Clayless drilling mud

FIELD: oil and gas production.

SUBSTANCE: clayless drilling mud that includes fluorine-containing acrylamide copolymer and acrylic acid and water contains copolymer of general expression: molecular weight 1.2·106 with fluorine content up to 2%, with the following components ratio, wt %: said copolymer 0.1-0.15, water the rest.

EFFECT: stability of operating parameters up to 120 days at low temperatures.

1 tbl, 1 ex

 

The invention relates to the field of drilling oil and gas wells, namely the non-clay drilling fluids used in drilling, mainly when opening the drilling of productive layers in the winter at temperatures down to minus 22°C.

Known non-clay drilling mud (RF Patent No. 1556099, SC 7/02, publ. 1995), which includes an acrylic polymer, a salt of trivalent metal and water, characterized in that, to improve the ability to restore the technological properties after removal of drilling cuttings while increasing the speed of flocculation, it further comprises a cellulose ether in the following ratio of ingredients, wt.%:

Acrylic polymer0,001-0,035
Salt of trivalent metal0,003-0,030
The cellulose ether0,100-0,300
WaterRest

The disadvantages of the known non-clay drilling mud can be attributed to increased hydrodynamic pressure in the circulation, which reduces the efficiency of the washing process well and has a negative impact on maintaining the permeability zone of the formation.

WPI the walls of the drilling fluid (RF Patent No. 2243984, SC 7/02, publ. BI No. 1, 2005), containing acetylcellulose (TEV) or carboxylmethylcellulose (CMC), petroleum products - as an amendment, superfine powder filler with an associated gas (air, nitrogen) in the following ratio of ingredients:

Acetylcellulose (TEV), or
carboxylmethylcellulose (CMC)0,2÷0,3
Petroleum (oil commodity, diesel fuel, oil)5÷30
Surfactants (sulfinol, OP-10)0,02÷0,05
Superfine filler
(modified bentonite, lignosulfanaty)0,9÷1
Air-gas mixture is air, nitrogen (volume)2÷20
WaterRest

The disadvantages of the known drilling mud can be attributed to the high cost, toxicity, fire hazard, the possibility of environmental pollution drilling waste, the problem of safe disposal.

Known drilling R is the target (Patent RF №2362793, SC 8/08, publ. BI No. 21, 2009), containing polyacrylamide, soda ash and water, and it additionally contains carboxylmethylcellulose (CMC) and biopolymer "Suraksan" or "Soraksan-T" in the following ratio of ingredients, wt.%:

Polyacrylamide (PAA)0,15-0,3
Carboxylmethylcellulose0,3-0,5
Soda ash, Na2CO30,3-0,5
Biopolymer "Suraksan" or "Soraksan-T"0,1-0,2
WaterRest

The disadvantages of this non-clay drilling fluid are increased content of PAA, the inclusion in the formulation of expensive chemicals and the impossibility of its use at low ambient temperatures (minus 22°C).

Known non-clay drilling mud (US Patent No. 4780517, C08F 20/58, publ. 1988), containing from about 50 to 98 mol.% acrylamide, from about 1.9 to to 49.9 mol.% salt of an alkali metal or ammonium salts of acrylic acid and from about 0.1 to 5 mol.% copolymerizing ionic surfactants.

The disadvantages of this non-clay Burov the solution can be attributed to the high content of the polymer, the necessity of introducing ionic surfactants.

Known drilling fluid (RF Patent No. 2301244, SC 8/12, publ. BI No. 17, 2007), which is produced by mixing fresh water, brine or sea water and from about 0.3 pound to about 2.5 pounds active polymer compound of one or more anionic dispersed polymers. Anionic dispersed polymers comprise from about 2 to about 98 mol.% one or more anionic monomers and from about 98 to about 2 mole percent of one or more nonionic monomers.

The disadvantages of this non-clay drilling mud can be attributed to the high content of the polymer, and the need for the introduction of saline or sea water.

Known drilling mud (CN Patent No. 1528797, C08F 220/56, publ. 2004), which has a high efficiency for hydrophobic Association, where the average molecular weight 15000,000-25000,000, has a low freezing point and resistance to salt deposits able to be applied in areas such as tertiary oil production.

The disadvantages of this mud can be attributed to the high content of the polymer is from 15 to 35%, and the non-fulfilment of a long time at low temperatures down to minus 22°C.

The challenge aimed invented the e, is the development of non-clay composition of the drilling fluid, which is characterized by low polymer consumption, reduced cost of drilling mud, provides long-time stability of operating parameters in normal and difficult drilling conditions when exposed to low temperatures (temperatures down to minus 22°C).

The technical result is to obtain non-clay mud, stable operating parameters for up to 120 days when exposed to low temperatures down to minus 22°C.

Technical result is achieved by non-clay drilling solution containing fluorine-containing copolymer of acrylamide and acrylic acid and water, characterized in that the use of a copolymer of General formula

molecular weight of 1.2·106with a fluorine content of up to 2%, in the following ratio of ingredients, wt.%:

The specified copolymer0,1
WaterRest

The data in the table show that the larger amount of ingredients is not economically feasible, since the increase in the content of the copolymer increases the viscosity of the solution and the freezing point is not changed.

The results of the analysisThe concentration of the fluorine-containing copolymer in solution, wt.%Water, wt.%The expiry time, in secondsFreezing point, °C0,699,431minus 220,399,718minus 220,1599,8512minus 220,199,98minus 22

Example. To obtain a fluorine-containing copolymer is a copolymer of acrylamide and acrylic acid and octaviocandelaria, reagent ratio of 1:5. In a reactor with a stirrer administered 1 g of the copolymer and add 20 ml of benzene, then add 5 g of octopetala. The temperature was raised to 120°C and carry out the reaction for about 120 minutes. Upon completion of the reaction product is distilled benzene, filtered and dried residue.

The structural formula of the obtained copolymer

Molecular weight 1.2·106x=60%, y=40%. The fluorine content of 2%, with the following ratio of ingredients, wt.%:

The specified copolymer0,1
Water99,9

The melting point of 160°C. the Data of the IR-spectrum: 2916 cm-1, 2368 cm-1, 1660 cm-1, 1417 cm-1, 1250 cm-1, 1094 cm-1.

For preparation of the drilling fluid is water and the fluorine-containing copolymer. Order to obtain a homogeneous gel-like mass, time, solution preparation is 24 hours with constant stirring.

Ready for use in the drilling mud has the following rheological characteristics:

Density (ρ)1010 kg/m3
Viscosity (In)8 sec
Freezing pointminus 22°C
PHpH 7

Tests of the inventive drilling fluid show that it is universal and does not contain expensive reagents, such as To The Church The solution remains stable up to 120 days, the viscosity does not change and is 8 seconds at normal and at low temperatures (minus 22°C).

The inventive drilling fluid possesses a number of useful qualities:

- has a high carrying capacity;

- saves a long time its stability, up to 120 days;

- improves the quality of well casing due to the exclusion of education of the mud cake on the walls of the borehole;

- prevents contamination of the formation;

- can be operated at low temperatures.

The proposed drilling fluid meets all the requirements for non-clay mud, therefore, eliminates the consumption of bentonite.

Wide application of drilling mud will provide tangible economic benefits.

Non-clay drilling mud containing fluorine-containing copolymer of acrylamide and acrylic acid and water, characterized in that the use of the copolymer of the General formula:

molecular weight of 1.2·106with a fluorine content of up to 2% in the following ratio of ingredients, wt.%:

The specified copolymer0,1-0,15
Water Rest



 

Same patents:

FIELD: chemistry.

SUBSTANCE: in the method of treating water-based process liquids used in drilling and well workover, by adding a sodium halide-based clay inhibitor, the clay inhibitor is a furacilin preparation containing furacilin and sodium chloride in amount of 0.8-4.2 wt %.

EFFECT: high efficiency of the treatment method owing to improved inhibiting properties, wide range of clay inhibitors.

11 ex, 2 tbl

FIELD: chemistry.

SUBSTANCE: in the method of treating water-based process liquids used in drilling and well workover, by adding a sodium halide-based clay inhibitor, the clay inhibitor is a furacilin preparation containing furacilin and sodium chloride in amount of 0.8-4.2 wt %.

EFFECT: high efficiency of the treatment method owing to improved inhibiting properties, wide range of clay inhibitors.

11 ex, 2 tbl

FIELD: chemistry.

SUBSTANCE: in the method of treating water-based process liquids used in drilling and well workover, by adding a sodium halide-based clay inhibitor, the clay inhibitor is a furacilin preparation containing furacilin and sodium chloride in amount of 0.8-4.2 wt %.

EFFECT: high efficiency of the treatment method owing to improved inhibiting properties, wide range of clay inhibitors.

11 ex, 2 tbl

FIELD: oil and gas industry.

SUBSTANCE: according to the method of oil-gas wells killing on deep water subsea deposits by pumping of certain volume of kill composition together with sea water into the well thus providing creation of killing spout in the well with timeless pressure on formation exceeding formation pressure not less than 1.2 times, as a killing composition, preventing immediate contact of cold sea water with overheated formation fluids and productive stratum of formation, large hydrophobic disperse system is used with density exceeding density of sea water more than 5 times in the volume ensuring in bottom-hole zone of the well creation of spout of large hydrophobic disperse system with height exceeding productive stratum formation opened by perforation not less than 3 times. Mentioned disperse system is a disperse system with volume of 70%, where as disperse medium hydrocarbon liquid is used, this liquid doesn't set solid under temperatures to -10°C, its density is not less than 0.860 g/cm3; as disperse phase a mixture of hard metal balls with diameter within 1-2 mm is used, 50% of this ball mixture volume have fusion temperature well over bottom-hole temperature, and the other 50% of this ball mixture volume have fusion temperature 10°C and more below bottom-hole temperature.

EFFECT: improving reliability of oil-gas wells killing on deep water subsea deposits with excessive temperature and pressure of productive formation.

3 cl, 2 tbl

FIELD: oil and gas industry.

SUBSTANCE: according to the method of oil-gas wells killing on deep water subsea deposits by pumping of certain volume of kill composition together with sea water into the well thus providing creation of killing spout in the well with timeless pressure on formation exceeding formation pressure not less than 1.2 times, as a killing composition, preventing immediate contact of cold sea water with overheated formation fluids and productive stratum of formation, large hydrophobic disperse system is used with density exceeding density of sea water more than 5 times in the volume ensuring in bottom-hole zone of the well creation of spout of large hydrophobic disperse system with height exceeding productive stratum formation opened by perforation not less than 3 times. Mentioned disperse system is a disperse system with volume of 70%, where as disperse medium hydrocarbon liquid is used, this liquid doesn't set solid under temperatures to -10°C, its density is not less than 0.860 g/cm3; as disperse phase a mixture of hard metal balls with diameter within 1-2 mm is used, 50% of this ball mixture volume have fusion temperature well over bottom-hole temperature, and the other 50% of this ball mixture volume have fusion temperature 10°C and more below bottom-hole temperature.

EFFECT: improving reliability of oil-gas wells killing on deep water subsea deposits with excessive temperature and pressure of productive formation.

3 cl, 2 tbl

FIELD: oil and gas industry.

SUBSTANCE: lubricant for drill fluids include, wt %: phosphatide concentrate extracted from sunflower oil, 70-90, tar oil received by distillation of fatty acids extracted from soap stocks of light vegetable oils, 30-10.

EFFECT: exclusion of use of food vegetable oils as a part of lubricant, improvement of antifriction and antiwear properties of lubricant under high loads, fat-and-oil industry waste disposal.

5 tbl

FIELD: oil and gas industry.

SUBSTANCE: in method for balancing of injection well water-intake capacity profile and restriction of water influx to production wells, which involves pumping to the formation of gel-forming composition containing, wt %: sodium silicate 1-10, chrome acetate 0.5-2, water is the rest, pumping of the above composition to formation, technological pause, prior to pumping of the above composition to wells there pumped is fresh water; induction period of gel-forming composition at formation temperature is set so that it is equal to 6-10 hours, and technological pause is chosen so that its duration is equal to 24-36 hours.

EFFECT: improving the efficiency of oil displacement from formation due to water isolation of highly water-flooded formations in production wells either due to equalising the water-intake capacity profile of injection wells by partial or complete blocking of highly washed channels or interlayers for movement of injection water.

1 ex, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: water influx isolation method involves installation of process shield using the solution containing Mikrodur RU, Sulfatsell, ethylene glycol and water at water-cement ratio of 0.8-0.9. Installation of the above shield is performed in terrigenous formation which is by 5-10 m higher than oil-water contact on the basis of 0.5-2.0 m3 per 1 m of effective formation thickness at the following component ratio, wt %: Mikrodur RU 51.7-54.6, Sulfatsell 0.6, ethylene glycol 1.1, and water 43.7-46.6.

EFFECT: improving bottom water insulation, providing the reduction of water content of wells during development of oil and gas deposits.

1 tbl

FIELD: oil and gas industry.

SUBSTANCE: compound-action composition for treatment of bottom-hole zone of gas well contains 70% of methanol water solution and mixture of surface active substances - SAS: non-ionic - OP-10 and anionic sulphanole at their ratio of 4:1 respectively, where the quantity of the above mixture is chosen as per the specified formula.

EFFECT: creation of compound-action composition for treatment of bottom-hole zone of gas well, which prevents foaming of pumped medium at its being supplied to bottom hole and hydrating along the shaft of gas well and in ground equipment when the liquid is carried over to surface and providing high efficiency for removing high-mineralised waters in presence of gas and gas condensate from bottom holes of low temperature gas wells.

1 tbl

FIELD: oil and gas industry.

SUBSTANCE: well treatment liquids include water, at least one hydratable polymer, granules of sodium percarbonate with the coating retarding its liberation. As per the first version, the above coating is non-organic material. As per the second version, the above coating includes mixture of styrene-acrylate and butyl acrylate. Underground formation hydraulic fracturing method involves granules of sodium percarbonate with coating from non-organic material retarding its liberation. Inventions have been developed in dependent claims.

EFFECT: avoiding premature viscosity reduction of treatment liquid due to using sodium percarbonate granules with the coating retarding its liberation.

23 cl, 4 tbl, 6 ex, 6 dwg

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!