RU2473790C1 - System of well operation using submersible electric pump by means of packers with cable entry - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: system includes two packers installed on tubing, one of which is located above lower formation and the other one above upper formation, as well as electric centrifugal pump installed in lower part of the pipe. Both packers are provided with electric cable entry. Packer that is located above lower formation has the possibility of being installed mechanically in the well by axial movement of tubing. Packer that is located above upper formation has the possibility of being installed in the well by means of axial unloading of tubing weight and equipped with hydraulic anchor with cable entry.

EFFECT: simpler well operating process in the part of possible reduction of scope of lifting and lowering operations, reduction of down time, as well as possible involvement of a new formation in the operation.

2 dwg

Description

The invention can be used in the operation of wells with leakage intervals above or between productive horizons.

The prior art well pumping unit according to the patent of the Russian Federation No. 2162964, designed to pump water from the underlying aquifers into the upper oil-bearing object. The installation contains a column of pump pipes with a check valve in the lower part, connected with an insert rod pump and lowered into a production string with perforated sections opposite the oil and aquifer formations. Two packers are installed in the annulus above and below the oil reservoir. A nozzle with sealing rings on the inner surface and radial channels, hydraulically connecting the inner cavity of the nozzle with the interpacker zone of the annulus of the well, is installed above the pump cylinder on the pump pipe string. The upper packer, overlapping the annulus above the oil reservoir, is self-sealing and mounted above the radial holes on the nozzle. The self-sealing packer cuff is located in the safety casing, the inner cavity of which is hydraulically connected through the radial holes to the nozzle. The installation allows to increase the efficiency of downhole pumping of water from the underlying aquifer to the overlying oil reservoir by the sucker rod pump due to the simplification of its design and the possibility of studying the operation of the deep pump and reservoirs. The disadvantages of the known system include a long time of descent into the well in view of the need to conduct at least two tripping operations, a large number of structural elements, the overall complexity of the structure and its components.

The tasks solved by the creation of the proposed system consist, firstly, of eliminating the indicated drawbacks of such systems, and secondly, of using an electric centrifugal pump and packers with cable entry, which eliminates the use of additional expensive equipment (rocking machines, rods, etc.) .d.), thirdly, in the operation of the equipment by passing through the packer equipment and reliably sealing the power cable supplying the pump directly to the wellhead without violating its continuity.

The technical result that can be obtained by implementing the claimed design is to simplify the process of operating the well in terms of the possibility of reducing tripping, reducing downtime, as well as the possibility of involving a new formation in operation.

The set result in the claimed system for the operation of wells with upper and lower layers containing two packers installed on the tubing, one of which is located above the lower layer, the second is above the upper one, and also installed in the lower part of the pipe electric centrifugal pump, is achieved by that both packers are made with cable electric inlet, while the packer located above the lower layer is made with the possibility of mechanical landing in the well by axial movement (up-down) of the pump-compressor a weed pipe, and the packer located above the upper layer is made to fit in the well by axial unloading of the weight of the tubing and is equipped with a mechanical anchor with the possibility of fixation, as well as a hydraulic anchor with cable entry.

The claimed system is illustrated by a schematic diagram of its implementation when oil is produced from the lower reservoir (Fig. 1) and when pumping oil or reservoir fluid from the lower to the upper reservoir (Fig. 2).

The basically declared system includes sequentially (from bottom to top) 1 electric centrifugal pump (ESP) 2 installed on the tubing (NTs) 2, an axial mechanical packer (PVM-O (KB)) 3 located above the upper layer, a persistent packer installed above the lower layer mechanical (PU-M (KV)) 4 and located above the PU-M (KV) hydraulic anchor (YaG2 (KB)) 5. In the case of pumping oil or reservoir fluid from the lower to the upper reservoir, the system is additionally equipped with a filter 7 (figure 2 ) The power supply of the ESP is carried out by means of an electric cable 6, passed through the packer and the anchor without violating the integrity, which is a distinctive feature of the claimed design in view of the fact that it uses packers with cable entry.

The peculiarity of such packers is that they allow tight isolation of the intervals of the casing string to cut off the upstream zone of its leakage, protect the reservoir and continue the selection of formation fluid using ESP without repairing the string, while installing packers, as noted above, passes without breaking the conductors of the electrical cable.

The PVM-O (KV) 3 design includes an anchor device mounted on the spindle in the form of sliding and anchoring blocks pivotally connected to each other. The sliding block consists of a cage with centralizers, and the anchoring block consists of a housing with spring-loaded dies. Through the internal cavity of the spindle, a barrel passes, in the upper part connected to the adapter. The latter is located in the cavity of the coupling installed between the anchor device adapter on the spindle. In the upper part of the packer, between the anchor device and the coupling, there are also a cone, cuffs and a spacer. The cable passes through the holes on the coupling and the cavity between the barrel and the spindle.

The design of the PU-M (KV) 4 includes a spindle, in the upper part of the packer connected to the upper sub, on which the coupling is screwed, and on the spindle, below the sub, the housing of the die holder of the upper with spring-loaded dies is installed. The lower packer housing of the upper packer contains an upper cone, cuffs and a spacer. Through the internal cavity of the spindle, a barrel passes, in the upper part connected to the adapter. The cable is also passed through the holes on the sleeve and the cavity between the barrel and the spindle.

The design of the YaG2 (KB) 5 includes a housing with radial holes in which dies with sealing and protective rings are spring-loaded. From falling out the dies are fixed by means of slats. On the case there is a longitudinal groove for passing an electric cable. The anchor is screwed onto the PU and lowered onto the tubing to a predetermined depth.

The layout of the claimed system allows for its collection and descent into the well together with the pump in one round-trip operation.

Claims (1)

A system for operating wells with upper and lower layers, containing two packers installed on the tubing, one of which is located above the lower layer, the second is above the upper one, and also an electric centrifugal pump installed in the lower part of the pipe, both packers are made with cable electric inlet, while the packer located above the lower layer is made with the possibility of mechanical landing in the well by axial movement of the tubing, and the packer located above the upper layer with the possibility of planting in the borehole by weight axial unloading of the tubing and is provided with a hydraulic anchor with cable gland.

Images