RU1794946C - Hyper-heavy drilling fluid - Google Patents

Description

common components are hydroxides and oxychlorides of magnesium.

This composition of the drilling fluid and the technology for its preparation has the following disadvantages: limited temperature range (15 ... 25 ° C) making it difficult to prepare the solution at low and negative temperatures; the impossibility of making it earlier than a day after the start of cooking; high cost. The purpose of the invention is the creation of a drilling fluid containing starch, a structure-forming additive, barite and an aqueous solution of salt, which would have a lower cost compared to the prototype while simplifying the technology of its preparation, if desired, to a density of 2800 kg / m3.

This goal is achieved in that as a dispersion medium of the drilling fluid, an ammoniated calcium nitrate solution is used according to TU 113-03-22-01-87, and as a structure-forming additive is a by-product of the production of dimethyldioxane in the production of isoprene from isobutylene and formaldehyde in the following ratio of components , wt.%: Starch 0.1-0.2 A by-product of the production of dimethyldioxane in the production of isoprene from isobutylene and formaldehyde 0.2-0.7 Barite 65.0-72.0 Ammonized solution

calcium nitrate Else Preparation of the solution is as follows.

With vigorous stirring or through a hydraulic funnel in ammonia

a calculated amount of starch is added to the calcium nitrate solution. After complete dissolution, a by-product of dimethyldioxane production is introduced upon receipt.

isoprene from isobutylene and formaldehyde (reagent T-80) and iron.

In order to obtain a super-desired drilling fluid, three mixtures of ingredients were prepared containing each (in

wt.%) the following components.

Composition 1. Ammonized solution of calcium nitrate 34.1; modified starch 0.2; byproduct

the production of dimethyldioxane in the production of isoprene from isobutylene and formaldehyde (reagent T-80) 0.7; barite 65.0,

Composition 2. Ammonized solution of calcium nitrate 31.0; modified starch 0.15; reagent T-80 0.45; barite

68.4.

Composition 3. Ammonized solution of calcium nitrate 27.7; modified starch 0.1; reagent T-80 0.2; barite 72.0.

The resulting composition of the drilling fluid had the following process parameters presented in table 1.

As can be seen from table 1, the claimed composition of the drilling fluid has acceptable technological parameters, its density can be increased to 2800 kg / m3 using medium-weight material, for example barite, which avoids the use of expensive, scarce and environmentally harmful high dense wishers - lead and glandular-iron ore concentrates.

The claimed composition is characterized by a lower (compared to the prototype) cost (see; Table 2) and a reduction in the time required to prepare (see Table 3).

SUMMARY OF THE INVENTION A super-desired drilling fluid comprising starch, a structure-forming additive, barite and an aqueous solution of mineral salt, characterized in that, in order to reduce its cost while simplifying the technology of its preparation, if desired, to 2800 kg / m3, it is a structure-forming the additive contains a by-product of the production of dimethyldioxane in the production of isoprene from isobutylene and formaldehyde, and as an aqueous solution of a mineral salt, an ammoniated aqueous solution

calcium nitrate in the following ratio of ingredients, wt.%;

Starch 0.1-0.2 A by-product of the production of dimethyldioxane in the production of isoprene from isobutylene and formaldehyde 0.2-0.7. Barite 65-72 Ammonisiro. bath solution of calcium nitrate

Table 1

table 2

Table 3