Fig. 2 is the structure schematic diagram of the buffer part in a kind of precision piston type wellhead dosing device proposed by the utility model;

Fig. 3 is a schematic structural view of a sealing case, a piston ring and a piston in a precision piston type wellhead dosing device proposed by the present invention;

Fig. 4 is a schematic diagram of installation of a precision piston type wellhead dosing device proposed by the utility model.

In the figure: 1 buffer anvil, 2. gland, 3 booster spring, 4 buffer fluid cylinder, 5 piston, 6 adjusting cap, 7 positioning ring, 8 return spring, 9 positioning sleeve, 10 sealing shell, 11 piston ring, 12 The first seal ring, 13 connection valve body, 14 valve cover, 15 ball valve pair, 16 second seal ring, 17 medicine inlet joint, 18 connection seat, 19 medicine outlet joint, 20 connection pillar.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example.

Referring to Figures 1-4, a precision piston type wellhead dosing device includes a sealed housing 10, a piston 5 runs through the middle of the sealed housing 10, and a positioning sleeve 9 is sleeved on the upper part of the sealing housing 10, and the positioning sleeve 9 Wrapped on the outside of the piston 5, the inside of the positioning sleeve 9 is provided with a return spring 8 sleeved on the piston 5, the upper part of the positioning sleeve 9 is sleeved with an adjusting cap 6, and the top of the positioning sleeve 9 is fixed with a positioning ring 7, and the positioning The ring 7 is in conflict with the bottom surface of the adjustment cap 6, the upper end of the piston 5 is equipped with a buffer fluid cylinder 4, the inside of the buffer fluid cylinder 4 is provided with a booster spring 3, and the lower end of the booster spring 3 is against the upper end of the piston 5, and the buffer fluid cylinder A gland 2 is installed on the top of the gland 2, a buffer anvil 1 is installed in the middle of the top of the gland 2, a connecting valve body 13 is sleeved on the lower part of the sealing shell 10, and a valve cover 14 is provided at one end of the connecting valve body 13, and the valve cover 14 A ball valve pair 15 is provided inside, a drug inlet joint 17 is installed at the bottom of the valve cover 14, a drug outlet joint 19 is threadedly connected to the other end of the valve body 13, and a connection seat 18 is fixed on the bottom of the sealed housing 10, and the connection seat 18 The bottom is fixed with connecting pillars 20.

In the utility model, the lower part of the piston 5 is circumferentially sleeved with a piston ring 11, and the outer side of the piston ring 11 is against the inner wall of the sealing housing 10, and the connection between the sealing housing 10 and the connecting valve body 13 is provided with a first A sealing ring 12, a second sealing ring 16 is provided at the connection between the medicine inlet joint 17 and the valve cover 14 and the medicine outlet joint 19 and the valve cover 14, the lower end of the buffer anvil 1 is provided with a small hole, and the piston ring 11 adopts a stainless steel spring piston ring.

In the present utility model, accompanying drawing 2 is the description of the buffer part: the booster spring 3 is installed in the buffer liquid cylinder 4, the bottom of the spring is the piston 5, the buffer anvil 1 is fixed on the top of the buffer liquid cylinder 4 by the gland 2, and the buffer anvil 1 is exposed Gland 2; a small hole is provided at the lower end of the buffer anvil 1, and the buffer fluid cylinder 4 is filled with hydraulic oil to seal the connection with the piston 5. When the pressure is applied, the damping effect generated when the liquid flows through the small hole is assisted by a spring to reduce The gravity of the sucker rod impacts on the device and compensates for the stroke loss of the plunger to improve the accuracy of the injection amount of the chemical.

In the present utility model, accompanying drawing 3 is the description of the sealed housing 10, piston ring 11 and piston 5: the piston ring 11 at the lower end of the piston 5 adopts a stainless steel spring piston ring, so that there is no medicament leakage during the reciprocating pumping and rowing motion of the piston , to ensure that the dosage of the agent is more accurate and to improve the corrosion resistance and prolong the service life of the whole machine.

When the utility model is in use, the power of the dosing machine comes from the downward gravity of the pumping unit. When the polished rod goes down, the pressure plate fixed on the polished rod pushes the dosing pump piston, compresses the medicine in the sealed casing 10, and injects the medicine into the oil well. ; When the pumping unit goes up, the return spring 8 pushes the piston 5 to go up and reset while completing the suction of the medicament. In order to make the dose of medicine injected into the wellhead by the dosing machine accurate, a small hole is provided at the lower end of the buffer anvil 1, and the buffer cylinder 4 is filled with hydraulic oil and connected with the piston 5 in a sealed manner. Effect, the spring is assisted to reduce the impact of the gravity of the sucker rod on the device and compensate the stroke loss of the plunger to improve the accuracy of the injection amount of the chemical.

The above is only a preferred embodiment of the utility model, but the scope of protection of the utility model is not limited thereto. The equivalent replacement or change of the new technical solution and the concept of the utility model shall be covered by the protection scope of the utility model.

Claims (6)

1. A precision piston-type wellhead dosing device, comprising a sealed housing (10), characterized in that a piston (5) runs through the middle of the sealed housing (10), and the sealed housing (10) The upper part of the top is sleeved with a positioning sleeve (9), which wraps the outside of the piston (5), and the inside of the positioning sleeve (9) is provided with a return spring (8) sleeved on the piston (5). The upper part of the positioning sleeve (9) is sleeved with an adjusting cap (6), and the top of the positioning sleeve (9) is fixed with a positioning ring (7), and the positioning ring (7) is in conflict with the bottom surface of the adjusting cap (6). The upper end of the piston (5) is equipped with a buffer fluid cylinder (4), and the interior of the buffer fluid cylinder (4) is provided with a booster spring (3), and the lower end of the booster spring (3) is against the upper end of the piston (5), so A gland (2) is installed on the top of the buffer fluid cylinder (4), a buffer anvil (1) is installed in the middle of the top of the gland (2), and a connecting valve is sleeved on the lower part of the sealing shell (10) body (13), the end of the connecting valve body (13) is provided with a valve cover (14), the valve cover (14) is provided with a ball valve pair (15), and the bottom of the valve cover (14) is installed with a drug inlet joint ( 17), the other end of the connecting valve body (13) is threadedly connected with a drug outlet joint (19), the bottom of the sealed housing (10) is fixed with a connecting seat (18), and the bottom of the connecting seat (18) is fixed There are connecting struts (20). 2. A precision piston-type wellhead dosing device according to claim 1, characterized in that a piston ring (11) is sleeved around the lower part of the piston (5), and the outer side of the piston ring (11) against the inner wall of the sealed housing (10). 3. A precision piston-type wellhead dosing device according to claim 1, characterized in that, the connection between the sealing housing (10) and the connecting valve body (13) is provided with a first sealing ring (12 ). 4. A precision piston type wellhead dosing device according to claim 1, characterized in that, the medicine inlet joint (17) and the valve cover (14) and the medicine outlet joint (19) and the valve cover (14) A second sealing ring (16) is provided at the connection. 5. A precision piston type wellhead dosing device according to claim 1, characterized in that a small hole is provided at the lower end of the buffer anvil (1). 6. A precision piston type wellhead dosing device according to claim 1, characterized in that the piston ring (11) is a stainless steel spring piston ring.