The method of obtaining invert-emulsion solution

 

The method relates to the oil and gas industry, in particular hydrophobic emulsions used in the killing of wells before conducting underground repairs. The technical result is to increase the efficiency of the kill fluid of the wells by maintaining filtration-capacitive properties of the rock bottom zone, create favorable conditions for the inflow of formation fluid downhole during the development by reducing the rate of filtration and improve the electrical stability of the emulsion. In the production method of invert-emulsion solution, including pre-hydrophobization of asbestos, mixing it with a hydrocarbon liquid, an aqueous solution of salt is sodium chloride, potassium, calcium, surface-active agent surfactants, gidrofobizirovannym asbestos injected parts: the first half of it is introduced into a hydrocarbon liquid containing a surfactant, and then this mixture is mixed with a water solution of salt, and then enter the second half gidrofobizirovannogo asbestos in the following ratio, wt.h.: hydrocarbon liquid 40, the specified aqueous salt solution 60, repellent 0,3-2, surfactants 2-4, asbestos 1-5. And used as the water-repellent polymethylsiloxane in number, the as saw amaltal in the amount of 2-3, or as a repellent - imidazolin in the amount of 0.5-2, as well as surfactant - amaltal in the amount of 2-3, or as a repellent - imidazolin in the amount of 0.3-0.5, and as a surfactant - Smad-1 in the amount of 3-4. 4 C.p. f-crystals, 5 PL.

The invention relates to the oil and gas industry, in particular hydrophobic emulsions used in the killing of wells before conducting underground repairs. Increasing the efficiency of the kill fluid wells is achieved by maintaining the filtration characteristics of the rocks in the bottom zone, create favorable conditions for the inflow of formation fluid downhole during the development.

Known method of preparing the liquid plugging wells by mixing the hydrocarbon fluid (diesel fuel) with aqueous solutions of calcium chloride (CaCl2) or sodium chloride (NaCl) and two surfactants - multala and Smad-1 [1].

The disadvantage of thus prepared emulsion is a high rate of filtration, which reduces the permeability of rocks in the bottom zone of the well.

The closest is a method for invert emulsion comprising pre the affected quantities: diesel fuel and 20% solution l2in the ratio of 1:1, and the total amount of 4% of Smad-1 and 1% gidrofobizirovannogo asbestos [2].

The disadvantage of this emulsion is increased penetrating power into the reservoir, due to the high rate of filtration and low electrostimulation.

An object of the invention is to increase the efficiency of the kill fluid of the wells by maintaining filtration-capacitive properties of the rock bottom zone, create favorable conditions for the inflow of formation fluid downhole during the development by reducing the rate of filtration and improve the electrical stability of the emulsion.

This task is achieved by the fact that the proposed method of obtaining invert-emulsion solution (EEC), including pre-hydrophobization of asbestos, and then mixed with other components: hydrocarbon liquid, aqueous solution of salts, surface-active substances (SAS) Smad-1, according to the invention pre-gidrofobizirovannym asbestos introducing IER parts: the first half of it is introduced into a hydrocarbon liquid containing a surfactant, and then this mixture is mixed with a water solution of salt, and then enter the second half gidrofobizirovannogo asbestos, as hydrophob and: Hydrocarbon fluid 40 Aqueous solution of sodium chloride, potassium, calcium - 60 Repellent - 0,3-2 SAS - 2-4 Asbestos - 1-5 Comparative analysis of the prototype allows us to conclude that the claimed method differs from the known fact that pre-gidrofobizirovannym asbestos introducing IER parts: the first half of it is introduced into a hydrocarbon liquid containing a surfactant, and then this mixture is mixed with a water solution of salt, and then enter the second half gidrofobizirovannogo asbestos as a repellent offers new substance polymethylsiloxane PGCO-1001 and imidazolin, the ratio of the hydrocarbon liquid and the aqueous salt solution is taken 40:60.

Thus, the claimed technical solution meets the criteria of the invention of "novelty."

Analysis of the works of well-known researchers [2] have shown that they do not take into account the specific structure of asbestos, namely its debilnosti and high adsorption capacity. That is, asbestos is essentially Tverdovsky surface-active substance.

In theory of stabilization of emulsions significant place is given to solid fine fillers (solid surfactant). For invert-emulsion muds solid filler should play two opposite roles.

< three-dimensional structure in IER, giving it the necessary structural-mechanical and frictional properties.

Thus, part of the asbestos must be on the surface of the globules of water, and some in the amount of dispersion of hydrocarbon liquids.

Research scientists[2, 3, 4, 5], asbestos has a mosaic structure of the surface, i.e., on its surface there are active centers of various filenote having affinity to the hydrocarbon liquid and water, so the asbestos can actively absorb on the interfacial surface of invert-emulsion solution and to play the role of solid surfactant stabilizer. If the entire quantity of asbestos to enter into a hydrocarbon liquid containing a surfactant, in one step before mixing this mixture with a water solution of salt, it might happen that the bulk of it will be on the surface of the globules of water, the remaining part will not be enough to create the volume structure of the solution.

Our experiments proved that the best result on the stability of the solution and its structural properties are obtained if the pre-gidrofobizirovannym asbestos to enter into solution in parts: the first half to put first into a hydrocarbon liquid containing a surfactant, and then this mixture is mixed with water Rastko asbestos. Pre waterproofing asbestos propose to use such effective, new-repellent agents as polymethylsiloxane PGCO-1001 (TU-6-00-05763441-64-92) and imidazole (TU 2415-187-00203312-98).

With this method of obtaining IER gidrofobizirovannym asbestos when typing in a hydrocarbon liquid, which already contains a surfactant (Smad), immediately gets on the interfacial surface, creating a sort of hybrid protective shell globules of water. This also ensures the efficient use of other surfactants - Smad. Otherwise, if there are too many asbestos, trying to take seats on svezheubrannoy interfacial surface, Smad may be ejected in a hydrocarbon liquid.

The second half of the asbestos, we introduce into the solution when the interface is already formed, the surface forces are compensated "settled" Smada and the first half of the asbestos. Therefore, the newly added particles of asbestos can only be distributed in the volume of hydrocarbon liquid, forming a structural frame.

Summarizing the above, the proposed method of handling asbestos and enter it in the IER enables you to perform in a solution of two important functions: 1) wrapping globules of water in uglerodnoi fluid, improves viscosity structural-mechanical and clogging properties.

The foregoing leads to the conclusion that the claimed method of preparation of the EEC meets the criterion of "inventive step".

Serves 4 recipe IER, with different ratio of components (see table 1, 2, 3, 4).

As shown by experimental data, for composition 1 (table 1) are optimal content of Smad-1 in the amount of 3-4 weight parts, and PGCO-1001 - 1-2 weight parts (composition 2, 3, 6, 7, 10, 11). This table shows the composition of the emulsion: a hydrocarbon liquid (diesel or gas condensate) and a saturated solution of sodium chloride in the ratio of 40: 60, asbestos, Smad-1, PGCO-1001 in amounts shown in table 1.

For part 2, consisting of the following components: hydrocarbon liquid (diesel or gas condensate) and a saturated solution of sodium chloride in the ratio of 40:60, asbestos and 1.5 weight parts, amaltal and imidazolin in amounts specified in table 2, the optimal concentrations are the following weight ratios: amaltal - 2-3 weight parts, imidazolin - 0.5 to 2 weight parts (composition 2, 3, 6, 7, 9).

For part 3 (table 3), consisting of leogo sodium in the ratio of 40:60, asbestos is 1.5 weight parts, amaltal, PGCO-1001 in amounts shown in table 3, the optimal are the following relations: amaltal - 2-3 weight parts, PGCO-1001 - 1-2 weight parts (composition 3, 4, 5, 6).

For part 4 (table 4), consisting of the following components: hydrocarbon liquid (diesel or gas condensate) and a saturated solution of sodium chloride in the ratio of 40:60, asbestos and 1.5 weight parts, Smad-1 and imidazolin in quantities specified in the table, the most optimal is the following relationship: Smad-1 - 3-4 weight parts, imidazolin - 0.3 to 0.5 weight part (compounds 2, 3, 6, 7, 8).

All the compositions in tables 1, 2, 3, 4, prepared according to the claimed method: input asbestos in parts.

Table 5 presents comparative data structures 2 of the table.1 and 3 of table. 2, prepared with the input of asbestos in IER in parts, and the same compositions prepared with the input of asbestos in 1 reception.

Conclusion. As can be seen from table 5 (PP.1, 3), the preparation of the emulsion with the introduction of asbestos in parts allows you to get the IER with the desired parameters. Conversely, the input of asbestos in 1 reception leads to a sharp deterioration in the rate of filtration and electrical stability (table 5 PP.2, 4). This is obviously due to the fact that asbestos,selected protective layers on the surface of the globules of water, they easily blend in with each other, causing a high rate of filtration, low electrocapillary and generally low quality of the solution.

Thus, in table 5 the data implies that the claimed solution dramatically improves the quality of IER.

Sample preparation IER composition 1 in vitro.

You want to make 300 cm3IER density of 1.01 g/cm3. Expended for this purpose 102,5 cm3diesel, 180 cm3salt solution of sodium chloride density 1.06 g/cm3, 12 g of Smad-1 (11.5 ml), 4.5 g gidrofobizirovannogo asbestos, 6 ml PGCO-1001.

Technology of preparation of structure 1 with the introduction of asbestos in parts. Pre 4.5 g of asbestos mixed with 6 ml PGCO-1001 and leave for the day. After this time Smad-1 dissolved in the diesel fuel, which is then mixed with half the quantity gidrofobizirovannogo asbestos on the propeller type agitator Voronezh until complete dispersion. Then the above mixture is mixed with an aqueous salt solution (180 ml saline) for 10 min on a propeller stirrer. Then in the resulting emulsion, add the remaining 4.5 g gidrofobizirovannogo asbestos and mixed in the mixer for another 10 minutes. After carried out according to the following scheme. Per day the estimated quantity of asbestos is mixed with the calculated quantity of water-repellent. A day later half of this gidrofobizirovannogo asbestos is introduced into the container, where the hydrocarbon liquid (diesel or gas) containing the estimated number of Smad-1 or multala, and circulation through CA-320 all stirred until complete dissolution of the scheme capacity pump capacity. In other capacity is preparing an aqueous solution of sodium chloride (potassium, calcium). Using hydroactive mixing the above-mentioned hydrocarbon liquids containing surfactants and half the number gidrofobizirovannogo asbestos, and the aqueous salt solution. Then in the resulting emulsion is added the second half and spend circulation within 2.5 hours.

The sources of information.

1. G. A. Orlov, M. W. Candice, C. N. Glushchenko. Application of inverse emulsions in oil production. - M.: Nedra, 1991, page 62.

2. O. K., Angelopulo, C. M. Podgornov, C. E. Avakov. Drilling muds for complicated conditions. - M.: Nedra, 1988, page 71 (prototype).

3. So Century. Arkhipov, G. M. Kudrashova. The effect of some surfactants on the formation of the asbestos diaphragms. "Questions of applied chemistry, Saratov, 1987, pp. 26-29.

4. O. I. Grachev. Research so 35, 4, page 749-750.

5. Because bruzkus and other Influence of surface-active additives on the processes of coagulation structure formation in aqueous suspensions of asbestos. "Colloid journal", M, 1967, I. 29, 5, pp. 638-641.

Claims

1. The method of obtaining invert-emulsion solution, including pre-hydrophobization of asbestos, mixing it with a hydrocarbon liquid, an aqueous solution of salt is sodium chloride, potassium, calcium, surface-active substance, a surfactant, characterized in that gidrofobizirovannym asbestos injected parts: the first half of it is introduced into a hydrocarbon liquid containing a surfactant, and then this mixture is mixed with a water solution of salt, and then enter the second half gidrofobizirovannogo asbestos in the following ratio, wt.h.:
Hydrocarbon liquid - 40
Specified aqueous salt solution - 60
Repellent - 0,3-2
Surfactant - 2-4
Asbestos - 1-5
2. The method according to p. 1, characterized in that as a repellent use polymethylsiloxane in the amount of 1-2 weight.h., and as surfactant - Smad-1 in the amount of 3-4 weight.h.

3. The method according to p. 1, characterized in that as a repellent use polymethylsiloxane in as a repellent use imidazolin in the amount of 0.5-2 weight.h., and as surfactant - amaltal in the amount of 2-3 weight.h.

5. The method according to p. 1, characterized in that as a repellent use imidazolin in the amount of 0,3-0,5 weight.h., and as surfactant - Smad-1 in the amount of 3-4 weight.h.

 

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FIELD: oil and gas production.

SUBSTANCE: composition 61.0-68.9% petroleum or petroleum processing product, 2.0-4.7% natural fatty acid, 2.1-4.0% sodium hydroxide, and natural calcium carbonate with particle size 2 to 50 μm - the rest. Natural fatty acid employs vegetable and animal fat production waste.

EFFECT: enabled killing of well at temperatures up to 80°C with middle and low-permeable reservoirs using inexpensive and accessible domestically available materials allowing oil reservoir properties of producing formations to be preserved.

3 cl, 2 tbl, 2 ex

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