Composition for confinement of water inflow into well

FIELD: oil and gas production.

SUBSTANCE: composition is made up of 90.0-95.0% sodium silicate solution with concentration 1.36 g/cm3 and silica modulus 3.0, 3.0-8.0% alkali metal silicofluoride, 1.0-4.0% wood flour, and 1.0-4.0% triacetine. Composition can be used during repair operations on oil production stings, when disabling formations, and when confining water inflow.

EFFECT: increased insulation capacity of grouting compositions.

1 tbl

 

The invention relates to the oil and gas industry, in particular compositions for the repair and insulation works in producing wells, and plugging flushed zones in the injection wells.

Known composition for the isolation of brine in the borehole containing a silicate of an alkali metal silicofluoride and sodium [1]. The disadvantages of this mixture are short term curing plugging mixture (not enough to penetrate into the zone violations) and syneresis plugging mass, followed by its shrinkage. The last of these shortcomings contributes to casing exits and, consequently, reduces the quality of supports and reliable operation of the wells after the repair and insulation works.

The aim of the invention is the improvement of water properties, elimination of shrinkage and the increase in the maturity band of curing cement compositions.

The solution of this problem is achieved by the fact that the composition for insulation of water in wells contains an aqueous solution of sodium silicate and sodium silicofluoride, as an aqueous solution of sodium silicate composition contains the specified solution with a density of 1.36 g/cm3, silicate module 3 and additionally triacetin-acetic acid triglyceride and wood flour at the following content, wt.%:

Wagnerstr of sodium silicate with a density of 1.36 g/cm 3and silicate module M=3,0 90,0-95,0

Silicofluoride sodium 3,0-8,0

Wood flour 1,0-4,0

Triacetin 1,0-4,0

The features of the invention

Common to the known and proposed compositions for isolation is that they include an aqueous solution of sodium silicate and sodium silicofluoride. Salient features of the invention are:

1. An aqueous solution of sodium silicate has a density of 1.36 g/cm3and silicate module M=3,0.

2. To reduce the amount of sodium silicofluoride and as a regulator of the timing of the curing composition contains triacetin.

3. As the filler composition contains wood flour.

Studies on the patent and scientific literature showed that this set of features is new and not previously used, and this in turn allows to make a conclusion about the technical solutions according to the criterion of “novelty”.

Characteristics of reagents used are as follows.

An aqueous solution of sodium silicate is a thick liquid yellow or gray according to GOST 13078-81.

Silicofluoride sodium technical - fine crystalline powder of white color, satisfying the requirements of THE 113-08-587-86.

Triacetin technical - transparent colorless or shade from light yellow to light brown C the ETA liquid on THE 7511903-571-99.

Wood flour is a product of the dry mechanical chopping wood GOST 16361-87.

Preparation of composition in field conditions is as follows. In the hopper of the unit preparing the pulp from 0,08 t silicofluoride sodium 0,04 t of triacetin and 0.04 tons of wood flour. To the resulting slurry from tank trucks poured 1.35 m3an aqueous solution of sodium silicate with a density of 1.36 g/cm3and silicate module M=3, mixed well and injected into the well. Push plugging mixture estimates of the total amount of produced water. Developed cement compositions were tested in a tubular reservoir models at 20°C. the Permeability of reservoir models, plugged compounds with an optimal ratio of ingredients, zero. The proposed injection of the composition into the reservoir leads to the formation of gel-like or solid screen, which leads to almost zero permeability. Time gel curing or stone governed by the amount of sodium silicofluoride and triacetin.

Ratio of components, the technological parameters of the composition for insulation and prototype shown in the table.

The data obtained indicate that with the minimum content of sodium silicofluoride plugging mass is not formed, when the maximum content of sodium silicofluoride, Tampa the most important stone is formed in a short time, which is not enough to produce composition into the reservoir. The introduction of triacetin allows you to reduce the amount of sodium silicofluoride, and adjust the timing of the curing cement composition, and wood flour prevents syneresis and eliminates shrinkage.

The use of the composition for insulation provides compared to the prototype improvement of water properties by eliminating shrinkage and increase range of curing time.

Bibliography

1. USSR author's certificate 834343, CL E 21 In 43/32, 1981. The prototype.

Table

Compositions based on aqueous solution of sodium silicate with silicate module M=3.0 and a density of 1.36 g/cm3at a temperature of 20°C
No.Mass %Coagulation time, h minThe amount of released water %The condition of the backfill massPermeability, ml/2 min at a pressure of 1 MPa
 An aqueous solution of sodium silicateTransperancy sodiumTriacetinWood flour    
190,08,01,0 1,0015-stone0
292,06,01,01,0025-stone0
391,04,04,01,0115-stone0
493,04,03,0-1300,9stone0
592,04,02,02,0140-stone0
695,04,01,0-1500.7stone0
792,04,0-4,0240-tight. gel1,2
897,03,0--345-gel4,5
998,51,5--- the e cures 45-50
The composition of the prototype:       
8713--0205stone0

Composition for insulation of water in wells containing an aqueous solution of sodium silicate and sodium silicofluoride, characterized in that it contains as an aqueous solution of sodium silicate above solution with a density of 1.36 g/cm3and silicate module M=3.0 and additionally triglyceride acetic acid, triacetin and wood flour in the following ratio, wt.%:

An aqueous solution of sodium silicate with a density of 1.36 g/cm3and silicate module M=3,090,0-95,0
Silicofluoride sodium3,0-8,0
Wood flour1,0-4,0
Triacetin1,0-4,0



 

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