Drilling mud

FIELD: drilling wells; water-base drilling muds.

SUBSTANCE: drilling mud contains the following components, mass-%: clay, 1.5-3.0; carboxymethyl cellulose, 0.1-0.3;carboxymethyl starch, 0.75-1.5; mixture of ethers and amides of fatty acids and ethanol amides, 0.75-1.0; product of rectification of propylene oligomers of isoolefin type, fraction C13-C15, 0.75-1.5;lubricating additive, 0.5-3.0; the remainder being water.

EFFECT: enhanced inhibition ability of drilling mud at improved technological parameters.

2 tbl, 3 ex

 

The invention relates to the field of drilling, in particular for drilling fluids, water-based.

For drilling in clay and sandy rocks developed various compositions and formulations inhibited drilling fluids, water-based, including inhibiting additives: NaCl, KCl, CaCl2, CA(Oh)2, 4l2O3·N2O, Sao3SiO2·2H2O, Na2SiO3To2SiO3and other polyelectrolytes, as well as silicone fluids NGL-10, 11, polyglycols and other (Egister "Chemical treatment of drilling fluids". M., Nedra, 1972). Developed inhibited muds reduced hydration of clay minerals, however, have decided to the full extent of the problem of stability of the walls of the wells and reduce complications in the process of building wells in clay and sand rock complex.

Silicone fluids, silicates of sodium, potassium and their aqueous solutions have a high alkalinity, which reduces inhibitory ability on clay layers.

The closest technical solution chosen for the prototype is drilling mud containing clay, carboxymethylcellulose, inhibitory additive, lubricant additive, and water (patent RF №2174996, CL 09 To 7/02 from 12.01.2000,).

However, the composition of the drilling fluid has a low inhibitory ability, AFL is stvie which can increase the intensity of the transition clay solid phase in the drilling fluid, therefore, it will require additional costs of reagents fluid viscosity and rheological parameters of the solution, or multiple dilution technical water, followed by treatment with reagents, stabilizers to reduce the filter.

The objective of the invention is the enhancement of inhibitory capacity of the drilling fluid while simultaneously improving technological parameters of the solution.

The problem is solved due to the fact that the drilling fluid, including clay, carboxymethylcellulose, inhibitory additive, lubricant additive, and water, further comprises a controller structural-mechanical properties - carboximetilkrahmal and the emulsifier is a mixture of esters and amides of fatty acids and ethanolamine, as well as inhibiting additives - product of the distillation of propylene oligomers italianovero type fraction With13-C15in the following ratio, wt.%:

clay1,5-3,0
carboxymethylcelluloseof 0.1-0.3
carboximetilkrahmal0,75-1,5
the mixture of esters and amides of fatty acids
and ethanolamides0,75-1,0
product rectification oligomers
propylene is italianovero type
fractions With11-C150,75-1,5
lubricant additive0,5-3,0
waterrest

As components of drilling mud can be used

the clay in the form of bentonite (TU 39-0147001-105-93);

reagent stabilizer carboxymethylcellulose, such as Cancel 3 (TO-002-50277563-00);

the regulator structural-mechanical properties of carboximetilkrahmal, such as CMC-BUR (TU-016-32957739-01);

inhibitory additive - product of the distillation of propylene oligomers italianovero type fraction C13-C15(THE 2411-020-05766801-94) a modifier of the solid phase (ITF);

emulsifier, a mixture of esters and amides of fatty acids and ethanolamine (TU 6-14-1035-79);

lubricant additive reagent based monoethanolamine salt of tall oil with solvent SUNBUR 1101 (DRC-TT) (TU-014-00151816-2001).

Comparative analysis of the claimed invention with the prototype and analogues leads to the conclusion that the proposed solution meets the criterion of "novelty" and "significant differences", because in its composition as an inhibitor of the solid phase contains a new agent modifier of the solid phase is a product of distillation of propylene oligomers italianovero type fraction C13-C15in addition, contains the emulsifier is a mixture of JFK and the ditch and fatty acid amides and ethanolamides.

Examples of the preparation of the proposed solution in laboratory conditions

Example 1. 15 g of bentonite shut in 956,5 g fresh water and stirred. In the resulting clay slurry injected with 1 g of Kamal 3 and stirred for 20 min, and then injected with 7.5 g KMC-DRILL and re-mix. In the stabilized solution is injected 7.5 g ITF with the included 7.5 g of emulsifier; mix and enter 5 g SUNBUR 1101 (DRC-TT). After stirring for 30 min the solution is prepared.

Example 2. to 22.5 g of bentonite shut in 926,75 g fresh water and stirred. In the resulting clay slurry injected with 2 g of Kamal 3 and mix. In the stabilized solution is injected at 11.25 g ITF entered into it is 8.75 g of emulsifier; mixed and injected 17,5 g SUNBUR 1101 (DRC-TT). After stirring for 30 min the solution is prepared.

Example 3. 30 g of bentonite shut in 897 g of fresh water and stirred. In the resulting clay slurry injected 3 g Cancel 3, mix, enter 15 g KMC-DRILL and re-mix. In the stabilized solution is injected 15 g ITF with the included 10 g of emulsifier; mixed and injected 30 g SUNBUR 1101 (DRC-TT). After stirring for 30 min the solution is prepared.

Table 1 shows the component compositions of the claimed solution (compounds 1, 2, 3) and prototype (compounds 4. 5, 6).

Technologies the settings of the solutions were measured using standard instruments and methods in accordance with the regulations on quality control methods for drilling fluids, M, VNIIBT, 1972

Inhibiting properties of solutions was determined by moistening capacity indicator in accordance with RD-2-813-82, Krasnodar, Unicraft, taking into account the influence of capillary imbibition, diffusion, osmotic mass transfer in the process of hydration of the clay phase. The smaller the value of the index (Pabout), the higher the inhibiting ability of the solution.

Lubricating properties of solutions describing the friction between the filtration crust on the borehole wall and the drill pipe was determined by the ratio of shear peel condominium with the help of the device KSK - VNIIBT. The smaller the value, the less the viscosity of the mud cake and, consequently, higher lubricity and protivopravnoye properties of the solution.

Table 2 shows the results of the research.

Table 1
number ofComponent composition, wt.%.
ClayCMCKMK-BOURGInhibi dominant additiveEmulsifierLubricant additiveInhibi dominant additive-polyglycolCMCInhibi dominant additive - KClLubricant additiveWater
Composition 10,10,750,750,750,5----rest
Part 22,250,21,121,120,871,75---rest
Part 33,00,31,51,51,03,0----rest
Part 45,0-----30,2050,50rest
Part 510,0-----40,3570,75rest
Part 615,0-----50,5091,00rest

Table 2
number ofThe technological parameters of the solutions
density, g/cm3viscosity,the rate of filtration, cm3SNA, the AAAKSKPaboutmm/hpH
1 min10 min
Composition 11,01264,214,526,10,105is 0.2609,5
Part 21,02283,521,837,50,0960,258the 9.7
Part 31,02323,129to 49.30,0870,2579,9
Part 41,022354,47,80,280,398,2
Part 51,082646,510,20,250,378,6
Part 6L1435314.4V20,20,230,36 8,9

As follows from the analysis of table 2, the claimed solution (compounds 1-3) has a much better process parameters, ingibiruyushee and lubricating properties compared with solution-prototype (compounds 4-6)that will provide the technological efficiency of its use in drilling wells at intervals of potentially unstable clayey-sandy rocks.

The application of the proposed solution allows due to decreased hydration of the clay constituent of the formation of the aqueous phase to exclude cavernosometry, the sticking of the drilling tool, to maintain the stability of the wellbore.

Drilling mud, including clay, carboxymethylcellulose, inhibitory additive, lubricant additive and water, wherein the solution further comprises a controller structural-mechanical properties - carboximetilkrahmal and the emulsifier is a mixture of esters and amides of fatty acids and ethanolamine, as well as inhibiting additives - product of the distillation of propylene oligomers italianovero type fraction With13-C15in the following ratio, wt.%:

Clay1,5-3,0
Carboxymethylcelluloseof 0.1-0.3
Carboximetilkrahmal 0,75-1,5
The mixture of esters and amides of fatty acids
and ethanolamides0,75-1,0
Product rectification oligomers
propylene italianovero type
fractions With13-C150,75-1,5
Lubricant additive0,5-3,0
WaterRest



 

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Drilling mud // 2268909

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SUBSTANCE: drilling mud contains the following components, mass-%: clay, 1.5-3.0; carboxymethyl cellulose, 0.1-0.3;carboxymethyl starch, 0.75-1.5; mixture of ethers and amides of fatty acids and ethanol amides, 0.75-1.0; product of rectification of propylene oligomers of isoolefin type, fraction C13-C15, 0.75-1.5;lubricating additive, 0.5-3.0; the remainder being water.

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