SU909126A1 - Plugging composition - Google Patents

Description

I

The invention relates to cement. wells, namely the formulation of cement slurries.

Portland cement based cementing solutions with additives of accelerating agents for intensifying the process of structure formation are widely known. Chemical agents are used as accelerators, for example, potash and caustic potash 13, calcium chloride, soda ash and metas 2.

Of the known cement slurries used in cementing casing strings, the composition of the ingredients is closest to the proposed cement slurry, which contains parts by weight: portland cement 100; water 65-75 and calcium chloride 5 6 3.

A disadvantage of the known tampon solutions is the significant dependence of the setting time on the concentration of chemical additives-quark, reducing the strength of the cement stone, in particular, on contact with the walls of wells and casing.

The purpose of the invention is to reduce the setting time and increase the contact strength of cement stone with the borehole walls and casing.

The goal is achieved by

40 that as an additive, the cement slurry contains catalyst waste K-5 in the production of isobutylene, with the following component ratios, parts by weight:

15

Portland cement 50-80 Catalyst K-5 20-50 Water 5-55

Catalyst K-5 is used in the production of isobutylene in the de-hydrogenation of isobutane. Catalyst use cycle days. After working off, the K-5 catalyst goes to the production waste, which is

are given as commodity products according to TU 38-303-05-7 rubber products plant.

The catalyst waste K-5 is a pulverized (fine) product of gray-green color. The product is non-explosive, non-flammable and non-toxic. By chemical composition, it includes D: Cr 0, 95 SiOn, 2. The fractional composition of the particles of 70 microns contains 902 ;.

In order to determine the optimal additive ingredients, several formulations of the proposed and well-known cement slurries are prepared and tested under laboratory conditions. Waste catalyst K-5 is added to portlan cement in a dry form and mixed thoroughly. Then the dry mixture is shuttered in water.

The table shows the test results of cement slurry and stone with the addition of K-5 catalyst waste and calcium chloride.

As can be seen from the table, the addition of catalyst waste K-5 helps to accelerate the pumping time, the beginning and the end of setting; the process of structure formation proceeds most efficiently with the addition of more than 10 parts by weight to portland cement. catalyst waste K-5. However, additives over 50 weight.h. leads to a decrease in the strength characteristics of the stone, ko4

Some are lower than allowable (15 kgf / cm for bending). At balances of 20-50 wt.h. catalyst waste K-5 to portland cement is observed

the greatest contact adhesion to metal and linear expansion. This contributes to the qualitative separation of the layers in the annulus. According to the research it is clear

which is optimal when using waste catalyst K-5 when cementing columns is up to 75 ° C, i.e. when cementing intermediate technical columns. For

The known tamping solution has a very slight change in the structural and mechanical properties and, at the same time, these solutions have sedimentation instability and high water content due to an increase in the water-cement ratio (see table, mixtures 6, 12 and 18).

Based on the research we can conclude that

use as an accelerator for the structure formation of K-5 catalyst waste in an amount of 2050 parts by weight. intensifies the process of structure formation, i.e. reduces the pumping time, the beginning and the end of the cement slurry setting, and improves the adhesion of the cement stone to rocks and casing metal.

79091268

Claims (3)

Formula of invention Portland cement 50-80 Cement slurry including torus K-520-50 Portland cement, water and additive, o t - Water + 5-55 It is a fact that, with s Sources of information, in order to reduce the setting time taken into account in the examination and increase the contact strength of the price- 1. USSR author's certificate coping stone with the walls of wells #, class. E 21 V 33/138, 1975. and by casing pipes, it contains 2. USSR author's certificate as an additive, catalyst waste Yu. 68 + 127, cl. E 21 V 33/138, 1971K-5 in the production of isobutylene at 3. USSR author's certificate the following components, 635221, cl. E 21 V 33/138, 1973 weight.h: (prototype). Catalysis Waste