RU2044026C1 - Liquid phase of water-in-oil mud for utilizing geological deposits - Google Patents

Abstract

FIELD: mining industry. SUBSTANCE: inverted water-in-oil type muds for utilizing geological deposits, more particularly a hydrocarbon phase comprising an ester of monohydric alcohol with 2 to 12 aliphatic carbon atoms and of an aliphatically saturated monocarboxylic acid with 12 to 16 carbon atoms (55-95 wt) and having fluidity within a temperature range of 0 to 5 C and a viscosity of not greater than 50 MPa within said temperature range and also a crystallization temperature of lower than minus 10 C and a flash temperature of higher than 100 C. Said ester comprises as the monocarboxylic acid a linear acid of vegetable origin based on triglyceride derivatives of coconut and palm tree oil. The hydrocarbon phase may further comprise an ester of a monohydric alcohol with 2 to 12 aliphatic carbon atoms and of a monocarboxylic acid with 16 to 24 carbon atoms having one or several double bonds. EFFECT: improved properties of the liquid phase. 4 cl, 4 tbl

Description

 The invention relates to the field of invert drilling fluids for the development of geological deposits, and more particularly to the liquid phase of an invert drilling fluid such as water in oil.

 It is known to use an oil phase based on ester oils (estrols). So, oil-based drilling fluids use non-polluting oils. As non-polluting oils, both oil-free distillation fractions and vegetable oils such as peanut oil, soybean oil, linseed oil, corn oil, rice oil, and animal oils, such as whale oil, are used. All these essential oils of vegetable and animal origin are triglycerides of natural fatty acids that do not pollute the environment and, compared with hydrocarbon fractions, even free of aromatic hydrocarbons, have environmental advantages.

The studies underlying the invention have shown that the use of easily degradable oils of vegetable and / or animal origin, considered in the prior art, cannot be considered for practical reasons. The rheological properties of such oil phases for the temperature range of ^0-5 ° C to 250 ^{° C} and more are not achieved.

 The ester of isooctyl monohydroxy alcohol and purified tall oil acids are known. For the first time, the ester of monobasic alcohol and monobasic carboxylic acids indicated here is presented as equivalent to naturally occurring triglycerides and / or hydrocarbon fractions free of aromatic fractions.

 The invention is based on the idea that it is really possible to produce drilling fluids for wells of this type based on essential environmental oils with high environmental qualities, which, when stored and used, are equivalent to the best known inert flushing systems based on mineral oils, but have the added advantage of not polluting the environment . The invention is based on two essential ideas.

 Known triglycerides in the form of natural oils are unsuitable for the production of inert drilling fluids free of mineral oils, and esters of monofunctional carboxylic acids with monofunctional alcohols derived from these oils or fats are applicable.

 When used in practice, the esters of the kind described here behave differently from the previously used fractions of mineral oils based on pure hydrocarbons. These esterols from monofunctional components are partially hydrolyzed in practical use. In this case, free fatty acids are formed. They again react with alkaline components always present in drilling systems of this kind, for example, with an alkaline reserve for protection against corrosion, with the formation of the corresponding salts. Salts of strongly hydrophilic bases and acids often found in naturally occurring fats and oils with 16-24 carbon atoms in the molecule are substances that contribute to the production and stabilization of water-oil emulsions. The detergent industry makes extensive use of this property.

 The known liquid phase of an inert drilling fluid such as water in oil for the development of geological deposits, containing a hydrocarbon phase comprising a petroleum product, such as diesel fuel and an ester of unsaturated higher acid monohydric alcohol, and a dispersed phase.

 A disadvantage of the known liquid phase is the presence of an oil product in it, which adversely affects the environment, in particular during the development of oil and / or gas deposits on the continental shelf.

 The purpose of the invention is the elimination of the harmful effects of invert drilling fluid such as water in oil on the environment, in particular during the development of oil and / or gas deposits on the continental shelf.

This goal is achieved by the liquid phase of an invert drilling fluid such as water in oil containing a hydrocarbon phase comprising at least one ester and a dispersed aqueous phase, due to the fact that the hydrocarbon phase contains a monohydric alcohol ester as at least one ester 2-12 aliphatic carbon atoms and aliphatically saturated monocarboxylic acids having 12-16 carbon atoms, having a fluidity in the temperature range ^0-5 ° C, the following component ratio, wt. hydrocarbon phase 55-95; dispersed aqueous phase 5-45. In the temperature ^0-5 ° C has a specific ester ^at 50 not more than 50 mPa ˙ s, crystallisation temperature below ^-10 ° C and a flash point above 100 ° ^C. With a Brookfield viscosity

 The ester contained in the proposed liquid phase may be an individual compound or mixture of esters of identical or different structure.

 According to one preferred embodiment of the invention, the ester of monohydric alcohols with 2-12 aliphatic carbon atoms and an aliphatically saturated acid with 12-16 carbon atoms contains, as a monocarboxylic acid, a linear vegetable acid based on derivatives of coconut and palm oil triglycerides.

 According to another preferred embodiment of the invention, the ester of monohydric alcohols with 2-12 aliphatic carbon atoms and an aliphatically saturated monocarboxylic acid with 12-16 carbon atoms contains a monohydric alcohol with 4-10 aliphatic linear and / or branched carbon atoms as the alcohol residue of the ester.

The proposed liquid phase further comprises a monoatomic ether of 2-12 aliphatic carbon atoms and a monocarboxylic acid with 16-24 carbon atoms having one or more double bonds. These esters themselves preferably have a pour point below -10 ^C and in particular below -15 ° ^C. Due to the size of their molecules flash point has the desired value, i.e. above 100 ^o C. In addition, the Brookfield viscosity in the temperature range 0-5 ^o C is not more than 50 MPa ˙ s. The content of esters of unsaturated monocarboxylic acids in the proposed liquid phase is not more than 49% by weight of the hydrocarbon phase.

Known drilling fluids containing the proposed liquid phase have the following rheological characteristics: plastic viscosity (RU) in the range of 10-60 MPa, preferably from 15 to 40 MPa, yield strength (UR) in the range of 5-40 pounds / 100 ft ² , preferably 10-25 lb / 100 ft ^2, determined at 50 ° ^C. to determine these parameters and techniques used therein, and nature and content of special additives such inverse drilling fluids are indications in the art (handbook "Manual of drilling Fluid technology "firm" Baroid Drilling Fly iz Inc. ").

EXAMPLES EXAMPLE 1 230 ml of distilled complex hexyl ester of lauric acid having a flash point above 165 ^{° C,} the yield stress is less than -5 ^{° C,} density (20 ° ^C) 0,857-0,861 g / cm ^3, iodine value and acid each number below 1, water content below 0.3% and the following Brookfield viscosity, MPa м s: -5 ^о С 22.5-25.5; 2 ^° C 15-18; 5 ^about C 15-18; 10 ^about With about 15; 20 ^about 12-14, and 26 ml of water is used to obtain an invert drilling fluid such as water in oil, which contains the following target additives, g:
Organophilic Bentonite
(trade product GELTONE
Baroid Drilling Fluids Inc.) 6
Organophilic lignite (tor-
great product DURATONE
Baroid Drilling Fluids Inc.) 6 Lime 1
Water-in-oil emulsifier
(trade product EZ-MUL
Baroid Drilling Fluids Inc.) 6 Barite 345
Calcium Chloride as dihydrate 9.2
In a known manner, the plastic viscosity PV, yield strength (UR), and the amount of gel formed in pounds / 100 ft ^{2 are} determined in 10 seconds and 10 minutes. The viscosity is measured ^at 50 C using a Fann 35 viscometer company "Beroyd Flyuidz Drilling Inc". Measurements produce both on fresh material and on material held aging treatment for 16 hours at 125 ^C in the autoclave serving as a rotary kiln.

 Data on the properties of the fresh material and the past structure of the material are summarized in table. 1.

 PRI me R 2.

Example 1 is repeated with the difference that an invert drilling fluid of the following composition is prepared, g: Ester, ml 184 Water, ml 10
Organophilic Bentonite
(trade product GELTONE
Firm "Baroid Drilling Fluids Inc.") 2
Organophilic lignite (tor-
great product DURATONE
Firm "Baroid Drilling Fluids Inc.") 20 Lime 1
Water-in-oil emulsifier
(trade product EZ-MUL
Baroid Drilling Fluids Inc.) 10 Barite 568
Calcium Chloride as dihydrate 4.8
Data on the properties of fresh material and aged material are summarized in table. 2.

 PRI me R 3. 230 ml of a mixture of esters of 2-ethylhexanol and saturated fatty acids based on polm oil composition, wt.

C ₈ 3.5-4.5; C ₁₀ 3.5-4.5; C ₁₂ 65-70; C ₁₄ 20-24; C ₁₆ 2; 0.3-1 C _18, having a flash point above 165 ^{° C,} the yield strength of less than -10 ^{° C,} density at 20 ^C. flash 0.86 g / ^cm3, an acid value below 0.3 and the following Brookfield viscosity MPa ˙ s:
-5 ^about 20-22; 0 ^о С 16-18; 10 ^about With about 11; 20 ^about C 7-9, and 26 ml of water is used to obtain an invert drilling fluid such as water in oil, which contains the following target additives, g: Emulsifier (NVERMUL NT) 6
Organophilic bentonite commercial product GELTONE 6
Organophilic lignite of a commercial product DURATONE 12 Lime 1.5
Commercial Product Emulsifier EZ-MUL 6 Barite 346 Calcium Chloride as Dihydrate 9.2
Data on the properties of fresh material and aged material are summarized in table. 3.

Example 4. Repeat example 3 with the difference that an invert drilling fluid of the following composition is prepared, g: The above ester, ml 350 Emulsifier of commercial product EZ-MUL 20 Organophilic lignite of commercial product DURATONE 3 Lime 4 Organophilic bentonite commercial product GELTONE 6 Water, ml 234 Calcium chloride in the form of dihydrate 99 Barite 150
Data on the properties of fresh material and aged material are summarized in table. 4.

Claims (4)

LIQUID PHASE OF AN INVERT DRILLING WATER TYPE OF WATER IN OIL FOR DEVELOPMENT OF GEOLOGICAL DEPOSITS, containing a hydrocarbon phase comprising an ester and a dispersed aqueous phase, characterized in that it contains a carbonic ester of 12 monohydric alcohols and a monohydric alcohol 2 atoms and aliphatically saturated monocarboxylic acid with 12 to 16 carbon atoms, having fluidity in the temperature range from 0 to 5 ^o With the following ratio of components, wt. Monohydric alcohol ester with 2 to 12 aliphatic carbon atoms and an aliphatically saturated monocarboxylic acid with 12 to 16 carbon atoms 55 95
Dispersed aqueous phase 5 45
moreover, in the temperature range from 0 to 5 ^o C, the ether has a Brookfield viscosity of not more than 50 mPas and a crystallization temperature below minus 10 ^o C, and a flash point above 100 ^o C.  2. The phase according to claim 1, characterized in that the ester of monohydric alcohols with 2 to 12 aliphatic carbon atoms and an aliphatically saturated monocarboxylic acid with 12 to 16 carbon atoms contains, as a monocarboxylic acid, a linear vegetable acid based on derivatives of coconut and palm oil triglycerides.  3. The phase according to paragraphs. 1 and 2, characterized in that the ester of monohydric alcohols with 2 to 12 aliphatic carbon atoms and an aliphatically saturated monocarboxylic acid with 12 to 16 carbon atoms contains, as the alcohol residue of the ester, a monohydric alcohol with 4 to 10 aliphatic linear and / or branched carbon atoms.  4. The phase in paragraphs. 1 to 3, characterized in that it further comprises an ester of monoatomic alcohol with 2 to 12 aliphatic carbon atoms and a monocarboxylic acid with 16 to 24 carbon atoms having one or more double bonds.

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