SU958463A1 - Inverted emulsion drilling mud - Google Patents

Description

The invention relates to the drilling of oil and gas wells, in particular to drilling fluids on coal. hydrogen base.

A hydrocarbon-based solution containing an ester of a higher acid and a polyhydric alcohol with a number of hydroxyl groups of from two to six, for example, pentol 1, is known as an emulsifier.

The disadvantage of this solution is low heat resistance.

Also known is drilling mud containing, wt.%: Aqueous phase (saturated solution of sodium chloride or calcium chloride) 12-72, emulsifier-stabilizer (ukramin) 0.5-5.0., Filler - modified aerosil and / or soot 0.1-5.0 and the hydrocarbon phase (diesel fuel) the rest 2.

The disadvantage of this solution is its low temperature resistance, lack of stability, when barite is low, barite and clay contamination, and cost is high.

The purpose of the invention is to increase the heat resistance of the drilling fluid to 210 ° C and stability when weighting barite and contamination with clay while reducing the cost of the solution.

This goal is achieved by the fact that the solution as an emulsifier stabilizer contains emulsol (grade 3-1, or 3-2, or EX-A), and as a filler is chalk, hydrophobized with synthetic fatty acids, and the ingredients

10 taken in the following ratio, wt.%

An essential solution.

calcium chloride 24-50

Emulsol (brand

3-1, or 3-2

15

or EX-A) 6-12

Chalk, hydrophobized synthetic fatty acids 15-25

Diesel fuel - the rest

20

The solution is prepared as follows.

Emulsol and hydrophobized chalk are added to diesel fuel, and then an aqueous solution of calcium chloride is added in small portions with one time ELM by mixing the solution on a laboratory mixer at a speed of 8000 rpm. Tloche injection of an aqueous solution of calcium chloride emulsion. Stirred for another -2 hours.

thirty

The table lists the compositions and properties of the proposed drilling mud and prototype.

From the data given in the table it can be seen that the proposed inert emulsion drilling fluid has high electrical stability in the initial state and after warming up for 2 hours with and adding 45% bentonite clay and barite to a density of 1.85 g /. cm. The prototype, after heating at 210 ° C and adding 45% of bentonite, is destroyed (loses aggregative stability) and significantly reduces its stability when barite is added by barite. The solution, compared to the prototype, is cheaper due to the replacement of expensive filler Modified aerosil (9,270 rubles / ton) and emulsifier-ukramina (360 rubles / ton) are more detailed, respectively, with hydrophomed chalk (25 rubles / ton) and esulfur (80 rubles / ton). The annual economic effect from using this solution is 141.7 tac. rub.

Formula of the Invention An invert emulsion drilling fluid I containing a saturated solution of chloride, calcium, emulsifying stabilizer, "filler and lintel fuel, which has been increased in temperature stability up to 210 ° C, stability at weakening barite and contamination with clay, while reducing the cost of the solution, as emulsifier-stabilizer it contains emulsol (grade 3-1, or. 3-2, or EX-A), and as a filler - chalk, hydrophobized with synthetic fatty acids, and the ingredients up You are in the following ratio, wt.%:

Saturated solution of calcium chloride 24-50 Emulsol (brand 3-1, or 3-2,

or EX-A) 6-12

Chalk, hydrophobic synthetic fatty acids 15-25 Diesel Else

About Sources of Information

taken into account in the examination

1. USSR author's certificate W 234285, cl. From 09 K 7/02, 1967. 5 2. USSR Author's Certificate No. 697549, cl. C 09 K 7/02, 1975 (prototype).

Claims (1)

SUMMARY OF THE INVENTION An invert emulsion drilling fluid containing a saturated solution of chloride, calcium, emulsifier stabilizer, “filler and diesel fuel, characterized in that, with the goal of increasing its heat resistance to 210 ° C, stability when weighting with barite and clay contamination while reducing the cost of the solution, as an emulsifier-stabilizer it contains emulsol (grades 3-1, or. 3-2, or EX-A), and as a filler - chalk hydrophobized with synthetic fatty acids, and the ingredients are taken in the following appropriate ratio, wt.%: ·. > · * '' ‘ 24-50 6-12 15-25 Else Saturated solution of calcium chloride Emulsol (grades · 3–1, or 3-2, _ or EX-A) ⁵ Chalk, hydrophobized with synthetic fatty acids Diesel 10 Sources of information taken into account in the examination 1. USSR copyright certificate No. 234285, cl. S 09 K 7/02, 1967. 15 2. Copyright certificate of the USSR No. 697549, cl. S 09 K 7/02, 1975 (prototype).