SU1687870A1 - Deep-well bull pump - Google Patents

Abstract

The invention can be used in the oil industry when pumping formation fluids from wells. The purpose of the invention is to increase the reliability of the pump by providing a stable one. centering the hollow plunger in the cylinder both during the course of the column upwards and during the course downwards. In the lower part of cylinder 1, a suction valve 2 is placed. In cylinder 1 there is a hollow plunger 3, in the wall of which through radial channels 4 arranged in a staggered pattern are made, hydraulically connecting the cavity of pump tubes with a gap of a pair of plunger 3 - cylinder 1. In the plunger cavity 3 The discharge valve 6 is located. In the wall of the plunger 3, on the side of its inner end, there are open vertical channels 7 on top, hydraulically connected to the radial channels 4. The discharge valve 6 is located on the side of the upper torus. ca plunger 3. 2 Il. with Ј;

Description

This invention relates to a technique for producing oil, in particular to the mining industry when pumping formation fluids from wells.

The purpose of the invention is to increase reliability by ensuring the stability of the centering of the hollow plunger in the cylinder.

Figure 1 is a schematic representation of a downhole sucker-rod pump (longitudinal section); figure 2 - section aa in figure 1.

The borehole sucker-rod pump contains a cylinder 1 with a suction valve 2 located in its lower part. A hollow plunger 3 mounted in cylinder 1, in the wall of which through radial channels 4 arranged in a staggered manner are hydraulically connecting the cavity of the column of pump tubes (not shown) with a gap 5 pairs of hollow plunger 3 - cylinder 1, as well as a discharge valve 6 located in the cavity of the plunger 3. In the wall of the hollow plunger 3 on the side of its upper end, vertical channels 7 are open at the top, hydr It is connected to radial valves 4, and the discharge valve 6 is located on the side of the upper end of the hollow plunger 3 connected to the column of pump rods 8.

The described downhole sucker rod pump works as follows.

During the course of the column of pump rods 8 and with it the hollow plunger 3 upward the discharge valve 6 is closed, and the pressure of the column pumped out of the well (not shown) reservoir fluid in the cavity 1 above the hollow plunger 3 will be transferred into the gap 5 pair of hollow plunger 3 - cylinder 1 both from above and from the side through the radial channels 4 in the wall of the hollow plunger 3, the suction 2 valve is open and the formation fluid is sucked from the well into the cavity of cylinder 1 under the plunger, and the formation fluid located in the cavity of cylinder 1 above the hollow plunger 3 , P dnimaets pumping through the column pipe surface.

During the course of the string of pump rods 8 and with it of the hollow plunger 3 down the suction valve 2 is closed, the discharge valve 6 is open, and the formation fluid is bypassed from the cavity of the cylinder under the hollow plunger 3 into the cavity of the cylinder above it. The load on the weight of the column of formation fluid in the cavity of the cylinder 1 above the hollow plunger 3 on the hollow plunger itself is essentially absent.

The reservoir fluid, which is constantly located in the additional vertical channels 7 open at the top, made in the wall of the hollow plunger 3 on its side

the upper end, under the pressure of its column in the cavity of the column of pump tubes, regardless of whether the hollow plunger 3 moves down or up, due to the message of additional vertical channels 7 through radial channels 4 with a gap of 5 pairs of hollow plunger 3 - cylinder 4 at different levels staggered, contributes to the strict alignment of the hollow plunger in the cylinder cavity throughout

length.

Claims (1)

Claims of Invention: A borehole sucker-rod pump comprising a cylinder with a suction valve placed in its lower part, A hollow plunger mounted in the cylinder, in the wall of which through radial channels arranged in a checkerboard pattern, hydraulically communicating the cavity of the tubing string with a gap of a pair of hollow plunger - cylinder, as well as a discharge valve located in the plunger cavity, characterized in reliability by providing a stable centering of the hollow plunger in the cylinder, both during the course of the rod of the pumping rods up and down in the wall of the hollow plunger from the side of its upper end Yen open vertical channels. hydraulically connected with radial channels, and the discharge valve is located on the side of the upper end of the canopy. Figg