RU151989U1 - DEVELOPMENT OF ORGANIC CHEMICAL REAGENT DISPENSER UNDER INDIVIDUAL PREPARATION OF THE PUMPED-IN FLUID IN A DELIVERY WELL - Google Patents

Abstract

1. The device of the wellhead dispenser for the supply of a chemical reagent for individual preparation of the injected fluid into the injection well, which includes a container for the chemical reagent, a metering pump with a reagent supply mechanism consisting of an electric drive and a reciprocating mechanism for the plunger, pipelines connecting the metering pump with capacity, electrical equipment, electrically connected to the reagent supply mechanism of the metering pump, characterized in that it further comprises: a control unit, connected Power reactant feed mechanism adapted to control the feeding mechanism reagent metering pump, depending on the calculated volume of chemical reagents needed for the formation of liquid injected into the well for a predetermined vremeni.2. The device according to claim 1, characterized in that the tank is equipped with a drain valve, as well as necks for installing a level sensor and for pouring the reagent into the tank. 3. The device according to claim 1, characterized in that it is additionally equipped with a visual level gauge mounted on the wall of the tank and connected to the tank through a ball valve and filter. The device according to claim 3, characterized in that the visual level gauge is made of steel and glass tubes, the first of which is equipped with a scale for visual control of the volume of the chemical reagent in the tank and a scale for monitoring the consumption of the reagent for a certain period of time.

Description

The utility model relates to the field of oil production, in particular, to compact units for the dosed supply of a chemical reagent into a well and can be used for small dosing volumes, for example, surfactants.

A known installation for the dosed supply of surfactants in oil reservoirs containing a heated chemical tank mounted on a common frame, an intermediate heating tank and a metering pump, which are connected in series with each other by pipelines with valves (see Auth. USSR certificate No. 827756 class E21B 43/00, 1979). At the same time, the capacity for the chemical reagent is heated by installing electric heaters in its cavity, which are placed in sealed chambers filled with a heat-resistant, explosion-proof liquid. This creates a safe working environment of the known installation when using explosive and fire hazardous reagents. However, this known installation is very cumbersome, designed to dispense large volumes of reagents. In addition, such a constructive implementation of the known installation, involves its use only in a relatively warm period of time, because at subzero temperatures, it is possible that the reagent freezes in pipelines connecting the tank to the metering pump.

A known installation for dispensing chemical reagents, including a chemical reagent tank heated by a heating system, a metering pump located in an airtight compartment, and a hydraulic system connecting piping the metering pump to the tank, while the sealed compartment with the metering pump is located inside the chemical tank reagent (see Aut. certificate of the USSR No. 926243, class E21B 43/00, from 1979). The known installation is also intended for large dosing volumes.

A mobile device for supplying reagents to a well is known, which is a cylindrical container with a coupling located in the lower part of the tank and used to connect to the nipple part of the annular valve of an oil well. On the upper part of the cylindrical container there is a pipe acting as a filler neck. The pipe is hermetically sealed with a plug, which is equipped with ears for ease of opening and closing. The cylindrical tank is equipped with a high pressure valve for overpressure relief and handles for carrying and installing a mobile device at the mouth of an oil producing well (RF patent 81761, class E21B 37/06).

The disadvantages of this device are the inability to automatically dispense small volumes of surfactants within a given time and according to a predetermined algorithm, for example, within the framework of an individual preparation system for injected fluid for cleaning the bottom-hole zone of an injection well formation.

A device is known for a wellhead hydrostatic dosing device (UDGD) comprising a cylindrical container with a pipe on the upper part acting as a filler neck, an additional calibrated container connected in the upper and lower parts to the annulus of the well through high pressure pipes through valves. In the lower part of the calibrated tank there is a fitting for dosed supply of the reagent. A constant dosed supply of reagent into the annulus of the well is carried out by equalizing the pressure in the annulus of the well and in a calibrated tank (RF patent 136080, class E21B 37/06, 07/11/2013).

A wellhead wellhead for supplying a chemical reagent to a well is known, including a chemical reagent tank, a metering pump located in the compartment, and a hydraulic system connecting piping the metering pump to the tank, characterized in that the block further comprises a cabinet, box or similar case with walls, a lid and doors, consisting of two compartments sealed relative to each other, in one of which there is a metering pump with a reagent supply mechanism, an electrical cabinet with electrical equipment, electrically connected to the specified mechanism for supplying the reagent of the metering pump, and a system for measuring the pressure of the supply of chemical reagent into the well, and in the second compartment there is a container for a chemical reagent equipped with a system for monitoring the presence of reagent in it and a hydraulics system connecting the capacity to the pump reagent by means of pipelines -dosing device, while the pressure measuring system is connected to the hydraulic system and to the reagent supply mechanism of the dosing pump (RF patent 64685, cl. E21B 43/00, 10.20.2006).

The disadvantage of these devices is the lack of automatic dosing and adjustable correction of small amounts of surfactants for a given time and according to a predetermined algorithm, for example, as part of a system for the individual preparation of injected fluid for cleaning the bottom-hole zone of the injection well

The objective of the utility model is to create a device for the dosed supply of a chemical reagent into a mixing tank to form an injected liquid, which has the ability to automatically dispense and adjust correction of small volumes of surfactants for a given time and according to a predetermined algorithm.

The technical result, which the proposed utility model aims to achieve, is to increase the accuracy and controllability of the dosing process of the chemical reagent when forming the injected fluid in the system of individual preparation of the injected fluid to clean the bottom-hole zone of the injection well formation.

The specified technical result is solved by the proposed device of the wellhead dispenser for supplying a chemical reagent for individual preparation of the injected fluid into the injection well, including a tank for a chemical reagent, a metering pump with a reagent supply mechanism, a hydraulic system that connects the metering pump to the tank through pipelines, electrical equipment, electrically connected to the reagent supply mechanism of the metering pump, characterized in that it further comprises

a control unit configured to control the reagent supply mechanism of the metering pump depending on the estimated volume of the chemical reagent required to form the fluid injected into the well for a predetermined time, and

a determination unit configured to determine the estimated volume of the chemical reagent depending on the daily volume of water injected and the coefficient of porosity of the formation, and the daily calculated volume of the chemical reagent does not exceed 1% of the daily volume of water injected and the set time is from 1 to 5 days.

In one preferred embodiment, the chemical reagent is a surfactant.

According to another preferred embodiment, the tank is equipped with a drain valve, as well as necks for installing a level sensor and for pouring the reagent into the tank.

According to another preferred embodiment, the device is equipped with a visual level gauge mounted on the wall of the tank and connected to the tank through a ball valve and filter. The visual level gauge is made of steel and glass tubes, the first of which is equipped with a scale for visual control of the volume of the chemical reagent in the tank and a scale for monitoring the reagent consumption for a certain period of time.

In FIG. 1 shows a General view of the device of the wellhead dispenser.

The proposed device wellhead dispenser for supplying a chemical reagent for individual preparation of the injected fluid into the injection well contains a tank 1 for a chemical reagent, a metering pump 2 with a reagent supply mechanism 3, consisting of a drive (hydraulic pusher) and a reciprocating mechanism of the plunger connected to electrical equipment 7, a hydraulics system 4 electrically connected to the reagent supply mechanism of the metering pump 4, connecting the tank 1 to the mechanism via pipelines 3 odachi reagent metering pump 2.

The device further comprises a control unit 5, supplying a control signal to the drive of the reagent supply mechanism 3 and providing for regulation of the dosed supply of the reagent depending on the estimated volume of the chemical reagent required to form the fluid injected into the well for a predetermined time, and a determination unit 6, configured to determine the estimated volume of the chemical reagent depending on the daily volume of water injection and the coefficient of porosity of the reservoir, and the daily estimated chemical reagent it does not exceed 1% of the daily amount of water injection and the predetermined time is from 1 to 5 days.

The main function of the level 8 sensor is to disable the metering pump 2 drive if the chemical level in the tank 1 decreases below the minimum acceptable level. The level sensor 8 consists of a float with a magnet that moves along the guide tube. There are two reed elements for supplying a signal to the control unit 5.

The control of the drive of the reagent feed mechanism 3 consists in controlling the frequency of movement of the hydraulic pusher rod and its operating time. The oscillating movement of the hydraulic pusher drives the plunger of the metering pump 2 and the chemical reagent is pumped into the hydraulic system 4 and then into the mixing tank to prepare the injected liquid.

The device is used, in particular, when organizing an individual preparation system for injected fluid for cleaning the bottom-hole zone of the injection well formation, which generally comprises a water conduit configured to supply water, a wellhead dispenser device configured to control the supply of surfactant volume, capacity, made with the possibility of receiving water and the volume of surfactant, and dissolving the accepted volume of surfactant in water to obtain akachivaemoy fluid pumps capable of pumping fluid obtained from a container in an injection well.

When stimulating the bottom-hole zone using the system of individual preparation of the injected fluid, the injected fluid should not have a harmful effect on the reservoir properties of the formation. Therefore, the following requirements are imposed on the injected fluids:

- the injected fluid must be chemically inert to the rocks that make up the reservoir, compatible with formation fluids and should exclude irreversible colmatation of the pores of the formation with solid particles.

- the injected liquid should not form stable water-oil emulsions of the first and second kind.

- the injected fluid must have a low corrosive effect on the downhole equipment. The corrosion rate of steel from its impact should not exceed 0.12 mm / year.

In this case, as the injection fluid for low-permeability terrigenous reservoirs, a fluid having the following composition is used:

- fresh water with at least 0.1% ML-81B or other surfactants with a density of 1000 kg / m ³ ;

- waste (technical) water with at least 0.1% ML-81B or other surfactants with a density of 1010-1050 kg / m ³ ;

- highly mineralized formation water with at least 0.1% ML-81B or other surfactants with a density of 1120-1180 kg / m ³ .

The injected fluid should have the following basic properties (cumulatively or selectively):

- be easily pumped through the pipe string, without creating additional pressure on the production string;

- have an adjustable dynamic viscosity in the range of 5-100 MPa-s;

- have an adjustable density in the range of 850-1200 kg / m ³ ;

- have structural and mechanical properties, in particular, static and dynamic shear stress;

- possess solvent or detergent properties with respect to commercial paraffin;

- Do not adversely affect the reservoir.

The use of detergent surfactants (ML-81, ML-81B, etc.) for washing the bottom-hole zone of a well is based on the surface-active properties of their polar molecules to selectively adsorb and orient themselves on the surfaces of the metal-pollution, oil-water, etc. e., at the same time, the phase and energy interactions at these boundaries change in a favorable direction, the “wedging” Rebinder effect is manifested, micelles (spatial aggregates of surfactants) solubilize water-insoluble substances. At the same time, washing solutions have a wetting ability, as well as important peptizing, antiresorption, demulsifying, foaming properties.

The main purpose of washing solutions for washing the bottom-hole zone is to remove viscous hydrocarbon-containing contaminants (oxidized oil, asphalt-resinous deposits, paraffin slurries and aggregates, oil emulsions, etc.) from the bottom-hole zone and the bottom of the well.

Preparation of injection fluid with the addition of a solution of ML-81B or other surfactants can be carried out on stationary units, in a measured capacity of a pumping unit of the CA-320 type or in a separate tank by gradual dosing of ML-81B or other surfactants into a circulating fluid flow according to the scheme: capacity pump capacity. A solution of ML-81B or other surfactants is prepared in two steps: dissolving ML-81B or other surfactants in fresh water (the calculated amount of surfactants is dissolved in a volume of 0.2 to 0.5 m ^{3 of} fresh water), and then this solution is gradually poured during circulation into the injected liquid. In winter, mixing of ML-81B or other surfactants must be done in warm (from 20 ° C to 50 ° C) water.

Claims (4)

1. The device of the wellhead dispenser for the supply of a chemical reagent for individual preparation of the injected fluid into the injection well, which includes a container for the chemical reagent, a metering pump with a reagent supply mechanism consisting of an electric drive and a reciprocating mechanism for the plunger, pipelines connecting the metering pump with a capacity, electrical equipment electrically connected to the reagent supply mechanism of the metering pump, characterized in that it further comprises: a control unit connected to an electric drive of the reagent supply mechanism, configured to control the reagent supply mechanism of the metering pump, depending on the estimated volume of the chemical reagent required to form the fluid injected into the well for a predetermined time. 2. The device according to p. 1, characterized in that the tank is equipped with a drain valve, as well as necks for installing a level sensor and for filling the reagent into the tank. 3. The device according to p. 1, characterized in that it is additionally equipped with a visual level gauge mounted on the wall of the tank and connected to the tank through a ball valve and filter. 4. The device according to p. 3, characterized in that the visual level gauge is made of steel and glass tubes, the first of which is equipped with a scale for visual control of the volume of the chemical reagent in the tank and a scale for controlling the consumption of the reagent for a certain period of time.

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