CN210152992U - Circulating pump cavitation prevention device for circulating heating of heavy oil well - Google Patents

Abstract

A circulating pump anti-cavitation device for circulation heating of a heavy oil well is characterized in that an outlet joint is arranged at the outlet end of a circulating pump, the outer end of the outlet joint is sequentially connected with a needle valve, a tee joint and a drain pipe, the outer end of the drain pipe is inserted into a water replenishing tank from the upper part of the water replenishing tank, the upper end of a water return pipe is communicated with the lower part of the water replenishing tank, the lower end of the water return pipe is connected to the outlet end of the circulating pump, an electromagnetic valve is arranged on a side opening of the tee joint, the needle valve can be opened normally in a small opening degree, a small strand of water drainage is always ensured, the discharged water flows to the water replenishing tank and is supplied to the circulating pump through the water return pipe, the circulating pump has a certain water inflow under the condition of low wellhead back pressure, the cavitation caused by insufficient water inflow pressure of the circulating pump can be prevented, the mechanical sealing damage on the circulating pump and the, the gas and electric heating device of the thickened oil well can be ensured to work normally, so that the thickened oil well can produce normally.

Description

Circulating pump cavitation prevention device for circulating heating of heavy oil well

Technical Field

The utility model discloses a viscous system's corollary equipment is fallen in heating of oil field viscous crude is a viscous crude circulation is anti-cavitation device of circulating pump for the heating.

Background

The oil field has many thick oil wells and wax deposition well, these thick oils are all taken out by the oil-well pump (including having the pole pump and no pole pump), because the mobility of thick oil is poor, flow resistance is big, the pressure differential between well head and the oil-well pump is big, cause the discharge pressure of oil-well pump high, the load of pumping unit is big, the energy consumption is high, the oil well output is low, power consumption is big, economic benefits is poor, when the viscosity of thick oil is too high, still can cause the oil flow passageway to be blockked up, in order to solve these problems that appear in the thick oil exploitation, need heat the viscidity that falls to thick oil on the pump, increase mobility, reduce flow resistance. In these heavy oil wells and wax-deposition wells, the heavy oil wells are heated by the gas and electric heater to thin and prevent wax deposition. Circulation pumps are used in such devices. The circulating pump is a centrifugal pump, and years of application summarization show that the pressure of return water in the circulating system at a wellhead is low, the suction pressure of the circulating pump is low, cavitation is easily generated, and the circulating pump and mechanical seals on the circulating pump are damaged. A circulating system in a heavy oil well gas and electric heating device needs to be matched with an expansion water tank, and water flow through the expansion water tank is intermittent and is easy to freeze in winter. The two problems of the thick oil well gas and the electric heating device in use can cause the thick oil well gas and the electric heating device to be incapable of working normally.

Disclosure of Invention

The utility model aims at designing a thick oil well circulation is anti-cavitation device of circulating pump for heating, overcomes the problem that the above-mentioned exists, makes thick oil well gas, electric heater unit ability normal work.

The purpose of the utility model is realized like this: the water supply device comprises an outlet joint, a needle valve, an electromagnetic valve, a tee joint, a drain pipe, a water replenishing tank, a circulating pump and a water return pipe, wherein the outlet joint is installed at the outlet end of the circulating pump, the outer end of the outlet joint is sequentially connected with the needle valve, the tee joint and the drain pipe, the outer end of the drain pipe is inserted into the water replenishing tank from the upper part of the water replenishing tank, the upper end of the water return pipe is communicated with the lower part of the water replenishing tank, the lower end of the water return pipe is connected to the outlet end of.

The utility model has the advantages that: the needle valve can the minor opening normally open, guarantees a little burst of drainage throughout, and the exhaust water flow is to the moisturizing case, and the circulating pump is supplied to the rethread wet return, makes under the condition that well head back pressure is low, and the circulating pump has certain inflow, can prevent that the circulating pump from because of the cavitation that intake pressure produced inadequately, can prevent that the mechanical seal on circulating pump and the circulating pump from damaging, because can guarantee a little burst of drainage throughout and circulate in the moisturizing case, rivers are continuous, also can not freeze in the moisturizing case in winter, consequently, the utility model discloses can solve viscous crude well gas, the problem that exists in the circulation system among the electric heater unit, guarantee to become viscous crude well gas, electric heater unit can normally work, makes viscous crude well can normally produce.

Drawings

Fig. 1 is an assembly view of the present invention.

Detailed Description

An embodiment of the present invention will be described below with reference to fig. 1.

As shown in fig. 1, the embodiment of the utility model discloses an including outlet connection 1, needle valve 2, solenoid valve 3, tee bend 4, drain pipe 5, moisturizing case 6, circulating pump 7, wet return 8, outlet connection 1 installs the exit end at circulating pump 7, needle valve 2 is connected gradually to outlet connection 1's outer end, tee bend 4, drain pipe 5, insert in moisturizing case 6 from moisturizing case 6's upper portion in drain pipe 5's the outer end, the upper end of wet return 8 and moisturizing case 6's lower part switch-on, the lower extreme of wet return 8 is connected to circulating pump 7's exit end, install solenoid valve 3 on tee bend 4's side mouth.

When the heavy oil well gas and electric heating device works, the needle valve 2 is in a small-opening normally-open state, a small strand of water is always discharged, the discharged water flows to the water replenishing tank 6, the circulating pump 7 is replenished through the water return pipe 8, and the circulating pump 7 has certain water inflow under the conditions of low wellhead back pressure and insufficient water supply.

The electromagnetic valve 3 is installed on the side opening of the tee joint 4, the electromagnetic valve 3 is associated with the start and stop of the circulating pump 7, the electromagnetic valve 3 is in a closed state when the circulating pump 7 is started, and when the circulating pump 7 is stopped and the ambient temperature is lower than or equal to 0 ℃, the electromagnetic valve 3 is in an open state, water in the water drainage pipe 5 can be emptied, and the water drainage pipe 5 is prevented from being frozen and blocked.

Claims (1)

1. The utility model provides a viscous crude well circulation heating is with circulating pump anti-cavitation device, includes outlet joint (1), needle valve (2), solenoid valve (3), tee bend (4), drain pipe (5), moisturizing case (6), circulating pump (7), wet return (8), characterized by: the outlet end at circulating pump (7) is installed in outlet joint (1), needle valve (2), tee bend (4), drain pipe (5) are connected gradually to the outer end of outlet joint (1), insert in moisturizing case (6) from the upper portion of moisturizing case (6) in the outer end of drain pipe (5), the upper end of wet return (8) and the lower part switch-on of moisturizing case (6), the lower extreme of wet return (8) is connected to the exit end of circulating pump (7), install solenoid valve (3) on the side mouth of tee bend (4).

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