SU1574907A1 - Borehole sucker-rod pump - Google Patents

Abstract

The invention improves the performance of the sucker-rod pump in wells with a low dynamic fluid level by increasing the cylinder filling ratio (C) by reducing the time lag of the suction valve and ensuring its constant opening during the filling period. The suction valve 3 is installed in the lower part of C 1 and communicated with the annular space of the side channel 2. In the case 4 of valve 3, the seat 5 and the locking element 6 are placed. In C 1 there is a hollow plunger 7 with a discharge valve 8. The case 4 is located eccentrically to the axis C 1 The element 6 is installed under the saddle 5, made of ferromagnetic material. Channel 2 is provided with a section 9 parallel to the axis C 1. The diameter C 1 at the location of the housing 4 is larger than the diameter of its main part. 1 il.

Description

The invention relates to a technique of oil production, in particular, to borehole-hose pumps, and can be used in the oil-producing industry when operating wells with low dynamic levels of formation fluids in them.

The purpose of the invention is to increase productivity in wells with low damian fluid pressure by increasing the ratio of the pump cylinder filled by reducing the time lag of the suction valve and ensuring its stationary opening during the filling period.

The drawing schematically shows a downhole sucker rod pump “common in | id.

The borehole sucker-rod pump contains a suction valve 3 installed at the bottom of cylinder 1 and communicated with the annular space of the well (not shown) through the side channel 2 in the cylinder, the seat 5 and the locking element 6 and placed In cylinder 1 there is a hollow plunger 7 with an injection valve 1 1 | Anom 8. The case 4 of the suction valve 3 is located eccentric to the axis of the Cynth Lindre 1, and its locking element 6 is installed under the saddle 5 made of ferromagnetic material. A side channel 2 connecting the suction valve 3 with the well pipe space is equipped with a section 9 parallel to the axis of the cylinder 1, the cylinder diameter at the location of the housing 4 of the suction valve being larger than its main part (not indicated). The cylinder 1 of the pump is connected to the column of pump tubes 10, and the hollow plunger 7 is connected to the column of pump rods 11,

The pump works as follows.

During the course of the string of pump rods 11 and the hollow plunger 7 connected with it upward in the cavity of the pump 1 cylinder, a vacuum and fluid from the well are formed under the hollow plunger through the side channel 2 and its section 9 parallel to the axis of the cylinder, which communicates the suction valve 3 with the well annulus and the opening suction valve enters the cavity of the cylinder under the plunger. In this case, the locking element 6 of the suction valve 3 held in the seat 5, by magnetic force is opened from its seat 5 by the action of a vacuum, the force of its own weight

the locking element 6 and the level of the liquid column in the annulus of the well, and the liquid flows by gravity into the plunger cavity (not indicated) of the pump cylinder 1,

During the course of the string of pumping rods 1J and the hollow plunger 7 connected to it, the fluid pressure in the cavity of the cylinder 1 under the hollow plunger increases, transferring to the locking element 6 of the suction valve 3, and the locking element of the suction valve under the action of this pressure and magnetic force the ferromagnetic material of the saddle 5, is pressed against the latter, blocking its flow area (not indicated) and preventing the return flow of fluid from the cavity of the cylinder 1 into the well, after closing the suction valve 3 opening The injection valve 8 located in the hollow plunger 7 and the fluid from the cavity of the cylinder 1 under the hollow plunger 7 enters the column of pump tubes 10,

Then the cycle of the downhole pump is repeated,

Claims (1)

Invention Formula A downhole sucker-rod pump containing a suction valve installed in the lower part of the cylinder and communicated with the annular space of the well through a side channel in the cylinder, in the body of which a saddle and a locking element are placed and a hollow plunger with a discharge valve placed in the cylinder, characterized in that increasing productivity in wells with a low dynamic fluid level by increasing the filling ratio of the pump cylinder by reducing the suction lag time the valve, and ensuring its constant opening during the filling period, the body of the latter is located eccentric to the cylinder axis, its locking element is installed under the saddle made of ferromagnetic material, and the side channel that communicates the suction valve with the annulus of the well, is provided with a section parallel to the cylinder axis, moreover, the diameter of the cylinder at the location of the housing of the suction valve is larger than the diameter of the main part.