Method for preparing and pumping into well multi-component technological systems and plant for realization of said method

FIELD: oil and gas industry.

SUBSTANCE: method includes adjustment of pumping and dosing equipment on basis of amounts of components and their feeding time. Multi-component technological system is forced into well. Adjustment of pumping and dosing equipment is performed by means of frequency converters. Frequencies, set at frequency converter of forcing pump electric engine, at frequency converter of linker-feeding pump electric engine and at frequency converter of powdered polyacrylamide dosing pump electric engine are determined from mathematical formulae. Plant has drift dosage means for powdered polyacrylamide, drift dosage means for powdered components, two ejector mixers, mixing tank, forcing pump, linker tank. Electric engines of forcing pump, linker pump, first and second drift dosage devices are provided with frequency converters. First and second ejector mixers are provided with replaceable nozzles, with diameter 4.5-8.0 mm to provide for 150-250 m3/day plant productiveness.

EFFECT: higher precision.

2 cl, 2 dwg, 1 ex, 1 tbl

 

The invention relates to the oil and gas industry, and in particular to methods isolation of nonuniform permeability of the productive formation through the injection well multicomponent technology systems - solutions of polymers and a variety of emulsions.

It is known that for fields with heterogeneous permeability reservoirs with the presence of areas of absorption, high water-cut seams, cracks, channels, filtering, you must use the injection of a variety of insulating materials in certain technological sequence.

There is a method of isolation of nonuniform permeability of the productive formation [1], including the injection of consistently clay suspension with a density of 1.1 to 1.2 g/cm3to increase pressure injection up to 30-50% of the initial pressure at the constant speed of injection of the gel-forming composition of the cement slurry. The technological process is controlled by the injection pressure, without taking into account the physico-mechanical characteristics of a particular batch of bulk and individual settings, metering and pumping equipment.

The known method of isolation vodopodayuschih layers [2], which includes the injection of an aqueous solution of polyacrylamide, and then inject an aqueous solution of calcium chloride and aluminum sulfate, p is item after injection of each solution pumped fresh water, when polyacrylamide is used in a concentration of 0.1-0.2 wt.% and in the amount of 1.0-2.0 m3for every l/s coming into the well formation water. Supply in the well of the necessary quantity of the solution is pre-determined by the dependence of the performance of the pump from pressure, in accordance with which the process of injection. In this way the modulation of the pump is carried out stepwise, the pressure 1,5; 2,5; 3,5 MPa, which does not ensure accurate dosing. In addition, the batching of bulk components is carried out in terms, without taking into account the physico-mechanical characteristics of a particular batch of bulk and individual settings, metering and pumping equipment. Meanwhile, these characteristics though lie within the field of tolerance, however, have individual differences. Also different physico-mechanical parameters, such as bulk density in different batches of the same component. Furthermore, the method-prototype does not ensure accurate time of injection, which negatively affects the formation of the insulating layer on the walls of the borehole. Meanwhile, when carrying out insulation works heterogeneous permeability of the productive formation is one of the main requirements is the exact observance of the ratio of the injected components in to icestone expression, and in time, i.e. it is necessary to inject into the well a certain amount of each component in a certain sequence and at the agreed time. The quantity of the injected component may be a few tenths or even hundredths of a percent.

The problem to address with the inventive method, is ensuring the correct implementation of the plan of injection, i.e. the exact dosage of each component in both the number and time of injection with respect to physical and mechanical characteristics of a particular batch of injected components and hardware settings. Known installation for preparation and injection into an oil well multicomponent technological systems [3], which is chosen as the prototype for the method and device.

Installation-the prototype contains a hopper weighing system and screw feeder for polyacrylamide, the output of which is connected to the first input ejector mixer, a second input connected to the output of the dosing pump feed water tank for preparation of a solution associated with injection pump associated discharge pipeline from the oil well, the second weighing system with screw discharge, at least three storage capacity for other components associated with cm is relatively capacity, the output of which is connected to the input of the dispersant, the second input is connected with the outlet of the second ejector mixer, and the output from the injection pump, and the output capacity of the finisher is connected through a separate pump to the discharge pipe, which is further provided with a flow meter and pressure sensor.

The disadvantage of this system is that it does not provide fine dispensing system components, and provides the required flow rate of one or another granular component, by weight, not taking into account the specific parameters of the equipment, humidity and density of the components, in other words, is not provided for individual adjustment of equipment quantity injected into the well of each component, and time of injection. In addition, the installation of the prototype is not provided laminar flow regime of technological systems, especially at the outlet of the eductor mixers, which also reduces the accuracy of dosing.

The task, which directed the inventive installation is to provide a more accurate dosing of each component injected into the well of the technical system at the expense of the individual settings of the metering and pumping equipment, as well as the exclusion of turbulence in the flow at the outlet of the eductor mixers.

Put the second problem is solved by the method of preparation and injection into a well multicomponent technology systems, including setting the number of components and the time of their injection pump and dosing equipment - pressure pump, dosing pump, polyacrylamide, a pump for feeding staple - chromium acetate, auger feeder, the injection into the well multicomponent technology systems and the displacement of its water, according to the invention the configuration of the pumping and metering equipment are carried out by using frequency converters, with the frequency set to the frequency Converter motor injection pump, is determined from the ratio

where τ - industrial network frequency, Hz;

- maximum rated capacity of the pump, m3/h;

- hour capacity of the pump, m3/h;

where R is the total injected volume, m3;

t - duration of injection, hour,

the frequency set by the frequency Converter motor pump for feeding staple - acetate chromium () is determined from the ratio

wherehour pump capacity feeder finisher - chrome acetate, l/h;

μ - dimensionless shall oefficient, taking into account the performance of the pump stroke of the piston, choose from a range of 1-40,

where- consumption of staple - chromium acetate, m3;

t - time injection hour,

where R is the total injected volume, m3;

n - the percentage of the staple - chromium acetate,

the frequency set by the frequency Converter motor dosing pump granular polyacrylamide (with) is determined from the ratio

where- hourly capacity of the dosing pump granular polyacrylamide, m3/h;

K - coefficient taking into account the ratio of the reference bulk density of polyacrylamide, which is configured equipment to the actual density of the n-th party granular polyacrylamide, choose from a range of 0,5-2,0;

λ - the value of the mean square error of the experimental determination of the coefficient that takes into account the correlation between the performance of the screw feeder to the frequency of El. engine, choose from the range of 0.001 to 0.01;

η - to determine experimentally the coefficient that takes into account the correlation between the performance of the screw feeder to the frequency of El. engine, choose from a range 005-1,0:

wherethe flow of granular polyacrylamide, m3;

t - time injection of granular polyacrylamide, h;

where R is the total volume of the injection solution, m3;

m - the percentage of granular polyacrylamide.

Installation for preparation and injection into the well multicomponent technology systems contains the first screw feeder for granular polyacrylamide, the output of which is connected to the first input ejector mixer, a second input connected to the water supply line, and the output of the mixing vessel, the output of which is connected to the first input of the pressure pump, the output of which is connected with the bore, the second screw feeder for loose components, such as bentonite or wood flour, the output of which is connected with the second ejector mixer, the output of which is connected with the mixing vessel, the capacity for staple, the output of which is through a separate pump is connected with the second inlet of the pressure pump, the output of which is provided with a flow meter and pressure gauge. According to the invention the motor injection pump, the stapler of the first and second screw feeders are equipped with frequency converters and the first and second ejector mixers equipped with interchangeable nozzles diameter 45-8,0 mm to ensure the capacity of 150-250 m 3/day.

Figure 1 shows a diagram of the installation for preparation and injection into the well of multicomponent systems. Figure 2 shows a diagram of ejector mixer.

The inventive apparatus consists of two units - unit preparation of solutions 1 and pump unit 2. Block preparation of solutions 1 consists of two rooms - 3 technological and separated from him tight bulkhead carrier 4. In a technology room 3 unit preparation of solutions 1 are mixing 5 with a mechanical stirrer, equipped with a pressure gauge 6 and a level sensor 7, a container with a screw feeder for polyacrylamide 8, the motor connected to the frequency Converter 9, the ejector mixer 10 to obtain an aqueous solution of polyacrylamide, ejector mixer 11 to obtain the solution of bentonite or wood flour coming from the tank with a screw feeder 12, a motor connected to the frequency Converter 13. The eductor mixers 10 and 11 are connected by piping with screw feeders 8 and 12, respectively, and also with the source of water from the system reservoir pressure maintenance. The pipeline water supply is equipped with a control valve 14. The pump unit 2 consists of two areas - technology 15 and separated from him tight Perigord the th panel space 16. In the technological space 15 of the pump unit 2 is the capacity for staple 17, connected by pipeline with pump 18 with an external tank (not shown). The capacity for the stapler is equipped with a level sensor 19 and connected to the pipeline through a metering pump 20, a motor connected to the frequency Converter 21, to the first input of the pressure pump 22, a motor connected to the frequency Converter 23. The output of the pressure pump 22 is connected by a pipe equipped with a flow meter 24 and 25 gauge with well. Second input of the injection pump 22 is connected by a pipe with the outlet of the mixing vessel 5. For the successful operation of installation provides assistive technology and instrumentation elements, such as chokes, valves, cocks, valves, fire valve, pressure sensors, flow meters, etc. that are not shown.

The inventive installation is as follows.

First, make adjustment of the pumping and metering equipment. For this purpose, a frequency Converter 21 set the desired (calculated) frequency of operation of the pump 20, a frequency Converter 23 - pressure pump 22, frequency converters 9 and 13 - screw feeders 8 and 12, respectively. The setting is secondary devices (in our case, what ambarami, located in the operator room 4). All instrumentation is set to zero. Fill the hopper auger feeder 8 polyacrylamide, capacity for staple 17 by a pump 18 is filled with chromium acetate to the required level, which is controlled by the level sensor 19. When the equipment starts the flow of water from the system for maintaining reservoir pressure at the eductor mixer 10, which also comes from the dispenser 8 granular polyacrylamide. Coming out of the nozzle 27 ejector mixer 10, the components enter into the mixing tank 5, where the stirring and then the solution pump 26 is directed into the pressure pump 22. There also comes the finisher (chromium acetate) from the tank 17 by a pump 20. Download time which is set by the plan of operations is controlled by a timer (not shown) of the operator compartment. At the end of the injection process, a cross-linked polymer system disables all of the pumping and dosing equipment, in addition to the pressure pump 22, which is used to supply clean water to ensure produce previously uploaded polymer systems. If necessary, pump downhole fiber-dispersed systems based on bentonite or wood flour the work of the inventive installation is as follows. Make adjustment pressure on the OSA 22 frequency Converter 23, as explained above. The frequency Converter 13 tailor the operation screw feeder 12 for loose components (wood flour or bentonite). When powering equipment bulk component comes from the screw feeder 12 in the ejector mixer 11 where it is mixed with water and enters the tank 5, where it is mixed and with the help of the pump 26 is supplied to the injection pump 22. After injection of a single granular component (for example, wood flour) off screw feeder 12 and into the well fed pure water. Hopper screw feeder 12 is filled with bentonite is setting the dispenser onto the bentonite and after injection into the well water starts pumping into the well of a suspension of bentonite.

In the case of injection into the well of the polymer dispersion-filled systems installation works, as described above, as follows:

- pumping suspensions wood flour;

- water injection;

- injection of bentonite;

- water injection;

- injection of polyacrylamide and staple;

- pumping suspensions wood flour;

- water injection.

The inventive installation can successfully work on other technological systems in any order and combination.

The eductor mixers 10 and 11 are equipped with interchangeable nozzles 27, the diameter of which depends on the performance of the installation. So if p is poizvoditelnosti installation 150-200 m 3/d the diameter of the nozzle ejector mixer 11 is 4.5-6.0 mm, and a capacity of 200-250 m3/day - 6,0-8,0 mm For ejector mixer 10 when the capacity of 150-200 m3/day take the nozzle diameter of 4.5 - 6.0 mm, and a capacity of 200-250 m3/d - diameter of 6.0 to 8.0 mm Data according to the identified experimentally and lead to even further improve the accuracy of dosing, as to avoid turbulence in the flow at the outlet of the eductor mixer. Turbulization may occur due to the following factors, namely because the water supply is carried out from the Bush, the connection or disconnection of at least one branch leads to a surge of pressure in the water supply system, which is unacceptable in fine dosing. Installed on the pipeline water supply control valve 14 maintains a constant pressure and thereby prevents the disturbance of the flow. The perturbation flow also occurs when the discrepancy between the nozzle diameter and flow rate. With a large nozzle and a small flow also occurs perturbation of the stream.

A specific example of implementation of the method. The inventive method can be implemented with the injection of various technological systems, for example:

1) cross-linked polymer systems (e.g., polyacrylamide with chromium acetate);

2) fiber-dispersed systems (e.g., suspensions of clays the powder and wood flour);

3) solution of the polymer with the crosslinker and suspensions wood flour and other

Consider the example of the injection fiber-dispersed polymer systems. Tests were conducted on the South Agunsa field. Was specified work plan:

Using the formulas above, has calculated the correct values for the desired frequency for custom equipment.

Motor injection pump τN.N.=50 Hz.

For a pump for feeding staple (when plunger goes 8.0 mm)

1 cycle τC.=6 Hz; 2 cycle τC.=10 Hz; 3 cycle τC.=12,4 Hz.

For the first screw feeder (PAA)

1 cycle τPAA=5,9 Hz; 2 cycle τPAA=9.6 Hz; 3 cycle τPAA=12 Hz.

For the second screw feeder (wood flour)

1 cycle τDM=3 Hz; 2 cycle τDM=3.5 Hz; 3 cycle τDM=4.5 Hz.

Setting a second screw feeder on the bentonite is similar.

Everything needed to calculate the coefficients determined experimentally and their specific values are “know-how” of the applicant.

Calculated frequency values set by the secondary devices of the inverters of each motor. This job is done by the operator. After checking that the settings are correct and pumping equipment with clean water starts pumping technology systems in the CE is accordance with the work plan.

Sources of information taken into account

1. A.S. No. 1838586, publ. 30.08.1993, bull. No. 32.

2. A.S. No. 1838584, publ. 30.08.1993,

3. Certificate of utility model No. 25533 - the prototype for the method and device.

1. The method of preparation and injection into a well multicomponent technology systems, including setting the number of components and the time of their injection pump and dosing equipment - pressure pump, dosing pump, polyacrylamide, a pump for feeding staple - chromium acetate, auger feeder, the injection into the well multicomponent technology systems and the displacement of its water, characterized in that the configuration of the pumping and metering equipment are carried out by using frequency converters, with the frequency set to the frequency Converter motor injection pump () is determined from the ratio

where τ - industrial network frequency, Hz;

- hour capacity of the pump, m3/h;

- maximum rated capacity of the pump, m3/h;

where R is the total injected volume, m3;

t - duration of injection, h,

the frequency set by the frequency Converter motor pump for feeding staple - acetate chromium (), is determined from the ratio

wherehour pump capacity feeder finisher - chrome acetate, l/h;

- dimensionless coefficient that takes into account the performance of the pump stroke of the piston,

where- consumption of staple - chromium acetate, m3;

t - time injection, h,

where R is the total injected volume, m3;

n - the percentage of the staple - chromium acetate,

the frequency set by the frequency Converter motor pump - dispenser of granular polyacrylamide (with) is determined from the ratio

where- hourly capacity of the dosing pump granular polyacrylamide, m3/h;

K - coefficient taking into account the ratio of the reference bulk density of polyacrylamide, which is configured equipment to the actual density of the n-th party loose the poly is Alameda;

λ - the value of the mean square error of the experimental determination of the coefficient that takes into account the correlation between the performance of the screw feeder to the frequency elderates ;

- to determine experimentally the coefficient that takes into account the correlation between the performance of the screw feeder to the frequency of El. engine:

wherethe flow of granular polyacrylamide, m3;

t - time injection of granular polyacrylamide, h;

where R is the total volume of the injection solution, m3;

m - the percentage of granular polyacrylamide in accordance with the work plan.

2. Installation for preparation and injection into the well multicomponent technology systems containing the first screw feeder for granular polyacrylamide, the output of which is connected to the first input ejector mixer, a second input connected to the water supply line, and the output of the mixing vessel, the output of which is connected to the first input of the pressure pump, the output of which is connected with the bore, the second screw feeder for loose components, such as bentonite or wood flour, the output of which is connected with the second ejector mixer, the output of which the CSO is connected to the mixing tank, capacity for staple, the output of which is through a separate pump is connected with the second inlet of the pressure pump, the output of which is provided with a flow meter and pressure gauge, characterized in that the electric motors of the injection pump, the stapler of the first and second screw feeders are equipped with frequency converters and the first and second ejector mixers equipped with interchangeable nozzles with a diameter of 4.5-8.0 mm to ensure the capacity of 150-250 m3/day.



 

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8 ex, 2 tbl

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EFFECT: higher precision.

2 cl, 2 dwg, 1 ex, 1 tbl

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