SU1384594A1 - Agent for drilling fluids - Google Patents

Abstract

The invention relates to the drilling of oil and gas wells and is intended to flush the wellbore. The purpose of the invention is to increase the inhibitory properties of the drilling fluid; The reagent contains the following ingredients. at their ratio, wt.%: water 100, asbestos 10.0-25.0, lignosulfonate 2.0-5.0, hydroxide and / or sodium aluminate 0.2-0.5. Sodium hydroxide and / or sodium aluminate is used as an alkaline agent. The reagent is prepared by dissolving asbestos in water, followed by the introduction of other incoming ingredients with constant mixing. The reagent makes it possible to increase the stability of clay samples and, consequently, on the borehole wall. dispersed phase with a dispersion medium 2 tabLo i (L C

Description

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The invention relates to the drilling of oil and gas wells, in particular to the drilling of a wellbore.

The purpose of the invention is to increase the inhibitory properties of the drilling fluid.

The reagent for drilling fluids includes lignosulfonate, asbestos, hydroxide and / or sodium aluminate and water in the following ratio of components, May „h.

Water 100.0.

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rub and / or

aluminum at

sodium 0,2-0,5

Asbestos10.0-25.0

Lignosulfonate reagent 2,, 0

To prepare the reagent, the following are used: asbestos 6, 7th grade; Sodium aluminate is a solid gray powder or liquid with a density of 1.3-1.4 g / cm, containing 180-260 g / l of sodium hydroxide, pH 11-12, modulus, 8i Condensed sulfite-alcohol is used as lignosulfonate reagents. Bard (KCC of various grades or ferrochromium sulfonate reagent (FHLS)

Table 1 shows the proposed reagent formulations

Table 2 shows the technological parameters of drilling fluids treated with these reagents.

The invention is illustrated by the following examples.

Take pi. 0.3 g of sodium hydroxide is dissolved in 100 g of water, 15 g of asbestos of the 6th grade are added and mixed thoroughly for 10 minutes on a Voronezh type mixer.

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(7,600 rpm). After that, 3 g of KBSB-2 are added and mixed until a homogeneous mass is obtained.

As can be seen from the presented data, the reagent significantly increases (up to 2 times) the stability of clay samples, and hence the well wall. This effect is due to the fact that during the treatment of asbestos with weakly alkaline solutions of sodium aluminate hydroxide from its surface in the first 10-20 minutes Silica-oxygen compounds are intensively dissolved and silica gel accumulates in the solution, which is stabilized by a lignosulfonate reagent. Increasing the asbestos treatment time with a weakly alkaline solution does not increase the degree of dissociation of the silica-oxygen layers. At the same time, a brucite layer is formed on the asbestos surface, on which lignosulfonates condense, which increase the bond between the dispersed phase (asbestos) and the dispersion medium.

Claims (1)

Invention Formula 0 0 five 0 Reagent for drilling fluids, including lignosulfonate, asbestos, alkaline agent and water, characterized in that, in order to increase the inhibitory properties of the mud, sodium hydroxide and / or sodium aluminate are used as alkaline agent in the following ratio of ingredients, wt. Water Asbestos Ligiosulfonate Gndroksid and / or sodium aluminate 100 10.0-25.0 2.0-5.0 0.2-ol5 45 Table 1  7th grade asbestos used sodium aluminate as alkaline agent T a b l n c a 2 Mud type Reagent Isa Sz   :: 10Z atr 1 2 3 -A 6 7 eight 3 7 to ten ten five ten ten ten 10 10 Prolo Table 1 table Resistance of clay sample h ABOUT 0.3 1.2 1.8 1.0 1.0 1.0 2.0 0.6 3.0 ABOUT about 10 7 0.55 1.55 1.05 2.0 " 2.04 0.52 O30 1,010 3.0 0.8 12 7 five five five five five 3 12 II W, o; 4.0 5.0 6.0 7.5 7.5 7.5 8.0 4.0 8.5 8.5 Continuation of table 2