RU2590254C1 - Drilling complex reagent for water-based fluids - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: drilling complex reagent for drilling fluids on water base is prepared by mixing light tall oil, glycols, flotation reagent-oksal, alkali, oxyethylated fatty alcohols C₁₂-C₁₄, head impurities concentrate and intermediate fraction of ethyl alcohol from food raw material at temperature 60-65°C for 2-2.5 h, with the following ratio of components, wt%: light tall oil 40-45; polyglycols 21-28; flotation reagent-oxal 11-14; alkali 3-7; oxyethylated fatty alcohols of fraction C₁₂-C₁₄ 3-6; head impurities concentrate and intermediate fraction of ethyl alcohol from food raw material 10-15.

EFFECT: improved antifriction, anti-sticking, water-repellent, anticorrosion and surface-active properties of clay and clay-free irrigating solutions, higher quality of opening of oil and gas producing formations due to improvement of permeability of porous space of collectors.

1 cl, 2 tbl, 2 ex

Description

The invention relates to the field of drilling oil and gas wells, in particular to reagents for the integrated control of the properties of water-based flushing fluids.

Known reagent complex action for process fluids used in drilling and workover (patent RF №2199570), containing, by weight. %: VAT residue of synthetic fatty acids 47-50, ethanolamines 1-3, diesel fuel or kerosene 49-50. The advantage of this reagent is, in addition to improving clay solutions, lubricating properties, stabilization of the emulsion of the second kind.

Also known is a complex action reagent for process fluids used in drilling and workover (RF patent No. 2271378), containing, by weight. %: mixture in a ratio of 2: 3: 4, respectively, paraffinic, naphthenic and aromatic hydrocarbons 70-80, the solvent is diesel fuel or kerosene 20-30.

The disadvantages of the above analogues are:

- incompatibility with clayless aqueous wash liquids;

- high pour point (plus 5 ° C);

- weak anti-seizure properties.

The closest technical solution to the claimed invention is a lubricant additive (RF patent No. 2269562), which contains crude tall oil, polyglycols, flotoreagent-oxal and beet molasses in a ratio of components, wt. %:

crude tall oil 10-30 polyglycols 15-20 flotoreagent oxal 40-50 beet molasses 15-20

The lubricant additive has a pour point of up to minus 38 ° C, improves the stability of the clay solution and its antiwear and antifriction properties.

The disadvantages of this lubricant additives are:

- lack of compatibility with clayless biopolymer solutions;

- unsatisfactory indicators of antifriction, anti-seizing properties when processing clayless biopolymer solutions (table. No. 2).

The objective of the invention is to improve the anti-friction, anti-seize and hydrophobic properties of clay and non-clay wash fluids based on water, increase the quality of opening of oil and gas reservoirs.

To solve this problem, a drilling complex reagent for water-based washing fluids was prepared by mixing light tall oil, polyglycols, flotoreagent-oxal, alkali, ethoxylated fatty alcohols of the C ₁₂ -C ₁₄ fraction, head impurities concentrate and an intermediate ethyl alcohol fraction from food raw materials, heating to 60-65 ° C and stirring for 2-2.5 hours, in the following ratio of components, wt. %:

light tall oil 40-45 polyglycols 21-28 flotoreagent oxal 11-14 alkali 3-7 ethoxylated fatty alcohols fractions C ₁₂ -C ₁₄ 3-6 concentrate head impurities and intermediate fraction of ethyl food grade alcohol 10-15

As the ethoxylated fatty alcohols of the C12-Q4 fraction, alcohols with ten moles of ethylene oxide in an alcohol molecule are used.

The proposed reagent is introduced into the washing liquid during drilling during 1-2 circulation cycles, into the suction line of the pump at a concentration of 0.5-1.5%.

The preparation of the proposed drilling complex reagent is illustrated by the following examples.

Example 1. Mixed 31 g (28%) of polyglycol, 12 g (11%) of flotation reagent-oxal, 36 g (40%) of tall oil, 9 g (4%) of alkali, 3 g (4%) of ethoxylated fatty alcohols, 14 g (13%) of the concentrate of head impurities and the intermediate fraction of ethyl alcohol from food raw materials and the resulting mixture was stirred at a temperature of 65 ° C for two hours. The result was 105 g of a light brown liquid with a density of 1.12 g / cm ³ , a flash point in an open crucible of 98 ° C, and a nominal viscosity of 32 s.

Example 2. Mixed 24 g (21%) of polyglycol, 15 g (14%) of flotation reagent-oxal, 41 g (45%) of tall oil, 10 g (5%) of alkali, 2 g (3%) of ethoxylated fatty alcohols, 13 g (12%) of the concentrate of head impurities and an intermediate fraction of ethyl alcohol from food raw materials and the resulting mixture was stirred at a temperature of 65 ° C for two hours. The result was 105 g of a light brown liquid with a density of 1.14 g / cm ³ , pour point minus 18 ° C, a flash point of 103 ° C, and a relative viscosity of 36 s.

The properties of the samples of the complex reagent according to the presented examples are given in table. one.

Samples of the drilling complex reagent were introduced into the initial polymer clay and clayless biopolymer solutions at a concentration of 1 vol. %

General technological parameters of flushing fluids (density p, viscosity conditional HC and plastic η, PF filtration rate were determined in accordance with RD 39-00142001-773-2004 (RD 39-2-647-81) "Method for monitoring the parameters of the drilling fluid. Friction coefficient φ _to a pair of "metal skin" is determined on the 2-CTC (Ovchinnikov VP instrument Aksenov et al NA drilling fluids:. textbook for High-Tyumen: publishing "Oil and Gas University", 2011.- 354 s.). The pour point of the reagent samples was determined according to GOST 20287-91, and the temperature was yshki COC in accordance with GOST 4333-87.

Table 2 shows the compositions and parameters of the initial polymer clay (No. 1) and clayless biopolymer (No. 5) washing solutions, as well as the same solutions with additives of the prototype reagent and the previously mentioned samples of the claimed reagent.

From the above data it is seen that both the reagent prototype and the claimed reagent do not adversely affect the general technological parameters of the washing liquids, and improve the crust-forming properties of the polymer clay solution. Moreover, the samples of the claimed reagent in comparison with the prototype by 20-30% reduce the friction coefficient of the metal-crust pair. In a biopolymer clay-free solution, the claimed reagent more effectively improves the antifriction properties of the crust, in comparison with the prototype, the friction coefficient of the metal-crust pair decreases by 40-63%, i.e. 1.7-2.7 times.

Direct measurements of clay swelling indices on Zhigach-Yarov special instruments, and capillaries of various designs provide information on the level of hydrophobic properties of filtrates of washing liquids.

A general indicator of the indicated properties of the washing fluids is the recovery coefficient of the permeability of the reservoir rocks. Performed experiments on clay swelling, capillary absorption, core permeability showed the advantages of the claimed reagent compared with the prototype.

Thus, experiments to establish the influence of the prototype and the claimed reagent on core permeability, performed on the PPA tester (FANNLtd), showed that the permeability recovery coefficients are 83.4% and 94.4%, respectively.

Thus, the proposed invention can be used in drilling wells to improve the performance of water-repellent, antifriction, anti-seizing properties of water-based flushing fluids, as well as the quality of opening of oil and gas reservoirs.

Claims (2)

1. Drilling complex reagent for water-based flushing fluids, characterized in that it is prepared by mixing light tall oil, polyglycols, flotoreagent-oxal, alkali, ethoxylated fatty alcohols fraction C ₁₂ -C ₁₄ , concentrate head impurities and an intermediate fraction of ethyl alcohol from food raw materials at a temperature of 60-65 ° C for 2-2.5 hours, in the following ratio of components, wt.%:
light tall oil 40-45 polyglycols 21-28 flotoreagent oxal 11-14 alkali 3-7 ethoxylated fatty alcohols fractions C ₁₂ -C ₁₄ 3-6 concentrate head impurities and intermediate fraction of ethyl food grade alcohol 10-15 2. The reagent according to claim 1, characterized in that the indicated alcohols with ten moles of ethylene oxide in the alcohol molecule are used as the ethoxylated fatty alcohols of the C ₁₂ -C ₁₄ fraction.