SU628289A1 - Plugging mix - Google Patents

Description

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The invention relates to pumping cement solutions; 1, drilling wells, in particular, under conditions of high pressure formations with a low pressure and a temperature not exceeding 8 ° C, and can be used in the oil and gas industry and mining;

Known grouting solutions of low density, including up to 5O% of lightening additives, such as tripoli, perlite, pemena, etc. fljj.

The disadvantages of the known solutions are low strength and high contraction, contributing to the water supply.

The closest to the invention is a cement slurry containing, in wt.%: 4O, 2 cements, 9, O clay and 5O, 8 water. Odraco application of this section for well cementing leads to the dehydration of the mudcake, the formation of fluid-conducting channels in the structure stone H in the zone of its contact with a mixing medium, which predominantly causes the occurrence of gas and water, is the annulus or cement screen.

The main physico-chemical cause for the occurrence of complications is the high contraction of the known cement slurry, which is particularly strong during the period of its setting and early hardening.

The purpose of the invention is to reduce the magnitude of the contraction of the cement slurry in the early stages of the day.

This is achieved by the fact that the composition npej of the lagged cement slurry containing cement, clay, and water is additionally introduced with the following: ratio of the components, wt. %:

Cement

4O, 2 - 4O, 9 1 „6- 2,6

Gpina

Gidrofobizirovanny

8.0 - 12.1 clicoptilolite Water 44.4 - 5O, 8

For the preparation of the cement composition, the cement of the Stitamak plant, the clay powder of the Konstantinovskiy plant and the hydrophobised wedge grain sifted through a SAR sieve (sieve residue 10.25%) are used. Gdrophobiace clinopilolite is obtained by the natural candidate of the Sokirnytskoe deposit of the Ukrainian Zakarpat field and polnatilgi Jcqeo siloxane GKZhg-94. The gishchel ofofohhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhvm_yuyuyu when grinding a mineral in a known manner, Syachala is mixed with a small amount of the mineral with a hydrophobiaator in a 1OO; 1, and then this mixture through the cell (© device) is fed to the bulk of the ground natural clinoptilolite, the Hydrophobiater forms a chemo-or- orea coating on the surface of the mineral particles, and its amount in the clinopti-Foliobiolith is about O, O1% by weight, about the weight, about the weight, about the weight, about the weight, about the weight, about the weight, about the weight, about the weight, about the weight, about the weight of OO1 The laboratory conditions of gigofophobiza h chsho and grinding of clinoptilolite are carried out in a ball mill of the brand 4L ML-A. In one grinding cycle, 1 kg of hydrochil fobiotic clinoptilolite is obtained. 999 g of natural clino-poulolite and 1 g of pre vagoto & a mixture of 1OO h, a natural wedge of poulolite and 1 part of a polyethylene / fosilksan. The grouting solution is prepared in a laboratory mixer with stirring for 3 minutes at a speed of 2 V / min. The compositions of cement slurries are set in tab. 1. The rheological properties of gfeived in table. 1 cement solutions are presented in the table. 2. In table. 3 given the contraction and bending strength of cement stone from cement slurries, are given in Table. 1. Ea table. 2 and 3, it is clear that the proposed tamping solution has a twice smaller amount of contraction in setting and early hardening, and, moreover, it differs in improved rheological and strength characteristics, with no less correspondence of the remaining properties of the solution to the requirements of lightened cement slurries (TU -.21-1-1-.67). The decrease in contraction during setting and early hardening is due to the pore space system of the wedge crystals. ptyololite and the features of spatial structures in this cadey depression. The 1phos pattern of 1 clinoptiolite steels consists of interconnected ultramicroscopic openings capable of absorbing and releasing water during the development of a vacuum inside the system (contraction process during cement hardening) without any change in volume and closure of the structure, which is oiv. is absent in schzugkh known silicate additives or g in. Hemispherz hydrophobic coating of the surface areas of clinolte-lolite crystals prevents, in a certain degree, the compacted restructuring of the hydration spatial structure of the cement slurry by creating positively charged clinoptilolite on the contacting surfaces, which is the same as the cement formations. Table 1

table 2

Table 3