CS253155B1 - Plastic lubricant for core holes sinking - Google Patents

Abstract

Core grease boreholes, consists of 600 to 700 weight parts of chlorinated paraffin, 150 to 250 parts by weight of zinc oxide, 60 to 80 parts by weight of alkaline earth salts of stearic acid and 60 to 80 parts by weight of monoglyceride of rapeseed oil.

Description

BACKGROUND OF THE INVENTION The invention relates to a grease for excavating core boreholes, particularly in loss horizons, in cohesive, cracked or cracked rocks in which drilling fluid is lost. Efficient drilling with a tight drill string at high speeds in these conditions places high demands on the drill string lubrication.

A well-known core drilling technique is known in which a thin film of grease is applied to a drill string, which is partially transferred to the surface of the borehole wall during the rotation of the drill string, where it fine-pores the rock.

This stabilizes the borehole walls and prevents the loss of drilling fluid by rock absorption. Compositions based on mineral oil, thickened with soaps of higher fatty or resin acids or resinous substances, asphalts or finely ground mineral additives are used as greases for this type of core drilling.

These compositions adhere well to the surface of the drill column, and have considerable resistance to mechanical or hydraulic abrasion. Their disadvantage is, on the one hand, hygienic and water defectiveness, and, on the other hand, reduced lubricating efficiency when drilling in rocks in the presence of mineral salts.

These drawbacks are overcome by the grease according to the invention. It consists of 600 to 700 parts by weight of chlorinated paraffin, 150 to 250 parts by weight of zinc oxide, 60 to 80 parts by weight of an alkali metal salt of stearic acid and 60 to 80 parts by weight of rapeseed oil monoglyceride. The grease consistency is chosen depending on the rock.

The grease according to the invention enables efficient deep drilling with a tight drilling column at high turns in complicated drilling conditions, especially in loss horizons and also underground when drilling boreholes in confined spatial conditions.

The grease film has a high lubricating effect, adheres well to the borehole walls and is hygienically and environmentally friendly. It can therefore also be used for dredging hydrogeological wells and for drilling under conditions of groundwater threat. The grease film according to the invention also makes it possible to replace emulsion washings during drilling of wells.

By varying the concentration of the individual components of the grease, its consistency with respect to the rock material is achieved without compromising its lubrication efficiency. The film retains lubrication efficiency in water, salt solutions and organic polymers.

The effectiveness of the grease film is also increased by the appropriate selection of the corresponding drilling fluid. Examples of practical application of the invention show its applicability to various types of drilled rock or drilling technology used.

Example 1

For high-speed core drilling with a tight drilling column in the cavernous rock, a 600 grams film of grease was applied to the drilling column. parts of chlorinated paraffin, 200 wt. parts by weight of zinc oxide, 80 wt. parts of Ca stearate and 80 wt. parts of rapeseed oil monoglyceride. Water was used as the drilling fluid.

Example 2

To drill the core borehole in an unstable microtectonically disrupted rock with a tight drilling column at high turns, a 700 grams film of grease was applied to the drilling column. parts of chlorinated paraffin, 250 wt. parts by weight of zinc oxide, 70 wt. parts of Ca stearate and 70 wt. parts of rapeseed oil monoglyceride. A 5% aqueous potassium chloride solution was used as the drilling fluid.

Example 3

To drill the core borehole in the swelling rock with a tight drilling column at high turns, a 700 grease film of grease was applied to the drilling column. parts of chlorinated paraffin, 150 wt. parts by weight of zinc oxide, 60 wt. parts of Ca stearate and 60 wt. parts of rapeseed oil monoglyceride. A 3% aqueous sodium chloride solution was used as the drilling fluid.

Example 4

To drill a rectified borehole with a tight drilling column at high turns, a 650 grease film of grease was applied to the drilling column. parts of chlorinated paraffin, 200 wt. parts by weight of zinc oxide, 70 wt. parts of Ca stearate and 70 wt. parts of rapeseed oil monoglyceride. A 0.8% aqueous solution of hydroxyethylcellulose was used as the drilling fluid.

Example 5

To drill a rectified borehole in a porous rock with a tight drilling column at high turns, a 70 wt.% Film of grease was applied to the drilling column. parts of chlorinated paraffin, 200 wt. parts by weight of zinc oxide, 65 wt. parts of Ca stearate and 65 wt. parts of rapeseed oil monoglyceride. A 1% aqueous carboxymethylcellulose solution was used as the drilling fluid.

The table compares the effects of the grease film of the invention in comparison with the grease film

based lubricant KAVS. Table mineral oil, metallic soap, rosin and asphalt, referred to as Lubricant Environment Coefficient friction at torque input _2 forces in Nm 11.30 16.95 22.60 33.90 45.20 56.50 KAVS water 0.05 0.06 0.07 0.12 0.18 0.40 600 wt. parts chlorparaffin 200 wt. ZnO parts 80 wt. parts water 0.02 0.03 0.04 0.06 0.10 0.13

Ca stearate wt. parts of rapeseed oil monoglyceride

KAVS sodium carbonate solution 0.03 0.04 0.07 0.15 0.31 0.40 pH = 11

700 wt. parts of chlorparaffin 250 wt. parts ZnO 70 wt. parts of Ca stearate 70 wt. parts of rapeseed oil monoglyceride

0.03 0.04 0.05 0.08 0.11 0.15

I continue the table

Lubricant Environment _2 Coefficient of friction at inserted torque in Nm 11.30 16.95 22.60 33.90 45.20 56.50 KAVS solution 5 ta. and 0.04 0.08 0.16 0.38 0.40 0.40 KC1 600 wt. parts chlorparaffin 150 wt. ZnO parts 80 wt. parts 0.03 0.04 0.06 0.12 0.41 0.4 Ca-stearate 80 wt. parts rapeseed oil monoglyceride KAVS solution 5% Over 0.04 0.06 0.10 0.26 0.40 0.40 700 wt. parts chlorparaffin 150 wt. Parts ZnO 60 wt. parts Ca-stearate 0.03 0.04 0.05 0.08 0.12 0.33 60 wt. parts rapeseed oil monoglyceride KAVS solution 0.8% hydroxyethylcellulose 0.02 0.08 0.12 0.30 0.40 0.40 650 wt. parts chlorparaffin 200 wt. ZnO parts 70 wt. parts Ca-stearate 0.02 0.03 0.05 0.30 0.40 0.40 70 wt. parts rapeseed oil monoglyceride KAVS solution 1% carboxy- methyl cellulose 0.03 0.06 0.12 0.40 700 wt. parts chlorparaffin 200 wt. ZnO parts 65 wt. parts Ca-stearate 0.02 0.05 0.10 0.36 65 wt. parts rapeseed oil monoglyceride

253X55 continued table

Lubricant Environment -2 Coefficient of friction at inserted torque in Nm 11.30 16.95 22.60 33.90 45.20 56.50 KAVS solution 1% hydrolyzed polyacrylonitrile 0.03 0.07 0.11 0.26 - 600 wt. parts of chlorparaffin 250 wt. ZnO parts 70 game. parts of Ca stearate 70 wt. parts of rapeseed oil monoglyceride 0.02 0.03 0.08 0.19 0.38

SUBJECT OF THE INVENTION

Claims (1)

Core drill grease with a high turnover tight drill string applied to the drill string as a thin film, characterized in that it consists of 600 to 700 parts by weight of chlorinated paraffin, 150 to 250 parts by weight of zinc oxide, 60 to 80 parts by weight parts of an alkali-earth stearate salt and 60 to 80 parts by weight of rapeseed oil monoglyceride.