Foamable composition

 

(57) Abstract:

Foamable composition can be used in the oil industry, in particular, in the development of oil fields with the use of heat. Increasing thermal stability of the foam while increasing its ratio is achieved due to the content in the composition of the salts of tall oil acids - /2 wt.%/, bischofite /1 - 2/ sodium metasilicate /2 - 4/ fresh water /OST/.

The invention relates to the oil industry, in particular to the development of oil fields with the application of heat.

In the development of oil fields with heterogeneous reservoirs with the use of thermal methods is injected into the reservoir, the coolant is distributed mainly in zones of high permeability. This leads to insufficient coverage of the formation process development and low oil recovery. With the aim of promoting the development of zones of low permeability and increase oil recovery applied foamable composition that is injected into the formation to block the zones of high permeability. These structures must meet certain requirements, the most important of which is the stability of the injected composition.

Known Talne

Also known three-phase foam from a foamable composition containing, in wt.%: DS-RACES of 0.5-1.5 sodium Silicate 3,0-5,0 potassium chloride water the Rest (1% CaCl2+ 0,2% Ca (OH)2)

Closest to the proposed technical solution composition and mechanism of stimulation is a foamable composition containing, by weight. % : DS-RAS 0,5-2,0 Water 8-16% solution of hydrated magnesium chloride or magnesium chloride (bischofite 50,0 Water 3,15-6,3% solution of sodium hydroxide 50,0 when the stoichiometric ratio of sodium hydroxide to magnesium chloride.

A common shortcoming of all these formulations based on DS-RAS is insufficient thermal stability, which makes use of known compounds in a number of fields where applied thermal development methods, as the temperature is injected into the reservoir a couple, as a rule, exceeds 200aboutC. At these temperatures known compositions are subjected to destruction and decay.

The purpose of the proposed invention is to improve thermal stability of the foam while increasing its multiplicity.

This objective is achieved in that the foamable composition including a foaming agent, as electrolytical sodium in the following ratio of ingredients, wt.%: Tall oil soap 1-2 Bischofite 1-2 Metasilicate sodium 2-4 Fresh water the Rest when the stoichiometric ratio of bischofite and sodium metasilicate and subsequent foaming of the solution obtained by the known methods.

Based on the above we believe that proposed by the authors of the foamable composition meets the criterion of "novelty."

Offer foamable composition with the above set of components with high thermal stability with a simultaneous increase in the multiplicity of the resulting foam, which allows using it in a number of fields with the use of thermal methods, where the temperature in the reservoir reaches 150aboutWith, while many well-known foamable compositions at this temperature are subjected to degradation and destruction.

The resulting foam can be used to control the process heat to increase oil recovery.

We believe that the inventive foamable composition meets the criterion of "substantial differences".

To obtain the tall oil soap is used tall oil, which is obtained by adding tall oil soda ash or sodium hydroxide is fatty and resin acids, and neutral substances. Among the fatty acids in the greatest quantity is oleic 28-43%, linoleic acid - 0,5-2,0%, stearic acid. Produced by MRTU 13-05-13-65. The acid number of the crude tall oil ranges from 115 to 175 temperature -206aboutC.

Bischofite (MgCl2x 6 H2O) - crystalline powder, is produced according to GOST 7759-73 "Uralkali" or "karabogazsulfat".

Metasilicate sodium produced NGOs Stone and silicates".

In laboratory studies of the properties of the proposed foamable composition at different ratio of components. According to the standard methods defined two parameters characterizing the quality of the foam: the stability and multiplicity.

The mapping properties of the proposed structure with the prototype shows that with increasing temperature up to 150aboutThe proposed structure is characterized by good properties: stability - 36-114/cm3, the magnification of the volume of the foam - 17-90. The composition of the prototype at a temperature of 150aboutWith no foam forms. Thus, based on the proposed composition can be prepared three-phase foam, which keeps the stability in the layers, where the temperature reaches 150is teotwaki layers.

Analysis of the results of determination of foaming properties of the composition (see table. ) shows that with the decrease in the content of metasilicate to 1% and bischofite to 0.5% of the foam is formed. With the increasing content of metasilicate to 2% and bischofite to 1% foam stability 60-65/cm3and multiplicity 37-90. With the increasing content of sodium metasilicate to 4% quality foam improves only with a simultaneous increase in the content of bischofite to 2%, with a further increase in the content of metasilicate to 6% and a simultaneous increase in the content of bischofite to 3% quality foam remains the same as when the content of the above ingredients 4 and 2%, respectively. Change the content of the tall oil soap with 1 to 2% does not lead to a substantial improvement in the quality of the foam. When the content of the tall oil soap 0.5% quality foam is deteriorating. Thus, the optimal composition of the foam is obtained by the following ratio of ingredients: tallow soap - 1-2%, metasilicate sodium - 2-4%, bischofite - 1-2%, the rest is fresh water.

An example of the preparation of the foamable composition in field conditions.

In the capacity of a flooded 1200 l fresh water with a temperature of 80aboutWith 100 l of tall oil and 23 kg of soda ash. After 3-4 hours in a container and within 3-4 h and together with the air pumped into the reservoir, heated to a temperature of 150aboutC.

Proposed by the authors foamable composition can expand the boundaries of its use in a number of fields with the use of thermal methods.

FOAMABLE COMPOSITION containing a foaming agent, bischofite and the aqueous phase, characterized in that it further comprises a liquid glass as the foam - saponified tall oil acid, and as the aqueous phase is fresh water in the following ratio, wt.%:

Saponified tall oil acids 1 to 2

Bischofite 1 - 2

Liquid glass 2 - 4

Fresh water the Rest

 

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