SU1728473A1 - Polymer plugging-back compound - Google Patents

Abstract

The essence of the invention: the composition contains (wt.%): Urea-formaldehyde resin 62-70, foaming resol phenol-formaldehyde resin brand FRV-1A-WATER solution of the primary products of alkaline condensation of phenol with formaldehyde, containing surfactant and aluminum powder 26-36; waste of maleic anhydride production from the stage of vacuum distillation of maleic anhydride 2-4. 2 tablets

Description

The invention relates to the technique of drilling wells, in particular, to compositions for the prevention of the elimination of geological complications: the fixation of fractured rocks prone to crumbling, the isolation of absorbing horizons and water inflows.

A cement grouting composition for fixing a well bottom-hole zone containing urea-formaldehyde is known. phenol-formaldehyde resin and an aqueous solution of hydrochloric acid. The disadvantage of this mixture is the low compressive strength of the cement stone, its fragility, and the solubility in water of hardener - hydrochloric acid. All these factors significantly reduce the efficiency of the cement works.

wells and water inflows in wells containing urea-formaldehyde resin, resol phenol-formaldehyde resin and an aqueous solution of ferric chloride as a hardener. in the following ratio, wt.%:

Urea formaldehyde resin40-50

Phenol formaldehyde resin40-55

Ferric chloride

(50% water

solution) 5-10,

The disadvantages of this composition are: embrittlement embrittlement, low adhesion (0.07 MPa), the presence of a water-soluble hardener — ferric chloride — in the composition, as well as a short loss time for the mixture (1.5 minutes). The aforementioned mixture is used according to the dry plugging method, which additionally provides for the presence of plastic containers into which the mixture must be packaged (separately resins and hardener). formed cement stone in the zone of complications due to poor adhesion of the composition to polyethylene.

The aim of the invention is to increase the efficiency of insulation works by improving the strength and adhesive characteristics of the cement stone, as well as an increase in the setting time of polymer mixtures based on urea-formaldehyde and phenol-formaldehyde resins.

This is achieved by the fact that the mixture additionally contains waste production of maleic anhydride (OMA) in the following ratio of components, wt.%: Urea-formaldehyde resin (KF-B) 62-70

The foaming resol phenol-formaldehyde resin grade FRV-1A is an aqueous solution of the primary products of alkaline condensation of phenol with formaldehyde, containing a surfactant and aluminum powder 26-36 Waste from the production of maleic anhydride from the stage of vacuum distillation of maleic anhydride 2-4 OMA is applied to the same 2–4 OMA-1 OMA –––––––––– maleic anhydride of continuous action from the stage of vacuum distillation of maleic anhydride, which cannot be used commercially at the present time is burned. OMA is a dark brown pasty mass with a melting point of 51-56 ° C. Density is 1290 kg / m. insoluble in water. OMA has a composition, wt.%: Maleic anhydride 35-53 Citraconic anhydride 2-4 Benzoic acid 1P - 15 o-Toluic acid 1 -2

Phthalic anhydride 23-35

Phalid 6-10

The formation of cement stone and its properties were studied in laboratory conditions close to the borehole. The studies were carried out at different temperature conditions in a medium of glistening and clayless washing liquids at different pH and concentrations of mineral salts.

In tab. 1 presents examples of the composition of the cement mixture Termetik-1 and the prototype.

At the indicated ratios of tampon, a mixture of Hermetic-1 and the prototype have the following characteristics (Table 2).

A decrease in the mass content of CF-B below 62% leads to an excessive increase in the setting time of the mixture with a simultaneous deterioration in the strength characteristics of the cement stone. With a mass content of CF-B of more than 70%, the setting time of the mixture and the strength of the cement stone decrease dramatically.

5 Similar dependencies are observed with decreasing and increasing the specified range of the content of the pdf-1A and oma. In this connection, in the application for the present invention, the above ranges of values of the mass ratios of the components of the cement mix Hermetic-1 are included.

The composition is prepared as follows. The tanks are stirred until the resin KF-B and FRV-1A are uniformly mixed, and then OMA is added in the calculated amount. The resulting mixture is thoroughly mixed and placed in a container for delivery to the complication zone. The countdown is made

0 since the introduction of OMA.

A comparative analysis with the prototype allows us to conclude that the proposed polymer cement composition is distinguished by improved strength characteristics of the cement stone, because it exhibits high plasticity for 2 months and does not become brittle as a prototype: high adhesion value, in the proposed mixture

0 it is 6 times higher than that of the prototype: elongated setting time, which allows for tamping work without special shells, pre-packaging of components in plastic

5 container, which significantly improves the quality of insulation works and reduces the time spent on their preparation and production: using OMA as part of the polymer mixture. highly active and insoluble in the inlet and rinsing

liquids Thus, the present invention meets the criterion of novelty. i

The analysis of the known inventions (analogues) in the studied area allows us to conclude that there are no signs in them that are similar to the existing distinctive features in the proposed polymer cement composition, and recognize the proposed invention to meet the criterion of significant differences.

The proposed polymer cement composition makes it possible to increase the efficiency of insulation works by improving the strength characteristics, adhesive properties of the cement mixture and increasing its setting time.

Claims (1)

Invention Formula Cement-based polymer composition, including urea-formaldehyde and resol phenol-formaldehyde resins, characterized in that. In order to improve the tamping properties of the composition by increasing the strength and adhesion properties of the resulting cement stone and increasing the setting time of the composition, it additionally contains industrial waste of maleic anhydride from the vacuum distillation of maleic anhydride, and as a rezol phenol-formaldehyde resin using a foam template. ФРВ1А - an aqueous solution of the primary products of alkaline condensation of phenol with formaldehyde, containing . Surfactant and aluminum powder, with the following ratio of components, wt%: 0 Urea-formaldehyde resin62-70 Foaming resole phenol-5 maldehyde resin brand FRV-1A is an aqueous solution of the primary alkaline condensation products of phenol with formaldehyde, containing a surfactant and aluminum powder 26-36 Production waste 5 maleic anhydride from the stage of vacuum distillation of maleic anhydride 2-4. 0 Table 1 table 2  The indicated parameters are measured by the authors of the present invention.