RU2187700C2 - Submersible sucker-rod pump - Google Patents

Abstract

FIELD: pulse bed stimulation in oil recovery. SUBSTANCE: submersible sucker-rod pump which is run into well in tubing string has housing with suction valve and plunger with discharge valve. Shut-down fitted above suction valve is used for periodic pulse bed stimulation; this shut-down has seat and cylindrical gate pressed by spring; this gate has bypass passage and tappet. On surface of gate there is program slot which receives lock secured in housing. While getting at point "A" and "B", lock holds gate in two positions: OPEN and CLOSED. To shift to pulse mode of operation, plunger is lowered below point of working stroke forcing tappet downward, thus shut-down is thrown to CLOSED position. After pulse bed stimulation, tappet is acted on by plunger to shift to pump mode of operation and shut-down is thrown to OPEN position. EFFECT: considerable simplification of construction. 3 dwg

Description

 The invention relates to sucker rod pumps for pumping oil from wells and can be used for pulsed impact on the reservoir during production.

 Known pumping unit for the simultaneous selection of oil and pulsed effects on the reservoir, comprising a housing with a side opening for receiving reservoir fluid and a plunger with a discharge valve (RU 1830222 C1, 1990).

 The disadvantage of the installation is that it generates pulses continuously, and this leads to increased wear of the equipment. In addition, the generated pulses are not powerful enough due to the low level of fluid in the pumping wells.

 Also known is a sucker rod pump containing a housing with a suction valve and a plunger with a discharge valve that is lowered into a well on a tubing string (Amirov A. D. et al. Overhaul of oil and gas wells. M .: Nedra, 1975, p. 69 -71, Fig. 11.12).

 A disadvantage of the known pump is that it does not provide a powerful pulsed impact on the formation, for the duration of which the pump in the well must be replaced by a pulse installation.

 Closest to the claimed design is a submersible sucker rod pump comprising a housing with a suction valve, a plunger with a discharge valve and a shut-off device installed between the plunger and the suction valve (RU 2140526 C1, 10.27.1999).

 A disadvantage of the known pump is the design complexity.

 The technical challenge facing the invention is to enable periodic intense pulsed impact on the formation using a rod pump of a less complex design.

 The problem is solved in that in a submersible rod pump containing a housing with a suction, a plunger with discharge valves and a shut-off valve for cutting off the suction valve from the pump cavity, switched by the plunger when lowering it below the lower point of the stroke, the shut-off valve is made in the form of a valve with a spring-loaded cylindrical shutter , on the surface of which a program groove is made, which includes a latch fixed in the pump housing, while in the cylindrical shutter of the shut-off, a channel is made that communicates the gate a space with a supervising space for passing liquid through the shutoff.

 The invention is illustrated by drawings, where in Fig.1 shows a diagram of the installation of the pump in the well, in Fig.2 shows a cutter, in Fig.3 - a program groove.

 The pump, which is lowered into the well 1 on the tubing string 2, consists of a housing 3 with a suction valve 4 and a plunger 5 with a pressure valve 6. Above the suction valve 4, a shut-off device is installed, including a seating seat 7 and a cylindrical shutter 8, on the surface of which a software the groove 9, which includes the latch 10, mounted in the housing 3. The latch 10, getting to the points "A" and "B", locks the shutter 8 in two positions, respectively, "open" and "closed". The cylindrical shutter 8 is preloaded by the spring 11, and a channel 12 is made in its body for liquid bypass. In the upper part of the shutter 8 is made with a pusher 13.

 With the shut-off valve open (lock 10 is located at point “A”), the pump operates in the main mode, while the lower point of the working stroke of the plunger 5 is above the pusher 13, which protrudes above the seat 7. The fluid from the well through the suction valve 4, channel 12, the body cavity 1 and the discharge valve 6 is supplied to the column 2 and then to the surface.

 To switch to the pulse action mode, the plunger is lowered below the lower point of the working stroke and, pushing the pusher 13 down, the shut-off valve is switched to the “closed” position (the latch 10 is at point “B”), after which the plunger is raised so that it would during operation at the top point out of cylinder 3.

 A rocking machine (not shown) is turned on. When the plunger moves upward, a vacuum is formed in the casing 3, into which, after the plunger exits the casing, a column of liquid rushes from the tubing string 2 and creates a shock pulse, which propagates through the borehole and is transmitted to the formation. The frequency of pulses and the duration of exposure are set by the work of the rocking machine.

 To switch to the pump operation mode, the plunger again acts on the plunger 13 and puts the cutter in the "open" position.

 Thanks to the design changes of the pump, it is possible to impulse impact on the reservoir at any selected point in time.

Claims (1)

 A submersible sucker-rod pump comprising a housing with a suction valve, a plunger with a discharge valve and a shut-off device installed between the plunger and a suction valve, characterized in that the shut-off valve is made with a spring-loaded cylindrical shutter, on the surface of which a program groove is made, into which a latch is mounted, fixed in the housing pump, while in the cylindrical shutter of the shut-off, a channel is made that communicates the shut-off space with the shut-off space for passing liquid through the shut-off.

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