CN110746944B - Flow pattern regulator for synthetic base drilling fluid and preparation method thereof - Google Patents
Flow pattern regulator for synthetic base drilling fluid and preparation method thereof Download PDFInfo
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- CN110746944B CN110746944B CN201911119955.8A CN201911119955A CN110746944B CN 110746944 B CN110746944 B CN 110746944B CN 201911119955 A CN201911119955 A CN 201911119955A CN 110746944 B CN110746944 B CN 110746944B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07H—SUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
- C07H1/00—Processes for the preparation of sugar derivatives
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07H—SUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
- C07H13/00—Compounds containing saccharide radicals esterified by carbonic acid or derivatives thereof, or by organic acids, e.g. phosphonic acids
- C07H13/02—Compounds containing saccharide radicals esterified by carbonic acid or derivatives thereof, or by organic acids, e.g. phosphonic acids by carboxylic acids
- C07H13/04—Compounds containing saccharide radicals esterified by carbonic acid or derivatives thereof, or by organic acids, e.g. phosphonic acids by carboxylic acids having the esterifying carboxyl radicals attached to acyclic carbon atoms
- C07H13/06—Fatty acids
Abstract
The invention discloses a flow pattern regulator for synthetic base drilling fluid and a preparation method thereof, wherein the flow pattern regulator is alkyl glucamide with two or more glucose chain segments generated by the reaction of fatty acid or fatty acid methyl ester and glucose methylamine, and is obtained by adding the glucose methylamine and binary or polybasic fatty acid/acid ester into a polar solvent, heating to 140-150 ℃ under the action of a sodium alkoxide catalyst for reflux reaction for 4-5 h, then evaporating the polar solvent until no liquid drips out, cooling to obtain a waxy solid, drying and crushing; the flow pattern regulator for the synthetic base drilling fluid is low in toxicity and easy to degrade, and a large number of hydroxyl and amido polar groups are arranged on a molecular chain of the flow pattern regulator, so that the flow pattern regulator is easy to associate in a water-in-oil emulsion to form a weak gel form, effectively tackifies in a low flow rate state, and suspends solid-phase particles; under the action of pumping and other external forces, the gel state is easy to damage, and the drilling fluid recovers good fluidity, thereby being beneficial to improving the mechanical drilling speed and improving the scouring capability to the well wall.
Description
Technical Field
The invention relates to the technical field of oilfield chemicals, and particularly relates to a flow pattern regulator for synthetic base drilling fluid and a preparation method thereof.
Background
The oil-based drilling fluid is a drilling fluid system which is composed of oil serving as a continuous phase, water serving as a dispersed phase, and an emulsifier, a shear enhancing agent, a plugging agent, a filtrate loss reducer, alkali and other chemical agents. Compared with water-based drilling fluid, the drilling fluid has the advantages of good lubrication, pollution resistance, high temperature resistance, strong inhibition, oil-gas layer protection and the like, so that the drilling fluid is more and more widely applied to difficult wells such as deep wells, ultra-deep wells, wells with complex structures, special stratum wells, large-displacement horizontal wells and the like.
However, with the increasing number of complex wells and the stricter environmental regulations, higher demands are made on the performance of the drilling fluid. The synthetic base drilling fluid is produced under the condition that the water base drilling fluid can not meet the performance requirements of complex conditions under the well and the traditional mineral oil base (diesel oil and white oil) drilling fluid can not meet the environmental protection requirements. The synthetic base drilling fluid has the advantages of low toxicity, biodegradability, no fluorescence and the like on the basis of the advantages of excellent temperature resistance, strong inhibition, good lubricity and the like of the traditional mineral oil drilling fluid, and is widely used in ocean deep water and environment sensitive areas.
The synthetic base oil has low viscosity, for example, the viscosity of the gas oil is only about half of that of the white oil; and the synthetic base oil does not contain benzene substances, so that the solubility of the tackifying substances used in the traditional mineral oil is poor, the suspension property of the synthetic base oil on solid-phase particles such as barite is poor, and particularly, a detritus bed is formed under the condition that the viscosity of the base oil is further reduced under the high-temperature environment at the bottom of a well, so that the accident is complicated.
At present, organic soil is commonly used in oil-based drilling fluid to improve the flow pattern and improve the suspension capacity. However, the organic soil can reduce the solid phase capacity of the oil-based drilling fluid, pollute low-permeability reservoirs, and is easy to thicken at high temperature, so that the mud performance is deteriorated. Although products such as reaction products of butyl rubber, isocyanate and polyhydric alcohol or aldehyde are common tackifiers in the existing oil-based drilling fluid system, the products have the defects of toxicity, difficult degradation and the like, and are not suitable for being continuously used as flow pattern regulators of synthetic-based drilling fluids.
Disclosure of Invention
The invention aims to provide a flow pattern regulator for synthetic base drilling fluid, which is suitable for synthetic base drilling fluid, has low toxicity, is easy to biodegrade, and can improve the effects of viscosity increasing and emulsion stability.
The invention also aims to provide a preparation method of the flow pattern regulator for the synthetic base drilling fluid.
Therefore, the technical scheme of the invention is as follows:
a flow pattern regulator for synthetic base drilling fluid is an alkyl glucamide which is generated by the reaction of fatty acid or fatty acid methyl ester and glucose methylamine and has two or more glucose chain segments; wherein the fatty acid or the fatty acid methyl ester is a dibasic fatty acid with a carbon chain length of 6-18 and a methyl ester thereof, or a polybasic fatty acid with a carbon chain length of 10-18 and a methyl ester thereof; the feeding proportion of the fatty acid or the fatty acid methyl ester and the glucose methylamine meets the following requirements: the molar ratio of the amino group of the glucose methylamine to the carboxyl group of the fatty acid is 1: 1.2-1.6; the molar ratio of the amino group of the glucose methylamine to the ester group of the fatty acid methyl ester is 1: 1.2-1.6.
The flow pattern regulator for the synthetic base drilling fluid utilizes the reaction of glucose methylamine and dibasic fatty acid and methyl ester thereof or polybasic fatty acid and methyl ester thereof to form a product with a plurality of amide groups and a plurality of glucose chain end structures. Because the molecular chain of the product has a large number of polar groups such as hydroxyl and amido, the product is easy to associate in a water-in-oil emulsion to form a weak gel form, and can effectively increase viscosity and suspend solid-phase particles under a low flow rate state; under the action of pumping and other external forces, the gel state is easy to damage, and the drilling fluid recovers good fluidity, thereby being beneficial to improving the mechanical drilling speed and improving the scouring capability to the well wall. Meanwhile, the glucose chain segment enables the product to have the characteristics of low toxicity and easy biodegradation, and is more suitable to be used as a flow pattern regulator for synthesizing the environment-friendly drilling fluid.
Preferably, the dibasic fatty acid is adipic acid, suberic acid, sebacic acid, dodecanedioic acid, tetradecanedioic acid, hexadecanedioic acid or octadecanedioic acid; the polybasic fatty acid is a deca-tribasic fatty acid, a tetradecyl-tribasic fatty acid or an octadeca-tribasic fatty acid.
A preparation method of a flow pattern regulator for synthetic base drilling fluid comprises the following steps:
s1, adding glucose methylamine and dibasic or polybasic fatty acid/acid ester into a polar solvent, mixing and stirring uniformly, adding a sodium alkoxide catalyst, heating to 130-140 ℃, and carrying out reflux reaction for 4-5 hours;
wherein the molar ratio of the amino group of the glucose methylamine to the ester group of the fatty acid methyl ester is 1: 1.2-1.6;
s2, removing the polar solvent in the mixed liquid obtained in the step S1 through rotary evaporation, and drying and crushing the wax-like solid obtained through cooling to obtain the flow pattern regulator product.
Preferably, the polar solvent is at least one of ethanol, propanol, butanol and propylene glycol.
Preferably, the sodium alkoxide catalyst is sodium methoxide or sodium ethoxide.
Preferably, the addition amount of the sodium alkoxide catalyst is 0.1-0.21% of the total weight of the glucose methylamine and the fatty acid, or 0.1-0.21% of the total weight of the glucose methylamine and the fatty acid methyl ester.
Compared with the prior art, the flow pattern regulator for the synthetic base drilling fluid not only has the characteristics of low toxicity and easy degradation and environmental protection, but also has a large amount of polar groups of hydroxyl and amido on the molecular chain, so that the polar groups are easy to associate in a water-in-oil emulsion to form a weak gel form, and the solid-phase particles can be effectively tackified and suspended in a low flow rate state; under the action of external force such as pumping and the like, the gel state is easy to damage, and the drilling fluid recovers good fluidity, thereby being beneficial to improving the mechanical drilling speed and improving the scouring capability to the well wall; in addition, the structure of the drilling fluid has the characteristics of hydrophilicity and lipophilicity, so that the drilling fluid also has the characteristics of strong surface activity and capability of improving the emulsion stability of the drilling fluid.
Detailed Description
The present invention will be further described with reference to the following examples, which are not intended to limit the invention in any way. In the following examples 1 to 10 and comparative examples, each component was purchased from a commercially available product, and the specific amounts thereof were in parts by weight.
Example 1
A flow pattern regulator for synthetic base drilling fluid is prepared by the following steps: sequentially adding 53 parts of glucose methylamine, 24 parts of adipic acid and 190 parts of ethanol into a stainless steel reaction kettle provided with a mechanical stirrer and a condenser, uniformly mixing and stirring, adding 0.08 part of sodium ethoxide, heating in an oil bath to 130 ℃, and carrying out reflux reaction for 4 hours to obtain viscous liquid; performing rotary evaporation on the viscous liquid to remove ethanol, and then cooling to obtain a waxy solid; drying and crushing the waxy solid to obtain the flow pattern regulator.
Comparative example
A flow pattern regulator for synthetic base drilling fluid is prepared by the following steps: sequentially adding 52 parts of glucose methylamine, 19 parts of succinic acid and 190 parts of butanol into a stainless steel reaction kettle provided with a mechanical stirrer and a condenser, uniformly mixing and stirring, adding 0.071 parts of sodium ethoxide, heating to 130 ℃ in an oil bath, and carrying out reflux reaction for 4 hours to obtain viscous liquid; performing rotary evaporation on the viscous liquid to remove butanol, and then cooling to obtain a waxy solid; drying and crushing the waxy solid to obtain the flow pattern regulator.
Example 2
A flow pattern regulator for synthetic base drilling fluid is prepared by the following steps: adding 43 parts of glucose methylamine, 25 parts of suberic acid and 200 parts of propanol into a stainless steel reaction kettle provided with a mechanical stirrer and a condenser in sequence, mixing and stirring uniformly, adding 0.14 part of sodium ethoxide, heating in an oil bath to 130 ℃, and carrying out reflux reaction for 5 hours to obtain viscous liquid; performing rotary evaporation on the viscous liquid to remove propanol, and then cooling to obtain a waxy solid; drying and crushing the waxy solid to obtain the flow pattern regulator.
Example 3
A flow pattern regulator for synthetic base drilling fluid is prepared by the following steps: adding 43 parts of glucose methylamine, 33 parts of dimethyl sebacate and 150 parts of ethanol into a stainless steel reaction kettle provided with a mechanical stirrer and a condenser in sequence, mixing and stirring uniformly, adding 0.15 part of sodium ethoxide, heating in an oil bath to 130 ℃, and carrying out reflux reaction for 5 hours to obtain viscous liquid; performing rotary evaporation on the viscous liquid to remove ethanol, and then cooling to obtain a waxy solid; drying and crushing the waxy solid to obtain the flow pattern regulator.
Example 4
A flow pattern regulator for synthetic base drilling fluid is prepared by the following steps: adding 42 parts of glucose methylamine, 35 parts of dodecanedioic acid and 200 parts of butanol into a stainless steel reaction kettle provided with a mechanical stirrer and a condenser in sequence, mixing and stirring uniformly, adding 0.16 part of sodium ethoxide, heating in an oil bath to 140 ℃, and carrying out reflux reaction for 5 hours to obtain viscous liquid; performing rotary evaporation on the viscous liquid to remove butanol, and then cooling to obtain a waxy solid; drying and crushing the waxy solid to obtain the flow pattern regulator.
Example 5
A flow pattern regulator for synthetic base drilling fluid is prepared by the following steps: sequentially adding 38 parts of meglumine, 40 parts of dimethyl tetradecanedioate and 200 parts of propylene glycol into a stainless steel reaction kettle provided with a mechanical stirrer and a condenser, uniformly mixing and stirring, adding 0.16 part of sodium methoxide, heating to 140 ℃ in an oil bath, and carrying out reflux reaction for 5 hours to obtain viscous liquid; performing rotary evaporation on the viscous liquid to remove propylene glycol, and then cooling to obtain a waxy solid; drying and crushing the waxy solid to obtain the flow pattern regulator.
Example 6
A flow pattern regulator for synthetic base drilling fluid is prepared by the following steps: adding 33 parts of meglumine, 40 parts of dimethyl hexadecanedioate and 200 parts of propylene glycol into a stainless steel reaction kettle provided with a mechanical stirrer and a condenser in sequence, mixing and stirring uniformly, adding 0.15 part of sodium ethoxide, heating to 140 ℃ in an oil bath, and carrying out reflux reaction for 5 hours to obtain viscous liquid; performing rotary evaporation on the viscous liquid to remove propylene glycol, and then cooling to obtain a waxy solid; drying and crushing the waxy solid to obtain the flow pattern regulator.
Example 7
A flow pattern regulator for synthetic base drilling fluid is prepared by the following steps: adding 31 parts of glucose methylamine, 40 parts of octadecanedioic acid and 200 parts of butanol into a stainless steel reaction kettle provided with a mechanical stirrer and a condenser in sequence, mixing and stirring uniformly, adding 0.18 part of sodium ethoxide, heating in an oil bath to 140 ℃, and carrying out reflux reaction for 5 hours to obtain viscous liquid; performing rotary evaporation on the viscous liquid to remove butanol, and then cooling to obtain a waxy solid; drying and crushing the waxy solid to obtain the flow pattern regulator.
Example 8
A flow pattern regulator for synthetic base drilling fluid is prepared by the following steps: adding 49 parts of glucose methylamine, 31 parts of deca-tertiary fatty acid and 200 parts of butanol into a stainless steel reaction kettle provided with a mechanical stirrer and a condenser in sequence, mixing and stirring uniformly, adding 0.16 part of sodium ethoxide, heating to 140 ℃ in an oil bath, and carrying out reflux reaction for 5 hours to obtain viscous liquid; performing rotary evaporation on the viscous liquid to remove butanol, and then cooling to obtain a waxy solid; drying and crushing the waxy solid to obtain the flow pattern regulator.
Example 9
A flow pattern regulator for synthetic base drilling fluid is prepared by the following steps: adding 43 parts of glucose methylamine, 37 parts of tetradecatrienoic acid trimethyl ester and 200 parts of ethanol into a stainless steel reaction kettle provided with a mechanical stirrer and a condenser in sequence, mixing and stirring uniformly, adding 0.16 part of sodium methoxide, heating to 140 ℃ in an oil bath, and carrying out reflux reaction for 5 hours to obtain viscous liquid; performing rotary evaporation on the viscous liquid to remove ethanol, and then cooling to obtain a waxy solid; drying and crushing the waxy solid to obtain the flow pattern regulator.
Example 10
A flow pattern regulator for synthetic base drilling fluid is prepared by the following steps: sequentially adding 43 parts of glucose methylamine, 38 parts of octadecanoic ternary fatty acid and 200 parts of ethanol into a stainless steel reaction kettle provided with a mechanical stirrer and a condenser, uniformly mixing and stirring, adding 0.16 part of sodium ethoxide, heating to 140 ℃ in an oil bath, and carrying out reflux reaction for 5 hours to obtain viscous liquid; performing rotary evaporation on the viscous liquid to remove ethanol, and then cooling to obtain a waxy solid; drying and crushing the waxy solid to obtain the flow pattern regulator.
And (3) performance testing:
the flow pattern regulators prepared in examples 1-10 and comparative example 1 are applied to a gas-to-oil drilling fluid system for performance evaluation in sequence. The formula of the gas-to-oil drilling fluid base slurry comprises the following components: 250mL of gassed oil (Saraline185V) +3 wt.% Ca (OH)2+ 2% by weight of emulsifier + 2% by weight of organic soil +28mLCaCl2Aqueous solution (20 wt.%) +2 wt.% fluid loss additive +200 wt.% barite.
The test results are shown in table 1.
Table 1:
in table 1 above, PV is the plastic viscosity and YP is the dynamic shear force, which is used to characterize the viscosity of the drilling fluid;
and
the readings of the OFITE-900 rotational viscometer at 6r/min and 3r/min are respectively expressed, and the readings are used for characterizing the suspension capacity of the drilling fluid; ES is the breaking voltage, which is used to characterize the emulsion stability of oil-based drilling fluids; FLHTHPThe obtained high-temperature high-pressure filtration loss was measured at 150 ℃.
From the evaluation results in the table 1, it can be seen that the flow pattern regulator for the synthetic base drilling fluid prepared in the embodiments 1 to 10 can significantly improve the dynamic shear force and 3/6-turn reading of the system, that is, the suspension capacity of the system is improved, and the influence on the plastic viscosity, the demulsification voltage and the high-temperature and high-pressure filtration loss is small when the flow pattern regulator is applied to the gas-to-oil drilling fluid. The flow pattern regulator is added into the drilling fluid, so that the suspension property is improved, and obvious side effects are avoided. When the carbon chain length is too short (comparative example), the thickening effect is poor, probably due to the system being more hydrophilic.
In addition, as can be seen from table 1, the synthetic base drilling fluid prepared in example 6 has the best effect in all aspects, and the carbon chain length of hexadecanedioic acid is most suitable, and the flow pattern regulator prepared by reacting the hexadecanedioic acid with the meglumine is most suitable to be used as the flow pattern regulator in gas-to-oil drilling fluid.
In addition, the flow pattern regulator prepared in the embodiment 1-10 has the characteristics of no toxicity and easy biodegradation through the tests of biocompatibility experiments and biodegradation experiments.
Claims (5)
1. A flow pattern regulator for synthetic base drilling fluid is characterized in that the flow pattern regulator is alkyl glucamide with two or more glucose chain segments generated by the reaction of fatty acid or fatty acid methyl ester and glucose methylamine; wherein the fatty acid or the fatty acid methyl ester is a dibasic fatty acid with a carbon chain length of 6-18 and a methyl ester thereof, or a polybasic fatty acid with a carbon chain length of 10-18 and a methyl ester thereof; the feeding proportion of the fatty acid or the fatty acid methyl ester and the glucose methylamine meets the following requirements: the molar ratio of the amino group of the glucose methylamine to the carboxyl group of the fatty acid is 1: 1.2-1.6; the molar ratio of the amino group of the glucose methylamine to the ester group of the fatty acid methyl ester is 1: 1.2-1.6;
the dibasic fatty acid is adipic acid, suberic acid, sebacic acid, dodecanedioic acid, tetradecanedioic acid, hexadecanedioic acid or octadecanedioic acid; the polybasic fatty acid is a deca-tribasic fatty acid, a tetradecyl-tribasic fatty acid or an octadeca-tribasic fatty acid.
2. The preparation method of the flow pattern regulator for the synthetic base drilling fluid, which is characterized by comprising the following steps:
s1, adding glucose methylamine and fatty acid or glucose methylamine and fatty acid methyl ester into a polar solvent, mixing and stirring uniformly, adding a sodium alkoxide catalyst, heating to 130-140 ℃, and carrying out reflux reaction for 4-5 hours;
wherein the dosage of the polar solvent is 1.9-2.8 times of the total weight of the glucose methylamine and the fatty acid, or 1.9-2.8 times of the total weight of the glucose methylamine and the fatty acid methyl ester;
s2, removing the polar solvent in the mixed liquid obtained in the step S1 through rotary evaporation, and drying and crushing the wax-like solid obtained through cooling to obtain the flow pattern regulator product.
3. The flow pattern modifier for synthetic-based drilling fluids according to claim 2, wherein the polar solvent is at least one of ethanol, propanol, butanol, and propylene glycol.
4. The flow pattern modifier for synthetic-based drilling fluid of claim 3, wherein the sodium alkoxide catalyst is sodium methoxide or sodium ethoxide.
5. The flow pattern modifier for synthetic-based drilling fluid according to claim 4, wherein the sodium alkoxide catalyst is added in an amount of 0.1-0.21% by weight of the total weight of the meglumine and the fatty acid, or 0.1-0.21% by weight of the total weight of the meglumine and the fatty acid methyl ester.
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| CN103013465B (en) * | 2012-12-27 | 2014-11-05 | 中国石油集团渤海钻探工程有限公司 | Polyhydroxy-structure emulsifier and oil-base drilling fluid containing same |
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