Composition for oil recovery

 

(57) Abstract:

The invention relates to the oil industry, and in particular to compositions for oil recovery in order to limit water shut-in producing wells and enhanced oil recovery. Composition for extracting oil contains, wt%: Neprinol GSZ - 10-15; synthetic latex - 2-5; liquid hydrocarbon - rest. The technical result is high efficiency for enhanced oil recovery watered formations that are in late stage development, by improving the stability of the composition, increase oil-driving ability, increase coverage of the reservoir effect. table 2.

The invention relates to the oil industry, and in particular to compositions for oil recovery in order to limit water shut-in producing wells and enhanced oil recovery.

Know the application to enhanced oil recovery composition containing the emulsifier based on esters of oleic, linoleic, linolenic acids, resin acids and triethanolamine (netanel NC), liquid hydrocarbon, calcium chloride, and the rest water (see U.S. Pat. NO. 2110675, E 21 IN 43/22, 1997).

The disadvantages of this composition are low aggregate ostoich the layer.

Closest to the technical essence and the achieved effect is a composition containing the emulsifier based on esters of oleic, linoleic, linolenic acids, resin acids and triethanolamine (netanel NC), oil and water (see U.S. Pat. NO. 2168617, E 21 IN 43/22, 1997).

The disadvantage of this composition is low efficiency due to the lack of increase in coverage of layer effects due to the low viscosity and stability of the emulsion formed by mixing with water in the flushed zone formation.

The present of the invention is to create a more effective structure for oil recovery by increasing the stability of the emulsion composition, increasing its oil-driving ability to increase oil recovery by increasing the coverage of the reservoir effect.

The problem is solved in that the composition for the extraction of oil containing oil-soluble surfactant and a liquid hydrocarbon according to the invention as an oil-soluble surfactant contains hydrocarbon dispersion esters of oleic, linoleic, linolenic acids and resin acids and colloidal dispersion ptx2">Oil-soluble surface-active

substance-Neprinol-GSZ 4-15

Synthetic latex 2-5

Liquid hydrocarbon Else

Salient features of the developed composition are as follows.

Use as an oil-soluble surfactant hydrocarbon dispersion esters of oleic, linoleic, linolenic acids, resin acids and colloidal dispersed phase-emulsifier of Netanya GSZ.

Introduction to the microemulsion of Netanya GSZ allows, firstly, just as in the prototype, to adjust the hydrophilic-lipophilic balance of the system; secondly, increases the viscosity and to improve the rheological properties of the emulsion composition due to the presence of colloidal dispersed hydrocarbon phase. This ultimately contributes to the improvement of water properties of microemulsions, improving coverage of the reservoir pressure and increase oil recovery. The specified ratio of the components contributes to the improvement of the rheological properties of the composition and increase the stability of the formed emulsion, prevent early failure in formation.

The introduction of the synthetic is element of a reverse emulsion, and as a consequence is formed of multiple emulsion having a high structural and rheological properties.

Emulsifier Neprinol GSZ is a hydrocarbon dispersion esters of oleic, linoleic, linolenic acids and resin acids and colloidal dispersed phase. Neprinol GSZ produced according to TU 2458-057-17197708-01. Appearance - viscous oily dispersion from light brown to brown.

Synthetic latex is a straight hydrocarbon emulsion (uglevodorodnaya) oligomers rubber with a particle size of 0.05-2 μm (25-50%) in water, stable water-soluble surfactant. As the synthetic rubber latex may be used latex SCMS-ARC on THE 2294-070-16810126-98 or any other.

As the liquid hydrocarbon used oil - crude oil produced at the field. The extracted oil is used because of its low cost and availability, and also because of its composition, is similar to the composition of the oil contained in the reservoir. In addition to oil, you can use a stable gas, gas condensate, diesel fuel, waste diesel fuel, as well as a wide fraction of light hydrocarbons.

Part of the goth is aisle.

Benefits provided by the fact that when mixed with formation water produced multiple emulsion having a high viscosity, which upon further advancement of structured and contributes to the creation of effective resistance to the flow of injected water in the flushed zone formation and their subsequent clogging. The introduction of the synthetic latex, representing a direct emulsion of hydrocarbon oligomers in water, stable water-soluble surfactant helps to stabilize and additional structuring of the composition, representing the inverse emulsion, and, as a consequence, there is formed a multiple emulsion having a high structural and rheological properties.

The effectiveness of this composition was determined by reducing the permeability of the porous medium and increase oil recovery by well-known methods.

Example 1. Prepare composition No. 1. Poured into a flask with 4 ml of Netanya GSZ, 2 ml of synthetic latex, 4 ml of oil and stirred for 10 minutes. Similarly prepared composition No. 2-6 (table. 1). All formulations tested for the stability of the resulting microemulsions for 35 days. Tawlae

Example 2. Oil-driving properties define in terms of Tootmine residual oil in bulk model of the reservoir with a length of 40 cm and a diameter of 3 see Model under vacuum saturated with water, the weight method is determined by the permeability model for water (PR=3,01 μm2). Then under pressure in the pump model oil and exit anhydrous oil and determine the initial oil saturation, which is 64.3%. Next upload 3 pore volumes of water. After waterflood residual oil saturation is 26.7%, the ratio of oil displacement by water to 0.63. Then pumped through the model one pore volume of the composition of the following composition, wt.%: Neprinol GSZ - 10, 0mm; synthetic latex - 5,0: oil - the rest. Push the composition of the three volumes of produced water. Residual oil saturation is then 20,1%, crude oil displacement - 0.89, increase the displacement efficiency - 0,26. Similarly experiment with compositions other component of the composition. The results of experiments on the displacement of oil through the formation model is given in table.2. Increase the displacement efficiency 0,26-0,36 0,2 against the prototype, i.e. higher than 1.55 times.

Example 3. Water is re 2, in conditions close to the reservoir. Through the model, filtering the produced water with a salinity of 150 g/l at a constant volumetric flow of water 5 m3/h to stabilize the pressure drops and the cessation of oil displacement. Then pumped through the model indicates that the microemulsion of the following composition, wt.%: Neprinol GSZ-10, 0mm; synthetic latex - 5,0: oil - the rest. Filtering stop, stand for 8 hours and again filtered produced water to stabilize the pressure in the reservoir model and the cessation of oil displacement. The pressure drops according to the law Darcy determine the relative permeability changes in the reservoir model. The results of the experiments (table.2) show that the composition can significantly increase the permeability reduction (14%) in water-saturated part of the reservoir, thereby to increase the coverage of the reservoir water flooding and enhanced oil recovery.

Presented in table.2 data shows that the proposed structure allows to increase the degree of decreasing the permeability of the water-saturated part of the reservoir, thereby to increase the coverage of the reservoir water flooding and to increase oil recovery.

The composition of simple and high-tech, high efficiency (="ptx2">

Composition for extracting oil containing oil-soluble surface-active substance, liquid hydrocarbon, characterized in that as the oil-soluble surface-active substances it contains hydrocarbon dispersion esters of oleic, linoleic, linolenic acids, resin acids and colloidal dispersed phase - Neprinol GSZ and additionally synthetic latex in the following ratio, wt. %:

Oil-soluble surface-

-the active substance Neprinol GSZ 4-15

Synthetic latex 2-5

Liquid hydrocarbon Else



 

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