RU28892U1 - Device for processing bottom-hole zone of a well formation - Google Patents

Description

1Sh102179

AIMS: E 21 at 43/25

Device for processing bottom-hole zone of a well formation.

The utility model relates to the field of operation and processing of oil, gas, water and other wells, for gas-pulse treatment of the bottom-hole zone of the wellbore.

A device for processing the bottom-hole zone of a wellbore containing a submersible generator of pressure pulses with a working agent located in the housing, representing a powder charge, an igniter of the powder charge, as well as nozzles filled in the housing, designed to exit the gases formed as a result of combustion of the powder charge body cavities, In the initial position of the generator, the nozzle holes are sealed. (See A. S USSR No. 1089348, CL E 21 B 43 / 25.1984.).

The efficiency of processing the bottom-hole zone of the wellbore when using this generator is very low. This is due to the fact that it is difficult to carry out strictly simultaneous depressurization of all nozzle openings. In the event of a depressurization of part of the nozzle openings, the pressure of the powder gases in the cavity of the generator housing drops sharply and some of the openings may turn out to be unpressurized. This leads to the fact that only part of the bottom-hole zone of the well formation is treated, which, of course, reduces the efficiency of the device. The second disadvantage of this device is

OPPORTUNITY ONLY ONE-TIME USE AND NEED

generator replacement.

A device is known for processing the bottom-hole zone of an oil and gas well formation, comprising a system with a hoisting mechanism, a control circuit in which the submersible generator comprises a housing with a high pressure reservoir, in which there is an element for accumulating a gaseous medium, a starting controlled valve, a low pressure cavity, an element initiating a working agent, a working agent and a switching unit, and at least one window made in the housing for supplying gas to the bottom-hole zone of the wellbore, (see pa tent of the Russian Federation No. 2147337, IPC E 21 V 43/25, publ. 10.04.2000, prototype)

The prototype has a significant drawback in the approximate determination of the perforation zone of the well, the submersible generator stops higher or lower than the oil and gas saturated layers, the sticky costs of the working agents, the low productivity of the well after processing, the instability of the device due to the destruction of the body with a complex valve assembly design (burst bolt, damping element ) The second disadvantage of the known device, like the analogue is its disposability and the need to replace or charge the generator.

This utility model eliminates the disadvantages of analogue and prototype.

The technical result of the utility model is the location of the submersible generator in the region of the productive horizon, opposite the oil and gas saturated layers, 2

wells, the stability of the device, saving the expense of working agents, the possibility of repeated exposure to the pre-drilling zone of the wellbore, restoration and improvement of the filtration-capacitive characteristics of the wells, intensification of the flow or increase of the injectivity of the well.

The technical result is achieved by the fact that in the device for processing the bottom-hole zone of the oil and gas wells containing a system with a lifting mechanism, a control circuit, an immersion generator, the housing of which is equipped with a high pressure reservoir. The device is implemented as a mobile equipment complex with an autonomous refueling installation, a set of submersible pressure pulse generators of various sizes, and a system for monitoring and controlling their operation. An autonomous refueling installation comprises a refueling control and management unit and a gas cylinder ramp, the output of which is connected to the pneumatic pump inlet, the output of which is connected to the spool mechanism, and the refueling control and management unit is connected to the electromagnetic valve of the pressure pulse generator.

The essence of the utility model is illustrated by figures 1-4. Figure 1 shows a block diagram of a device where: 1 - a mobile complex of equipment for gas-pulse impact on the well zone of a well formation, 2 - a set of pressure pulse generators of various sizes, 3 - an autonomous refueling unit, 4 - a monitoring and operation system submersible generators and autonomous refueling unit.

Figure 2 presents the refueling scheme for pressure pulse generators - 2, where: 3 - autonomous refueling unit, 5 gas cylinder ramp, 6 - high-pressure pneumatic hydraulic pump, 7 control and refueling control unit, 8 - industrial source of nitrogen gas production.

Fig. 3 shows a diagram of a pressure pulse generator 2 with gaseous nitrogen, where: 9 is a switching unit, 10 is an instrument unit in a low pressure tank, 11 is a working chamber with a valve, 12 is a high pressure tank, 13 is a filling unit.

Figure 4 presents a diagram of a pressure pulse generator 2 with a solid nitrogen source.

Pressure pulse generators 2 are intended for accumulation and delivery of a working fluid to the perforation zone of the well for gas-pulse impact on the bottom-hole zone of the wellbore. The design of pressure pulse generators 2 allows delivering a working fluid to the well in two versions: in a gaseous state (nitrogen gas, FIG. 3) and in a solid state (solid source, nitrogen in FIG. 4). To deliver gaseous nitrogen to the well and use it as a working fluid with a gas-pulse effect on the bottom-hole zone of the well formation, the pressure pulse generator 2 is equipped (Fig. 3):

refueling valve (not shown in FIG. 3),

pressure vessel 12,

a working valve for communicating the high-pressure tank 12 with the working chamber 11, in which there are aperture, evenly spaced, openings for the inlet of high-pressure gas pulses into the well,

a low pressure tank with the instrument unit 10 and a separate switching unit 9. In the low pressure tank 10 there is an electro-pneumatic valve, safety

a valve, pressure and temperature sensors, a cohesive locator for linking the generator to the perforation zone and a gamma radiation detector for 1FILAGING the generator to the reservoir.

For delivery to the well of a solid source of nitrogen and its use as a working fluid with a gas-pulse effect on the bottom-hole zone of the well formation, the pressure pulse generator 2 is equipped (Fig. 4):

a pressure vessel 12, in which a solid source is converted to a gaseous state by sequentially initiating a combustion reaction of a solid nitrogen source in an enclosed space of the tank 12.

A working valve (not shown in FIG. 4), which opens up the access of gaseous nitrogen, when it reaches sufficient pressure in the working chamber 11 with six evenly spaced nozzle openings for gas inlet into the well.

An instrument unit 10 with a locator of couplings for linking the generator 2 to the perforation zone and a gamma radiation detector for linking the generator to the reservoir, with pressure and temperature sensors and a switching unit 9.

The coupling locator allows you to orient the pressure pulse generator 2 with respect to the well perforation zone in the casing string. The gamma radiation detector allows you to accurately orient the pressure pulse generator 2 in relation to the productive section of the rock. The pressure sensor monitors the magnitude and change in pressure both in the zone of gas-pulse exposure and inside the pressure pulse generator 2. The temperature sensor controls its change in the zone of gas-pulse exposure before, during and after

processing. The pressure pulse generator 2 prepared for operation is connected with a cable lug to the geophysical logging cable and lowered into the perforation zone with the help of a hoisting mechanism.

Autonomous refueling unit 3 for refueling pressure pulse generators 2 with gaseous nitrogen at the place of work is mounted in the truck’s KUNG 1 (mobile complex), or in a container for delivering it by any means of transport to the place of work. The autonomous refueling unit includes a gas cylinder ramp 5, consisting of one or several cylinders connected to each other by a single pipeline for receiving, storing and transporting working gas to a place of work under pressure of 15.0 - 20.0 MPa. To protect the gas cylinder ramp 5, its inlet is connected to the industrial source 8 for producing gaseous nitrogen. The process of filling the gas cylinder ramp 5 is controlled by valves and is controlled by pressure gauges. When the set pressure of 15.0-20.0 MPa is reached in the gas cylinder ramp 5, the shutoff valves are closed, the filling pipes are disconnected, after which the stand-alone filling station 3 is ready for transportation.

At the work sites, pressure pulse generators 2 must be filled to a level of 60.0-100.0 MPa. To convert the nitrogen pressure of the gas cylinder ramp 5 to the operating pressure of a pressure pulse generator 60.0-100.0 MPa, an air hydraulic pump 6 is used with a predetermined multiplier. This coefficient is ensured by the correlation of the geometric dimensions of the low-pressure cavity with a larger diameter of the piston and the high-pressure cavity with a small

the diameter of the piston, while the axis of the pistons are made as a whole. The operation of the pneumohydraulic pump occurs with the help of spool assemblies, and the drive is either a pneumatic actuator, where the working fluid is nitrogen gas supplied from gas cylinder 5 or air from the compressor, or another drive (electric).

The monitoring and control system of the mobile complex 4 is intended for pre-setting the operating modes of the pressure pulse generator 2 and their subsequent implementation during operation of the generator at the bottom. Through the monitoring and control system 7, the electromagnetic valve of the pressure pulse generator 2 is turned on and off, the duration and frequency of the pressure pulses are regulated. The connection of the pressure pulse generator 2 to the monitoring and control system 7 is carried out with the help of a logging cable, on which the generator descends into the well processing zone.

Claims (2)

1. A device for processing the bottom-hole zone of an oil and gas well formation, comprising a system with a lifting mechanism, a control circuit, an immersion generator, the casing of which is provided with a high-pressure cavity, characterized in that the device is made in the form of a mobile equipment complex with an autonomous gas station, a set of generators pressure pulses of various sizes, a control and management system for their work. 2. The device for processing the bottom-hole zone of the oil and gas wells according to claim 1, characterized in that the stand-alone gas station contains a control unit and a gas cylinder ramp, the output of which is connected to the inlet of the air pump, the output of which is connected to the spool mechanism, and the unit control and management of the gas station is connected to the electromagnetic valve of the pressure pulse generator.