Reagent for the removal vodokanalstroi mixture from the well

 

(57) Abstract:

The invention relates to the field of gas and gas condensate, namely the removal vodokanalstroi mixture from the wells containing produced water and gas condensate, especially from wells with abnormally low formation pressure. The technical result is to increase the efficiency of removal vodokanalstroi mixture of gas-condensate wells and the reservoir fluid with high mineralization of gas and gas condensate wells. As a reagent for the removal vodokanalstroi mixture from a well used polyvinyl alcohol brand 18/11. table 2.

The present invention relates to the field of gas and gas condensate, namely the removal vodokanalstroi mixture from the wells containing produced water and gas condensate, especially from wells with abnormally low formation pressure.

Known reagent for the removal of fluid from the wells containing the surfactant - surfactant - “Progress”, produced by THE 38-10719-92 Novocherkassk plant of synthetic products [1].

Surfactant “Progress” has the following characteristics:

- color aqueous solution with mass fraction of surfactant 5% optical S="ptx2">- mass fraction of sodium sulfate, % not more than 3,5;

- mass fraction desulfation hydrocarbons in relation to the active substance,%, not more - 0,9;

- mass fraction of isopropyl alcohol, % not more than 3,5;

the concentration of hydrogen ions, the pH of the commodity product - 7,5-9,0;

mass fraction of iron, % not more than 0,01;

density, g/cm3- not standardized;

- mass surfactants in g, corresponding to 1 cm3solution NaH concentration (NaOH) 0.5 mol/DM3- not standardized; 0.5 mol/ DM3- is not specified.

However, when the content of a gas condensate reservoir fluid more than 20% by volume of the surfactant action “Progress” gets worse or stops completely.

The aim of the present invention is to increase the efficiency of removal vodokanalstroi mixture of gas-condensate wells and the reservoir fluid with high mineralization of gas and gas condensate wells.

The objective is achieved by application of the known polyvinyl alcohol - PVA - brand 18/11 for the first time for carrying out vodokanalstroi mixture that meets the criterion of novelty.

Polyvinyl alcohol - PVA - brand 18/11 produced according to GOST 10779-78 and used the crystals, as the emulsifier and medical purposes. Not toxic.

PVA is soluble in water and insoluble in hydrocarbons, chloroform and ether. PVA is produced in the form of a white or slightly yellow powder and has the following characteristics according to GOST 10779-78:

mass fraction of volatile substances,%, no more - 4,0;

- dynamic viscosity of 4% aqueous solution of the RA··103=1 5,0-20,0;

- mass fraction of acetate groups, % - 10,0-14,0;

- the indicator of the concentration of hydrogen ions (pH) 4% aqueous solution of 5,5 - 7,0.

Application of known PVA grade 18/11 for removal vodokanalstroi mixture was made possible thanks to the authors found his property lather highly mineralized water and photocontest mixture.

Research and field tests have shown that the proposed reagent can be used in aqueous solutions and in the form of solid rods.

The application of the proposed reagent to remove vodokanalstroi mixture increases its duration compared to surfactants “Progress”, which allows to reduce the frequency input of the reagent into the well, there is the effect of prolonged action PVA foaming surfactant.

The term HN liquid polymer PVA film has the properties of the corrosion inhibitor.

The number you enter in the well PVA grade 18/11 lower than surfactants “Progress”, and is determined by the operating characteristics of the wells in each case separately.

An example of a specific implementation.

In a glass pour in 200 ml vodokanalstroi mixture and the estimated number of PVA grade 18/11. The second glass instead pour PVA surfactant “Progress”. The resulting mixture is stirred separately with a mixer type Voronezh and determine the ratio of the foam.

The results are shown in tables 1 and 2.

The conditions:

temperature processing, °40

processing time, sec 60

the mixing mode, min-11200

As can be seen from the obtained data, the proposed reagent PVA grade 18/11 when foaming vodokanalstroi mixture gives a higher ratio of the foam than is known.

As can be seen from the obtained data, the proposed reagent is superior to the prototype as the ratio of foam and applied concentration (table.1), and duration of action (table.2).

Using known PVA grade 18/11 as a reagent for foaming vodokanalstroi mixture will increase the efficiency of removal is Rosie.

Sources of information

1. THE 38.10719-92.

2. GOST 10779 -78.

The use of polyvinyl alcohol brand 18/11 as a reagent for the removal vodokanalstroi mixture from the well.



 

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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.

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