SU1384827A1 - Sucker-rod well pump unit - Google Patents

Description

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Yu

The invention relates to the technique of obium oil, in particular to well sucker-rod installations, and can be used in the oil and gas industry when pumping formation fluids with a high gas actor.

The purpose of the invention is to increase the productivity and operational reliability

Fig. 1 is a schematic representation of the proposed well pumping unit; Fig 2 - wellhead gland assembly

The well pumping unit includes a pump 1, the plunger 2 of which is connected to the column of pump rods 3 and is installed in the cylinder 4, a column of pump tubes 5 installed in the cavity 6 of the annular space of the well 7, the mouth seal 8 with the pipe 9 installed in it a controlled check valve 11 and polished rod 12 passing through the cavity of the wellhead epiploon 8 The tube 10 is installed with the possibility of communicating cavities 9 and 6 respectively of the wellhead epiploon 8 and the annulus of the well 7, and m nnom polished rod 12 is mounted an element 13 provided with a sheath 14 made of a material in the form of a permanent magnet wellhead stuffing box 8 also has a check valve 15.

A borehole sucker pump unit operates as follows.

After completing the stroke of the pumping column ttang 3 with plunger 2 of pump 1 up, the polished rod 12 begins to move downwards. As the balance head of the pumping unit moves down (not shown), polished rod 12, the column of pump rods 3 and plunger 2 of pump 1 also move downwards. At the same time, the column of pump rods 3, freed from static loads, the weight of the liquid column in the column of pump tubes 5 above the plunger 2, the frictional forces and dynamic forces, is shortened, and the column of pump tubes 5, on the contrary, lengthens on myself. As a result, the fluid level in the column of pump tubes 5 drops slightlyg as the volume of their internal cavities increases from the elastic elongation of the tubes, where it moves

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the fluid and the check valve 15 of the wellhead seal 8 is closed. The fluid column (not shown) above the plunger 2 also moves downwards. When the plunger 2 reaches the lower dead center, it instantly stops, and the fluid column by inertia tends to continue downward under the action of dynamic forces in the fluid, and Also, the impact of hydraulic shock caused by the sudden stop of the plunger 2, the liquid is compressed, as it contains dissolved gas and reduces its volume in the column of pumping tubes 5 o This leads to some liquid level and volume release in the column of pumping pipes and, as a result, pressure drop in the pipes B, this moment the shell 14 in the form of a permanent magnet, which is equipped with the element 13 of polished rod 12, is opposite the check valve 11 and, overcoming the force its spring (not shown), attracts the rod (not shown), thereby opening the check valve 11. The cavity 6 of the space of the well 7 is thus communicated with the cavity 9 of the wellhead seal 8 through the tube 10

Since at this moment the gas pressure released from the liquid in the cavity 6 of the annulus of the well 7 is significantly greater than the pressure in the column of pump tubes 5 (in its upper part, where the level drops), the gas rapidly flows there,

When the balancer head moves upwards, the column of the pump rods 3 and the polished rod 1 2 and the pump 2 plunger 2 connected with it move up, while the liquid pumped out by the pump also rises up the column of pump tubes 5, the pressure in the cavity 9 of the wellhead epiploon 8 grows and the check valve 15 opens. The liquid rising along the column of pumping pipes compresses the gas above it and forces it out through the open valve with the check valve 15 and the discharge line (not shown). In this case, the spring returns the valve of the check valve 11 to the initial position, behind its cover

After the rocking head of the rocker head has been turned up, the polished boot 12 moves down and the cycle of the pump unit is repeated.

Claims (1)

Invention Formula A borehole pumping unit containing a pump, the plunger of which is connected to the column of pump rods and installed in the cylinder, a column of pumping pipes installed in the cavity of the annulus of the well, the mouth gland, the cavity of which is provided with a tube with in it a controlled check valve and a polished rod extending through the cavity of the glands, characterized in that, in order to improve performance and operational reliability, the tube is installed with the ability to communicate the cavities of the wellhead and the annular space, and an element is installed on the polished rod; a shell made of a material in the form of a permanent magnet. (.Z