RU2235857C1 - Backfilling material - Google Patents

Abstract

FIELD: well construction technology.

SUBSTANCE: material includes Portland cement, expanding admixture, gypsum, hardening accelerator, plasticizer, as an expanding admixture has at least one admixture from group: alumina cement, sulphoaluminate cement, aluminate-containing slags from production of ferrotitane, ferroboron, secondary remelting of aluminum, as plasticizer having mixture of triethanolamine and silica-containing admixture of multifunctional effect at ratio from 1:1 to 1:10 and additionally has lightening admixture at following ratio of backfilling material components in percents of mass: expanding admixture - 2-15, gypsum - 7-9, hardening accelerator - 2-8, said plasticizer - 0.3-0.8, lightening admixture - 3-10, Portland cement - the rest. As hardening accelerator backfilling material may contain chloride salt of alkali or alkaline element. As lightening admixture alumosilicate microspheres or microsilica may be used, or expanded vermiculite, or expanded perlite.

EFFECT: higher sedimentation resistance, no water discharge, longer thickening time.

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Description

The invention relates to the construction of wells and can be used in the production of grouting materials for fastening oil, gas and other wells.

Various expanding cements are known, for example, gypsum-alumina cement obtained by co-grinding alumina slag and two-water gypsum in a ratio of 3: 1 (see Danyushevsky and others. Reference Guide for cementing materials M .: Nedra, 1973, p. 124-125).

The closest analogue to the invention is a grouting material for low temperature wells, including, wt.%: Portland cement - 48-80; expanding supplement - 20-50; antifrosty additive (hardening accelerator) - 4-6; plasticizer - 0.15-0.7% by weight of cement cement (see patent RU 2144977, IPC 7 E 21 B 33/138, publ. 01.27.2000, Bull. No. 3).

A disadvantage of the known binder is its rapid thickening and high sedimentation instability, which leads to delamination of the cement slurry, limiting the scope of cement due to the heterogeneity of the formed cement stone and gas manifestation between the casing and cement stone.

The objective of the invention is to improve sedimentation stability, slowing down the thickening of cement slurry.

The problem is solved in that the grouting material, including Portland cement, an expanding additive, gypsum, a hardening accelerator, a plasticizer, contains as an expanding additive at least one additive from the group of alumina cement, sulfoaluminate cement, aluminate-containing slag waste from the production of ferrotitanium, ferroboron, secondary remelting of aluminum, as a plasticizer a mixture of triethanolamine and a silica-containing additive of multifunctional action - KMX in a ratio of 1: 1 to 1:10 and an additional but contains a facilitating additive in the following ratio of the components of the grouting material, wt.%:

Expanding Additive 2-15

Gypsum 7-9

Hardening accelerator 2-8

The specified plasticizer 0.3-0.8

Lightweight supplement 3-10

Portland cement rest

The grouting material as a hardening accelerator contains a chloride salt of alkaline or alkaline earth elements.

The grouting material contains aluminosilicate microspheres, or silica fume, or expanded vermiculite, or expanded perlite as a facilitating additive.

For the preparation of grouting material, Portland cement is used, an expanding additive, at least one of the group: alumina cement, sulfoaluminate cement, aluminate-containing slag waste from the production of ferrotitanium, ferroboron, secondary remelting of aluminum, gypsum or a hardening accelerator that facilitates the additive, a plasticizer consisting of a mixture triethanolamine and silica-containing additives of multifunctional action - KMX.

KMX is a complex mineral chemical additive for concrete and mortar according to TU-58700-003-499-38-321-98, contains lignopane, neutralized air-entraining resin, S-3 superplasticizer and tripoli.

As gypsum, any of its modifications can be used.

Grouting material can be prepared as follows. By mixing the plasticizer and separately ground Portland cement, an expanding additive, a facilitating additive, a hardening accelerator, gypsum, followed by mixing with water, or by co-grinding a Portland cement mill, a lightening agent, hardening accelerator, gypsum, an expanding additive, followed by introducing a plasticizer together with mixing water. The material can be obtained by simple mixing of the components, and its mixing is carried out with water, in which a mixture of triethanolamine and a silica-containing additive of multifunctional action is dissolved.

The compositions and test results of the grouting material are given in tables 1 and 2.

Note to table 1:

* Alumina cement is used as an expanding additive in Example 1, a mixture of alumina cement and sulfoaluminate cement in a ratio of 1: 1 in example 2, 1: 1 ferrotitanium and ferroboron slag in an example 3, alumina cement and slag in an example 4 ferrotitanium in a ratio of 1: 2, in example 5 alumina cement and slag from secondary remelting of aluminum in a ratio of 1: 3, in example 6 - sulfoaluminate cement.

** In examples 1 and 2 - calcium chloride was used as a hardening accelerator, in examples 3, 4, 5 and 6 - sodium chloride.

*** As a facilitating additive, in examples 1 and 2, expanded vermiculite was used, in example 3, silica fume, in examples 4 and 5, aluminosilicate microspheres, and in example 6, expanded perlite.

**** ratio of components in the plasticizer: triethanolamine and cream-free additives in the composition of 1-1: 1, in the composition of 2-1: 8, in the composition of 3-1: 7, in the composition of 4-1: 9, in the composition of 5 -1: 2, in the composition of 6-1: 10

Claims (3)

1. Grouting material, including Portland cement, an expanding additive, gypsum, a hardening accelerator, a plasticizer, characterized in that it contains at least one additive from the group of alumina cement, sulfoaluminate cement, aluminate-containing slag waste from the production of ferrotitanium, ferroboron as an expanding additive , secondary remelting of aluminum, as a plasticizer - a mixture of triethanolamine and a silica-containing additive of multifunctional action - KMX in a ratio of 1: 1 to 1:10 and additionally contain additive facilitates the following ratio of grouting material, wt.%: Expanding Additive 2-15 Gypsum 7-9 Hardening accelerator 2-8 The specified plasticizer 0.3-0.8 Lightweight supplement 3-10 Portland cement rest 2. The grouting material according to claim 1, characterized in that it contains a chloride salt of an alkaline or alkaline earth element as a hardening accelerator. 3. Grouting material according to claim 1 or 2, characterized in that, as a lightening additive, it contains aluminosilicate microspheres, or silica fume, or expanded vermiculite, or expanded perlite.