MXPA00009961A - Micelle system for the non-acid stimulation of wells producing oil and injecting water. - Google Patents

Abstract

The present invention refers to a micelle system composition resulting from the structure thereof that is formed by micelles; the same can solubilize water and oil having some organic deposits. The composition comprises a hydrocarbon compound, two types of surfactants, alkylaryl sulfonate, a petrol sulfonate, an alcohol and an ethoxylated alkylphenol. The use of said system in the wells stimulation provides an increase in the effectiveness of the oil permeability, thereby increasing the final production and recovery.

Description

MICELAR SYSTEM FOR THE NON-ACID STIMULATION OF WELLS PRODUCERS OF OIL AND WATER INJECTORS DESCRIPTION TECHNICAL FIELD OF THE INVENTION The present invention relates to the composition of a micellar system for the non-acid stimulation of oil-producing wells and water injectors, whose name is derived from its structure which is formed by micelles, which are capable of solubilizing water, oil and water. some organic deposits. It is characterized by being made up of a hydrocarbon compound, two types of surfactants that are an alkylaryl sulfonate and a petroleum sulfonate; an alcohol, and an ethoxylated alkyl phenol.

Its application is carried out in wells producing oil and water injectors. In oil producing wells it is applied as a non-reactive stimulation system, and is recommended for wells that were previously stimulated with an acid system, and that due to the characteristics of reservoir fluids, greater damage has been caused, or that if the stimulation has been carried out for the reason stated above, there is a risk of causing severe damage; It is normally applied in combination with nitrogen, which is why it is necessary to use high-pressure pumping equipment.

BACKGROUND OF THE INVENTION The most common methods for stimulating wells are acidification and hydraulic fracturing. With these methods the permeability of the formation is increased and the effect of the damage in the vicinity of the well is eliminated.

However, some types of damage are more appropriate to treat with other types of stimulation. This is the case when the productivity or injectivity has decreased for any of the following causes: the presence of a strange phase, such as water blockages by filtering the sludge, cement, or emulsions; heavy organic products, present in the formation fluids, such as patines, asphaltenes or resins precipitated during production by changes in pressure and temperature conditions or by chemical reaction with the injected fluids, in particular with acid solutions and the residual oil present in the vicinity of a water injector well.

The need to increase the efficiency of the systems, for the recovery of oil, has led to the development of new secondary and tertiary recovery systems. Among these systems are those aimed at increasing the recovery of hydrocarbons by adding miscible fluids to the displacement water, which dissolve and disperse the residual oil and some organic deposits.

The proper application of micellar systems in secondary recovery projects theoretically allows to displace all the oil contained in the swept area. If it is considered that the factors of primary recovery of oil in a porous and permeable rock are generally of the order of 30%, it is clear the interest to develop these systems, that tested under a special design and of low cost, allow to obtain recovery factors elevated.

In the case of micellar systems, various applications have been reported in the technical literature, especially in the stimulation of oil producing wells and water injectors. In these cases the micellar system, in addition to reducing water saturation, breaks and / or removes emulsions and dissolves and disperses some organic deposits, such as paraffins and asphaltenes present in the vicinity of the well. This results in an increase in the effective permeability to the oil, with the consequent increase in production and final recovery.

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a process for the preparation of a composition of the micellar solution for the non-acid stimulation of oil-producing wells and water injectors, this composition is not caustic or corrosive, is amber opalescent, with a smell Characteristic and completely stable, which is characterized by basically consisting of an ethoxylated alkyl phenol of specific weight between 0.950 and 1.050, an alkyl-aryl sulfonate of specific weight between 0.980 and 1.020, a petroleum sulfonate of specific weight between 0.980 and 1,020, a specific weight alcohol between 0.800 and 0.850, and a hydrocarbon compound of specific weight between 0.800 and 0.850.

For the preparation of the micellar system, a reactor provided with mechanical stirring is required, the operating conditions are ambient temperature and atmospheric pressure.

Once the materials are weighed considering the capacity of the reactor to be used, the aggregation of the same is started with the agitator running in the following order: ethoxylated alkyl phenol, alkyl-aryl sulfonate, alcohol, and petroleum sulfonate. After adding all the materials, the mixture is stirred for another thirty minutes, and the product is discharged in drums of 200 liters, which corresponds only to the concentrate of the micellar system, because the hydrocarbon compound, as it is a considerable volume (65% by weight) will be mixed with the concentrate at the site where the well to be stimulated is located.

During the discharge of the finished product, the necessary samples are taken to perform the quality control of the same. The micellar system quality specifications are presented in table 1 TABLE 1.- QUALITY SPECIFICATIONS OF THE MICELAR SYSTEM EVALUATION IN THE LABORATORY OF THE MICELAR SYSTEM.

Based on the sequence of application of an integral treatment, compatibility tests were programmed by mixing and displacement through partially damaged Berean sandstone nuclei. The first tests consist of mixing equal volumes of contiguous systems and observe the behavior of the mixture at different times, subject to the temperature of the formation. The displacement tests are the simulation of the treatment in rock nuclei.

In the compatibility tests no precipitate was observed; This fact was also verified in the displacement tests.

The results of the displacement tests revealed increases in the permeability up to 1 1 times, when simulating treatments in wells producing oil and 4 times in the corresponding wells water injectors The equipment used in the displacement tests was a permeameter for tests with acid, pressure and temperature, and the results obtained are summarized in tables 2 and 3. In the latter the results of the behavior of the micellar system on a packed core are shown of sand, containing paraffin. Although the main function of said microemulsions is to sweep the residual oil, it was considered convenient to observe its capacity to remove paraffin deposits.

TABLE 2.- SIMULATED TREATMENT IN A BERRY SUNBER NUCLEUS FOR A WELL. Triggering range Permeability ratio. Micellar system EA-301 is a clay stabilizer. TABLE 3.- SIMULATED TREATMENT IN AN OTTAWA 20-40 SAND PACKAGING AND PARAFINE GRADE DEPOSIT F Test temperature: 50 ° C Contact time Micellar-Paraffin System: 1 hour * Interval fired ** Ratio of permeabilities USES AND APPLICATIONS OF THE MICELAR SYSTEM The utility of this micellar system in practice is the removal of some of the different types of damage that cause the productivity or injectivity of the wells to decrease. The types of damage that can be removed with this system are the following: | Blocks by emulsion. | Water blockages by mud and cement filtering. Heavy organic products present in the formation fluids, such as paraffins, asphaltenes or precipitated resins. | Residual oil present in the vicinity of a water injector well.

In the injectors wells, it is applied as one of the stages of an integral treatment, which consists of several stages.

In order to program the necessary laboratory tests for the evaluation of the micellar system, the application sequence of an integral treatment was established, both for oil producing wells and for water injection wells, which is presented in the following sequence . In it are the proposed systems, placed in training WATER WELL TREATMENT FLOWS Nitrogen Nitrogen gas Micellar gas solution 2 1 Produce Wells WATER WELL FLUIDES OF THE TREATMENT A g Stabilizes HCL HCL-HF 15% Water-Water System KCL 5% + + a Water Micellar clays + additive additives additives 8 7 6 5 4 3 2 Injector Wells

Claims (6)

NOVELTY OF THE INVENTION Having described the present invention, it is considered as a novelty, for which the content contained under the following clauses is claimed as property:

1. - A micellar system for the non-acidic stimulation of oil-producing wells and water injectors, characterized in that it is constituted by an ethoxylated alkyl phenol, an alkyl aryl sulfonate, an alcohol, a petroleum sulfonate and a hydrocarbon compound; to remove the damages that cause in the wells a decrease in their productivity and injectivity.

2 - . 2 - A micellar system for the non-acidic stimulation of oil producing wells and water injectors, characterized in that it is constituted by an ethoxylated alkyl phenol, an alkyl aryl sulfonate, an alcohol, a petroleum sulfonate and a hydrocarbon compound; to remove the damages that cause in the wells a decrease in their productivity and injectivity, in accordance with clause 1, characterized in that the specific weight of the components is between 0.950 and 1.050 for the alkyl phenol ethoxylated; between 0.980 and 1.020; for the alkyl aryl sulfonate; for the petroleum sulfoseate between 0.980 and 1.020; for alcohol between 0.800 and 0.850 and for the hydrocarbon compound between 0.800 and 0.850.

3. - A micellar system for the non-acidic stimulation of oil producing wells and water injectors, characterized in that it is constituted by an ethoxylated alkylated phenol, an alkyl aryl sulfonate, an alcohol, a petroleum sulfonate and a hydrocarbon compound; to remove the damages that cause in the wells a decrease in their productivity and injectivity, in accordance with clauses 1 and 2, characterized because once the materials are weighed and considering the capacity of the reactor to be used, the aggregation of the same begins with the agitator in the following order ethoxylated alkyl phenol, alkyl aryl sulfonate, alcohol and sulfonate of petroleum.

4. - A micellar system for the non-acidic stimulation of oil producing wells and water injectors, characterized in that it is constituted by an ethoxylated alkylated phenol, an alkyl aryl sulfonate, an alcohol, a petroleum sulfonate and a hydrocarbon compound; to remove the damages that cause in the wells a decrease in their productivity and injectivity, in accordance with clauses 1, 2 and 3, characterized in that after adding all the materials, the mixture is stirred for thirty minutes, and the product in drums of 200 liters, which corresponds only to the concentrate of the micellar system, because the hydrocarbon compound, because it is a volume of (65% by weight), will be mixed with the concentrate.

5. - A micellar system for the non-acidic stimulation of oil-producing wells and water injectors, characterized in that it is constituted by an ethoxylated alkyl phenol, an alkyl aryl sulfonate, an alcohol, a petroleum sulfonate and a hydrocarbon compound; to remove the damages that cause in the wells a decrease in their productivity and injectivity, in accordance with clauses 1,2,3 and 4 that has the capacity to dissolve asphaltenes and paraffins in the formation, when the system is given a time of adequate residence after the stimulation treatment.

6. - A micellar system for the non-acidic stimulation of oil-producing wells and water injectors, characterized in that it is constituted by an ethoxylated alkyl phenol, an alkyl aryl sulfonate, an alcohol, a petroleum sulfonate and a hydrocarbon compound; to remove the damages that cause in the wells a decrease in their productivity and injectivity, in accordance with clauses 1, 2, 3, 4 and 5, characterized in that by removing the damage in the production formation, it reestablishes the permeability, which improves the conditions of flow through the porous medium of the rock, both in wells producing oil and water injectors.