Composition for oil

 

The invention relates to the oil industry, in particular, to the development of oil wells, and can be used for the insulation layer in the development of irrigated oil deposits, resulting in enhanced oil recovery. The technical result is an improvement of plugging properties due to the homogenization of the system while increasing afterithaca, limiting water production and increase adhesion to the carbonate and terrigenous rocks. The composition of the oil, including oil as the base and the rubber further comprises a vulcanizing agent is sodium diethyldithiocarbamate in the following ratio, wt.h.:oil - 100, rubber - 3-15, vulcanizing agent and 0.06 to 0.75, whereas the rubber composition may contain a synthetic isoprene rubber stamps SKI-3S and SKI-3, or natural rubber. 2 C.p. f-crystals, 10 PL.

The invention relates to the oil industry, in particular to the development of oil wells, and can be used for the insulation layer in the development of irrigated oil deposits, resulting in enhanced oil recovery.

Known composition for the isolation of the reservoir containing oil, latex, amaltal (see speakers With whom emote, which contains a polymeric material, a mutual solvent, a surfactant, and a liquid medium (see U.S. patent No. 4476931, IPC E 21 In 33/138).

However, these compounds have a characteristic for polymeric materials disadvantages - the tendency to salustiano that reduces over time, their rheological properties. In addition, both the composition contain toxic and flammable organic solvents.

Also known composition containing wt.%: oil 64-66, crumb rubber 13-15, filled with gasoline granulated faience 20-22 (see speaker of the USSR №717285, IPC E 21 In 33/138).

The presence of granular faience reduces its elasticity, which makes plugging of pores in the layer. The part is expensive. Besides, earthenware filler undergoes emergency sedimentation, which complicates the operation of the plugging composition. The composition contains easily flammable liquid petrol.

Closest to the composition of the invention is a composition for oil containing oil as the basis and isoprene rubber (see RF patent №2081310, publ. 10.06.1997).

The disadvantage of this composition is a limitation not only of water but also afterithaca; the heterogeneity of the composition, creating the impossibility of penetration by solid is s; and not enough high adhesion plugging system to carbonate and terrigenous rocks, which increases the likelihood of ratanasirivilai during well operation.

The objective of the proposed solutions is to improve plugging properties due to the homogenization of the system while increasing afterithaca, limiting water production and increase adhesion to the carbonate and terrigenous rocks.

The problem is solved in that the composition of the oil, including oil as the base and the rubber further comprises a vulcanizing agent is sodium diethyldithiocarbamate in the following ratio, wt.h.: oil - 100, rubber - 3-15, vulcanizing agent and 0.06 to 0.75, whereas the rubber composition may contain a synthetic isoprene rubber stamps SKI-3S and SKI-3, or natural rubber.

The method of preparation of the composition is a mixture of listed components used within the specified limits and the exposure of this mixture to swelling and dissolution of rubber (full or partial) in the oil. This process is carried out at a temperature of 50-60°C for 2-10 hours.

When applying this composition should be after pumping it into the well to withstand pressure 0,179 and the formation of the reticulated structure of the elastomer solution in oil.

Choice as the elastomeric matrix of synthetic rubber was determined by the criterion of volume swelling.

Experimental data for the determination of the criterion of volume swelling for different types of rubbers are shown in table.1.

High volumetric swelling properties have rubber: on BNR brand SKN-18, the best choice AMIS, isoprene rubber stamps: SKI-3, SKI-3S, and butyl rubber stamps Bq. The maximum swelling properties have rubber SKI-3, SKI-3S, as well as natural rubber; in addition, these rubber stamps have partial solubility in oil, which is a favorable factor for homogeneous systems with mesh structure.

In order to predict the behavior of rubber at elevated temperatures, which can be implemented at different depths in the wells, in parallel with the swelling properties and the solubility was determined by the melting temperature of various rubbers, which are presented in the table.2.

Thus, for oil cement compositions are optimal rubber SKI-3, SKI-3, since they have the highest volumetric swelling properties, better solubility in oil and the lowest melting temperature.

Other types of rubbers are sravnitelnim option is natural rubber, which has high heat resistance (melting point 190°C) and good solubility and swelling properties in oil.

To determine the optimal concentration of rubber SKI-3S and SKI-3-in-oil, in which the grouting composition is in a liquid (viscous flow) and does not contain a solid phase, were studied composition with concentration of isoprene rubber in oil 3, 5, 7, 10, 15 wt.parts per 100 wt. parts of oil at t=60°C. the Criterion for complete dissolution was homogeneity (uniformity) of the mass, see table.3.

Compounds 1 and 2 remained for a long time liquid after swelling and dissolution and did not generalise as a result of interaction of the rubber components with oil. Compounds 3 had a higher viscosity than 1 and 2, the swelling and dissolving them occurred more slowly. However, full melirovanie (loss of fluidity) was not observed. Compounds 4 both rubbers after a three-hour exposure in their oil was viscous, and after 10 hours the trains were Tagliavini. Compounds 5 after a three-hour exposure rubbers in oil behaved in the following way: at the bottom of the vessel is formed gel, and the top forms a solid mass. Under stirring, the mass is distributed throughout the volume, but after some time the oil again rejects the AET and the system is therefore not HeliRussia.

On the basis of the obtained experimental data were selected synthetic isoprene rubber stamps: SKI-3S and SKI-3, providing after their introduction into the oil effective swelling, dissolution and melirovanie. Similar behavior was found and a solution of natural rubber containing 95-97% isoprene rubber, oil.

The choice of the vulcanizing agent to provide melirovanie system was conducted on the sample of rubber SKI-3S. Vulcanizing agents were administered together with sulphur and sulphur-free.

The task was ensuring melirovanie (curing) in the wells of t=60°C. the Percentage of rubber in the oil was the same (10%), all components in the system were made simultaneously with the rubber. To ensure melirovanie systems were experimentally investigated various vulcanizing agents used in the manufacture of rubber products: sulfur, altax, captax, thiuram, sulfenamid zinc, diphenylguanidine, sodium diethyldithiocarbamate. All the vulcanizing agents were first introduced into the system together with sulfur, as prescribed by the technological requirements of production of rubber and ebonite. Experimental data for these systems are presented in table.4.

As widn is l itself tioram. System, which was introduced sulfenamid, diphenylguanidine, only 10 hours later acquired the same properties that thiuram showed already after 3 hours. System altacom, katakam and sodium diethyldithiocarbamate was not Tagliavini even for 504 hours (21 days).

Hence we can conclude that, as a vulcanizing agent process melirovanie in combination with sulfur, it is advisable to enter tioram.

In parallel with the systems, which were introduced sulfur, were experimentally investigated compositions which were made the same vulcanizing agents in the same quantities as in the presence of sulfur. The results are presented in table.5.

From the data presented in the table.5, it is seen that among all tested vulcanizing agents, the most effective was thiuram and sodium diethyldithiocarbamate. The sodium diethyldithiocarbamate in the absence of sulfur also has a hardening effect. Altax and captax in both cases are almost the same indifferent properties, i.e. after exposure 504 hours these systems has not Tagliavini. Diphenylguanidine in both cases showed the same properties as in the presence of sulfur, and without it: system diphenylguanidine after 10 hours exposure just starting out is: when a 10-hour exposure system was in a plastic condition. In the presence of sulfur system with sulfenamid zinc with a 10-hour exposure was beginning to heliroute (see tab.4).

Based on the above conclusions can be drawn: if the system entered vulcanizing agents together with sulfur, it usually shows the inhibitory effect on the curing process. The process of melirovanie in cement systems without sulfur faster.

The optimal action in the kinetic aspect at a temperature of 60°C has tioram. The process of melirovanie neftekamskoy grouting system with turama occurs in the period from 3 to 10 hours (see table.5), which is quite acceptable in the production conditions of the wells. Not excluded the possibility of using sodium diethyldithiocarbamate.

To create neftekamskoy system based on mineral oils for various fields checked the compatibility of the rubber SKI-3S with oils of different fields: Saratov, Zhirnovsky (Volgograd oblast), Samara, Zhiguli and Akushkincky. Studied systems containing rubber 3 and 10 wt. parts. In a system with 3 wt. parts of the rubber was not present vulcanizing agents. Data for these systems are presented in table.6. Studies were conducted at t=60°C.

From the data table.6 krasnyh oils remain in the liquid state. Even after prolonged exposure (504 h) system has not Tagliavini.

Were tested oil cement compositions containing rubber stamps SKI-3S in the amount of 10 wt.parts and found significant differences compared to cement compositions containing rubber in an amount of 3 wt. part at t=60C. the Data from these experiments are presented in table.7.

The data table.7 show that the Saratov oil field immediately splits into 2 phases: water gathers at the bottom and top of the oil. Thus, the grouting composition exhibits a bright pronounced hydrophobic properties. Compositions based on oils Zhirnovsky and Samara fields behave in a similar manner, i.e. through 168 hours one part was zaselyalas, and the other remains at the bottom in a liquid state. Oil Zhiguli field shows more viscous properties than oil from other fields.

Oil Zhiguli field is quite suitable for the establishment of the oil cement compositions. For the production of Neftegazodobycha cement compositions on the basis of Saratov, Zhirnovsky, Samara, Zhiguli oils, apparently, requires a higher concentration of rubber and removing sulfur from the composition of Volkovo on the basis of Saratov and Zhirnovsky oils were carried out additional experiments the results are presented in table.8.

From table. 8 it follows that the Saratov and Zhirnovsky oil from the point of view of obtaining cement composition behave roughly the same way: the optimum quantity of rubber is 10-15 wt. parts. For Akushkincky oil the optimal concentration of the rubber is 5-10 wt. parts.

Cement compositions was studied on the model of the formation (sandstones) to study the influence of the composition of reagent # 1 (Saratov oil deposits + rubber + vulcanizing agent) and # 2 (oil Akustische field + rubber + vulcanizing agent) on vodonepronitsaemost breed. The results of these studies are presented in table.9 and 10.

Studied composition: oil Yakushkina + rubber + vulcanizing agent. Data analysis allows you to create the grouting composition based rubber SKI-3S, any oil field and vulcanizing agent turama: oil - 100, rubber - 10, thiuram - 0.5 wt.h, which will work satisfactorily and at room and at elevated temperatures and has a reasonable kinetic parameters of swelling, dissolution and melirovanie.

The temperature increase during the manufacture of cement composition is only possible to 50-60°C. At these temperatures the processes: from fire and environmental considerations, although at greater depths (1.5 to 3 km) temperature increase while decreasing the pressure this composition can also be used.

Universal composition for optimal speed processes of swelling, dissolution and melirovanie grouting systems regardless of the oil should also be considered:

Oil 100

Rubber SKI-3 (SSI-3, NC) 10

Diethyldithiocarbamate 0.5

The proposed composition allows for the possibility of ratanasirivilai well under pressure, to accelerate the process of plugging and ratanasirivilai, to limit water production and improve nefterinok, to improve adhesion to the rocks.

Claims

1. The composition of the oil, including oil and rubber, characterized in that it further comprises a vulcanizing agent is sodium diethyldithiocarbamate in the following ratio, wt.h.:

Oil 100

Rubber 3-15

Specified vulcanizing agent is 0.06 to 0.75

2. Composition under item 1, characterized in that as it contains rubber, synthetic isoprene rubber stamps SKI-3S and SKI-3.

3. Composition under item 1, characterized in that as it contains rubber natural rubber.

 

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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.

EFFECT: increased efficiency of maintaining formation pressure and thereby oil recovery of formation due to leveled displacement front and reduced probability of the rupture of formation rock backbone, and simplified control of phase state of gas-liquid fringe by changing pressure of pumped acid solution portions.

8 cl

FIELD: oil and gas production.

SUBSTANCE: invention aims at increasing productivity of oil- and gas-producing and injecting wells exposing high-temperature low-permeable oil reservoirs. In the treatment method according to invention including forcing enzyme substrate and separate enzyme into formation and creating conditions to enzymatically convert substrate into acid, geologic and productive characteristics for each interval of bottom zone are determined in order to pick out low-permeable intervals of oil reservoir for treatment, whereupon properties of enzyme substrate and separate enzyme as well as conditions for their pumping are chosen. Substrate utilized in the method is head fraction of methyl- and/or ethyl-, and/or butyl acetate production, to which aliphatic alcohols are added, and enzyme is an acid solution. Substrate is pumped simultaneously and/or before, and/or after pumping of enzyme, after which well is closed for some time and then opened and placed under predetermined operational conditions.

EFFECT: enhanced efficiency of acid treatment due to increased phase permeability for oil and deepness of active acid-treated zone of low-permeable oil reservoirs.

25 cl, 1 tbl, 3 ex

FIELD: oil and gas production.

SUBSTANCE: invention is intended for use during development of oil pools at different waterflooding phase for intensifying functioning of producing wells and increasing current oil recovery of formation. Composition contains, wt %: liquid hydrocarbon 10.0-20.0, oil-soluble surfactant 0.3-5.0, water-soluble or water-oil-soluble surfactant 0.1-1.0, superfine hydrophobic material 0.1-2.0, and water (the rest). Composition may further contain 0.3-5.0% calcium chloride. Oil recovery is increased owing to hydrophobization of formation structure, reduction of surface tension in water/rock/oil phase boundary, increase in detergent power of polluted surface, increase in composition viscosity, and increase of relative permeability of the formation for hydrocarbon phase as compared with water phase.

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

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes drilling product and force wells, forcing gas and water through force wells into separate zones of productive bed and extraction of hydrocarbons from product wells, forming separate gas, water and hydrocarbon saturated areas with major contents of respectively gas, collected therein for later use, water and hydrocarbons, periodical pumping of collected gas from formed gas saturated zones to water saturated zones, periodical pumping of water to gas saturated zones is performed. It is possible to pump collected gas to water saturated zones in form of gas-water mixture. It is possible to pump in passing gas of current deposit. It is possible to pump hydrocarbon or non-hydrocarbon gas from other sources. It is possible to pump water with admixture of specifically selected chemical reagents or compositions thereof. When gas content in water saturated zones reaches from 0.1 to 28% from water content in water saturated zones it is reasonable to generate resilient waves with frequency within range from 0.0001 to 45 KHz and amplitude within range from 0.02 to 2.8 MPa. It is reasonable to pump gas and water to separate areas of productive bed with concurrent generation of resilient waves in there with frequency within range from 0.0001 to 45 KHz and amplitude within limits from 0.02 to 2.8 MPa.

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7 cl, 5 dwg

FIELD: oil extractive industry.

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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.

1 cl, 4 ex

FIELD: oil industry.

SUBSTANCE: method includes treatment of face area of oil bed by hydrophobic agent in organic solvent and pressing oil from collector with following delivery of oil from face area of product well for treatment of oil terrigenic bed, in form of hydrophobic agent solution of ethylene copolymer with vinylacetate in ethylbenzol or fraction thereof is used in relation 1:1 - 10, treatment of face area is performed with following ratio of components, in percents of mass: ethylene copolymer with vinylacetate 0.05-2.0, ethylbenzol or fraction 0.05-20.0, organic solvent - the rest.

EFFECT: higher efficiency.

2 tbl, 2 ex

FIELD: mining industry and alternative fuels.

SUBSTANCE: coal is affected by methanogenic consortium of microorganisms with culture medium utilizing continuous pumping of culture medium through wells and tank wherein methanogenic consortium of microorganisms with culture medium is placed. Tank is installed on the surface above wells and pumping of culture medium from the bottom of tank through methanogenic consortium of microorganisms. Process produces biogas and coal-water fuel.

EFFECT: increased yield of biogas to continuously effecting culturing of microorganisms.

1 dwg, 2 tbl

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