SU874979A1 - Cementing composition - Google Patents

Description

(54) MIXTURE STAWS

The invention relates to the production of plugging mixtures used in the drilling of wells during geological exploration, oil and gas exploration, engineering survey, drilling and blasting, etc. works, in particular the elimination of zones of complications associated with the absorption of flushing fluid and the collapse of rocks that form the borehole walls, as well as for the elimination of cut holes, and can be used in the oil and gas industry, geology and mining. Known cement mixtures are intended to combat the complications: absorption of washing liquid, landslides, etc., which contain mineral and ferromagnetic additives — various dispersed materials, such as iron powder, treated during the process of mixing with various magnetic fields. However, such mixtures are unstable: they have low plugging properties. The most similar in composition and technical essence to the invention of GOL51ETs is a cement mix containing mineral rods and a ferromagnetic additive (metal rods, pieces of wire, chips, etc.) processed by the electromagnetic field in the process of mixing. This mixture is also not stable enough and has low plugging properties, especially in mustache. catching low reservoir temperagur. The purpose of the invention is to increase the stability of properties. The goal is achieved by using a magnetic field-treated mixture containing the miggeral as a base — alumina cement and semi-aquatic gypsum, and a ferromagnetic additive — magnetized powder of barium hexaferrite,% by weight: Cement Remaining In order to maintain the high activity of this mixture during long-term storage, silcagel is introduced into it in an amount of 5-15% by weight of the mineral binder. An example: M-50O high-alumina cement M-50O mixtures of the Pashy cement plant and semi-water gypsum were prepared there, to which fine ground barium ferrite powder, previously magnetized with a magnetic field of 800 kA / m, was added with thorough mixing in amounts of 0, O1; 0.1; 1, O; and 3.0 weight. % of the weight of gypsum cement in shoushgr with a cement content of 49.99; 49.9;, 49, O; Ti 47.0%, respectively. The terms of skhvshan and the strength of the mixtures under uniaxial compression are given in table. 1. The adhesion strength of the cement stone under stretching, determined by the known method, is given in Table 2. 2

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25 20 75 75 70 18O Changes in the properties of the tamponing mixture during storage under conditions of the Far North are given in Table. I. As can be seen from the table. 1-3, the use of silica gel in an amount of more than 15% is impractical because of the loss of strength. The use of a plugging mixture allows: a) to increase the speed of strength at an early age; b) increase the hardening rate of the mixture; c) increase the adhesion strength of cement stone with rocks. Production tests have shown the reliability and effectiveness of the use of the mixture in the elimination of absorption and the strengthening of unstable rocks. At the same time, the waiting time for cement hardening is reduced by more than 1O times, the consumption of tamping material decreases, on average, by five to ten times, a high production culture and improved working conditions are achieved. When stored in field conditions in the regions of the Far North for two years, the mixture fully retains its stability, high activity and tamping properties. Table 1

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Claims (1)

 Invention Formula . 1, a tamping mixture, treated with a magnetic bottom, containing a mineral sticking and ferromagnetic additive as a base, characterized in that, with a chain of increasing the stability of the mixture and tamping properties, it contains alumina cement and semi-aquatic gypsum as the mineral mineral ferromagnetic additive - magnetized powder of barium hexaferrite, with the following content of components, weight. % Table 1OO 4O Semi-aquatic gypsum 40-60 Magnetized powder barium hexaferrite Oh, 01-3.0 Aluminous Center for up to 1OO cop 2, a mixture according to claim 1, characterized by the fact that, with a chain of preservation of activity during long-term storage, it will certainly contain silica gel in the range of 5–15% of the total mineral feed.