SU1046478A1 - Plugging mix - Google Patents

Abstract

1. SPRAYING SOLUTION containing portland cement, burned rock, additive and water, about t l. In order to increase the heat resistance of the cement stone by reducing the water separation rate, increasing the setting time of the cement slurry and strength and reducing the permeability of the cement stone in the temperature range of 20-300 seconds, it contains a complex additive melamine-formaldehyde resin MFAS-R100P and lignosulfonate or furfural and calcium lignosulfonate, or boric acid and sodium bichromate (potassium) in the following ratio of components, wt.h .; .Portlandcement 10-90. Burned breed:. 10-90 Melamine-formaldehyde resin complex additive MFAS-R100P and lignosulfo nata or (L furfural and lipodol sulfonate calcium, or boric acid and sodium dichromate (potassium) 0.3-4.0 Water 50-70 2. POP solution .1, differing from the fact that the components of the complex additive are taken s by a ratio of 1: 1. Ii (00

Description

The invention relates to the oil and gas industry, in in particular, cement slurries for cementing casing strings in deep and high temperature wells.

j A cement slurry consisting of Portland cement with the addition of high purity calcium aluminate is known [1].

The disadvantage of this grouting composition is the scarcity of components (for example, high frequency calcium aluminate .. calcium), as well as the high cost of chemicals.

The closest to the invention in technical essence is a cement slurry containing Portland cement, burned rock, sodium hexalitafbsfate and water [2 J, A disadvantage of the well-known cement slurry is that the introduction of a large amount of water and sodium hexalitaphosphate reduces the strength of the stone, increases its gas permeability in hydrobarothermal conditions.

In addition, the och.yen solution quickly thickens, which does not allow delivering it to the specified interval of the well. .

At the same time, an increase in deep drilling volumes and a variety of geological conditions in the country's oil and gas areas require the use of heat-resistant grouting materials.

The aim of the invention is to increase the heat resistance of cement stone by reducing the coefficient of water separation, increasing the setting time of the mortar and strength and reducing the permeability of cement stone in the temperature range of 20300 ° C.

The goal is achieved in that the grouting solution containing Portland cement, burned rock, additive and water., As an additive contains a complex additive of melamine formaldehyde resin MFAS-P1000P and lignosulfonate or furfural and calcium lignosulfonate, or boric acid and potassium sodium bichromane in the following ratio components, parts by weight

and lignosulfone, that or furfural and calcium lignosulfanate, or boric acid and sodium dichromate (potassium. U Water

0.3-4.0.

„50-70

Portland cement Burned rock Complex additive melamine • formaldehyde resin MFAS-R100P • 10-90

10-90

VNIIIPI

Moreover, the components of the complex additives are taken in a 1: 1 ratio. All solution components are common products. The burned rocks of Donbass used in the research are the product of self-firing of empty rocks in the heaps of coal mines and have the following composition,%: SiO, 55.30-61.80; A1 _g 0, 12.00-26.45; Fe ₂ 0 ₃ 8.00-13.00; CaO 1.11-9.00; MgO 1.90-3.00; SO, 0.45-1.40; K, O 1.96-4.04; NcuO 0.45-1.35, η g, b 0.70-6.0.2,

The proposed and well-known grouting solutions are tested in laboratory conditions. Preparation was carried out as follows. For 100 g of the dry mixture, 10-90 g of cement Portland cement and 1090 g of burnt rock were taken. The prepared mixture was closed with tap water at the rate of 50-70 ml (W / C = 0.5 and 0.7, into which 0.5 4.0 ml (g) of one of the indicated complex additives was introduced.

Samples were mixed for: 5 min, and then divided into two parts. One part was taken to test the technological parameters of the solution (mobility, water loss, sedimentation stability, pumpability, and the other was placed in autoclaves to measure physical and chemical parameters of the stone (strength, gas permeability, shrinkage).

Check the effectiveness of the proposed cement slurry and the known is carried out at 20-300 ° C and pressures of TO-15 MPa. '

Compared with the known, the proposed cement slurry has a low water separation (.0-4%), adjustable thickening times, high strength (10-35 MPa), and practically zero permeability.

In addition, the use of the proposed grouting mortar is economically feasible, since it allows the disposal of large tonnage waste polluting the environment and eliminates the acute shortage of heat-resistant grouting cements.

Order 7691/34

Circulation 603 Subscription

Branch of PPP Patent, Uzhgorod, Project 4,

G r

Claims (2)

1. A grouting mortar containing Portland cement, burned rock, an additive and water, characterized in that, in order to increase the heat resistance of cement stone by reducing the coefficient of water separation, increase the setting time of cement slurry and strength and reduce the permeability of cement stone in the temperature range of 20-300 C It contains, as an additive, a complex additive of melamine formaldehyde resin MFAS-R100P and lignosulfonate or furfural and calcium lignosulfonate, or boric acid and sodium dichromate (potassium) in the following ratio, wt.h .: Portland. . cop 10-90. Burned Rock 10-90 Complex additive of melamine formaldehyde resin MFAS-R100P and. _f lignosulfonate or furfural and ligno sulphon a- that calcium, or boric acid and dichromate nat ria (potassium) 0.3-4.0 Water 50-70 2. The solution according to π. 1, with the fact that the components of the complex additives are taken in a ratio of 1: 1. SU „„ 1046478