A method of obtaining a gelling composition

 

(57) Abstract:

The invention relates to the field of production of gel-forming compositions used, in particular, in the development of hydrocarbon deposits. The technical result consists in the fact that it simplifies the technology of preparation of the gel-forming composition, because it eliminates the need for maintaining the ratio of nepheline and acid strictly 1:1; expands the scope of application of the gel-forming composition - it can be used not only to solve private problems (isolation of highly layers and, consequently, reduce the water content in crude production and isolation of zones of absorption in the injection wells), but also for waterproofing of other layers (including the folded carbonate rocks), and, for example, cement behind casing. While such operations are not limited to injection wells; gel-forming composition suitable for curing the liquid waste. In the method of obtaining the gel-forming composition comprising a dilute acid saline liquid and dissolve in this mixture of nepheline-containing additives, as specified fluid use salt water environment, the content is Oia gelling composition can be used nepheline concentrate, nitric, sulfuric, hydrochloric and phosphoric acids. Trademarks acid dilute aqueous solutions of these salts to a concentration of 5-20%, then add nepheline concentrate at the rate of: 1 wt.h. nepheline concentrate on 4-15 wt.h. the mineralized acid solution and stirred for one hour. table 1.

The technical field.

The invention relates to the field of production of gel-forming compositions used, in particular, in the development of hydrocarbon deposits.

The level of technology.

A method of obtaining a gelling composition "the Net" by mixing nepheline-containing powdered material and 5-20%-aqueous solution of a strong acid (see RF patent №2064570. A method of obtaining a waterproofing composition. Bull. 21, 1996). This composition is characterized by increased resistance to the dilution water and hydrogen sulfide aggression. The disadvantages of the composition can be attributed to the use of nepheline concentrate containing up to 18% insoluble components.

Also known is a method of obtaining a gelling composition comprising a mixture of 50-70 kg of nepheline with 1 m310% aqueous hydrochloric acid solution (see RF patent №2046183. The way of the development of oil dstone nepheline, which is completely dissolved in an aqueous solution of hydrochloric acid. Thanks to the gel-forming composition does not contain a solid phase and has high penetrating power. The disadvantages of the method include the necessity of using an aqueous solution of hydrochloric acid only 10% concentration, which limits the possibilities of its use.

A method of obtaining a gelling composition comprising mixing in an aqueous environment 3-15% of nepheline and 5-9% hydrochloric acid (see RF patent №2089723. The method of development of oil fields. E 21 IN 43/22. Bull. 25, 1997). The advantage of this method is the possibility of their use for the preparation of gel-forming composition of brackish produced water density 1.07 g/cm3. Due to this expands the possibilities of its use. The disadvantages of the method include low strength of the gel and the formation of gas bubbles during its interaction with carbonate rocks. When waterproofing works this limits the scope of the gel-forming composition of carbonate rocks, and when it is used for curing liquid waste increases the permeability of the cured material.

The prototype of the invention AVL-fractured reservoir. E 21 In 43/22, example 2), comprising preparing a solution of 27% hydrochloric acid, water, wastewater, and nepheline, stirring until complete dissolution of nepheline, filtering the resulting solution with the purpose of removal of sand (5-10% of the volume of nepheline).

The advantage of this method is the possibility of using the gel-forming composition in the way that impacts on carbonate porous-fractured reservoir by sequential injection through injection or production well gelling composition and podavlivaya fluid - oil, keeping technological pause, and then upload 10-17%-aqueous solution of hydrochloric acid. This solution enhances the efficiency of the impact on porous-fractured reservoir by increasing the depth of penetration of the gel-forming composition into the formation, a complex influence on the selected object, as well as by ensuring high strength and stability of the resulting gel system in the reservoir.

The disadvantages of the prototype method of obtaining the gel-forming composition should include the following:

the need to use water only solution of hydrochloric acid and strictly 27% concentration (operamania solution of 27% hydrochloric acid, wastewater and nepheline order to remove the sand (5-10% of the volume of nepheline);

the low strength of the gel formed by contact of the gel-forming composition with clay-containing rocks. Therefore, the gel-forming composition is applied only when exposed to carbonate, i.e. not containing clay particles collector;

the formation of gas bubbles in the interaction of the gel-forming composition of the carbonate rocks, which reduces the permeability of the reservoir oil. For protection of the collector from the reduction of the relative permeability to oil gelling composition is used in combination with the rim of the oil, which is sure to fetch followed by;

gel-forming composition, as follows from the description of the invention, solves only private task isolation of highly layers and, consequently, reduce the water content in crude production and isolation of zones of absorption in the injection wells. In commercial practice there is a necessity of waterproofing not only high, but also other layers (including the folded carbonate rocks), and, for example, cement behind casing. While such operations are not limited to imally volume of the gel, bridging the highly conductive channels and cracks, can only be achieved if the injection followed by rims of oil. This greatly complicates the application of the gel and makes the process environmentally and inflammable;

gelling composition effectively reduces the permeability for water (93,8-98,55%) for the content of 7-10% of nepheline and 7-10% hydrochloric acid (description of the invention, table 1). As the reduction component concentration (less than 8%) and increase (for example, up to 9-10%) accompanied by a deterioration of water capacity of the gel. It should also be noted that a positive result is achieved only if the component ratio of 1:1. So, if sootnoshenie nepheline and hydrochloric acid 1,11:1 water permeability decreases with 98,5% to 93.8% (table 1, 6). Such properties of the gel-forming composition makes it extremely-low-tech, because when promoting gelling rims in the most remote area of the reservoir, characterized by increased permeability, inevitably there will be a dilution of the gel-forming composition of the formation water and the change in the ratio of components. When the reduction component concentration of only 1% (from 8% to 7%) permeability will increase by 3.7%, and lowering the concentration to the and stability of the resulting gel system in the reservoir in a narrow concentration range of components, the formation of gas bubbles in the interaction of the gel-forming composition of carbonate portamee make it not applicable for curing the liquid waste, which indicates monofunctionality and narrow the scope of this composition.

The essence of the invention.

A method of obtaining a gelling composition is diluted acid saline fluid and dissolved in this mixture of nepheline-containing additives. As mineralized fluids used salt water environment containing chloride of sodium, potassium, calcium and magnesium, with the density of the liquid phase is not less than 1.12 g/cm3. In contrast to the method of the prototype to obtain a gel-forming composition, nitric, sulfuric, phosphoric and oxalic acid.

Achieved in the implementation of the proposed invention the technical result is the following:

simplified technology of preparation of the gel-forming composition, because it eliminates the need for maintaining the ratio of nepheline and acid strictly 1:1;

expands the scope of application of the gel-forming composition - it can be used not only to solve private problems (isolation you is to be placed in the injection wells), but for waterproofing of other layers (including the folded carbonate rocks), and, for example, cement behind casing. While such operations are not limited to injection wells;

gel-forming composition suitable for curing the liquid waste.

The possibility of carrying out the invention.

Confirmed experimentally. To prepare the gel-forming composition used nepheline concentrate (TU 2111-28-0020039-38-93), nitric, sulfuric, hydrochloric, phosphoric and oxalic acids, as well as mineralized water environment - aqueous solutions of chlorides of sodium, potassium, calcium and magnesium. Trademarks acid was diluted aqueous solutions of these salts to a concentration of 5-20%, then added nepheline concentrate at the rate of: 1 wt.h. nepheline concentrate on 4-15 wt.h. the mineralized acid solution and was stirred for one hour. Thus obtained Sol was applied onto calcite plate to determine the nature of its interaction with carbonates. The main volume of the Sol was poured into a vessel with limestone poured and left alone for gel formation. After 24 hours the vessel was weighed and over the gel poured water ssti gel was removed and the vessel was re-weighed. The increase of mass of the vessel was determined by the amount of water absorbed by the gel. The filtration coefficient Kfwas calculated as the ratio of the volume of the absorbed water to the filtration area per day, converted to mm/day.

Dynamic viscosity of the gel at the end of the process of gelation was determined by the rate of free vertical drop of the lead cargo weighing 1.2 g of conical shape. The calibration is done by measuring the vertical velocity of the free fall of the load in glycerol (GOST 6259-75) at the same temperature of 22°C.

When developing technologies for the gel-forming composition, it was found that the best results are achieved when using sulfuric acid. Therefore, the research results (see table) is provided only for the sulfuric acid.

Examples of the method.

The preferred option of the invention is the following.

Commodity sulfuric acid diluted with a solution of sodium chloride density 1.20 g/cm3to a concentration of 10%. To 200 ml of this mineralized acid solution was added 45 grams of nepheline concentrate and stirred until it dissolves within one hour. A few drops obtained feud limestone poured and left alone for gel formation. After 24 h started the procedure for determining the coefficient of filtration. For this TOf=0.03 mm/day.

In accordance with the above example were investigated various ways to obtain a gel-forming composition, details of which are shown in the table.

As follows from the data presented in the table, when receiving the gel-forming composition of the proposed method (experiments 5-12) gassing when applying Zola on calcite plate is missing. The filtration coefficient for gel, resulting zastudnevaniju Zola, is 0.01-0.06 mm/day, that is many times less than for gels obtained in any other way (experiments 1-4, 13).

In experiments 11 and 12 was simulated curing of mineralized waste (e.g., drilling fluids, glenashley slimes underground brines in salt cameras, and so on). In experiment 11 in the brine of sodium chloride density 1.18 g/cm3additionally was introduced palygorskite clay, and in the experience of 12 required density of the liquid phase is achieved by the use of dilute acid suspension prepared from potassium and sodium ginecologo sludge. In both cases, the results are almost naprapac 13), the filtration coefficient of the cured material is 0.25 mm/day. In this case, harmful substances will intensively be flushed out of the cured material. Therefore, this method of getting the gel-forming composition is not suitable for use in the curing liquid waste.

According to the invention for patentability.

The proposed invention is novel, as the gel-forming composition as described above in the prior art is not known.

It has an inventive step, because the ability to obtain the technical result of the proposed method is not obvious from the prior art.

Industrial applicability of the invention have been verified experimentally. How to implement in an industrial environment, because its implementation requires some funds.

Thus, this invention satisfies all the conditions of patentability.

A method of obtaining a gel-forming composition comprising a dilute acid saline liquid and dissolve in this mixture of nepheline-containing additives, characterized in that, as specified fluid and the coy phase not less than 1.12 g/cm3.

 

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