Lubricating additive for water-based drilling fluids

FIELD: oil and gas production.

SUBSTANCE: invention relates to drilling fluids used when boring oil and gas wells. Lubricating additive contains 10-30% tall oil, 15-20% polyglycols, 40-50% oxal flotation reagent, and 15-20% beet molasses.

EFFECT: increased stabilizing, lubricating, and antiwear properties of drilling fluid.

2 tbl, 2 ex

 

The invention relates to the field of drilling oil and gas wells, particularly to lubricant additives for drilling muds water-based.

Known lubricating additive for drilling fluid water-based (RF Patent No. 2142978)containing a light taly oil, as well as modifying additives - polyglycol in the following ratio of ingredients, wt.%:

easy tall oil40-60
polyglycol40-60

By virtue of the known lubricant additives is easy to obtain, which is carried out by simple mixing of the starting components. At the same time, this lubricating additive has the following disadvantages:

1) low lubricating and anti-wear properties of the mud, especially at high specific loads;

2) high foaming ability, causing the need for processing drilling mud by defoamers;

3) low-stabilizing properties, which manifests itself in maintaining or increasing the rate of filtration of the drilling fluid after processing lubricant additive.

Closest to the claimed invention, the technical solution is a lubricant additive according to patent No. 2170243 having name DRC-TMP, which contains a salt of monoethanolamine is crude tall oil, oxal or polyglycols, and toluene in the following ratio, wt.%:

salt of monoethanolamine and raw
tall oil10-12
toluene5-20
oxal or polyglycolsrest

Supplement is recommended to introduce in the drilling fluid in the amount of 0.5÷1.5% of the volume of the treated solution.

The disadvantages of lubricant additives DRC-TMP are:

1) low lubricating and anti-wear properties of the mud, especially at high specific loads;

2) high foaming ability, causing the need for processing drilling mud by defoamers;

3) low-stabilizing properties, which manifests itself in maintaining or increasing the rate of filtration of the drilling fluid after processing lubricant additive;

Object of the present invention is to improve stability, lubrication, and wear of the drilling fluid, as well as preventing it foaming.

This task is solved in that the lubricating additive for drilling fluid is water-based, containing crude tall oil, polyglycols, flotation-oxal, according to the invention, further comprises chalk is su beet in the following ratio of components, wt.%:

crude tall oil10-30
polyglycols15-20
flotation-oxal40-50
molasses beet15-20

We offer lubricating additive prepared by mixing the listed components in the specified proportions at a temperature of 65÷95°and subsequent stirring for 2.5÷3 hours.

As part of the proposed lubricant additives are used:

crude tall oil (TU 2453-001-00279143-94);

- flotation-oxal (TU 2452-029-05766801-94);

- polyglycols (TU 3830214-88);

- molasses beet (GOST 30561-98).

We offer lubricating additive is introduced into the drilling fluid is water-based in the amount of 0.5÷2% of its volume.

Preparation of the proposed lubricant additives is illustrated by the following examples.

Example 1. Mixed 24 g (30%) of the crude tall oil, 12 g (15%) of polyglycols, 32 g (40%) of the flotation reagent-oxal, 12 g (15%) of beet molasses and mixed the resulting mass at a temperature of 65°C for 3 hours. The result was 80 g of a light brown liquid with a density of 1.07 g/cm3, the freezing temperature of minus 38°C, flash point 102°With, plastic viscosity 627 SDR. Selected 3 ml of the fluid and at the same time mixer at 500 rpm was mixed with 300 ml clayey mud density of 1.12 g/cm 3(based on koganecho bentonite), treated with 0.5% vol. CMC-500 and 0.2% soda ash. Thus obtained drilling fluid was investigated by filtration, foaming and tribological parameters. The results of the research of the technological properties of the drilling fluid treated the proposed lubricant additive shown in table 1.

Example 2. Mixed 8 g (10%) of the crude tall oil, 16 g (20%) of polyglycols, 40, (50%) of the flotation reagent-oxal, 16, (20%) of beet molasses and mixed the resulting mass at a temperature of 95°C for 2.5 hours. The result was 80, light brown liquid with a density of 1.1 g/cm3, the freezing temperature of minus 30°C, flash point 107°With, plastic viscosity 771 SDR. Then, similarly to example 1, the obtained liquid was treated clay mud and studied its technological properties, the results of which are presented in table 1.

Properties of samples of lubricant additives on the presented examples are summarized in table 2.

Table 1

Technological properties of clay mud, treated with a 1% vol. prototype and offer lubrication additive
Sample lubricant additivesTechnological properties of the drill is the first solution after processing lubricant additives
Density, g/cm3The rate of filtration, cm3/30 minTribological properties at specific load, MPa
The coefficient of frictionThe wear rate (mg/min
1212
the placeholder1,0580,280,461,041,42
example 11,0950,1360,180,560,8
example 21,114,50,1260,30,821

Table 2
Sample lubricant additivesProperties sample
AppearanceDensity, g/cm3Freezing point, °The flash point in an open crucible, °Plastic viscosity, centipoise
example 1liquid from light-brown to brown1,07-3810262
example 21,1-30107771

The rate of filtration was determined by the standard ANI using the device VM-6.

Density, pour point and flash point were determined respectively according to GOST-3900, GOST 20287 (method B) and GOST 4333.

Tribological parameters were determined by car friction MT-3 with a pair of friction ring (Art. 40 HN) - rod (45) at sliding velocity of 0.8 m/S.

The given examples show that the proposed lubricant additive can significantly improve the processing properties of the clay mud in comparison with the prototype. From table 1 it is seen that the coefficient of friction of steel in the environment of the drilling fluid treated with the proposed lubricant additive, reduced in comparison with the prototype 35...61%, and the wear rate wear rate is reduced accordingly on 21...46%. In addition, after processing the drilling fluid of the proposed lubricant additive its rate of filtration decreases by 37...44%, and the decrease in density caused by foaming, reduced from 6.3% (for the prototype) to 0.9%, i.e. almost 7 times.

Thus, the proposed invention can be used in drilling to improve the quality of drilling fluids, water-based indicators lubricating and stabilizing ability, and to reduce foaming and wear of the drilling equipment.

Lubricant additive for drilling fluid is water-based, containing crude tall oil, polyglycols, flotation-oxal, characterized in that it further comprises sugar beet molasses in the following ratio, wt.%:

Crude tall oil10-30
Polyglycols15-20
Flotation-oxal40-50
Molasses beet15-20



 

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