The way of the development of oil deposits

 

The method relates to the oil industry, in particular to methods for development of oil deposits by injection of physico-chemical substances. The technical result is to increase the efficiency of the development of oil deposits by increasing the displacement efficiency of oil from the reservoir, the coverage of the formation process of exposure and isolation of water to the producing wells. In the way of the development of oil deposits, including the injection of an aqueous solution of sodium silicate, the viscosity of the sodium silicate solution are selected so that the mobility of the displaced and the displacing agents in the initial period of exposure was equal, then reduce the concentration of sodium silicate in solution to zero and are pumping water suspension of phosphogypsum waste production of phosphoric acid. Moreover, the concentration of phosphogypsum in the aqueous slurry is 0.1 to 10.0%. 1 C.p. f-crystals, 1 Il., table 2.

The invention relates to the oil industry, in particular to methods for development of oil deposits by injection of physico-chemical substances.

Known composition to isolate water production wells containing sodium silicate (liquid is p> The disadvantage of this structure is its low technological application that is associated with the difficulties of preparing composition with optimum gelation time, because in the process of mixing of the components, even when a slight deviation of the ratio of components or the pH of the composition is a sudden change in the time of gelation until the instant gelation.

There is also known a method of displacing oil from the reservoir by injection of alkaline water (aqueous solutions of NaOH, sodium silicate, etc.,) (see "Injection of alkaline water, Minssieux L Intrt de l'injection d'eau alcaline en recuperation assistee. "Rev. Inst. franc, petrole", 1978, 33, 1, 47-57).

EOR these compositions as compared to water flooding the connection with the manifestation of 2 mechanisms: reducing the interfacial tension between the alkaline solution and the oil and increase the wettability of the rock by the water.

The disadvantages of this method is its lack of effectiveness due to the fact that the immobility of the displacing and displaced agents are not regulated and, as a rule, differ from each other in several times, which leads to a rapid breakthrough of the displacing agent to producing wells, obrabotki oil deposits, includes the injection of an aqueous solution of sodium silicate as a structure-forming reagent zeolite rock, pre-treated with sulfuric or hydrochloric acids. (A. C. 2157451 IPC 7 E 21 In 43/22).

The disadvantage of this method of development is that it is aimed only at increasing reservoir sweep impact, while an aqueous solution of sodium silicate and has a relatively high oil-driving properties. In addition, the disadvantage of this method is the low coverage of hydrophilic flooded reservoirs oil reservoir insulating effect, which is associated with the blocking of the particles of zeolite-containing rocks watered collectors only near the wellhead and is caused by the instability of the suspension of zeolite-containing rocks, which rapidly precipitates, blocking the reservoir oil reservoir. As a result of the deterioration in the profile of the injection well. A significant disadvantage of this method is the necessity of the use of preliminary acid treatment of the zeolite-containing rocks, which requires additional costs, including time and reagents. The method does not provide sufficient reliability isolation obodan the Noah acid treatment and suspending the zeolite breed does-low-tech way.

The aim of the invention is to increase the efficiency of the development of oil deposits by increasing the displacement efficiency of oil from the reservoir, coverage of the impact process and isolate water production to producing wells.

This objective is achieved in that in the method of development of oil deposits, including the injection of an aqueous solution of sodium silicate, the viscosity of the sodium silicate solution are selected so that the mobility of the displacing and displaced agents in the initial period of exposure was equal, then reduce the concentration of sodium silicate to zero and are pumping water suspension of phosphogypsum is a waste of phosphoric acid concentration of 0.1-10%.

The essence of the invention consists in the following.

The process of displacement of oil from the reservoir is characterized by relative acceleration layerexpressed by the ratio of the rate of injection to changes in bottom-hole pressure in the injection and production wells over time (see Gvozdev bpts Operation of gas and gas condensate fields. M.: Nedra, 1988, S. 45-47).

- The drawing shows the dependence of relative injectivity of the reservoir from about the process, when the mobility of the displacing fluid is less than the mobility of the displaced, which is typical during flooding. Curve 3 describes the process field for the case when the mobility of the displacing fluid is higher than the mobility of the displaced fluid (oil). Curve 2 describes the process when the mobility of the displacing and displaced fluids are equal. As can be seen from the drawing, during flooding, when the mobility of the displacing fluid is higher than the mobility of the oil relative permeability of the reservoir increases, which leads to a forced increase of water injection to maintain reservoir pressure and, as a rule, the increase of water production. On the basis of field data we have analyzed the correlation between changes in relative injectivity of the reservoir and change the water content of the produced oil. For the analysis of a selected area of the Soviet deposits, a relatively long time in operation (injection well n, operational 679, 622, 393). The studies found that the relative permeability of the reservoir for the site during the development of flooding will increase with time, which is consistent with the earlier theoretical positions, and obveznosti case, when the mobility of the displacing agent below the mobility of the displaced is the increase in filtration resistance layer, thereby reducing injectivity of injection wells and a decrease in the rate of development of deposits. Comparing the data can be noted that the improvement in development could be achieved by using as the displacing fluid substance, the mobility of which was close to the mobility of the oil. The best option development - when the mobility of the displaced and displacing fluids are equal.

In the proposed method, in the initial period of work download solution of sodium silicate with mobility equal to the mobility of the displaced oil, with a consistent decrease in the concentration of sodium silicate in the injected aqueous solution to zero. This results in the optimal conditions for the displacement of oil from the reservoir, and an aqueous solution of sodium silicate with different concentration and mobility is a collector with different filtration resistance: sodium silicate solution with mobility equal to the mobility of the oil - free after displacement of oil reservoir with high filtration resistance, the solution with the smaller

When the injection of such composition in producing wells of a high-viscosity solution of sodium silicate is mainly to take a highly watered collector, and a solution with lower viscosity and, consequently, with greater mobility, mostly flooded low-permeability reservoir.

Ha the second stage of the work according to the proposed method are downloading phosphogypsum is a waste phosphoric acid production.

Phosphogypsum is a complex mixture of crystalline and aquacomfort calcium, consisting mainly of calcium sulfate and water, containing, in addition, fluorine compounds, silicates, phosphates, phosphoric acid, polyacrylamide and admixture of other substances. Unlike the original mineral raw materials, phosphate rock, and most other chemical compounds and substances containing calcium in the phosphogypsum compounds are highly active form. They are easy to perform in ion exchange reactions and structuring with sodium silicate with education kremnekislyh gels, rather gels polysilicon acids modified with salts of calcium, which have high structural-mechanical and insulating properties. The reaction glioblastoma is subjected to hydrolysis, leading to strong alkalinity of the solution and the formation of acidic orthosilicate sodium (reaction 1), which reacts with calcium-containing compound, gives a sour orthosilicate calcium (reaction 2). Last, arseplay water eventually enters the high-molecular form and eventually forms a practically insoluble jelly reticular spatial structure (reaction 3), which can hold up to 300 or more water molecules produced per molecule of silicic acid. The essence of the process of gelation is condensation of molecules derived silicic acid in more complicated with the release of water. The process of education kinnekulle gels may be slightly different. This is due to the fact that the alkaline silicates and, in particular, sodium silicate in aqueous solution is subjected to far-reaching hydrolysis, which leads to strong alkaline solutions NaSiO4+2H2AboutNa2H2SiO4+2NaOH Na2H2SiO4Na2SiO3+H2O 2Na2SiO3+H2ONa2Si2O3+2NaOH 2Na2SiO5+H2O

The way in industrial conditions is as follows. Pre-determine the mobility of the displaced oil and on the basis of laboratory of experimetal find the concentration of an aqueous solution of sodium silicate with the same mobility.

Using the pumping unit to pump the sodium silicate solution, and the concentration of sodium silicate consistently brought to zero. Next upload aqueous suspension of phosphogypsum. The quantitative ratio between aqueous sodium silicate solution and a suspension of phosphogypsum is 1:1-1:10, the working concentration of the suspension depends on the specific injectivity of wells and formation thickness. The process of gelation occurs in the pore space within 1-3 days. The total number of injected reagents depends on the geological and physical conditions of the reservoir and is 0.05-0.3 pore volume. Spend 1-3 loop.

First, the sodium silicate solution is used as an effective oil-driving fluid. He sang", M., 1981, 5, 15-16. ISSN 0470-6234 the USSR, in Russian). After injection of phosphogypsum in the reservoir there is an interaction of sodium silicate with compounds present in the phosphogypsum with education in flooded oil reservoirs kinnekulle gels with high insulating and structural-mechanical properties. Due to this blocked washed collectors. Next, the injection of water. The water will bypass washed, blocked sewers, displacing oil from the remaining oil-saturated reservoir. Through this treatment, the oil reservoir is achieved by sequential displacement of oil, and increase as the displacement efficiency, and coverage of the reservoir effect.

The proposed method was tested in laboratory conditions. Tests inventive and well-known methods were performed on bulk linear models, i.e. models in which the filled porous material is silica sand. Depending on the size of grains created the desired permeability of the formation model. The sand was stuffed in the model, controlling porosity and permeability of the reservoir model.

Characteristics of the model layer - total length, cm - 100 - diameter, cm - 9,3 - permeability μm2- 0,73-2.3 Characteristics of used oil
density, to the formula:

where K1- the rate of oil displacement;
AndNV- the volume of displaced oil, cm3;
AndNA- the volume of oil originally contained in the model, cm3.

Determined the permeability of the model through the water and through the air, saturated it with distilled water, and then oil.

All used in the experiments reagents meet the state standards. (Sodium silicate liquid glass produces according to GOST 13078, OFPC on TU RB 00203714-04-94). Zeolite-containing rock in the way-the prototype was prepared according to the method specified in the description of the invention of the prototype method.

First, we determined the efficiency of oil displacement by sodium silicate solution with the same mobility that and displaced oil. The results of the experiments are given in table.1.

As can be seen from the results of the experiments, the value of the coefficient of oil displacement reaches the maximum value when in this mode of displacement, when the viscosity of an aqueous solution of sodium silicate selected so that the mobility of the sodium silicate solution was equal to the mobility of the oil. When the displacement ratio greater than other modes of displacement 3.7-8.5%, and wipe with clean water by 15.8%.

We also conducted experiments on the solution of sodium silicate at a concentration of 4%, and then was added a suspension of phosphogypsum and determined pressure breakthrough after 24 hours of exposure. The results in table.2.

The research insulating composition, taken as a prototype, the suspension of zeolite-containing rocks pretreated 2,0% hydrochloric acid.

Thus, it is found that the optimal number of phosphogypsum in the insulating composition is 0.1 to 10.0%, because at lower concentrations the pressure breakthrough decreases, and when more is not increased.

Thus, the combination of features of claims 2 is achieved substantial investigation: in the first stage injection of sodium silicate with mobility equal to the mobility of the oil, optimum conditions for the displacement of oil from the reservoir, and the second is due to the fact that collector with different filtration resistance is pumped solution of sodium silicate with different viscosity and, consequently, the mobility, which fills as high permeability and low permeability reservoir, after the interaction of sodium silicate with phosphogypsum is a more complete block rinsed with water reservoir, which increases the coverage of the reservoir effect.

Thus, the way of the development of oil for the and, that allows to make a conclusion on the conformity of the proposed solutions to the criterion of "inventive step".

According to the authors the information set of essential features that characterize the essence of the claimed invention, is not known at the level of science and technology, that allows to make a conclusion about conformity of the invention, the criterion of "novelty."

The set of essential features that characterize the invention can be used multiple times in the industry with the technical result consists in increasing the efficiency of the development of oil deposits by creating collectors optimal for this particular layer mode displacement and increase the enrolment ratio at the subsequent impact on the collector, and contributing to the achievement of this goal, which allows to make a conclusion about conformity of the invention, the criterion of "industrial applicability".


Claims

1. The way of the development of oil deposits, including the injection of an aqueous solution of sodium silicate, characterized in that the viscosity of the sodium silicate solution are selected so that the mobility of the displaced and the displacing agents sodium in the solution to zero and are pumping water suspension of phosphogypsum - waste phosphoric acid production.

2. The method according to p. 1, characterized in that the concentration of phosphogypsum in the aqueous slurry is 0.1 to 10.0%.

 

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25 cl, 1 tbl, 3 ex

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EFFECT: increased oil recovery.

2 cl, 2 tbl, 2 ex

FIELD: oil and gas production.

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EFFECT: increased oil production, prolonged overhaul period, improved environmental safety, and lowered production expenses.

2 tbl, 3 ex

FIELD: oil and gas extractive industry.

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2 cl, 2 tbl

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2 cl, 3 ex, 6 tbl, 2 dwg

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EFFECT: higher efficiency.

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EFFECT: higher efficiency.

2 tbl, 2 ex

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