RU2229584C1 - Water isolating composition - Google Patents

Abstract

FIELD: oil extracting industry. SUBSTANCE: composition includes acid, zeolite component for producing synthetic cleaning substances and water. As acid technical acidic substance "Netrol" is used with following ratio of components in percents of mass: zeolite component for producing synthetic cleaning substances - 5-15, technical acidic substance "Netrol" - 10-15, water - the rest. EFFECT: increased gel forming speed. 2 ex, 1 tbl

Description

The invention relates to the oil industry, in particular to compositions for conducting waterproofing works, and can be used to regulate the filtration flows of oil reservoirs, during overhaul of wells.

To reduce water cut and selective isolation of formations, to control the permeability of watered interlayers, gel-forming compositions are used.

Known gel-forming compositions based on various chemicals, in particular polymers [1], organosilicon materials based on oligoorganoethoxychlorosiloxanes (trade name 119-204) [2, 3]. Silicate gelling compositions are also known [4, 5].

A disadvantage of the known compositions is their low efficiency due to the difficulty of controlling the rate of gelation, low structural stability, as well as the high cost of gel-forming components, which significantly limits the scope of application of the compositions.

The closest technical solution to the proposed one, i.e. the prototype is a gel-forming composition [6], which includes hydrochloric acid, water and an additive from the class of aluminosilicates, which is used as a zeolite component for the production of synthetic detergents in the following ratio of components, wt.%:

Zeolite component for

synthetic production

detergents 4-10

Hydrochloric acid 6-12

Water Else

The disadvantages of this composition are the low gelation rate, insufficient strength of the obtained gels, a slight decrease in the permeability of the rock after pumping a gel-forming composition into them.

An object of the present invention is to increase the rate of gelation.

This goal is achieved in that the water-insulating composition, including acid, a zeolite component for the production of synthetic detergents and water, contains the technical acid “Netrol” as an acid in the following ratio of components, wt.%:

Zeolite component for production

synthetic detergents 5-15

Technical acid means “Netrol” 10-15

Water Else

Thus, in the present invention uses a new ingredient, which gives reason to assert that the proposed solution meets the criterion of "novelty."

The scientific, technical and patent literature has not previously provided information on the use of the technical acidic agent “Netrol” in the preparation of waterproofing compositions. Previously, hydrochloric acid was used to prepare such compositions. The use of the Netrol technical acidic agent enhances the gelation and hardening of the resulting compositions due to the fact that the nitric acid, which is the basis of the Netrol technical acidic agent, interacts with alumina and silicon oxide contained in the zeolite component for the production of synthetic detergents, forms aluminum and silicon hydroxides, which, due to the amphoteric properties of polyvalent cations, are able to form a spatial gel, which hardens in time. The use of dry ingredients allows you to get a dry mixture in advance, which before preparation only needs to be mixed with water.

Thus, the foregoing indicates the conformity of the claimed invention to the criterion of "inventive step".

An example implementation of the invention

To prepare 100 ml of the solution (composition No. 3, table), 7 g of the zeolite component for the production of synthetic detergents, 10 g of the technical Netrol acidic agent (in terms of 100 g of dry matter) and 83 ml of water are taken. The zeolite component for the production of synthetic detergents and the technical acid agent Netrol were manually mixed for 1 minute and then mixed with water. The resulting mixture was mixed manually or on a magnetic stirrer for 25 minutes. Samples in which viscosity was determined using a capillary viscometer were periodically taken from the prepared composition. A kinematic viscosity of 25 mm ² / s was adopted as a gelation criterion.

In this example, the gelation time at a temperature of 20 ° C was 18 hours.

When determining the gelation rate at a higher temperature (75 ° С), the obtained sample was thermostated.

To prepare the water-insulating composition, we used a zeolite component for the production of synthetic detergents, which contains silicon, aluminum, and potassium oxides and is produced according to TU 381011366-94 and Netrol technical acidic agent manufactured by Polyprom-A CJSC according to TU 27081564042-98 (with up to 46% nitric acid).

The prepared compositions of the waterproofing compositions are shown in the table. It also shows the performance of the prototype. Based on the data presented in the table, we can conclude that the inventive waterproofing composition containing the technical acidic agent “Netrol”, a zeolite component for the production of synthetic detergents and water, has a high gelation rate and high gel strength. The best indicators for the gelation rate are given in experiments 3, 6, 9.

In the industrial implementation of the invention, obtaining a water-insulating composition is as follows (for example, composition No. 9, see table).

2400 liters of water are poured into the capacity of the cementing unit. A pre-prepared dry mixture of 150 kg of zeolite component for the production of synthetic detergents and 450 kg of technical acid “Netrol” is poured into the hopper of a cement mixing machine. The cementing unit and cement mixing machine are tied up, and a mixture of the zeolite component for the production of synthetic detergents and Netrol is closed on the prepared water. The resulting composition is pumped into the measured capacity of the cementing unit and mixed for at least 25 minutes by circular circulation. Then, the composition is pumped into the formation through tubing or drill pipe and left to structure it and harden the gel in the pores of the formation.

Thus, the example implementation of the invention shows its compliance with the criterion of "practical applicability".

Sources of information

1. Surguchev M.L. Secondary and tertiary methods of increasing oil recovery. - M .: Nedra, 1985.

2. A.S. No. 1680949, BI No. 36, 1991.

3. A.S. No. 1808998, BI No. 14, 1993.

4. Pat. US No. 4257813, CL 106-74.

5. Pat. US No. 4640361, CL 116-258.

6. RF patent application No. 96100600/03. Gel-forming composition, BI No. 9, 03/27/1998.

Claims (1)

A water-insulating composition including acid, a zeolite component for the production of synthetic detergents and water, characterized in that it contains the technical acid “Netrol” as the acid in the following ratio, wt.%: Zeolite component for production synthetic detergents 5 - 15 Technical acid agent “Netrol” 10 - 15 Water Else