Liquid for killing wells

 

(57) Abstract:

The invention relates to oil and gas extraction, drilling oil and gas wells, in particular liquids for perforating and plugging of wells. The technical result is the preservation of reservoir properties of productive layers at their secondary opening and workover, simplifying the technology of cooking liquids for well killing, improving the quality of well development, the expansion of the raw materials base materials for the preparation of liquids. Liquid for killing wells contains reagents - fluid filter, as a foaming agent - waste isopropyl alcohol from the stage sludge of crude alcohol and rectification of apurate, as the dispersed phase - lime, the dispersion medium is a solution of chloride salts of sodium, magnesium, aluminum in the following ratio, wt.%: lime 10-30, chloride salts of sodium, magnesium, aluminum 5-25, waste isopropyl alcohol 0.5 to 1.5, the reagent fluid filtration 0-1,5, water the rest. table 1.

The invention relates to oil and gas extraction, drilling oil and gas wells, in particular liquids for perforating and plugging of wells.

Also known GIGS, including bentonite, polyacrylamide, kssb, foaming agent and water [2].

The main disadvantages of these GIGS are a large number of constituent components, the complexity of preparation, low resistance pins, high cost.

The aim of the invention is the preservation of reservoir properties of productive layers at their secondary opening and workover, simplifying the technology of cooking GIGS, improving the quality of well development, the expansion of the raw materials base materials for the preparation of EGS.

This objective is achieved in that in GGS comprising a dispersive medium, the dispersed phase, the foaming agent, the reagent fluid filter, as a foaming agent used waste isopropyl alcohol from the stage sludge of crude alcohol and rectification of epurate as the dispersed phase - lime, and the dispersion medium is aqueous solutions of the chloride salts of sodium, magnesium, aluminum in the following ratio, wt.%:

Lime - 10 - 30

Chloride salts of sodium, magnesium, aluminum and other - 5 - 25

Waste isopropyl alcohol the marketing of alcohol (DESCRIPTION) sludge from the stage of raw spirit and rectification of epurate are a mixture of normal hydrocarbons, isotrate, containing three - and terpolymer, propylene and other low molecular weight polymers, as well as aldehydes, ketones, isopropylene alcohol. Appearance - this oily liquid, insoluble in water, soluble in sulphuric acid.

A dispersion GIGS are aqueous solutions of salts of sodium, magnesium, aluminum, and other Dispersed phase are particles of lime.

The invention is implemented as follows. The estimated quantity of lime intensively stirred in fresh or brine water, if necessary, add salt. In the resulting milk of lime with vigorous stirring with access of air is added to the DESCRIPTION and reagents-fluid filtration. It turns out resistant foam. Laboratory results are shown in table.

Use GGS this formulation reduces the filter, simplifying component composition, preparation technology. By reducing the number of components reduces the cost. Expanding the raw material base material crystals. Excluded irreversible clogging of the reservoir, as well as the swelling of clay minerals formation. The positive effect can be attributed frost GIGS this Amnesty 1.18 g/cm3. Under vigorous stirring is added 6 g DESCRIPTION and 2 g of CMC. After 30 min stirring the obtained foamy mass with the following parameters:

The density of 0.75 g/cm3< / BR>
The viscosity of SST-5 stagnant.

Filtering 10 cm330 min.

Density after 2 h 0,78 g/cm3.

Density after 1 day of 0.80 g/cm3.

Sources of information

1. Directory of killing fluids. Krasnodar, 1989, S. 12-23, 42-46.

2. USSR author's certificate N 1208192, 1986.

Fluid for plugging wells comprising a dispersive medium, the dispersed phase, the foaming agent, the reagent fluid filter, characterized in that the foaming agent used waste isopropyl alcohol from the stage sludge of crude alcohol and rectification of apurate, as the dispersed phase - lime, and the dispersion medium is aqueous solutions of the chloride salts of sodium, magnesium, aluminum in the following ratio, wt.%:

Lime - 10 - 30

Chloride salts of sodium, magnesium, aluminum - 5 - 25

Waste isopropyl alcohol from the stage sludge of crude alcohol and rectification of epurate - 0,5 - 1,5

Reagents - fluid filtering - 0 - 1,5

Water - Octalin

 

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FIELD: oil and gas production.

SUBSTANCE: solid foaming agent containing, wt %: carboxymethylcellulose 15-25, sodium sec-alkyl sulfate 5-15 and sodium sulfonate 25-35 (both anionic surfactants), additionally contains: sodium silicate 3-7, sodium carbonate 2-4, disodium ethylenediaminetetraacetate as complexone 1-3, and foaming-enhancing detergent - the rest.

EFFECT: increased efficiency in carrying over formation fluid from bottom of gas and gas condensate wells.

1 tbl

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