RU2838688C1 - Well self-cleaning filter of insert pump - Google Patents

Abstract

FIELD: obtaining oil from wells.

SUBSTANCE: invention relates to oil industry, in particular to well filters for filtration of oil well products, and is intended for protection of inserted well sucker-rod pump against ingress of mechanical impurities. Device includes a pipe with perforations, which is interconnected in the upper part with the inlet of the pump lowered into the tubing string, and a lower plug in the form of a cone converging downwards. Elevator pipe string is equipped from below with branch pipe with upper inner stop and inner brushes installed uniformly along the perimeter. From below the cone is equipped with a spring centraliser for a tubing string and a branch pipe; an upper internal support of the branch pipe has a possibility of interaction with a pump. Perforated holes are made below internal brushes of the branch pipe with the possibility of interaction for cleaning with these brushes at movement up and down of the pipe with the pump relative to the branch pipe.

EFFECT: easy manufacture and reliable operation due to absence of internal movable elements.

1 cl, 1 dwg

Description

The invention relates to the oil producing industry, in particular to well filters for filtering oil well products, and is intended to protect a rod pump from mechanical impurities entering it.

A self-cleaning filter for a sucker rod pump is known (AUTHORITY SAFETY CU No. 1536049, IPC F04B 47/00, F04B 21/06, published 15.01.1990 Bulletin No. 2), located in a well on a column of pump pipes and consisting of a perforated tailpiece installed in the lower part of the casing and connected to it, as well as a cleaning device, wherein the cleaning device is made in the form of a spiral encircling the outer surface of the perforated tailpiece, the connection of the perforated tailpiece with the lower part of the casing is made in the form of a stop lantern, in the lower part of which the upper end of the spiral is fixed, and the lower end of the latter is provided with a ring installed with the possibility of axial movement relative to the perforated tailpiece, wherein the pitch of the spiral turn is less than the absolute value of the deformation of the column of pump pipes.

The disadvantages of this filter are its narrow scope of application due to the fact that it only works with sucker rod pumps, the complexity of lowering operations due to the need to simultaneously lower the lift pipes, the cleaning spring element with a ring and the pump on the rod column into the well, and the low quality of cleaning due to the impossibility of cleaning the filter from internal contamination with a spring with a ring.

The closest in technical essence is the filter of the inserted sucker rod pump (patent for PM. RU No. 208342, IPC E21B 43/08, published on 14.12.2021 Bulletin No. 35), including a pipe with perforation holes, equipped with a fastening to the pump in the upper part, and a plug at the bottom, wherein the plug is made in the form of a cone tapering from top to bottom, wherein the pipe below the perforation, but above the plug, is equipped with a branch pipe - a collector, the internal cavity of the pipe is equipped with rigidly fixed guides with upper and lower corresponding stops, between which at least one crossbar with an annular shell on the outside is inserted with the possibility of longitudinal movement in the perforation interval of the pipe along the guides, equipped along the outer perimeter with at least one blade and / or brush interacting with the inner surface of the pipe with the possibility of cleaning when moving along it, wherein At least one crossbar is equipped with a float, which ensures that the shell floats up in the well fluid.

The disadvantages of this filter are the complexity of the design due to the presence of a large number of parts, including moving ones, which reduces the reliability of the design, large time costs for cleaning the filter due to the need to raise it above the liquid level in the well to lower the float and low quality of cleaning, since cleaning is done from the inside, and most of the deposits accumulate on the outside.

The technical result is the creation of a simple and reliable design of a well self-cleaning filter of an insert pump, which allows, without internal moving elements, to clean the filter from the outside with its small longitudinal movement relative to the well.

The technical solution is a self-cleaning borehole filter of an insert pump, which includes a self-cleaning borehole filter of an insert pump, which includes a pipe with perforation holes, connected at the top to the inlet of the pump, lowered into the lift column of pipes, and a lower plug in the form of a cone, tapering from top to bottom.

What is new is that the elevator column of pipes is equipped at the bottom with a branch pipe with an upper internal stop and internal brushes installed evenly along the perimeter, the cone at the bottom is equipped with a spring centralizer for the elevator column of pipes and the branch pipe, the upper internal stop of the branch pipe is designed with the possibility of interaction with the pump, perforation holes are made below the internal brushes of the branch pipe with the possibility of interaction for cleaning with these brushes when moving the pipe with the pump up and down relative to the branch pipe.

The drawing shows a diagram of a well filter cleaning insert pump in a well.

The self-cleaning borehole filter of the insert pump 1 includes a pipe 2 with perforation holes 3 (shown conditionally), communicated in the upper part with the inlet of the pump 1 lowered into the elevator column of pipes 4, and a lower plug in the form of a cone 5, narrowing from top to bottom. Pump 1 can be used of any known design, for example, a sucker rod pump (SRP), an electric centrifugal pump (ECP), a gerotor pump (GP), etc. Perforation holes 3 can be made of any shape, for example, thin round holes, slits, holes with wire wound on the outside, etc. (the author does not claim this), not allowing large mechanical impurities to pass inside the pipe 2. The elevator column of pipes 4 is equipped at the bottom with a branch pipe 6 with an upper internal stop 7 and internal brushes 8 installed evenly along the perimeter. The stop 7 can be made in the form of a locking mechanism for the lower projection of the pump 1, since such design elements are known (including in GOST 31835-2021), the authors do not claim this. The cone 5 is equipped at the bottom with a spring centralizer 9 for the elevator column of pipes 4 and branch pipe 6. The perforation holes 3 are made when the pump 1 interacts with the internal stop 7 with the possibility of installing below the internal brushes 8 of the branch pipe 6 and interacting for cleaning with these brushes 8 when moving up and down the pipe 2 with the pump 1 relative to the branch pipe 6.

The well self-cleaning filter works as follows.

The branch pipe 6 is equipped from the inside with internal brushes 8 installed uniformly around the perimeter, and from the top from the inside with a stop 7, and is connected to a column of lift pipes 4, on which it is lowered into the well 9 into the interval of the productive formation 8. The pipe 2 with perforation holes 3, a cone 5 and a spring centralizer 9 is connected from below to the pump 1 so that the pipe 2 communicates with the inlet of the pump 1. After which the pump 1 is lowered into the well 9 on a rod 11. A column of rods (for a sucker rod pump) or an armored cable (for an electric centrifugal pump or a gas pump), etc. can be used as a rod 11. Pump 1 on rod 11 is lowered until pipe 2 passes through stop 7 and branch pipe 5 using spring centralizer 9 and cone 5 until pump 1 interacts with stop 7 and perforation holes 3 are positioned below internal brushes 8 of branch pipe 6. After which wellhead (not shown) 4 is sealed, rod 11 in the form of rods is connected to wellhead drive (pumping unit, chain drive, etc. - not shown) or rod 11 in the form of cable - to power unit and pump 1 is started up. In this case, production of formation 10 enters perforation holes 3 into pipe 2 to pump 1 inlet and then along column of elevator pipes 11 to surface.

During operation of pump 1, clogging of perforation holes 3 of pipe 2 occurs, which is characterized by an increase in energy consumption for lifting a unit of formation production 10 (kW/m ³ ). In practice, an increase in energy consumption by 10-20% serves as a signal for the need to clean perforation holes 3. To clean these holes 3, the wellhead 4 is depressurized and pump 1 with pipe 2 is lifted using rod 11 to a height of approximately 1-1.5 lengths of pipe 2, followed by lowering pump 1 to the stop 7. In this case, perforation holes 3 are cleaned from the outside by internal brushes 6 of branch pipe 5 during the up and down stroke, and spring centralizer 9 does not allow pipe 2 to deviate significantly from the axis of branch pipe 6, which maintains the integrity of internal brushes 8 for a long period. From practical tests it turned out that in 95% of cases one up-and-down pass is enough to clean these holes 3, which is characterized by a decrease in energy consumption for lifting a unit of production of the formation 10. After work on cleaning the perforation holes 3, the wellhead 4 is sealed and the pump 1 is put into operation.

As practice has shown, this filter, compared to the closest analogue, reduces the time spent on cleaning by 2-4 times depending on the liquid level in the well 4, and increases the time of trouble-free operation by an average of 4 times due to the absence of moving parts inside the pipe 2.

The proposed well self-cleaning filter of the insert pump is simple to manufacture and reliable in operation due to the absence of internal moving elements, which allows cleaning the filter from the outside with a small longitudinal movement relative to the well.

Claims (1)

A self-cleaning borehole filter for an insert pump, comprising a pipe with perforation holes, connected at the top to the inlet of a pump lowered into a pipe lift column, and a lower plug in the form of a cone tapering from top to bottom, characterized in that the pipe lift column is provided at the bottom with a branch pipe with an upper internal stop and internal brushes installed evenly along the perimeter, the cone at the bottom is equipped with a spring centralizer for the pipe lift column and the branch pipe, the upper internal stop of the branch pipe is designed with the possibility of interaction with the pump, the perforation holes are made below the internal brushes of the branch pipe with the possibility of interaction for cleaning with these brushes when moving the pipe with the pump up and down relative to the branch pipe.