SU1228543A1 - Composition for enhancing oil yield of formations - Google Patents

Description

(46) 05.23.91. Bnot. No. 19

(21) 3789125/03 ,,

(22) 09/12/84

(71) Institute of Petroleum Chemistry, Siberian Branch of the USSR Academy of Sciences

(72) L.K.Altunina, V.A.Kuvshinov, Z.A.Rozhenkova A.I.Vashurkyn

and A.S.Kasov

(53) -622.276 (088.8)

(56) USSR author's certificate

9 880069, class E 21 B 43/22, 1979.

USSR Author's Certificate 9 1136522, cl. E 21 B 43/22 ,. 1983

(54) (57) COMPOSITION FOR POVSHSHNIYA OIL RECOVERY based nonionic surfactant ethoxylated alkipfenolov OP-Yu and anionakt10nogo poverhnostnoyktivnogo prophetic tv and d, idetsnlsulfosuktsinata sodium or apkansulfanata natrp and water or formation water, the difference ayuschiys that, with the purpose of increasing the oil displacement ratio, in addition to it. d t sodium tetraborate and boric acid with the following ratio of components, wt.%:

Oxyethylated alkylphenols OPCHO, YO

Didetsulfosuccinate sodium

or sodium alkanesulfonate 0.05-0.33

Sodium tetraborate 1,, 0. Boric acid 1,, 0

Water or formation

water Else "The invention relates to an oil tank of the existing industry and may be used for the recovery of oil recovery from the secondary and tertiary methods of oil and gas production. The purpose of the invention is to increase the oil displacement coefficient. Essential ffl of this costaaeldets introduction to the known composition of boron Klslot borax at and concentrates% by mass. The composition provides oil recovery at high apastes teMrtepaTypax Used substances: OP-1 O - xenated alkylsenses / LY; . GOST 8433-8 j tetraborate on ri (borax) GOST 842S; -77; boron c-acid, TU 48--0 70I sodium alkyl sulfonates (volgbnat) (CnHj ,,) CHSOgNa where - the 1st to the 17th composition of the main substance - 40%, MRU 6-01-39--65 | d1-shchetsilsulfosucts sodium (SDS) is ionogenny-i surfactant. The composition and structure of the LTOs were confirmed by eleventhly) tone analysis; layered chromatography and infrared spectrum scopia. The interfacial intake of compounds on the surface of the oil was determined mometrically by measuring the volume of the drop:, Neftypyatnash to the capacity of the compositions was determined by express-method under the conditions of dotimyv on the express installation, which is a glass thermostatic column Ki-i filled with quartz sand and the most valuable oil. The preparation of sand and columns was carried out in accordance with OST 39-070-78, the columns' Tegsheratura were adjusted from the drinking of the ultrathermostat and-10. Oil displacement was carried out by downloading a certain amount of produced water; then one or two equally large volumes of the composition under study and again with water. According to the data obtained, the coefficient of oil displacement was calculated at 9% Kg5% s of oil; the absolute ratio of oil displacement is Kg% (cct - 1mar. water and composition) .; absolute growth of goats (| oil oil displacement a.- Vaes Kg 5%; relative increase in pefted 543 2 by composition to the amount of oil remaining after displacement with water, Example. Take g of OP-10, 2.0 g of sodium didecyl sulfosuccinate (sodium) , 20.0 g of borax and 20.0 g of boric acid and dissolved by heating 3,950 g of the reservoir water model of the Samotlor field with a density of p, 025 (29.3 g / l NaCl, 6.4 g / l 1.3 g / l MgCl1). A solution is obtained containing 0.8 wt.% OP-10, 0.2 wt.% SDS, 2.0 wt.% borax, 250 bas.7, boric acid and 95.0 bo, / formation water Interfacial tension and of the obtained solution at the boundary with the Samotlor oil field j of the BV formation, with a formation temperature of 79 ° C, is 0.14 mN / m. The cloud point of the composition is 95+ C. The crawling composition is used to displace the oil of the Samotlor field, the BV formation , at a reservoir temperature with a second, the flooding is carried out first with a single pore volume of the composition and again with plastic water. The increase in oil-removal coefficients is given in the table. EXAMPLE 2. Similarly to the example, take g (0.4 May L) OP-105 ° 1.0 g (0.1 wt.%) SDS | 20 g (2.sO wt.%) .20 g (2.0 wt.%) Of boric acid and dissolved when heated in 955 g (95.55 wt%) of the reservoir model of a reservoir, with a density of pz025. The interfacial tension is on the border with the oil of the Samotlor field in the BE formation, pr 70 ° C is KO mN / m. . The cloud point of the composition is 95 + 1 s. The resulting composition is used. For oil permeability 5 carried out analogously to the example. Growth . the coefficients of oil loss in the table, pp and me 3, 8.0 g (0, 8 wt.%) 2.0 g SDS (fac L); 20 g of borax (25O wt.%) And 20.0 g of boric acid (2 5.0) are dissolved in 950 g of river water () with a density of p-IjOO, Phase bearing of the pelvis border with oil Vtohskogo field. Shkhasta Yu with a reservoir temp-urah equal to 95 C; less kK / m, as at the strenuous method, oil droplets are formed and detached by self-temperature.

The resulting composition is used to displace oil from the U | The displacement is carried out at a plastic temperature of 95 ± 1 C, first with one feather volume of river water, then with one pore volume of river water, then with one pore volume of the composition under study and again with river water. The increase in the coefficients of oil production is given in the table.

EXAMPLE 4 Analogously to Example 3, a composition is prepared containing 0.4 wt.% OP-10, 0.1, wt.% SDS, 1.0 wt.% Borax, 1.0 wt.% Boric acids, 97.5 wt.% of river water, for which in 975 g of river water with a density of j3 1.00, 4.0 g of On-l6, 1.0 g of SDS, 10.0 g of borax and 10 are dissolved by heating, 0 g of boric acid, Nejfaenoe tension of the composition at the boundary with the oil field, reservoir Yu, at 95 C less than 0.1 mN / m (example 3). The cloud point of composition 964; 1 C. The resulting composition is used for oil displacement, carried out analogously to example 3. The increase in oil displacement coefficients is given in the table.

EXAMPLE 5 Analogously to Example 3, a composition is prepared containing 0.2 wt.% OP-10, 0.05 wt.% SDS, 1.0 wt.% Borax, 1.0 wt.% Boric acid and 97.75% by weight of river water. The interfacial tension of the composition at the boundary with the oil of the Vakhsky field of reservoir 0, at a reservoir temperature of 95 ° С is 0.5 mn / ::. The cloud point of the composition is 96 ± 1 C. The increase in oil-displacement coefficients, carried out analogously to example 3, is given in the table.

PRI me R 6. Take 6.7 g of OP-10. (0.67 wt.%), 3.3 g of volgonate (0.33 vol.%), 20.0 g of borax (2.0 wt.%) 20.0 g of boric acid: (2.0 wt.% ) and dissolved with stirring in 950.0 g (95.0 wt.%) of river water (river Tom) with a density of p 1.00. The interfacial tension of the composition on the boundary with the oil of the Vakhskoye field of the Yu formation, at 95 ° C, is 1.1 mN / m. The cloud point of composition 99 + 1 ° C. Oil displacement is carried out first with the pore volume of river water, then with one pore volume of the composition, two pore volumes of water, then the second pore volume of the composition

S434

and water again. The increase in oil displacement ratios is given in the table. Example 7. Analogously to example 6. 3.4 g OP-10 (0.34 wt.%), 1.6 g of volgonate (0.16 wt.%), 10.0 g of borax (1.0 wt.%) and 10 g of boric acid (1.0 wt.%) is dissolved in 975.0 g (97.5 wt.%) of river water with a density of p 1.00. The interfacial tension of the composition obtained at the boundary with the oil of the Vakhskoye field, reservoir K ,, at is 1.1 mN / m. Cloud point. The increase in the coefficients of oil displacement, carried out analogously to example 6, is real (n in the table.

EXAMPLE 8 Analogously to Example 6, a solution is prepared containing 1.3 g of OP-10 (0.13% by weight), 0.7 g of volgonate (0.07% by weight), 10.0 g borax (1.0 wt.%), 10.0 g of boric acid (1.0 wt.%) in 978.0 g (97.8 wt.%) of river water with a density of p «I, 00. Interfacial tension composition on

with the oil of the Vakhskoye field

reservoir 10, at 95 ° С is equal to 1.6 mN / m. Cloud temperature of the composition is 99 + 1 C. The resulting composition was used for oil oil pressure condensation. Pr /} increase the oil displacement factors in the table.

PRI me R 9. Similarly to the example

6 the solution is prepared, containing; "A1Dium O ,, g OP-10 (0.07 wt,%), 0.3 g of volgonate

(0.03 wt.%), 10.0 g of borax (1.0 wt. X) 10.0 g of boric acid (1.0 May. /) In 979.0 g (97.9 wt.%) Of the river water with a density of about 1.00. Interfacial tension of the composition at the boundary with

Hetjitbio of the Vakhskoye field, formation 10j5 at 95 ° С is equal to 2.9 mN / m. Cloud point of composition, Increase of oil displacement coefficients, carried out as indicated in

measure 6, in the table.

Example 10 (by a known method). Take 4.0 g of OP-10 to be fused, with stirring, with 1.0 g of sodium dide cisulfosuccinate (SDS) at

temperature of 60-80 ° C and the resulting alloy is dissolved in Samotlor formation water with a density of about 1.025 (see example 1). Get a composition containing 0.4 wt.% OP-iO;

0.1 wt.% SDS and 99.5 May L of Samotlor formation water. The interfacial tension of the composition at the border with the oil of the Samotlor field at 70 C is 0.2 mN / m, the cloud point of the composition is 95 ± t ° C. The increase in the coefficients of oil-injection J, carried out analogously to example I, is given in the table below, Example 11. 6.7 g of OP-10 (0.67 wt.%) And 3.3 g of volgonate (0.33 wt.%) And pacTBopnrat are mixed with mixing 990.0 g (99.0 wt.%) of the river water (p. Tom) with a density of p "1.00. The interfacial tension of the composition at the reservoir with oil from the Vakhskoye field, the Yu formation is equal to 0.3 mN / m. The cloud point is equal. Increase of coefficients The increment of the coefficient of proposed oil pressure displacement conditions I2 43, carried out in analogy with example 3, is shown in the table. Thus, the proposed composition provides an increase in the oil displacement ratio by 5-30% compared with the known. The composition is stable in time (if it is left standing for a year, its properties did not disappear), which is important when carrying out the oil displacement process under industrial conditions. The composition provides enhanced oil recovery at high reservoir temperatures, and its oil production capacity increases with increasing temperature. in oil displacement and prototype in fti

1.OP-Yu LTO

Borax

Borna acid

Plastova water

2.OP-} 0

den

Borax

Borna acid

Plastova water

3.OP-Ш SDS

Borax

1 22.4

46.6

46,8

27.2

55.4

27.5

. OP-U0 4

SDS0,1

Drill1.0 $ 5

Boric acidI 0

Rechna water 97.5.

, OP-100.2

DSN0.05

fiypa1.0 95

Bourne khcnork 0

Rechna Voda97.75

6.OP-100.67 VolgonatO 33

Bura2.0 95

 . ..

Bourne sour gd2 0. River water. E5,0

7.OP-10 0.34 Volgonat: 0.16

Bura1,0 95

Borna acid1,0 River water. ; 97.5

8.OP-100,13 18olgonat0,07

Bura1,0 95

Borna acid1,0

Rechna Voda97,8

9.OP-100,07 Volgonat0,03

one

43.0

1 17.6

39.9

22.4

18.7 39,

23.3

26.8 46,9

13.5 32.2

boric acid

River water

lO.llsBecTHbtft

OP-10

SDS

Plastova water

11.0Y-10

Volgonat

River water

13.8 30.3

10.0 25.8