SU1760098A1 - Device for preparation and development of wells - Google Patents

Abstract

The invention relates to the oil and gas industry. The purpose of the invention is to increase the efficiency of the device by creating in the wellbore zone a pressure pulsation of a borehole fluid (G). The device consists of a housing 1 with an overflow channel 2, high 3 and low 4 pressure chambers, a pneumatic chamber 5 and channel 6 to communicate the chamber 4 with a cavity under the body, nozzles 7, a two-stage plunger 8 with a conical end surface 9 and sealing elements 10, a check valve 11c with a plug 12, cuffs 13, nuts 14, a seating ring 15 with a sealing element 16, a pumping com of spring pipes 17c radial bore 18. The working agent is fed into the housing 1. The expiration of liquid in duct 2 leads to a decrease in pressure in the suction chamber 4 and the reservoir fluid. At the same time, the plunger 8 performs radial oscillatory movements and causes pressure pulsations in the bottomhole zone. 3 il. THX

Description

The invention relates to the oil and gas industry, namely, devices for inducing inflow from a formation and exposing a production object to hydrodynamic pulses in order to deactivate it.

A device for pulse treatment of the near-wellbore zone of wells is known. The disadvantage of this device is the low power of pulses and a small radius of influence on the near-well zone.

The closest technical solution to the present invention is a device for pumping fluid from reservoir 2. The disadvantage of this device is the impossibility of hydro-impulse action.

on the okolostvolnoy zone in the presence of the created depression on the reservoir.

The purpose of the invention is to increase the efficiency of the device by creating in the wellbore zone a pressure pulsation of the well fluid.

The goal is achieved by the fact that a device for treatment and development of wells, including a housing with a bypass channel and high and low pressure chambers, a nozzle installed in the housing above the bypass passage, and a packer mounted under the housing, is equipped with a two-stage plunger, and , filled with compressed gas, and a channel for communicating the low pressure chamber with the cavity under the housing.

x | oh oh u

00

wherein the plunger is installed in smaller and larger diameters, respectively, in the low pressure chamber and in the pneumatic chamber with the possibility of interaction with the nozzle.

Figure 1 shows the proposed device; figure 2 - section aa in figure 1; on fig.Z - section bb in figure 1.

The device consists (Fig. 1-3) of body 1 with bypass channel 2, high 3 and low 4 pressure chambers, pneumatic chamber 5 and channel 6 for communicating the low pressure chamber with the cavity under the casing, nozzle 7, two-stage plunger 8 with a conical smaller end surface 9 and sealing elements 10, check valve 11 with plug 12, cuff 13, nuts 14, landing ring 15 with sealing element 16, pump-compressor pipes 17 with radial bore 18.

The device works as follows.

In tubing 17, prior to their descent at the depth of installation of the device, the landing ring 15 with the sealing element 16 is attached. Simultaneously with the descent of the tubing, the device is assembled.

After the descent of the tubing is completed, the device is assembled in the wellhead assembly and then delivered to the installation site by the hydraulic flow of the working fluid. Before installing the device in the wellhead, the chamber 5 through the check valve 11 is filled with compressed gas at a given pressure.

After landing, the devices on the landing ring 16 are unpacked (the packer is not shown in the figure), and an overpressure is created at the wellhead. The fluid flow from the high-pressure chamber 3 through the nozzle 7 rushes into the overflow channel 2. The liquid filled in your low-pressure chamber 4 rushes along with the flow into the overflow channel 2, and a vacuum is created in the low-pressure chamber 4. As a result, fluid will begin to flow through channel 6 from the zone of the productive object into the low pressure chamber. The bottomhole pressure in the area of the productive horizon begins to decrease. After the predetermined depression is created on the production object, and the pressure difference between chamber 4 and cavity 19 between the device body 1 and tubing 17 reaches a certain value, the stepped plunger 8 will start moving towards the low pressure chamber 4 and block the flow with its conical end 9 the fluid coming from the nozzle 7. The speed of the flow will drastically decrease,

and the pressure in chamber 4 will increase dramatically. Accordingly, the speed of movement of the injected flow through channel 6 will sharply decrease. As a result, the near-barrel zone

a pressure boost pulse will be transmitted to the productive object. By increasing the pressure in chamber 4 and, accordingly, the pressure on the end conical surface 9 of the plunger 8, the plunger is returned to its original position, opening movement to the flow from the nozzle 7 to the overflow channel 2. This will again reduce the pressure in the low pressure chamber 4. Pressure reduction pulse through channel

5 6 transmitted to the near-wellbore zone of the formation. Thus, when the device is operating against the background of a general (main) depression, the formation will be affected by alternating pulses of increase and pressure reduction, which will increase the efficiency of the device. The intensity and magnitude of alternating loads is governed by the gas pressure in chamber 5 and the flow rate of the jet from

5 nozzles 7.

The cavity 19 is isolated from the tube space and the high-pressure chamber by means of the cuff 13.

After the inflow call process

0 or the decolmation of the formation is completed, the packer is removed and the reverse circulation of the fluid begins. As a result, the pressure under the device in the tubing increases, and the device rises to the surface with the flow of liquid.

By implementing the proposed invention, an economic benefit can be obtained, which is calculated on the basis of reducing the testing time and obtaining additional oil production from the well.

By introducing a device into Belorusneft software, the duration of testing a 1st well can be reduced in

5 average for 2 days. With an average well depth of 3500 m, the cost of one day of testing averages 900 rubles. Therefore, by reducing the testing time, an economic effect can be obtained.

0 900 rub 2 days 1800 rub. on 1 well

After exposure to the formation using the proposed device, the average well flow rate can increase by 5 tons / day. The number of days of effect is 40. Then, an additional 5 pa of oil production will be 200 tons per 1 well. At a cost of 1 ton of additional oil produced 25 rubles. the economic effect on one well will be

25 rub. x 200 t 5000 rub.

The total economic effect will be

1800 + 5000 6800 rub. on 1 well

Taking into account the need to use the device at 20 wells per year for the conditions of the association Belorusneft, the annual economic effect will be 6800 x 20 well 1.313 rubles.

Claims (1)

Invention Formula A device for treatment and development of wells, including a housing with a bypass channel and high and low pressure chambers, a nozzle installed in the housing above the relief valve, and a packer mounted below the housing. different0 e with that. In order to increase the efficiency of the device by creating pressure pulsations in the wellbore zone of the well fluid, it is equipped with a two-stage plunger, and a pneumatic chamber filled with compressed gas and a channel for communication of the low pressure chamber with the cavity under the body are made in the housing, the plunger steps of smaller and larger diameters, respectively, in the low pressure chamber and the pneumatic chamber with the ability to interact with the nozzle. # tPw.3