RU1836405C - Drilling solution - Google Patents

Abstract

Usage: drilling oil and gas wells. SUBSTANCE: drilling fluid contains, wt.%: Clay 1-10, amifol 0.003-0.150, lubricant additive DSB-4TT, barite 30-70 and other water. Amifol is a waste product from the production of nitrilotrimethylphosphonic acid neutralized with ammonia. Lubricant additive DSB-4TT - distillation residue of tall oil modified with monoethanolamine.

Description

The invention relates to the drilling of oil and gas wells, and in particular, to compositions of well-prepared solutions for drilling and opening productive formations in difficult geological conditions.

The purpose of the invention is to improve the quality of the drilling fluid by reducing its viscosity and static shear stress.

Drilling mud containing clay, barite, additive and water, as an additive additionally contains amifol-. nitrilotrimethylphosphonic acid neutralized by ammonia waste, and DSB-4TT lubricant additive as monoethanolamine-modified bottoms oil residue in the following ratio of ingredients, wt.%:

Clay

Amifol-neutralized ammonia waste

nitrile trimethylphosphon production

acid

Lubricant additive

DSB-4TT modified with monoethanolamine

VAT residue

tall oil 0.09-0.60

Barite30-70

Water Else

1-10

0.003-0.150

00 CA) O

О О ABOUT

 With

Amifol consists of ammonium salts of hydrochloric, phosphorous, nitrilotrimethylphosphonic and methyliminodimethylphosphonic acids. It is known as a component of the composition for isolating formations (3), in its properties it complies with the requirements of TU 6-09-20-157-89, and is produced by the Novocheboksersky Chemical Plant. Its use in insulating compositions is based on the fact that amifol reduces the retention time in burning mixtures with the introduction of m in an amount of not more than 0.01%. Its use in drilling fluids is unknown, because amifol is a flocculant for clay barite m.

DSB-4TT stands for Drilling Fluid Additive Lubricant, developed by BashNII NP, and is produced by the Institute’s pilot plant in accordance with TU 38.401-66-56-90. DSB-4TG is a monoethanolamine-modified tall oil residue. The use of DSB-4TT reagent as a component of the drilling fluid is unknown, because this reagent is a flocculant for barite.

By introducing a composition of amifol and DSB-4TT, the relative viscosity is reduced to 50 s and SSS to zero. This viscosity is typical for clay drilling fluids, on which productive formations are usually opened at a density of 1.18-1. 25 g / cm3, and therefore, we have adopted in this work as the limit that should have been achieved when introducing reagents into the drilling fluid, the mixture of which is used as an additive in the present solution.

When barite is introduced into the drilling fluid to a density of 2-2.2 g / cm3, the conditional viscosity rises sharply to several hundred seconds, the solution becomes uncleanable and sedimentation but unstable. To reduce the viscosity and the value of CHS to zero while maintaining sedimentation stability, a composition of their amifo and DSB-4TT is introduced.

In practice, the solution is prepared in the following order: first, a solution of amifol and DSB-4TT is prepared, they dissolve within a few minutes. Then, clay and barite are added to this solution by weight and mixed thoroughly with a stirrer. The amount of reagents is calculated on the dry matter, based on its content in the commercial product according to the passport: 30% for DSB-4TT and 75% for amifol,

Example 1. 0.004 g (0.003%) of amifol 0.3 g (0.09%) of DSB-4TT was dissolved in 69 ml of water. 1 g of clay and 30 g of barite are added.

Thoroughly mix and measure the parameters:

UV / s16

Density, g / cm1.31

SNA, dPaO / O

When heated and in a centrifuge, the daily sediment,% 0, does not separate.

Example 2. 0.0133 g (0.010%) of amifole and 1.2 g (0.4%) of DSB-4TT are dissolved in 44.6 water. 5 g of clay and 50 g of barite are introduced into the solution, mix thoroughly and measure the parameters:

Density, g / cm31.52

Conditional viscosity, s24

SNA, dPaO / O

When heated and centrifuged, do not separate, daily sediment,% 0.

Example 3B: 29.35 ml of water was dissolved with 0.2 g (0.15%) of amifole and 2.0 g (0.6%) of DSB-4TT reagent. Then 10 g of clay and 70 g of barite are introduced, mix thoroughly and measure the parameters:

Density, g / cm32L9

Conditional viscosity, s52

SNA, dPaO / O

Daily sediment,% O

It does not separate when heated and centrifuged.

Other examples are given in the table. They suggest that the proposed drilling fluids have a higher sedimentation stability, lower viscosity and static shear.

The developed drilling fluid is technologically advanced (the components are not scarce, environmentally friendly, highly soluble in water and compatible with other reagents) and makes it possible to avoid sticking, emergency situations and premature opening of the formation.

Claims (1)

SUMMARY OF THE INVENTION A drilling fluid containing clay, barite, additive and water, characterized in that, in order to improve its quality by reducing its viscosity and static shear stress, it additionally contains amifol neutralized by ammonia from the production of nitrilotrimethylphosphonic acid, and as an additive - a lubricant additive DSB-4TT - modified monoethane-bottoms of tall oil residue in the following ratio of ingredients, May,%: Clay1-10 Amifol - neutralized by ammonia waste of nitrile trimethylphosphonic acid production 0.003-0.150