Method of salt deposit prevention during oil production and transportation

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

 

The invention relates to the oil industry and can find application in the extraction and transport of oil, in particular when carrying out activities for the prevention of scaling in assorted collectors group metering stations.

There is a method of inhibiting the formation of salt deposits of sulfates of metals in the aquatic environment contained in subterranean oil-bearing formation or produced from it, including the injection of an aqueous solution of water-soluble polymer into a subterranean oil-bearing reservoir intervals, chosen in such a way as to ensure that these layers of water-soluble polymer in amounts effective to maintain inhibition of the precipitation (application for invention of the Russian Federation No. 97103419/03, publ. 1999.03.20).

The known method requires a large number of expensive water-soluble polymer, the effect of the application of the method occurs in a very long time saturation of the polymer layer.

There is a method of reducing the formation of deposits of mineral salts, in which the mixing of the composition with an aqueous saturated solution or liquid-precursor perform 2-4 stage either sequentially or in parallel, or simultaneously and sequentially and in parallel (application for invention of the Russian Federation No. 2002100909, publ. 2003.08.20 - prototype).

F the t from the known method comes directly in the application, however, the method requires the use of chemical reagents, the method is complex, multistage.

The invention solves the problem of simplifying the way by eliminating the use of chemical reagents and reduce mnogostadiinost process prevent scaling in the extraction and transport of oil.

The task is solved in that in the method of preventing scaling in the extraction and transportation of oil, including the mixing of flows of products produced and shipped, according to the invention for mixing select a compatible liquid, the liquid mixture is used in a quantity sufficient to reduce the concentration of salts to the value not more than the saturation concentration, when obtained after mixing of salinity, mixing of flows of liquids perform in the zone of the lack of technological equipment and pipes, covered inside with a release coating. Features of the invention are:

1) mixing of currents produced products;

2) transportation;

3) selection for mixing of compatible liquids;

4) selection of quantities of liquid for mixing sufficient to reduce the concentration of salts in the mixture of liquids to the concentration of saturation, when obtained after mixing mineralization;

5) mixing of flows of liquids in the area of technological equipment;

6) the same in Trou is Oh, interior coated with an antiadhesive coating.

Signs 1 and 2 are shared with the prototype, signs 3-6 are the salient features of the invention.

The invention

Cause salt deposits in the national collectors group metering stations in the oil industry is a mixture of incompatible formation water in the same pipeline. When mixing chemical reaction occurs with the formation of insoluble or slightly soluble in water chemical compounds, as a rule, barium sulfate or calcium sulfate. The mixing of the two water types leads to the formation of supersaturated salt solution and its precipitation in the form of sediment. Such water is called incompatible. By mixing compatible water is not formed supersaturated solution of salt and drop in the form of sediment possibly for other reasons, for example, lowering the temperature, the presence of centers of crystallization, flow rate, etc.

Existing methods of preventing scaling in the extraction and transport of oil based on the use of chemical compounds that prevent the precipitation of salts. However, these methods require a large number of expensive components, often multi-stage and complex.

In the proposed invention solves the problem of simplifying the way by eliminating the use of chemical reagents which reduce mnogostadiinost process prevent scaling in the extraction and transport of oil.

The task is solved in that in order to prevent scaling in the extraction and transport of oil by mixing streams of products produced pick up a compatible liquid, and the amount of liquid for mixing pick up sufficient to reduce the concentration of salts in mixtures of liquids up to concentrations not more than the concentration of supersaturation in the resulting salinity mixing. The fluid mixture is injected or in the main stream of process fluid salts or in any of the threads on the basis of technical and economic indicators. The mixing of flows of liquids perform in the zone of the lack of technological equipment and pipes, covered inside with a release coating. These excluded conditions create stagnant zones, with the centers of crystallization of salts and their precipitation. Next transported fluid group metering installation and further processing.

Examples of specific performance.

On the Romashkinskoye oil field carry out activities for the prevention of scaling in the extraction and transport of oil. Mined production wells are mixed in the pipeline and transported to group metering stations (GMS). Blending choose the compatible liquid, the liquid mixture is used in a quantity sufficient to reduce the concentration of salts to the value, not Bo is further than the saturation concentration, when obtained after mixing mineralization.

Example 1. In the pressure pipeline GMS-28 convey the fluid from the well # 5557 with the following parameters: flow rate - 26 m3/day, the water content of 65%, the content of VA - 0,301 g/l, Cl - 42,14 g/l, CA - 5,08 g/l, flow rate of the water - 16.9 m3/day. Before the offset analyze the compositions of other liquids from nearby wells. Install that from well # 5558 comes compatible fluid from the well 11206 - incompatible.

Compatible liquid. Well No. 5558. Flow rate - 18 m3/day, the water content is 99%, the content of VA - 0,163 g/l, Cl - 28,17 g/l, CA - of 3.56 g/l, flow rate of the water - 17.8 m3/day.

Incompatible liquid. Well No. 11206. Flow rate - 15 m3/day, the water content is 90%, the content of SO4- 0,62 g/l, Cl - 22,25 g/l, CA - 2.6 g/l, flow rate of the water - 13,5 m3/day.

Example 2. In the pressure pipeline GMS-26A convey the fluid from the well # 5551 with the following parameters: flow rate of 20 m3/day, the water content of 52%, the content of VA - 0,373 g/l, Cl - 80,9 g/l, CA - 10,97 g/l, flow rate of the water - 16.9 m3/day.

Before the offset analyze the compositions of other liquids from nearby wells. Install that from well # 21450 comes compatible fluid from the well 32618 - incompatible.

Compatible liquid. Well No. 21450. The flow rate is 16 m3/day, the water content is 99%, the content of VA - 0,365 g/l, Cl - 76.9 g/l, CA - of 11.45 g/l, flow rate of water to 15.8 m3/day.

Incompatible is idcast. Well # 32618. The flow rate is 21 m3/day, the water content of 55%, the content of SO4to 0.13 g/l, Cl - 94,61 g/l, CA - 12,66 g/l, flow rate of the water - 13,5 m3/day.

Example 3. In the pressure pipeline GMS-15 transport the fluid from the well # 12541 with the following parameters: flow rate - 26 m3/d water cut - 86%, the content of CA - 15 g/l, Cl - 80,9 g/l, flow rate of the water - 22,36 m3/day.

Before the offset analyze the compositions of other liquids from nearby wells. Install that from well # 20215 comes compatible fluid from the well 3256 - incompatible.

Compatible liquid. Well No. 20215. Flow rate - 18 m3/day, the water content is 99%, the content of CA - 11.4 g/l, Cl - 76.9 g/l, flow rate of the water - 17,82 m3/day.

Incompatible liquid. Well No. 3256. The flow rate is 21 m3/day, the water content of 75%, the content of SO4- 2.8 g/l, Cl - 94,61 g/l, CA - 1.66 g/l, flow rate of the water - of 15.75 m3/day.

Example 4. In the pressure pipeline GMS-32 transport the fluid from the well No. 9635 with the following parameters: flow rate - 36 m3/d water cut - 84%, the content of CA - 15 g/l, Cl - 80,8 g/l, Fe - 0,256 g/l, flow rate of the water - 30,24 m3/day.

Before the offset analyze the compositions of other liquids from nearby wells. Install that from well # 9640 comes compatible fluid from the well No. 9628 - incompatible.

Compatible liquid. Well No. 9640. The flow rate is 82 m3/day, the water content is 50%, the content of CA is 18.4 g/l, Cl - 113 g/l, Fe - 0,206 g/l, flow rate of the water - 41 m3/day.

Incompatible liquid. Well No. 9628. The flow rate is 35 m3/day, the water content of 70%, the content of H2S - 0,150 g/l, Cl - 25 g/l, CA - 6.6 g/l, flow rate of water is 24.5 m3/day.

The amount of liquid for mixing calculated as follows:

The dilution factors 5558:5557:11206 = 1,32:1,25:1 or in fractions of 0.37:0,35:0,28

1. Determine the concentration of VA:

0,37×0,163+0,35×0,301=0,165 g/l or 1,204 mEq.

2. Determine the concentration of sulfate:

0,28×0,62=0,173 g/l or 1,808 mEq.

Since CBa< CSO4calculation of conduct for barium.

Mineralization of the mixed water is close to 30 g/l for chloride. Find the maximum concentration supersaturation of 100 mg/l, the amount of released barium sulfate per liter of solution equal to 180 mg, which is 180 g/m3or when the total flow rate through the water 48,2 m3- 8,67 kg per day.

The mixing of flows of liquids in the area of lack of technological equipment and pipes, covered inside with a release coating, helps to avoid the growth of salt crystals on the technological equipment such as pumps, valves, pipe bends, etc.

For mixing flows of products produced pick up a compatible fluid. The fluid mixture is injected into the main stream of liquid salts. Mixing liquid flows the TEI perform on the straight pipe section in the zone of the lack of technological equipment and pipes, covered inside plastic anti-adhesive coating. Next transported fluid group metering installation and further processing.

As a result of activities on the job, no salt deposits in pipelines and process equipment. Failures of equipment and pipelines due to scaling completely absent.

The application of the proposed method will facilitate measures to prevent scaling in the extraction and transport of oil by eliminating the use of chemical reagents and reduce mnogostadiinost process.

The way to prevent scaling in the extraction and transportation of oil, including the mixing of flows of products produced and their transportation, characterized in that the mixing select a compatible liquid, the mixing of which is formed of a supersaturated solution of salt and drop in the form of sludge, the liquid mixture is used in a quantity sufficient to reduce the concentration of salts to the value not more than the saturation concentration, when obtained after mixing of salinity, mixing of flows of liquids perform in the zone of the lack of technological equipment and pipes, covered inside with a release coating.



 

Same patents:

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.

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 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 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 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: 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 field of the preparation of the products of oil wells and its division of oil, gas, and water with subsequent finishing components to marketable condition or to the requirements of in-field use

The invention relates to field of oil at the concentration of propane more than 2 wt.%

The invention relates to oil and gas industry and can be used on wells that are operated only by the fountain column, or wells, which are operated simultaneously by the fountain column and the annular space

The invention relates to systems of collection and preparation of oil and water emulsions

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: water treatment.

SUBSTANCE: invention relates to treatment of industrial and household waters, especially to separation of oil/water mixtures to remove coarsely dispersed and emulsified petroleum products therefrom. It is proposed to use styrene/divinylbenzene copolymer grains with fraction composition uniformity factor not higher than 1.6 as coalescent material to separated oil/water mixtures. In this case, price of material is lowered, oil/water separation efficiency is enhanced, and necessity of periodically washing material is omitted, whereas lifetime of material is prolonged, and efficiency temperature range is extended.

EFFECT: improved performance characteristics and reduced expenses.

2 dwg

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 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

The invention relates to the oil industry, in particular to installations for the collection and preparation of oil and water, and can be used to separate emulsions

The invention relates to apparatus for the separation of emulsions and can be used in oil and gas processing, oil and gas, petrochemical, chemical and other industries

The invention relates to techniques for the separation of immiscible liquids, in particular emulsified hydrocarbon media with a different type of emulsions in a wide range of water content, and can be used for deep dehydration of crude and trapping of oil, gas condensate and light oil products, liquefied hydrocarbon gases and other non-viscous hydrocarbon environments in oil and gas production and refining, chemical and other industries

The invention relates to the oil industry, in particular to a device for outputting an intermediate layer of horizontal pressure tanks at the oil treatment plants

The invention relates to the oil industry and can find application, for example, in the separation technology of production wells, which is lifted from the well in the form of a liquid hydrocarbon emulsions and, in particular, in the form of emulsion gazoochistnoe

The invention relates to the field of the oil industry and concerns the methods of collection, separation, oil treatment and recycling, disposal of oily sludge

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

Up!