SU868119A1 - Plant for recovering oil - Google Patents

Description

(54) INSTALLATION FOR OIL PRODUCTION

one

The invention relates to the design of submersible pumping units used for oil production. It will find application for exploitation of oil wells with a subsea wellhead.

A well-known installation for the extraction of oil, comprising a sucker-rod pump, the polished rod of which is associated with a piston installed in a chamber, to which a pressurized fluid is supplied to raise the piston with the rod 1.

However, the installation cannot be used. It is called for operation of a well with an underwater location.

Also known is an installation for oil extraction, consisting of a submersible sucker rod pump, a polished rod, and a pump drive made in the form of a chamber with a piston connected to a polished rod, the piston space of which is connected via a two-position slide valve with a pressure source 2.

However, under the conditions of the underwater location, the mouth of the installation will not find application, since it requires a high pressure of the hydraulic actuator, and the process of the underground is complicated.

repair, as the rail installation must be moved away from the wellhead.

The aim of the invention is to provide oil production from a well with a subsea wellhead.

This goal is achieved by the fact that the camera is installed in guide posts with limiters, rigidly connected with the piston and divided by a diaphragm, over which a hole is made in the chamber.

The piston is hollow and the source of pressure is compressed gas.

FIG. 1 shows an installation for oil production in a lower position; in fig. 2- installation with the upper placement of the piston.

The proposed installation consists of a guide mast consisting of four guide posts 1 with guide funnels 2 at the lower ends, as well as upper 3 and lower 4 upstream and downstream travel stop 5, chamber 6 rigidly connected to the piston 5 and associated with a source of compressed gas, such as a balloon 7, the pressure in which exceeds the hydrostatic pressure of sea water at the lower piston limiter and with the atmosphere by means of a hose 8 through a two-position

9 spool; wellhead gland 10, which serves to seal the mouth and flow line 11, polished rod 12, designed to connect the column of rods to the float 5, the rod 13, located on the upper limiter and serves for lifting and lowering the installation.

The installation and operation of the installation are carried out as follows.

After the submersible pump is lowered into the well, the last shaft is connected to the polished brush 12 and, passing it through the installation mouth gland 10, is connected to a piston that is made of cores and is a float 5. In a known way along the guide wire; descends and mounts at the wellhead.

The wellhead gland 10 is connected to the wellhead and the flow line with the pipeline, depending on the depth of the sea, using a diver or remotely using known connectors.

After installation, the float is in its lowest position. In order to set the installation in motion, the chamber 6 through the hose 8 by means of the on-off valve 9 communicates with a compressed gas cylinder 7, the pressure of which exceeds the hydrostatic pressure of the water of the lower limiter. At the same time, the gas under pressure that exceeds the hydrostatic pressure of water in the chamber cavity fills the chamber of the piston-float 5 and displaces water from it, thus increasing the lifting force of the piston-float 5, giving it positive buoyancy. As a result, the piston 5 rises up and there is no column of rods, the pump plunger and the liquid above it.

When the upper limiter 3 is reached, the piston stops and at this time the valve 9 is actuated connecting the chamber to the atmosphere. The gas in the chamber is released into the atmosphere, causing the chamber to be filled with water, which leads to an increase in the weight of the float, which becomes negative buoyancy and drops down to the lower limiter 4, thus completing one cycle of pumping liquid.

The distance between the limiters, which determines the stroke of the plunger, the constant volume of the piston-float, the change in the volume of the chamber and the frequency of change are determined on the basis of the characteristics and parameters of a particular well.

Claims (2)

1. An oil recovery unit consisting of a submersible sucker-rod pump, a polished rod and a pump drive made in the form of a chamber with a piston connected to a polished rod, the piston space of which is connected via a two-position slide valve with a pressure source, characterized in that In order to provide oil production from a well with an underwater location, the chamber is installed in guide posts with limiters, rigidly connected to the piston and separated by a diaphragm, over which a hole is made in the chamber. 2. The installation as claimed in claim 1, wherein the piston is hollow and the pressure source is compressed gas. Sources of information taken into account in the examination 1. USSR author's certificate number 69431 cl. F 04 B 47/04, 1947. 2. USSR author's certificate No. 652347, cl. F 04 B 47/00, 1977 (prototype).