RU2091420C1 - Drilling mud additive - Google Patents

Abstract

FIELD: oil and gas production. SUBSTANCE: additive contains ethylene and propylene oxide-glycerol or ethylenediamine addition product or ethylene oxide-fatty amine or fatty alcohol adduct; methyldiethylalkoxymethylammonium methylsulfate or bis(alkylpolyoxyethylene) phosphate; and solvent. EFFECT: improved performance characteristics. 2 tbl

Description

 The invention relates to drilling, in particular to improving the operational properties of drilling fluids, and can be used in the oil industry.

A well-known drilling fluid additive, including the condensation product of bottoms of synthetic fatty acids with monoethanolamine and hydroxyethylated alkyl phenol and bottoms of the production of synthetic fatty alcohols of the C ₇ C ₉ fraction or bottoms from the rectification of butyl ethers of the C ₇ C ₉ fractions, or a mixture thereof (aut St. N 1627554, C 09 K 7/02, 1991). This additive contains a complex mixture of bottoms of production residues having an unstable composition, which leads to inconsistency of properties; and has a pour point from (-10) to (-16) ^o C, which makes it unsuitable for use at lower temperatures.

A well-known additive for drilling fluid, including the condensation product of monoethanolamine and crude tall oils and a by-product with a boiling point of not higher than 165 ^o C production of butyl alcohols by the method of oxosynthesis from natural gas from the stage of rectification of normal butanol (ed. St. N 1792959, C 09 K 7 / 02, 1993). The disadvantages of this additive are: unstable composition of the products used; insufficient lubricity.

 Closest to the invention is an additive for drilling mud, including a block copolymer of ethylene oxide and propylene, the additive is an ethoxylated amine, and an aromatic solvent (ed. St. N 1313860, C 09 K 7/06, 1987) reagent XT 48. However, the additive XT 48 is not effective enough for various drilling fluid formulations and does not have a sufficiently low pour point.

 The basis of the invention is the task of creating additives for drilling fluid with high defoaming efficiency, lubricity, improved rheological properties and low pour point.

The problem is solved in such a way that the drilling fluid additive, comprising a nonionic surfactant based on an oxyalkylated compound, a target additive and a solvent, contains an addition product of ethylene and propylene oxides to glycerol or ethylenediamine as a nonionic surfactant based on an oxyalkylated compound, or the product of the addition of ethylene oxide to a fatty amine, or a fatty alcohol, and, as a target additive, methyldiethylalkoxymethylammonium methyl sulfate of the general formula [C _10-18 H _21-27 OCH ₂ N (CH ₃ ) (C ₂ H ₅ ) ₂ ] ⁺ [SO ₄ CH ₃ ^- or bis (alkylpolyoxyethylene) phosphate of the formula [C _n H _{2n + 1} O (C ₂ H ₄ O) _m ] ₂ POOH, where n 8 - 10; m 6 in the following ratio of components, in wt.

The product of the addition of ethylene and propylene oxides to glycerol or ethylenediamine, or the product of the addition of ethylene oxide to a fatty amine or fatty alcohol 15 25
Methyldiethylalkoxymethyl ammonium methyl sulfate or bis (alkylpolyoxyethylene) phosphate of the above formulas 7 10
Solvent rest
As a product of the addition of ethylene and propylene oxides to glycerin, the proposed additive contains Laprol 5003-2-15 according to TU 2226-006-10488057-94. The product of the addition of ethylene and propylene oxides to ethylene diamine has the industrial name Diproxamine 157-65M, is produced according to TU 38.1011128-87. As the product of the addition of ethylene oxide to a fatty amine, the additive contains: a product having the technical name Genamine CS (Surface phenomena and surfactants / edited by A.A. Abramzon, L. Chemistry, 1984, p. 246). The product of the addition of ethylene oxide to fatty alcohol under the technical name Preparation OS-20 is described in the reference book (Surfactants, L. Chemistry, 1979, p. 303) has the general formula C _n H _{2n + 1} O (C ₂ H ₄ O) _m H, where n 14 18, m 20 (GOST 107.30-82). Methyldiethylalkoxymethylammonium methyl sulfate of the general formula [C _10-18 H _21-27 OCH ₂ (CH ₃ ) (C ₂ H ₅ ) ₂ ] ⁺ [SO ₄ CH ₃ ^- has the technical name Alkamon D and is produced according to TU 6-14-19-208 -86.

BIS (alkylpolyoxyethylene) phosphate of the formula [C _n H _{2n + 1} O (C ₂ H ₄ O)] ₂ POOH, where n 8 10, m 6 has the technical name Oksifos KD-6, TU 6-02-1148-78.

 As a solvent, the proposed additive contains a mixture of aromatic hydrocarbons Nefras Ar 120/200 according to TU 38.101809-90 or ethylbenzene fraction (EBP) according to TU 38.30225-81, or diesel fuel mixture of saturated hydrocarbons according to GOST 305-82, or isopropyl alcohol (IPA) according to GOST 9805-84, or butyl alcohol (BS) according to GOST 5208-81.

 An analysis of the known technical solutions selected in the search process showed that in science and technology there is no object similar in terms of the claimed combination of features and advantages, which allows us to conclude that the criteria of “novelty” and “inventive step” are met.

 To prove the compliance of the proposed solution with the criterion of "industrial applicability" we give examples of the preparation of the additive.

 Example 1 (prototype). Sample XT-48 is taken ready-made.

 Example 2 (proposed). To 15 g of Laprol 5003-215 add 10 g of alkamone MK and mix, after which a portion of Nefras Ap 120/200 in the amount of 75 g is added and mixed until a homogeneous solution is obtained.

 Examples 3-15 are performed analogously to example 2, changing the quantitative and qualitative ratio of components. Options for the composition of the additive are presented in table. one.

The resulting drilling fluid additive is a clear to light yellow fluid with a density of d 860 1100 kg / m ³ and a viscosity of η 15 100 mm ² / s at 20 ^o C. Solidification temperature from (-40) to (-60) ^o C.

 The additive is tested on drilling fluids prepared in accordance with TU 39-9-22-74. As drilling fluids use humate drilling fluid (N 1) and lime mud (N 2).

 Tests are carried out according to RD 39-2-645-81 Methods of monitoring the parameters of drilling fluids.

 The effectiveness of drilling fluid additives is evaluated using the following indicators in accordance with the mentioned RD.

μ коэффициент трения, определяемый на машине трения фирмы "Бароид" - характеризующий смазочные свойства бурового раствора.To _{p the} coefficient of density recovery, which is the ratio of the density of the solution after entering the additive (r) and the original (r _ref. ) Characterizing defoaming properties:

μ the coefficient of friction, determined on a friction machine company "Baroid" - characterizing the lubricating properties of the drilling fluid.

где CHC предельное статическое напряжение сдвига во времени, соответственно за 10 и 1 мин.To _t the thixotropy coefficient characterizing the rheological properties of the drilling fluid and representing the ratio

where CHC is the ultimate static shear stress in time for 10 and 1 min, respectively.

 The test results are presented in table. 2 at an additive concentration of 1% by weight of the drilling fluid.

 Analysis of the data presented in table. 2 shows that the proposed drilling fluid additive is more effective than the prototype and has a lower pour point.

 The composition of the additive includes traditional domestic components; to obtain it, no special equipment or complex hardware is required.

Claims (1)

A drilling fluid additive containing a solution of surfactants in a hydrocarbon solvent, characterized in that as a surfactant it contains the product of the addition of ethylene and propylene oxides to glycerol or ethylene diamine, or the product of the addition of ethylene oxide to a fatty amine or fatty alcohol and optionally methyldiethylalkoxymethylammonium methyl sulfate of the general formula
[(C ₁₀ -C ₁₈ H _21-27 OCH ₂ N (CH ₃ ) (C ₂ H ₅ ) ₂ ] ⁺ SO ₄ CH $\genfrac{}{}{0ex}{}{\text{-}}{\text{3}}$
or bis (alkylpolyoxyethylene) phosphate of the formula
[C _n H _{2 n + 1} O (C ₂ H ₄ O) _m ] ₂ POOH,
where n 8 10;
m 6,
in the following ratio of components, wt. The product of the addition of ethylene and propylene oxides to glycerol or ethylenediamine, or the product of the addition of ethylene oxide to a fatty amine or fatty alcohol 15 25
Methyldiethylalkoxymethylammonium methyl sulfate or bis (alkylpolyoxyethylene) phosphate 7 10
Solvent Rest

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