SU1555465A1 - Plugging mortar for low-temperature wells - Google Patents

Abstract

The invention relates to cement slurries and can be used in cementing oil and gas wells in the temperature range from minus 10 to 20 ° C. The goal is to reduce the period between the beginning and the end of the setting of the cement slurry, increase the strength of the cement stone in the temperature range from minus 10 to 20 ° C. The cement slurry as a binder contains finely divided non-gypsum portland cement clinker, as a complex additive nitrilotrimethylphosphonic acid or 1-hydroxyethylidene diphosphonic acid and potash or soda ash in a ratio (1: 114.35) - (1: 21.95), and also water. additionally exfoliated vermiculite in the following ratio of components, wt.%: finely ground non-gypsum portland cement clinker 64.06 - 70.40

expanded vermiculite 1,406 - 3,203

complex addition of nitrilotrimethylphosphonic acid or 1-hydroxyethylidene diphosphonic acid and potash or soda ash 1,434 - 3,267

water the rest. 2 tab.

Description

one

(21) 4314537 / 23-03

(22) 10/12/87

(46) 04/07/90. Bksh. № 13

(71) Production Association Arktikmorneftegazrazvedka

(72) V.I. Urmancheev, OL.Ostrovsky, V.P.Ovchinnikov, A.A. Klyusov and M.A.Sa. Nikitsky

(53) 622.245 „42 (088.8)

(56) Shlykova L.G. et al. Physicochemical principles of the use of cement slurries on non-gypsum portland cement. - In Proc .: Abstracts of the 6th Republican Conference on Physical and Chemistry. technologies for the production and application of washing liquids, disperse systems and cement slurries. - Ivano-Frankivsk, 1985, Part 2, p. 92-93.

Author's certificate of the USSR 1462871, cl. E 21 V 33/138, 1986 „

one

(54) FLUID SOLUTION FOR LOW-TEMPERATURE WELLS

(57) The invention relates to cement slurries and can be used

when cementing oil and gas wells in the temperature range from –Y to. The goal is to reduce the period between the beginning and the end of the setting of the cement slurry, increase the strength of the cement stone in the temperature range from -10 to 20 ° C. The cement slurry as a binder contains finely divided non-gypsum portland cement clinker, as a complex additive nitrilotrimethylphosphonic acid or 1-hydroxyethylidene diphosphonic acid and potash or soda ash in a ratio (It 114.35) - (1: 21.95) and also additionally exfoliated vermiculite in the following ratio of components, wt.%: finely ground non-gypsum portland cement clinker 64.06-70.40; expanded vermiculite 1,406-3,203; complex addition of nitrilotrimethylphosphonic acid or 1-hydroxyethyl lidene-phosphonic acid and potash or soda ash 1,434–3,267; water - the rest. 2 tab.

ate

ate ate ate

4b

СЬ

cl

The invention relates to cement slurries and can be used in cementing oil and gas wells in the temperature range from -10.

 The purpose of the invention is to reduce the period between the beginning and the end of the setting of the cement slurry and increase the strength of the cement stone in the temperature range from minus 10 to 20 ° C.

The cement slurry for low-temperature wells contains a finely divided, pinless portland cement clinker as a binder, and as a complex additive, a mixture of nitrilemethylphosphonic acid or 1-hydroxyethylidene diphosphonic acid and potassium carbonate (potash) or sodium (calcined soda) or potassium carbonate (potassium hydroxide (soda) and potassium carbonate (potash) or sodium (calcined soda) or potassium carbonate (potash) or sodium (calcined soda) or potassium carbonate (potash) or sodium (calcined soda) or potassium carbonate (potash) or sodium carbonate (potassium carbonate). - (1: 21.95), and

64.06-70.40 1.406-3.203

1,434-3,267 Else

also water and additionally exfoliated vermiculite in the following ratio of components, wt.%: Finely divided, gypsum-free portland cement clinker. Expanded vermiculite

Complex additive - a mixture of nitrilotrimethylphosphonic acid or 1-hydroxyethylidene diphosphonic acid and potash or soda ash Water

A finely ground, non-gypsum portland cement clinker with a specific surface of 240 m / kg and the following mineralogical composition,%, is used as a ghost: CjS 58; C2S 22; C3A 6.5; 12.5%. When grinding portland cement clinker, modified technical lignosulfonate was added in an amount of up to 0.2% by weight of cement.

The preparation of the cement slurry is carried out as follows: finely divided non-gypsum portland cement clinker is closed with aqueous pulp of exfoliated vermiculite with complex addition of plasticizer and electrolyte. After preparation, setting times are determined, and the forms with a cement solution are maintained at temperatures of -3, -10, and + 20 ° C. The time of cementing of cement slurries was determined at temperatures of -3 and 20 ° C. The compositions and properties of the investigated cement slurries are shown in the scoreboard 1 and 2.

Example (composition 8, table. 1). Take 3314 g of finely ground Portland cement clinker, 117.3 g of expanded vermiculite and mix. Then, 1.4 g and 161.5 g of potash are dissolved in 1405 ml of water. After this0

five

0

five

0

five

0

five

A mixture of finely divided Portland cement clinker and exfoliated vermiculite is closed with a solution of the complex additive and mixed.

As can be seen from the tables, the developed cement slurry, in comparison with the known, has optimum setting time, and cement stone - with increased strength values.

Claims (1)

Invention Formula Cement slurry for low-temperature wells, comprising stagnant, water and complex additives, in order to shorten the period between the beginning and the end of the setting of the cement slurry, increase the strength of the cement stone in the temperature range from -10 to, it additionally contains exfoliated vermiculite, it contains fine-grained, gypsum-free portland-cement clinker as a recipient and, as a complex additive, a mixture of nitrilotrimethylphosphonic acid or 1-hydroxyethylidene diphosphonic acid sodium carbonate or potassium with the following ratio of ingredients, wt.%: Fine groundless Portland cement clinker 64.06-70.40 Expanded vermiculite1, 406-3,203 A mixture of nitrilotrimethylphosphonic acid or 1-hydroxyethylidenediphosphonic acid with sodium carbonate or kali Water at the same time in the complex additive on 1 ma.ch. nitrilotrimethylphosphonic acid or 1-hydroxyethylidene diphosphonic acid contains 21.95-114.85 wt.h. sodium carbonate or potassium. 1,434-3,287 Else Ul ul ln Och ln