SU1321806A1 - Method of hydraulic isolation of formation in well - Google Patents

Abstract

The invention relates to the oil industry. The purpose of the invention is to increase the efficiency of waterproofing by improving the quality of the water insulating screen. A previously prepared mixture of hypana and poly-N, N-dimethyl-5,3-methylenepiperidinium chloride and sodium chloride is pumped into the formation from 5 to 7 May. % Then an aqueous solution of sodium chloride with a concentration of sodium chloride from 5 to 7 May is sequentially introduced into the formation. % in the amount of from 5 to 10% of the volume of the initial mixture and water in the amount of from 2 to 5 volumes from the initial mixture. The mixture is prepared by thoroughly mixing the components until a homogeneous state. In these times, the maximum value of the hydroisolation efficiency is 95% and is maintained when 25 pore volumes of water pass through the model. 3 tab. оо ю 00 о О5

Description

The invention relates to the oil refining industry, in particular to methods for hydroisolating an aquifer.

The aim of the invention is to increase the efficiency of waterproofing by improving the quality of the water insulating screen.

The method of hydroisolation of the formation in the well is carried out by sequential processing it with an aqueous solution of a mixture of hypane,

piperidinium chloride and water 1: 1.5: 12, respectively, for this purpose they take 13 ml of 17% hypan, 13 ml of a 25% polyM solution, N-dimethyl-5,3-methylenepiperidinium chloride and 6 ml of water. Additionally, 6% sodium chloride of the total mass of the mixture, which is 1.92 g, is introduced into the mixture of polymers and mixed thoroughly, and dissolved until complete dissolution. Prepare a 5% solution of sodium chloride in the amount of 10% of the obopoli-N, N-dimethyl-5,3-methylenepiperidinium. The volume of the mixture is 3.2 ml. chloride and sodium chloride 5-7%. Injection of reagents into the formation model with a derivative of sodium chloride solution in the amount of 5-10% of the volume of the initial mixture and water in the amount of 2-5 volumes of the volume of the initial mixture.

For the proposed method, it is recommended to introduce into the formation a mixture of aqueous solutions of polymers of hypane and poly-N, N-dimethyl-5,3-methylenepiperidium chloride in the amount of 2 m of mixture per 1 meter of insulated power.

water in the following sequence: first a mixture of polymers, then a solution of sodium chloride and water in a volume equal to 4 with two volumes of the injected mixture of polymers.

The quality of the waterproofing screen and the maximum efficiency of the waterproofing are determined with an oppositely applied layer with a ratio of hypane, poly-S, L-20 through the water model. In dimethyl-5,3-methylene-piperidinium chloride and under these conditions, the maximum value of water in a mixture of 1: (1.3-1.8) :( 10-13) passing through

Example. Isolation of a model of 25 pore volumes of water is carried out.

layer in the form of a cylinder with a length of 6 cm and pa-B table. 1 and 2 are dependencies.

1.5 cm in diameter. The pore volume of the model is 8.5 cm of the amount of pore water passing through. For such a model, it is necessary to use a treated reservoir model, while maintaining a 32 ml mixture of polymer solutions. Mixing (95%) of the quality of the insulating screen

polymer solutions are prepared with the ratio of the effectiveness of waterproofing from the method

Scientific research institute of hypana, poly-N, N-dimethyl-5,3-methylene-processing model.

Table 1

Perov water, volume / efficiency of hydroisolation,%, at concentration of aqueous solution of sodium chloride, wt.%

With the specified amount of NaCl, the mixture does not have water limiting properties (there is no waterproofing effect)

4 5 6 7 8 10

piperidinium chloride and water 1: 1.5: 12, respectively, for this purpose they take 13 ml of 17% hypan, 13 ml of a 25% polyM solution, N-dimethyl-5,3-methylenepiperidinium chloride and 6 ml of water. Additionally, 6% sodium chloride of the total mass of the mixture, which is 1.92 g, is introduced into the mixture of polymers and mixed thoroughly, and dissolved until complete dissolution. A 5% sodium chloride solution is prepared in an amount of 10% of the total volume of the mixture, which is 3.2 ml. The reagents are injected into the reservoir model in the following sequence: first, a mixture of polymers, then a solution of sodium chloride and water in a volume equal to two volumes of the injected mixture of polymers.

11/9510/958/95

20/9519/9518/95

22/9520/9519/95

20/9517/9517/95

17/9517/9517/95

16/9616/9516/95

Pore water, volume / efficiency of hydroisolation,%, at the concentration of aqueous solution of sodium chloride, wt.%

With the specified amount of Nad, the mixture does not have water limiting properties (there is no waterproofing effect)

The dependence of the efficiency of hydroisolation on the volume of water injected at the last stage of hydroisolation is given in Table. 3

Table 3

table 2

The amount of aqueous sodium chloride solution pumped is 5% of the volume of the initial mixture, and water - two volumes of the volume of the initial mixture (Table 1). The amount of aqueous sodium chloride solution pumped is 10% of the volume of the initial mixture, and water is two volumes of the volume of the initial mixture (Table 2). The content of sodium chloride in the polymer blend is 6 May. %, and in an aqueous solution of sodium chloride - 5 May. % (tab. 3).

Based on the data presented in Table. 1-3, it can be concluded that the method allows for the effective waterproofing of aquifers.

Claims (1)

Invention Formula The method of hydraulic isolation of the formation in the well by pumping a previously prepared mixture of hypane and poly-N, N-dimethyl-5,3-methylenepiperidinium chloride into the formation, characterized in that, in order to increase the effectiveness of waterproofing by improving the quality of the waterproofing screen, before injection Sodium chloride is injected into the formation in an amount from 5 to 7 May. %, and after injection of the mixture into the reservoir, an aqueous solution of sodium chloride with a concentration of sodium chloride from 5 to 7 May is successively introduced. %, in an amount of from 5 to 10% of the volume of the initial mixture and water in an amount of from 2 to 5 volumes of the initial mixture.