Solid-phase composition for hydrogen sulfide neutralization

FIELD: gas and oil production industry.

SUBSTANCE: invention relates to chemical compositions used in treatment of holes, among them absorbing holes, for decreasing hydrogen sulfide content in gaseous space in carrying out repairing, research and other works. Invention proposes a solid-phase composition for hydrogen sulfide neutralization that comprises the following components, wt.-%: surfactant, 0.5-7.4; polyvinyl acetate, 26.6-5.7 and water glass, 2.6-4.6 as reagent-stabilizing agents of foam, and sodium nitrite and sulfamic acid taken in stoichiometric ratio with respect to each component in reaction with hydrogen sulfide, the balance. Proposed composition can be used in gas and oil production industry under normal and low seam pressures. Invention provides development of effective and simple in preparing and technological composition used in neutralization of hydrogen sulfide in holes, enhancing neutralizing activity of hydrogen sulfide neutralizing agent with respect to hydrogen sulfide in seam space both in gaseous and dissolved state.

EFFECT: improved and valuable properties of composition.

6 tbl, 1 ex

 

The invention relates to chemical compositions for treatment of wells, including absorbing, to reduce the hydrogen sulfide content in the gas space of the wells in repair, research or other work. Can be used in the oil and gas industry under normal conditions and low reservoir pressure.

Widely known compositions for chemical binding of hydrogen sulfide in the wells, which is an aqueous solution of neutralizing agents [1, 2] or suspensions [3, 4]. As the neutralization reagents are frequently used products of interaction of alkanolamines with aldehydes, hydroxides of alkaline and alkaline-earth metals, aqueous suspension of the oxides of manganese (IV) and iron (III).

The main disadvantage of the use of neutralizing agents in the form of solutions and suspensions is a low speed and a small degree of binding of hydrogen sulfide due to the low dispersion of the catalyst of hydrogen sulfide and a small area of contact between catalyst of hydrogen sulfide with hydrogen sulfide in the well bore. In addition, neutralization of hydrogen sulfide solutions of neutralizing agents are not effective in terms of absorbing wells and low formation pressures, when the solution of the neutralizing reagent is spent in absorbing horizons without making useful the th work on the binding of hydrogen sulfide.

Known solid-phase composition obtained by mixing a urea-formaldehyde resin, surface-active substances (surfactants) and reagent (reagents) - neutralizer sulfide [5 - prototype]. Curing urea-formaldehyde resin foam leads to the formation of utverzhdenii gas-liquid - foam - system (OGIS), which is injected into the reservoir with the manifestations of hydrogen sulfide. The urea-formaldehyde resin is also a reagent-foam stabilizer. The large surface of the granules foam provides increased dispersion and increased area of contact of the catalyst of hydrogen sulfide with hydrogen sulfide in the injected volume OGGS and in the wellbore.

The composition is difficult to make, are not sufficiently effective and technologically advanced processing production wells due to the necessity to use special equipment (pump, tanks, dispensers, ejector) for the formation of neutralizing hydrogen sulfide EGGS; the probability of clogging of the bottom-hole formation zone of water-insoluble pellets of foam.

Solved by the invention of the task and the expected technical result consists in developing a more effective, simple to prepare and technological composition for neutralization of hydrogen sulfide in the wells. Eliminates the need to use etiologi equipment for the formation of neutralizing hydrogen sulfide EGGS (pump, tanks, dispensers, ejector). Provides enhanced neutralizing activity of the catalyst of hydrogen sulfide relative to hydrogen sulphide, which is well in space as in gaseous and dissolved form. The effectiveness of neutralizing hydrogen sulfide reagent compared with the prototype increases due to the greater surface contact with the borehole fluids with dispersed gas uncured foam system.

The problem is solved in that the solid-phase composition comprising neutralizing the hydrogen sulfide reagents, surface-active substances (SAS) and reagent-foam stabilizer, characterized in that the neutralizing hydrogen sulfide reagent contains sodium nitrite and sulfamic acid, and as a reagent stabilizing foam polyvinyl acetate and liquid glass in the following ratio, wt.%:

Surfactants from 0.5 to 7.4;

the polyvinyl acetate (PVA) from 2.6 to 5.7;

liquid glass from 2.6 to 4.6;

sodium nitrite and sulfamic acid in a stoichiometric ratio with respect to each other in the reaction with hydrogen sulfide - the rest.

The lower limit of the content of surfactant in the composition is 0.5 wt.% due to the value of the critical micellization concentration (CMC) of surfactants, flow solid-phase composition and flow of water on its dissolution (from 100 to 2000 DM3 ). The upper limit of the content of surfactant in the composition of 7.4 wt.% due to the high cost of surfactants and the need for high capacity, the composition of the sulfide. As surfactants can be used, for example, sodium lauryl sulfate or sulfonic acid.

The range of content in the composition of polyvinyl acetate (PVA, THAT is an aqueous suspension with a dry matter content not less than 52 wt.%) from 2.6 to 5.7 wt.% due: the minimum content of the first appearance stabilizersa foam properties; the maximum is the technology of preparation of solid-phase composition with the use of a suspension of PVA in water.

The range of content in the composition of the liquid glass from 2.6 to 4.6 wt.% due: the minimum content of the first appearance stabilizersa foam properties; the maximum is the technology of preparation of solid compositions using liquid glass, representing GOST thick liquid.

Raw material for solid-phase compositions are substances produced by the chemical industry by the relevant state Standards and Technical conditions, are shown in table 1. Characteristics of the raw materials in table 2-5.

Table 1
Raw materials and regulatory documents (ND) for the production of a composition
is the SubstanceFormulaND
1Sodium nitriteNaNO2GOST 4197-74
2Sulfamic acidH2NSO2OHTHE 2121-278-00204197-2001
3The polyvinyl acetateTHE 2242-033-45860602-2004
4Surfactant sodium dodecyl sulfateC12H25OSO2ONaTHE 6-09-64-75 or THE 6-09-37-1146-91
5Liquid glassNa2SiO3*nH2OGOST 13078-81

Table 2
Characteristics of sulfamic acid in THE 2121-278-00204197-2001
No.Name of indicatorThe norm on LP
1Appearancewhite crystals
2Mass fraction of sulfamic acid,%, not less than86
3Mass fraction of sulfate ion, % not less than6,0

Table 3
is harakteristiki sodium nitrite according to GOST 4197-74
1. Appearancewhite crystals with a yellowish or grayish tint
2. Mass fraction of NaNO2, %, not less than98,5
3. Mass fraction of water-insoluble substances,%, no more0,01
4. Mass fraction of chlorides Cl%0,01
5. Mass fraction of sulfate (SO4,%0,02
6. Mass fraction of heavy metals Pb, %0,001
7. Mass fraction of iron Fe%0,001
8. Mass fraction of potassium,%0,01

Table 4
Characteristics of the polyvinyl acetate in THE 2242-033-45860602-2004
No.Name of indicatorThe normal ID
1Appearancewhite mass without lumps
2Mass fraction of dry residue, %, not less than52
3The viscosity of the adhesive mug Navy, sec, not less than10
4Resistance to delamination, n/cm, not less than25
5The tensile-shear, MPa, not less than 4,4
6The frost resistance of the adhesive at a minus 40°C, number of cycles, not less than6

Table 5
Characteristics of sodium lauryl on THE 6-09-64-75
No.Name of indicatorThe norm on LP And
1Appearancethe white powder
2Mass fraction of sodium salt euryceros acid %98,5-101,0
3Solubility in watertested
4the pH of a 0.01 molar solution in water5,0-7,5

Table 6
Characteristics of liquid glass according to GOST 13078-81
No.Name of indicatorNormal gradeNorma brand
1Appearancethick liquid yellow or gray without mechanical impurities and inclusions
2Mass fraction of silicon dioxide22,7 is 29.624,3 is 31.9
3 Mass fraction of iron oxide and aluminum oxide, %, max0,250,25
4Mass fraction of calcium oxide, %, max0,200,20
5Mass fraction of sulfuric anhydride, %, max0,150,15
6Mass fraction of sodium oxide, %of 9.3 to 12.8of 8.7 to 12.2
7Silicate module2,3-2,62,6-3,0
8Density, g/cm31,36-1,451,36-1,45

All components are solid compositions are solid water-soluble substances; accordingly, the inventive solid-phase composition is soluble in water. It is prepared just prior to the processing of wells, which is served by flushing its technical water, for example, using the unit of CA-320.

The authors of the proposed technical solution is established that sodium nitrite in the presence of sulfamic acid oxidizes the hydrogen sulfide.

The increased dispersion and increased area of contact between the solid-phase composition with hydrogen sulfide are provided by the process of gassing beginning when contacting with water the solid phase composition, and the presence of surfactants and the camera is of catalysts foam - PVA and liquid glass. The effectiveness of neutralizing hydrogen sulfide reagent compared with the prototype increases due to the greater surface contact with the borehole fluids with dispersed gas uncured foam system.

The combination of processes of gasification and neutralization of hydrogen sulfide by dissolving the composition in water provides the efficiency and workability of the composition, characterized also by the ease of preparation. This, in turn, provides simplifying and improving the efficiency and technology of neutralization of hydrogen sulfide in the well.

Foam system with a catalytic Converter, hydrogen sulfide is formed directly when dissolved in water solid phase composition of the following composition:

Sulfamic acidof 36.4 40.7 in wt.%
Sodium nitrite51,0-to 57.0 wt.%
PAV0.5 to 7.4 wt.%
PVA2,6-5.7 wt.%
Liquid glass2,6-4.6 wt.%

where the specified ratio in the composition of sodium nitrite and sulfamic acid is stoichiometric with respect to each other.

Contact solid composition with water leads to the initiation of the reaction and outgassing:

NaNO2+(NH2)SO2OH=NaSO 4+N2↑+H2O

The contact of the aqueous solution of solid-phase composition with hydrogen sulfide leads to the initiation of the reaction neutralize him:

4NaNO2+2(NH2)SO2OH+3H2S=2Na2SO4+3N2↑+3S+6H2O

Oxidation of hydrogen sulfide to an intermediate oxidation - sulfur provides improved specific capacity of the composition in relation to hydrogen sulphide, and therefore reduced cost for processing well.

The proposed method allows you to completely bind the hydrogen sulfide dissolved in the formation water, oil and gas space of the well, to significantly increase the activity of the catalyst compared to gaseous hydrogen sulfide due to the large contact surface uncured foam system.

The invention is illustrated by the following example.

Example.

Production well No. 11810 NGDU "Yamashneft" JSC APK "Tatneft" has a static water level at a depth of 414 m from the wellhead. The content of hydrogen sulfide in the annular gas is of 2.21% (volumetric). Dissolved hydrogen sulfide in the well fluid 190 mg/DM3. Annulus pressure of 1.3 ATM.

Before renovations through the annular valve into the well received 5 kg of solid-phase composition containing 0,37 kg surfactant (7.4 wt.%), 0,13 kg PVA (2.6 m is S.%), 1,82 kg sulfamic acid (36,4 wt.%), 0,13 kg of liquid glass (2.6 wt.%), 2,55 kg sodium nitrite (51 wt.%).

The amount of water supplied should be minimal and sufficient for full flow of the composition into the well. Test results on 10 kg of solid-phase composition should be from 50 l (summer) up to 100 l (winter) technical water.

After the filing of the composition, the well was shut down for 1 hour for reaction. After 1 hour, the collected sample gas from the annulus. The hydrogen sulfide in the gas is not detected. Next on the well dismantled plan-washer and conducted chute-lift operations associated with the replacement pump. Control of the concentration of hydrogen sulfide analyzer "Ancat-7631" 0.5 metres from the open mouth of the well showed his absence throughout the renovation.

Sources of information

1. The Fakhri put A.M., R.A. Fakhri put the cleaning Method of oil and gas condensate from hydrogen sulfide. RF patent №2118649, C10G 29/20, C10G 29/24, publ. 1998.

2. The Fakhri put A.M., R.A. Fakhri put, Belkin M.M. Method of purification of liquid hydrocarbon fractions from hydrogen sulfide and mercaptans. RF patent №2107085, C10G 29/24, publ. 1998.

3. Potapov A.G., Sherman ETC. officials A.I., Anan'ev A.N. The method of processing drilling mud. Auth. mon. No. 1253980, SC 7/00, publ. 1986.

4. Kogan B.C., Kotov, A.V., Buyanova NS, Beltukova T.M., Dzhienbaev S., Kitaev A.D. Way to remove hydrogen sulfide. Auth. mon. No. 154294, B01D 53/02, publ. 1990.

5. Lame M.A., Figures A.A. Way of neutralization and isolation manifestations of hydrogen sulfide. Auth. mon. No. 1368427, EV 37/00, publ. 1988.

Solid-phase composition comprising neutralizing the hydrogen sulfide reagents, surfactant - surfactant and reactant-foam stabilizer, characterized in that the neutralizing hydrogen sulfide reagent contains sodium nitrite and sulfamic acid, and as a reagent stabilizing foam polyvinyl acetate and liquid glass in the following ratio, wt.%:

PAV0,5 - 7,4
the polyvinyl acetate2,6 - 5,7
liquid glass2,6 - 4,6
sodium nitrite and sulfamic acid
in the stoichiometric ratio
relation to each other in the reaction with
hydrogen sulfiderest



 

Same patents:

FIELD: gas and oil production industry.

SUBSTANCE: invention relates to chemical composition used in treatment of holes, among them, absorbing holes, for decreasing the content of hydrogen sulfide in gaseous space in carrying out repairing, research and other works, and can be used in gas and oil production industry under conditions of normal and low seam pressures. Proposed composition comprises the following components, wt.-%: sodium peroxocarbonate, 10-40; surfactant (surface-active substance), 0.5-10; polyacrylamide, 0.02-0.1; sulfamic acid, 17-53, and sodium nitrite, 21-52. The slid-phase composition can comprise water glass also. Invention provides development of effective and simple in preparing and technological composition used for neutralization of hydrogen sulfide in holes.

EFFECT: improved and valuable properties of composition.

2 cl, 7 tbl, 2 ex

FIELD: oil and gas extracting industry.

SUBSTANCE: invention relates to damping holes in their overhaul repair. Proposed technological liquid used in damping oil and gas holes comprises the following components, wt.-%: microbial xanthane biopolymer, 0.5-2.0; modified starch, 0.2-2.5; surfactant (surface-active substance), 0.01-0.2; sodium carbonate, 0.1-1.0; aluminum power, 0.005-0.08, and water, the balance. Method for preparing indicated aphron-containing technological liquid used in damping oil and gas holes involves mixing its components to obtain two solution wherein one solution contains sodium carbonate and surface-active substance obligatory, and other solution contains aluminum powder. Mixing these solution is carried out at temperature from 50°C to 90°C. Invention provides preparing aphron-containing liquid for damping under static conditions without using special gas-dispersing equipment and based on available reagents.

EFFECT: improved and valuable technical properties of liquid.

2 cl, 3 tbl, 3 ex

Grouting mortar // 2322471

FIELD: gas and oil industry.

SUBSTANCE: invention relates to grouting mortars used in cementing casing strings in gaseous, gas-condensate or petroleum holes in zone of productive seam at moderate temperatures. Proposed grouting mortar comprises the following components, wt.-%: grouting Portland cement, 64.41-66.24; sulfacell, 0.13-0.40; microsilica MK-85, 0.33-1.99, and water, 33.20-33.30. Invention provides preparing grouting mortar of reduced water yield in face conditions and with simultaneous enhance of strength of cohesion of cement stone with a casing string.

EFFECT: improved and valuable properties of grouting mortar.

1 tbl, 1 ex

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to synthesis of unknown early N-[alkylphenoxypoly(ethyleneoxy)carbonylmethyl]-morpholinium chlorides. Invention proposes novel compounds - N-[alkylphenoxypoly(ethyleneoxy)carbonylmethy]-morpholinium chlorides of the general formula: wherein R means aliphatic hydrocarbon radical comprising 8-12 carbon atoms; n means an average degree of oxyethylation equal to 3, 6, 7, and a method for synthesis of these compounds. Synthesized compounds possess property of inhibitors of asphalt-resin-paraffin deposits and can be used in oil industry for prevention of precipitation of asphalt-resin-paraffin deposits from the oil in its extraction, preparing and transporting.

EFFECT: improved and valuable properties of compound.

2 tbl, 7 ex

FIELD: oil production, particularly to block bottomhole reservoir zone and to kill gas well drilled in highly-permeable productive reservoir, as well as well workover.

SUBSTANCE: method involves serially injecting blocking liquid and killing liquid in bottomhole reservoir zone. Blocking liquid is magnesium hydrogel comprising microshperes added in proportion of 10:4. Microsphere dimensions are selected to provide total bottomhole reservoir zone mudding and following microsphere flushing-out from bottomhole reservoir zone.

EFFECT: increased efficiency of reservoir blocking and gas well killing along with reservoir rock property retention and decreased well workover costs.

FIELD: oil production, particularly to block bottomhole reservoir zone and to kill gas well drilled in highly-permeable productive reservoir, as well as well workover.

SUBSTANCE: method involves serially injecting blocking liquid and killing liquid in bottomhole reservoir zone. Blocking liquid is magnesium hydrogel comprising microshperes added in proportion of 10:4. Microsphere dimensions are selected to provide total bottomhole reservoir zone mudding and following microsphere flushing-out from bottomhole reservoir zone.

EFFECT: increased efficiency of reservoir blocking and gas well killing along with reservoir rock property retention and decreased well workover costs.

FIELD: oil and gas production.

SUBSTANCE: invention relates to treatment of drilling fluids prepared using industrial-grade potassium chloride products produced according to GOST4568-95. Reagent for treating drilling fluids contains industrial-grade potassium chloride product together with anti-conglomeration reagent, namely aliphatic C16-C20-amines, added thereto during production. Reagent is composed of 75% orthophosphoric acid, 22.76-63.88%, double superphosphate, 18.06-38.62%, and water. In a method of preparing such reagent, double superphosphate is stirred in water at 1:1 ratio for 2-4 h at 40-50°C to form mixture, which is cooled to 20-30°C, and after addition of orthophosphoric acid vigorously stirred.

EFFECT: enabled preparation of sedimentation-stable compositionally uniform high-efficiency reagent preventing release of ammonia from drilling fluids and extended assortment of reagents for controlling drilling fluids.

2 cl, 1 tbl

FIELD: oil and gas well production, particularly to cement surface casing and producing well with abnormally low reservoir pressure.

SUBSTANCE: method involves serially injecting buffer fluid, plugging cement mix, aerated plugging cement mix and displacement fluid in well. Buffer fluid includes neonol-based foam generator in amount of 3-4% by weight, chemical reagent in amount of 2-3% by weight, nitriletrimethylphosphonic acid in amount of 0.2-1.0% by weight, remainder is water. Said buffer fluid is aerated or saturated with inert gas and injected in well. The plugging mix is solution with increased isolating ability having density of 1810-2000 kg/m3. Plugging mix contains (in parts by weight) Portland cement - 100, chemical reagent used in buffer fluid - 0.1-0.5, calcium chloride or aluminum sulfate - 2.0 and water - 48-50. In the case of surface casing cementing the injection is carried out in the following order: solution with increased isolating ability, solution with increased isolating ability saturated with air or inert gas up to density of not more than 1200 kg/m3. In the case of producing string cementing first of all solution with increased isolating ability is injected, then solution with increased isolating ability saturated with air or inert gas up to density of not more than 1300 kg/m3 is fed and finally solution with increased isolating ability is injected. Displacing fluid is supplied at the rate of 15-60 m3/hour.

EFFECT: increased efficiency.

4 ex, 1 tbl

FIELD: oil and gas well production, particularly to cement surface casing and producing well with abnormally low reservoir pressure.

SUBSTANCE: method involves serially injecting buffer fluid, plugging cement mix, aerated plugging cement mix and displacement fluid in well. Buffer fluid includes neonol-based foam generator in amount of 3-4% by weight, chemical reagent in amount of 2-3% by weight, nitriletrimethylphosphonic acid in amount of 0.2-1.0% by weight, remainder is water. Said buffer fluid is aerated or saturated with inert gas and injected in well. The plugging mix is solution with increased isolating ability having density of 1810-2000 kg/m3. Plugging mix contains (in parts by weight) Portland cement - 100, chemical reagent used in buffer fluid - 0.1-0.5, calcium chloride or aluminum sulfate - 2.0 and water - 48-50. In the case of surface casing cementing the injection is carried out in the following order: solution with increased isolating ability, solution with increased isolating ability saturated with air or inert gas up to density of not more than 1200 kg/m3. In the case of producing string cementing first of all solution with increased isolating ability is injected, then solution with increased isolating ability saturated with air or inert gas up to density of not more than 1300 kg/m3 is fed and finally solution with increased isolating ability is injected. Displacing fluid is supplied at the rate of 15-60 m3/hour.

EFFECT: increased efficiency.

4 ex, 1 tbl

FIELD: oil and gas production.

SUBSTANCE: invention, in particular, aims to increase efficiency of treating facially non-uniform formations as well as to recover hard-recoverable oil reserves. Reagent according to invention is based on bitumen-containing product and further contains 3.0-45.5% hydrocarbon solvent, 0.05-10,0% glycerol rectification bottom residue mixture, 0.05-4.5% surfactant, and 0.05-10.0% pH regulator: aluminum-containing waste from benzene-olefin alkylation process and/or caprolactam production waste. In a method of treating watered formation including injecting bitumen-containing reagent, forcing it into formation, and required ageing time, above-indicated reagent is used as bitumen-containing reagent.

EFFECT: increased filtration resistance in high-permeability washed zones and increased efficiency of using emulsion compositions during development of oil deposits.

6 cl, 2 tbl, 11 ex

FIELD: production and exploratory well drilling, particularly foaming drilling fluids used during penetration through incompetent rock intervals and during primary productive oil and gas deposit opening in the case of abnormally low formation pressure.

SUBSTANCE: foam composition comprises surfactant, foam stabilizer, water, water hardness control additive and lubricant. The water hardness control additive is sodium silicate. The lubricant is VNIINP-117 emulsion. The foam stabilizer is polyacrylamide, the surfactant is sulphonole. All above components are taken in the following amounts (% by weight): sulphonole - 0.8-1.5, sodium silicate - 0.2-0.5, polyacrylamide - 0.1-0.5, VNIINP-117 - 0.5-2, remainder is water.

EFFECT: reduced power inputs for well drilling, as well as reduced coefficient of friction between drilling tool and well wall.

1 tbl

Drilling mud // 2268909

FIELD: drilling wells; water-base drilling muds.

SUBSTANCE: drilling mud contains the following components, mass-%: clay, 1.5-3.0; carboxymethyl cellulose, 0.1-0.3;carboxymethyl starch, 0.75-1.5; mixture of ethers and amides of fatty acids and ethanol amides, 0.75-1.0; product of rectification of propylene oligomers of isoolefin type, fraction C13-C15, 0.75-1.5;lubricating additive, 0.5-3.0; the remainder being water.

EFFECT: enhanced inhibition ability of drilling mud at improved technological parameters.

2 tbl, 3 ex

FIELD: oil and gas production.

SUBSTANCE: invention relates to drilling fluids used when boring oil and gas wells. Lubricating additive contains 10-30% tall oil, 15-20% polyglycols, 40-50% oxal flotation reagent, and 15-20% beet molasses.

EFFECT: increased stabilizing, lubricating, and antiwear properties of drilling fluid.

2 tbl, 2 ex

FIELD: oil and gas production.

SUBSTANCE: invention relates to oil production technology involving use of hydrochloric acid-based chemicals via complex hydrochloric acid effect on well bottom zone to intensify oil production and may be specifically used to increase oil recovery of viscous oil-saturated low-permeable carbonate reservoirs. Composition contains 22-28% of 20 vol % aqueous HCl solution, 7-8% of 98% aqueous acetic acid solution, and 65-70% of solvent based on light pyrolysis tar obtained as secondary product from petroleum processing enterprises.

EFFECT: increased well bottom zone treatment efficiency due to improved quality of treatment composition, in particular stability and dipping depth into formation.

4 tbl

FIELD: lubricants and boring engineering.

SUBSTANCE: multiple-purpose reagent containing lubrication-and-stabilization component (70-80%) and solvent (20-30%) contains, as said lubrication-and-stabilization component, oxidized mixture of paraffins, naphthenic and aromatic hydrocarbons at ratio 2:3:4, and, as said solvent, diesel fuel or kerosene.

EFFECT: improved lubrication properties of viscous-plastic drilling fluids and stabilized inverted emulsions used in boring operation and in pullout of hole.

2 cl, 2 tbl, 6 ex

FIELD: lubricants and boring engineering.

SUBSTANCE: multiple-purpose reagent containing lubrication-and-stabilization component (70-80%) and solvent (20-30%) contains, as said lubrication-and-stabilization component, oxidized mixture of paraffins, naphthenic and aromatic hydrocarbons at ratio 2:3:4, and, as said solvent, diesel fuel or kerosene.

EFFECT: improved lubrication properties of viscous-plastic drilling fluids and stabilized inverted emulsions used in boring operation and in pullout of hole.

2 cl, 2 tbl, 6 ex

FIELD: oil and gas production.

SUBSTANCE: invention provides water-based solid phase-free biocationic drilling fluid with density 10-70-1520 kg/m3. Drilling fluid contains 10-60% of a cation spectrum, namely calcium and sodium chlorides, and 0.1-2% of polymer additive, in particular xanthane series biopolymer.

EFFECT: improved wall-plastering and lubrication properties.

2 tbl

FIELD: petroleum-gas-extracting industry.

SUBSTANCE: invention relates to materials used for cementing oil, gaseous, gas-condensate and geothermal holes under conditions of saline and hydrogen sulfide media. The salt-saturated plugging composition for high-temperature holes comprising a binding agent and sodium chloride includes additionally swollen vermiculite sand of fraction 0.3-2.5 mm in the following ratio of components, wt.-%: binding agent, 85-90; sodium chloride, 8-10; swollen vermiculite sand of fraction 0.3-2.5 mm, the balance. Invention provides preparing impermeable cement stone with enhanced coupling strength with a column in the range of temperatures 50-110°C.

EFFECT: improved properties of composition.

1 tbl

FIELD: petroleum and gaseous industry.

SUBSTANCE: invention relates to drilling oil and gaseous wells, in particular, to polymer-clay fluids for drilling used under conditions of permafrost rocks. Proposed polymer-clay fluid shows the improved pseudoplastic properties providing enhancing retaining and transporting capacity and treatment degree of the well walls, diminished filtration due to high rate in formation of low-penetrable filtration crust preventing the well pollution and promoting to retention of its collector properties, reduced rate of warming up of permafrost rocks that prevents formation of caverns and destruction of the well walls and as result provides prolonged retention of the well trunk in the stable state. Polymer-clay fluid for wells drilling in permafrost rocks doesn't freeze at negative temperatures and comprises clay, stabilizing agent as a mixture of polysaccharide reagent and structure-forming agent, hydrocarbon antifreeze and water. As a polysaccharide reagent the polymer-clay fluid comprises Acinetobacter sp. biopolymer, and as a structure-forming agent it comprises condensed sulfite-alcohol distillery grains in the following ratio of components, wt.-%: clay, 6-8; condensed sulfite-alcohol distillery grains, 4-6; Acinetobacter sp. biopolymer, 2-4; hydrocarbon antifreeze, 7-19, and water, the balance, wherein the ratio of Acinetobacter sp. biopolymer and condensed sulfite-alcohol distillery grain = 1:(1-3) mas. p., respectively. As hydrocarbon antifreeze, polymer-clay fluid comprises carbamide or glycerol. Invention provides enhancing effectiveness in drilling of wells in permafrost rocks.

EFFECT: improved properties of polymer-clay fluid.

2 cl, 15 ex

FIELD: oil and gas industry, particularly flowing well killing for underground repair and overhaul performing.

SUBSTANCE: method involves blocking perforation interval and part of well bottom zone by replacing well fluid with blocking fluid and killing liquid arranged over the blocking one. Free gas is removed from well before blocking fluid delivery to well bottom. Necessary liquid level at well head is provided by well operation stoppage for a certain time, which provides termination of formation fluid degassing in well bore and free gas lifting to well head. Tube space and hole annuity is filled with liquid in several steps along with discharge of gas portions. Gas portion discharge may not result in formation fluid rise inside well bore to level of formation fluid degassing. Density of liquid to be added in tube space and hole annuity provides well filling to head thereof. Well killing liquid comprises industrial magnesium chloride, alkali or alkaline-earth metal hydrate, alkali metal carbonate and pore sealant, for instance cacao-bean pods and fresh water taken in predetermined ratio.

EFFECT: increased efficiency, possibility to kill wells characterized by abnormally high permeability of production bed and high gas factor.

2 cl, 1 ex

Up!