SU1745747A1 - Water-in-oil emulsion for killing and completion of wells - Google Patents

Abstract

The essence of the invention: an increase in the thermal stability of the invert emulsion and the expansion of the raw material base due to the content in the emulsion sludge from the production of alkyl benzene additives for lubricating oils 35-80 wt.%, The water groove 20 - 65 wt.%. 1 t, abl.

Description

The invention relates to the oil and gas industry, in particular, to hydro-bob emulsions used in plugging and well completion.

Known invert emulsion for killing and completion of wells, containing oil or oil product, water and emulsifier - amidoamine acids of tall oil in the following ratio of components, vol.%: Oil or oil product38, 0 - 69.5 Water30.0 - 60.0 Amidoamines Tall oil acids 0.5-2.0 The disadvantage of this emulsion is high filtration performance at elevated temperatures, as well as the use of expensive, scarce target products.

Closest to the invention is an invert emulsion for killing and completing wells. This invert emulsion containing hydrocarbon liquid, emulsifier stabilizer and aqueous Azou as a hydrocarbon liquid and stabilizer emulsifier contains sludge from the production of sulphonate additives for lubricating oils in the following ratio of components,%: Sludge from the production of sulphonate additives to lubricating oils 20 - 90 Water base 10-80 The disadvantage of this emulsion is the low thermal stability (10 ° C) ° C.

The aim of the invention is to increase the thermal stability of the invert emulsion and the expansion of the raw material base.

The goal is achieved by the fact that an invert emulsion for killing and completion of wells containing

Ј CD

35 - 80 20 - 65

26

27

20

five

38 36 30 10

hydrocarbon liquid, emulsifier-stabilizer and the aqueous phase, as hydrocarbon liquid and emulsifier-stabilizer contains sludge from the production of alkyl adhesives for lubricating oils in the following ratio of components,%:

yp from production

alkylphenol lubricant additives

Water phase

Sludge from the production of alkylphenolic additives (ROS) for lubricating oils is a finely dispersed system of the following composition, wt.%:

Hydrocarbon liquid

Calcium Alkylphenol T

Calcium Carbonate

boda

This sludge is an integral part of the production of ROS additives for lubricating oils. However, it does not find qualified use and burns more than 1000 tons per year.

Fresh water or mineralized water containing soluble salts of Сag4, Hg2, Na +, K + and other metals can be used as an aqueous phase in the elsia.

A comparative analysis of the proposed emulsion with the known one shows that the proposed emulsion differs from the known one by introducing a new component, sludge, from the production of alkylphenolic lubricant additives.

As shown by experimental studies (tables, experiment 9), the use of only one surfactant of the sludge composition - calcium alkylphenol and calcium (ROS additive) does not impart an emulsion of high heat resistance. However, the combined action of alkylbenol calcium and highly dispersed calcium carbonate provides the effect of significantly improving the thermal stability of an inert emulsion.

An inert emulsion is prepared as follows.

A calculated amount of sludge is pumped into a tank equipped with a mixing device, and then the aqueous phase is introduced in small portions with vigorous stirring. After completion of the introduction of the aqueous phase, the invert emulsion is stirred for an additional 30–60 minutes until its rheological parameters are stabilized.

Under laboratory conditions, the invert emulsion is tested at different ratios of the components. To prepare the emulsion, sludge from the production of alkylphenol additives of the following composition is used, wt%: Hydrocarbon liquid 33 Calcium alkyloenolate 32 Q Calcium carbonate 27 Water8

During testing, the following technological parameters are recorded: conditional viscosity, static shear stress 5, filtration, thermal stability. The emulsion viscosity (s) was determined on a viscometer, the static shear stress (dPa) on the SNS-2 instrument, and the filtration rate on the filtrate press PFP-200.

Example, Invert Emulsion Preparation.

It is necessary to kill a well.

prepare 5 m3 of invert emulsion

5 with a density of 1040 kg / m3. For this is spent

4 m3 (80% by volume) sludge and 1

ml

0

five

0

five

0

(20 vol.%) Water. The emulsion is prepared using the CA-320 cementing unit by introducing water into the measuring tank with sludge while stirring for 1.0-1.5 hours. Other emulsion formulations are prepared in the same way.

The test results of the proposed emulsion are presented in the table, for comparison, it also shows the result of testing the prototype with the optimum ratio of components.

It follows from the table that the content of the aqueous phase is 20–65 vol.%. With a content of less than 20% by volume of the aqueous phase, the emulsion does not have sufficient thixotropic properties, which leads to the precipitation of calcium carbonate. With a content of more than 65 vol.% Of the aqueous phase, the structural and mechanical properties of the emulsion increase excessively, which impairs its pumpability. The introduction of 35-80 wt.% Sludge from the production of alkylphenolic additives to lubricating oils in comparison with the prototype increases the thermal stability of the emulsion more than doubled and significantly reduces filtration at temperatures up to 200 ° C.

The presence in the aqueous phase of the emulsion of salts of monovalent and divalent metals does not significantly affect the technological parameters and a few

3 1

increase its thermal stability (table, compositions 7, 8).

Claims (1)

Invention Formula An invert emulsion for killing and completion of wells, containing a hydrocarbon fluid, an emulsifier-stabilizer and an aqueous phase, characterized in that, in order to improve thermal stability 45747 emulsion and expansion of the raw material base, as a hydrocarbon liquid and emulsifier-stabilizer, it contains sludge from the production of alkylphenolic additives to lubricating oils in the following ratio of components,. wt.%: Sludge from the production of alkylphenolic lubricant additives 35 - 80 Water phase 20 - 65 ten zvest 1SHAM from the production of sulfate additives 40 371 122 Water 60 extendable 2SHAM from production additives AFK85 242 O Water phase (technical water) 15 3Plan from production additives AFK80 281 25 Water phase (tech water) 20 4Ipam production additives AFK50 372 116 Vodna Laza (technical water) 50 5Flow from production additives afk35 dripping 255 Vodna Aaza (Technoprom) 65 6Plan from production additives LFK30 Not those - 350 Water phase (technical quality yes) 70 7SHAM from production additives LFK35 Dripping 259 Aqueous phase (10% water solution Nad) 65 About Olam from production additives LFK35 Dripping 262 Aqueous phase (30% aqueous solution of CAC) 65 Emulsion with one surfactant from the composition of the sludge from the production of additives AFK 9Diesel35 Calcium Llkylphenol 15 29753 Water phase (technical water) 50 148 Bad Bad 105 004 250 32 O3 250 137 02 240 288 04 230 350 016 215 282 O3 235 289 02 240 71 Polna Polna 85