SU1693019A1 - Lubricating additive for clay-base drilling muds - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to oil and gas, mining and geological exploration, in particular, to drilling wells using drilling fluids. The purpose of the invention is to stabilize the conditional viscosity of a drilling fluid when a lubricant additive is introduced into it while maintaining its high lubricating properties. For this, a lubricant additive based on derivatives of high molecular weight organic acids and a liquid petroleum product as derivatives of high molecular weight organic acids and a liquid petroleum product as derivatives of high molecular weight organic acids contains corrosion inhibitors based on the triethanolamine salt of high molecular weight organic acids IK or URAL. As a liquid petroleum product, the product from the processing of bottoms from the production of butyl alcohols (KOPBS) or a polyalkylbenzene resin (PUB) or ethylbenzene styrene resin (EBS) is used, with the following mass ratio of corrosion inhibitor components: oil product 1: (2-8). In order to obtain an additive to the inhibitor, a liquid oil product is added and under normal t-re it is subjected to intensive mixing until a homogeneous mixture is obtained. The resulting additive is introduced into the drilling fluid in an amount of 0.5-3 wt.%. The viscosity of the solution remains unchanged. 3 tab. V yo

Description

FIELD OF THE INVENTION The invention relates to the oil and gas industry, mining and geological exploration, in particular, to drilling wells using drilling fluids.

The purpose of the invention is to stabilize the conditional viscosity of a drilling fluid when a lubricant additive is introduced into it while maintaining its high lubricating properties.

By stabilizing the viscosity of the drilling fluid, it is meant that when a lubricant additive is introduced into the drilling fluid, the viscosity does not increase.

Corrosion inhibitors IKB or URAL are used as derivatives of high-molecular-weight organic acids, and as a liquid petroleum product, the product of the processing of bottom residues from the production of butyl alcohols (COBPS) or PUBs or EBS at a mass ratio of corrosion inhibitor: petroleum 1: (2-8).

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The characteristic properties of the proposed additive are not determined by the specific compounds included in its composition, but only by the combination of the components in the indicated ratios.

To obtain the additive, a whole range of products are used: IKB-4, IKB-2 and IKB-GAL-M corrosion inhibitors, corrosion inhibitors, URAL-2.

As a basis, all these inhibitors contain the triethanolamine salts of high molecular weight organic acids.

As a product of processing KOPBS use two types of products, which are obtained as follows.

The first product is obtained by distilling relatively volatile components boiling up to 190 ° C under atmospheric pressure from COFSC.

The second type of product is obtained by hydrogenation of COPBS on a stationary catalyst and subsequent distillation of the hydro hemizate, the product remaining after separation from the second mixture, ethylhexanol, is the target product.

PUB is a by-product in the production of alkyl benzenes.

EBS (heavy pyrolysis resin) is a by-product of a combination (of the process of producing ethylbenzene and styrene, obtained after separating these products from the reaction mixture by rectification.

Lubricant additive is obtained as follows.

The liquid oil product is added to the corrosion inhibitor in the indicated ratio and is subjected to vigorous stirring at ordinary temperature until a homogeneous mixture is obtained. This lubricant additive is added to the drilling fluid in an amount; 0.5-3 wt.%.

Table 1 lists examples of the lubricant additive offered and a number of its characteristics.

Evaluation of lubricity is carried out by the standard method of determining the coefficient of shear crust (KSK) according to the magnitude of the relative KSK.

Conditional viscosity is assessed using standard methods. The comparison is carried out by assigning the conditional viscosity of the drill

solution with the addition of the original drilling mud to this indicator.

Increasing the corrosion inhibitor: oil product ratio greater than 8 (example 5) decreases the lubricity of the additive, while decreasing this ratio is less than 2 (example 4), the conditional viscosity of the drilling fluid increases.

The proposed lubricant additive successfully works at the most common temperatures of drilling mud (70-90 ° C).

Table 2 compares a number of indicators — the proposed lubricant additive with the known one.

The lubricant additive does not adversely affect the main parameters of the drilling fluid: filtration (F), static shear stress (SNA). The data are given in table 3.

The data of Table 2 shows that the conditional viscosity, compared to the original drilling mud, remains almost unchanged and thus eliminates

the use of expensive thinners. These results were achieved while maintaining the high lubricity of the additive. In addition, the product retains its mobility in the conditions of negative temperatures, which

Claims (1)

greatly facilitates handling and is also stable when stored for a month. Invention Lubricant additive for clay drilling muds based on derivatives of high molecular weight organic acids and liquid petroleum products, with the aim of stabilizing the conditional viscosity of the drilling mud when preservation of high lubricating properties, it contains as a derivative of high molecular weight organic acids corrosion inhibitors based on the triethanolamine salt of high molecular weight organic acids (IKB, URAL), and as an oil product is processed, butt residue from butyl alcohol production (COPPS), or polyalkylbenzene resin (PABS), or ethylbenzene styrene resin (ELS) with the following mass ratio of components of corrosion inhibitor: oil product 1: (2-8). Indicators | .The value of the indicator by example J 1 g | 3 Y 5 S J 7 J8 JS S 11 Jl2 13 | And | 15 l6 17 IS Jl9 20 The starting products are the mass ratio of the corrosion inhibitor. IKB-411111111 - IKB-2-21111 NKB-TAL-l1111 Ural-21111 Oil products: the product is processed - - KOPBS26619-666о (ABOUT product pera-W KOP6S77 772 PABOS resin, 5555 resin ELB Product Feature: relative conditional viscosity 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.1 1.1 1.0 1.0 1.1 1.1 1.0 1.0 1.0 1.1 1 1 1,0 1,0 1,1 1,1 the relative coefficient of shear of the crust 0.5k 0, Sk 0.55 0.56 0.60 0.5-0.56 0.56 0.52 0.52 0, 0.5 0.52 0.52 0.51 0.51 0, 53 0.52 0.5b 0.56, 1.ot T Indicators Known lubricant additive Relative conditional viscosity 1.8-1.9 The relative coefficient of shear crust0,52-0,56 Mobility at Mazeobraz- temperature O, C: ny production -20 Solid tabl Drilling mud on F - bentonite based clay (8%) .. Without additives 16.5 with% lubricant reagent16, 6