Composition for insulation of water in the well

 

The invention relates to the oil and gas industry, in particular, compositions for isolation or restriction of water production in oil and gas wells. Composition for insulation of water in the well containing sodium silicate, polyhydric alcohol, electrolyte, additive and water, the electrolyte contains alumoxane, and as an additive - glass microspheres, in the following ratio, wt.%: sodium silicate 10,3-12,9, polyhydric alcohol 2,2-8,5, alumoxane 2,3-4,6, glass microspheres of 0.2-0.3, water the rest. The technical result improved insulation quality of the water in the well by increasing the time of gel formation and increasing its strength under normal conditions and moderate temperatures. table 1.

The invention relates to the oil and gas industry, in particular, compositions for isolation or restriction of water production in oil and gas wells.

Known viscoplastic material for insulation layers containing gipan, liquid glass, hydrochloric acid, an inert filler, swelling additive and water [1].

The disadvantage of this composition is a short time of gelation and low strength of the resulting gel, skim to the claimed purpose and essential features is the composition for insulation of water in the well, containing silicate of sodium, an electrolyte, water, polyhydric alcohol, and wood flour in the following ratio, wt.%: Sodium silicate - 6-8 Polyhydric alcohol - 5-10 Electrolyte - 0,4-0,8 Wood flour - 2-5 Water - the Rest as a polyhydric alcohol use glycerin or glycol, and the electrolyte is calcium chloride [2].

The disadvantages of this structure are the a short time of gelation under conditions of moderate temperatures and insufficient strength of the gel.

The objective of the proposed technical solution is improving the insulation quality of the water in the well by increasing the time of gel formation and increasing its strength under normal conditions and moderate temperatures.

To solve this problem the claimed composition for insulation of water in the well containing sodium silicate, polyhydric alcohol, electrolyte, additive and water, the electrolyte contains alumoxane, and as an additive - glass microspheres, in the following ratio, wt.%: Sodium silicate - 10,3-12,9 Polyhydric alcohol - 2,2-8.5 Alumoxane - 2,3-4,6
Glass microspheres - 0,2-0,3
Water - the Rest
Distinctive feature of the proposed structure is the content as electroly aetsa tonnage of waste production, a by-product of the processes of petrochemical synthesis, and is available in JSC "Salavatnefteorgsintez" in THE 38.302163-89, as well as other companies in the chemical and petrochemical industry, for example, JSC "caustic" , Sterlitamak. Alumoxane is a transparent liquid containing 20-25 wt. % basic substance or powder light yellow or greenish color with a faint odor of hydrochloric acid. Alumoxane refers to hazardous compounds (IV hazard class according to GOST 12.1.007-76), miliaresion, does not freeze at low temperatures.

Alumoxane widely used in the technology of water treatment system water treatment to prevent scale formation, and also in the composition of drilling fluids [3, 4].

Glass microspheres are easy, free-flowing white powder, consisting of separate hollow spherical particles with a size in the range 15-200 μm. Microspheres produced from retrieveservicename glass in JSC "NPO Fiberglass".

It is known the use of glass microspheres as facilitating an additive in cement mortars [5].

The high strength of the inventive composition to give microspheres which are in contact with molten glass entering hee is dispersed environment and adsorb on their surface molecules of sodium silicate, is uniformly distributed in the bulk of solution, forming a composite material.

Achieved by carrying out the invention the technical result is to increase the bridging properties of the composition by increasing the strength of alumosilicates and ensure the time of gelation required for delivery of this composition in the isolated interval of the wells under normal conditions and moderate temperatures, which ensures high quality of insulation layers.

It is known that the interaction of sodium silicate with various acids and salts (including hydrochloric acid and calcium chloride) formed silicasol that when the gel into the silica gels [6].

As part of the prototype the formation of silica gel occurs in the reaction equation
l2+Na2SiO3+2H2O=CA(Oh)2+H2SiO3+2NaCl,
where the basis of gelation is the Sol of silicic acid and calcium hydroxide does not form a colloidal solution.

The authors experimentally found that the interaction of aluminum chloride with sodium silicate in the reaction equation
2ll3+3N2SiO3+6H2O-2l(OH)3+3H2SiO3+6NaCl,
in addition to the stated speeds up the process of gelation.

Minor additive glass microspheres, which are homogeneous with sodium silicate, performs the function of a disperse medium and adsorbs on its surface sodium silicate, accelerating the process of gelation and procrea gel structure.

Polyhydric alcohol, such as ethylene glycol to prevent premature coagulation of the composition and is a regulator of time of gelation.

In the physico-chemical interaction between the components is formed alumosilicate, which is then in contact with the microspheres becomes strong alumosilicate.

The claimed technical solution integrated use of distinctive features allows to solve the new technical problem - improving the insulation quality of the water in the well by increasing the strength of the resulting gel, ensure that the time required for its formation under normal conditions and moderate temperatures, which allows to make a conclusion on the conformity of the proposed technical solution the criterion of "inventive step".

The inventive composition is prepared as follows.

First, prepare two equal volume of a solution by mixing the reagents. In field condition is lsout impeller mixer.

The first solution is obtained by dissolving trademarks of sodium silicate in water. The second solution is obtained by dissolving in water of aluminum chloride and ethylene glycol.

Then in the prepared solution of sodium silicate thin stream (avoid instant coagulation [7]) add a solution of aluminum chloride and ethylene glycol and mix thoroughly until a homogeneous colloidal solution - alumosilicates, then with constant stirring add the microspheres to form a homogeneous solution.

In field conditions the solution was prepared separately in two cementing units. The prepared solution of sodium silicate is pumped into a mixing device, for example, in orignially capacity, then from another cementing unit with small feed pump solution of aluminum chloride and ethylene glycol under stirring to obtain a homogeneous solution, and then add glass microspheres with constant stirring.

The prepared structure of the mixing device into the borehole by known techniques.

To determine the time required for the gel formation, the pre-selected sample and after 24 h after which it from start cooking Zola to the rim of the gel, adhering to the walls of glass that can be detected by slight inclination of the latter. At the end of the gelation - the moment when the gel starts to "sound", i.e. make a sound when hitting the glass, sound like a stretched string [6].

Plastic strength of the composition was determined using the conical plastomer Rehbinder A. P. by well-known methods [8].

When conducting laboratory studies were used:
- tap water;
- alumoxane on THE 38.302168-89;
- ethylene glycol according to GOST 19710-83;
- sodium silicate (liquid glass) according to GOST 13078-81;
- glass microspheres MS-A9 on THE 6-48-108-94.

Example
Two glasses were prepared solutions of 50 ml each. For the preparation of the first solution took 42 g of water and dissolved in it 11,44 g of sodium silicate. For the preparation of the second solution took to 43.5 g of water and dissolved in it 3,05 g of aluminum chloride and 4,48 g of ethylene glycol. First glass in a thin stream poured the solution in the second beaker and stirred until a homogeneous colloidal solution (alumosilicates), then added 0.3 g of microspheres and stirred until complete mixing of the components. The prepared composition was left to monitor the formation of the gel, and after 24 h were determined GAVI with different content components, and the results of the research are reflected in the table.

The analysis of the table revealed that the composition of the prototype in a satisfactory time of gelation has a low strength 510-750 PA (experiments 1-3).

The proposed composition containing components in the claimed limits has increased strength (1100-1450 PA) and a large gelation time (experiments 4-16).

The strength of the claimed compositions in 2 times exceeds the strength of the compositions according to the prototype, and the formation of the gel allows you to ensure the delivery of the insulating composition to a considerable depth.

It is established that the optimum content of sodium silicate is 10.3-of 12.9 wt.%. With the increasing content of sodium silicate over to 12.9 wt.% and at the average values of the other components, the composition has a relatively short gelation time (experiment 17). When the content of sodium silicate is less of 10.3 wt.% not achieved the required strength of the composition (experiment 18).

The ethylene glycol is optimal in the range from 2.2 to 8.5 wt.%. When the content of ethylene glycol over 8.5 wt.% reduced time of gelation strength composition (experiment 21). The composition containing glycol is less than 2.2 wt.% has a significantly longer time to gel is ochloride 2,3-4.6 wt.% is optimal. When the content of aluminum chloride more than 4.6 wt.% the composition has a short time of gelation, which is only 2 hours and 50 MRC and 0 h 30 min (experiment 20). When the content of aluminum chloride less than 2.3 wt.% the strength of the gel is negligible (OPP 19).

The content of the microspheres of 0.2-0.3 wt.% is optimal. The microspheres content of more than 0.3 wt.% not advisable, since a portion of the microspheres POPs up, and the strength of the gel increases (experiment 24). When the content of the microspheres is less than 0.2 wt.% the strength of the gel is negligible (experiment 23).

The proposed composition due to the penetration of the injected solution in fractured high - and low-permeability zones allows you to block them at the stage of injection of the solution, to increase the filtration resistance and, thereby, to increase the coverage of the reservoir effect.

The proposed solution provides reliable insulation of the water in the well by increasing the strength of the composition and increase the gelation time required for delivery in the isolating interval.

Implementation of the proposed structure will reduce the time and expense of reagents for carrying out insulation work and to increase the production capabilities of oil and gas wells.

Sources of information
1. Avtorsko's certificate of the USSR 141163-69.

4. RF patent 2135542, IPC 09 To 7/02, publ. 27.06.99, BI 24.

5. Vyakhirev B. C. and other "Easy additive to cement mortars", J. "Gas industry", 6, 1997.

6. G. N. Hangingin "Chemical backfill wells", Costoptimized. 1953, S. 50, 51.

7. Voski S. S. "Colloid chemistry", M., Chemistry, 1964, S. 323.

8. Danyushevsky B. C. and other "reference guide grouting materials", M., Nedra, 1967, S. 336-337.


Claims

Composition for insulation of water in the well containing sodium silicate, polyhydric alcohol, electrolyte, additive and water, wherein the electrolyte it contains alumoxane, and as an additive - glass microspheres in the following ratio, wt. %:
Sodium silicate - 10,3-12,9
Polyhydric alcohol - 2,2-8,5
Alumoxane - 2,3-4,6
Glass microspheres - 0,2-0,3
Water - The Rest

 

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