Method for oil bed extraction

FIELD: oil extractive industry.

SUBSTANCE: method includes pumping of Sulfacella water dispersion into bed through force well and extraction of oil through extracting well, said dispersion additionally containing non-ionogenic surfactant AF9-12 with following ratio of components, in percents of mass: Sulfacella 0.5-1, AF9-12 0.01-0.1, water- the rest, while, before pumping of said dispersion mineralized water is pumped with total mineralization until 290 g/l in amount of 10% from volume of said dispersion, when pumping said dispersion prepared in fresh water, drain water is previously pumped, and when pumping said dispersion made from drain or bed water, bed water is previously pumped. For preparation of said dispersion fresh, drain or bed water is used with mineralization till 290 g/l.

EFFECT: higher efficiency.

2 cl, 2 tbl

 

The invention relates to the oil industry, in particular to methods development of terrigenous laminated flooding of oil reservoirs.

There is a method of developing oil deposits, which are periodic pumping water dispersion containing a mixture of bentonite powder and a water-soluble polymer. As the polymer used polyacrylamide or cellulose ethers (U.S. Pat. Of the Russian Federation No. 2136872, E 21 In 43/22, publ. 10.09.99.). The disadvantage of this method when the oil reservoir is low displacement efficiency of oil due to the deterioration of reservoir properties reservoir in the claying of reservoir rocks and low Neftekhimiya properties of this composition.

There is a method of developing a petroleum reservoir, comprising sequential injection into the oil reservoir of an aqueous solution of carboxymethyl cellulose (CMC) 0.5 to 2%concentration, containing 0.1-3% clay and an aqueous solution of nonionic surfactant (nonionic surfactants) 7-15%concentration, containing 0.1-3% clay. (U.S. Pat. Of the Russian Federation No. 1739695, E 21 In 43/22, 10.01.90, bull. No. 1). The disadvantages include the high concentration of nonionic surfactants and irreversible clogging collectors clay suspension. In addition, CMC is a simple ester of cellulose glycolic acid and water solution behaves as polyelectrolytes the viscosity of CMC solutions is strongly dependent on pH and ionic composition of the medium.

Know the use of the composition for oil-containing polyacrylamide (PAA), nonionic surfactant and water (A.S. USSR №1544958, E 21 In 43/22, 23.02.90, bull. No. 7). This composition when it is used for the development of oil reservoir low oil-driving properties due to increased degradation of polyacrylamide, due to the high shear stresses in the bottomhole formation zone. The solutions of PAA greatly reduced frictional properties when in contact with mineralized water, which reduces the efficiency of oil displacement from the reservoir.

There is a method of developing oil fields (U.S. Pat. Of the Russian Federation No. 2060373, E 21 In 43/22, 20.05.96, bull. No. 14), involving the injection of an aqueous solution of polyacrylamide and a surfactant, which is used as a biological surfactant CSAS - a waste product of bacteria of the genus Pseudomonas aeruginosa S-7 when the mass ratio of polyacrylamide and biological surfactants of BPAV) 1:2,5 respectively. The method is carried out on the fields with saline water with a salt content of 140 g/l

The disadvantage of this method is low efficiency due to poor oil-driving and nefetmash properties of aqueous solution of polymer and surfactant. Despite the high concentration of BPV, which reduces the surface tension of the water only up to 30 mn/m In addition, this method is expensive imported polymer. All this leads to increased economic costs.

The closest analogue is the way of the development of oil formation comprising pumping into the reservoir rim water dispersion of Alfacell SP from 0.001 to 1 wt.% via the injection well and oil through the production well by the RF patent № 2136872, E 21 In 43/22, 10.09.1999.

The technical result of the claimed invention is to increase the efficiency of the method by improving the oil-driving and nefetmash properties of aqueous solution of polymer and surfactant, and reduce economic costs due to the use of cheaper and more available reagents.

This object is achieved in that in the method of mining oil formation comprising pumping into the reservoir rim water dispersion of Alfacell SP via the injection well and oil through the production well, the dispersion additionally contains a nonionic surfactant, nonionic surfactants AF9-12 in the following ratio of reactants, wt.%:

SP 0,5-1

AF9-12 0,01-0,1

water the rest,

and before injection of the specified rim download predoorock saline water with a total mineralization of up to 290 g/l in the amount of 10% by volume of the specified rim,download the specified rim, cooked in fresh water, pumped predoorock from waste water, and when the download of the specified rim, prepared to waste or formation water, pumped predoorock from produced water.

To prepare the specified dispersion using fresh, wastewater or produced water with a salinity of up to 290 g/l

Alfacell produced according to TU 2231-013-32957739-01 JSC polycell”, , Vladimir. Alfacell is a nonionic polymer, obtained by the action of ethylene oxide on alkaline wood pulp. Alfacell is readily soluble in water. Know the use of Alfacell as a reagent for the limitation of the water in the wellbore area and for increasing the viscosity of the polymer-dispersed system.

As the nonionic surfactants used ethoxylated alkyl phenol-based propylene trimer AF9-12, where 9 is the number of carbon atoms in the alkyl radical, 12 is the number of moles of ethylene oxide attached to pray alkylphenol or the degree of oksietilirovannye. The nonionic surfactants AF9-12 on its physico-chemical properties relates to water-soluble surfactant, but soluble in organic solvents, including petroleum. The nonionic surfactants AF9-12 is produced by JSC “Nizhnekamskneftekhim” in THE 2483-077-05766801-98.

In the present method is pumped fringe aqueous dispersion Salvatella, nonionic surfactants AF9-12, which moves through the conduit and at what uboinoi area of the reservoir completely dissolves and comes to the oil reservoir in the form of an aqueous solution. In aqueous solution, Alfacell, nonionic surfactants AF9-12, interacting with each other, act on the formation as a single complex. On the one hand is Hydrophilidae the surface of the rock and thereby facilitated the penetration of an aqueous solution of VS and nonionic surfactants AF9-12 in low-permeability layers, which leads to a considerable increase in the coverage of the reservoir pressure, and thus increase oil-driving properties of the rim water dispersion of VS and nonionic surfactants AF9-12.

On the other hand, an aqueous solution of VS and nonionic surfactants AF9-12 reduces the interfacial tension between the oil/water”. For oil droplets that are larger than the pore size, ceteris paribus with decreasing interfacial tension under the action of an aqueous solution of VS and nonionic surfactants AF9-12 decreases the work required to move these drops of oil from the pores in the pore; reduced critical differential pressure required to push them through the narrow pores; reduced water consumption for eviction; increases the relative permeability of terrigenous layered heterogeneous formations for free dispersion of oil and water, as well as the number of displaced oil. Therefore, improved Neftekhimiya properties rims aqueous dispersion Salvatella, nonionic surfactants AF9-12.

The optimum ratio of reactants in the aqueous dispersion was defined expertise is mental. At lower concentrations Alfacell below 0.5% efficiency of oil displacement is small, and the increase in the concentration of SP in excess of 2% of the economically unprofitable. Also the decrease in the concentration of the nonionic surfactants AF9-12 below 0.01% does not lead to a significant reduction of interfacial tension, as the increase in the concentration of the nonionic surfactants AF9-12 higher than 0.1%.

When pumped into the reservoirs indicates that a water dispersion of VS and nonionic surfactants AF9-12 cooked in fresh water, create predoorock from waste water, and when the download fringe water dispersion of VS and nonionic surfactants AF9-12 prepared to waste or formation water, create predoorock from produced water with a total mineralization of up to 290 g/l in the amount of 10% of the volume of the rim. This leads to an increase of viscosity of an aqueous solution of VS and nonionic surfactants AF9-12 in the reservoir, which leads to decreased mobility solution, to increase the resistance factor and the residual resistance factor and to increase oil recovery.

The preparation of an aqueous dispersion of VS and nonionic surfactants AF9-12 on freshwater, wastewater and produced water with a salinity of 290 g/l allows you to expand the technological capabilities of the method.

The economic efficiency of the method is also improved by reducing the surfactant concentration and the use of relatively inexpensive, available home agents.

The proposed method includes the totality of the substantial characteristics, not known from the patent and scientific literature, allows to obtain a new technical result. Therefore, we can conclude that the proposed technical solution has novelty and inventive steps.

The proposed method is practically feasible, applicable when using standard process equipment for carrying out work to increase oil recovery.

An aqueous solution of VS and nonionic surfactants AF9-12 in the laboratory is prepared as follows. First dissolve Alfacell-1 mark 30 with mass fractions of the basic substance 40% with constant stirring with a mechanical stirrer RW-20 with a speed of 300 Rev/min Then the solution Alfacell-1 is payable estimated amount of nonionic surfactants AF9-12. The solutions were prepared in fresh water (R. Kama), on the model of waste water with a salinity of 100 g/l and the density 1,070 g/cm3and on the model of formation water with a salinity of 290 g/l and the density of 1,180 g/cm3.

General physic-chemical properties of polymer solutions SP, nonionic surfactants AF9-12 and their mixtures are presented in table 1.

Screen factor (SF) characterizes the viscoelastic properties and the viscosity of the macromolecular solutions, and interfacial tension (σ) is the interaction energy of two liquids.

From table 1 it is seen that the screen factor and viscosity of aqueous solutions of Alfacell in fresh water in the model wastewater and produced water does not undergo significant changes when mixing them with the ethoxylated alkyl phenol. Addition of nonionic surfactants AF9-12 leads to the decrease of the interfacial tension of an aqueous solution of VS and nonionic surfactants AF9-12 to values σ pure solution of nonionic surfactants AF9-12. The degree of the influence of nonionic surfactants AF9-12 on the technological characteristics of the development of oil deposits is directly proportional to the decrease in σ due, in turn, the adsorption of nonionic surfactants AF9-12 at the interface between oil and water”. Table 1 shows that at concentrations of VS and nonionic surfactants AF9-12 1%+0,005%, the interfacial tension of an aqueous solution is reduced to 10 mn/m, which is not sufficient to effectively increase nefetmash properties. Increasing the concentration of the nonionic surfactants AF9-12 to 2.5% in aqueous solution VS and nonionic surfactants AF9-12 does not fold decrease the amount of σthat leads to wasteful use of this feature. Therefore, the recommended concentration range of nonionic surfactants AF9-12 in aqueous solution VS and nonionic surfactants AF9-12 equal to from 0.01% to 0.1%.

When switching on waste and produced water, as can be seen from table 1, rheological and surface-active properties of the original aqueous solutions of the polymer Alfacell, nonionic surfactants AF9-12 and their mixture is not particularly limited, and the viscosity increased, especially noticeable on the model of the reservoir water. Therefore, if there is no source of fresh water, these solutions can be prepared in water or on the square is stoway with General mineralization to 290g/HP







Table 1
№ p/pAqueous solutionsWaterConcentration %Screen factor

dad
Viscosity, MPa*sInterfacial tension (σ), mn/m
1234567
1The nonionic surfactants AF9-12press.0,010,991,165,48
2The nonionic surfactants AF9-12m tbsp. water0,011,021,366,66
3The nonionic surfactants AF9-12press.0,11,011,142,52
4The nonionic surfactants AF9-12m tbsp. water0,11,00of 1.342,36
5Alfacellpress.0,51,943,123,45
6AlfacellMST water0,5of 2.263,8322,37
7Alfacell press.1EUR 7.578,7220,38
8Alfacellm tbsp. water15,9610,8919,39
9AlfacellM. stratum. water18,3517,1319,49
10SP+nonionic surfactants AF9-12press.0,5+0,011,983,216,13
11SP+nonionic surfactants AF9-12m tbsp. water0,5+0,012,193,946,32
12SP+nonionic surfactants AF9-12press.0,5+0,12,03,32,66
13SP+nonionic surfactants AF9-12mscode0,5+0,12,173,862,33
14SP+nonionic surfactants AF9-12press.1+0,005of 5.688,629,66
15SP+nonionic surfactants AF9-12mscode1+0,0056,0010,8810,4
16SP+nonionic surfactants AF9-12press.1+0,01 8,616,05
17SP+nonionic surfactants AF9-12mscode1+0,015,49there is a 10.036,4
18SP+nonionic surfactants AF9-12press.1+0,15,08,612,72
19SP+nonionic surfactants AF9-12mscode1+0,15,989,892,38
20SP+nonionic surfactants AF9-12mblast. water1+0,110,919,813,93
21SP+nonionic surfactants AF9-12press.1+0,256,208,772,09
22SP+nonionic surfactants AF9-12mscode1+0,256,9510,531,99

The method of developing a petroleum reservoir as follows. Selected pilot site for injection rim water dispersion of VS and nonionic surfactants AF-12, presented Devonian Sandstone reservoirs of the horizon, with production watercut 30-98%, with pickup injection wells not less than 300 m3/day. and with oil viscosity from 3 to 300 MPa·C. First created predatory of the article who offered any of formation water with total mineralization of up to 290 g/l in the amount of 10% of the volume of the rim. The injection of water dispersion of the SP(0.5 to 1%), nonionic surfactants AF-12(0,01-0,1%) lead by the dosing calculated quantity of water-soluble polymer, Alfacell in the form of a powder in a stream of water coming from the pump units, and through the intermediate tank where you enter the nonionic surfactants AF9-12, pumped water dispersion in the injection wells. Create a rim water dispersion of VS and nonionic surfactants AF9-12 in the amount of not less than 10% of the pore volume of the reservoir. After you create the rim water dispersion of VS and nonionic surfactants AF9-12 carry out the flooding in normal mode.

The effectiveness of the method was determined experimentally. To determine oil-driving and nefetmash properties of the proposed method was carried out comparative tests on filtration of liquids through the natural cores for laboratory computerised pump installation Core Laboratories (USA). Used standard cores Devonian terrigenous rocks with a diameter of 2.7-3.0 cm and a length of 3.5 to 4.0, see

Research methodology consisted in the following. Cores were extracted in the apparatus of Soxlet alcohol-benzene mixture was dried to constant weight, was determined by their permeability, porosity. Created initial water saturation by centrifugation at 5000 rpm for 30 minutes

After degassing core held filtering zhidkostyei the core in the following sequence:

filtering surface anhydrous Devonian oil with a viscosity of 18 MPa·C, density of 867 kg/m3at 20°With 50 cm3measurements of pressure drop across each 5 cm3filtered through the core oil,

the displacement of oil from cores of fresh water or a model wastewater in a quantity of 50 cm3,

filtering researched solution of 50 cm3,

filtering water in a quantity of 50 cm3,

- filtration of water in the opposite direction in the amount of 30 cm3,

filtering 100 cm3jet fuel for extraction of residual oil.

On the basis of the obtained data was calculated target displacement ratio of oil from the core (Quit.), the resistance factor (FS) and the residual resistance factor (CFC), which are the main performance parameters of the technology of enhanced oil recovery. The resistance factor is the ratio of water mobility to the mobility of the polymer solution by filtration in a porous medium. The residual resistance factor is the ratio of the mobility of the water prior to injection of the polymer solution to the mobility of water injected after the polymer solution. For the displaced oil will determine the increase of the displacement coefficient and calculate the increase in oil recovery. Basic filter and oil-driving properties of aqueous solutions of su who Hazell, The nonionic surfactants AF9-12 and their mixtures are presented in table 2.

Conducted experiments on the filtration of 0.1% solution of the nonionic surfactants AF9-12 fresh water through the natural cores and, separately, for the filtration of 1% solution of SP on fresh water. Main indicators (Quit., FS, CFC and increase oil recovery) oil-driving properties of these solutions are low.

Table 2
No.

p/p
Aqueous solutionsnK, MDm%Quit., %FSCFCIncrease oil recovery, %
10.1% NAWAF9-12 fresh water534621,065,51,05of 1.343,5
20,5% VS fresh water554219,263,86,8210,171,8
30.5% of VS on the model waste water534519,261,84,853,590
41% VS fresh water547019,869,14,84of 1.347,1
51% VS+0.1% of nonionic surfactants AF9-12 fresh water535519,784,74,182,4222,7
61% VS+0.1% of nonionic surfactants AF9-12 M. wastewater341517,885,1of 37.836,223,1
71% VS+0.1% of nonionic surfactants AF9-12 on press. water predatorily from wastewater337119,389,820,630,927,8
80.2% PAA+ 0.5% of BPAV350022,076,08,578,314,0

When the displacement of oil from natural cores by injection of an aqueous solution of Alfacell, nonionic surfactants AF9-12 fresh water obtained good results. The increase in oil recovery is 22.7 %, and waste water this indicator is equal to 23.1%. Based on these data, we can say, by mixing an aqueous solution of Alfacell, nonionic surfactants AF9-12 is difficult arithmetic addition of their properties, and formed a new complex with excellent oil-driving and neftehimichwsky properties. An aqueous solution of VS and nonionic surfactants AF912, it is injected in the form of water is isperia, affects the reservoir at the same time as a thickener and as surface-active substance.

Suddenly a new result obtained by the injection of the rim 1%water dispersion of Alfacell, nonionic surfactants AF9-12 in freshwater predatorily wastewater in the amount of 10% by volume to rim: coefficient of oil displacement was 89,8%, and the increase of oil recovery - 27,8%. Upon contact with the waste water increases the viscosity of the displacing system, which leads to decreased mobility solution, the result is increased resistance factor and the residual resistance factor. With the increase of the resistance factor and especially the residual resistance factor increases the reservoir sweep displacement. When values of the offset is greater than 2, according to the technical conditions time Giprovostokneft, displacing the composition provides increased value of the recovery factor. The resistance factor of the proposed method 2.1 times higher than that of the prototype, and the residual resistance factor of 3.3 times higher.

It is considered that when the ratio of oil displacement from the core more than 75% of the composition significantly increases the value of the recovery factor. From this point of view 0.5% solutions Alfacell both in fresh and waste water is not as effective, although they have high values of FS and FSA. Therefore, to reduce the concentration of Self the Zella below 0.5% is not advisable, and to increase greater than one is also not cost-effective because it leads to excessive polymer.

The increase in the recovery factor for injection rim water dispersion of VS and nonionic surfactants AF9-12 with predatorily of saline water with a total mineralization of up to 290 g/l in the amount of 10% of the volume of the rim is:

of 27.8% compared to conventional water flooding;

20.7 per cent compared with a pure solution Alfacell;

24.3 per cent compared with the solution of nonionic surfactants AF9-12;

13.8% compared with the equivalent.

Thus, the proposed method of developing a petroleum reservoir allows 13.8% increase in the recovery rate of terrigenous laminated layers, and reduce economic costs.

1. The way of the development of oil formation comprising pumping into the reservoir rim water dispersion of Alfacell SP via the injection well and oil through the production well, wherein the specified dispersion additionally contains a nonionic surfactant AF9-12 in the following ratio of reactants, wt.%:

SP0,5-1
AF9-12of 0.01-0.1
WaterThe rest,

and before injection of the specified rim download predoorock of mineralizes the authorized water with a total mineralization of up to 290 g/l in the amount of 10% by volume of the specified rim, when the download of the specified rim, cooked in fresh water, pumped predoorock from waste water, and when the download of the specified rim, prepared to waste or formation water, pumped predoorock from produced water.

Cab according to claim 1 characterized in that for the preparation of the specified variance using fresh, wastewater or produced water with a salinity of up to 290 g/l



 

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FIELD: oil and gas extractive industry.

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2 cl, 3 ex, 6 tbl, 2 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes placing water solution of carnallite ore, either modified, concentrated, or mixtures thereof, said solution is used at maximal for well temperature conditions concentration and is pumped in amount, necessary and enough for forming a hydraulic column in well shaft above ceiling of productive bed and along remaining shaft height well is filled with water up to mouth. Carnallite ore used has composition, in percents of mass: potassium chloride 20.5-21.5; sodium chloride 19.5-22.5; magnesium chloride 24.0-27.0; crystallization water 29.5-30.5. Modified ore has composition, in percents of mass: potassium chloride 23.0-29.5; magnesium chloride 31.8-46.0; crystallization water - the rest. Said water solution is prepared by dissolving ore in fresh technical water, drained from oil preparation plants, or in bed water. In case of dissolving in bed water, the latter is pumped from well at temperature 60-90°C. During perforation of well, value of technological liquid hydraulic column above productive bed ceiling is taken equal to (1.03-1.07)-(1.05-1.1)Pb, where Pb - productive bed pressure. Water solution of carnallite ore is used at density 1.23-1.37 t/m3. During use of said solution as working body of force wells it is used at density 1.05-1.20 t/m3, and solution also contains swelling inhibitor for argillaceous component of oil and gas bearing bed, like oxyethylenedendiphosphone acid, in amount 0.05-0.15% of used dissolved ore mass.

EFFECT: higher efficiency.

1 cl, 4 ex

FIELD: oil industry.

SUBSTANCE: method includes treatment of face area of oil bed by hydrophobic agent in organic solvent and pressing oil from collector with following delivery of oil from face area of product well for treatment of oil terrigenic bed, in form of hydrophobic agent solution of ethylene copolymer with vinylacetate in ethylbenzol or fraction thereof is used in relation 1:1 - 10, treatment of face area is performed with following ratio of components, in percents of mass: ethylene copolymer with vinylacetate 0.05-2.0, ethylbenzol or fraction 0.05-20.0, organic solvent - the rest.

EFFECT: higher efficiency.

2 tbl, 2 ex

FIELD: mining industry and alternative fuels.

SUBSTANCE: coal is affected by methanogenic consortium of microorganisms with culture medium utilizing continuous pumping of culture medium through wells and tank wherein methanogenic consortium of microorganisms with culture medium is placed. Tank is installed on the surface above wells and pumping of culture medium from the bottom of tank through methanogenic consortium of microorganisms. Process produces biogas and coal-water fuel.

EFFECT: increased yield of biogas to continuously effecting culturing of microorganisms.

1 dwg, 2 tbl

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