Oil extractive device

FIELD: oil extractive industry.

SUBSTANCE: device includes exposure chamber, U-shaped branch pipe on it for passing of oil with picking of oil from upwards, made in form of five pipes inserted into one another with common ceiling and bottom and apertures in upper and lower portions of pipe, forming serially placed U-shaped and upturned U-shaped branch-pipe, and channel for passing of water with picking of water from downwards, having common output from device.

EFFECT: higher efficiency.

1 ex, 1 dwg

 

The invention relates to the oil industry and can find application in the field gathering systems, oil and gas fields with high water-cut production wells with separate feeding into the discharge line oil and water.

Known input device downhole pump containing two input pipe, the inputs of which are located at different levels, and their outputs are communicated through the connecting hose. To the last connected pipe, which is an additional channel (RF Patent No. 2123613, CL F 04 47/00, publ. 1998.12.20).

This solution allows to provide a clear transition from pumping water pumping oil with a small production wells.

Closest to the invention to the technical essence is a device for extraction of oil, including settling chamber, located inside the U-shaped pipe for the passage of oil from the fence oil on top and a channel for passage of water from the water intake at the bottom, having a common exit device (Patent RF №2117138, CL E 21 In 43/00, publ. 1998.08.10 - prototype).

The known device allows for the separation of oil-water emulsion into oil and water, to separate the solids, however, the performance of the device remains low.

The invention solves the problem of providing for the separation of oil-water emulsion into oil and water during the high flow rate wells.

The task is solved in that the device for oil production, including settling chamber, located inside the U-shaped pipe for the passage of oil from the fence oil on top and a channel for passage of water from the water intake at the bottom, with the total yield of the device according to the invention the U-shaped pipe for the passage of oil made in the form of five nested one inside the other pipe with a common roof and bottom and a hole at the top or bottom of the pipe, forming sequentially positioned U-shaped and inverted U-shaped pipe.

Features of the invention are:

1. settling chamber;

2. U-shaped pipe for the passage of oil from the intake of oil from above;

3. a channel for passage of water withdrawal of water from below;

4. the overall yield of the device.

5. U-shaped pipe for the passage of oil in the form of five nested one inside the other pipe;

6. same with a common roof and a bottom;

7. same with the holes at the top or bottom of the pipe, forming sequentially positioned U-shaped and inverted U-shaped pipe.

Signs 1-4 are common with the prototype, signs 5-7 are the salient features of the invention.

The invention

In the extraction of oil cut has to be split and transported separately fractions of oil and water. Known devices allow you to apply for pumping separated fractions when the whole is but a small flow rates of producing wells. At higher flow rates, the known devices do not provide a separate supply of oil and water. Separated phases have very small volume and easily mixed in the piping with the formation of the oil emulsion. In the proposed device solves the problem of providing for the separation of oil-water emulsion into oil and water at high flow rate. The task is solved by a device for extraction of oil, represented in the drawing.

Device for extraction of oil includes a settling chamber 1, five nested one inside the other pipe 2-6 with a total roof 7 and the bottom 8 and the holes in the top 9 or below 10 tubes forming sequentially positioned U-shaped and inverted U-shaped pipe, and a channel for passage of water 11 water bottom 12. Pipe 2-6 and a channel for passage of water 11 have a common output 13 of the settling chamber 1.

The device operates as follows.

The device fits in the mouth of the oil wells. The oil emulsion from the oil wells is sent to a settling chamber 1. In the settling chamber 1 under the action of gravitational forces stratify oil emulsion into oil and water. Water as a liquid of greater density takes the lower position. The accumulation of oil as the liquid of lesser density occurs in the upper part. The interface oil-water for the accumulation of oil is reduced to the level of the fence the water 12 of the channel for passage of water 11. Upon reaching the boundary between the oil-water level water intake 12, a sudden displacement of water by oil from the pipe 2 through 6 in the output 13 of the settling chamber 1. Through holes 9 and 10 oil fill pipe 2-6 and further displaced from the settling chamber 1 through the holes 9 and 10 and pipe 2-6 to the output 13 of the settling chamber 1. The interface oil - water as the displacement of oil rises to the level of the holes 9. Upon reaching the boundary between the oil-water level of the hole 9, a sudden displacement of oil by water from the pipe 2 through 6 in the output 13 of the settling chamber 1. Through holes 9 and 10, the water fills the pipe 2-6 and in the future remains in the pipes 2-6. Water is displaced from the settling chamber 1 through the withdrawal of water from the bottom 12 and the channel for passage of water 11. The interface oil - water for the accumulation of oil is reduced to the level of water 12 channel for passage of water 11. Upon reaching the boundary between the oil-water level water intake 12 the cycle repeats.

The device regulates consistent flow in the pipeline the oil, the water, which ensures the absence of formation of oil-water emulsion.

The ability to use the device as a locking device for fluid flow is determined by the ratio between the flow rate, viscosity and density of the downhole fluid and structural features.

The intermediate tubes 3, 4, 5 have holes, the RA is required so that allow you to change the direction of flow on the opposite. Optimal for achieving the task is fourfold change the direction of flow, which is achieved by five tubes, as in the proposed design. Each pair of pipes works as a siphon, and they are connected in series.

Theoretical substantiation of possibility of the operation of the device

The ability to use the device as a locking device for fluid flow is determined by the ratio between the pressure created at 1 m height liquids of different density in his knees, and losses on the hydraulic friction at 4 m port siphon (the length of the channel is multiplied by 4, since 1 m height of the siphon corresponds to 4 m of the path of the fluid in four knees). Therefore, there must be a certain ratio between the flow rate, viscosity and density of the downhole fluid and the dimensions of the construction of the device, after which it will be working.

The hydrostatic pressure drop in the channels of the siphon, per 1 m height, ΔR is determined by the formula:

where g is the acceleration of gravity;

ρin- density oil-water mixture;

ρnthe density of oil.

Consider the flow of oil through the annular channels of the device. Tothis case the average flow rate at a constant flow rate Q is determined by the formula:

where DNR- internal diameter of pipe, m (5th trumpet),

ddrug- the outer diameter of the inner pipe, m. (1st trumpet).

The pressure drop per 1 m of the annular space ΔPTrdue to hydraulic friction is determined by the formula:

where

the hydraulic resistance coefficient for a Newtonian fluid in laminar flow regime,

Re is the Reynolds number for the flow in the annular channels

μn- viscosity oil (aerated oil to the pump intake).

The formulation of the well production rate in the expression for the Reynolds number shows that the current in the device channels is laminar, which allows you to apply formula (4) for the coefficient of hydraulic resistance.

Substituting (5) and (2) to (4), we obtain

Substituting (6) into (4), we obtain

Equating (1) and multiply by 4 the value of (7), we have:

where

Multiply by 4 ΔPTrdue to the fact that the liquid passes through four knee device.

Specific example

At the wellhead is placed before the its device. Through the downhole pump to provide the water-cut oil production. Properties of products produced the following:

Well flow rate - 2.5 m3/day.

The cut - 81,78%.

Time of sludge on 10°With no added reagent to 4 hours.

The density of water -1,11 g/cm3.

The density of oil - 0,922 g/cm3(there is a high content of residual water by settling without reagent).

The viscosity of the oil - 0,0416 PA·C.

From manifolding line water-in-oil goes in the settling chamber 1. In the settling chamber 1 is divided water-cut oil into oil and water. Through pipe 2 to 6 and a channel for passage of water 11 is provided by a separate flow in the discharge line oil and water.

According to calculations by the formula (9) Qmax=6,9176 (m3/day), significantly greater flow rate of 2.5 m3/day.

The time of the separation of products produced oil and water, the maximum throughput of the device exceed the actual flow rate that provides a guaranteed flow in the discharge pipe the oil, then water to prevent the formation of high-viscosity emulsion.

Application of the proposed device will allow for the separation of oil-water emulsion into oil and water at high flow rate wells.

Device for extraction of oil, including settling Cham is ru, located inside the U-shaped pipe for the passage of oil from the fence oil on top and a channel for passage of water from the water intake at the bottom, with the total output of the device, characterized in that the U-shaped pipe for the passage of oil made in the form of five nested one inside the other pipe with a common roof and bottom and a hole at the top or bottom of the pipe, forming sequentially positioned U-shaped and inverted U-shaped pipe.



 

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FIELD: oil extractive industry.

SUBSTANCE: device includes exposure chamber, U-shaped branch pipe on it for passing of oil with picking of oil from upwards, made in form of five pipes inserted into one another with common ceiling and bottom and apertures in upper and lower portions of pipe, forming serially placed U-shaped and upturned U-shaped branch-pipe, and channel for passing of water with picking of water from downwards, having common output from device.

EFFECT: higher efficiency.

1 ex, 1 dwg

FIELD: oil and gas production.

SUBSTANCE: invention relates to gas-liquid systems coming from oil production wells. Mixture is separated into liquid and gas in separator. Liquid is periodically accumulated in separator container and then displaced with gas. During this operation, differential pressure for liquid reaching its lower and upper recorded levels and time required for filling recorded volumes are measured as well as absolute pressure and temperature of gas in container. Liquid flow value expressed in weight is calculated using special mathematical dependence. At oil field, liquid and gas enter separator from preliminary gas intake installation or from the first separation step.

EFFECT: increased accuracy of measurement due to avoided gas density registration and excluded necessity of using strictly cylindrically-shaped measuring container.

1 dwg

FIELD: oil extractive industry.

SUBSTANCE: mixture is separated on liquid and gas in separator. Liquid is periodically collected and forced away by gas while measuring absolute pressure and gas temperature in separator tank near upper and lower fixed liquid levels, and times of forcing away of fixed liquid volume. Additionally measured are absolute pressure and temperature in moment when liquid reaches intermediate fixed level. Then liquid is forced from intermediate fixed level to lower fixed level separator is switched off from well, and mass loss of gas is calculated from provided relation. Device for realization of method consists of separator with feeding pipe, in which a three-drive valve is mounted, and draining pipe, which through said valve is connected to liquid outlet channel and to gas outlet channel. Separator is provided with sensors of temperature and pressure and sensors of upper, intermediate and lower levels, mounted in such a manner, that they separate fixed volumes between each other in separator tank, in case of equality of which calculations are simplified.

EFFECT: higher precision.

2 cl, 1 dwg

FIELD: oil industry.

SUBSTANCE: method includes mixing water-oil emulsion with drain water in line of inlet of first electric hydrator by dispersing drain water in volume 8-15% from volume of prepared oil at temperature 40-50°C. As washing water drain water is used from same oil deposit with mineralization less than saturation limit.

EFFECT: higher efficiency.

1 ex

FIELD: oil industry.

SUBSTANCE: method includes feeding oil emulsion to reservoir with flow 0,5-1 m3/hour through layer of drain water of same oil deposit with mineralization less than saturation limit at temperature 20-30°C and bed thickness of drain water 6-8 m. in reservoir oil is separated and directed to inlet of oil preparation plant.

EFFECT: higher efficiency, broader functional capabilities.

1 ex

FIELD: oil industry.

SUBSTANCE: method includes dispersing water in oil emulsion at input of accumulator. As water, drain-water of the same oil deposit is used with content of oil products no less than 60 mg/l and hard suspended particles no more than 50 mg/l in volume 8-15% of volume of prepared oil at a temperature 5-25°.

EFFECT: higher efficiency.

1 ex

FIELD: oil industry, particularly to prevent salt deposits in collector and measuring installations during oil production and transportation.

SUBSTANCE: method involves mixing product flows and transporting thereof, wherein compatible liquids are chosen for further mixing so that during mixing of above liquids oversaturated salt solution does not appear to prevent salt precipitation. Liquid for mixing is taken in amount enough to reduce salt concentration to value, which does not exceed saturated concentration and provides mineralization obtaining after liquid mixing. Mixing of liquid flows is performed out of process equipment and in tubes provided with release coating applied on inner tube surfaces.

EFFECT: increased simplicity due to elimination of chemical reagent usage and due to reduced number of stages.

4 ex

FIELD: oil production industry, particularly for oil product separation.

SUBSTANCE: method involves mixing gaseous hydrocarbon with aqueous acid solution with pH value of not more than 4 so that hydrate-generation gas is converted into hydrate phase under hydrate phase forming control.

EFFECT: increased efficiency due to increased separation degree, increased simplicity, possibility to utilize separation products and enhanced safety.

15 cl, 2 dwg

FIELD: oil production, oil refining, oil chemistry and other fields connected with emulsion breakdown, particularly adapted for formation fluid separation into such components as oil, gas and water.

SUBSTANCE: method involves subjecting formation fluid flow to magnetic treatment to provide emulsified water droplet coalescence; breaking inhibiting shells at oil-water interface to provide additional water droplet collision. To increase rate of water-gas-oil emulsion stratification, to improve quality of emulsion separation into oil, gas and water and to reduce emulsifier consumption above magnetic treatment is carried out in field directed transversely to fluid flow and having strength H = 5-10kA/m and magnetic field strength gradient dH/dr=2-5·106 A/m2. Unidirectional unipolar point constant magnets are used for above magnetic field creation. Inhibiting shells are broken with the use of vibration having 10-100 Hz frequency and 0.5-10 mm amplitude.

EFFECT: increased emulsion breakdown rate along with decreased hydrocarbon concentration in water and water content in hydrocarbon, as well as reduced demulsifier consumption.

1 tbl, 2 dwg

FIELD: water production from boreholes.

SUBSTANCE: method involves drilling production and injection borehole systems; penetrating borehole by perforation thereof; applying vibroacoustic pressure oscillations to formation, wherein the pressure oscillations are excited by acoustic borehole tools lowered in boreholes; producing water from boreholes. Injection borehole pipes are not perforated and are filled with working liquid. Acoustic oscillations are initially applied to production boreholes so that pressure in production boreholes preliminarily filled with fracturing liquid should be at least 2 times greater than formation breakdown pressure. Acoustic borehole device is located within perforation area. After crack opening water is lifted from production boreholes. During water lifting acoustic pressure oscillations are applied to formation through injection boreholes.

EFFECT: provision of water production in dry territories, increased economy and efficiency.

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