Method of destruction of oil-water trap emulsion

 

(57) Abstract:

The invention can be used in the field of oil and gas production. The method involves mixing the emulsion with a composition, the influence of the wave field and the subsequent sucks. The mixing produced by separate and consecutive to each other feed components in the emulsion, after which the influence of the wave field on the aqueous phase mode electro influence in the generation of a spectrum of frequencies from 200 kHz to the frequency of infrared radiation by its circulation through the electro-emitter back to the area of the aqueous phase. As a composition using the composition containing the reagent on the basis of alkylsulfonate, demulsifier based on a mixture of anionic and nonionic surfactants containing a sulfonic acid based on the sodium alkylbenzenesulfonate, and the reagent on the basis of nitrilotriethanol acid. The technical result consists in increasing the depth and speed of destruction of the emulsion. table 1.

The invention relates to the field of nefteothodov, in particular to the technology of destruction and dehydration of oil-water emulsions.

The main source of the emergence of trap oil in the oil treatment plants are so called who are persistent emulsion layers, consisting of globules of water with intact stable membranes and mechanical impurities. The greatest number of them formed during the preparation of the oil with a high content of mechanical impurities. Accumulate at the phase boundary, mechanical impurities associated with asfaltosmesiteli and paraffin components of oil, form the intermediate emulsion layers, the appearance of which leads to violations of the technological mode of demulsification, the deterioration in the quality of marketable oil. This reduces the reliability of the system oil treatment and control devices section of phases, i.e., leads to the need to reset /trim/ intermediate layers of the devices of oil even on UPPN equipped with thermal and electrochemical steps of dehydration.

Trap emulsions are stable water-oil emulsions with a water content of up to 40-70% and mechanical impurities from a fraction to several percent.

Characteristic for all trap emulsions is increased solids content.

Fall in oil in different ways solids have a variety of properties. They differ in chemical nature, disperse the strong stabilizing effect on oil-water emulsion reverse type my clay and iron sulfide colloidal dispersion.

There is a method of destruction of oil-water emulsion according to which make it mix with the demulsifier and the subsequent impact on the mixture of the magnetic field (see ed. mon. The USSR 662574, CL 10 G 33/02, 1979).

However, this known method can be successfully applied only when small quantities of the emulsion, for large volumes for magnetic processing of such a large number of emulsion application of this method is technically difficult and economically inefficient.

Also there is a method of destruction of the intermediate emulsion layer, comprising applying the emulsion in the tank, the processing of the intermediate emulsion layer, removing the emulsion from this layer, the subsequent processing of this emulsion derived pulsed magnetic field and the second of its introduction into the tank (see RF patent 2154089, CL 10 G 33/02, 1999).

The disadvantage of this known method is its unsuitability for destruction trap emulsion with a high content of concentrated promela, high intensity and complexity of the binding.

Closest to the proposed technical solution for the intended purpose and the technical nature of a method of processing oil sludge the aqueous solution of the mixture of surface-active substances (surfactants), the effect on the mixture of sludge and compositions of the ultrasonic wave field with a frequency of 15-35 kHz in 3-5 minutes and subsequent sucks for 7-8 hours (see RF patent 2154515, CL 01 D 17/05, 1999).

The disadvantage of this method is the lack of depth and rate of destruction trudnorazreshimoj emulsion, such as a trap with a high content of concentrated promela. The data described in this patent indicate that it received the oil does not meet the criteria of the trademark.

In addition, when implementing this method for one cycle can be destroyed only a limited and relatively small amount of the emulsion (the ratio in the emulsion tank: water is 1:3, respectively).

In addition, the known method requires considerable energy consumption, since the whole process, including subsequent sucks, is carried out at a constant heating below the 50oC.

It should also be noted that in the known method, the sludge does not exclude the process of reverse saturation oil phase mechanical impurities, in particular, iron sulfide, which reduces the rate of destruction trap emulsion, degrades the quality of neftanie commercial oil.

The technical problem solved by the invention consists in increasing the depth and speed of destruction of oil-water trap emulsions, including those with a high content of concentrated promela, the exception when sludge process is the reverse saturation oil phase mechanical impurities while reducing energy consumption.

An additional objective is to ensure the possibility of the destruction of the proposed method simultaneously both small and large volumes of emulsion.

The technical problem is solved by the fact that produce mixing of the emulsion composition, which is used as a composition containing the following components, wt%:

Reagent-based alkylsulfonate - 65-70

The demulsifier based on a mixture of anionic and nonionic surfactants containing a sulfonic acid based on the sodium alkylbenzenesulfonates - 18-22

The reagent on the basis of nitrilotriethanol acid - Rest

while mixing the emulsion with a composition produced by separate and consecutive to each other feed components in the emulsion, after which produce the effect of the wave field on the aqueous phase mode electro impact presny emitter back to the area of the aqueous phase.

The solution of this problem is provided by the next.

Thanks declared component composition used in the proposed method, provides a comprehensive synergistic effect of the components of this composition on booking the shell globules of the emulsion, contributing to their destruction.

Due to the fact that the components of this composition is introduced into the emulsion separately and sequentially provides directed strictly sequential effect on the emulsion, namely: component-based alkylsulfonate (ML-80 ML-72), which gidrofiliziruyuschim, increases the wettability of the mechanical component of the trap emulsion; subsequent introduction Kamalika - demulsifier based on a mixture of anionic and nonionic surfactants containing a sulfonic acid based on the sodium alkylbenzenesulfonates, reduces surface tension at the boundary of the oil-water, reducing the viscosity of the emulsion; and the introduction of the trace of the reagent on the basis of nitrilotriethanol acid has a complexing action, prevent the formation of salt crystals.

As suddenly, the subsequent electro impact by the with demulsification by transferring energy emitter oil-water system and the release of energy at the boundary of the oil - water. In the present method offers the aqueous phase processing of electro influence, representing a kind of microexplosion, which radiates at the same time the whole range of frequencies from 200 kHz to the frequency of infrared radiation (IFC), and with such a wide range is, apparently, a directional change (increase) the activity of all components of the composition introduced into the trap emulsion, due to the energy transfer and simultaneous devastating effects on booking a shell of its globules, which also contributes to the depth of destruction and accelerate the destruction of even such trudnorazreshimoj emulsion, as a trap, with a high content of concentrated promela.

Unexpectedly, it was also found that subsequent sludge eliminates the process of reverse saturation oil phase mechanical impurities, apparently because exerted a protective effect (a kind of barrier for mechanical impurities ) of the composition, the active component of which is increased due to the energy of wave action. This effect is unexpected because it is known that under the influence of wave action when the sludge speeding up the process of reverse saturation oil is to be placed does not occur.

The inventive method is as follows:

- drip emulsion accumulated in the process equipment UPPN injected composition of three components: reagent-based alkylsulfonate, demulsifier Kamalika and reagent on the basis of nitrilotriethanol acid (HMB);

- moreover, these components are introduced into the emulsion separately and alternately with each other;

- then make the impact of the wave field on the aqueous phase mode electro-impact spectrum of frequencies from 200 kHz to the frequency of infrared radiation, which the aqueous phase is subjected to circulation through the electro-emitter back to the area of the aqueous phase;

after each electric pulse effects (such influences can be from 1 to 5 cycles depending on the amount of lump sum destructible emulsion) conduct subsequent sedimentation of the emulsion for at least 6 hours;

- after settling the separated oil phase, representing commodity oil, take and send in the product storage tanks and the water phase at the bottom of the tank, drain and place a block of water.

The proposed method was implemented in field and laboratory conditions.

Components composition:

- reagent-based alkylsulfonate ml of 80 or ML-72 (TU 84-1051-85) is a mixture of alkylsulfonate, sulfonic acid, softener DB or cintanya and copolymer dialkyldimethylammonium chloride and acrylic acid;

the demulsifier "Chemelex h" on the basis of a mixture of anionic and nonionic surfactants containing a sulfonic acid-based materialkombinationen (dodecylbenzenesulfonate), produced by the company "ICI, UK;

the reagent on the basis of nitrilotriethanol acid scale inhibitor, produced according to TU 6-09-20-1-74, under the trademark HMB.

Equipment used:

- reservoir, with a capacity of 3000 m3;

centrifugal pump performance 180 m3/h;

unit dosing of reagents;

- electro-emitter manufactured by the company LLC "New technologies" (, Perm).

For the destruction took 2,7 t trap emulsion of the following composition:

the water content of 12%,

the solids content of 1%,

the content of concentrated promela 54%.

Thus the stabilizer of concentrated promela contains, wt%:

the organic portion 45,

solids 55,

including part m the position in the following sequence: the first was filed hydrophilicity reagent ML-80-70 g/t destructible emulsion, immediately followed by the demulsifier "Chemelex h" in the amount of 20 g/t and scale inhibitor HMB in an amount of 10 g/T. Then, the emulsion composition was sent into the tank. In the tank in the area of the aqueous phase leaving no more than 10% of the water from the total volume of the emulsion, the rest of the water was trenirovki.

The lower part of the tank in the area of the aqueous phase was equipped with a pipe for circulating the aqueous phase (input and output of the pipeline was located in the zone of the aqueous phase).

In the pipeline was embedded electro-emitter operating in the pulse mode, creating a range of frequencies from 200 kHz to infrared wavelength range.

After a small partial sludge trap emulsion produced circulation of the aqueous phase by pipeline within 1 h after electric pulse emitter back to the area of the aqueous phase. Due to its circulation was partial mixing of the aqueous and oil phases with energy transfer. Then made subsequent sucks for 10 hours Such cycles produced three times due to the large amount of destructible emulsion. The results obtained in the implementation of the proposed method, were as follows:

the water content of 0.16%,

the number of solids of 0.03%,

the salt content of 148 mg/l,

that meet the criteria of commercial oil;

when the sludge content of mechanical impurities in the oil phase were:

after 6 h ~ 0,03% or 298,4 mg/l

after 20 h ~ 0,03% or 289,3 mg/l,

that proves the exception of the reverse saturation oil phase mechanical impurities in the process of sludge.

In laboratory tests along with the proposed method was tested effects on trap emulsion of the same composition and the influence of only the wave electric pulse effects without composition. The trap emulsion was used emulsion with the following characteristics:

viscosity 178,0 mm2/s

density 0,925 g/cm3,

the water content of 40%,

the amount of solids 1%.

The results obtained in the tests shown in the table.

The data in the table show that the proposed method has the following advantages over known prototype:

the rate of destruction trap emulsion method proposed in 2 times above, than known, since the destruction of the trap emulsion comprises on the field 100% of oil product quality), while the time of the destruction of the emulsion known in the prototype method is 8-9 hours and all selected oil phase does not meet the criteria of the trademark;

- the proposed method ensures the destruction at the same time arbitrarily large volume trap emulsion, and at the same time get a large amount of stock-tank oil ( 85-100% of the total content of the oil phase in the emulsion), while the known prototype-based method can be destroyed only 4 times smaller, because the destruction occurs when a large amount of water, which is 3 times higher than that of the emulsion, and commercial oil does not work;

- in the implementation of the proposed method is achieved in comparison with the prototype of the reduction of energy consumption due to the complete elimination of heating and unproductive injection of large amounts of water;

- in the implementation of the proposed method dramatically reduces the process of reverse saturation oil phase mechanical impurities, which will continue to improve the process of preparing oil.

Method of destruction of oil-water trap emulsion comprising mixing the emulsion with a composition, the influence of the wave field and the subsequent sucks, the balance of the NT-based alkylsulfonate - 65-70

The demulsifier based on a mixture of anionic and nonionic surfactants containing a sulfonic acid based on the sodium alkylbenzenesulfonates - 18-22

The reagent on the basis of nitrilotriethanol acid - Rest

while mixing the emulsion with a composition produced by separate and consecutive to each other feed components in the emulsion, after which produce the effect of the wave field on the aqueous phase mode electro influence in the generation of a spectrum of frequencies from 200 kHz to the frequency of infrared radiation by its circulation through the electro-emitter back to the area of the aqueous phase.

 

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