Emulsion drilling fluid |
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IPC classes for russian patent Emulsion drilling fluid (RU 2213761):
 Emulsion drilling fluid hydrocarbon-based / 2211239
The invention relates to the oil and gas industry, and specifically to physico-chemical methods of stimulation during the initial drilling of oil deposits
 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
 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 drilling of oil and gas wells, namely to drilling mud for drilling in difficult mining and geological conditions and for qualitative opening productive reservoirs. The technical result is to increase the inhibitory properties of emulsion drilling fluid, preventing the swelling of shale, and increase the recovery factor of permeability of the productive reservoir. Emulsion drilling fluid containing hydrocarbon phase, calcium carbonate, mineral salt, stabilizer and salt water, contains as stabilizer starch PHYTO-RK, as well as mineral salts - duhaney magnesium MgCl2and potassium chloride KCl, and optional surfactant surfactant complex action PKD-515 in the following ratio of ingredients, wt.%: the hydrocarbon phase 10-20, surfactant complex action PKD-515 5-7, starch PHYTO-RK 3-4, MgCl25-10, KCl 3-5, calcium carbonate 5-30, mineralized water the rest. table 2.
The invention relates to the drilling of oil and gas wells, namely to drilling mud for drilling in difficult mining and geological conditions and for qualitative opening prod, mineralizovannoi water, emulsifier, bentonite clay and weighting. C. 1020428, C 09 K 7/06, 1983).
The disadvantages of this mud are the presence of contaminating the reservoir bentonite and barite, and lack of inhibition them swelling clays.
Closest to the proposed invention the technical essence is emulsion drilling fluid containing, wt.%: the hydrocarbon phase 5,0-15,0; calcium carbonate 6,0-14,5; iron chloride (III) 5,0-12,0; calcium oxide 1,5-4,5; uglevodorodyonogo nonionic surfactants (OP-4, PMS-200A, NGL-94 M , AF-4) 0.5 to 1.5; salt water - the rest. It can optionally contain bentonite 1.0 to 2.5 wt.% (and. C. RF 1613475, C 09 K 7/02, 1990, prototype).
The disadvantage of this technical solution are low ingibiruet ability, low coefficient of recovery reservoir permeability and high corrosion activity because of its content in the solution of ferric chloride (III).
Solved by the invention to improve inhibiting properties of emulsion drilling fluid, preventing the swelling of shale, and increase the recovery factor of permeability of the productive reservoir.
The problem is solved in that isator and salt water, characterized in that it contains as stabilizer starch PHYTO-RK, as well as mineral salts - duhaney magnesium MgCl2and potassium chloride KCl, and optional surfactant surfactant complex action PKD-515, in the following ratio of ingredients, wt.%: The hydrocarbon phase is 10-20 surfactant complex action PKD-515 - 5-7 Starch PHYTO-RK - 3-4 MgCl2- 5-10 KCl - 3-5 calcium Carbonate - 5-30 Mineralized water - the Rest Of the patent and scientific literature we are not aware of emulsion drilling fluid containing a combination of the above ingredients in the proposed quantitative ratio that allows to make a conclusion about the novelty of the claimed invention.
In laboratory and field trials emulsion drilling fluid as saline water was used produced water pashian horizon Made by square, and as the hydrocarbon phase - Devonian oil Tuimazy field. Produced water had a density of 1.18 g/cm3total mineralization of 248 g/L.
Inhibitory effect on swelling clay mineral water is well known (for example, J. R. gray, G. S., Darley, Composition and properties of drilling gongs, M. , "Nedra", 19 the global solution.
Surfactant complex action PKD-515 is a composite mixture of nonionic surfactants, hydrocarbon solvent, aliphatic alcohols, nitrogen-containing additives, produced according to TU-39-05765670 OP-211-95. As a repellent, prevents hydration of clays (RF patent 2149988, E 21 In 43/22, 1998). At the same time revealed a new feature PKD-515 - inhibition of swelling clays. In addition, PKD-515 reduces the surface tension at the boundary of the filtrate oil and increases the recovery rate of permeability of the productive reservoir.
Part of the solution of calcium carbonate produced according to TU 5743-034-00204872-97. It is soluble by plugging and weighting, thereby foster the opening of a productive layer.
The use of starch PHYTO-RK (TU-2483-002-41668452-97) as a stabilizer solution dictated his santonocito. Even in concentrated solutions of starch PHYTO-RK does not undergo degradation. Such solutions can be used in the drilling of salt deposits.
As the hydrocarbon phase can be used as diesel fuel, oil, etc.
The current level of technology we do not know what the ingredients included in th is availa able scientific C of the proposed technical solutions to the criterion of "inventive step".
The method of preparation of the emulsion drilling fluid is as follows. For example, in 700 ml of saline water dissolved successively with 30 g of starch, 50 g of MgCl2and 30 g of KCl. Then the solution is injected 50 ml of surfactant PKD-515 and 100 ml of oil. Then for obtaining soluble peel and reduce the rate of filtration is injected calcium carbonate in a minimum quantity of 50 g, and if necessary weight to them, to the desired density. For regulating viscosity solution further may contain polyanionic cellulose, for example Staflo Regular production zo Nobel (the Netherlands) in an amount of 0.1-0.4 wt.%.
Thus obtained solution allows you to successfully drill prone to landslides clay rocks and qualitatively to open reservoirs. This solution is without complications drilled wells 372-Tuimazy, b Paul (horizontal), 3969-Tuimazy, where were passed prone to landslides kirovskie clay. Declare mud also eliminated the accident in the crumbling wells 37-Arlan and 328-Chekmagushsk.
In the laboratory comparative analysis of the proposed solution and prototype. Evaluation of main technological parameters issled wochnik mud M., "Nedra", 1979).
Inhibiting properties of solutions was estimated by moistening capacity indicator (P0), determined in accordance with RD 39-813-82, Krasnodar, Unicraft. This indicator comprehensively takes into account the effect of capillary imbibition, diffusion osmotic mass transfer in the process of hydration of the bentonite. The smaller the value of P0the higher inhibitory capacity has a solution.
The recovery coefficient of permeability was determined by the standard method for installing wipk-1M (Kalinka M. K. research Methods of reservoir properties viernow. M, Costoptimized, 1963) in the cores of terrigenous sediments pashian horizon Made by square.
Evaluation of the surface-active properties of the claimed and known solutions included the measurement of surface tension at the boundary between the filtrate solution and kerosene method account drops (N. E. Whispered. Guidance on physico-chemical analysis of clay muds, clays, weighting materials and reagents, M., "Nedra", 1974).
In table. 1 shows the component compositions of the investigated solutions. Solutions 1 and 5 contain the components in quantities below the bottom and the bottom of the upper limits of the corresponding what's solutions.
As follows from the results of the experiments are given in table.2, the content of the components of the proposed solution in the indicated amounts (solutions 2-4) can significantly reduce the moisturizing ability of a solution (0.4-0.6 cm/h), to reduce the surface tension at the boundary between the filtrate solution and oil to 2.5 and 4.4 mn/m and to increase the recovery factor of permeability cores to 74-87%.
Technical appraisal and economic benefits the proposed emulsion drilling fluid as compared with the prototype are the following: - the rate of hydration of clays P06.9 times less than that ensures the stability of the wellbore over a long period of time; - interfacial tension of the filtrate on the border with oil (  ) 4.8 times less than that creates good preconditions for improving the quality of drilling;- recovery coefficient of permeability (  ) 1.9 times, which ensures significantly less pollution of the productive formation and output to the potential output in the short term during the development wells.
Thus, as shown by laboratory and field tests, emulsion drilling fluid as compared with that allows you to successfully drill prone to landslides clay rocks and qualitatively to open the reservoir.
The hydrocarbon phase is 10-20 Surfactant complex action PKD-515 - 5-7 Starch PHYTO-RK - 3-4 MgCl2-5-10 KCl - 3-5 Calcium carbonate - 5-30 Mineralized water - the Rest
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