RU2552405C1 - Method of simultaneous-separate liquid injection as per reservoirs with possibility to measure parameters of injected liquid and installation for its implementation - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: installation comprises underground equipment assembly run in the well using the pipes string, including funnel-positioner, lower packer, reducer-positioner, device of injection distribution, top packer, extension. Device of injection distribution contains casing and removable parts, is equipped with to independent pressure gauge, middle independent pressure gauge, and bottom independent pressure gauge. Top and bottom unions are installed in the removable part of the device of injection distribution with possibility of both unions removal by one round run operation.

EFFECT: assurance of possibility of information acquisition on injection pressure upstream and downstream each union for long time period, reception of reliable data on injection mode, increased process reliability.

4 cl, 2 dwg

Description

The invention relates to the oil industry and can be used for simultaneous-separate injection into two layers with the possibility of distributing the total injected volume into the layers in the required proportion and measuring the parameters of the injected liquid.

The known method selected for the prototype, which consists in the fact that in the well on the string of tubing - tubing is lowered layout, including the lower packer, disconnector, injection distribution device - URZ, upper packer, disconnector. The lower part of the layout is equipped with a funnel or shank, and the upper part of the layout is equipped with an extension. Above the lower and upper packers, a centralizer is installed. Install and pressure packers. Lower the depth meter with the plug above the last seat. They supply fluid to the tubing, determine the total fluid flow. Lower the cork into the seat, supply fluid to the tubing, determine the flow rate of the fluid pumped into the lower layer. Subtract it from the total flow rate and find the flow rate of the fluid pumped into the upper reservoir. The actual fluid flow rates for the formations are compared with predetermined values. With their difference, the extracted part of the URZ is raised to the surface. Install the upper and lower fittings in the seats. The extracted part of the URZ is lowered into the tubing before its landing in the hull of the URZ. Carry out adjustable injection in the reservoirs. To isolate one of the layers, a plug is installed instead of the fitting. At the end of the work, the installation is hoisted.

URZ includes a body part consisting of a nipple with several through channels, a body and an adapter sleeve, an extractable part consisting of an upper and lower sleeve and a diffuser. Seats under the upper and lower fittings or caps are made in the upper sleeve and diffuser. In the upper sleeve there is a seat for the cork. The upper and lower central channels, diverging and converging channels (RF patent No. 2495235, publ. 10.10.2013) are made in the lower sleeve.

The disadvantage of this method is the need to lower the depth of the flow meter to conduct only a single measurement of the flow rate of the injected fluid without the possibility of recording parameters for a long period, for example a month. Another disadvantage is that when one of the layers is turned off, errors are possible due to a change in the injection mode.

The technical result of the proposed method and installation is the ability to obtain information about the injection pressure before and after each nozzle for a long period of time without using a large number of additional devices and without changing the injection mode, obtaining reliable data on the injection mode necessary to form the correct operating mode wells, as well as improving the reliability of technology.

The technical result is achieved by implementing a method for simultaneously separately injecting fluid into the reservoirs with the possibility of measuring the parameters of the injected fluid, including the descent into the well on the pipe string of the installation, consisting of a funnel-centralizer, lower packer, sub-centralizer, injection distribution device, upper packer, extension, installation lower and upper packers, pressure testing of the annulus above the lower and upper packers, fluid supply to the pipe string, determination of fluid flow rates in the layers, s comparing the actual fluid flow rate for formations with specified values, lifting when they differ the extractable part of the injection distribution device to the surface using a fishing tool on a geophysical cable, wire or coiled tubing, installing the upper and lower nozzles in the seats of the extractable part of the injection distribution device, removing the extractable parts of the device for distributing injection into a pipe string on a geophysical cable, wire or coiled tubing installation before it fits into the casing part of the injection distribution device, the implementation of an adjustable liquid injection, the installation lifting upon completion of work, while according to the invention, the injection distribution device is equipped with an upper autonomous pressure gauge installed above the upper nozzle, an average autonomous pressure gauge installed under the upper nozzle, and a lower autonomous pressure gauge installed under the lower fitting, supply fluid to the pipe string, measure the pressure of the fluid injection before and after the upper and lower fittings using him, the middle and lower standalone pressure gauges, record the pressure drop on the upper and lower fittings during the injection process, calculate the flow rate of the fluid pumped into each reservoir from the pressure drop, compare the actual fluid flow rate for the formations with the given values, raise the actual flow rates from the set values extractable part of the injection distribution device together with stand-alone pressure gauges and fittings to the surface using a fishing tool on a geophysical cable, wire or coiled tubing ingovy installation, replace the upper and lower fittings in the extractable part of the injection distribution device, lower on a geophysical cable, wire or coiled tubing installation the extractable part of the injection distribution device into the pipe string before it fits into the body of the injection distribution device, supply liquid to the pipe string and lead repeated measurements of fluid injection pressure before and after the upper and lower fittings.

To achieve the goal, the following particular solutions can be used:

- installation above the lower and / or upper packer is equipped with a mechanical or hydraulic operating principle disconnector;

- under the upper packer install a sub-centralizer.

The technical result is achieved by using the installation for simultaneously separate injection of fluid into the reservoirs with the possibility of measuring the parameters of the injected fluid, including a funnel-centralizer, a lower packer, a sub-centralizer, an injection distribution device, an upper packer, an extension, and according to the invention, an injection distribution device (for example, UR3-114) is equipped with an upper autonomous pressure gauge installed up to the upper fitting, an average autonomous pressure gauge installed under the upper fitting, and lower autonomous with a manometer installed under the lower nozzle, while the upper and lower nozzles are located in the extractable part of the injection distribution device with the possibility of extracting both nozzles in one round trip.

The installation diagram for controlled injection of fluid into the reservoirs with the possibility of measuring the parameters of the injected fluid is shown in FIG. 1. A diagram of an injection distribution device (for example, UR3-144, manufactured by LLC NPF Packer, Oktyabrsky) with autonomous pressure gauges and fittings is shown in FIG. 2.

The installation consists of a layout of underground equipment lowered into a well 1 (Fig. 1) on a pipe string 2, including a centralizer funnel 3 (for example, VTs-73 produced by OOO NPF Packer, Oktyabrsky), lower packer 4 (for example, ABM -YAMO3-122 produced by LLC NPF “Packer”, October), a centralizer 5 (for example, PC-124 produced by LLC NPF “Packer, October), a distribution device for injection 6 (for example, UR3-114 manufactured by LLC NPF “Packer”, Oktyabrsky), top packer 7 (for example, PRO-YaVZh-M-S-122 manufactured by NPF “Packer”, Oktyabrsky), carrier 8 (for example, US-118 manufactured by NPF Packer LLC, Oktyabrsky). Above the lower 4 and upper 7 packers can be installed disconnectors (not shown in Fig. 1) mechanical or hydraulic principle of operation. The sub-centralizer (not shown in FIG. 1) can be installed below the upper packer 7. The lower packer 4 is axially mounted, the upper packer 7 is made with emphasis in the lower packer 4.

Funnel-centralizer 3 is designed to exclude damage to the geophysical instrument during research. The lower packer 4 serves to separate the lower 9 and upper 10 layers. The sub-centralizer 5 is designed for centering. The injection distribution device 6 is designed to distribute the total volume of injected water into the lower 9 and upper 10 layers. The upper packer 7 serves to protect the casing from injection pressure. The extension cord 8 is designed to compensate for changes in the length of the pipe string 2 during cyclic injection and thermobaric changes.

The injection distribution device 6 (Fig. 2), consisting of a casing 11 and an extractable 12 parts, is equipped with an upper autonomous pressure gauge 13, an average autonomous pressure gauge 14 and a lower autonomous pressure gauge 15. The upper 16 and lower 17 fittings are installed in the removable part 12 of the URZ 6 with the possibility of extracting both fittings 16, 17 in one round trip operation. The upper stand-alone pressure gauge 13 is installed above the upper fitting 16, the middle stand-alone pressure gauge 14 is installed under the upper fitting 16, the lower stand-alone pressure gauge 15 is installed under the lower fitting 17.

The implementation of the method is described in the description of the equipment.

Before the launch of the installation, the well 1 is modeled (Fig. 1) and the casing walls are cleaned with scrapers (scrapers) (not shown in Fig. 1), and then the wellbore is flushed 1. The installation is assembled in the following sequence: centralizer funnel 3, lower packer 4, a centralizer-sub 5, an injection distribution device 6, an upper packer 7, an extension cord 8. The unit is lowered either without an extractable part 12 of the URZ 6, or together with it. Packers 4, 7 are transferred to the working position, then the annular space is pressed over the lower 4 and upper 7 packers. Fluid is supplied to the pipe string 2. Measure the fluid injection pressure before and after the upper 16 and lower 17 fittings using the upper 13, middle 14 and lower 15 autonomous pressure gauges. In the process of injection, the pressure drop is fixed on the upper 16 and lower 17 fittings. Calculate the pressure drop in a known manner, the flow rate of the fluid injected into each reservoir. The actual fluid flow rates for formations 9, 10 are compared with predetermined values. If the actual costs differ from the set values, the extracted part 12 of the URZ 6 is raised together with the stand-alone pressure gauges 13, 14, 15 and fittings 16, 17 to the surface using a fishing tool on a geophysical cable, wire or coiled tubing (not shown in the figures). Replace the upper 16 and lower 17 fittings in the extracted part 12 of the URZ 6. Next, the extracted part 12 of the URZ 6 with autonomous manometers 13, 14, 15 and replaced by the upper 16 and lower 17 fittings in the pipe string 2 is lowered on a geophysical cable, wire or coiled tubing installation before it fits into the body part 11 of the URZ 6.

At the end of the work, the upper 7 and lower 4 packers are transferred to the transport position by tensioning the pipe string 2. A backwash is carried out to check the transfer of the 4.7 packers into the transport position and to clear the landing site of the packers 4, 7 from sand and sludge. They begin to lift the installation after the return of the sealing elements of the packers 4, 7 to a state that does not interfere with the rise.

The inventive method and installation for simultaneously separate injection of fluid into the reservoirs allows to obtain information about the injection pressure before and after each nozzle for a long period of time without using a large number of additional devices and without changing the injection mode, to obtain reliable data on the injection mode necessary for generating the correct mode of operation of the well, as well as improve the reliability of the technology.

Claims (4)

1. The method of simultaneous-separate injection of fluid into the reservoirs with the possibility of measuring the parameters of the injected fluid, including the descent into the well on the pipe string of the installation, consisting of a funnel-centralizer, lower packer, sub-centralizer, injection distribution device, upper packer, extension cord, installation of the lower and upper packers, crimping the annulus above the lower and upper packers, supplying fluid to the pipe string, determining fluid flow rates in the reservoirs, comparing the actual fluid flow rate for the reservoir stov with the given values, the rise when they differ, the extracted part of the injection distribution device to the surface using a fishing tool on a geophysical cable, wire or coiled tubing, installation in the seats of the extracted part of the injection distribution device of the upper and lower fittings, the descent of the extracted part of the injection distribution device into a pipe string on a geophysical cable, wire or coiled tubing installation before it is inserted into the housing of the injection distribution device, adjustable adjustable fluid injection, installation lifting at the end of work, characterized in that the injection distribution device is equipped with an upper autonomous pressure gauge installed above the upper nozzle, an average autonomous pressure gauge installed under the upper nozzle, and a lower autonomous pressure gauge installed under the lower nozzle, supply liquid into the pipe string, measure the pressure of the fluid injection before and after the upper and lower fittings using the upper, middle and lower autonomous pressure gauges, fix in during the injection process, the pressure drop across the upper and lower nozzles, the flow rate of the fluid pumped into each reservoir is calculated from the differential pressure, the actual fluid flow rate for the reservoirs is compared with the set values, if the actual flow rates differ from the set values, the extracted part of the injection distribution device is lifted together with autonomous pressure gauges and with fittings to the surface using a fishing tool on a geophysical cable, wire or coiled tubing, replace the extractable part of the device Injection distributions, the upper and lower fittings are lowered on a geophysical cable, wire or coiled tubing installation to extract the portion of the injection distribution device into the pipe string before it fits into the body of the injection distribution device, supply liquid to the pipe string and re-measure the pressure of the liquid injection before and after upper and lower fittings. 2. The method according to p. 1, characterized in that the installation above the lower and / or upper packer is equipped with a disconnector of a mechanical or hydraulic principle of operation. 3. The method according to claim 1, characterized in that a centralizer sub is installed under the upper packer. 4. Installation for simultaneous-separate injection of fluid into the reservoirs with the possibility of measuring the parameters of the injected fluid, including a funnel-centralizer, lower packer, sub-centralizer, injection distribution device, upper packer, extension cord, characterized in that the injection distribution device is equipped with a top stand-alone pressure gauge installed to the upper fitting, the middle stand-alone pressure gauge installed under the upper fitting, and the lower stand-alone pressure gauge installed under the lower fitting, with the upper and lower rd fittings accommodated in recoverable part injection distribution device to extract both nozzles per round trip operations.

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