EP3017014A2 - Procédé d'extraction de pétrole d'un gisement souterrain faisant appel à une composition (z) - Google Patents

Procédé d'extraction de pétrole d'un gisement souterrain faisant appel à une composition (z)

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Publication number
EP3017014A2
EP3017014A2 EP14734505.2A EP14734505A EP3017014A2 EP 3017014 A2 EP3017014 A2 EP 3017014A2 EP 14734505 A EP14734505 A EP 14734505A EP 3017014 A2 EP3017014 A2 EP 3017014A2
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EP
European Patent Office
Prior art keywords
composition
weight
water
oil
petroleum
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP14734505.2A
Other languages
German (de)
English (en)
Inventor
Vladimir Stehle
Altunina Liubov
Vladimir Kuvshinov
Ivan Kuvshinov
Stasyeva LIUBOV
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wintershall Dea GmbH
Institute of Petroleum Chemistry of Siberian Branch of Russian Academy of Sciences
Original Assignee
Wintershall Holding GmbH
Institute of Petroleum Chemistry of Siberian Branch of Russian Academy of Sciences
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wintershall Holding GmbH, Institute of Petroleum Chemistry of Siberian Branch of Russian Academy of Sciences filed Critical Wintershall Holding GmbH
Priority to EP14734505.2A priority Critical patent/EP3017014A2/fr
Publication of EP3017014A2 publication Critical patent/EP3017014A2/fr
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons

Definitions

  • the present invention relates to a method of extracting petroleum from a subterranean oil deposit using a composition (Z) and to using the composition (Z) as a petroleum production agent.
  • natural petroleum reservoirs petroleum is generally present in the voids of porous reservoirs which are closed to the earth's surface by impermeable facings.
  • underground oil reservoirs generally contain more or less saline water.
  • cavities in which the petroleum is present it may be very fine cavities, capillaries, pores or the like.
  • the cavities may for example have a diameter of only one micrometer.
  • the water that is present in the underground oil reservoirs is also referred to as reservoir water or formation water.
  • the salinity of the formation water is often 5 to 20 wt .-%.
  • the dissolved salts may, for example, be alkali metal salts, but in some deposits the formation water also contains relatively high levels of alkaline earth ions, for example up to 5% by weight of calcium ions and / or magnesium ions.
  • primary production after sinking the well into the subterranean deposit, the petroleum automatically streams to the surface through the borehole due to the inherent natural pressure of the oil reservoir.
  • the autogenous pressure of the oil reservoir can be caused, for example, by gases present in the reservoir, such as methane, ethane or propane.
  • primary oil production can usually only produce 5 to 10% of the oil in the deposit. Thereafter, the autogenous pressure of the oil reservoir is no longer sufficient to recover oil from the underground oil reservoir by the primary oil production.
  • the secondary oil production is used.
  • additional drilling will be drilled (drilled) in the oil reservoir.
  • production wells are used to extract oil from the underground oil reservoir to the surface.
  • injection wells water is injected into the oil reservoir to maintain or increase the pressure of the underground oil reservoir.
  • the oil is slowly pushed through the cavities of the underground Erdöllager GmbH starting from the injection hole in the direction of the production bore.
  • the oil from the underground oil reservoir comes into the production well and is promoted to the surface, for example by means of pumps.
  • this method of secondary oil production works only as long as the cavities of the underground oil reservoir are completely filled with petroleum and the viscous petroleum is displaced by the water injected through the injection well compared to water. This state is shown by way of example in FIG.
  • FIG. 1 shows the state after the implementation of secondary methods for producing oil.
  • the injected water has displaced the petroleum (2) from the lower area of the cavity (3).
  • the low-viscosity water therefore flows through the lower portion of the cavity (3) in Figure 2.
  • the water takes the path of least resistance. It thus flows through the channel formed in the lower part of the cavity (3) of the underground Erdöllager Maschinen. From then on, the injected water will no longer displace oil but will flow from the injection well through the underground oil reservoir to the production well. From the production well then essentially only the injected water is promoted. This condition is also known as water breakthrough.
  • Tertiary oil production includes, for example, heat processes in which hot water or superheated steam is injected into the crude oil deposit. As a result, the viscosity of the petroleum is reduced. In addition, gases such as carbon dioxide or nitrogen can be used as flooding media for tertiary mineral oil production.
  • Tertiary oil production also includes processes that use suitable chemicals as auxiliaries for oil production. These can be used to influence the situation towards the end of secondary oil production, for example by flooding, and thereby also to extract crude oil, which until then has been stored in the underground oil reservoir in the cavities (3).
  • ⁇ represents the viscosity of the oil mobilizing fluid
  • v the Darcy velocity (flow per unit area)
  • ⁇ the interfacial tension between the petroleum mobilizing liquid and the petroleum
  • ⁇ the contact angle between petroleum and the rock of the underground oil reservoir (1).
  • the capillary number is, for example, in C. Melrose, CF Brandner, J. Canadian Petr. Techn. 58, Oct.-Dec. 1974, described. The higher the capillary number (N c ), the greater the mobilization of the oil and thus also the degree of extraction of the underground oil reservoir.
  • the capillary number (N c ) is generally in the range of approximately 10 -6 .
  • the capillary number (N c ) In order to mobilize additional petroleum from the underground oil reservoir, the capillary number (N c ) must be about 10 -3 to 10 -2 increase.
  • surfactant flooding This technique is also known as "surfactant flooding.”
  • Surfactants for example, which can lower the interfacial tension ⁇ to values of ⁇ 10 "2 mN / m are suitable.
  • the surrounding rock (1) of the underground oil reservoir is generally hydrophobic. That is, the oil present in the subterranean crude oil deposit preferably attaches itself to the surrounding rock (1) of the subterranean crude oil deposit.
  • FIG. 3a The state towards the end of the secondary oil production is shown here by way of example in FIG. 3a.
  • the oil (2) wets the rock surface (1).
  • FIG. 3 shows by way of example the behavior of the petroleum (2) when the rock layer (1) is hydrophilized.
  • FIG. 3 a shows the state of a largely hydrophobic rock layer (1).
  • FIG. 3e shows the state after the rock layer (1) has been converted by suitable chemicals into one of hydrophilic character.
  • Figures 3b to 3d show the intermediate steps in converting the character of the rock (1) from hydrophobic character to hydrophilic character.
  • the petroleum (2) contained in underground oil reservoirs generally has a boundary layer (2a) surrounding the petroleum (2).
  • This boundary layer (2a) is thus located between the petroleum phase (2) and the phase of the flood medium.
  • the boundary layer (2a) generally contains high molecular weight hydrocarbons, tars, asphaltenes, heteroaromatic compounds and mineral particles with a colloidal dispersity.
  • the boundary layer (2a) generally has a gel-like consistency with high viscosity.
  • the boundary layer (2a) thus interposes a mechanical barrier
  • the boundary layer (2a) thus hinders the above-described processes and effects for tertiary mineral oil production.
  • the boundary layer (2a) is shown by way of example in FIG.
  • the hydroxyl ion has been found to be most effective.
  • the number of negative charges in the surrounding rock (1) is increased and the number of adsorption centers capable of forming hydrogen bonds is reduced.
  • the hydrophilicity of the surrounding rock (1) must be increased and iii) the boundary layer (2a), which is located on the surface of the petroleum (2), must be destructured or destroyed.
  • alkaline surfactant solutions are described as flours for tertiary mineral oil production.
  • a pH of 9.0 to 10.5 has proven to be particularly advantageous.
  • colloidal suspensions of clay minerals which may be contained in the boundary layer (2a) have the lowest viscosity in this pH range of 9.0 to 10.5.
  • alkaline earth metal hydroxides such as calcium hydroxide and / or magnesium hydroxide are readily soluble in the pH range in the range from 9.0 to 10.5, so that precipitation of alkaline earth metal hydroxides from the formation or flood water present in the underground oil reservoir is largely prevented.
  • pH values of> 10.5 calcium or magnesium hydroxides precipitate out of the formation or flood water.
  • the cavities (3) can be blocked in the underground Erdöllageriere GmbH.
  • flooding agent alkaline solutions which have a large buffer capacity in the pH range from 9 to 10.5. This ensures that the pH of the flooding agent in the range of 9.0 to 10.5 is stable over larger concentration ranges.
  • the flooding medium receives a pH in the range of 9.0 to 10.5, even if it is diluted in the underground Erdöllager Maschinen by already existing formation water.
  • buffer solutions which have a high buffer capacity in the advantageous pH range of 9 to 10.5. These include, for example, polyphosphate (tripolyphosphate) buffer, silicate buffer, ammonia buffer and borate buffer.
  • the tripolyphosphate buffer is not suitable for use in oil reservoirs with temperatures of> 50 ° C.
  • the tripolyphosphate system hydrolyzes rapidly at these temperatures, forming trisodium polyphosphate, which leads to insoluble precipitates with calcium, magnesium and iron ions contained in the formation water and / or flood water.
  • the silicate buffer system is associated with technical difficulties, since sodium silicate is also hydrolyzed and prone to polycondensation.
  • a flocculant system containing sodium tetraborate is described.
  • Borax is dissolved in water for production.
  • the flocculant system also contains from 0.33 to 1% by weight of surfactants.
  • a disadvantage of this flooding agent system is that the sodium tetraborate (borax) used has only limited water solubility.
  • the flooding system in subterranean oil reservoirs, which have a high salt content in the formation water only limited use, since the sodium tetraborate is incompatible with the alkali or alkaline earth metals contained in the formation water.
  • the object of the present invention is thus to provide a process for the extraction of crude oil from a subterranean crude oil deposit which does not have the disadvantages described in the prior art or only to a lesser extent.
  • the object of the invention is to provide a composition (Z) which has a high buffer capacity in the pH range from 9.0 to 10.5.
  • the composition (Z) should be suitable as a means for oil production, in particular as a flooding agent for tertiary mineral oil production.
  • the composition (Z) should also be capable of destructing or destroying boundary layers (2a). With the composition (Z), moreover, the interfacial tension between the petroleum phase (2) and the phase of the composition (Z) should be lowered.
  • composition (Z) is also intended to convert the hydrophobic character of the surrounding rock (1) into a hydrophilic character.
  • the composition (Z) should also be suitable for use in petroleum reservoirs containing formation waters with a high salt content, that is to say with a high content of alkaline earth and alkali ions.
  • the density, viscosity, pH and freezing point of composition (Z) should be controllable over a wide range.
  • the composition (Z) should be inexpensive and easy to prepare and easy to handle.
  • composition (Z) is injected into at least one injection well and oil is taken from at least one production well, characterized in that the composition (Z) is obtained by mixing at least the following components
  • composition (Z) leads to an effective destructuring or destruction of the boundary layer (2a). With the composition (Z) and the method according to the invention becomes the interfacial tension between the petroleum phase and the phase containing the composition (Z) significantly reduced.
  • the hydrophobic character of the surrounding rock (1) of the underground oil reservoir is converted into a hydrophilic character.
  • the surrounding rock (1) is wetted with water, whereby the deposited on the surrounding rock (1) oil (2) is detached.
  • the composition (Z) thus an effective displacement of petroleum (2) from the underground oil reservoir is achieved.
  • the composition (Z) acts as a flooding agent and forces the oil from the injection well in the underground oil reservoir towards the production well. From the production well oil is extracted below.
  • composition (Z) is obtained by mixing at least the following components:
  • composition (Z) contains 0.5 to 5 wt .-% of at least one surfactant (component (iv)).
  • the present invention thus also provides a process in which the composition (Z) additionally contains the component (iv) 0.5 to 5 wt .-% of at least one surfactant, wherein the wt .-% - in each case based on the Total weight of the composition (Z).
  • the present invention thus also provides a process in which the composition (Z) is obtained by mixing at least the following components: (i) 1 to 30% by weight of a sodium borate,
  • composition (iv) 0.5 to 5 wt .-% of at least one surfactant is prepared, wherein the wt .-% - in each case based on the total weight of the composition (Z). Furthermore, it has proved to be advantageous if the composition (Z) 0.5 to 5 wt .-% of at least one surfactant (component (iv)) and beyond, 2 to 20 wt .-% urea (component (v)) contains.
  • composition (Z) additionally contains the components
  • composition (v) contains 2 to 20% by weight of urea, the weight percentages in each case being based on the total weight of the composition (Z).
  • the subject matter of the present invention is therefore also a process in which the composition (Z) is obtained by mixing at least the following components:
  • a sodium borate is used according to the invention.
  • the term "sodium borate” encompasses all the sodium salts of boric acid.
  • the sodium salts of boric acid are known to the person skilled in the art.
  • the sodium salts of boric acid can be derived from orthoboric acid (H 3 B0 3 ), metaboric acids (HBO 2 ) and polyboric acids. It is also known to the person skilled in the art that some polyboronic acids are not isolable in free form, but that their sodium salts can be isolatable, and the sodium borates can also contain water of crystallization
  • Preferred sodium borates according to the invention are sodium tetraborates.
  • Sodium tetraborates are known in the art. They can contain crystal water.
  • a sodium borate is used selected from the group consisting of sodium tetraborate (Na 2 B 4 0 7 ), sodium tetraborate pentahydrate (Na 2 B 4 0 7 ⁇ 5H 2 0), sodium tetraborate decahydrate (NaB 4 0 7 ⁇ 10H 2 O) and mixtures of these Tetra sodium borates.
  • sodium borate compound particularly preferred is sodium tetraborate decahydrate (Na 2 B 4 0 7 ⁇ 10H 2 O).
  • Sodium tetraborate (Na 2 B 4 O 7 ) is also referred to as disodium tetraborate.
  • the sodium tetraborate may contain water of crystallization.
  • Anhydrous sodium tetraborate (Na 2 B 4 0 7 ) carries the CAS number 1330-43-4.
  • Sodium tetraborate decahydrate (NaB 4 0 7 ⁇ 10H 2 O) carries the CAS number 1303-96-4.
  • Another embodiment of the chemical formula of the sodium tetraborate decahydrate is (Na 2 [B 4 O 5 (OH) 4 ] ⁇ 8H 2 O).
  • the sodium tetraborate decahydrate is also referred to as borax or Tinkal or sodium borate.
  • sodium borate comprises, as described above, all the sodium salts of boric acid.
  • Sodium tetraborate pentahydrate (Na 2 B 4 0 7 ⁇ 5H 2 0) carries the CAS number 12179-04-3.
  • the subject matter of the present invention is therefore also a process in which the composition (Z) is obtained by mixing at least the following components:
  • composition (iii) from 10 to 50% by weight of water is produced, the percentages by weight in each case being based on the total weight of the composition (Z).
  • the subject matter of the present invention is therefore also a process in which the composition (Z) is obtained by mixing at least the following components:
  • composition (Z) is obtained by mixing at least the following components:
  • the sodium borates used according to the invention are only sparingly soluble in water.
  • 100 g of water dissolve at room temperature (20 ° C), for example, 2.7 g of borax.
  • the solubility of borax in glycerol is significantly higher.
  • At 15 ° C dissolve 60 g of borax in 100 g of glycerol.
  • the solubility of the borax decreases.
  • 100 g of a mixture containing 98.5 wt .-% glycerol and 1 5 wt .-% water are at 20 ° C 52.6 g of borax soluble.
  • 47.2 g of borax are soluble at 20 ° C.
  • boric acid can form under the action of water. This is shown below by way of example with reference to the sodium tetraborate (anhydrous) and the example of the sodium tetraborate pentahydrate:
  • boric acid forms from sodium borate when dissolved in water. It is believed that this boric acid with glycerin forms a glycerol-boric acid complex of the formula (I).
  • the glycerol-boric acid complex of formula (I) and its salts are much more soluble in water than boric acid or borax.
  • the glycerol-boric acid complex of the formula (I) is derived formally by a complex formation reaction of boric acid (B (OH) 3 ) with two molecules of glycerol (IUPAC name 1, 2,3-propanetriol).
  • the complexation reaction follows the following reaction equation: CH 2 OH
  • Boric acid is a very weak monobasic acid. It acts not as a proton (H + ) donor but as an (OH -) acceptor.
  • the glycerol-boric acid complex of the general formula (I) comprises all possible isomers which formally derive from the empirical formula
  • the general formula (I) comprises in particular the following isomers Ia to Ie.
  • the glycerol-boric acid complex (I) generally comprises Na + as the counterion.
  • the percentages by weight with respect to component (i) refer to anhydrous sodium tetraborate. In the case where sodium tetraborate containing water of crystallization is used, the weight of the water of crystallization is not attributed to the component (i). Optionally contained water of crystallization is added to the weight% of the water contained in the composition (Z).
  • the weight percentages with respect to component (ii) are based on pure glycerine.
  • a mixture containing glycerol and water is used as the glycerine for the preparation of the composition (Z)
  • the water contained in this mixture is added to the weight% of the water contained in the composition (Z).
  • the glycerin contained in the composition (Z) may be from any sources. So-called crude glycerol (R) is preferably used as glycerol.
  • Raw glycerine (R) is derived from natural fats or oils. Glycerin is part of all animal and vegetable fats / oils. Crude glycerine (R) is produced in large quantities as a by-product of biodiesel production. To produce biodiesel, vegetable oils such as rapeseed oil are transesterified with methanol.
  • a fat / oil molecule (triacylglyceride) is reacted with three molecules of methanol to glycerol and three fatty acid methyl esters.
  • Ten liters of vegetable oil and one liter of methanol produce about ten liters of biodiesel and one liter of raw glycerine (R).
  • Preferred crude glycerin (R) has the following composition:
  • glycerin in the composition (Z) has the advantage of lowering the freezing point of the composition (Z). For example, a composition (Z) containing 66.7% by weight of glycerin freezes only at -46.5 ° C.
  • the use of glycerine makes it possible to vary the viscosity of the composition (Z). The more glycerin in the composition (Z) is contained, the higher the viscosity of the composition (Z).
  • the viscosity of the composition (Z) can be in the range of 1, 0 to 1, 5 mPas.
  • the composition (Z) may also have higher viscosities. This can be achieved for example by the use of thickeners.
  • the density of the composition (Z) can be varied by the use of glycerol.
  • the composition (Z) may have a density in the range of 0.96 to 1.3 g / cm 3 .
  • the weight percentages of the water contained in the composition (Z) are based on the total sum of the water contained in the composition (Z).
  • Water of crystallization, optionally contained in sodium tetraborate, and water which, via the glycerol (for example, crude glycerol (R)) used to prepare the composition (Z), is converted into the composition (Z) is introduced, this is attributed to the wt .-% - information with respect to water of the composition (Z).
  • nonionic, anionic and cationic surfactants and mixtures thereof are suitable.
  • Nonionic surfactants are, for example, ethoxylated mono-, di- and trialkylphenols, ethoxylated fatty alcohols and polyalkylene oxides.
  • polyalkylene oxides preferably C 2 -C 4 -alkylene oxides and phenylsubstituted C 2 -C 4 -alkylene oxides, especially polyethylene oxides, polypropylene oxides and poly (phenylethyleneoxides), especially block copolymers, in particular polypropylene oxide and polyethylene oxide blocks or poly (phenylethylene oxide) and Polyethylene oxide blocks having polymers, and also random copolymers of these alkylene oxides suitable.
  • Such Alkylenoxidblockcopolymerisate are known and commercially z. B. under the name Tetronic and Pluronic (BASF) available
  • Typical anionic surfactants are, for example, alkali metal and ammonium salts of alkyl sulfates (alkyl radical: C 8 -C 12 ), of sulfuric monoesters of ethoxylated alkanols (alkyl radical: C 12 -C 18 ) and ethoxylated alkylphenols (alkyl radicals: C 4 -C 12 ) and of alkylsulfonic acids ( Alkyl radical: C 12 -C 18 ).
  • Suitable cationic surfactants are, for example, C 6 -C 18 -alkyl, alkylaryl or heterocyclic radicals, primary, secondary, tertiary or quaternary ammonium salts, pyridinium salts, imidazolinium salts, oxozolinium salts, morpholinium salts, propylium salts, sulfonium salts and phosphonium salts.
  • the composition (Z) may further contain other conventional additives in amounts of 0.1 to 5 wt .-%.
  • Further customary additives are, for example, thickeners in order to adjust the viscosity of the composition (Z).
  • Suitable thickeners are selected from the group consisting of synthetic polymers, such as polyacrylamide or copolymers of acrylamide and other monomers, in particular sulfonic acid-containing monomers and polymers of natural origin such as glycosyl glucans, xantans and diutans.
  • the percentages by weight with respect to the composition (Z) relate in each case to the total weight of the composition (Z), the sum of the percentages by weight in each case being 100% by weight.
  • the composition (Z) is prepared in a preferred embodiment by mixing the components described above. The mixing can be done for example in a stirred tank. For this purpose, all components are fed to the stirred tank and subsequently mixed. The order of addition of the components is arbitrary. To accelerate the preparation of the composition (Z), the
  • the composition (Z) has a pH in the range of 9.0 to 10.5. In a further preferred embodiment, the composition (Z) has a high buffer capacity in the pH range from 9.0 to 10.5.
  • the present invention thus also provides a process in which the composition (Z) has a pH in the range from 9.0 to 10.5.
  • a further subject matter of the present invention is a process characterized in that it comprises the following process steps: a) injecting a flooding medium (F) containing at least 70% by weight of water into the injection well and removing oil from the production well, b) Interruption of the injection of the flood medium (F),
  • the flooding agent (F) is different from the composition (Z).
  • the flooding agent (F) preferably contains at least 80% by weight of water.
  • the flooding agent (F) may also contain other conventional additives. Examples of further customary additives are, for example, the thickeners described for the composition (Z).
  • the above-described surfactants, and optionally glycerol and / or urea may be added to the flooding agent (F).
  • process steps a) to e) can be repeated as often as desired. That is, after completion of process step e) according to process step f) the Injecting the flooding agent (F) interrupted. Thereafter, the injection of the composition (Z) according to process step c) is continued.
  • the present invention also relates to the composition (Z) as such.
  • the composition (Z) the above-described embodiments and preferences for the method for extracting oil from an underground oil reservoir apply accordingly.
  • the present invention thus also provides a composition (Z) comprising water and a glycerol-boric acid complex of the formula (I).
  • the present invention furthermore relates to a composition (Z), wherein the composition (Z) is obtained by mixing at least the following components:
  • the present invention furthermore relates to a composition (Z), wherein the composition (Z) is obtained by mixing at least the following components:
  • the present invention furthermore relates to a composition (Z), wherein the composition (Z) is obtained by mixing at least the following components: (i) 1 to 30% by weight of a sodium borate,
  • the present invention further provides a composition (Z), characterized in that the formula (I) contains at least one of the isomers selected from the group consisting of the isomers Ia, Ib, Ic, Id and le.
  • the present invention also provides a composition (Z) having a pH in the range of 9.0 to 10.5.
  • the composition (Z) has a high buffering capacity in the pH range of 9.0 to 10.5.
  • composition (Z) is used as a means for oil production from an underground Erdöllager Maschinen.
  • the statements made above and preferences with regard to the method and the composition (Z) apply accordingly.
  • the composition (Z) is used as a flooding agent.
  • the flooding agent drives the oil in the underground oil reservoir from the injection well toward the production well. Oil is extracted from the production well.
  • Particularly preferred according to the invention is the use of the composition (Z) as a flooding agent for tertiary mineral oil production.
  • composition (Z) With respect to the composition (Z), the previously described embodiments and preferences apply.
  • Figures Figure 1 state before performing secondary delivery methods
  • FIG. 7 shows the solubility of sodium tetraborate (borax) as a function of the glycerol concentration at different temperatures. From Figure 7 it can be seen that the solubility increases with increasing glycerol concentration. The solubility of borax also increases with increasing temperature.
  • FIG. 8 shows the dependence of the density of the composition (Z) as a function of the glycerol concentration. From Figure 8 it can be seen that the density of the composition (Z) increases with increasing glycerol concentration.
  • FIG. 9 shows the development of the petroleum feed rate when using the method according to the invention. FIG. 9 is explained in more detail in the following example.
  • the present invention is further illustrated by, but not limited to, the following example.
  • composition (Z) was tested using a heterogeneous deposit model.
  • a column was filled with an artificial drill core, which simulates the surrounding rock (1), in which petroleum (2) in cavities (3) is included.
  • the column had a length of 300 mm and a diameter of 20 mm.
  • composition (Z) a mixture containing 2% by weight of a complex surfactant, 10% by weight of borax, 80% by weight of glycerin and 8% by weight of water was used.
  • the glycerol source used was crude glycerol (R).
  • the complex surfactant is a partially sulfonated hydroxyethyl isononyl phenol based on propylene trimer with an oxyethylation of 12 with the addition of ethylene glycol (25-30% by weight). This is a hydrophobic emulsion consisting of several components: liquid hydrocarbon (petroleum, gasoline, etc.), emulsifier, hydrophobizer and an aqueous solution of calcium chloride.
  • An artificial core of pressed sand is made in a metal tube.
  • the pore volume of the core is measured. Thereafter, the core is saturated with petroleum.
  • the artificial core was subsequently treated first with water, then with composition (Z) and then again with water under pressure. During the experiment, every five minutes the temperature, the inlet and outlet pressure at the column, the amount of oil displaced from the column and the amount of water or composition (Z) removed from the column were taken is being measured.
  • the curve, with the white squares in Figure 9 indicates the mobility of the liquids, that is, the water or the composition (Z).
  • the curve with the black squares indicates the oil displacement coefficient (Kd).
  • the curve with the white triangles indicates the pressure gradient.
  • the pressure gradient initially increases sharply, but subsequently decreases continuously.
  • the mobility of the liquids initially decreases after injection of the composition (Z).
  • the mobility of the fluids increases continuously and, at the end of the experiment, is well above the initial value before injection of the composition (Z).
  • the oil displacement coefficient increases significantly after injection of the composition (Z) and subsequently remains constant at a level well above the level before injection of the composition (Z).

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Abstract

L'invention concerne un procédé d'extraction de pétrole d'un gisement souterrain faisant appel à une composition (Z) ainsi que l'utilisation de cette composition (Z) en tant qu'agent pour l'extraction de pétrole.
EP14734505.2A 2013-07-04 2014-07-03 Procédé d'extraction de pétrole d'un gisement souterrain faisant appel à une composition (z) Withdrawn EP3017014A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14734505.2A EP3017014A2 (fr) 2013-07-04 2014-07-03 Procédé d'extraction de pétrole d'un gisement souterrain faisant appel à une composition (z)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP13175169 2013-07-04
EP14734505.2A EP3017014A2 (fr) 2013-07-04 2014-07-03 Procédé d'extraction de pétrole d'un gisement souterrain faisant appel à une composition (z)
PCT/EP2014/064174 WO2015001016A2 (fr) 2013-07-04 2014-07-03 Procédé d'extraction de pétrole d'un gisement souterrain faisant appel à une composition (z)

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EP3017014A2 true EP3017014A2 (fr) 2016-05-11

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US (1) US20160168446A1 (fr)
EP (1) EP3017014A2 (fr)
CA (1) CA2916581A1 (fr)
RU (1) RU2016103484A (fr)
WO (1) WO2015001016A2 (fr)

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US11377586B2 (en) 2018-07-31 2022-07-05 Chevron U.S.A. Inc. Use of a borate-acid buffer in oil and gas operations

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US11377586B2 (en) 2018-07-31 2022-07-05 Chevron U.S.A. Inc. Use of a borate-acid buffer in oil and gas operations

Also Published As

Publication number Publication date
US20160168446A1 (en) 2016-06-16
RU2016103484A (ru) 2017-08-09
CA2916581A1 (fr) 2015-01-08
WO2015001016A3 (fr) 2015-03-19
WO2015001016A2 (fr) 2015-01-08

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