Emulsion drilling fluid hydrocarbon-based |
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IPC classes for russian patent Emulsion drilling fluid hydrocarbon-based (RU 2211239):
 
 The drilling fluid is oil-based / 2208035
The invention relates to the drilling of oil and gas wells, particularly to washing liquids used in the opening and the fracturing of the productive strata, for well killing with the repair, and appraisal wells with low formation pressure coring, with natural neftegazonosnosti
 The drilling fluid is oil-based / 2208034
The invention relates to the drilling of oil and gas wells, particularly to washing liquids used in the completion and drilling of appraisal wells with coring with natural saturation
 The method of obtaining invert-emulsion solution / 2205855
The invention relates to the oil and gas industry, in particular hydrophobic emulsions used in the killing of wells before conducting underground repairs
 The multiphase lubricant concentrate for use in aqueous working fluids in the field of exploration by drilling / 2203921
The invention relates to lubricating means, which in the course of drilling is added to the corresponding drilling fluids.
 Liquid for killing wells / 2203304
The invention relates to the field of oil and gas, in particular compositions for killing the well, and can be used at the enterprises of the oil and gas industry underground and well workover
 The emulsifier for the preparation of invert emulsions / 2203130
The invention relates to emulsifiers, are able to form invert emulsions, which are used for enhanced recovery of oil
 The method of obtaining the emulsifier-stabilizer hydrophobic emulsion drilling fluids / 2201950
The invention relates to the field of chemicals used in drilling oil and gas wells, particularly to a process for the preparation of emulsifier-stabilizer, designed to obtain highly stable hydrophobic emulsion drilling fluids with high water content, which are used for drilling in mineral salts composition, unstable clayey rocks, at the opening of productive formations, killing Skagen
 Fluid for plugging and temporary abandonment of wells / 2201498
The invention relates to gazoneftedobyvayuschie industry, in particular to the killing and preservation of wells with abnormally low formation pressure
 Reagent for invert emulsion fluids / 2200753
The invention relates to the oil and gas industry, in particular to the invert emulsion fluids used in well construction, completion and workover
 Emulsifier invert emulsions / 2200056
The invention relates to emulsifiers invert emulsions and can be used to obtain a homogeneous mixture of two immiscible liquids such as oil and water, oil and water, etc. used in the oil and gas industry
 Well completion and pullout composition / 2253664
Composition 61.0-68.9% petroleum or petroleum processing product, 2.0-4.7% natural fatty acid, 2.1-4.0% sodium hydroxide, and natural calcium carbonate with particle size 2 to 50 μm - the rest. Natural fatty acid employs vegetable and animal fat production waste.
Hydrophobic emulsion / 2257469
Hydrophobic emulsion designed as fluid for killing of oil and gas wells and as grouting mortar or water-insulation fluid contains 25.0-40.0% of degassed crude oil from Allakaevo oilfield and water (the rest).
Hydrocarbon-based drilling fluid / 2263701
Invention provides environmentally safe hydrocarbon-based drilling fluid suitable for use during boring and completion of oil and gas wells. Drilling fluid is characterized by required viscosity and structural properties within a wide water content range and, in particular, contains, wt %: castor oil 50.0-83.0, colophony calcium resinate (thickener) 4.0, calcium chloride 10.0, Neonol AF-9/12 (emulsifier) 0-0.3, organophilic bentonite 2.0-3.0, water 0-30.0, and penosoline (waterproofing agent) 0-20.
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The invention relates to the oil and gas industry, and specifically to physico-chemical methods of stimulation during the initial opening of productive oil fields. The technical result is the reduction of water loss, prevent clogging of the pore space of the bottomhole zone during the initial drilling. Emulsion drilling fluid is oil-based, including oil, surface-active emulsifier, gidrofobizirovannym dispersed chalk, mineralized water phase contains a water phase varying degrees of salinity and additionally simulator - chemically modified silica with 40-70% degree of substitution of surface silanol groups on the alkyl-aryl radicals - Policy-DF in the following ratio of ingredients, wt.%: liquid petroleum products - 25-60; the specified emulsifier - 1,0-2,5; specified chalk - 3-10; Policy-DF - 0,6-1,5; specified aqueous phase - the rest. And alkyl-aryl radicals are CH3With2H5With3H7With6H5specified chalk repelling agent by mechanical mixing of chemically modified silica from 99.8-99.9% of the hydrophobicity and the end of the.f-crystals, 3 table.
The invention relates to the oil and gas industry, and specifically to physico-chemical methods of stimulation during the initial opening of productive oil fields.
At the opening of the productive formation during drilling mode repression in the reservoir enters the mud filtrate. The result is a decrease in the permeability of the productive reservoir zones and, as a consequence, the unjustified reduction of the potential production of the well. Trapped in the reservoir water or mud filtrate push oil from the stalk of the deep zone of the reservoir and cause the reduction of the permeability of the reservoir oil. The reasons for this are - swelling clay particles contained in the rocks composing the collector; - blocking action of the water due to capillary and surface phenomena; - education in the pore space of insoluble residues in the interaction of the filtrate and formation fluids; - obstruction of pores and solid particles (clays), penetrating into the reservoir together with the filtrate.
The problem of reducing the fluid loss of drilling fluids and to prevent clogging of the pore space allocaion is the falling into the reservoir and reduce its negative impact on the bottom-hole zone wells (starch, polysaccharides, carboxymethylcellulose, surfactants, oil-based solutions, hydrophobic emulsion solution) /1/.
The closest analogue to the claimed solution is emulsion drilling fluid comprising an emulsifier - emulsol of the brands mentioned, a saturated aqueous solution of calcium chloride, gidrofobizirovannym dispersed chalk, liquid petroleum products - diesel fuel with the following ratio of ingredients, wt.%: Emulsifier - emulsol mentioned grades 6 -12 Saturated aqueous solution of calcium chloride - 24 - 50 Gidrofobizirovannym dispersed chalk - 15 - 25 Liquid petroleum - diesel fuel - Rest /2/ the Purpose of this invention to provide an invert emulsion drilling mud - IBR having low fluid loss and prevent clogging of the pore space of the bottomhole zone during the initial drilling.
The technical result is achieved by the fact that the emulsion drilling fluid is oil-based, including liquid petroleum, surface-active emulsifier, hydrophobicity optional simulator - chemically modified silica with 40-70% degree of substitution of surface silanol groups on the alkyl-aryl radicals - Policy-DF, in the following ratio of ingredients, wt.%: Liquid petroleum products - 25-60 The specified emulsifier - 1,0-2,5 Specified chalk - 3-10 Policy-DF - 0,6-1,5 Specified aqueous phase - Rest Alkyl-aryl radicals, modifying the surface of silica, are CH3With2H5With3H7With6H5. Specified chalk repelling agent by mechanical mixing of chemically modified silica from 99.8-99.9% of hydrophobicity and a concentration of 0.5-1.0%. The size of the discrete particles of chemically modified silica is 0.005 to 0.1 μm. The volume ratio of the dispersed phase and the dispersion medium varies from 0,40/0,60 $ 0.75/0.25 in. Policy-DF obtained by /3/ in terms of providing 40-70% substitution of surface silanol groups of silica (Aerosil, white soot filter perlite and other) alkyl-aryl radicals, in invert-emulsion drilling fluid performs two functions: a) a solid emulsifier with high stabilizing capacity; b) is structurating impact of drilling mud. Filtration cork is oleogel of gelatinizing hydrophobic emulsion with a high content of active superfine filler. During the development of the well filtration cortex due to their oleophilic properties prevents oil filtering and is washed away in the stream of hydrocarbon fluid from the pores of the stalk of the zone of the reservoir. The presence in the emulsion surface-active emulsifier leads to an additional reduction of the interfacial tension at the boundary of water-oil and thereby enables the formation of a stable microemulsion. Examples of specific performance. IEBR prepared as follows: In diesel fuel under stirring enter Policy-DF and emulsifier and, after dilution (10-15 min) in the formed hydrocarbon suspension under vigorous stirring (not less than 5000 rpm) batch is dispersed mineralized aqueous phase. The optimum mixing time of the resulting invert emulsion is determined by the value of parameter "electrocapillary" which, as a rule, about 30 minutes Then, if necessary, carry the weight of the drilling fluid chalk, barite or marble chips. In table 1, PR is annoy concentration of POLYSIL-DF and emulsifier. All emulsion solutions were obtained by mixing paddle stirrer with a speed of 5000 rpm As can be seen from the table, the presence in the emulsion only POLYSIL-DF or multala (examples 1-3) does not ensure the formation of emulsions with high aggregate stability and low values of the rate of filtration. When the content in the emulsion at the same time POLYSIL-DF and multala (example 4) dramatically improved indicators such as sedimentation stability, electrocapillary, filtereddata. Replacement of fresh water in a saturated solution of calcium chloride does not result in a drastic change of the characteristics IEBR (see examples 4 and 5), but the salinity of the aqueous phase reduces the risk of undesirable hydration of clay rocks due to osmotic transfer of water from the solution. Replacement of diesel fuel oil with a viscosity of 4.9 MPa leads to a noticeable increase in the viscosity of the system and dramatically reduce the rate of filtration (cf. examples 5 and 6). When comparing properties IEBR obtained according to the invention and the prior art (examples 5 and 7), it is seen that the rate of filtration of the proposed structure is significantly reduced. The analysis of the presented results shows that the proposed seawashed known on such an important indicator as filtereddata. On the technological properties IBR is significantly influenced by the ratio of the phases, the concentration of emulsifiers and conditions of use (PL. 2). So, prepared under stirring paddle stirrer emulsion (example 8) after additional dispersion in the mixer (11000 rpm) is the rate of filtration in the order below the original. Characteristics such as static shear stress, filtereddata not change within 2-20 days (examples 8 and 9). The increase in the content of the dispersion phase in emulsions (examples 8-12) leads to a decrease of the rheological parameters of the system, but the rate of filtration varies slightly. Lowering the concentration of Policie below 0.6 and the emulsifier is less than 1 wt.% (example 13) results in the release of hydrocarbons, which indicates poor stability IBR. Example 14. Improving the rheological characteristics and the weighting IBR is achieved by increasing the share of mineral dispersed phase, and the introduction into the solution of such a solid dispersion of fillers, as chalk, barite, marble, etc. This purpose was prepared emulsion solution of the following composition, wt.%: Diesel - 30 Poly who their water-repellent properties of the chalk was pre-mixed with chemically modified silica hydrophobicity and 99.8 % (the brand Policy P1) and with a concentration of 0.5 wt.%. Table 3 shows the characteristics of IBR, stable Policrom-DF and containing as a filler and amendment hydrophobic chalk. As can be seen from table 3, the introduction of hydrophobic emulsion dispersed chalk leads to the formation of a protective cover with a thickness of less than 0.5 mm, protecting from penetration of cement filtrate solution for subsequent cementing fluids zone of the reservoir. This crust can be easily removed by acid treatment. Weighted chalk the system has a heat resistance of more than 150oWith high Gliniasty (50%). Furthermore, the addition of hydrophobic chalk in the emulsion increases its rheological characteristics and extends the application of such systems as drilling fluids during the initial completion. Are given in table. 1-3 data allow to establish the optimum formulation IEBR for different conditions of initial opening of the reservoir, depending on the geological and physical reservoir properties and physico-chemical characteristics saturating his fluids. On set of rheological properties, electrical stability, rate of filtration, the most effective are accounted for is responsible; the concentration of chemically modified silica with 40-70% degree of substitution of surface silanol groups on the alkyl-aryl radicals of from 0.6 to 1.5 wt.%; the concentration of emulsifier (ionic or nonionic surfactants) to 1.0-2.5 wt.%; - contents in IEBR hydrophobic chalk 3-10 wt.% Sources of information 1. Kasyanov N. M , Stirling C. F., "improving the quality of the opening of productive layers, a series of Drilling, VNIIEM, M., 1969, S. 3-88. 2. USSR author's certificate 958463, From 09 To 7/06, 15.09.1982. 3. Makarov A. S. and others, "Study of structural-mechanical properties of inverse emulsions based on Aerosil", Colloid journal, 1975, T. 37,15, S. 889-893.
2. The solution on p. 1, characterized in that the alkyl-aryl radicals are CH3With2H5With3H7With6H5. 3. The solution on p. 1, characterized in that the specified chalk repelling agent by mechanical mixing of chemically modified silica from 99.8-99.9% of hydrophobicity and a concentration of 0.5-1.0%. 4. The solution under item 1 or 3, characterized in that the size of the discrete particles of chemically modified silica ranges from 0.005 to 0.1 μm.
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