SU1379303A1 - Washing fluid - Google Patents

Description

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The invention relates to the drilling of wells, namely to compositions used for flushing a well.

The purpose of the invention is to increase the lubricating and anti-wear properties while reducing the corrosion ability.

The goal is achieved by the proposed composition consisting of water and 4-methyl-D-phenyl-1,3-dioxane (MD), which is the final product of the synthesis of oi-methylstyrene with formaldehyde and has the empirical formula C, H, H, 402, and the structural formula

CH,

H - C - SNg - C -

About - CHj - About

Prepare a solution by mixing the ingredients.

Primer p. To prepare 1000 g of a solution containing 0.2 wt.% MD, to 2.1 g of the latter (marketable product is a solution of 95% concentration) 897.9 g of water are added and stirred.

Similarly, various types of flushing fluid are prepared with a content of lubricant additive. Antiwear and lubricating properties are determined on a standard friction machine and a known installation. Corrosion properties are determined by the gravimetric method.

The degree of protection (SZ) of corrosion inhibitors (the ability of the inhibitor to protect steel from corrosion) is determined by the formula

NW -b-i-l i-. 100 (%),

K f

where K is the corrosion rate of steel in

aggressive environment without inhibitor; Kj - corrosion rate of steel in

The same medium, but additionally containing a corrosion inhibitor. Antiwear and lubricants for preparing hydrosulphuric washing liquids containing water in tap water, dissolving PD and LP, are given in Table. 2,

hydrogen sulfide gas at a concentration of 200 mg / l.

The content of hydrogen sulfide in the washing liquid during corrosion testing is monitored by iodometric titration and maintained at the proposed level.

A solution of hydrogen sulfide in water (hydrogen sulfide water CB) is an aggressive liquid, leading to intense corrosion of the metal and reducing its performance. The presence of hydrogen sulfide in the washing liquid leads to a decrease in wear resistance of the roller cone bits six times.

From the results of experimental studies, it follows that the anticorrosive properties of washing liquids with the addition of MD are higher than with the addition of 4-phenyl-1,3-dioxane (PD) and sodium metal sulfonate (MAC). Much better and antiwear properties of these solutions.

Anticorrosive properties of drilling fluids with PD and MD are presented in table. one.

Table 1

Antiwear properties and lubricating properties of MD for different

Table 2

intensity load x 3 table.3.

Table

0.19

0.2

0.24

0.3

Wednesday

The ratio of the rate of wear steel,, to the coefficient of friction at intensity, And / mn

100

SV + 0.8% MD

2.0

Claims (1)

As follows from the data given in table. 3, the goal is achieved when the concentration of MD, equal to 0.1-0.4%. 20 claims Wash fluid containing a lubricant dioxane additive and water, wherein 25, in order to remove the lubricant Continuation of table 3 200 T 300 I 400 and anti-wear properties while reducing the corrosion ability, it contains 4-methyl-4-phenyl-1,3-dioxane as a lubricant dioxane additive in the following ratio of ingredients, in%: 4-methyl-4-phenyl-1, 3-dioxane 0.1-0.4 Water Else