SU863839A1 - Bypass sleeve for periodic independent production from two formations - Google Patents

Description

(54) PERFORMANCE COUPLING FOR PERIODICALLY DIVIDED OPERATION OF TWO PLATES

The invention relates to the extraction of oil in the case of simultaneous periocycical exploitation of two depleted or weakly permeable reservoirs of one well. A known bypass coupling for periodically-separate exploitation of productive formations, consisting of a glass, in whose Day there is a hole, communicating with the sub-packer space. A plate-type switching valve with packing gaskets is installed in the glass with the possibility of alternately closing the channel connecting the pump intake to the hole in the bottom of the glass and the figured channel made in the upper part of the overflow coupling connected with the over-pack-die tube space. The differential pressure of the upper and lower layers moves the switching clap; the latter, in turn, closes the opening in the bottom of the glass or shaped channel. Thereby, automatic alternating reservoir operation with a single pump should be provided. This bypass coupling has the following disadvantages: a switching valve with gaskets when the valve is seated on the overlapping seat holes when the seal has not yet touched the surface of the seat, the seal on the metal parts is exposed to hydraulic erosion; work surfaces, “x. alignment and parallelism; with loss of tightness associated with the destruction of the sealant, the integrity of the sealing surface, or the ingress of abrasive and postonon objects on the surface between the saddle and the plate, the hydroerosion destruction begins. All this leads to a sharp decrease in the reliability of the automatic switching of two layers. The valve closest to the invention to the technical essence and achievable re-ulguga is to turn off the downhole mechanisms, which includes a housing built in the pump-aggregate coarse canals with channels informing the pump intake with the in-line and bulkhead pipelines. In the upper part of the channels there are saddles under the G2 shutoff organ.

The disadvantage of this device is the inability to periodically separately operate two formations with one pump.

The purpose of the invention is to increase the reliability of the device operation by allowing the periodic operation of two marginal reservoirs.

This goal is achieved by the fact that. Shoulder transfer mufgy: equipped with a stop of the valve in the upper part of the sleeve and made with two additional diverting channels connecting the in-tube and annulus spaces to the pump intake.

FIG. Figure 1 shows schematically a bypass coupling for automatic periodicity of separate operation of two layers; in fig. 2 shows section A-A in FIG. one; in fig. 3 - assembly diagram of the installation of the overflow coupling in deep-well pumping equipment.

The bypass coupling includes a housing 1 and a head 2, in which inclined-flow channels 3 and 4 are made, in the upper part having i-fanocTb, representing the central channel 5. In the housing 1 there are mounted 6 and 7 seats for the locking member 8, which has the possibility of alternately blocking channel 3 with the cavity of channel 9 or channel 4 with the cavity of the shaped channel 1O. Channels 9 and 10 serve respectively for the entry of fluid from the lower (subpacker) and upper (suprapacker) formations. In the head 2, a stop 11 of the closure member 8 is installed. The head 2 is attached to the body 1 by means of two bolts 12, and the body 1 is in turn connected to the intake of the pump 13 by the coupling 14 and the coupling 15 to the tubing 16 and the packer 17

The diameter d and the angle cL of the obliquely diverging channels are chosen in such a way as to ensure the lifting and rolling of the sealing organ 8 at a pressure difference of a column of fluid from the lower and upper layers.

The bypass coupling works as follows.

The production of the upper layer through the shaped channel 1O, the opening of the saddle 7 enters the cavity of the inclined channel 4 and enters through the central channel 5 on

intake of a deep-well pump 13. In this case, the locking member 8, which is in the saddle 6 and overlaps the channel 9, communicates with the cavity of the podpakernoy space, are: bottom pressure force

bottom layer, top - the force of the upper layer pressure. Thus, on Sharn 8 there are two forces that are equal to the pressure of the liquid column multiplied by the area of the saddle aperture. At this time, pump 13

5 is pumping from the upper layer.

Since the reservoirs have low yield rates, the selection of fluid leads to a lowering of the level of the liquid column, while in the lower reservoir (in the under-packer space),

0 where there is no pumping out, the liquid bounces; falls into the zone of reduced pressure of the inclined channel 4 and closes the opening of the saddle 7, thereby blocking the channel 10, which communicates with the cavity of the annular nadpaknernogo space (upper layer). The submersible pump 13 continues pumping fluid from the lower reservoir, while in the upper reservoir the accumulation process takes place, and when the pressure of the liquid column of this reservoir exceeds the pressure of the lower reservoir, the next reservoir switch occurs. If the pressures in both layers are equal, the closure body 8 will, due to its weight, be in seat 6 or 7 and the pump will continue pumping fluid from the reservoir, which communicates with the pump intake.

Saving from the use of the invention will be 730 rubles. per year per well.

Claims (2)

1. USSR author's certificate No. 603742, cl. E 21 B 43/00, 1973. 2. USSR author's certificate number ZO 6243, class, E 21 V 17/00, 1969 (prototype). FIG. 2 t / e.3