SU972051A1 - Arrangement for pumping liquid from formation - Google Patents

Description

The invention relates to the oil and gas industry and can be used to call the flow of: KA from the reservoir during well completion, as well as to clean the forest zone from the filtrate, solid particles or acid reaction products.

A device for investigating a formation during drilling is known, comprising a drill casing, a packer placed on a drill string, a submersible jet pump and a sampler, the jet pump being placed in an annular cavity above a check valve 1.

The device cannot be removed from the well to the surface without lifting the tubing.

A device for pumping fluid from a formation is known, comprising a housing with openings and a seating seat, an insertable jet pump 2.

However, when the jet pump is removed, all connecting channels are fully opened and free flow of fluid is provided. Such an implementation does not allow separating the cavity of the annular space, which is very important during well development.

The aim of the invention is to provide the possibility of pumping fluid from the sub-packer zone when intake from the formation is called.

The goal is achieved by the fact that a cross-current coupling is installed in the housing, one of the channels

10, which communicates with the housing bore, and the body mounting seat is designed as a spring-loaded bushing for closing the body openings.

1 shows a device for

15 pumping fluid from the reservoir, a vertical section; figure 2 - section aa in figure 1; FIG. 3 is a schematic diagram of the operation of the device.

The device consists of a housing 1,

20 with concentric {Pipe 2 fitted therein, having three radial channels, plug-in jet pump 3 with nozzle -4, coupling 5 cross current, movable sleeve 6 with seal 7, spring 8, bypass channel 9. On the outer surface of pipe 2 seals 10 are installed. The jet pump 3 is removed to the surface by means of a slip-on head 11.

The device works as follows.

Device without jet pump

It is launched into the well on tubing pipes connected

with case 1 device. When this movable sleeve b under the action of the hole 8 closes the channel 9.

In this state of the device, various methods are used to influence the near-wellbore zone of the formation (acid treatment, hydraulic fracturing, etc.). After completing these works, the jet pump 3 with a predetermined characteristic is transported by the fluid flow to the device body 1 and slides down the sleeve b when pressed into the body, compressing the spring 8 and opening the overflow channel 9 connecting the jet pump diffuser with the annular space. ,,

Then, using the packer 12 (Fig. 3), the annular space and the subpacker zone 13 are separated. Flow of pressurized working fluid through the nozzle

4 falls into the displacement chamber 14, involves the flow of fluid from the sub-pakchernoy zone, and then the general flow through the diffuser 15 enters the annulus and moves to the wellhead.

The direction of fluid flow is indicated by arrows.

After calling the inflow from the reservoir and cleaning the near-well zone, the jet pump is removed to the surface with the help of a catcher lowered onto the cable. At the same time, the movable sleeve 6 (figure 1) under the action of the spring 8 again closes the channel 9, which causes annular zone, and the flow of fluid from the reservoir enters the tubing and moves to the wellhead.

The economic effect of the application of the proposed device is achieved by reducing the costs of transporting and operating additional ground equipment (compressors, nitrogen plants), as well as by creating a wide range of values of depression per formation and optimal call flow from the well.

Claims (2)

1. USSR author's certificate number 653386, cl. E 21 V 49/00, 1976, 2. USSR author's certificate number 350927, cl. E 21 V.21 / 00, 1970 (prototype).