SU734243A1 - Drilling mud - Google Patents

Description

The present invention relates to the field of drilling oil and gas wells, in particular, to drilling fluids used in drilling wells in difficult geological conditions. Known non-dispersive drilling mud for oil and gas wells, containing 8% commercial polyacrylamide, CSSC, fuel oil or oil, chalk and water 1. The disadvantages of this solution are the loss of flocculating properties and enrichment of drilled rock during drilling, the absence of crepe properties. The drilling pacTBopj-containing stabilizer reagent, calcium hydroxide, electrolytes, and water 2 are known. The drawbacks of this drill bit are the high alumina capacity of the system and, as a consequence, the high consumption of chemical reagents to improve the quality of the mud. The purpose of the present invention is to increase the quality of the solution by preventing dispersions of either clay particles and flocculation of the drill cuttings. This goal is achieved with a solution containing a polymer stabilizer reagent, electrolytes, water, and the solution contains iron hydroxide as a metal hydroxide, the components being contained in the following ratio, wt%: Polymeon reagent stabilizer. 1-15 Electrolytes1-5 Iron hydroxide 1-10 WaterOther. The drilling fluid also contains a lubricant additive, for example, oil or smad in the amount of 1-15 wt.%. The electrolyte solution contains sodium chloride or potassium, sodium hydroxide or potassium hydroxide. This drilling mud can be used when penetrating highly colloidal clay and crumbling sediments. Iron hydroxide in this solution ensures the stability of the borehole walls. Tables 1 and 2 show the compositions of the solutions and the results of their tests.

Table 1

one . 1.04 2453 / 18O

2 1.00 - 215 O / O

3 1,02 22 5 О / О

4 1,00 20 7 О / О

table 2

clay powder

durable durable not precipitated

clay powder

hard hard fell out after 18 hours

clay powder

hard hard partially dropped

clay powder

hard hard 5 hours precipitated

5 1.04 34 8 14/20 O

6 1,00 27 7 О / О

The clay powder was added in weight percent of the total volume of the mixture. Each mixture was stirred for 2 hours on a high-speed mixer (600 rpm), after which the technological and structural-mechanical properties were measured and the mixture was set for stability and daily sludge.

The fixing properties were checked by immersing the mudstone of argillite core in the filtrate, by the destruction force of which under the hydraulic press its relative stability was determined. Core samples, spilled into the mud filtrate,

clay powder

durable, prosh. did not precipitate

clay powder

durable, durable,. precipitated after 7 hours

containing potassium chloride and the same oxide., not destroyed.

The introduction of the solution will allow to increase the drilling rate, durability of the drilling and rock-breaking tools and elements of the circulation system, to ensure trouble-free wiring of oil and gas wells.

Claims (2)

Invention Formula 1, A drilling fluid containing polymer reagent-stabilizer, electrolytes, metal hydroxide and 6/734 differs with the fact that, in order to improve the quality of the solution, by reducing the dispersion of clay particles while simultaneously cutting the drilled rocks as metal hydroxide the solution contains iron hydroxide, in the following ratio of components (in wt.%): Polymer reagent stabilizer 1-15 Electrolytes 1-5 Iron hydroxide 1-10 Water The rest. "2. The drilling fluid in accordance with claim 1, clause 1, tl and h, and so that, in order to ensure the lubricating properties of solution 8, it contains a lubricant additive, for example oil or smad. 3. The drilling fluid according to claims 1 and 2, characterized in that the solution contains potassium or sodium chloride, potassium or sodium hydroxide as electrolytes. Sources of information taken into account in the examination. 1. Kulagin P.G. Interim guidance on the preparation and maintenance of properties of polyacrylamide-based flushing fluid to dissect productive formations. Kharkiv, 1966. SLO-15. 2. Kister E, G, Chemical treatment of drilling fluids ,. M., Nedra, 1972, p.344-348 (prototype).