SU1033524A1 - Drilling mud - Google Patents

Abstract

BORING SOLUTION containing clay, potassium chloride, lime, lignite material and water / characterized in that, in order to improve the quality of the drilling fluid by increasing its inhibiting properties, it additionally contains a product of alkaline hydrolysis of polyacrylonitrile, and contains carbon alkaline reagent as a lignite material with the following ratio of components, - weight. %: 3-15 Clay Chloride C2-10 or 0.5-2 Lime Carbonic Alkaline, 5-2 Reagent Alkaline Hydrolysis Product of Poly (/) 0.5-2 Acrylonitrile Remaining Water

Description

The invention relates to a boil of oil and gas wells; Particulars to drilling fluids used in drilling in complicated conditions. Drilling fluids are known for drilling in difficult conditions, the inhibition effect of which is provided by lime G b The disadvantage of these drilling fluids P9B is a low inhibitory level due to low solubility of lime. A drilling mud containing clay, potassium chloride, lime, a lignite material, and water 2 is known. The disadvantage of this solution is a low level of inhibition under difficult drilling conditions. This is due to the fact that lignite materials provide small values of water yield only with a very low content of potassium ions in solution (not more than 0.5-0.8%). When the content of ions is in solution, providing a high level of inhibition (when the content of ions Potassium more than 0.8% of the solution has high water return values (more than 40 cm / 30 min. The aim of the invention is to improve the quality of the drilling fluid by increasing its inhibitory properties. The goal is achieved by drilling mud containing clay, potassium chloride, lime , lignite material and water, additionally contains alkaline hydrolysis product of polyacrylonitrile, and as lignite material contains carbon alkaline reagent in the following ratio of components, wt.% Chloride ca2-10 or 0.5-2 Lime Carbon alkali reagent Alkaline hydrolysis product of poly0, 5- 2 Acrylonitrile Water Else When testing a kalyno-limestone solution, a carbon-alkaline reagent produced by domestic industry according to TU 39-01-247-76 is used as a lignite material; as the product of alkaline hydrolysis of polyacrylonitrile is hypan according to TU 6-01-166-74 and prepared in laboratory conditions the product of hydrolysis of powdered polyacrylonitrile or the product of hydrolysis of tissue waste from the fiber Nitron with a ratio of polyacrylonitrile with an alkali of 1: 0.7. Studies have shown that in the system of this drilling fluid. The applied samples of the products of polyacrylonitrile hydrolysis are identical. New potash-lime drilling mud was tested in laboratory conditions. The solution was prepared by alternately introducing the components into the aqueous suspension of the clay material, followed by stirring the mixture using a laboratory stirrer at 3000 rpm. To prepare 1000 g of the solution, 790 g of water and 100 g of bentonite are taken. The mixture is stirred for 2 hours, after which 60 g of potassium chloride, 20 g of lime, 15 g of alkaline hydrolysis product of polyacrylonitrile and 15 g of lignite material (UShR) are introduced. The mixture is stirred for 3 hours, after which the values of the solution are measured. The compositions of the studied solutions and their indicators are given in table.1. For comparative data, laboratory work was carried out on a known solution on domestic raw materials. The data presented in Table. 2. From Table 1, it can be seen that the quantity of the alkaline hydrolysis product of polyacrylonitrile or its derivatives is in the range of 0.5-2 wt.%. When the content of the product of alkaline hydrolysis of polyacrylonitrile or its derivatives in the amount of; less than 0.5% by weight of their effect does not appear. So, when its content is in the amount of 0.3, despite a relatively large amount of potassium chloride (6 wt.%), Lime (1.5 wt.% And lignite material (1.5 wt.%), Water loss of the solution equals 18 cm 30 min, and the resistance coefficient is 74%. With an increase in the content of the products of hydrolysis of polyacrylonitrile to 0.5 wt.%, the water loss, ceteris paribus, reaches 9 cm / 30 min, and the resistance coefficient is up to 85%. the product of alkaline hydrolysis of polyacrylonitrile 2 wt.%, the water loss of the solution is reduced to 4 minutes, and With a further increase in the content of the alkaline hydrolysis product of polyacrylonitrile, there is no decrease in water loss and an increase in the stability of the mudstone, which indicates that it is not appropriate to further increase the reagent content in the drilling mud. The optimum amount of lignified material in the drilling fluid is within 0.5 -2 wt.%, Since its content is less than 0.5 wt.%, The effect of the lignite material is not yet manifested, and the solution yield is at a level of 19 minutes, and the coefficient of resistance willow - 76%. The increase in the content of lignite material in excess of 2 wt.% Is impractical because it does not significantly reduce the water loss and increase the stability coefficient of the mudstones. Maintaining a potassium chloride content in the range of less than 2 wt.% Is impractical because of the low stability coefficient of the argillite. The maximum level of the coefficient. The stability of argillite is observed when the content of potassium chloride is 10 wt.%. An increase in the content of potassium chloride in excess of 10% by weight is inappropriate, since no increase in inhibitory effect is observed. The minimum quantity1 of lime at which its effect begins to appear is in the amount of 0.5 wt.%. With its content in the amount of 0.3 wt.%, The water loss is still at the level of 12 cm-30 minutes. When the content of lime in the amount of 0.5 wt.%, There is a sharp decrease in water loss to 7 minutes, and when its content is 2 wt.% - to 4-5 cm- / 30 min. Increasing the lime content in excess of 2 wt.% Is impractical because it does not significantly improve the quality of the drilling fluid.

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Claims (1)

A DRILLING Mud containing clay, potassium chloride, lime, lignite material and water, characterized in that, in order to improve the quality of the drilling fluid by increasing its inhibitory properties, it additionally contains the product of alkaline hydrolysis of polyacrylonitrile, and as a lignite material contains alkaline carbon reagent in the following ratio of components, weight. %: Clay 3-15 Chloride lia 2-10 Lime . 0.5-2 Carbon alkali reagent 0.5-2 Product guide poly acrylonitrile 0.5-2 Water Rest yes SU in 1033524>