Insulation method of formation water inflow in well and lining method of bottom-hole formation zone

FIELD: oil and gas industry.

SUBSTANCE: in insulation method of formation water inflow in the well and lining method of bottom-hole formation zone, which involves pumping of mixture of silicon-containing substance with carbamide-formaldehyde concentrate or products on its basis, as silicon-containing substance there used is organic silicon substance or their mixture, or non-organic silicon substance at the following component ratio, wt %: silicon-containing substance 60.0-95.0, carbamide-formaldehyde concentrate or products on its basis 5.0-40.0. Method has been developed in dependent claims.

EFFECT: increasing water inflow insulation degree owing to creating high filtration resistances in porous medium and improving oil-sweeping properties of pumped compositions, and eliminating sand ingress.

6 cl, 4 tbl

 

The invention relates to the oil industry, in particular to methods of isolating the flow of formation waters in wells neftegazonosnyh layers, and to methods for the regulation of the profile of the injection well, to methods for the formation treatment, to methods for regulating the development of oil fields and to methods of fastening the bottom zone iskopaemaya wells, and can also be used to eliminate the leakage performance of the columns and create a porous filter.

The known method of isolation flooded reservoir, including the injection of polyfunctional alkoxysilanes organosilicon compounds, chloride polyvalent metal and water. Before injection of the composition into the reservoir pump hydrochloric acid with concentration up to 22% (A.S. No. 1808998, M CL 5, E21B 33/138, publ. 15.04.93, bull. No. 14).

There is a method of isolating the water in the well, comprising pumping a mixture of organosilicon compounds with hydrochloric acid as a hardener. During aging the mixture in the reservoir the gelation time determined depending on the specific capacity of the well (patent RU №2071548, M CL 6, E21B 33/138, publ. 10.01.97, bull. No. 1).

The disadvantages of methods are used to process the formation of large quantities of hydrochloric acid, which washes away the extra channels and peret the key, use as regulator curing flammable liquids, ethanol, toluene, acetone, and poor filterability of the injected compositions in porous media due to the rapid formation of gel particles polysilicon acid.

The known method of isolation permeable formation comprising pumping into the formation an aqueous solution of sodium polysilicate and gel, which is used as sulfamic acid, or hydrochloric acid, or calcium chloride (patent RU №2124124, M CL 6, E21B 43/32, publ. 21.12.98).

There is a method of development of the productive formation, including the injection of the silicate of an alkali metal and mineral water. Before injection of the solution of alkali metal silicate and salt water mix to a colloidal state (patent RU №2133825, M CL 6, E21B 43/22, publ. 27.07.99).

There is a method of limiting water inflow into the borehole, comprising the sequential injection well an aqueous solution of sodium silicate and hardener - hydrochloric acid to highly mineralized water potassium chloride type. Thus, before injection of the hardening agent into the well pump separator - light oil (patent RU №2121570, M CL 6, E21B 43/22, publ. 10.11.98).

The disadvantage of these methods is the use of only water-soluble silicates, resulting methods have OGRANICHENNOY the scope and weak gidrofobiziruyuschey the ability of the injected compositions and their weak oil-driving capability.

There is a method of isolation of the inflow of formation water into the well through the injection organosilicon - oligoorganosiloxanes (A.S. No. 861554, M CL 3, E21B 33/13, publ. 07.09.81, bull. No. 33).

There is a method of isolation of the reservoir, including the injection of synthetic resin brand CFMC, hardeners - Oksala CM and aluminum salts and water (patent RU №2272892, M CL 7 E21B 33/138, publ. 27.03.08, bull. No. 9).

The known method of fastening the bottom-hole zone, including the injection of urea resins, ammonium chloride, sodium nitrite and water (patent RU №2352764, M CL 7 E21B 33/138, publ. 10.12.08, bull. No. 11).

The known method of fastening the bottom zone of the well, including pre-injection of isopropyl alcohol, then mix it with phenol-formaldehyde resin, and then an aqueous solution of hydrochloric acid (patent RU №2387803, M CL 7 E21B 33/13, publ. 27.04.2010, bull. No. 12).

The known method of fastening the bottom zone of the well, including pre-injection of a mixture of resin and aluminium powder, and then an aqueous solution of hydrochloric acid (patent RU №2387806, M CL 7 E21B 33/138, publ. 27.04 2010, bull. No. 12).

The main disadvantages of the above methods are the difficulty and complexity of the technologies used to injection.

Closest to the proposed method is a way of isolating the flow of formation water into the well, which is injected into wells is a mixture 98,0 to 99.9 wt.% silicon-containing substance with 0.1-2.0 wt.% highly dispersed hydrophobic material (patent RU №2249670, M CL 7 E21B 33/138, publ. 10.04.2005, bull. No. 10).

The disadvantage of the above method is not sufficiently wide field of application it is mainly for isolation of formation waters in the wells and to regulate the development of oil fields.

The aim of the invention is the creation of more efficient and reliable way of isolating the flow of formation water into the well to create high fluid flow resistance in the porous medium and increasing oil-driving ability of the injected compositions, which would be both simple method of fastening layer zones to eliminate the problem of sand, the elimination of leakage in the production casing and create a porous filter that includes the injection of a composition containing the minimum number of components and having a very simple method of preparation and ease of injection.

The problem is solved in that way to isolate the flow of formation waters in the hole and fastening the bottom-hole formation zone, including injection into the layer of silicon containing material, characterized in that inject a mixture of silicon-containing substance with urea-formaldehyde concentrate or products based on it, as the silicon-containing substance use silicone substance or smesa or kremniiorganicheskie substance in the following ratio of components, wt.%:

Silicon-containing substance60,0-95,0
Urea-formaldehyde concentrate
or products based on it5,0-40,0

2. The method according to claim 1, characterized in that as a silicone substance use polyfunctional alkoxysilane organosilicon substances - substituted or full esters of orthosilicic acid, or organochlorosilane, or oligosaccharides, or a mixture of tetraethoxysilane with organochlorosilanes or oligoorganosiloxanes, or metaloorganosiloxans (titanosilicate - AKOR 100 or brand materials group AKOR bn - AKOR bn 100-104, AKOR bn 300).

3. The method according to claim 1, characterized in that as kremnijorganicheskogo substance use technical soluble silicates, including sodium silicates in the form of liquid glass, or polysilicate with silicate modulus of 2.1 to 6.5, or metasilicate.

The injected composition can optionally contain as oil-driving component poverhnosti-active substance or a mixture of them in the amount of 0.5-5.0 wt.%, the filler in the amount of 1.0-10.0 wt.%, and as the gasifier is 0,32-7.0 wt.% ammonium chloride and 0.41-8,96 wt.% sodium nitrite.

As the silicon-containing substance or a mixture of them use oil-soluble or water-soluble organosilicon substances or water-soluble or colloidal kremniiorganicheskie substances.

As oil-soluble organosilicon substance use organochlorosilane mixture tetraethoxysilane and organochlorosilane mixture tetraethoxysilane and ethoxyethylacetate, for example a mixture of oligoorganosiloxanes called "product 119-204 (TU 602-1294-84), ethyl silicate - 40 (ETS-40, GOST 26371-84) - homogeneous mixture preparation; or a complex mixture of tetraethoxysilane and preparation of ethyl silicate - 32 (ETS-32, THE 6-02-895-86); or silicone emulsion EC 20-03 (TU 6-0505763441-96-93) - 70%water emulsion polyethylsiloxane liquid PES-5, or polymer cement grade material AKOR B 100, modified tetrachloride titanium (TU 39-1331-88), or brand new materials group AKOR bn; AKOR bn 100-104, AKOR bn 300, manufactured NPF Nitpo", or silicone resin 139-297 - solutions polyphenylsiloxane resin in orthoxylene (TU 6-02-1-026-90) or polymethylphenyl siloxane resin 134-276 in hydrocarbon solvent (TU 602-1360-87), and as a water-soluble silicone substance or mixture use them, for example, gidrofobiziruyuschey silicone fluid NGL-11N IS IN 6-000491277-101-97) - an aqueous solution of potassium methyl siliconate or composition of ethoxysilane (TC 6-00 - 05763441-45-92), entitled "product 119-296 T".

As kremnijorganicheskogo substance use technical water-soluble or colloidal silicates, including sodium silicates in the form of a 30-percentage aqueous liquid glass or polysilicates with silicate modulus of 2.1 to 6.5, or metasilicate, or colloidal silicate or soluble hydrated silicates, such as metasilicates (TU 6-18-161-82), liquid high-modulus glass brand "Naftoli", produced by THE 2145-002-12979928-2001, or colloidal silicates of sodium brands "Sialic (TU 2145-010-43811938-97) and Sialic-30-5 (TU 2145-002-4381193897), "Kremstal KS-TM", or instant hydrated sodium silicate mark "Sialic-60-3 (TU 2145-004-43811938-99), or frost glass brand "Nomak (TU 2145-015-13002378-95), or a mixture of them.

As the urea-formaldehyde concentrate CPK use of urea-formaldehyde concentrate grades ck-80 and CPK-85 (TU 2223-009-00206492-98), produced by JSC "Togliattiazot"; brand CCF-1, produced by JSC "Tomsk petrochemical complex"; the brand UFC-85 - JSC "Metafrax"; brand CPK-M - CJSC "Karelia DSP"

As products based on formaldehyde concentrate use of urea-formaldehyde resin grades CPK-MT-20 (TU-2223-006-00206492-97) Sheksna plant, AFP-2, TC1 and COP-11 (TU 6-05-1375-80) JSC Sadogatake-fiber" brands CFMH (TU 6-06-59-89), CFG (GOST 14231-80), worked out-15 (TU 6-06-12-88), µf-50 (TU 1-10-664-79), KF-90 (TU 6-05-1785-83), KSM (TU 2223-003-335378-58-96), KF-35 (TU 6-05-1785-83), KF-40 (TU 6-05-1785-83), manufactured by CJSC "Himsintez"brand "Retail K-1 (TU 2221-637-55778270-2004), produced by JSC "Uralkhimplast" , Nizhny Tagil, brands CFG (GOST 14231) and KF-MT (TU 6-00-5763450-112-90), produced by JSC "Khimprom" , Volgograd and other cities.

As the surfactant used water-soluble and sadomasochistic surfactant or a mixture of them.

As water-soluble surfactants used anionic surfactants, such AS brand sulfonic acid, produced by THE 2481-004-48482528-99 at CJSC "Bursitis-M"or sulfonates of different brands, as well as water-soluble nonionic surfactants, for example neonol-12 - Nonylphenol, ethoxylated with 12 mol of ethylene oxide (AF-12), produced by TU-2483-077-05766801-98 at JSC Tatneft", or its commodity form SNO-3B and SNO-4D, or nonionic surfactants brand OP-10, or a mixture of anionic and nonionic water-soluble surfactant, for example, Neprinol VVD produced at CJSC "Himeko-GANGA" on THE other 2483-015-17197708-97.

In addition, as surface-active substance is a mixture sadomasochistic surfactant in the form of finished compositions, such as detergent preparations ML-80 BS (TU 2458-040-52412574-03), or ML-81B, containing a mixture of water-soluble anionic surfactant (23-28%) and non-ionic oil-soluble surfactant (12 wt.%) (THE 2481-007-50622652-99-2,002), produced by CJSC SPC "Bursi the MES-M and washing the product brand ML-super, manufactured by Delta-prom innovation", in Samara on THE 2383-002-51881692-2000.

As the cationic surfactant used repellent TRS-1, representing the Quaternary compound obtained by condensation of tertiary amine and benzylchloride, produced by THE 2482-006-48482528-89 at ZAO NPO "Bursitis-M" in the form of a transparent liquid with a mass content of active substance of at least 50%, soluble in water, alcohols and acetone, oil insoluble.

The filler used, for example, wood flour, GOST 16361-87, rubber crumb on THE 38-105590-84, mineral powders according to GOST 52129-2003, sulfur according to GOST 127.1-93, soot according to GOST 7885-86, atactic propylene according to GOST 23001-88, bentonite on THE 5751-002-58156178-2002, chalk, Portland cement according to GOST 1581-96, powders swollen and neftenbach polymers, powders of water-soluble polymers, hollow silica-alumina microspheres AFM brand MS-400/500 production company "Granule", highly dispersed hydrophobic materials, such as policy, Aerosil, white carbon black, talc, metal oxides.

As the gas developing agents used ammonium chloride according to GOST 2210-73 and sodium nitrite according to GOST 19906-74.

For the proposed method as the injected compositions, a mixture of silicon-containing substance with urea-formaldehyde concentrate or products based on it, as cu is misterioso substance use silicone substance or a mixture of them or kremniiorganicheskie substance.

Adding CPK or products based oil-soluble organosilicon substance education crosslinked silicone gel is the result of hydrolysis of oil-soluble organosilicon substances by broadcasting a silanol connection Si-OR and turning it into a water-soluble substance - siloxane, followed by polycondensation with formation water emulsion polysiloxanes.

When used in the reaction mass in the proposed method kremnijorganicheskogo substances, such as sodium silicate solution, adding CPK or products based on it is education monogrammable acid, which is unstable and undergoes polymerization, resulting in the formation of various composition and structure of polysilicon acid.

Using a solution of colloidal silica, which is a stable colloidal disperse system, adding a reference solution CPK or products based on it there is an integration of dispersed particles of colloidal silicate. As a result of coagulation of dispersed particles of the reaction mass becomes uniform gelatinous amorphous structure.

Urea-formaldehyde concentrate CPK or products based on it are composed of free formaldehyde, substituted methylol derivatives of m is chevigny, for example mono-, di-, tri - and tetramethylrhodamine, and also contains etilenglikol, polyoxyethyleneglycol and methanol.

In the original solutions CPK or products based on it at pH 7-8 all of the above components are in equilibrium state.

Methylol groups determine the solubility of urea-formaldehyde resins in water. When shifting the equilibrium of the environment in the range of pH less than 7, i.e. in the acidic zone, they form hydrogen bonds, causing the Association of molecules and the molecular mass growth and increase of viscosity.

Adding acid solutions in the UFC or products based on it, the balance is shifted in an acidic (pH less than 7), initiated by the condensation reaction and adhesion, which lead to the formation of resins. The chain growth of the oligomer occurs due to reactions gidroksimetil groups with the amino groups with the formation of the methylene groups (bridges), and the reaction gidroksimetil groups among themselves with the formation of the methylene groups (bridges).

The rate of formation of the resin depends on the stoichiometric ratio of the components, temperature and pH-value.

In many known methods of fastening of the bottom-hole zone (see analogues), where the injected compositions using sequential injection of various polymer solutions: phenol, carbs is formaldegidnym, acetonitrile and other resins, and then the injection of 10-15%solutions of acids, the processes described above.

As a result of and addition reactions of polycondensation in polymer solutions in an acidic environment increases the viscosity and curing resins.

By the present method, the reaction of formation of highly viscous polymer solutions occurs in an alkaline medium at a pH of more than 8.

All injected silicon solutions by the present method have an alkaline environment with a pH 11-14. Therefore, when mixing them with a solution of CPK or products based on it in an alkaline medium reacts with education chromogenic compounds Butlerov reaction. As a result of its flow formaldehyde molecules contained in the solution CPK or products based on it in large quantities (up to 50-60%), interact with each other in an alkaline medium with the formation of a communications system, characterized by increasing carbon chain. This leads to the synthesis of polyhydric alcohols, ketones, aldehydes, followed by the formation of sugars and their derivatives containing hexose, pentose, tetrose and other sugars. A catalytic effect in the reaction Butlerov possess hydroxide namelocation metals, such as silicon hydroxide present in the reaction mass.

In an alkaline medium at a pH of more than 8 formed products dimethylaniline links perhaps the formation of cyclic compounds and uronic triazine, oligopolistically. The above-mentioned reactions are formed of the molecular structure of different lengths and branching with high functionality methylol groups.

The formation of branching of molecules contributes to the high concentration of CPK three - and tetramethylrhodamine. Due to branching structures, which are characterized by a small length at a relatively high molecular weight, is the stage of gelation and cross-linking of the gel structures in the spatial-developed polymeric mesh.

In the injected compositions gelation and cross-linking of the gel structures takes place at high concentrations of components. The passage of deep reaction of crosslinking of the gel structures in further compression of the polymer grid until a homogeneous structure, hardening to stone.

The prototype in the cured silicon-containing substances and changes the wettability of the reservoir rock, namely increasing the hydrophobization of the surface rocks are increased filtration resistance in the porous medium. However, the filtration resistance created in a porous medium in the cured silicon-containing substances, are often insufficient for the English connections to the development of low-permeability stagnant and poorly drained areas of a layer.

By the present method the injected composition containing a mixture of silicon-containing substance and CPK or products based on it, provide a higher rheological parameters of injection compared to the compositions of the prototype (see tables 1 and 2).

When you add in the injected composition additionally the gas developing agents: ammonium chloride and sodium nitrite, a solid porous structure.

Studies have shown that polysiloxane, ethoxylation, alkylsilane and the polysilicon acid in the presence of CPK or products based on it have a high adsorption on the breed and can decorrelates without destruction. Therefore, after injection of the composition according to the present method, the components of the injected composition adsorbed on the rock and change the wettability of it, namely hydrophobizing surface as collectors, and the surface layer when creating a porous filter in the reservoir in the oil, water and gas wells, resulting in increased quality underground repair of wells.

When the injection of the injected composition hydrophobizing interval of the reservoir, and slowly migrate, forming the shaft of oil.

In the process of interaction of components of the injected composition with the surface of the particles of the breed is a complex exchange between the reactive group is AMI formed structures and absorbing complex fine part of the reservoir rock. Components of the injected composition containing a mixture of branched macromolecular structures derived CPK and products on their basis with high functionality methylol groups with silicon-containing substance are composed of two parts of the molecule. For example, a methyl group branched macromolecular structures derived CPK and products on their basis or siloxane group organosilicon substances with kremlinology communication, are hydrophilic polar and have the ability to interact with moisture (water) in the pores and on the surface of particles of the breed and its reactive particles. Methylol and kremlinology connection oriented towards the surface of the particles. Second part: hydrophobic, presents nonpolar hydrocarbon radicals, associated with macromolecular structures and silicon and insoluble in water. This part of the molecule creates a water-repellent layer. Hydrocarbon radicals are oriented in the direction from the surface of mineral particles of rock.

By the present method silicon-containing compounds have the ability to be combined with CPK or products based on it, for example, macromolecular structures, and organic resins, injection, which improves the surface properties of p is childbirth, for example strengthened weakly cemented sand and rocks when there is a problem of sand and improved fastening all of the bottomhole zone of the formation.

In addition, the sand, removal of cement aggregates and rocks in the wells with impaired strength properties of the production casing, which indicates the destruction of the lining of the casing of the productive formation.

Additionally, the currently known methods for attaching the bottom zone and challenging their use of technology does not effectively solve the problem of wrestling with sand. The main reasons for this problem - the lack of effectiveness of the fight against the sand, the low strength of the pinning zone, the complexity and the complexity of fastening technologies, insufficient turnaround time.

To solve the above-mentioned tasks the inventive method isolate the flow of formation waters in the hole and fastening the bottom-hole formation zone includes the injection of a wide spectrum of silicon-containing compounds: silicon or kremnijorganicheskih mixed with urea-formaldehyde concentrate or products based on it and other components.

In addition, to eliminate the problem of sand, the elimination of leakage in the production casing and the creation of a porous filter and what to use as the injected composition of the above mixture components with the addition of gas developing agents to form a homogeneous porous structure, hardening to stone.

By the present method as oil-driving component for increasing oil-driving ability of the injected compositions can optionally use the above surfactant or mixture of surfactants in the amount of 0.5-5.0 wt.%.

With the introduction of surfactant in the injected composition decreases the interfacial tension between the oil - surfactant composition, so it is easier to download songs, increases the cleaning ability and result in increased oil-driving ability of the injected compositions.

By the present method in the injected compositions can optionally add the above fillers, as well as facilitating additives and filler difficult to use hollow silica-alumina microspheres AFM brand MS-400/500 production company "Pellet" in the amount of 1-10 wt.%.

The injected composition according to the present method may contain a gas developing agents: ammonium chloride and sodium nitrite in an amount of 0.32-7.0 wt.% 0.41-8,96 wt.% accordingly, after the introduction of which the formation of gas-filled foam composition.

As a result of chemical reactions that proceed with the separation of nitrogen injected composition saturated with gas and become porous mass of low density, hardening to stone.

By the present method the injected compositions the AI is prepared.

When using sodium silicates of different brands: water-soluble or colloidal prepare the source 5-20%aqueous solutions of them, with stirring, add in the desired amount of the original solution CPK or products based on it and pumped into the well.

Oil-soluble and water-soluble organosilicon substance is mixed with solution of CPK or products based on it without dilution.

Since the reaction gelation and cross-linking of the gel structures in the spatial-developed polymer network in the injected compositions on the surface at low temperature is very slow, so the methods of preparation and injection of the compositions is very simple, and it is one of the important advantages of the proposed method.

Technology application the injected compositions according to the proposed method is injected into a reservoir at the rate of 0.5-50 m3to meter the thickness of the layer and their displacement from the wellbore into the formation of injected water for injection wells or dry oil for oil wells, the excerpt in the reservoir within 12-36 hours and putting the well into operation for oil wells and water injection to injection wells.

For injection wells of the composition into the formation to reduce the capacity of the well by 30-50%.

For oil wells composition composition Zack is more into the reservoir for carrying out insulation works to limit water production in oil wells, that leads to an increase in oil production for each well-operation with a simultaneous decrease in water production.

To determine the effectiveness of the injected compositions according to the proposed method and the prototype in water and oil-saturated reservoirs were conducted filtration test.

Example 1. In the proposed method the injected compositions contain 60,0-95 wt.% silicon-containing substance or a mixture of them and 5.0-40.0 wt.% CPK or products based on it (see table 1.1 and 1.2).

In addition, the injected composition may additionally contain a filler, such as synthesis 10, 15, and 16 contain the filler in the amount of 1.0-10.0 wt.%, but, for example, the synthesis of 10, 12 and 14 contain the gas developing agents in the amount of 0.32-7.0 wt.% ammonium chloride and 0.41-8,96 wt.% sodium nitrite.

To filter the proposed composition prepared in advance is supplied shirts for temperature control of the column of stainless steel with a length of 220 mm and an inner diameter of 32 mm, which is filled with a mixture containing weakly cemented sandstones, which are unevenly separated by layers of dense differences siltstones and clays. Models under vacuum saturated with water, thermostatic at 90°C, the weight method to determine the initial permeability of the cores of fresh water, which was 10.50-18,20 μm2(K1). Then the proposed composition is filtered on Phil the traditional setting to determine the permeability reduction. To this end pumped through the column one pore volume of the proposed compositions. After this column, incubated at 90°C for 6 hours to gel formation. Then pumped through the core three pore volume of water.

After that, determine the water permeability (K2). Reduction of permeability in % is determined by the change of the core permeability on the water before and after priming compositions: K1/K2·100%.

The results of the filtration tests are presented in table 1.1. and 1.2.

Example 2. The prototype pump compositions containing 98,0 to 99.9 wt.% silicon-containing substance or a mixture of them, and 0.1-2.0 wt.% highly dispersed hydrophobic material.

The prototype filter prepared composition through water-saturated column on the installation of filtration (see Example 1). With this aim through the column calcined one pore volume of the compositions of the prototype.

After this column, incubated at 90°C for 6 hours to gel formation. Then pumped through the core three pore volume of water.

After that, determine the water permeability (K2). Reduction of permeability in % is determined by the change of the core permeability on the water before and after priming compositions: K1/K2·100%.

The results of the filtration tests are presented in table 1.1.

Example 3. The proposed method C is kakivaya compositions contain 60,0-95 wt.% silicon-containing substance or a mixture of them and 5.0-40.0 wt.% CPK or products based on it (see table 2).

In addition, the injected compositions additionally contain surfactants, such as the synthesis of 2, 4, 5, 8, 10, and 14 contain a surfactant in the amount of 0.5-5.0 wt.%, and synthesis 10, 15, and 16 contain the filler in the amount of 1.0-10.0 wt.%, and the synthesis of 10, 12 and 14 contain the gas developing agents in the amount of 0.32-7.0 wt.% ammonium chloride and 0.41-8,96 wt.% sodium nitrite.

In the proposed method the prepared composition is filtered through a rich oil Cairn with residual water saturation, 23-36% filtration plant with the purpose of increasing the permeability of the reservoir oil.

Prepared for filtering cores from stainless steel with a length of 220 mm and an inner diameter of 32 mm fill with the above mixture. Models under vacuum saturated with water, the weight method to determine the initial permeability of the cores on the water, then the core is saturated with oil and determine the residual water saturation, and permeability of oil, which amounted to 23-36,0% and 6.14-10,30 μm2(K1) (modeling the processing of oil-saturated zone of the formation). Pumped through the column two pore volume of the prepared composition. After this column, incubated at 90°C for 6 hours to gel formation. After that determine the permeability of oil (K2), pumping three pore volume of the core oil. The increased permeability in % is determined by the change in the permeability is of NRN oil before and after pumping composition: K 2/K1·100%.

The results of the filtration tests are presented in table 2.

Example 4. The prototype pump compositions containing 98,0 to 99.9 wt.% silicon-containing substance or a mixture of them, and 0.1-2.0 wt.% highly dispersed hydrophobic material.

The composition of the prototype filter through rich oil Cairn on the installation of filtration with the purpose of increasing the permeability of the reservoir oil (see Example 3), two pumping of pore volume of the composition. After this column, incubated at 90°C for 6 hours to gel formation. After that determine the permeability of oil (K2) pumping three pore volume of the core oil (simulation processing of oil-saturated zone of the formation). The increased permeability in % is determined by the change of the core permeability on oil before and after pumping composition: K2/K1·100%.

The results of the filtration tests are presented in table 2.

Example 5. In the proposed method the injected compositions contain 60,0-95 wt.% silicon-containing substance or a mixture of them and 5.0-40.0 wt.% CPK or products based on it (see table 3).

In addition, the injected compositions additionally contain surfactants, such as the synthesis of 2, 4, 5, 8, 10, and 14 contain a surfactant in the amount of 0.5-5.0 wt.%, and synthesis 10, 15, and 16 contain the filler in the amount of 1.0-10.0 wt.%, and the synthesis of 10, 12 and 14 mA is t gas developing agents in the amount of 0.32-7.0 wt.% ammonium chloride and 0.4-8,96 wt.% sodium nitrite.

The proposed composition is filtered through washed oil-saturated core filtration plant (simulation processing rinsed with water saturated zone thickness) to increase oil-driving ability of the composition in terms of Tootmine of residual oil on the linear model for the homogeneous reservoir.

The linear model is described by a stainless steel column. The column is filled to the above mixture. The model under vacuum saturated with water, the weight method to determine the permeability of the water column.

After that in the model under pressure is pumped oil until until exit appears clean (without water) oil, determine the initial oil saturation, which is 64.3-76,8%. In the filtration works use natural oil density 842 kg/m3and a dynamic viscosity of 8.5 MPa·s at 20°C. the Initial displacement is performed with water (three pore volume) and determine the ratio of oil displacement by water. After this model two filter pore volume of the prepared composition. After this column, incubated at 90°C for 6 hours to gel formation. Then filtered three pore volumes of water, determine the growth rate and total fertility rate of oil displacement.

The filtering results of the compositions are by definition capable of oil-driving the minute they are presented in table 3.

The technical result of the invention is to provide an efficient method for the isolation of the flow of formation waters in the hole and fastening the bottom-hole formation zone, which includes the injection of a mixture of silicon-containing substance with urea-formaldehyde concentrate or products based on it and other components in the injection which creates high filtration resistance in the porous medium to isolate the flow of formation waters, as well as increased oil-driving ability of the injected compositions by changing the wettability of the reservoir rock to connect to the development of stagnant and poorly drained areas of the reservoir. After injection of the compositions strengthened weakly cemented rocks when there is a problem of sand and improved fastening all of the bottomhole zone of the formation.

In the above mixture components add additional surfactant, filler and gas developing agents to form a homogeneous porous structure, hardening to stone.

The proposed method is used to isolate water production in oil wells and for attaching the bottom-hole formation zone, and can also be used for profile control injectivity of injection wells, treatment of the reservoir and to regulate the development of oil fields.

Through the use of wide spectra components in the injected compositions and a wide range of concentrations of components used in the composition of the proposed method can be used to create a porous filter in the reservoir oil, water and gas wells, for the elimination of leakage in the production casing, annular space and eliminate the problem of sand.

Table 1.1
The results of filtering compositions for the purpose of lowering the permeability of water-saturated reservoirs
№ p/pThe name of the methodContent, wt.%Permeability μm2The decrease of permeability, K1/K2, 100%
Silicon-containing substanceCPK or products based on itBefore treatment, K1After processing, the K2
markQtymarkQty
1234567 89
1DeclareACORN-10096,0Ck-804,010,504,46235
2DeclareETS-3295,0Ck-805,010,803,37320
3The placeholderETS-3299,9UGM-Aerosil0,1010,964,54241
4DeclareSialic 30-590,0UFC-8510,0of 11.152,50446
5% solution
5DeclareSialic 30-585,0UFC-8515,012,541,92653
10% solution
6Declareother 119-20480,0CCF-120,013,850,851629
7Declareother 119-296 T70,0CPK-M30,015,450,334681
8 DeclareSialic 60-360,0UFC-8540,018,20No filter-
15% solution
9The placeholderSialic 60-399,0UGM - Policy1,015,205,42280
15% solution
10DeclareAKOR bn-300samples 88,27Ck-MT-2010,014,85 3,00495
11The placeholderAKOR bn-30098,5UGM - talc1,513,654,47305
12DeclareETS-40of 79.65KPMG15,012,76to 1.86684
13The placeholderETS-4098,0VGM the titanium oxide2,010,65with 3.27325
14DeclareNomak68,6UF-5020,011,380,601871
a 20% solutionis the
15DeclareTBE 20-0380,0Rezaul K-115,011,60of 1.57737
16DeclareNaftoli, 10% solution80,0TS-110,012,562,12592

-
Table 1.2
The results of the filtering compositions containing additional components, for the purpose of lowering the permeability of water-saturated reservoirs
№ p/pThe name of the methodThe additional content, wt.%Permeability μm2Pangeni the permeability, K1/K2, 100%
fillerthe gas developing agentsBefore treatment, K1After processing, the K2
markQtyNH4ClNaNO2
123456789
1Declare----
2Declare----
3The placeholder- ---
4Declare----
5Declare----
6Declare----
7Declare----
8Declare- ---
9The placeholder----
10DeclareWood flour1,00,320,4114,853,00495
11The placeholder----
12Declare2,353,012,76to 1.86684
13The placeholder---
14Declare5,06,411,380,601871
15DeclareThe titanium oxide5,011,60of 1.57737
16DeclareMicrospheres of the ACM10,012,562,12592

Table 2
The results of filtering compositions to improve reservoir permeability, saturated with oil residual saturation 23-36%
№ p/pThe name of the methodContent, wt.%Permeability μm2Increase pronice-
bridges, K2/K1, %
Silicone substanceCPK or products based on itPAVbefore treatment, K1after processing, the K2
markQtymarkQtymarkQty
12345678101112
1DeclareACORN-10096,0Ck-80 4,0--6,146,50106
2DeclareETS-3294,5Ck-805,0The TRS-10,57,738,81114
3The placeholderETS-3299,9UGM - Aerosil0,10--7,307,95109
4DeclareSialic 30-589,0UFC-8510,0OP-101,08,45of 11.15132
5% solution
5DeclareSialic 30-583,0UFC-8515,0ML-super2,09,0413,19146
10% solution
6Declareother 119-20480,0CCF-120,0--8,5811,49134
7DeclareAve. 119-296 T 70,0CPK-M30,0--9,3412,90138
8DeclareSialic 60-3of 57.5UFC-8540,0Neprinol VVD2,57,1411,06155
15% solution
9The placeholderSialic 60-399,0UGM - Policy1,0--to 6.808,56126
15% solution
10DeclareAKOR bn-30085,27Ck-MT-2010,0ML-80 BS3,010,0216,33163
11The placeholderAKOR bn-30098,5UGM - talc1,5--a total of 8.7411,36130
12DeclareETS-4075,65KPMG15,0ML-super4,010,3017,30168
13The placeholderETS-4098,0UGM - titanium oxide2,0--7,6310,30135
14DeclareNomak63,6UF-5020,0ML-81B5,08,0913,99173
a 20% solution
15The placeholderEC-20-0380,0Rezaul K-115,0--9,4217,05 181
Naftoli
16Declare10% solution80,0TS-110,0--8,2513,03158

Table 3
Oil-driving ability of the compositions
№ p/pThe name of the methodContent, wt.%The initial oil saturation
ness, %
The ratio of oil displacement
Silicon-containing substanceThe FC or products based on it PAV
on the watergrowthtotal
markQtymarkQtymarkQty
123456789101112
1The placeholderACORN-10096,0CPK4,0--64,30,630,160,79
2DeclareETS-3294,5CPK5,0Neon is l-12 0,565,10,630,210,84
3The placeholderETS-3299,9VGM Aerosil0,10--66,50,620,190,81
4DeclareSialic 30-589,0UFC-8510,0OP-101,064,00,640,240,88
5% solution
5The home is aemy Sialic 30-583,0UFC-8515,0ML-super2,068,60,630,270,90
10% solution
6Declareother 119-20480,0CCF-120,0--65,50,630,260,89
7DeclareAve. 119-296 T70,0CPK-M30,0--6,8 0,630,270,90
8DeclareSialic 60-3of 57.5UFC-8540,0Neprinol2,564,50,630,280,91
15% solutionVVD
9The placeholderSialic 60-399,0VGM policy1,0--69,50,630,240,87
15% solution
10DeclareAKOR bn-30085,27Ck-MT-2010,0ML-80 BS3,070,70,620,300,92
11The placeholderAKOR bn-30098,5VGM talc1,5--65,60,620,260,88
12DeclareETS-4075,65KPMG15,0ML-super4,068,00,63 0,300,93
VGM oxide
13The placeholderETS-4098,0titanium2,0--73,20,620,280,90
Nomak
14Declarea 20% solution63,6UF-5020,0 ML-81 B5,072,50,630,300,93
15DeclareEC-20-0380,0Rezaul K-115,0--of 76.80,630,310,94
16DeclareNaftoli80,0TS-110,0--76,30,620,280,90

1. The way to isolate the flow of formation waters in the hole and fastening the bottom-hole formation zone, including injection into the layer of silicon containing material, characterized in that inject a mixture of silicon-containing substance with urea-formaldehyde concentrate or products based on it, as the silicon-containing substance use silicone substance or mixture of them, or to amninianism substance in the following ratio of components, wt.%:

Silicon-containing substance60,0-95,0
Urea-formaldehyde concentrate
or products based on it5,0-40,0

2. The method according to claim 1, characterized in that as a silicone substance use polyfunctional alkoxysilane organosilicon substances - substituted or full esters of orthosilicic acid, or organochlorosilane, or oligosaccharides, or a mixture of tetraethoxysilane with organochlorosilanes or oligoorganosiloxanes, or metaloorganosiloxans - titanosilicate - AKOR 100 or brand materials group AKOR bn - AKOR bn 100-104, AKOR bn 300.

3. The method according to claim 1, characterized in that as kremnijorganicheskogo substance use technical soluble silicates, including sodium silicates in the form of liquid glass or polysilicate with silicate module 3.0 to 6.5, or metasilicate, or colloidal silicates.

4. The method according to claim 1, characterized in that as the oil-driving component is injected surfactant or a mixture of them in the amount of 0.5-5.0 wt.%.

5. The method according to claim 1, characterized in that Sukacheva the statutory composition additionally contains a filler in an amount of 1.0-10.0 wt.%.

6. The method according to claim 1, characterized in that the injected compositions additionally contain as a gas developing agents 0,32-7.0 wt.% ammonium chloride and 0.41-8,96 wt.% sodium nitrite.



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: suspension to be used in oil and gas wells, which contains the following components: aluminium silicate source, carrying fluid, activator of the group including metal silicate, metal aluminate, alkaline activator or their combinations. At that, suspension is capable of being pumped with the composition with such rheological properties that its viscosity is 300 CP or less, and suspension can be cured in well conditions.

EFFECT: obtaining geopolymer suspensions with possibility of monitoring the thickening and hardening periods of time for wide temperature intervals and density, which are capable of being pumped and used for well cementing.

43 cl, 11 tbl, 4 ex

FIELD: oil industry.

SUBSTANCE: the method for formation acid treatment includes detecting zones of various openness in the treated formation, injecting a portion of hydrochloric acid solution into the higher openness zone, subsequent squeezing of viscous fluid based on oil by the hydrochloric acid solution with a surface-active agent, squeezing of the hydrochloric acid with the surface-active agent into the lesser openness zone in cyclic mode, extraction of used hydrochloric acid from the well at the final cycle, furthermore, the concentration of hydrochloric acid is reduced with every cycle of its application.

EFFECT: increased method efficiency caused by improving durability of insulating screen while reducing its production cost, expanding formations treated by the method along the formation depth and width, simplified treatment process.

17 cl, 2 tbl, 1 ex, 1 dwg

FIELD: mining.

SUBSTANCE: the invention relates to method of well bore maintenance in an underground formation, and to cement composite used for well bore maintenance in an underground formation. The method of well bore maintenance in an underground formation includes preparation of cement composite containing water, cementing material and gas hydrates inhibitor, and placement of the said cement composite into the well bore. The cement composite used for well bore maintenance in an underground formation contains water, cementing material and gas hydrates inhibitor.

EFFECT: production of cements with new composition.

21 cl, 2 ex, 3 tbl

FIELD: oil and gas industry.

SUBSTANCE: insulation method of water influx to production oil wells involves pumping of gel-forming compound prepared by introducing the carbamide to polymer-colloidal complex obtained by mixing of water colloidal solution of aluminium pentahydroxochloride with 0.2÷0.3 wt % of water solution of polymer; at that, as polymer there used is weakly charged cationic polyelectrolyte with molecular weight of 6·106-20·106 and content of cationic groups of 1.65 to 9.20% molar.

EFFECT: increasing oil production owing to reducing water content of extracted products.

4 tbl, 5 ex, 1 dwg

FIELD: gas and oil production.

SUBSTANCE: method involves sulphur injection into one or more wellbores inside operation perimetre in a bed with minimum operation area permeability of 0.1 Darcy, and at least a part of sulphur should be able to move towards the bed parts with temperature below sulphur melting point, so that suplhur would solidify in the bed and form a barrier. Area adjoining wellbores is heated above sulphur melting point but below hydrocarbon hydrolysis temperature, further heating is stopped to cool the bed down in natural way so that sulphur solidifies in the bed. Method of barrier forming in bed involves heating of a bed part adjoining several wellbores to raise bed temperature near wellbores to a point above sulphur melting point but below hydrocarbon hydrolysis temperature, sulphur injection to the bed through at least some wellbores and ensuring sulphur movement from wellbores towards the bed parts with temperature below sulphur melting point so that suplhur solidifies in the bed and forms a barrier.

EFFECT: increased insulation efficiency.

20 cl, 2 dwg

FIELD: gas and oil production.

SUBSTANCE: ecologically pure not hardening pill is used for tamping annular space of casing string. Spherical cavities uniformly distributed by volume are arranged in the pill. Also, mechanical matrixes are tempered in a not yet hardened pill. Matrixes consist of an internal part with closed porosity and an external part with open porosity at ratio of corresponding volumes of parts within range from 90:10 to 99:1. Application of non-hardening pill instead of not freezing one prevents drinkable water bearing horizons from hydrocarbon impurities.

EFFECT: application of matrix of cheap foam glass in non-hardening pill instead of use of expensive refrigerating installations, thermostats and double casings in surface equipment and in structure of direction and conductor of hole.

3 cl

FIELD: gas and oil production.

SUBSTANCE: procedure consists in lowering string into well into zone of water inflowing pay, in pumping backfilling solution prepared of bitumen with filler through string into well and in forcing string through into water inflowing pay. Also, as filler there is used cement and additionally high viscous bitumen at amount of 5-20 wt % or high viscous oil of volume of bitumen-cement solution determined depending on a geologic-physical characteristic of the pay. Before pumping into the well and depending on occurrence depth of the water inflowing pay backfilling solution is heated to temperature as high, as 70-80°C. Solution is pumped through the string of heat insulated pipes under the mode of alternating pressure at maximal pressure not exceeding pressure of hydraulic outbreak above the located pay. Also, after water insulating operations production of the pay is withdrawn in a cyclic mode with start up into operation for 2-3 days and shut down for the same time as many as three times, if intake capacity of the pay exceeds 500 m3/day.

EFFECT: improvement of procedure.

5 cl, 1 dwg

FIELD: oil and gas production.

SUBSTANCE: procedure for restraint of water production in well consists in pumping solution of CL (cultural liquid) into insulated interval. Two equal portions are pumped. The first portion corresponds to solution of CL prepared on soft water of 1000 kg/m3 density at ratio 1:0.5-1, while the second one corresponds to solution prepared on reservoir mineralised water of density up to 1190 kg/m3 at ratio 1:0.3-0.5.

EFFECT: raised efficiency of repair-insulation operations due to creation of more resistant to water outbreak screen of water solutions of silicon-organic liquid - CL with controlled period of gelation excluding their preliminary hardening.

3 tbl

FIELD: oil and gas production.

SUBSTANCE: procedure consists in simultaneous effecting permeable walls of well borehole with scrapers for removal of filtration crust and with high-pressure jets generated from hydro-monitored heads of mud injector during well bottom hole deepening with drilling. Also, hydro-jets are directed at angle towards each other, they converge at one point on the wall of the well and destroy their nuclei, thus preventing destruction of walls of the well and formation of cavities. Well walls are subjected to the similar effect when the well is treated before lowering a producer for cementing. Drill agent containing dispersed solid particles is used as fluid for high-pressure hydraulic jets.

EFFECT: raised efficiency of mud fill, reduced expenditures for emergency-recovery operations and time for construction of well.

2 cl, 2 dwg

FIELD: oil and gas production.

SUBSTANCE: composition contains carbamide-formaldehyde resin, acid hardener and filler. As hardener there is used resorcin and ferro-chrome-lignosulphonate, and as filler there is used carbon white CW-120 or talk, or rubber powder, or chalk at the following ratio of components, in weight shares: carbamide-formaldehyde resin 100; resorcin 7-15, ferro-chrome-lignosulphonate - FCLS-M 1.5-25, filler 3-8.

EFFECT: reduced water loss of backfilling solution and increased strength and adhesion characteristics of cured composition.

2 cl, 1 tbl, 20 ex

FIELD: oil and gas production.

SUBSTANCE: invention relates to grouting mortars used for cementing casing pipes of gas, gas-condensate, and oil wells complicated by presence of formations with low hydraulic rupture pressure as well as presence of permafrost rocks. Light-weight grouting mortar contains 47.0-60.0% special-type cement, 6.6-11.8% clinoptilite as light-weight additive, and water. As a result, casing-pipe annulus incidents during boring and running wells are avoided owing to improved parameters of grouting cement, in particular increased sedimentation stability of mortar, dimensional stability and needed strength of cement stone at low positive and negative temperature in early hardening stages are achieved at simultaneous lowering of grouting mortar density.

EFFECT: improved performance characteristics of grouting mortar.

1 tbl

FIELD: oil and gas chambers construction.

SUBSTANCE: method includes pumping of portion of water-absorbing acryl polymer, exposure of it in a well, pumping of second portion of same polymer, tempered on fresh water with concentration 1-20%, buffer of fresh water dries up, and before and after pumping of second portion of water-absorbing polymer, tempered on hydrocarbon liquid with concentration 10-20%, buffer of hydrocarbon liquid is pumped in, besides, said 2-portion systems are pumped into well multiple times.

EFFECT: higher efficiency.

1 ex

FIELD: oil and gas production.

SUBSTANCE: invention provides grouting composition intended for selective insulation of water inflows into wells, including those occurring under low-temperature and high-permeation oil reservoirs, as well as for suppressing lost-circulating zones and brine inflow zones. Composition including product of hydrolytic etherification of chlorine-containing phenyltrichlorosilane still residues with aqueous alcohol solution contains, more specifically, product obtained by hydrolytic etherification of 100 wt parts of indicated residues with 10-32,8 wt parts of 90-93% aqueous alcohol solution in presence of 10-40 wt parts of orthosilicic acid ethyl ester and, additionally, 15-35 wt parts of chlorine-containing phenyltrichlorosilane still residues at summary content of the two components 133.2-161.6 wt parts. Grouting composition may further contain up to 16.8 wt parts of polar solvent.

EFFECT: lowered repair operation cost, enabled utilization in a wide formation temperature range, including that in high-permeation and low-temperature oil reservoirs, and prolonged shelf time of grouting composition.

2 cl, 1 tbl

FIELD: oil extractive industry.

SUBSTANCE: method includes pumping, in carrying liquid - waterless mixture of oil products containing waterless oil, of powder-like water-soluble polymer and connector in amount of 0.05-0.2% for mass of carrying liquid or 30-100% for mass of power-like water-soluble polymer, as said mixture a mixture of waterless oil and light oil products processed in relation 0.1:9.9-9.9:0.1 is used, and as connector - dry aluminum nitrate, chrome nitrate, iron nitrate, magnesium nitrate, barium nitrate, calcium nitrate or their mixtures.

EFFECT: higher efficiency.

2 tbl

FIELD: oil extractive industry.

SUBSTANCE: method includes pumping, in carrying liquid - waterless mixture of oil products containing waterless oil, of powder-like water-soluble polymer and connector in amount of 0.05-0.2% for mass of carrying liquid or 30-100% for mass of power-like water-soluble polymer, as said mixture a mixture of waterless oil and light oil products processed in relation 0.1:9.9-9.9:0.1 is used, and as connector - dry aluminum acetate, chrome acetate, iron acetate, magnesium acetate, copper acetate, barium acetate, manganese acetate, calcium acetate or their mixtures.

EFFECT: higher efficiency.

1 tbl

FIELD: oil extractive industry.

SUBSTANCE: method includes pumping, in carrying liquid - waterless mixture of oil products containing waterless oil, of powder-like water-soluble polymer and connector in amount of 0.05-0.2% for mass of carrying liquid or 30-100% for mass of power-like water-soluble polymer, as said mixture a mixture of waterless oil and light oil products processed in relation 0.1:9.9-9.9:0.1 is used, and as connector - dry aluminum sulfate, chrome sulfate, iron sulfate, magnesium sulfate, copper sulfate or their mixtures, or their alums with common formula MIMIII(SO4)

.2
12H2O, where MI-Na,K,Pb,Cs,NH4, and MIII-Al,Cr,Fe,Mn.

EFFECT: higher efficiency.

2 tbl

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes feeding water-isolating compound along tubing pipes, containing polyvinyl spirits and consisting of components forming an impenetrable zone in case of mixing in the bed, pressing it into bed, washing and exposure of well for forming of impenetrable zone, tubing column is lowered for 2-3 meters below perforation range, and into isolation range along tubing pipes hydro-repelling liquid is first pumped, in volume, exceeding volume of water-isolating composition in at least two times, water-isolating composition includes special liquid except from polyvinyl spirits, its pumping is performed in sequence - first goes polyvinyl spirits, then buffer liquid, special liquid, buffer liquid, repeating these operations until reaching required height of isolation interval and fixing of well-adjacent area, after that said pressing, washing of well and said polymerization exposure are performed.

EFFECT: higher efficiency.

1 dwg, 1 ex

Plugging mix // 2245989

FIELD: oil and gas production.

SUBSTANCE: plugging mix intended for cementation of oil, gas, and gas condensate wells under moderate and elevated temperatures contains 50-76% Portland cement, 20-40% finely ground quartz, and caustic magnesite powder.

EFFECT: reduced filtration and shrinkage of plugging mortar.

1 tbl

FIELD: oil and gas production.

SUBSTANCE: Portland cement-based composition contains, wt %: polymer 1-10, hardening accelerator 6-8. plasticizer 0.3-0.5, alumina cement 7-10, gypsum dihydrate and/or anhydrite 5-8, said polymer being selected from the group comprising: polyacrylamide, hydrolyzed polyacrylonitrile, polyvinyl alcohol, organosilicon liquid, latex and cationic bitumen emulsion, and said hardening accelerator being alkali or alkali-earth metal sulfates or chlorides.

EFFECT: improved properties, reduced shrinkage deformations, and under conditions resistance to fissuring.

2 cl, 2 tbl

FIELD: mining engineering, in particular improving of reservoir recovery.

SUBSTANCE: claimed composition contains (mass parts): resin 100; liquid curing agent (e.g., alkali solutions) 15.1-60; ammonium carbonate 0.1-9.9. Composition of present invention afford the ability to limit the water and sand inflow, to increase strength and permeability of formed reservoir.

EFFECT: improved reservoir recovery, increased turnaround time, reduced underground equipment in well.

2 tbl, 4 ex, 2 cl

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