SU619500A1 - Method of preparing drilling mud - Google Patents

Description

The invention relates to methods for the preparation of drilling fluids, and can also be used for preparing tampon solutions.

It can be applied in the oil and gas, exploration, construction, etc., and industries.

There is a known method of preparing a drilling fluid by adding caldinite or caustic soda, in which the clay powder is activated and the pH of the dispersion medium is raised.

Its disadvantage is an increase in the total concentration of electrolyte ions in the drilling mud (salt + alkali injected) and, as a result, higher values of viscosity and fluid loss of the drilling mud.

A known method of treating a drilling fluid is by acting on it with an electric field, which consists in polarizing the drilling fluid in the field of a point negative electrode.

The disadvantage of this method is that it cannot be used in

a solution preparation process for electrically activating its components. The elimination of the pre-electrical activation of the clay powder and water causes an increase in viscosity and water (the yield of the drilling fluid.

The purpose of the invention is to reduce the viscosity and yield of the solution while simultaneously reducing the costs of chemicals.

This is achieved by the fact that in a known method of preparing a drilling fluid by dispersing in water clay parts previously activated in the corona discharge zone of the negative electrode, water is electrolyzed and taken from the negative electrode zone after its pH reaches 14, and the mud powder is introduced into the water in no more than 8-10 minutes.

PRI me R. The solution is prepared in the following manner.

To obtain the dispersion medium of the drilling fluid, a laboratory electrolysis rod is used.

The water used in the experiment contains the following quantities of role ions, g / l:

.-

every 0.1556

-i

ISO

3 0.1556

so; ZDZO5

From 0.3407

M 0.1797 Na 1.5925 Total; 655O4 g / l

The voltage on the X-2 electrolysis electrodes is determined by the shot from the dependence

U.K-I-,

where and is the voltage across the electrolysis electrodes (B),

K - proportionality coefficient € - relative dielectric constant of water,

X - specific electrical conductivity of water Ohm.

The voltage on the eleletrolia electrodes is 533 V, since the dielectric of the saline water is 80 with a fixed electrical conductivity of OD5 Ohm cm. Water contains Nd, K,., Mg- chlorides, as well as Ce, Mgf sulfites. The process of obtaining alkaline water from the zone of the negative electrode in the X-2 electrolyzer is continuous with a flow rate of 0.2 l / mvn.

Dipersion medium from electrolyte with pH 4 is collected in a vessel for 3-4 minutes, and then with non-fermenty mixing with a mechanical stirrer, hl oporoshka, previously sifted through a metal grid with DI, is introduced into it. The amstrom cell is 1 mm, mounted on insulators and connected to the NOM circuit. At the high-voltage source pole (25 kV), the positive pole of which is grounded.

The magnitude of the time interval by the end of the electrotreatment of water in the electrolyzer and the beginning of the introduction of the clay powder into it is due to the speed of the recitation processes in the water occurring after the electrolyzer.

An excessive amount of hydroxyl groups, with which the water is saturated immediately after treatment, is recombined by the reaction

40H - 2H20-02- + 4e;

those. As a result of this reaction, some of the beneficial properties acquired by water during the electrotreatment process are lost.

The recombination process proceeds at a rate dependent on the thermodynamic state of the system.

It was established experimentally that it is only possible to use the effect of the presence of free hydrosil groups in water only if clay powder is introduced into the water no later than 8-10 minutes after it leaves the electrolyzer.

Claims (1)

This time gap is valid for any possible combination of thermodynamic conditions encountered in practice. Invention Formula The method of preparing the drilling fluid by dispersing in water clay particles preactivated in the corona discharge zone of the negative electrode, characterized in that, in order to reduce the viscosity and fluid loss of the solution while reducing the costs of chemicals, water is electrolyzed and taken from the negative electrodes after its pH reaches 1.4, and the mud powder is introduced into the water in no more than 8-10 minutes.