Dispersed gelling composition for the development of oil fields by flooding

 

The invention relates to the oil industry, in particular compositions for the development of oil fields by flooding, and can be used to increase oil production by isolating the water inflow to the oil wells, the elimination of cross-flows, and change the filtration characteristics of heterogeneous reservoirs. The technical result is the creation of a structure that is efficient, cheap, eliminates the use of expensive synthetic polymers, has a higher sedimentation stability, degree of swelling and residual resistance. Dispersed gelling composition for the development of oil fields by flooding includes powdered filler of plant origin, containing additional 5-20 wt.% pectin containing powder obtained by mechanical activation of pectin containing plant raw materials, alkali and water in the following ratio, wt.%: the specified filler - 1,0-3,0, alkali - 1,5-3,0, water - the rest. 3 table.

The invention relates to the oil industry, in particular compositions for the development of oil fields by flooding, and can be COI is x overflows, and change the filtration characteristics of heterogeneous formations.

Known fibrous material, representing wood dust, which is the waste processed plywood grinding method. Suspension of fine wood dust in water with a concentration of 1.5 wt.% has a high seal ability, reduces the rate of pickup of oil wells and leads to a significant increase in oil recovery (1. Y. C. Baranov, I. I. Nigmatulin, M. A. Malik, S. C. Chugunov, A. N. Shakirov, M. A. Zheglov "New fibrous material in the range of reagents for resource-saving technologies of enhanced oil recovery". Conference materials, Production, preparation, transport of oil and gas, Tomsk, 2001, S. 40 - 43).

However, the use of such a dispersed filler does not provide gelation. Stocks of wood dust (flour), obtained by treatment of plywood by a grinding method, is limited and cannot meet the needs of the oil industry in full.

The closest technical solution chosen for the prototype is dispersed gelling composition for the development of oil fields, including wood flour, gelling polymer and alkali (2. Pat. RF 2 is based polymer is polyacrylamide, polyoxyethylene or carboxymethyl cellulose at a concentration of 0.05 to 1.0 wt.%. As the alkali used caustic soda, sodium silicate or potassium hydroxide at a concentration of 0.05 to 20.0 wt.%).

The disadvantage of this composition is the use of expensive polymer, and high consumption of alkali necessary to increase the rate of swelling of solid particles of wood flour.

The problem solved by the claimed technical solution is to create effective, cheap dispersed gelling composition based on vegetable raw materials, which eliminates the use of expensive synthetic polymers and has a higher sedimentation stability, degree of swelling and residual resistance factor.

The problem is solved due to the fact that the dispersed gel-forming composition for the development of oil fields by flooding, including powdered filler plant origin, alkali and water, the filler composition further comprises 5-20 wt.% pectin containing powder obtained by mechanical activation of pectin containing plant raw materials, in the following ratio of components, wt.%: Powdered filler rastitel the logical solution use a filler, including additional 5-20 wt.% powdered pectin containing plant material, subjected to a preliminary mechanical activation.

Pectin is found in large amounts in some types of plant materials and is a natural gel-forming polymer. To increase the solubility and extraction of pectin from plant materials used mechanochemical activation in high-stressed mill.

Thus, the filler of the inventive composition contains flour vegetable origin that do not contain pectin and capable of swelling, and flour vegetable origin containing pectin in the free state and ensuring the process of gelation when using the claimed composition.

The analysis of the prior art, including searching by the patent and scientific and technical information sources containing information about the analogues of the proposed technical solution, allowed to establish that the applicant is not detected compound for the development of oil fields, identical to declare.

The use of pectin containing flour in the filling of the proposed structure, used for regulating the development of oil fields, as well as soovivad on the compliance of the claimed composition criteria of "novelty" and "inventive step" by applicable law.

As pectin containing plant raw material use waste some productions, which contains large quantities of pectin, such as baskets sunflower seeds, bark of coniferous trees, algae, particularly kelp, rice husk, waste processing beet, citrus fruits, apples, berries, etc.,

The main component of the filler in the inventive composition is a powder made from plant materials that do not contain pectin. This can be wood flour, straw, various cereals, fire flax, processing waste cotton, waste paper and other waste. This component is prepared by any known method, in particular, can be used and waste in the production of plywood.

The inventive composition is prepared as follows.

Pectin containing plant material is subjected to grinding and mechanical activation in vibratory centrifugal mill-activator (VCM) with acceleration of the grinding bodies 80-200 m/s2.

During mechanochemical activation of pectin containing feedstock is split links connecting pectin to cellulose, cellulose, hemicellulose and other high-molecular compounds of the cell wall of plant raw materials. The resulting after mechanical activation of powders emit, the C which is the filler of the proposed structure, flour plant origin containing pectins and do not contain pectin, mechanically stirred. You get a mixture containing 5-20 wt. % flour vegetable origin containing pectins.

To prove the compliance of the claimed composition of the criterion of "industrial applicability" presented concrete examples of its use.

Evaluation of the effectiveness of the claimed invention and the composition of the prototype was carried out in laboratory conditions on the following parameters: the degree of swelling, the sedimentation stability of the dispersed particles and the residual resistance factor generated generated in the reservoir systems.

The degree of swelling, the settling time of the resulting composition, as well as the residual resistance factor of the layer was determined as follows: - the degree of swelling is to change the volume of the filler prior to immersion in the alkali solution and after immersion and keeping it up to maximum volume. While the amount of filler was 1-3 wt.% of the total weight of the dispersion, and the content of the flour vegetable origin containing pectin was 5,10,15 and 20 wt.% from the total amount of the order is after complete swelling of the filler in alkaline solution; - residual resistance factor was determined by filtering the composition through a model of fractured-cavernous formation consists of quartz sand permeability 8-41 μm2. The saturated model was prepared (like prototype) by injection of 3 pore volumes of water at constant pressure to the exit on the steady-state filter mode, locking the filtering unit volume of water - Tin. Then through the model of the reservoir was pumped to a steady-state mode filter about three pore volumes of the investigated dispersion of solid particles CPF in an aqueous alkali solution and recorded the time filtering unit volume of the pumped fluid. The residual resistance factor of each fluid was determined by the formula ROST=Tin/So the value of POSTjudge insulating properties of the resulting systems: the more ROST, the greater the insulating properties of their and, therefore, more efficient working structure for the development of oil fields.

Below are specific examples of the preparation of the proposed structure and composition of the prototype, and evaluate their effectiveness tested under laboratory conditions. All examples are summarized in tables 1, 2 and 3.

Example 1.

Prepare napolnitel pectin containing powder, obtained from the head of the sunflower. 2 g of the mixture was dispersed in 100 ml of an aqueous alkali solution with a concentration of 1,5; 2,0; 2,5; 3,0 wt.%. The results determine the time of deposition and the degree of swelling are shown in table 1, examples 1-4.

Example 2.

Mix 80 g flour straw and 20 g of pectin containing flour. The dispersion is prepared analogously to example 1 (table. 1, samples 5-8).

Example 3.

Mix 85 g flour straw and 15 grams of pectin containing flour. The dispersion is prepared analogously to example 1 (table. 1, samples 9-12).

Example 4.

Mix 90 g flour straw and 10 g of pectin containing flour. The dispersion is prepared analogously to example 1 (table. 1, samples 13-16).

Example 5.

The residual resistance factor was determined for injection into the layer of the composition containing 2 wt.% filler, vklyuchayaego 15 wt.% pectin containing flour and 85% flour wheat straw in an aqueous alkali solution with a concentration of 2 wt.%. The results to determine the residual resistance factor of the layer are shown in table 2.

When comparing the results of the proposed structure with the prototype established that the residual resistance factor increases from 4.2 to 6.5 to 4.6 to 7.2.

Summary of research results the proposed structure and composition of the prototype set is p>

To reduce the concentration of solid particles in the dispersion is less than 1 wt.% makes no sense, because in this case the gel formation occurs very slowly or gel is not formed. To increase the concentration of solids in the dispersion above 3 wt. % is not necessary, as it increases the flow of components, and the properties of the gel while not significantly change.

The optimum concentration of alkali in the inventive composition is 1.5 to 3 wt.%. At a concentration of less than 1.5 wt.% the gelation process is slow, and to increase the concentration of alkali above 3 wt.% it is impractical.

The optimal concentration of pectin containing flour filler is 5-20 wt. %. Because when the concentration of the pectin containing flour below 5 wt.% gelation is not enough, and the introduction of excessive amounts of it (above 20 wt.%) does not improve the properties of the dispersion.

Comparison of results of studies of the proposed structure with the prototype shows that the settling time of the proposed structure is higher than that of the composition of the prototype: - the claimed composition - 30-180 min
- composition prototype - 2-35 minutes

The degree of swelling of the proposed structure is 170-580 wt.%, and the prototype - 140-240 wt.%. Moreover, to achieve these results sufficient concentration of alkali from 1.5 to 3.0 Prov. /p> As can be seen from table 3, the inventive composition is more effective than the composition of the prototype. In addition, it is much easier, does not require high concentrations of alkali and expensive synthetic polymers.


Claims

Dispersed gelling composition for the development of oil fields by flooding, including powdered filler plant origin, alkali and water, characterized in that the filler composition includes the addition of 5-20 wt. % pectin containing powder obtained by mechanical activation of pectin containing plant materials in the following ratio of components, wt. %:
Powdered filler of plant origin, including specified pectin containing powder - 1,0-3,0
Alkali - 1,5-3,0
Water - The Rest

 

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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.

SUBSTANCE: composition contains 0.05-2.5% of hydrophobic power, 0.05-10% of ethylene/vinyl acetate copolymer, and organic solvent. Composition intensifies oil production owing to increased effective radius of formation bottom area treatment, prevention of moistening inversion effect upon fall of hydrophobic agent concentration, and, consequently, decreased volume of simultaneously produced water.

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

2 tbl, 3 ex

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EFFECT: higher efficiency.

2 cl, 2 tbl

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes examination of operation well for gas-condensation and periodical cleaning of face-adjacent well area from precipitating hydrocarbon condensate by pumping hydrocarbon condensate solvent into bed, exposure of well for period of condensate dissolution and following removal of received solution from face-adjacent area during well launch, as solvent binary mixture is used with unlimited mutual solubility of components, while at least one of them has unlimited mutual solubility with hydrocarbon condensate, and relation of binary mixture components is determined from previously built phase diagram of three-component system, formed during dissolution of hydrocarbon condensate. As binary mixture with unlimited mutual solubility of components a mixture of acetone and methanol is used, or chloroform and methanol, or chloroform and aniline, or chloroform and acetone.

EFFECT: higher productiveness.

2 cl, 3 ex, 6 tbl, 2 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes placing water solution of carnallite ore, either modified, concentrated, or mixtures thereof, said solution is used at maximal for well temperature conditions concentration and is pumped in amount, necessary and enough for forming a hydraulic column in well shaft above ceiling of productive bed and along remaining shaft height well is filled with water up to mouth. Carnallite ore used has composition, in percents of mass: potassium chloride 20.5-21.5; sodium chloride 19.5-22.5; magnesium chloride 24.0-27.0; crystallization water 29.5-30.5. Modified ore has composition, in percents of mass: potassium chloride 23.0-29.5; magnesium chloride 31.8-46.0; crystallization water - the rest. Said water solution is prepared by dissolving ore in fresh technical water, drained from oil preparation plants, or in bed water. In case of dissolving in bed water, the latter is pumped from well at temperature 60-90°C. During perforation of well, value of technological liquid hydraulic column above productive bed ceiling is taken equal to (1.03-1.07)-(1.05-1.1)Pb, where Pb - productive bed pressure. Water solution of carnallite ore is used at density 1.23-1.37 t/m3. During use of said solution as working body of force wells it is used at density 1.05-1.20 t/m3, and solution also contains swelling inhibitor for argillaceous component of oil and gas bearing bed, like oxyethylenedendiphosphone acid, in amount 0.05-0.15% of used dissolved ore mass.

EFFECT: higher efficiency.

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