The method of regulating the permeability oil reservoir

 

(57) Abstract:

The invention relates to the oil industry. The technical result is to increase the efficiency of the permeability reduction watered collector by increasing the ability to seal the injected agents. In the method of regulating the permeability of a petroleum reservoir by injection through the injection well prepared with stirring at 20°C for 1-5 days mixture of clay suspension with a concentrated aqueous solution of an alkaline reagent and jacking mineralized water are injection: up to this mixture is prepared with stirring at a temperature of 50-90C for 2 days in a mixture of clay suspension with a concentrated aqueous solution of an alkaline reagent, and after this mixture insulating rim of clay suspension. Moreover, the specified injection is carried out at a volume ratio cooked at a temperature of 50-90C and cooked at a temperature of 20C. these mixtures, equal to from 1:4 to 4:1. 1 C.p. f-crystals, 4 PL.

The invention relates to the oil industry, in particular to a method of regulating the permeability oil reservoir waterflooding for the preliminary injection of clay suspension in a mixture with an alkaline reagent and saline water (U.S. Pat. OF THE RUSSIAN FEDERATION NO. 2086758, IPC6E 21 In 43/22, 1997). However, the method does not provide education to the maximum number of sediment in situ.

The closest to the technical nature of the claimed invention is a method of regulating the permeability of a petroleum reservoir by consecutive injection via the injection well a pre-prepared mixture of clay suspension with an aqueous solution of caustic soda and mineral water (U.S. Pat. OF THE RUSSIAN FEDERATION NO. 2167279, IPC7E 21 In 43/22, 2001). However, such processing of clay suspension with a solution of caustic soda does not provide a high degree of blockage flooded collector.

The objective of the invention is to increase the efficiency of the permeability reduction watered collector by increasing the ability to seal the injected agents.

The problem is solved in that in the method of regulating the permeability of a petroleum reservoir by injection via the injection well is pre-prepared with stirring at 20°C for 1-5 days mixture of clay suspension with a concentrated aqueous solution of an alkaline reagent and jacking mineralized water exercise C is linistea suspension with kontsentrirovannym aqueous solution of an alkaline reagent, and after this mix - insulating rim of clay suspension. Moreover, the specified injection is carried out at a volume ratio cooked at a temperature of 50 to 90°C and cooked at a temperature of 20°With the above mentioned formulas, equal to from 1:4 to 4:1. Processing clay suspension with concentrated aqueous solutions of caustic soda and/or liquid glass at elevated temperatures (50 to 90°C) leads to the increase of the formation of water-soluble silicates, respectively, of the volume of sediment in contact with mineralized water in most of the flooded reservoir. Subsequent injection of a mixture of clay suspension and an alkaline reagent, seasoned within 1-5 days at temperatures close to 20°C, immerses you in less permeable collector. This way of downloading allows you to increase the depth of the impact of displacing agent and the proportion of the displaced oil.

In our experiments we used the following reagents: bentonite (GOST 25795-83), caustic soda (GOST 2263-79) and liquid glass (GOST 13078-81)

Comparison of known and proposed methods conducted on the results of laboratory experiments to determine the volume of sludge generated by mixing the treated school is maralitang water and treated alkaline suspension and field test results.

Example 1

A mixture of 100 ml of caustic soda, 42% concentration, 300 ml of 20% clay suspension and 100 ml of 28% liquid glass is treated for 5 days at a temperature of 20°C and at elevated temperatures from 20 to 90°C for 2 days. 100 ml of the treated alkaline suspension is stirred with 200 ml of saline formation water density 1167 kg/m3standing still for 4 hours. The volume of sediment was determined by the upper meniscus gel-like mass, or bottom edge of the clarified solution.

The results are shown in table. 1, it is seen that the processing of the clay suspension caustic soda up to 90°With the volume of sludge generated with mineralized water, increases 1.7-3.5 times. The greatest growth in sediment is observed at temperatures of 50 to 90°C. Further increase in temperature causes loss of water by evaporation. The relative increase in the volume of sediment occurs at high concentrations of caustic soda. Adding to the dispersion liquid of the glass and increasing the concentration of bentonite allows you to reach large amounts of precipitate formed.

Example 2

Experiments on the filtration of alkaline clay suspension was performed go from quartz sand fractions of 0.05-1,20 mm The cores were saturated saline formation water density 1167 kg/m3. Processed at the corresponding temperature alkaline clay slurry is pumped into the core by isolating 10 ml with distilled water before and after rims suspension. In Kern was pumped insulating the rim with 10 ml of distilled water, followed by 100 ml of alkaline clay suspension, the second insulating the rim with 10 ml of distilled water. The process of precipitation simulated by injecting 200 ml of saline water. The permeability of the cores was determined before the first insulating rims and after sedimentation mineralized water. The results are shown in table. 2.

With increasing temperature processing of clay suspension caustic soda growth bridging properties of the mixture in a sequential filtering it with mineralized formation water through bulk artificial core. The most effective reduction in permeability occurs in the temperature range from 40 to 90°C in this interval bridging ability alkaline clay suspensions increases with 51-57% to 72-81%, i.e. 1.3-1.4 times.

The optimal duration of high-temperature processing GSA ability of the suspension (PL. 3).

Sequential injection of alkaline clay suspensions treated at a temperature of 70 and 20°C, allows to achieve a higher degree of blockage of the cores. With increasing volume of the suspension, kept at 70°C, the decrease of permeability of the sample. The maximum reduction in permeability (93-97%) is obtained at a volume ratio of alkaline suspensions treated at a temperature of 20 and 70°C, 30 ml : 70 ml Optimal limit volumetric ratios can be accepted from 1:4 to 4:1 (table. 4).

Example 3 (the prototype).

In the area of oil-bearing horizon WITHbbvia the injection well is pumped a mixture of 8 m320% clay suspension and 6 m342% caustic soda prepared by mixing at a temperature of 20°C for 5 days. The mixture was selling 16 m3mineralized water density of 1170 kg/m3. The alkaline solution from the waste water is isolated 1 m3clay suspension. Well stop for 72 hours to respond, then go into the work. Of the three surrounding wells for 12 months additionally produced 420 tonnes of oil. The volume of produced water decreased 3120 m3.

The UP> clay suspension and 5 m342% caustic soda prepared by mixing at a temperature of 80°C for 2 days. The mixture is then pumped 3 m3clay suspension and 3 m3caustic soda prepared by mixing at a temperature of 20°C for 5 days. Alkaline solutions from saline water isolated 1 m3clay suspension. Reagents and insulating the rim pressed 16 m saline water density of 1170 kg/m3. Well stop for 72 hours to respond, then go into the work. From two nearby wells for 12 months additionally produced 680 tonnes of oil. The volume of produced water decreased 5230 m3.

Example 5. In the area of oil-bearing horizon WITHbbvia the injection well pump a mixture of 8 m320% clay suspension and 8 m3liquid glass prepared by mixing at a temperature of 20°C for 5 days. A mixture of isolate 1 m3clay suspension and forced 16 m3saline water density of 1170 kg/m3. Well stop for 72 hours to respond, then go into the work. Of the two surrounding wells for 12 months additionally extracted 480 t nepentabbvia the injection well is pumped a mixture of 5 m320% clay suspension and 5 m3liquid glass prepared by mixing at a temperature of 80°C for 2 days. It pumped a mixture of 3 m3clay suspension and 3 m3liquid glass prepared by mixing at a temperature of 20°C for 5 days. The mixture is first pressed 1 m3clay suspension, followed by 16 m3saline water density 1170 m3. Well stop for 72 hours to respond and put into service. Of the three surrounding wells for 12 months additionally extracted 768 tonnes of oil, the volume of produced water decreased 5850 m3.

Comparison of the proposed method sequential injection of clay suspension prepared at a temperature of 50 to 90°C and 20°With a concentrated aqueous solution of an alkaline reagent, with the known method, shows increasing ability to seal the injected agent in laboratory conditions 1.5-1.8 times. In field conditions additional oil production increased 1.6 times the volume of produced water is reduced to 1.7-2.0 times. The technology does not require the creation of new equipment and may be anago reservoir by injection through the injection well prepared with stirring at 20°C for 1-5 days mixture of clay suspension with a concentrated aqueous solution of an alkaline reagent and jacking mineralized water, characterized in that are injected to the above-mentioned mixture is prepared with stirring at a temperature of 50-90C for 2 days in a mixture of clay suspension with a concentrated aqueous solution of an alkaline reagent, and after this mixture insulating rim of clay suspension.

2. The method according to p. 1, characterized in that the specified injection is carried out at a volume ratio cooked at a temperature of 50-90C and cooked at a temperature of 20C. these mixtures, equal to from 1:4 to 4:1.



 

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FIELD: oil and gas production.

SUBSTANCE: invention provides a method of developing oil pool allowing production of oil from water-rich oil reservoir under difficult geological-tectonic conditions in the last development stage. In the method, neutral salt of carbonic acid and acid solution are forced into formation through injecting well with water generated in gas-liquid fringe created in formation. After pumping of neutral salt of carbonic acid, acid solution is pumped by portions alternating with water pumping. Before pumping of acid solution portions beginning by at least second portion, selective insulation of high-permeable formation intervals is performed. Aforesaid neutral salt of carbonic acid utilized is sodium carbonate aqueous solution or aqueous suspension of calcium carbonate and aforesaid acid solution is aqueous hydrochloric acid solution. Selective insulation of high-permeable formation intervals involves use of freshly prepared controllable viscoelastic composition containing water-soluble acrylic polymer, cross-linking agent, thermal stabilizer, surfactant, and water. Summary concentration of acid solution is determined from concentration of neutral salt of carbonic acid on the base of stoichiometric proportions.

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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.

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