SU979619A1 - Plugging material - Google Patents

Description

(54) FLUSH MATERIAL

one

The invention relates to the mining industry, namely, oil and gas production and can be used in the cementing of oil and gas wells.

Known tampoic material representing portland cement with the addition of 5 coke 1.

This additive reduces its body weight, and the resulting cement stone has a relatively low strength.

The closest in technical essence to the achieved result is a tampon-cement material based on Portland cement and a facilitating additive, in which coal 2 is used.

However, coal doesn’t provide a sufficiently low density of the tamping solution due to the fact that water demand is practically not increased}, because of which the decrease in density is only due to the low density of coal. In addition, the use of materials of fuel resources to reduce the density of cement slurries is not economical.

The purpose of the invention is to reduce the density of the cement slurry and increase the strength of cement stone.

The goal is achieved by the fact that, as a facilitating additive, the cement slurry contains clay terriquics - coal mining waste during the next component (May.%

Portlaidzemate30-90

Clay slopsticks 10-70

Terrikonik are waste of coal and, depending on the seams in which the development takes place, are classified as clayey, carboate and creamy.

A characteristic feature of clay heaps is the increased alumina content (from 7 to 12%), for carbonate - a high content of carbonates (CaCO3 + MgCOi), which are in terms of CaO + MgO - from 20 to 45 ° / o.

Siliceous paving stones have a high silica content in the form of quartzite, marchalite, etc.

Glyous terrain animals contain the following kompoyeyty

The content of coal in terrain animals fluctuates over a wide range and depends on the type of coal, the method of its production, the conditions of the coal bed formation, etc.

The highest content of coal corresponds to the waste rocks from the extraction of brown coal, since taking into account the high ash content of these coal and relatively low calorie content, their use in the energy industry is less profitable than coal and anthracite.

The content of alumina will depend on what is part of the clay in the slag rocks.

The largest part of alumina is noted in the case when the clay part is represented by plastic high colloidal clays such as bentonite, for example, polygorskite (atapulgite). In this case, a high content of alumina predetermines an increased water demand, good sedimentation stability, and contributes to the improvement of other rheological parameters of the cement slurry.

The low content of alumina corresponds to the case when the clay part

it is represented by loess-like loam, argillites and other clay rocks with low water demand.

The clay part may be represented by ocher clays (underlaying, not rocks of the coal-bearing formation) and in this case the content of iron oxides is increased.

The sandy clay in the composition of clay wedges gives the latter a higher silica content, and the plastered clay - 5Oz.

A particularly large effect is obtained when the part containing clay in the waste rocks is represented by bentonite clays with the highest content of montmorillonite. The effect is less if the clay mineral is presented as beidellite and even less as kaolinite and halloysite.

The cement slurry was prepared by mixing Portland cement and clay slabs.

The results of studies of this cement slurry and its comparative data with the well-known cement slurry are shown in the table.

Claims (1)

Claim 1. Grouting material based on Portland cement and a lightweight additive, characterized in that, in order to reduce the density of the grouting mortar and increase the strength of the cement stone, it contains 35 clay terriconics — coal mining waste — as the lightening additive, in the following ratio of components (May.%) : Portland cement 30–90 Clay terriconics 10–70 ⁴⁰ 2. Grouting material according to π. 1, characterized in that the clay heaps contain the following components, May. %: C 20-50; SiO _x 18-26; A1 _L O, 7-12; Fe _x Oj 3-9; CaO GB — 28; MgO 2-4; SOj 1-4.