SU1481380A1 - Lightweight plugging composition - Google Patents

Abstract

The invention relates to the fastening of wells, in particular, to compositions of lightweight cement slurries for cementing wells under conditions of normal and moderate temperatures with low formation pressures. The purpose of the invention is to reduce the density of the cement slurry while simultaneously increasing the flexural strength of the cement stone based on it in the temperature range of 20-100 ° C. To do this, lightweight cement slurry containing Portland cement, electrostatic dust, water and an additive as the latter contains silicon production waste - silica dust / KP /, caught by scrubbers in the following ratio of components, wt.%: Portland cement 31-44

electrostatic dust 6-8

KP 9-13

water - the rest. Moreover, KP, captured by scrubbers, has the following chemical composition, wt.%: AL ₂ O ₃ 0.05-0.70

FE ₂ O ₃ 0.15-7.0

CAO 0.50-1.50

MGO 0.30-1.50

SO ₃ 0.10-1.50

NA ₂ O + K ₂ O 0.60-1.30

carbon in the form of graphite 1.50-10.00

SIO ₂ amorphous 50.0-70.00

SIO _{2 is} crystalline - the rest. The cement slurry with a density of 1370-1500 kg / m ³ forms a cement stone with a flexural strength of 0.9-4.5 MPa, which makes it possible to cement deep wells in one step. 1 tab.

Description

(21) 4255539 / 23-03

(22) 03.06,87

(46) 05.23.89. Yyul P 19

(71) Scientific part of the Siberian Research and Design Institute of the cement industry

(72) R.P.Ivanova, L.A. Vertoprakhova, T.Ya.Galperin, P.Ya.Zeltser

and V.I.Smola

(53) 622.245.42 (088.8)

(56) USSR Author's Certificate No. 835982, cl. From 04 to 7/14, 1981.

SNiP 1B2 - 69. (54) EASY LIGHT PLUG SOLUTION

(57) The invention relates to the fastening of wells, in particular, compositions of lightweight cement slurries for cementing wells at normal and moderate temperatures with low formation pressures. The purpose of the invention is to reduce the density of the cement slurry while simultaneously increasing the flexural strength of the cement stone at its center.

The invention relates to the fastening of wells, in particular, compositions of lightweight tempo- nal solutions for cementing wells under conditions of normal and moderate temperatures with low formation pressures.

The purpose of the invention is to reduce the density of the cement slurry while simultaneously increasing the flexural strength of the cement stone based on it in the temperature range of 20-100 ° C.

Cement slurry containing (Portland cement, electrostatic precipitator dust,

ve in the temperature range of 20-100 (1. For this, a lightweight cement slurry containing Portland cement, electrostatic dust, water, and an additive contains the silicon production waste — silicon dust (KP), collected by scrubbers in the following ratio, wt.%: Portland cement 31-44; dust electrostatic precipitators 6-8; KP 9-13; water-the rest; Moreover, the KP caught by scrubbers has the following chemical composition, wt.%: 0.05-0.70; Fe703 0.15-7, 0; CaO 0.50-1.50; MgO 0.30-1.50; SO, 0.10-1.50; Na70 + K20 0.60-1.30; carbon in the form of graphite 1.50-10 , 00; Si02 amorphous 50.0-70.00; SiO crista -crystal -. rest Oilwell solution density 1370-1500 kg / m3 form cement stone with a flexural strength of 0,9-4,5 MPa, which allows the cement in one step deep wells Table 1..

water and additive, as the last contain waste silicon silicon dust, captured by scrubbers with the following content of components, wt.%:

i

(/

four

00

oo

00

Portland cement Dust collectors

Silicon dust - silicon dust captured by scrubbers. Water

31-44

6-8

9-13 Else

31

The waste production of silicon has the following chemical composition, wt.%: 0.05-0.70 0.15-7.00 0.50-1.50 0.30-1.50 0.10-1.50

A1gOe

RegOe

Cao

MgO

S03

NajO +

+

Graphite carbon

0.60-1.30

1.50-10.00, SiO amorphous 50.00-70.00 Si02 crystalline Else A significant decrease in the density of the cement slurry of this composition and its ability to harden at 20-100 ° C is provided by the physical properties and features of the interaction of silicon production waste with the remaining components of the cement slurry.

The waste of silicon production - kreniya dust collected by scrubbers is a highly dispersed additive (3 4500-5000), containing in its composition these components with a large inner surface and chemical actinism, as well as a light material - carbon in the form of graphite, which will significantly reduce density of cement slurry (up to 1370 kg / m

 In the cement slurry of this composition, the alkalinity of the liquid phase is increased not only by hydration of Portland cement, but also by dissolving alkaline calcium oxides in it from electrostatic dust and from an additive. Due to this, the interaction of the components in the solution proceeds at the prevailing concentration of SiO in non-silica, which creates conditions for the accelerated formation of stable low-basic fibrous calcium hydrosilicate series CSH (B). The latter are highly dispersed, have a microcrystalline structure, and are characterized by much higher compressive strength and flexure than the highly basic hydrosilicates prevailing in bulk cement cement.

With increasing temperature, the solubility of silica increases, and this ensures curing is facilitated.

five

0

five

0

five

five

0

five

0

cement slurry in the temperature range of 20 - 100 ° C.

A lightweight cement slurry can be obtained by thoroughly mixing Portland cement, water and additives in the specified ratio, as well as by co-grinding Portland cement clinker, gypsum, electrostatic dust and silicon production waste.

 Example 1. In the laboratory, lightweight cement slurry is obtained by mixing the components.

For this, 440 g of portland cement, 60 g of electrostatic dust, and 90 g of silicon – silicon dust collected by scrubbers, after mixing, shut up 410 g of water and determine the properties of the mortar and cement based on it.

The results of physico-mechanical tests of lightweight cement slurry are presented in the table.

The results of the study show that the use of an additive in the form of silicon production waste in the composition of a lightweight cement slurry makes it possible to obtain lightweight cement slurries with a density of 1500-1370 kg / me, forming a cement stone with a flexural strength of 0.9-4.5 MPa against a known value 0.7 MPa.

The form of the invention

Lightweight cement slurry containing portland cement, dust from electrostatic precipitators, water and an additive, characterized in that, in order to reduce its density while simultaneously increasing the flexural strength of the cement stone based on it in the temperature range of 20-100 ° C, it contains waste as an additive the production of silicon - silicon dust captured by scrubbers, in the following ratio

Portland cement Dust from electrostatic precipitators Silicon dust - silicon dust captured by scrubbers. Water

Claims (1)

The invention is not only due to hydration of Portland cement, but also due to the dissolution in it of alkaline calcium oxides from dust of electrostatic precipitators and from additives. Due to this, the interaction of the components in the solution proceeds at a prevailing concentration of 45 silicon dioxide SiO ^ in it, which creates the conditions for the accelerated formation of stable low-base fibrous hydrosilicates. GSH (B) series calcium. Recent highly dispersive, 50 have a microcrystalline structure and are characterized by a much higher compressive strength and flexural strength, than the highly basic hydrosilicates prevailing in the member ¹ 55 tamponazh- prefecture cement. With increasing temperature, the solubility of silica increases, and this provides easier- hardening. Lightweight grouting mortar containing Portland cement, dust of electrostatic precipitators, water and additive, characterized in that, in order to reduce its density while increasing the flexural strength of cement stone based on it in the temperature range of 20100, ° C, it contains production waste as an additive silicon silicon dust trapped by scrubbers in the following ratio of components, wt.%: Portland cement 31-44 Dust, electrostatic precipitators 6-8 Waste from silicon production - silicon dust trapped by scrubbers Water 9-13 Rest 1 E * X φ 1 about e s about η I I about x about bi • e d About 1 " 1 1 'F 1 sh in in m m in m 1 X 1 1 x 1 CM tn about Τ- Τ- +1 1 g ΐ 1 o eleven 1 1 1 Ι Ι w 1 B 1 1 W 1 in Joint venture Joint venture <r m XX <R 1 1L Ltd about X 1 1 - cp <r m about About 1 P * eleven 1 1 1 1 ft 1 co 1 <t cm CM CM co R F * 1 " F | X YU Ε- 1 R X b X F >> 1 V— in r <r cn F about and X u ft U "1 * • t * * h "b ft ft about ft m F ΓΊ i CM co cn cn cm G R X R X X CM g I eleven eleven X —Ί-- I ¹ Λ- ^{5 1} X 1 I 1 about 1 X 1 F 1 CM 1 cd I X 1 + ι 1 X 1 about 1 CM 1 3 X 1 w 1 cm I  H X 1 1 II 1 cd 2 g