Hollow stem water-mixed wellhead device

Abstract

The invention relates to a hollow bar water adding wellhead device. The screw threads on the upper part of a sealed pipe is connected with small screw threads in a pressure relief adapter, big screw threads in the pressure relief adapter are connected with a water adding T-piece, the water adding T-piece is connected with an oil outlet T-piece, the oil outlet T-piece is connected with a flange cover through upper and lower clips, and the flange cover is connected with a wellhead cross joint through bolts. A pressure separation pump barrel is connected with the internal screw threads of the water adding T-piece, a suspension sealed joint is suspended in the wellhead cross joint, and the lower part of the suspension sealed joint is connected with a oil pumping pipe. A polished rod passes through the sealed pipe, the lower part of the polished rod is connected with a link joint, and the lower part of the link joint is connected with a pressure separation plunger which is arranged inside the pressure separation pump barrel. A pressure relief hole is arranged on the pressure relief adapter, a water adding port is arranged on the water adding T-piece, an oil outlet port is arranged on the oil outlet T-piece, a water adding passage is arranged between the sealed pipe and the pressure separation pump barrel, an oil outlet passage is arranged between the oil pumping pipe and the pressure separation pump barrel, and a link hole is communicated with the internal part of the pressure separation plunger. The device does not need a high pressure hose, and has resistance to high temperature and high pressure. The device which is suitable for addition of steam has long service life, long-period normal production of a pumping well, and good economic benefit.

Description

1. Technical field [0001] The invention is a device for oil recovery in an oil field, which is a hollow rod water-mixed wellhead device. 2. Background technology [0002] In heavy oil wells and wax wells, some use hollow rods to pump oil by mixing water to reduce viscosity and remove wax. The principle of hollow rod water mixing is that heated water or steam enters the hollow rod from the wellhead high-pressure hose and mixes with the crude oil on the pump to heat and dilute the crude oil, so as to achieve the purpose of reducing viscosity and removing wax, so that the oil well can be produced normally. The high-pressure hose heating is to fix one end of the high-pressure hose on the ground, and connect the other end with the upper end of the moving hollow polished rod, so that the heated water or steam wellhead high-pressure hose enters the hollow rod. However, the high-pressure hose has poor heat resistance and is not suitable for heating by steam; the high-pressure hose ...

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Problems solved by technology

However, the high-pressure hose has poor heat resistance and is not suitable for heating by steam; the high-pressure hose has to be retracted and retracted with the rotation of the donkey head of the pumping unit, and the service life of the high-pressure hose is short; the destruction of

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