SU1671841A1 - Plugging-back compound - Google Patents

Abstract

The invention relates to the drilling of oil and gas wells, in particular to cement mixtures for well drilling in difficult geological and technical conditions. The purpose of the invention is to increase the tamponing ability and suffusion resistance of the cement slurry, increase the strength and corrosion resistance of the cement stone in the temperature range from -10 to + 160 ° C. The grouting mixture contains, by weight.h .: alinite cement 100

dust of electrostatic precipitators of rotary kilns of the production of alynitic per 5-35

superplasticizer 0.3 - 1.6. The average particle diameter of dust is 5-8 microns. 2 tab.

Description

The invention relates to the drilling of oil and gas wells, in particular to plug-in mixtures for casing wells in difficult geological and technical conditions.

The purpose of the invention is to increase the tamping ability and suffusion resistance of the cement slurry, increase the strength and corrosion resistance at temperatures from -10 ° C to + 160 ° C,

The mixture is prepared as follows.

Alinite cement is used, containing, in wt.%: Alinite 55; Whites 30; chloraluminate 5; ferrite (alumoferrite) 5; other 5.

The specific surface area of alinite cement, as determined on a PSC-2 instrument, is 4032 cm2 / g. C content of 2.48%, MDO 2.18%, free calcium oxide is absent.

High alumina cement contains, wt.%:

Alinit.18

Belit15

Calcium chloraluminate - dicalcium ferrite 2 Calcium oxide free 2

The specific surface is 4248 cm2 / g. Alinite expanding tampon cement contains, in wt.%;

Alinit55

Belit20

Calcium chloraluminate 8

Dicalcium ferrite5

Other2

Content of free mix of calcium 10%. The fineness of the grinding is determined by sieving through a sieve with a mesh No. 008, through which 82% of the sieved sample passes.

For the preparation of cement slurries, electrostatic dust with a bulk weight of 1500 kg / m is used, the following mineralogical composition, wt.h .:

with

with

ON VI

00

19.1

17.5

2.0

5.9

Rest

Chemical composition, wt.

Aluminum oxide 2.5

Ferric oxide2.0

Calcium Oxide 31.0

Magnesium Oxide 2.0

Sodium chloride 19.1

Potassium Chloride 17.5

Calcium Chloride 2.0

Sulfuric anhydride3,5

Sodium ions 7.7

Potassium ions 13.9

Chlorine ions 27,7

Carbon Dioxide 11.52

Silicon oxide Else

The granulometric composition is characterized by the conditional average particle diameter of 5-8 microns. Superplasticizers C-3, 10-03, H-1 were used. For the preparation of cement slurry analogs, additives of vermiculite and mudstone with a density of 2300-2400 kg / m3 expanded to a bulk mass of 600 kg / m3 are used.

For the preparation of solutions of salts that were used as liquids and a corrosive environment, chemically pure reagents — calcium chloride and magnesium with a grade of analytical grade — are used.

PRI me R 1. Take 100 g of alinite cement grouting, 20 g of electric filter dust and 0.7 g of superplasticizer C-3, mix with joint grinding, and mix the mixture with 50 g of 4% magnesium chloride solution. After that, the technological properties of the cement slurry and cement stone based on it are examined. Materials to be tested at -10 and 0 ° C are pre-incubated at -10 and 0 ° C and the solution is prepared in a refrigerating chamber with a temperature of 0 ° C,

EXAMPLE 2. 100 g of alinite cement containing 2% free magnesium oxide, 5 g of electrostatic dust and 0.3 g of superplasticizer C-3 are taken, mixed, and then 35 g of industrial water are closed.

The compositions of cement slurries are presented in table 1.

Properties of cement slurry and cement stone are presented in Table 2.

Claims (1)

Claims of the inventive oil mixture for fastening oil and gas wells, including aluminic cement and facilitating the additive, characterized in that, in order to increase the plugging ability and suffusion resistance of the cement slurry, increase strength and corrosion resistance at temperatures from -10 to 160 ° C, it contains, as a facilitating additive, dust electrostatic precipitators of rotary kilns of the production of alynite in the binder and, additionally, a superplasticizer in the following ratio of components, m.ch .: Alinite cement100 Dust of electrostatic precipitators of rotary kilns of production of alynitic vzhuschego5-35 Superplasticizer6.3-1.6 b ln p 100 100 35 five 20 35 5 20 100 100 Swollen 10 vermijull t Vigorous and 10 argmllmt creator HLORK1- 53 I -, thief chloris- 50 that magni , 61 ra . , at 0, h Tehnichks I, 0 4g-us | 1 races tggs magnesium 1 Cv-3; 1.6 htorns-55 solution TOGO V LUTION H-1; G. - Tehchiche.-cl. B-; 0,9i-nP r chlorine - 50 TOGO Ch1GNNCH H-1; 61b-ny1 rzstv TOGO K.PY1IYa  Alkaline reagent solution  solution lotaia 52.3 , 16, 20 ,20 20 25 25 20 20 1, 10 1.15 1.15 1.20 1.20 1.15 1.20 1.15 17.7 21.0 18.4 22.3 2, 2 33.8 17.3 36.7 28, 0.88 0.94 0.90 0.89 0.91 0.83 0.80 0.92 0.89 1 0,8 5.1 5.5 6.0 , ", S .I 5.6 T "6Lip" 2 .Озз , 031 , 025 .Озз , 032, 026, 032 031 025 20 160 20 75 -ten 20 20 160 -ten 20 -ten 20 20 160 -ten 20 -ten 20 75 3-05 3-20 1.55 6-20 2-05 5-55 2-25 6-20 2-45 1-50 2-1 $ 6-4) 5 2-25 "-20 4-25 2.45 7-15 4-55 E-10 7-15 3-35 7-35 3-55 2-50 7-20 3-20 7-20 zo 1-20 1.15 1.25 4.5 7. 3.9 7.7 2.0 M, 8. J I. 4.0 1.5 4.7 5.1 8.6 1.45 4.3 I, 4 ".6 0.04 0.03 0.01 0.01 0.02 1.0 1.5 0.23 1.00 0.27 0.90 5.30 4, 1 2.36 1.22 2.48 5.95