SU1420137A1 - Plugging composition - Google Patents

Abstract

The invention relates to the extraction of oil and gas and m. used for repair and insulation works. The purpose of the invention is to increase the strength and water-insulating properties of cement stone. The solution contains the following components with their ratio, wt.%: Portland cement for cold wells 65.87-66.50; aminoethoxy alumina eros 0.17-0.45; water the rest. The solution is prepared by adding Aminoethoxyalumino-Aerosil to water and the resulting solution is closed with Portland cement. 2 tab.

Description

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with

: The invention relates to the field of oil and gas delivery and can be used for repair and insulation works to limit the flow of water into the well.

: The purpose of the invention is to increase the strength and water insulating properties of cement stone.

Aminoethoxy aluminoerosyl (AEAA) is a SiO oxides system modified with monoethanolamines aois, AEAA is a fine powder of Whole color.

I Example. The cement slurry is prepared as follows, i. The required amount of AEA is introduced into the water and the portland cement is closed with the resulting solution. Thus, for the preparation of 10 tons of solution, 6.7 tons of cement, 120 kg of AEAA and 2.3 m of water are required. ; Cooking techniques are as follows. : One of the cementing silos of the regatta is filled with 2.3 m of fresh water, gradually adding 20 kg of aerosil to it. 1 The unit is running in closed circulation mode. The mixing time at the second speed of the TsA-320 M unit (sleeve diameter 120 mm) is 15-20 minutes. The aerosil suspension obtained is fed into a cement mixing unit, for example, CM-4M, where, experimentally, the feed rate of cement and the aqueous suspension of aerosil are selected to obtain a cement slurry with B: C 0.5. The control parameter is the specific gravity and flowability of the resulting cement slurry.

The compositions and properties of the developed cement slurry are given in Table. 1. Water-insulating properties of cement slurries were also checked. Test

were performed under laboratory conditions on a linear model of a formation 7 cm long and 2.7 cm in diameter filled with quartz sand of a fraction of 0.01-0.2 mm, which allows simulating the injection of various fluids into the reservoir and continuously monitor their flow according to the scheme well-reservoir and reservoir-well.

Evaluation of the effectiveness of cement slurries is carried out by comparing plugging effects.

The blocking effect is determined by calculation using the formula:

15

G1 Ko. 100%,

where Ko and Ki are the permeability coefficients of the reservoir model before and after blockage, respectively. The test results are given in Table. 2

Claims (1)

Invention Formula Cement slurry, which includes portland cement for cold-Hnix wells as a base, an additive and water, characterized in that, in order to increase the strength and waterproof properties of the cement stone based on it, it contains as an additive aminoethoxy aluminoerosil in the following ratio of components, May . about/ Portland cement for cold wells 65,87-66,50 Aminoethoxy alumina aerosol 0.17-0.45 Water Else Table 1 66.66 AEA 33,34 34.25 0.66 33.4 33.4 21.5 8-30 9-20 3.3 ten 4-45 23.08-05 17,58-05 5-303, 2 8-554,6 8-554.9 AEAA offer 63.47 0.36 The famous 34.25 0.66 1.260.98 Pr edl amy Continued table. one table 2 0.39 60.0