SU1416669A1 - Viscous plastic material for isolating formations - Google Patents

Abstract

The invention relates to an oil and gas production industry and makes it possible to increase the insulating ability of a material by adjusting the time of gelation and increasing its durability. The material includes the following components in their ratio, wt.%: Hypan 1.0; liquid glass 7.0-10.0; gel regulator - hydrochloric acid 0.3-0.7; inert filler 5,0-10,0; additive swelling in water 0.5-1.0; water the rest. As an additive that swells in water, the material contains powdered carboxymethylcellulose or condensed sulphite-alcohol bard or carbon alkaline reagent. For the preparation of 1 ton of material, 393 l of fresh water are poured into the container and, with stirring, 267 kg of lignin, 200 kg of 10% aqueous solution of hypane, 100 kg of water glass, 30 kg of 20% hydrochloric acid and 10 kg of carboxymethyl are sequentially added. cellulose. After stirring the mixture for 3-5 minutes, it is pumped into squalax. 1 hp A-ly, 1 tab. (in cl

Description

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The invention relates to the oil and gas industry, in particular, compositions for isolating or limiting water inflow into wells, for plugging formations in order to eliminate absorption of liquids or gas-oil pipelines, for packing wells and other technological operations that require temporary disintegration and isolation of formations.

The aim of the invention is to increase the insulating ability of a visco-plastic material by adjusting the time of gelation and increasing its strength,

In the plastic material includes hypan, water glass, inert filler, hydrochloric acid, water, and carboxymethylcellulose (KMlO or condensed sulfate alcohol (BCC) or powdered carbon alkaline reagent (U1CR) in the following ratio of components, wt.%: Gipan

Liquid glass Hydrochloride-acid Acid Inert1 filler5, 0 Additive swelling in water Water

As a water-swelling additive, powdered reagents are used: carboxymethyl cellulose (CMC), condensed sulfite alcohol bard (SSC), or carbon alkali reagent (SCP).

The table shows the compositions of visco-ductile materials and their technological parameters.

A flexible material can be obtained in two ways.

I. An inert filler is dispersed in water, then hypan and water glass are added, and the mixture is stirred until uniform. Hydrochloric acid and an additive swelling in water are successively introduced into the resulting mixture.

II. The flexible material is prepared in two stages.

1.0 7.0 0, 3 3, 0 10.0

0.7 10.0

0.5 - 1.0 Else.

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0

2) In the other half of the water, the remaining part of the inert filler and hydrochloric acid, liquid glass, and an additive are swelled.

Prepared solutions are mixed before use.

Examples illustrating the invention.

For the preparation of 1 ton of plastic material of the following composition, wt.%: Hypan 2.0; liquid glass- 5 lo 10.0; hydrolytic lignin 8.0; CMC 1.0; no 0.6 and water the rest (78.4%).

To prepare such a composition, it is necessary to take 200 kg of a 10% commercial solution of hypan with a density of 1.065 g / cm, 100 kg of commercial liquid glass with a density of 1.45 g / cm, 267 kg of lignin with a moisture content of 70%, 10 kg of CMC, 30 kg of 20% - hydrochloric acid - 5 lots with a density of 1.1 g / cm and 393 kg of fresh water.

In the first method, 393 l of fresh water are poured into the container and, with stirring, are added successively, kg: 267 lignin, 200 to 10% aqueous solution of hypane, 100 liquid glass, 30 to 20% hydrochloric acid, and 10 CMC. After mixing the mixture for 3-5 minutes, it is pumped into the well.

According to the second method, zoplastic fluids of the same composition are prepared as follows.

Separately, two solutions of the following composition are prepared, kg: Composition No. 1

1/2 h. Pignin 133.5

Gipan 1 0% 200

1/2 h Acids 15.0

Fresh water 141.5

five

0

Composition number 2

1/2 h Lignin 133.5 Liquid glass 100 1/2 h Acids 15.0 CMC 10

The water is fresh 251.5. Since before the beginning of gelation, the solutions have the same viscosity, which differs little from viscosity

Rav-g and water are preliminarily prepared, at the same time separate volumes of the two solutions: 1) 1/2 of the inert filler, hypan, 1/2 of the chlorinated water and half of the calculated amount of water are injected into the well, they are easily mixed, forming after the time of thickening of the gel, while since VV, the time of their injection

when they are injected into the well, they are easily mixed, forming a gel after the thickening time has elapsed, and since V, the time of their injection

ten

15

20

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the same units will be the same.

The preparation is determined by the thickening time and the purpose of the preparation in the plastic material.

For example, in a plastic material (VPM) is used for water isolation of formation water into the well. For these purposes, as can be seen from the data in the table, different compositions can be used (for example, Р№ 10 and 12).

Solution No. 10 has a gel period of 45 minutes, i.e. the thickening time is sufficient to inject it into the formation in order that the gelation of the fluid takes place directly in the formation. Therefore, it is possible to prepare VPM in any way.

However, in the first method of preparation, in the case of a delay in carrying out the isolation work, there is a danger that the prepared solution will thicken before it is pumped into the formation and turn into a non-pumpable mass Dp to eliminate this drawback, it is advisable to prepare it in the second way, since the VSD prepared in this way thickens separately prepared solutions. The gel time for formulation No. 13 is only 10 minutes. Therefore, it is necessary to prepare it only in two stages, and the injection of solutions should be carried out simultaneously; one on the elevator column of pipes, and the other on the annulus. The solutions, mixing directly at the treated formation and penetrating into it, form a plugging gel directly in the formation.

If separately prepared solutions are simultaneously pumped, for example, only into an elevator column.

25

thirty

35

viscous mass with gel clots floating in it, the penetration of which is possible only in highly permeable interlayers.

However, this property of VPM can be used for other purposes, for example, to eliminate absorption of liquids, interval treatment of the formation, etc.

There are other areas of VPM application, for example, the installation of naKejia or the killing of wells by partially filling its upper cavity in a flexible material.

Claims (2)

1. In zkoplastichesky material for isolating layers, including hypan, water, gel regulator, characterized in that, in order to increase its insulating ability by adjusting the gelation time and increasing its strength, it additionally contains liquid glass, inert filler and additive swelling in water, hydrochloric acid (HC1) is used as a regulator of gelation in the following ratio of components, wt.%: Hypan1.0-3.0 Liquid glass 7.0 - 10.0 Hydrochloride-acid (HC1) Inert filler Water Swelling Additive 2. Material according to that. 0.3 5.0 0.7 10.0 0.5 - 1.0 Else. 1, that as an additive that swells in water, it contains powdered carboxy or only in the annulus, the gel-like methyl cellulose, or condensation, will begin before the mixture reaches the sulfite sludge, or treat the impregnated formation with the formation of carbon alkali reagent. 0 five 0 about 25 thirty 35 viscous mass with gel clots floating in it, the penetration of which is possible only in highly permeable interlayers. However, this property of VPM can be used for other purposes, for example, to eliminate absorption of fluids, interval treatment of the formation, etc. There are other areas of application: neither VPM, such as installing naKejia or killing wells by partially filling its upper cavity in a flexible material. Invention Formula 1. In zkoplastichesky material for isolating layers, including hypan, water, gel regulator, characterized in that, in order to increase its insulating ability by adjusting the gelation time and increasing its strength, it additionally contains liquid glass, inert filler and additive swelling in water, hydrochloric acid (HC1) is used as a regulator of gelation in the following ratio of components, wt.%: Hypan1.0-3.0 Liquid glass 7.0 - 10.0 Hydrochloride-acid (HC1) Inert filler Water Swelling Additive 2. Material according to that. 0.3 5.0 0.7 10.0 0.5 - 1.0 Else. 1, about t l and - that as an additive swelling in water, it contains powdered carboxy VO "Tl o Ch vO y g "and H.- about oh oh about go tn ON "h pj - About 1L 1L 00 G4 eo "HF (M (M - “t R  - about Vd h M (O ““ - “about sc h m “Ech - fv | - about "about 1L" - (H SP fO - 1fO "M" n th Oi rОС 00 about 00 I about about 1L about "L P cho about oh oh "about ON ABOUT ABOUT 00 at SB in Oh oh il about go sr "H " go w chg about with About rt with SL 00 "- m d "H I f th in o eo (H with “o in ABOUT 00 about o mid f 00 "N with four oo 00 - G 00 - HF in rv " "K about in "K about 1G | about in in about about sh l - about about BUT 00 00