The composition for enhanced oil recovery

 

The invention relates to the oil industry and can be used to enhance oil recovery when the flooding, and also for processing bottom-hole formation zone. The technical result is the development of high-performance formulations for improved oil recovery, especially with hard to recover reserves. The composition for enhanced oil recovery comprising liquid hydrocarbon, water-soluble nonionic surfactant, water, contains, wt%: as water-soluble nonionic surfactant is a mixture of polyoxyethyleneglycol esters of synthetic primary higher fatty alcohols of General formula CnH2n+1O(CH2CH2O)mH, where n=12-14, m=10 with a molecular mass of 620-654 - 2-20, as a liquid hydrocarbon - polyalkylbenzene resin with a molecular mass of 120-220 - 5-30, water - the rest. table 2.

The invention relates to the oil industry and can be used to enhance oil recovery when the flooding, and also for processing bottom-hole zone injection wells.

Known invert microemulsion-based liquid hydrocarbon for treatment is a mixture of saturated hydrocarbons With6-C8and above) [1. Patent RU No. 2110675, M CL 6 E 21 In 43/22, publ. 10.05.98]. As a stabilizing and washing of the component used here Neprinol H3 additionally stabilizes the emulsion calcium chloride.

Known compound for the treatment of watery layer comprising a mixture of oil and water - soluble nonionic surfactants (nonionic surfactants), namely, ethoxylated ALKYLPHENOLS, liquid hydrocarbons and water in the following ratio of components,% vol.: ethoxylated alkyl phenol with a degree of oksietilirovannye a 5-7 4-9, water-soluble, nonionic surfactants from 0.5 to 3, a liquid hydrocarbon - 1-10, water - rest [2. Auth. St-EN No. 1595066, M CL 6 E 21 In 43/22, publ. 20.01.88].

Neprinol H3 and ethoxylated ALKYLPHENOLS are the components of the composition, Biodegradability which is low, of the order of 50%.

Known compositions are emulsions of the opposite type, i.e. a dispersion of these compounds is a hydrocarbon phase. When the injection of compounds with external hydrocarbon phase is hydrophobic bottomhole injection wells, which leads to a decrease of their pickup. As the hydrocarbon phase usually use the light oils (gasoline, kerosene, diesel fuel).

Compositions prepared acclivity over time. High oil-driving characteristics of the formulations based on ethoxylated ALKYLPHENOLS are explained mainly by the presence in the composition of the diesel fraction. Hexane and diesel fraction that is used as the hydrocarbon phase, are expensive components that are more expensive the part.

The objective of the invention is to develop a highly effective formulations for improved oil recovery, in particular, deposits of unconventional reserves (deposits with high viscosity oil, as well as deposits at the late stage of development).

The problem is solved by the development and use of the composition for enhanced oil recovery comprising liquid hydrocarbon, water-soluble nonionic surfactant, and water. Moreover, as water-soluble nonionic surfactant composition contains a mixture polyoxyethyleneglycol esters of synthetic primary higher fatty alcohols of General formula CnH2n+1O(CH2CH2O)mH, where n=12-14, m=10 with a molecular mass of 620-654, as a liquid hydrocarbon - polyalkylbenzene resin with a molecular mass of 120-220, in the following ratio component - 2-10, polyalkylbenzene resin with a molecular weight of 120-220 - 1-30, water - the rest.

Results nepaviesinau are shown in tables 1, 2.

Product oksietilirovannye alcohols produced by the domestic industry - Sintana ALM-10 [3. THE 6-14-864-88 with changes 1, 2, 3, 4], is a mixture of polyoxyethyleneglycol esters of synthetic primary higher fatty alcohols fraction C12-C14with the number of hydroxyethyl links 10. Specified substance is a pasty mass from white to slightly yellowish in color and is used as an effective surfactant in the manufacture of synthetic detergents, as a degreaser raw wool and metal surfaces.

Polyalkylbenzene resin (ABS) is a byproduct of the production of cumene. PUBS consists of di-, tri-, Tetra-isopropylbenzyl and other more high-molecular polyalkylbenzenes, is a viscous liquid dark color [4. THE 38 10296-83]. Compared to the hydrocarbons used in known compositions for enhanced recovery (light fuel oil), PABS can effectively interact with the capillary-held oil, changing the structure neftegna its size and lowering the viscosity of the oil.

The composition is prepared by dissolving the nonionic surfactants in water and the subsequent introduction of the necessary quantity of the hydrocarbon phase. To obtain a stable composition with a maximum internal content of the hydrocarbon phase is used, typically, the elevated temperature to reduce the difference in the densities of the blending components and increase the dissolving ability of the surfactant.

Study of oil-driving ability of compositions stabilized by the claimed product was carried out in the oil Buraquinho field (heavy oil) and oil Hospitable the Romashkinskoye field (light oil).

Oil-driving ability of the composition was determined on models of the formation length of 350 mm and a diameter of 25 mm, filled with disintegrated core following granulometric composition, %:

Fraction >0,63 mm 2,81

Fraction 0,63-0,315 mm 15,52

Fraction 0,315-0.14 mm 58,65

Fraction <0.14 mm 23,02

Samples of the porous medium under vacuum saturated formation water. The bulk permeability model of 1.3 μm2. Then under vacuum, the sample layer was saturated by oil, with a viscosity of 220 MPa(heavy oil) and 6.2 MPa(light oil). When the vertical position of the reservoir model replaced the oil with water when it is about the ü is injected composition, in the amount equal to one pore volume of the reservoir, and pushed his water until the water coming out of the model fluid sample. The effectiveness of the compositions was determined by addition of the extracted oil. The obtained results of the experiments data are given in tables 1, 2.

High efficiency of the composition due to the fact that an aqueous solution of Cintanya ALM-10 and the hydrocarbon phase (PABS) form a direct emulsion of high stability due to new stabilizer (20C - 1500 hours), which also has good detergent properties are due to the effective reduction of the interfacial tension at the phase boundary and the ability to absorb inside the micelles greater number of washed from the surface of the rocks oil (effect solubilization). The micelle containing in the inner part of the hydrocarbon, can "swell", absorbing the oil. Introduction PUBS promotes greater dissolving the washed oil inside the micelles due to the higher affinity of ABS with high molecular weight components of the oil, forming the core and the solvate shell oil disperse systems (VAT).

When the injection of the composition into the reservoir there is the principle of miscible displacement and reducing the viscosity of the displaced in obstet increase nevesskaya ability of the composition.

Injection of compounds with the external aqueous phase can increase the injectivity of injection wells due to hydrophilization bottom zone (removal from the surface of the breed hydrocarbon components).

The proposed composition of the fire, as the formation of a direct emulsion, where the hydrocarbon component is dispersed in the internal phase. The Biodegradability of one of the components of Cintanya ALM-10 - 85%, which increases the sustainability of the proposed composition for enhanced oil recovery [3].

The stability of the composition in situ determines the stability of the used surfactant in saline waters.

Study of oil-driving ability of the proposed structure showed that the use as a hydrocarbon phase PUBS instead of hexane and diesel fractions allows to achieve greater nevesskaya ability when the cheapening of the cost of the components of the composition.

Also found that by heating the extracted oil-water emulsion with a content of the proposed composition to a temperature of 50With stripes emulsion of water and oil phase without the use of demulsifiers that usually predpolagaete phase (PABS) below 2% leads to a decrease in oil-driving ability, the increase in the content of PABS above 30 wt.% at a given surfactant concentration leads to lower aggregate stability of the solution. The content of surfactant is less than 0.5% does not stabilize the emulsion and does not provide the necessary oil-driving properties. The increase in the concentration of Cintanya ALM-10 more than 20% is not rational.

Claims

The composition for enhanced oil recovery comprising liquid hydrocarbon, nonionic surfactant, water, characterized in that as the nonionic surfactant comprises a mixture of polyoxyethyleneglycol esters of synthetic primary higher fatty alcohols of General formula CnH2n+1O(CH2CH2O)mH, where n=12-14, m=10, with a molecular mass of 620-654, as a liquid hydrocarbon - polyalkylbenzene resin with a molecular mass of 120-220 in the following ratio, wt.%:

A mixture of ethoxylated fatty alcohols of General formula

CnH2n+1O(CH2CH2O)mH, where n=12-14, m=10,

with a molecular mass of 620-654 2-20

Polyalkylbenzene resin with a molecular

mass 120-220 5-30

Water The Rest

 

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