SU1263705A1 - Hydrocarbon-base drilling mud - Google Patents

Abstract

Hydrocarbon based drilling solution, inclusions of highly oxidized bitumen, synthetic fatty carboxylic acids, a structurant, an additive and an additive, which, in order to increase the aggregative stability at elevated temperatures, contains polyorganoalkoxysilanes and siloxanes (POASS) and sodium hydroxide, and clay powder as a builder in the following ratio of ingredients, wt.%: Hydrocarbon base 34.0-75.0 Highly oxidized bitumen 10.0-17.0 Synthetic fatty 0 , 5-3.0 carboxylic acids 1.0-10.0 Clay powder 3.0-8-8 POASS based on the amount of sg clay powder (L 0.1-0.2 Sodium hydroxide based on the amount of POASS Ug water Remain Od

Description

The invention relates to the drilling of oil and gas wells, in particular to flushing fluids, used in the drilling of oil and gas wells. The purpose of the invention is to increase the aggregative stability at elevated temperatures. Polyorganoalkoxysilanes and siloxins (POASS) are introduced in a weakly alkaline medium in an amount of 3-8% of the amount of clay powder. In an alkaline medium, the hydrolytic polycondensation of POACS takes place with the formation of highly molecular organometallic polymers of regular structure, which are water-repellent agents of clay mud. The technology for preparing hydrocarbon based wet mud is as follows. A hydrocarbon dispersion medium heated to 70-80 ° C is poured into the mixing mechanism, then highly oxidized bitumen, synthetic fatty acids and sodium hydroxide are introduced at intervals of 15 minutes, then clay powder, polyorganoalkoxy (propoxy) silane-siloxanes and sodium hydroxide (0.001 of the POESS amount). After 20 minutes, they are added to the desired density. The preparation of the solution is carried out in one stage, continuously, the total preparation time is 1 hour. The physicochemical parameters of drilling solutions are listed in the table. Example 1. A hydrocarbon-based solution (CBR) was prepared under laboratory conditions in the following ratio of components, wt.%: Diesel fuel 52.85 High-oxidized bitumen 13 Synthetic fatty acids (FFA) of fractions BW 25 ° C, Pf.roxid sodium Bentonitic Bitumen powder - polyorganethoxysilanes-siloxanes (POESS) 5 of the quantity of clay powder Hydroxydrylate 0.1 of the quantity of POESS Ut wish agent - barite Pour the estimated amount of the preheated diesel engine to 70 C into the laboratory stirrer of a milling jet fuel and bitumen pour vysokoskislenny. Mixing time 15 min. Then the required amount of synthetic fatty acids of fraction Cb and sodium hydroxide are added to saponify them. After the mixture has been stirred for 10 minutes, bentonite clay powder, POESS water repellent, sodium hydroxide (for creating an alkaline medium during POESS hydrolytic polycondensation) are added to the mixer, then, after 15 minutes, the barber is added to the mixer. The total preparation time of CBR is 60-70 minutes. The prepared solution has the following parameters: density 1.19 conditional viscosity 138 s; static shear stress 168/315 filtration O „„ stability 30 min O the initial parameters are measured 10 hours after the preparation of the solution. The prepared solution is subjected to heat treatment in a laboratory autoclave at a pressure of 300 atm. The burden of the thermostatting cycle is 2 hours, the number of thermostatting cycles is 3. The parameters of the solution after heat treatment did not change significantly as compared to the initial ones, the solution remained stable with zero filtration. The main indicator of the amount of solution is the value of stability after heat treatment. Example 2. A hydrocarbon-based hydrocarbon-based drilling fluid prepared in the laboratory as described in example 1 of the technology has the following composition, wt.%: Diesel fuel 54.2 High-oxidized bitumen 13, 6 Synthetic fatty acids of С fraction Sodium hydroxide Bentonitic clay powder 1.0 Water-repellent POESS 3 from the amount of clay powder 0.1 from the sodium hydroxide amount of POESS The prepared solution has the following parameters: density 1.20 g / cm; conditional viscosity 46 s; static shear stress -; filtration 0.3 -j 150/290 Parameters of the solution after heat treatment at 170 ° C: conditional for 21 s; static shear stress mg, cm s filtering 0.5 go stability value of 0.02 g / cm . Thus, at the lowest concentration of water-repellent agent (POESS) - 3% - incomplete hydrophobic zinc powder occurs, due to which the thermal stability of the drilling fluid decreases. At concentration. POESS below 3% parameters of an enhanced hydrocarbon-based drilling mud become unsatisfactory, structural mechanical parameters (conditional stress on viscosity, shear) are low and the solution cannot withstand heat treatment 120-130 ° C unsuitable for drilling deep wells with high reservoir rates. Example 3. Utilized drilling solution prepared according to the same technology as in example 1, has the following composition, wt.%: Diesel fuel High oxidized bitumen Synthetic fatty acids of fraction C - C Sodium hydroxide Bentonitic clay powder POESS f 8 from the amount of clay powder Sodium hydroxide O, 1 from the amount of POESS 26.85 The parameters of the initial solution are as follows: density 1.19 g / cm; conditional viscosity 200 s; static nasstatic displacement 305/650 filter cm o / 30 min. After thermostating, the solution has the following parameters: conditional viscosity 123 with static mg shear stress 132/262 cm filtration O p stability 30 min Og / cm. At a concentration of more than 8% of the water repellent, the clay powder becomes so organophilic that the structural and mechanical properties of the solution become too high and remain so even after heat treatment; such a solution is difficult to pump, i.e. does not satisfy technological parameters. The properties of the proposed RUS maintain high stability with multiple thermal effects (heating-cooling), which allows using this solution under conditions of high reservoir temperatures when drilling deep wells. The solution is stable in time, does not require additional processing while drilling. L & fiiL

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Claims (2)

DRILLING DRILL on a hydrocarbon * base, including highly oxidized bitumen, synthetic fatty carboxylic acids, structure-forming agent, weighting agent and additive, carboxylic acids POASC clay powder Sodium hydroxide 0.5-3.0 1.0-10.0 3.0-8.0 _β of the amount & clay powder 0.1-0.2 of the amount of POASS Weighting compound Rest N) Od • h o w>