Method for even supply of liquid reagent into well

FIELD: oil and gas production.

SUBSTANCE: invention relates to oil producing industry, in particular to delivery of reagent into well and its supply into flow of bed fluid for prevention of corrosion, deposition of salts and paraffins in depth pump equipment. Method includes energising dosing pump and pumping of reagent from storage tank via feeder into well. Dosing pump is energised either from autonomous source arranged below or inside submersible electric motor (SEM) or by means of power takeoff from shaft of SEM or from coil additionally installed in SEM stator or from surface along cable. Liquid reagent is supplied to inlet of electric centrifugal pump set (ECPS). Reservoir for storage of reagent and dosing pump are fixed on ECPS below SEM. Reservoir has at least two holes, one of which is intended for supply of reagent into well, the other one - to pump bed fluid inside reservoir.

EFFECT: reduced consumption of reagent and increased overhaul period of wells operation due to even and efficient withdrawal of reagent into well.

 

The invention relates to the oil industry, in particular to the delivery of the reagent into the well and flow into the formation fluid flow to prevent corrosion, deposition of salts and paraffin for deep well pumping equipment.

The known method, uniform supply (RF patent No. 2258805, MKI EV 47/10, 2005) fluid chemicals into the well, consisting of equipment well before its commissioning system of injection of chemical reagents, which contains a reservoir for storage of reagents and device with electric control for injection of chemicals into the tubing string, and supply energy to the discharge device through and along the pipeline system.

The disadvantages of this method include prohibitively high for the majority of wells capital cost of equipping their devices and systems used in this method, difficulties in maintenance and repair of these systems.

A known method of supplying chemicals to accept installation of electrical submersible pump (ESP), consisting of placing in the bottom of the installation of a tank for storage of solid or encapsulated chemical reagents and supply of this chemical to the ESP using the processes of dissolution of reagents and hydrodynamic removal of solution from the reservoir due to the energy flow of the reservoir fluid, washer installation (see, for example, patent RF №2227206, EV 37/06, 2004).

The disadvantages of this method are uneven supply of reagents to the input of the installation, due to the fact that as the consumption of the reagent decreases its concentration in the carry out from the container of liquid.

A known method of supplying chemicals to accept installation of electrical submersible pump (ESP), consisting of placing in the bottom of the installation of a tank for storing a liquid reagent and supply of this reagent on the pump intake with the use of ejection process due to the energy of formation fluid flow passing through the ESP (see, for example, patent RF №2135743, EV 37/06, 1999).

The design used in this way, complex, does not create a steady supply of chemical reagent, as the supply of ejector pump depends on the size of the main thread, and the ratio in its phases: water-oil-gas, and the density and viscosity of the produced fluid.

In addition, the injection scheme requires the corresponding pressure drop, which is highly undesirable at the entrance ESP.

Closest to the claimed method is a uniform flow of the liquid reagent into the well at the entrance of electrical submersible pump (ESP), consisting of placing at the wellhead capacity for storage and reagent dosing pump volumetric steps,the supply of network energy to the pump-dispenser, sampling of the capacity of the reagent and submit it either in the annular space and then to the input of ESP, or capillary tube, and then also on the receiving ESP. When released from the reagent within the container takes the air (see, for example, patent RF №2260677, EV 41/02, 2005).

The disadvantages of the method for the first variant is that, despite the uniform flow of the reagent into the annulus at the pump intake uniformity is missing due to fluctuations of the dynamic level and the formation of foam in the annulus. In practice, this leads to a significant waste of the reagent in excess. Otherwise, the salt will fall in the pump. In the second embodiment, when the supply of reagent in the capillary tube are complicated tripping, lifting, increases the price of the system. In addition, any implementation of this method devices located below the pump intake, for example, submersible motor (SEM) and filters, which is adhered to the pad, do not fall into the zone of action of the reagent, which leads, for example, to their fouling salts with subsequent failure. There is no possibility of these ways to deliver the reagent and the area of perforation. Under the existing dimensions of the equipment capillary tube does not pass between the pad and the casing string.

The present invention is the establishment of a well is about and economical method of supplying reagent to the area of the casing, below ESP.

This technical result is achieved in that in the way that a uniform flow of the liquid reagent in the well, including the power supply for the pump and pumping the reagent from the storage tank through the dispenser into the well, according to the invention the power supply for the pump are carried out either from an independent source, below or inside a submersible electric motor, either through a PTO shaft with a submersible electric motor or additionally installed in the stator submersible motor coil, or from the surface of the cable, the storage capacity of the reagent and the pump is fixed to the ECP below the pad, with the capacity to store reagent perform at least with two holes, one of which is intended for pumping into the well, and the other for pumping formation fluid into the vessel, and the liquid reagent serves on the ESP intake.

The placement of the discharge orifice and the metering device below the ESP allows you to evenly distribute the reagent as in the volume of reservoir fluid in the area of installation and to ensure a stable concentration over time, which protects all elements of the ESP from the effects of harmful factors.

The method of injection is carried out as follows. The reagent is placed in the vessel, have her two holes: one for pumping into the well, another to enter the reservoir fluid. Tank with pump-dispenser mounted on the lower pad and down into the well. When connecting power the pump generates the movement of the reagent inside the tank and organizing the reagent in the produced fluid. Variation of performance of the pump can adjust the feed rate of the reagent in the produced fluid. Structurally, the energy supply can be solved in different ways. Energy can be transmitted from the shaft upstream of the pad. Alternatively, the Pad may be additional coil, which can also be fed by the dosing pump. In addition, power can be fed from the wellhead via cable or from Autonomous submersible source, below or inside the pad.

When connected to the outlet capacity of the capillary tube method allows you to apply the reagent to the area of the wells located significantly below the suspension ESP, for example in the area of perforation.

The method can be used to supply a wide class of liquid reagents: foaming agents, corrosion inhibitors, surfactants for improving the flow characteristics of the well fluid, paraffin solvents to prevent deposition of solid particles on the elements of ESP and tubing column.

With the royals uniform flow of the liquid reagent into the well, including the power supply for the pump and pumping the reagent from the storage tank through the dispenser into the borehole, characterized in that the power supply for the pump are carried out either from an independent source, below or inside a submersible electric motor, either through a PTO shaft with a submersible electric motor or additionally installed in the stator submersible motor coil, or from the surface of the cable, the storage capacity of the reagent and the pump is fixed on the installation of electrical submersible pump below the submersible motor, the storage capacity of the reagent is performed, at least two holes, one of which is intended for pumping into the well, and the other for pumping formation fluid into the vessel, and the liquid reagent serves as input to the centrifugal pump.



 

Same patents:

FIELD: oil and gas production.

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3 cl, 3 dwg

FIELD: oil and gas production.

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2 cl

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3 dwg

FIELD: oil and gas production.

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1 ex, 1 tbl

FIELD: physics.

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20 cl, 2 dwg

FIELD: oil and gas industry.

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3 cl, 1 dwg

FIELD: oil and gas industry.

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2 cl, 7 dwg

FIELD: oil-and-gas industry.

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4 dwg

FIELD: oil-and-gas production.

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2 cl, 1 dwg

FIELD: oil-and-gas production.

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4 cl, 1 dwg

FIELD: oil and gas industry.

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3 cl, 2 dwg

FIELD: oil and gas production.

SUBSTANCE: invention refers oil and gas industry and can be implemented at cleaning bottomhole zone of pressure well. The essence of the invention is as follows: according to the method solution of surface active substance in fresh water is pumped into annular space of the well in volume of 4-6 m3. When flow string is shut off at the well head, anti-corrosion fluid is being pumped after the solution of surface active substance into annular space of the well during 3-6 minutes up to achieving maximum pressure of pumping, but not above maximum admissible pressure to the production string. Pumping of anti-corrosion fluid is stopped, annular space is shut off at the well head, the flow string is opened at the well head, and flow out is being carried out via the flow string during 3-6 minutes. Further the flow string is shut off at the well head and operations of pumping anti-corrosion fluid and blow out are repeated 3-6 times. When the flow string is shut off at the well head, annular space of the well is completely filled with anti-corrosion fluid, then annular space at the well head is shut off, the flow string is opened and flow out is performed via the flow string till clean water appears; the well is started-up.

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3 ex

FIELD: oil and gas industry.

SUBSTANCE: group of inventions refers to oil industry, and namely to systems intended for magnetic processing of formation fluid of various watercut in the well. System includes the device used for magnetic processing of flow-through fluid with a tube through which the produced fluid flow flows, and a magnetic block which is enclosed in a tight housing and installed on the tube. Device is located below the submersible electric motor and made as connected thereto by means of a connection as a perforated branch pipe. On the one end, the latter is connected to submersible electric motor, and on the other end - to the tube of the above device. According to the first version, the opposite tube end located at a distance from the branch pipe is equipped with a disk-shaped centralising interlocking device, and diameter of its cross section approximately corresponds to diameter of the well casing. According to the second version, the branch pipe is enclosed in a tight housing-screen with its simultaneous covering the submersible electric motor and partial covering the above casing.

EFFECT: improving efficiency of protection against deposits at any watercut of the produced fluid.

14 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil production. The device includes the lengthy protector made as the long-length stout cylinder with the installed inside core rod which has the output from protector at the side of its contact with the bottomhole equipment. The core rod has the supplemental output from the protector, opposite to the first output. The supplemental output is lengthy, bent towards the bottomhole equipment, placed lengthwise the protector and the bottomhole equipment to its upper part. The both core rod output zones adjacent to the protector are provided with lagging.

EFFECT: increased efficiency of protecting oil recovery equipment and ensured explosion and fire safety.

5 cl, 1 dgw, 1 tbl

FIELD: technological processes; measurement.

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EFFECT: receipt of accelerated method for cement stone corrosion detection.

6 cl

FIELD: oil industry.

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EFFECT: effectiveness improvement of oil lifting in complex geological-and-technical conditions, deviated wells and while intense hydroparaffine deposits.

1 dwg

FIELD: oil production industry, particularly operation of pipelines included in oil collection and reservoir pressure maintenance system.

SUBSTANCE: method involves mounting device on pipeline convergence point plate; arranging drainage unit at pipeline convergence point; arranging anode beds from opposite pipeline way sides; electrically linking pipeline convergence point with pipelines; performing test cathodic protection switching-on; setting protective current value providing necessary length of zone to be protected; grouping pipelines to be protected according to protective current value; setting particular protective current for each pipeline group; calculating distance from anode bed to pipeline to be protected in dependence of value of protective current running off anode bed.

EFFECT: increased corrosion protection of pipelines.

4 tbl

FIELD: oil and gas production, particularly for metered corrosion inhibitor, paraffin and salt accumulation inhibitor, as well as demulsifying agent injection in oil well.

SUBSTANCE: method involves performing periodic regent supply in hole annuity of well with the use of proportioning pump. In the case of underground repair of sticky well supply cable of centrifugal pump electric motor is substituted for cable with capillary pipe. The cable with capillary pipe is connected to flow string and is lowered in well. Chemical reagent is injected in well via the capillary pipe to downhole pump inlet or within perforation interval of the well. To provide chemical reagent supply capillary pipe end is connected with polyethylene capillary pipe having design length with the use of connection nipple provided with weighting jet.

EFFECT: provision of guaranteed reagent supply to pump inlet or within well perforation interval, possibility to change class of reagent to be supplied in well and amount of reagent in dependence of well operation parameters.

1 dwg

FIELD: oil and gas extractive industry, possible use during operation of wells with anti-corrosive liquid in inter-tubular space, during control of pressurization of cased wells, during control of integrity of anti-corrosive liquid in force wells.

SUBSTANCE: in accordance to method, working agent is forced in, mouth pressure is measured, pressure in inter-tubular space is measured and well parameters are determined. Working agent flow at well mouth is measured. As parameter being measured, volume of anti-corrosive liquid in inter-tubular space is selected, which is computed using analytical formula. Also determined from analytical formula are pressure losses during passage of working agent through well column.

EFFECT: preservation of well operation mode and simplification of measurements, possible determining of volume of anti-corrosive liquid present at current moment in inter-tubular well space.

1 ex

FIELD: oil production industry, particularly to supply chemical reagents into well or pipeline.

SUBSTANCE: method involves connecting pressure source, namely gas, and chemical reagent vessel with object to be treated; injecting chemical reagent into the object without shutdown thereof or performing technological pause and bringing the object into operation. Hole annuity or land-based pipeline are used as the object to be treated. Pressure source is hole annuity of production well. Gas is accumulated in above hole annuity by closing gate valve of wellhead fittings, which result in pressure increase up to value exceeding that in well to be treated or in pipeline for not less than 0.2 MPa.

EFFECT: increased efficiency of chemical reagent injection into object to be treated.

2 ex, 2 dwg

FIELD: oil and gas production.

SUBSTANCE: group of inventions relates to oil industry, in particular may be used to supply inhibitor of salt deposits onto surface of submersible electric motors and input of electric centrifugal pumps. Method includes arrangement of inhibitor in cylindrical vessel with channels in upper part of body, lowering vessel into well, dilution of inhibitor, its withdrawal from vessel. Inhibitor is mixed with viscous matrix substance to form hydrophobic thermoplastic mix, density of which exceeds density of bed fluid. After lowering of vessel into well, mixture is heated up to ambient temperature. After heating mixture is taken out of vessel via dosing hole under action of terrestrial gravitational field. Mixture is diluted in working chamber by diffusion method with further transfer of diluted inhibitor into bed fluid. Working chamber is installed below cylindrical vessel, and vortex motion of bed fluid is arranged inside.

EFFECT: increased efficiency of inhibitor supply process.

5 cl, 1 dwg

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