RU133558U1 - ANTI-SAND ANCHOR - Google Patents

Abstract

1. An anti-sand anchor containing a chamber for collecting sand and mechanical impurities, which can be installed in the well under the receiving pipe of the downhole pump and communicated with the first channel with the annulus, characterized in that it is equipped with a washing unit made in the form of a second channel with a valve connecting at in its open position, a chamber for collecting sand and solids with a source of washing liquid. 2. The anti-sand anchor according to claim 1, characterized in that it is provided with a flow disconnector having the ability to be installed above the inlet of the suction port of the downhole pump, and the first and second channels are made in the disconnector. The anti-sand anchor according to claim 1, characterized in that it is equipped with a flushing nozzle with inclined channels installed in the chamber for collecting sand and solids.

Description

The utility model relates to oil-producing equipment and can be used in the development and operation of oil and water wells to filter well fluid from mechanical impurities (sand, sludge).

Known downhole filter, which is a filter unit (patent RU 2408779, IPC E21 B 43/08, publ. 10.01.2011), consisting of two concentrically arranged pipes, containing a filter element, an impurity storage device ending with a plug.

The disadvantage of this filter is the need for frequent tripping operations to clean the filter and the impurity storage device, which complicates its operation.

Closest to the claimed and adopted as a prototype is an anti-sand anchor (patent RU 77332 U1, IPC ЕВВ 21/00, published on October 20, 2008), which is a prefabricated structure, lowered into the well on a tubing string (tubing) connected to the tubing by couplings and containing a chamber for collecting sand and solids, which can be installed in the well under the receiving pipe of the downhole pump and communicated with the first channel with the annulus.

The disadvantage of such an anchor is the need for frequent hoisting operations to clean the impurity accumulator, which complicates its operation.

The objective of the claimed utility model is to increase the ease of use by providing the ability to clean the impurity storage without tripping.

The problem is solved by improving the anti-sand anchor, containing a chamber for collecting sand and solids, which can be installed in the well under the inlet pipe of the downhole pump and communicated with the first channel with the annulus.

This improvement consists in the fact that the anchor is equipped with a washing unit made in the form of a second channel with a valve connecting, when it is open, a chamber for collecting sand and solids with a source of washing liquid.

This constructive implementation of the anchor allows you to provide the ability to clean the accumulator of impurities without removing the pump and anchor from the well and carrying out tripping operations.

In addition, the anchor can be equipped with a flow disconnector, which can be installed above the inlet of the suction port of the downhole pump, and the first and second channels are made in the disconnector - an option for the rational execution of the armature, which allows for the supply of borehole fluid to the pump during production and during washing - supply of washing liquid to the chamber for collecting sand and solids and its removal into the annulus.

In addition, the anchor can be equipped with a flushing nozzle with inclined channels installed in the chamber for collecting sand and solids, which facilitates the removal of sand and other solids.

The utility model is illustrated by a drawing, in which Fig. 1 shows the proposed anti-sand anchor installed in a well with a plunger pump during production (arrows indicate the flow of well fluid), and Fig. 2 shows the same during washing (arrows indicate the flow of washing fluid). Figure 3 is a section aa of figure 1 and 2, figure 4 shows the proposed anchor anti-sand, installed in the well with a screw pump during production.

The anti-sand anchor contains a chamber 1 for collecting sand 2 and mechanical impurities, which can be installed in the well under the receiving pipe 3 of the downhole pump 4 (plunger) and communicated by the first channel 5 with the annulus 6. The anchor is equipped with a washing unit made in the form of a second channel 7 with a valve 8, connecting when it is open, the chamber 1 collecting sand 2 and solids with a source of flushing fluid (not shown). In the above embodiment, the anchor is equipped with a disconnector 9 flows, with the ability to install above the inlet 10 of the receiving pipe 3 of the downhole pump, and the first 5 and second 7 channels are made in the disconnector 9. To facilitate the removal of sand and other mechanical impurities during washing in the sand collection chamber 1 is installed the flushing nozzle 11, made in the form of a pipe with channels in which nipples 12 are installed in the form of sleeves under the flange, through which flushing fluid is supplied under pressure. The cuff 13 prevents the subsidence of sand on the bottom of the well. In the embodiment of FIG. 4, an anti-sand anchor is installed in the borehole beneath the inlet pipe 3 of the screw pump 14, with the reference numeral 15 being the assembly fixing the pump stator and tubing from the lapel.

An anti-sand anchor works as follows.

The layout of downhole equipment is lowered into the well at the tubing string to the required depth. Wellhead equipment is being installed and a well is being launched. In this case, the borehole fluid with sand and other mechanical impurities passes from the annulus 6 through the first channel 5 into the inlet pipe 3 of the borehole pump 4. At the inlet to the inlet pipe 3, the borehole fluid changes direction and goes to the pump 4. Sand and other mechanical impurities under the influence of gravity they settle down into the chamber 1. The anchor will work until the chamber1 is filled with settled particles and mechanical impurities. After that, the anti-sand anchor is washed by supplying washing liquid to the tubing string under pressure through channel 7 through an open valve 8, washing pipe 11 with nipples 12 into chamber 1. At the same time, the liquid and sand and mechanical impurities deposited in chamber 1 are mixed. Further, the flow of washing liquid carries sand and other mechanical impurities through the channel 5 into the annulus 6 and then at the wellhead. When this cuff 13 prevents the subsidence of sand and other mechanical impurities on the bottom of the well.

Thus, the application of the claimed utility model allows to improve operating and cleaning conditions for wells equipped with both plunger and screw pumps from sand, sludge and other mechanical impurities, without costly tripping operations.

Claims (3)

1. An anti-sand anchor containing a chamber for collecting sand and mechanical impurities, which can be installed in the well under the receiving pipe of the downhole pump and communicated with the first channel with the annulus, characterized in that it is equipped with a washing unit made in the form of a second channel with a valve connecting its open position is a chamber for collecting sand and solids with a source of flushing fluid. 2. The anti-sand anchor according to claim 1, characterized in that it is equipped with a flow disconnector having the ability to install a suction pipe of the downhole pump above the inlet, and the first and second channels are made in the disconnector. 3. The anti-sand anchor according to claim 1, characterized in that it is equipped with a flushing pipe with inclined channels installed in the chamber for collecting sand and solids.

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