SU724698A1 - Pumping unit for obtaining oil from well - Google Patents

Description

The invention relates to the field of the oil industry, and in particular to devices for feeding and dosing various reagents to the downhole equipment.

Known pumping unit for oil production from wells, including a reagent dispenser and a sucker rod pump. The reagent is fed to the dispenser through a feed tube parallel to the rod string, and the dispenser, which works from the differential pressure that occurs during the operation of the rod pump, delivers the reagent to the reception.

The disadvantages of this installation are the presence of a feeding tube that interferes with hoisting operations; the unreliability of the metering device due to the small pressure drop; the inability to control the volume of injection of the reagent.

Also known is a deep pump installation for oil production and downhole processing, including a rod string, a container with a reagent, its dispenser and a feeding tube connecting them, a sucker rod pump containing a cylinder with a plunger, suction and discharge valves! [2].

The presence of a container with a reagent complicates the hoisting operations and requires the lifting of the entire unit for refueling, which is uneconomical. The reagent supply is adjusted by changing the hydraulic resistance of the valve assembly. Since the principle of operation is based on the 5th absorption of the reagent into the cylinder cavity during pump operation, the forces arising from this suction are small and in the case of insufficiently clean reagent, its injection will not occur.

The aim of the invention is to increase the reliability of the device, improve accuracy and expand the dosage range, providing replenishment of the reagent without lifting equipment.

This goal is achieved by the fact that the metering plunger is connected to the plunger of the sucker rod pump, and the pump cylinder with the rod string, the latter being hollow for supplying reagent and a valve assembly of the plunger pump is installed in them.

The drawing shows a diagram of a pumping unit.

The pump installation consists of a cylinder 25 1 of a rod pump, in which a plunger 2 of a rod pump with a discharge valve 3 and a suction valve 4 is placed. The plunger 2 of the rod pump is connected to a needle plunger 7 by means of a connecting rod 5 and coupling 30, 6

C y /. '8 / placed in cylinder 8 of the metering pump. The cylinder 8 is attached to the column of hollow rods 9, in which the valve assembly of the metering pump is located, consisting of the discharge and suction valves 10 and I. The cylinder 1 of the rod pump through the adapter 12 is connected to the column 13 of the tubing. To adjust the stroke of the metering pump, an adjusting ring 14 is placed on the connecting rod 5.

The pump installation operates as follows.

After the descent of the pump unit into the well, the column of hollow rods 9 is filled with reagent. Then alternating forces are applied to it, forcing the column of hollow rods to make reciprocating movements.

When the plunger 2 of the sucker rod pump moves up, the plunger 7 of the metering device tends to its lowest position - the reagent is fed through the suction valve 11 into the dispenser cylinder 8, when the plunger 2 of the sucker pump moves down due to the friction of the plunger 2 against the cylinder wall 1 and losses in the discharge, valve 3, the plunger 7 tends to its highest position, displacing the reagent from the cylinder 8 through the discharge valve 10 of the dispenser and the produced fluid.

The application of the invention allows the supply of reagent into the well with high accuracy. Since the metering pump develops great efforts during operation (the result of the difference in the cross section between the needle plunger and the plunger of the sucker rod pump), it is not afraid of possible clogging of the passage channels, and the possibility of changing the stroke length of its plunger allows you to adjust the amount of reagent supply. With a more accurate supply of the estimated amount of the expensive reagent, it does not overspended and the technological equipment operates in the optimal mode.

The use of hollow rods for supplying reagent from the wellhead reduces the number of tripping operations by about 10 times.

All this as a whole increases the reliability of the entire deep well pumping unit.

Claims (2)

Claim A pumping unit for oil production from a well, including a sucker rod pump containing a cylinder with a plunger, suction and discharge valves, a rod string, a reagent dispenser, made in the form of a plunger pump with a valve assembly, characterized in that, in order to increase the reliability of work, increase accuracy and expansion of the dispensing range, ensuring reagent replenishment without lifting equipment, the metering plunger 10 is connected to the plunger of the rod pump, and the pump cylinder with the column of rods, the latter being hollow for supplying reagent and in them the valve assembly of the plunger pump is installed. 15 Sources of information taken into account in the examination 1. USSR Copyright Certificate No. 444872, cl. E 21B 43/00, 1963. 2. USSR copyright certificate 20 No. 351997, cl. E 21B 43/00, 1968.