SU860906A1 - Plugging composition - Google Patents

Description

The invention relates to the field of drilling, namely to cement slurries to eliminate the absorption of washing liquid. A grouting composition containing a cement mixture with primary setting accelerators 1 is known. A disadvantage of this composition is the low strength of the grouting stone. The closest in technical essence and the achieved result is a grouting composition containing cement, water and accelerator setting time 2. Its disadvantages are the low compressive strength of the cement stone in the early periods of hardening and long setting times. The aim of the invention is to increase the compressive strength of cement stone in the early periods of hardening while simultaneously reducing the setting time of the composition. This is achieved by providing the composition with a freshly prepared solution of silicic acid and caustic sodium or potassium, as an accelerator of setting time, and %: Cement 53-61; Water27-31 Silicic acid 4-10 Caustic sodium or potassium 4-10 This composition has the following characteristics: Density, 1.65 g / cm. Flowability along the cone of Aznia, cm 16-17 Start of setting, min 1.5-12 End of setting, min 19-26 Durability stone in compression, kgf / cm: after 1 h40-80 after 3 h100-130 after 24 h130-160 To prepare this tamponage mixture, several compositions were prepared as presented in the table. There, the composition of the composition includes a cement mortar (w / c 0.45) and a hardener. The latter is prepared as follows. Separately, sodium hydroxide (potassium) is dissolved in a portion of the water, then silicic acid. After complete dissolution, the mixture is added to the cement mortar. At the same time, 6-8% of water is needed to dissolve caustic soda (potassium) and silicic acid, based on the amount specified in the composition, for example: cement mortar (w / c 0.45) - 450 g of cement, 200 ml of water, and hardener - 7 ml of water, 40 g of sodium hydroxide, 40 g of silicic acid. The laboratory studies of the proposed composition of the 11 "1" show that the setting time of the cement block is reduced: the beginning of the setting is 1.5-12 minutes, the end of the setting is 19-26 minutes, and its degree of increase increases. The economic effect is 300-350 rubles per operation.

Formula and 3 optics

The cement composition, cement, water and accelerator setting time, characterized in that, in order to compress the strength of cement stone in the early periods of hardening, while simultaneously reducing the setting time of the composition, the composition contains freshly prepared mortar from silicic acid and sodium hydroxide or potassium, and the ratio of ingredients is the following, wt. %:

Cement53-61

Water27-31

Silicic acid 4-10

Caustic Sodium or Potassium4-10.

Sources of information taken into account by experts

1. Danyushevsky V.S.N. Dr. Reference Guide for Standard Materials. M., "Nedra, 1973, p. 130-144. 2- N. I. Tishkov et al. Isolation of absorbing horizons while drilling boreholes. M., 1960, p. 161.

Claims (1)

Claim A grouting composition containing cement, water and an accelerator of setting time, characterized in that, in order to increase the strength of the cement stone for compression • in the early stages of hardening while reducing the setting time of the composition, the composition contains a freshly prepared solution of silicic acid as an accelerator of setting time sodium hydroxide or potassium, and the ratio of ingredients is as follows, weight. %: Cement53–61 5 Water27—31 Silicic acid 4-10 Caustic Sodium or Potassium 4-10.