SU767152A1 - Composition based on oligoorganosiloxane and chlorosilane for insulating stratified waters in oil and gas wells - Google Patents

Description

Oligoorganoalkoxy (chlorine) silonsane 89-99.5 Chlorosilane 0.5-11 Oligoorganoalkoxy (chloro) silrxanes are obtained by an esterification reaction with an aliphatic alcohol () and subsequent hydrolysis or by co-esterification and hydrolysis of the corresponding jsyiOuSftst orgiochlorosilanes. Production of olyorganoal | soxy (chlorine) siloxanes. . P EXAMPLE 1 A three-necked: olbu equipped with a stirrer, 6b15atnym condenser and dropping funnel was charged with 30 g of trichlorosilane, 25 g of dimethylchlorosilane, methyldichlorosilane and 45 g of 102 g, 6 month consisting of YaiMotyltetrahlordisilana (45 wt.%) DiMethyl Trichlordisilane (5 wt.%) Omecrash (3 wt.%), Three Methyl-Trichlordisilmethylene (10 wt.%), Dimetr (5 wt.%), Methylethyldichlorosilane (b wt.%). To the resulting mass of p1H stirring at room temperature, 90.6 ml of absolute YAGOR of sodium alcohol is added over 2 hours, the reaction mixture is heated for 3.5 hours to a temperature in the bath. To the cooled noyu to a room temperature product with a titrated chlorine content of 19.98% is added in 0.5 h 10.5 ml of water. Then the reaction mass is aggravated and for 3 h, set up IfipH temperature in a 130 ° C bath. 145 g of oligomethyl & niltecs of CKSCrSsyLoxan are obtained with a content of C6 4.5 and ethogs of 40.4%. For example, 2.M.J.M., consisting of diethyltetrachlorodisilane (48% by weight), tetrachlorodisilane (2% by weight), ethylpentachlorodisilethylene (14% by weight), dystiltetrachlorodisil ethylene (10% by weight), texachlorodisylthylene, ethylacetylene disulfide ethylene (10% by weight), texachlorodistiltelethylene, ethylacetate, ethylenesilane. .%), diethyl dichloride lan (5 wt.%), triethylcorsilane (16 wt.%), with stirring and com. The mixture is added to the temperature range. 135 ml of absolute ethanol and 12 ml of yoda for 3 hours. Then the reaction mass is heated with a reverse cooling to temperature in a 130 ° C bath for 5 which switches the reflux cooler to the descending one and when heated to a bath, 96 ml of ethyl pyrol are distilled off . , hr - 116 g of oligoethylethoxychlorosiloxane are obtained with a content of 1.2% and ethoxy groups of 20.55%. Example 3. K75ml of a mixture of chlorosilanes containing 30% by weight of trichlorosilane, 25% by weight of dimethylchloromethane, 45% by weight of methyldichlorosilane, and 75 ml of a mixture consisting of diethyltetrachlorodisilane (48% by weight) ,. tetra

767152 hlordisilana (2 wt.%), EtilpentahLOrdisiletilena (14 wt.%), Dietiltotrahlordisiletilena (10 wt.%), Geksahlordisiletilena (5 wt.%), Diethyldichlorosilane (5 wt.%), Triethylchlorosilane (16 wt.%), With mix-; A mixture of 135 ml of isopropyl alcohol and 12 ml of water is added over 3 hours at room temperature. Then, the reaction mass is heated from THBSvj holOdilnik to a temperature in the bath of 130 ° C for 4 hours, after which the refrigerator is descending, and 50 ml of isopropyl alcohol is distilled off when heated to the bath. 126 g of oligomethyl ethylisopropyloxychlorosilbxane are obtained with a content of € 1.57% and iopropoxy groups of 30.0%. Example 4. A three-necked flask equipped with a stirrer, a reflux condenser and a dropping funnel was charged with 30 g of trichlorosilane, 25 g of dimethylchlorosilane, methyldichlorosilane, 45 g and 102 g of a mixture consisting ye dimetiltetrahlordisilana (45 wt.%), Yymotiletyltrihlordisilana (5 wt.% , tetramethyldichlorodisilane (3 wt.%), trimethyltriylchloride.isylmethylene (10 wt.%), dimethyltetrachlorodisylmethylamine (17 wt.%), dimethyldichlorosnlan (4 wt.%), ethyldichlorosilane (5%),), 3%),), 3%), ethyl acetate, 3% by weight, 4% by weight, 4% by weight, 4% by weight, 4% by weight, 4% by weight, 4% by weight, 4). ), methyltidyldichlorosilane (wt.%). To the resulting mass, under stirring and at room temperature, 99.5 ml of octyl alcohol are added over 2 hours, then the reaction mixture is heated to 3.5 hours in a bath. 57.1 ml of abs. Ethyl alcohol is added to the bh-cooled room temperature. 1.5 hr. Program a reaction mixture at 130 ° C in a bath for 3 hours. The product is cooled. 10.3 ml of water is added to the cooled product in 0.5 hours, the reaction mass is then heated and kept at for 3 hours. Obtain 210.8 g of oligomethylethyle dxyooctbichybie oxan with a Ci content of 0.5% and sskoxygroup 71.0%. Other oligomers with a different content of hydrolysable chlorine and alkoxy groups are obtained analogously. The isolates are prepared by mixing the obtained oligoorganoalkoxy (chlorine) siloxanes with chlorosilanes. The amount of oligoorganoalkoxy (chlorine) siloxane is taken such that the viscosity of the composition is 4-20 cP, which is necessary to ensure good permeability of the composition through the rock layer, and the amount of chlorosilane is such that the total amount of hydrolyzed chlorine in the Composition is 0.25-6, 0%, i.e. provided n-reliability when isolating formation waters.

Characteristics of the compositions are presented in table. one.

The resulting compositions, as well as the composition of the prototype, were tested on the installation, simulated rock formation conditions by the methods of the Ministry of Oil Industry.

The tests were carried out at a temperature of 20–200 ° C on low permeability cores taken from deep wells. Before testing, the cores were saturated with formation water.

The results of permeability tests are given in table. 2

From the table. 2 data shows that when processing cores with the proposed composition compared with the composition of the prototype, the degree of change in the permeability of cores is significantly higher (3-20 times).

The study of the solubility of polymers formed in the well during isolation (see Table 2) showed that the cross-linked polymer formed from the proposed composition is only slightly soluble in aromatic hydrocarbons (weight loss 0.85%), which ensures a high duration of the insulating effect The polymer forms a degradation of the prototype, the weight loss reaches 30%

Other formulations according to the invention have the meanings of the above parameters, similar to compounds 1-5.

The study of changes in the viscosity of the compositions in the process of gelation in

Characteristics of isolates of compounds

reservoir conditions showed that the proposed formulations retained the working viscosity for more than 2 hours, which allows the impregnation process of the water-saturated zone to be treated for a maximum g tubin, while composition 5 of the prototype loses its working viscosity after 0.5 hours.

The low viscosity of the composition according to the invention provides good filterability of the proposed composition in plastope conditions.

When testing the composition in oil-saturated cores with a water content of more than 10-15%, it was found that the composition of the invention does not affect the permeability of the core to oil due to the hydrophobization of the rock, which contributes to the isolation isolation.

Thus, the composition according to the invention has an increased time

0 insulating effect and significantly reduces the water permeability of the wells, which allows to limit the flow of formation water into the wells. The composition is applicable in a wide range of reservoir

S temperatures down to, which makes it possible to effectively regulate the development of deposits at great depths and increases the extraction of oil and gas from the depths. Due to this, the economic indicators of field development are improved: the cost of oil and gas is reduced, labor productivity increases.

Table 1

Source components

Oligomethylethyl ethoxy-chlorosiloxane 4.59 40.4 98.0

Oligoethylethoxychloro-siloxane 1.2 20.55 99.0

2.0

6.0

4.9

1.0

-, 3

1.8

Continued table. one

22

Claims (1)

220-370 - millidarcy. a prototype mixture of ci, a) dichloropole hlrrsilane in a mass ratio of 20 wt.%. Formula of the invention on the basis of oligoorganosilox and chlorosilane for isolating formation water in oil and gas wells, characterized in that, in order to increase the time of the insulating effect and reduce the water permeability of the wells, it contains oligoorganoalkoxy (chlorine) siloxane containing alkoxygroup number of carbon atoms in the group 2-8 2071 wt.% and chlorine to 4.6 wt.%, as chlorosilane - methyl (ethyl, phenyl) chlorosilane, methyl (ethyl) chlordisilane That b. persons 2 68 76 67 66 78 5.0 2.8 0.8 4.2 3.5 29.6 2.7 ethylsiloxane () and methyltri-g and 4: 1, containing chlorine in a mixture of (ethyl) chlorosylmethylene (ethylene). silicon tetrachloride, trichloro-ylan or their mixture with a total chlorine content of 0.25-6.0 wt.% and the following correlation of components, wt.%: Oligoorganoalkoxy (chlorine) siloxane 89-99.5 Chlorosilane 0.5-11 Information sources taken into account during the examination 1. Application No. 2666996 / 22-03, cl. C 08 L 83/04, 08.19.75, by which the decision to issue the author's certificate was made (prototype).