RU2385341C2 - Lubricating additive for drilling agents - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: lubricating additive consists of higher fatty acids of natural vegetable oils, polyethyleneglycol ether of monoizononylphenol with 6-12 monomer links in radical and additionally of flotation reagent - oxal and composite silicon de-foaming agent at following ratio of components, wt %: higher fatty acids of natural vegetable oils 70-80, flotation reagent - oxal 10-15, polyethyleneglycol ether of monoizononylphenol with 6-12 monomer links in radical 9-12, composite silicon de-foaming agent 1-3.

EFFECT: upgraded lubricating properties of drilling agent, elimination of complications caused by foaming, improved process characteristics of treated solution due to total absence of foaming and achieving low values of inter-phase tension of filtrate of drilling agent at boundary with paraffinic oil.

2 tbl, 5 ex

Description

The invention relates to the drilling of oil, gas and exploration wells, and in particular to lubricating additives - lubricants of drilling fluids.

Known lubricating composition for processing drilling fluids (RU 2106381, 1998), containing natural fat mass, a neutralizing agent and an additive consisting of the following components, wt.%:

Natural Fat Mass 60-90 Neutralizing agent 2-5 Sulphonated Fish Oil 2-10 Water Rest

The specified composition is low toxic, improves the lubricating properties of the drilling fluid. However, the drilling fluid treated with the above composition has a sharp unpleasant odor and does not exclude the possibility of foaming, in addition, the mud filtrate has high interfacial tension at the border with kerosene.

Known lubricant additive for drilling fluids (RU 2148608, 2000), containing fatty acids of triglycerides with the number of carbon atoms from 14 to 24, a neutralizing agent, polyethylene glycol ether of monoisononylphenol with 6-12 monomer units in the radical and water in the following ratio of ingredients, wt.%% :

Fatty acids of triglycerides with the number of carbon atoms from 14 to 24 50-80 Neutralizing agent 3-6 Monoisononylphenol polyethylene glycol ether with 6-12 monomer units in the radical 5-30 Water Rest

However, the aforementioned lubricant additive, along with low interfacial tension at the boundary of the drilling fluid filtrate - kerosene, resistance to mineralization to saturation, has several disadvantages, such as foaming, as well as a slight decrease in the coefficient of friction and stickiness due to the significant presence of polyethylene glycols that do not have lubricating properties and availability of process water.

The technical task of the invention is to improve the lubricating properties of drilling fluids, such as the coefficient of friction at the metal-metal border, the complete absence of foaming of drilling fluids, resistance to mineralization and at the same time achieving low interfacial tension at the boundary of the mud filtrate - kerosene in order to maintain the original reservoir properties of the reservoir, environmental safety.

The problem is solved in that the lubricant additive for drilling fluids, containing higher fatty acids and polyethylene glycol ether of monoisononylphenol with 6-12 monomer units in the radical, contains higher fatty acids of natural vegetable oils and additionally contains flotation reagent-oxal and composite silicone antifoam in the following ratio of components , wt.%:

Higher fatty acids of natural vegetable oils 70-80 Flotoreagent Oxal 10-15 Monoisononylphenol Polyethylene Glycol Ether with 6-12 monomer units in the radical 9-12 Composite Silicone Antifoam 1-3

A relatively high molecular weight flotoreagent oxal is a product of dimethyldioxane production. As a component of a lubricant additive, the following brands were used: T-66, T-92 according to TU 2452-029-05766801-94. Defoamers of the DEM-VS-97, DEM-VS-94 brands according to TU 2484-012-22284995-99 were used as composite silicone antifoam.

Higher fatty acids of natural vegetable oils, individually having low values of lubricating properties and not containing water, are well combined, and in combination with other claimed components of the additive provide a synergistic effect, which is manifested in an increase in the lubricating properties of the additive compared to the well-known high-performance lubricating additives FK-2000 Plus, Glital and others. The interaction of higher fatty acids of natural vegetable oils with flotation reagent-oxal provides the additive with stabilizing properties Ghent. The interaction of flotoreagent-oxal with polyethylene glycol ether of monoisononylphenol with 6-12 monomer units in the radical provides the additive with resistance to mineralization and low interfacial tension at the boundary of the mud filtrate - kerosene. The complete absence of foaming in the drilling fluid with the inventive additive is ensured by emulsification of the interacting components: the product flotoreagent-oxal and composite silicone antifoam.

The compositions of the inventive lubricant additives "LBR-08" (examples 4-6) and known (examples 1-3) are given in table 1.

The inventive lubricant additive "LBR-08" is prepared as follows.

The calculated amount of higher fatty acids of natural vegetable oils is loaded into the reactor, the reactor is heated, for example, to 88-92 ° C, then the calculated amount of the product, flotoreagent oxal and polyethylene glycol ether of monoisononylphenol with 6-12 monomer units in the radical, is added to the reactor. The mass is stirred for 1.5 hours. Enter the calculated amount of the composite silicone antifoam and mix for an additional 1.0-1.5 hours. The finished product is pumped into a metal container with a capacity of up to 60 m ³ for cooling.

Example 1

A lubricant additive was prepared as described above from 70 g (70 wt.%) Of higher fatty acids of natural vegetable oils, 15 g (15 wt.%) Of flotoreagent-oxal T-66, 12 g (12 wt.%) Of polyethylene glycol ether of monoisononylphenol with 6 -12 monomer units in the radical and 3 g (3 wt.%) Of the complex silicone antifoam "DEM-VS-97 (see composition No. 4 in table 1).

Example 2

A lubricant additive was prepared as described above from 80 g (80 wt.%) Of higher fatty acids of natural vegetable oils, 10 g (10 wt.%) Of flotoreagent-oxal T-92, 9 g (9 wt.%) Of polyethylene glycol ether of monoisononylphenol with 6 -12 monomer units in the radical and 1 g (1 wt.%) Of the complex silicone antifoam "DEM-VS-94" (see composition No. 6 in table 1).

To evaluate the effectiveness of the inventive lubricant additives in laboratory conditions, preliminary studies have been conducted. The influence of the ratio of all the starting ingredients (composition from Table 1) of a 0.5% aqueous solution on the technological properties of the solutions was studied on standard instruments in accordance with the methodology for monitoring the parameters of drilling fluids RD 39-00147001-773-2004 (see table 2).

Lubricating properties were determined by the coefficient of friction (K _tr ) of the metal-metal pair according to the ANI (American Petroleum Institute) standard on a Baroid Mud & Lubricity Tester friction machine.

The surface tension (mN / m) of a 0.5% aqueous solution of a lubricant additive at the border with kerosene was determined by the stalagmometric method. The foaming ability of the samples of lubricant additives was evaluated in 3% aqueous solutions, mixed for 5 min with a Hamilton Beach mixer at 9500-11000 rpm. Foaming activity (P, cm ³ ) was determined as the difference between the volumes of the foamed solution after 5 min of settling (Y _p ) and the volume of the initial solution (200 cm ³ ) according to the formula: P = Y _p -200 cm ³ .

Comparative studies of the samples showed an improvement in the lubricating properties of the product in comparison with analogues, a complete absence of foaming and low surface tension of an aqueous solution of a lubricant additive at the border with kerosene. The inventive lubricant additive "LBR - 08" is compatible with all reagents and drilling fluids, including non-clay, biopolymer and silicone.

table 2
Lubricant Additive Test Results №№ K _tr pH Po cm ³ 8, mN / m T ° C one 0.06 9.6 40,0 27,2 24 2 0.06 10,2 60.0 31.8 24 3 0.08 10.6 40,0 9.7 24 four 0.05 8.2 0 8.6 24 5 0.05 8.4 0 8.9 24 6 0.04 8.7 0 9.3 24

Claims (1)

A lubricant additive for drilling fluids containing higher fatty acids and polyethylene glycol ether of monoisononylphenol with 6-12 monomer units in a radical, characterized in that it contains higher fatty acids of natural vegetable oils and additionally contains flotation reagent-oxal and a composite silicone antifoam in the following ratio of components, wt .%:
higher fatty acids of natural vegetable oils 70-80 flotoreagent oxal 10-15 monoisononylphenol polyethylene glycol ether with 6-12 monomer units in the radical 9-12 composite silicone antifoam 1-3