SU1422975A1 - Composition for enhancing oil yield of formations - Google Patents

Description

(46) 07.09.91. B1l P 33

(21) 4091703/03

(22) 07/14/86

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

(72) L.K.Altuiyina ,. V.A.Kuvshinov, with I.F.Efremov, L.A.Stasieva,

A.I. Vashurkin, A.S.Kasov li V.V. New cities

(53) 622.276 (088.8)

(56) USSR Author's Certificate 1259705, cl. E 21 B 43/22, 1984.. . USSR Author's Certificate 1228543, cl. E 21 V 83/22. 1984

(54) COMPOSITION FOR IMPROVING NEFTESTERS

I (57) The invention relates to oil production and may be used to enhance oil recovery in the development of oil fields using a surfactant.

, lisfib - increasing oil production

abilities of the composition in the seams with temperature spur, Composition includes non-hepatic. ilAB, ionic surfactant, ammonium nitrate, carbamide and mi eralnized hearth in the following ratio of components, Mat.%: tieHOiio- gene surfactant 0.13–6.40, noiohep surfactant 0.07–1.60, ammonium nitrate 1, 00-8.00, carbamide 1.00-8.00, mineralized water the rest. The composition of the pnggo is as follows: 6.0 t (5.0 wt.%) OP-10, 1.5 t- (1.0 wt.%) Volgonate, 7.5 t (5.0 wt.% ) ammonium nitrate, 7.5 tons (5.0) of carbamide and 126.2 m (127.5 tons) of saline water are placed in a container and they are mixed until the components are completely dissolved, and 150 tons of preparation are obtained. The composition is pumped into the injection well, pushed and the reservoir is pressed for 6-25 days and then the injection is continued. 1 tab.

"4 Yu GO

WITH

cl

The invention relates to the oil industry and can be used to enhance oil recovery in the development of oil fields using water flooding, with the use of surfactants.

The aim of the invention is to increase the oil-forced method of composition in formations with temperatures of more than 80 ° C. ,

The composition includes a non-ionic surface actin substance (surfactant) / ionogen surfactant, ammonium nitrate, urea, and saline water. J5 Nonionic surfactant ensures the working capacity of the composition under the conditions of differently mineralized formation waters. Ionogenic surfactant provides the composition with elevated, 20 reservoir temperatures. Ammonium nitrate and carbamide Buffer brush

on the performance of the composition at the temperature of the reservoir over temperature. . 25

The concentration of urea should be in the range of 1.0-8.0 wt.% (Optimally 1.0-5.0 May.%). An increase in the concentration above 5.0 wt.% Does not lead to an increase in the positive effect. The use of a composition with a concentration of urea greater than 3 wt.% Is not economically feasible.

-When urea concentration is less than 1.0% by mass, the positive effect is not achieved, since t- are obtained. formulations with low .pH values and reduced buffer capacity.

The total concentration of non-ionic OP-10 or Pregel NG-12 or AF-12 and ionic volgonate or sulfanol - surfactant, taken in a ratio from 2: 1 to. 4:., Should be s in the range of 0.2 to 9.0 wt.%, Preferably 0.5 to 2.0 wt.%. With a lower surfactant concentration, the positive effect is not achieved. An increase in the surfactant concentration above 1.0 wt.% Practically does not lead to an increase in the positive effect.

50

The concentration of ammonium nitrate is 1.0-8.0 wt.%. The positive effect for formulations with a concentration of 2.0-8.0 wt.% Is at the same level, while reducing the concentration below 1.0 wt.%, The positive effect is not achieved.

„

0

five

The composition provides popepenie oil, recoil when. reservoir temperatures svippe 80 ° C.

In order to ensure the operability of the composition and the optimal content of its components, the absolute and relative increase in the oil recovery ratio relative to waterflood compared to the known composition was determined. The results of experimental determination of the health of the composition are given in the table ™

tse ; about

From the analysis of the results it follows that the optimal content of the components in the composition is as follows:. Ionogenic surfactant 0,13-6,0 Ionogenic surfactant. 0.07-1.60 Ammonium Nitrate 1.00-8.00 Urea 1.0-8.00 Mineralized waterErest

An example of preparation of the composition in real conditions.

6.0 g (5.0 wt.%) OP-10, 1-, 5 t (1.0 wt.%) Volgonata, 7.5 tons (5j, 0 wt.%) Ammonium nitrate, 7.5 tons (3.0 wt.%) Carbate and 126.2 m (127.5 t) of saline water are labeled with ef-iKOCTb and mixed until the components are completely dissolved, 150 t composition is obtained. The composition is pumped into the injection well, pushed into the reservoir, held for 6-25 days, and then the injection of water is continued.

Claims (1)

Invention Formula Composition for enhanced oil recovery. Plasts; including non-ionic surface active substance (surfactant), ionic surfactant, alkaline {additive}, and saline water, characterized in that, in order to increase the refluxing capacity of the composition in the formations with a temperature above, the composition contains ammonia - liter and carbamide with the following ratio of components, wt,%: Nonionic surfactant 0,13-6,40 Ionogenic surfactant 0.07-1.60 Ammonia saltpeter. 1.00-8.00 Urea1,00-, 00 Mineralized Eoda, the Rest 6.7 8,250,7 1.3 41.6 9," 0.7 22.2 43.5 9.0 0.7 28.3 62.9 P55 9,050,7 26.3 50.0 7.358.2 0.3 7,8 17.2 Continue to table i Volgopat 0.33 6.75 9.8 0.4 29.1 53.3 8.3 0.4 28,8 58.2 6,6 8.25, 0.3 33.2 66.6 8.3 0.3 30.1 66.6 2.9 32.2 iti22975 Worp acid1 "0 Rcch vodo97,9 - According to the prototype OP-10. 0.67 Vrgonat 0.33 Vura2 0 Borna acid2,0 Manual water 95,0, Prototype Oil-IO0,8 SDS0,2 Drill .2.0 Rechna water 95.0 Borna acid2.0 The continuation of the table p. Relative prnrost KOE FITSN heat testing% 1.1 22.4 51.4 0.1 27.5 55.4