CN115725277A - Viscosity reducer for oil-based drilling fluid and preparation method thereof - Google Patents
Viscosity reducer for oil-based drilling fluid and preparation method thereof Download PDFInfo
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- CN115725277A CN115725277A CN202111000496.9A CN202111000496A CN115725277A CN 115725277 A CN115725277 A CN 115725277A CN 202111000496 A CN202111000496 A CN 202111000496A CN 115725277 A CN115725277 A CN 115725277A
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
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- Lubricants (AREA)
Abstract
The invention discloses a viscosity reducer for an oil-based drilling fluid and a preparation method thereof, belongs to the technical field of oil and gas drilling, and particularly relates to viscosity reduction of an oil-based drilling fluid system. The viscosity reducer for the oil-based drilling fluid comprises the following components in parts by mass: 25-40 parts of organic acid, 10-30 parts of aminophenol, 5-10 parts of epoxy monomer and 40 parts of solvent oil. The viscosity reducer can effectively reduce the viscosity cutting of an oil-based drilling fluid system, is beneficial to prolonging the service life of the oil-based drilling fluid and reducing the comprehensive cost, and is also beneficial to reducing the discharge of waste slurry, waste liquid and waste residue and protecting the environment.
Description
Technical Field
The invention belongs to the technical field of oil and gas drilling, and particularly relates to a viscosity reducer for an oil-based drilling fluid and a preparation method of the viscosity reducer.
Background
The oil-based drilling fluid is widely used in oil and gas fields at home and abroad due to good borehole wall stability, lubrication performance and reservoir protection performance, and particularly in recent years, in consideration of borehole wall stability, most of oil-based drilling fluid is used for operation in the development of domestic shale gas. However, during the field use of the oil-based drilling fluid, the oil-based drilling fluid becomes more viscous and more viscous due to the continuous accumulation of harmful solid phases, and finally cannot be normally used.
Aiming at the thickening problem of the oil-based drilling fluid, at present, oil fields are mainly treated by two ways. The first method is to use new slurry dilution method, i.e. to prepare new slurry of diluted oil-based drilling fluid and dilute old slurry of viscous oil-based drilling fluid with new slurry, because the new slurry needs to be prepared and a large amount of treating agent materials need to be supplemented after the new slurry and the old slurry are mixed, the requirement of design performance parameters can be met, and thus the cost is greatly increased. The second mode is to drag the old pulp to a special recovery processing center, carry out solid-liquid separation to the thick pulp through technical means, the solid phase of separating realizes environmental protection discharge up to standard through the aftertreatment, the liquid phase of separating then pulls back the scene and uses as the liquid phase reuse, the processing of old pulp also can increase the cost, the useless thick pulp, waste liquid, the waste residue that the processing old pulp produced still can bring the environmental protection problem simultaneously.
In addition, chinese patent publication No. CN112358857A discloses an oil-based drilling fluid viscosity reducer, which comprises the following components in parts by weight: 50-100 parts of solvent oil, 5-50 parts of surfactant, 1-20 parts of penetrating agent and 1-10 parts of stabilizer. The viscosity reducer can obviously reduce the viscosity and the shear force of the oil-based drilling fluid, improve the fluidity of the oil-based drilling fluid, reduce the pressure of a circulating pump and realize the recycling of the oil-based drilling fluid; and the high temperature resistance is excellent, the cost is low, and the economic value is high. However, the viscosity reducer is only a simple mixture of a plurality of components, and is a composite preparation in nature. And the components of the paint comprise toluene which is a harmful substance and causes pollution to the environment. In addition, the viscosity reduction rate of the viscosity reducer is reduced to a certain extent at high temperature, so that the temperature resistance of the viscosity reducer is poor.
In summary, in order to effectively solve the technical problems existing in the prior art, a viscosity reducer product for oil-based drilling fluid capable of effectively reducing the viscosity-cutting of the oil-based drilling fluid is urgently needed.
Disclosure of Invention
The viscosity reducer for the oil-based drilling fluid can effectively reduce viscosity cutting of an oil-based drilling fluid system, is beneficial to prolonging the service life of the oil-based drilling fluid and reducing the comprehensive cost, and is also beneficial to reducing discharge of waste slurry, waste liquid and waste residue and protecting the environment.
In order to realize the purpose, the technical scheme adopted by the invention is as follows:
the viscosity reducer for the oil-based drilling fluid is characterized by comprising the following components in parts by mass:
25-40 parts of organic acid, 10-30 parts of aminophenol, 5-10 parts of epoxy monomer and 40 parts of solvent oil.
The organic acid is one or more of naphthenic acid, tea oil oleic acid, cinnamic acid, palmitoleic acid and coconut oil oleic acid which are mixed according to any proportion.
The aminophenol is one of p-aminophenol and o-aminophenol or two of p-aminophenol and o-aminophenol which are mixed according to any proportion.
The epoxy monomer is one or more of ethylene oxide, propylene oxide and butylene oxide which are mixed according to any proportion.
The solvent oil is industrial white oil, and is one of 3# white oil and 5# white oil or two mixed in any proportion.
The method for preparing the viscosity reducer for the oil-based drilling fluid is characterized by comprising the following steps of:
step 1: adding organic acid, aminophenol and benzene into a reaction kettle, uniformly mixing, and replacing air in the reaction kettle with nitrogen for 1-2 hours under a stirring state; the function of this step is to mix, dilute, dissolve, disperse the reaction monomer, clear away free oxygen simultaneously, benzene is used for dissolving, diluting and dispersing the monomer and absorbs the reaction heat and dispels the heat.
Step 2: firstly, heating the mixture obtained in the step 1 to 80-90 ℃, reacting for 2-3 hours, then heating to 90-100 ℃, and evaporating generated water and benzene; the step has the function that the organic acid and the aminophenol are subjected to amidation reaction at high temperature to generate an intermediate product with a lipophilic long carbon chain and a temperature-resistant benzene ring, and the high temperature is used for accelerating the reaction speed and simultaneously evaporating reaction product water and evaporating redundant solvent benzene.
And 3, step 3: cooling the mixture obtained in the step 2 to room temperature, adding a sodium hydroxide aqueous solution with the mass fraction of 1% into a reaction kettle, fully mixing, performing vacuum dehydration, and performing nitrogen replacement; the function of this step is to neutralize the mixture with alkaline solution while providing an alkaline environment, remove moisture by dehydration and nitrogen displacement and provide an inert gas reaction environment.
And 4, step 4: heating the mixture obtained in the step (3) to 140-160 ℃, injecting an epoxy monomer into the reaction kettle, and controlling the reaction time to be 4-8 hours; the function of this step is to make the amidation reaction product obtained in step 2 and epoxy monomer proceed alkylation reaction to produce product containing ether bond with adsorption group.
And 5: and after the reaction time is reached, cooling the reaction kettle and the materials to 50-60 ℃, injecting solvent oil through a pipeline, and mixing and stirring uniformly to obtain the viscosity reducer for the oil-based drilling fluid. The step has the function of dissolving and diluting the reaction product by white oil at a certain temperature to obtain the viscosity reducer product form for the oil-based drilling fluid, which is convenient to transport, store and use.
In step 1, 50 parts of benzene are added.
In step 2, 0.2 part of an aqueous sodium hydroxide solution was added.
In step 4, the epoxy monomer is injected into the reaction kettle through a pipeline, and the injection speed is 5 parts per hour.
In step 4, after the epoxy monomer is injected into the reaction kettle, the reaction is carried out under the conditions that the temperature of the reaction kettle is 140-160 ℃ and the pressure is 0.3-0.6 MPa.
The invention has the advantages that:
1. the viscosity reducer comprises 25-40 parts of organic acid, 10-30 parts of aminophenol, 5-10 parts of epoxy monomer and 40 parts of solvent oil, and the viscosity reducer is a single synthetic reaction product of three monomers of organic acid, aminophenol and epoxy monomer through synthesis activity, and the final product is completely different from CN112358857A no matter the composition ratio. The components of the invention do not contain toxic substances, so the invention has better environmental protection and is more convenient for popularization and application. In addition, the invention has stable viscosity reducing effect under the high-temperature aging condition of 150 ℃, and has better temperature resistance. In summary, the viscosity reducer can effectively reduce the viscosity cutting of an oil-based drilling fluid system, is beneficial to prolonging the service life of the oil-based drilling fluid and reducing the comprehensive cost, and is also beneficial to reducing the discharge of waste slurry, waste liquid and waste residue and protecting the environment.
2. The organic acid in the invention is one or a plurality of naphthenic acid, tea oil oleic acid, cinnamic acid, palmitoleic acid and coconut oleic acid which are mixed according to any proportion. The used organic acid has the advantages of wide source, easily obtained raw materials, low price, controllable cost, proper chain length of lipophilic carbon chain in the molecule and the like, and if other organic acids are used, the adsorption and dispersion properties of reaction products are influenced due to the difference of the length and the spatial structure of the molecular chain.
3. The aminophenol in the invention is one of p-aminophenol and o-aminophenol or two of p-aminophenol and o-aminophenol mixed according to any proportion. The use of aminophenol and/or ortho-aminophenol has the advantage of providing a rigid group of benzene ring to improve the temperature resistance of the product.
4. The epoxy monomer in the invention is one or a plurality of epoxy monomers mixed according to any proportion, and the epoxy monomers preferably can provide ether bonds in a system so as to be beneficial to adsorption on the surface of a hydrophilic medium. If other epoxy monomers are used, the number and yield of ether bonds will be affected by the higher molecular weight and more complex molecular structure.
5. The solvent oil in the invention is industrial white oil, and is one of 3# white oil and 5# white oil or two mixed according to any proportion. The solvent oil is used for diluting and reducing viscosity, and has the advantages of low price, easy obtainment, environmental protection, no toxicity and safety. If white oil with other specifications is used, the viscosity of the white oil is higher, so that the product is not favorable for mixing, diluting, storing and using.
6. The preparation method adopts an emulsion copolymerization method, which comprises the following steps: the viscosity reducer for the oil-based drilling fluid is prepared by amidation reaction and alkylation reaction of organic acid, aminophenol and epoxy monomer, wherein the organic acid provides lipophilic groups to ensure that a product is better dissolved and dispersed in an oil phase of the oil-based drilling fluid, and the existence of the lipophilic groups and chains enables the viscosity reducer for the oil-based drilling fluid to be better adsorbed on lipophilic surfaces such as asphaltene and the like to block the aggregation, bonding and adhesion of lipophilic solid phases, so that the space friction resistance and space structural force are reduced, and the viscosity and the shearing force are further reduced; the aminophenol provides a rigid group to provide the temperature resistance and high-temperature stability of the reaction product; the epoxy monomer provides ether bonds in the molecular chain of the reaction product, so that the oil-based drilling fluid viscosity reducer can be better adsorbed on the surface of a hydrophilic solid-phase substance such as rock debris, and the aggregation, bonding and adhesion of the hydrophilic solid-phase substance in the oil-based drilling fluid are hindered, so that the space friction and the space structural force are reduced, and the viscosity and the shear force are further reduced.
7. The viscosity reducer is used for system viscosity reduction and cutting in the drilling operation and old slurry treatment processes of the oil-based drilling fluid, has high viscosity reduction and cutting efficiency, obviously reduces the plastic viscosity and the dynamic shear force of the oil-based drilling fluid, does not influence the electrical stability of the oil-based drilling fluid, and is convenient to add and use on site.
Detailed Description
The invention provides a viscosity reducer for an oil-based drilling fluid, which comprises the following components in parts by mass:
25-40 parts of organic acid, 10-30 parts of aminophenol, 5-10 parts of epoxy monomer and 40 parts of solvent oil.
The organic acid is one or more of naphthenic acid, tea oil oleic acid, cinnamic acid, palmitoleic acid and coconut oleic acid which are mixed according to any proportion.
The aminophenol is one of p-aminophenol and o-aminophenol or two of p-aminophenol and o-aminophenol which are mixed according to any proportion.
The epoxy monomer is one or more of ethylene oxide, propylene oxide and butylene oxide which are mixed according to any proportion.
The solvent oil is industrial white oil, and is one of 3# white oil and 5# white oil or two mixed in any proportion.
In addition, the invention also provides a method for preparing the viscosity reducer for the oil-based drilling fluid, which comprises the following steps:
step 1: adding 50 parts of benzene into 50 parts of organic acid, aminophenol and benzene, uniformly mixing, and replacing air in the reaction kettle with nitrogen for 1-2 hours under a stirring state.
Step 2: firstly heating the mixture obtained in the step 1 to 80-90 ℃, reacting for 2-3 hours, then heating to 90-100 ℃, and evaporating generated water and benzene.
And 3, step 3: and (3) cooling the mixture obtained in the step (2) to room temperature, adding 0.2 part of sodium hydroxide aqueous solution with the mass fraction of 1% into the reaction kettle, fully mixing, performing vacuum dehydration, and replacing with nitrogen.
And 4, step 4: and (3) heating the mixture obtained in the step (3) to 140-160 ℃, slowly injecting the epoxy monomer into the reaction kettle at a speed of 5 parts per hour through a pipeline, strictly controlling the injection speed, then maintaining the conditions of the temperature of the reaction kettle of 140-160 ℃ and the pressure of 0.3-0.6 MPa for reaction, and controlling the reaction time to be 4-8 hours.
And 5: and after the reaction time is reached, cooling the reaction kettle and the materials to 50-60 ℃, injecting solvent oil through a pipeline, and mixing and stirring uniformly to obtain the viscosity reducer for the oil-based drilling fluid.
The present invention will be further described with reference to the following examples.
Example 1
The embodiment provides a viscosity reducer for an oil-based drilling fluid, which comprises the following components in parts by mass:
25 parts of organic acid, 30 parts of p-aminophenol, 6 parts of epoxy monomer and 40 parts of solvent oil.
Wherein the organic acid is naphthenic acid, the aminophenol is p-aminophenol, the epoxy monomer is ethylene oxide, and the solvent oil is 3# white oil.
In addition, the embodiment also provides a method for preparing the viscosity reducer for the oil-based drilling fluid, which comprises the following steps:
step 1: adding 25g of naphthenic acid, 30g of p-aminophenol and 50g of benzene into a reaction kettle, uniformly mixing, and replacing air in the reaction kettle with nitrogen for 1-2 hours under a stirring state.
Step 2: heating to 80-90 deg.c, reacting for 2-3 hr, heating to 90-100 deg.c and evaporating to obtain water and benzene.
And 3, step 3: cooling to room temperature, adding 0.2g of sodium hydroxide aqueous solution with the mass fraction of 1% into the reaction kettle, fully mixing, performing vacuum dehydration, and performing nitrogen replacement.
And 4, step 4: heating to 140-160 ℃, slowly injecting 6g of ethylene oxide into the reaction kettle through a pipeline, strictly controlling the injection speed, maintaining the temperature of the reaction kettle to be 140-160 ℃, the pressure to be 0.3-0.6 MPa, and controlling the reaction time to be 4-8 hours.
And 5: and after the reaction time is reached, cooling the reaction kettle and the materials to 50-60 ℃, injecting 40g 3# white oil through a pipeline, and mixing and stirring uniformly to obtain the oil-based drilling fluid viscosity reducer.
Example 2
The embodiment provides a viscosity reducer for an oil-based drilling fluid, which comprises the following components in parts by mass:
30 parts of organic acid, 27 parts of p-aminophenol, 5 parts of epoxy monomer and 40 parts of solvent oil.
Wherein the organic acid is tea oil oleic acid, the aminophenol is p-aminophenol, the epoxy monomer is ethylene oxide, and the solvent oil is 3# white oil.
In addition, the embodiment also provides a method for preparing the viscosity reducer for the oil-based drilling fluid, which comprises the following steps:
step 1: 30g of tea oil oleic acid, 27g of p-aminophenol and 50g of benzene are added into a reaction kettle, are uniformly mixed, and the air in the reaction kettle is replaced by nitrogen for 1 to 2 hours under the stirring state.
Step 2: heating to 80-90 deg.c, reacting for 2-3 hr, heating to 90-100 deg.c and evaporating to obtain water and benzene.
And 3, step 3: cooling to room temperature, adding 0.2g of sodium hydroxide aqueous solution with the mass fraction of 1% into the reaction kettle, fully mixing, performing vacuum dehydration, and performing nitrogen replacement.
And 4, step 4: heating to 140-160 ℃, slowly injecting 5g of ethylene oxide into the reaction kettle through a pipeline, strictly controlling the injection speed, maintaining the temperature of the reaction kettle to 140-160 ℃, the pressure to be 0.3-0.6 MPa, and controlling the reaction time to be 4-8 hours.
And 5: and after the reaction time is reached, cooling the reaction kettle and the materials to 50-60 ℃, injecting 40g 3# white oil through a pipeline, and mixing and stirring uniformly to obtain the oil-based drilling fluid viscosity reducer.
Example 3
The embodiment provides a viscosity reducer for an oil-based drilling fluid, which comprises the following components in parts by mass:
33 parts of organic acid, 26 parts of p-aminophenol, 7.6 parts of epoxy monomer and 40 parts of solvent oil.
Wherein the organic acid is cinnamic acid, the aminophenol is p-aminophenol, the epoxy monomer is propylene oxide, and the solvent oil is 3# white oil.
In addition, the embodiment also provides a method for preparing the viscosity reducer for the oil-based drilling fluid, which comprises the following steps:
step 1: adding 33g of cinnamic acid, 26g of p-aminophenol and 50g of benzene into a reaction kettle, uniformly mixing, and replacing air in the reaction kettle with nitrogen for 1-2 hours under the stirring state.
Step 2: heating to 80-90 deg.C, reacting for 2-3 h, heating to 90-100 deg.C, and evaporating out water and benzene.
And 3, step 3: cooling to room temperature, adding 0.2g of sodium hydroxide aqueous solution with the mass fraction of 1% into the reaction kettle, fully mixing, performing vacuum dehydration, and performing nitrogen replacement.
And 4, step 4: heating to 140-160 ℃, slowly injecting 7.6g of propylene oxide into the reaction kettle through a pipeline, strictly controlling the injection speed, maintaining the temperature of the reaction kettle to be 140-160 ℃, the pressure to be 0.3-0.6 MPa, and controlling the reaction time to be 4-8 hours.
And 5: and after the reaction time is reached, cooling the reaction kettle and the materials to 50-60 ℃, injecting 40g 3# white oil through a pipeline, and mixing and stirring uniformly to obtain the oil-based drilling fluid viscosity reducer.
Example 4
The embodiment provides a viscosity reducer for an oil-based drilling fluid, which comprises the following components in parts by mass:
37 parts of organic acid, 20 parts of aminophenol, 8 parts of epoxy monomer and 40 parts of solvent oil.
Wherein the organic acid is palmitoleic acid, the aminophenol is ortho-aminophenol, the epoxy monomer is propylene oxide, and the solvent oil is 3# white oil.
In addition, the embodiment also provides a method for preparing the viscosity reducer for the oil-based drilling fluid, which comprises the following steps:
step 1: adding 37g of palmitoleic acid, 20g of o-aminophenol and 50g of benzene into a reaction kettle, uniformly mixing, and replacing air in the reaction kettle with nitrogen for 1-2 hours under a stirring state.
Step 2: heating to 80-90 deg.c, reacting for 2-3 hr, heating to 90-100 deg.c and evaporating to obtain water and benzene.
And step 3: cooling to room temperature, adding 0.2g of sodium hydroxide aqueous solution with the mass fraction of 1% into the reaction kettle, fully mixing, performing vacuum dehydration, and performing nitrogen replacement.
And 4, step 4: heating to 140-160 ℃, slowly injecting 8g of propylene oxide into the reaction kettle through a pipeline, strictly controlling the injection speed, maintaining the temperature of the reaction kettle to 140-160 ℃, the pressure to be 0.3-0.6 MPa, and controlling the reaction time to be 4-8 hours.
And 5: and after the reaction time is reached, cooling the reaction kettle and the materials to 50-60 ℃, injecting 40g 3# white oil through a pipeline, and mixing and stirring uniformly to obtain the oil-based drilling fluid viscosity reducer.
Example 5
The embodiment provides a viscosity reducer for an oil-based drilling fluid, which comprises the following components in parts by mass:
38 parts of organic acid, 15 parts of aminophenol, 9 parts of epoxy monomer and 40 parts of solvent oil.
Wherein the organic acid is coconut oil acid, the aminophenol is o-aminophenol, the epoxy monomer is butylene oxide, and the solvent oil is 3# white oil.
In addition, the embodiment also provides a method for preparing the viscosity reducer for the oil-based drilling fluid, which comprises the following steps:
step 1: adding 38g of coconut oleic acid, 15g of o-aminophenol and 50g of benzene into a reaction kettle, uniformly mixing, and replacing air in the reaction kettle with nitrogen for 1-2 hours under the stirring state.
And 2, step: heating to 80-90 deg.c, reacting for 2-3 hr, heating to 90-100 deg.c and evaporating to obtain water and benzene.
And 3, step 3: cooling to room temperature, adding 0.2g of sodium hydroxide aqueous solution with the mass fraction of 1% into the reaction kettle, fully mixing, performing vacuum dehydration, and performing nitrogen replacement.
And 4, step 4: heating to 140-160 ℃, slowly injecting 9g of butylene oxide into the reaction kettle through a pipeline, strictly controlling the injection speed, maintaining the temperature of the reaction kettle to 140-160 ℃, the pressure to be 0.3-0.6 MPa, and controlling the reaction time to be 4-8 hours.
And 5: and after the reaction time is reached, cooling the reaction kettle and the materials to 50-60 ℃, injecting 40g 3# white oil through a pipeline, and mixing and stirring uniformly to obtain the oil-based drilling fluid viscosity reducer.
Example 6
The embodiment provides a viscosity reducer for an oil-based drilling fluid, which comprises the following components in parts by mass:
40 parts of organic acid, 10 parts of aminophenol, 10 parts of epoxy monomer and 40 parts of solvent oil.
Wherein the organic acid is palmitoleic acid, the aminophenol is ortho-aminophenol, the epoxy monomer is butylene oxide, and the solvent oil is 5# white oil.
In addition, the embodiment also provides a method for preparing the viscosity reducer for the oil-based drilling fluid, which comprises the following steps:
step 1: adding 40g of palmitoleic acid, 10g of o-aminophenol and 50g of benzene into a reaction kettle, uniformly mixing, and replacing air in the reaction kettle with nitrogen for 1-2 hours under a stirring state.
And 2, step: heating to 80-90 deg.C, reacting for 2-3 h, heating to 90-100 deg.C, and evaporating out water and benzene.
And step 3: cooling to room temperature, adding 0.2g of sodium hydroxide aqueous solution with the mass fraction of 1% into the reaction kettle, fully mixing, performing vacuum dehydration, and performing nitrogen replacement.
And 4, step 4: heating to 140-160 ℃, slowly injecting 10g of butylene oxide into the reaction kettle through a pipeline, strictly controlling the injection speed, maintaining the temperature of the reaction kettle to be 140-160 ℃, the pressure to be 0.3-0.6 MPa, and controlling the reaction time to be 4-8 hours.
And 5: and after the reaction time is reached, cooling the reaction kettle and the materials to 50-60 ℃, injecting 40g No. 5 white oil through a pipeline, and mixing and stirring uniformly to obtain the oil-based drilling fluid viscosity reducer.
Comparative example 1
The only difference from example 1 is that no organic acid was added in this comparative example.
Comparative example 2
The only difference from example 1 is that this comparative example does not incorporate an epoxy monomer.
Comparative example 3
The only difference from example 1 is that this comparative example does not add aminophenol.
The viscosity reducer of the invention and the viscosity reducer of the comparative example were evaluated by separately formulating an oil-based drilling fluid as follows:
1. preparing an oil-based drilling fluid:
adding the viscosity reducer for the oil-based drilling fluid into an oil-based drilling fluid system, fully stirring and uniformly mixing by using a high-speed stirrer to obtain an evaluation drilling fluid sample, aging for 48 hours at the high temperature of 150 ℃, and measuring the plastic viscosity PV, the dynamic shear force YP and the electric stability parameter demulsification voltage Es of the oil-based drilling fluid.
2. The viscosity reducer for the oil-based drilling fluid comprises the following instruments and equipment for evaluating:
the used test instruments comprise a precision electronic scale (the precision is 0.01 g), a ZNN-D6 type six-speed rotational viscometer (Qingdao Oster oil technology, inc.), a GJSS-B12K type variable frequency high-speed stirrer (Qingdao Oster oil technology, inc.), an XGRL-4A digital display roller heating furnace (Qingdao Oster oil technology, inc.), and a Fann demulsification voltage tester (Fann Instrument Company).
3. The formula of the oil-based drilling fluid comprises the following components:
270ml of No. 3 white oil, 30ml of 28% calcium chloride salt water, 9g of organic soil MOGEL, 9g of main emulsifier MOEMUL-S, 6g of auxiliary emulsifier MOMOCAT-S, 30g of fluid loss additive MOTEX, 9g of calcium oxide (analytical pure), 150g of first-grade sodium soil and 800g of barite (industrial grade).
4. The preparation method of the oil-based drilling fluid comprises the following steps:
(1) Adding a main emulsifier MOEMUL-S and an auxiliary emulsifier MOMOCAT-S into 3# white oil, mixing for 5min at the rotating speed of 10000 r/min, adding 28% calcium chloride brine, stirring for 30min, adding organic soil, stirring for 10 min, adding a fluid loss additive MOTEX and calcium oxide, stirring for 20min, adding barite, stirring for 30min, adding primary sodium-like soil, and stirring for 30min to obtain the primary oil-based drilling fluid stock.
(2) And (2) hot rolling the oil-based drilling fluid raw stock obtained in the step (1) at the temperature of 150 ℃ for 48h, and stirring at the rotating speed of 10000 r/min for 20min to obtain the oil-based drilling fluid base stock.
(3) And (2) adding 15g of viscosity reducer for oil-based drilling fluid into the raw stock of oil-based drilling fluid obtained in the step (1), stirring for 30min, then hot rolling for 48h at the temperature of 150 ℃, and then stirring for 20min at the rotating speed of 10000 r/min to obtain sample stock of oil-based drilling fluid.
5. The oil-based drilling fluids provided in examples 1-6 and comparative examples 1-3 were subjected to performance testing, as follows:
the oil-based drilling fluid performance rheological property evaluation experiment step comprises:
heating the oil-based drilling fluid to 50 ℃ by using a water bath kettle, measuring the rheological parameters of the oil-based drilling fluid at the temperature of 50 ℃ by using a six-speed rotational viscometer, and calculating to obtain the plastic viscosity and the dynamic shear force parameters as shown in the following table.
The oil-based drilling fluid electrical stability evaluation experiment step:
heating the oil-based drilling fluid to 50 ℃ by using a water bath kettle, measuring the electrical stability of the oil-based drilling fluid at the temperature of 50 ℃ by using a Fann type demulsification voltage instrument, and recording and measuring to obtain the demulsification voltage value parameters shown in the following table.
According to the experimental data, the following results are shown: compared with the blank oil-based drilling fluid, after the viscosity reducer for the oil-based drilling fluid is used, the plastic viscosity and the dynamic shear force of the system are obviously reduced, and the influence on the electrical stability is small.
Where mentioned above are merely embodiments of the present invention, any feature disclosed in this specification may, unless stated otherwise, be replaced by alternative features serving equivalent or similar purposes; all of the disclosed features, or all of the method or process steps, may be combined in any combination, except mutually exclusive features and/or steps.
Claims (10)
1. The viscosity reducer for the oil-based drilling fluid is characterized by comprising the following components in parts by mass:
25-40 parts of organic acid, 10-30 parts of aminophenol, 5-10 parts of epoxy monomer and 40 parts of solvent oil.
2. The viscosity reducer for oil-based drilling fluids according to claim 1, wherein: the organic acid is one or more of naphthenic acid, tea oil oleic acid, cinnamic acid, palmitoleic acid and coconut oil oleic acid which are mixed according to any proportion.
3. The viscosity reducer for oil-based drilling fluids according to claim 1, wherein: the aminophenol is one of p-aminophenol and o-aminophenol or two of p-aminophenol and o-aminophenol which are mixed according to any proportion.
4. The viscosity reducer for oil-based drilling fluids according to claim 1, wherein: the epoxy monomer is one or more of ethylene oxide, propylene oxide and butylene oxide which are mixed according to any proportion.
5. The viscosity reducer for oil-based drilling fluids according to claim 1, wherein: the solvent oil is industrial white oil, and is one of 3# white oil and 5# white oil or two mixed in any proportion.
6. A method for producing the viscosity reducer for oil-based drilling fluids according to any one of claims 1 to 5, comprising the steps of:
step 1: adding organic acid, aminophenol and benzene into a reaction kettle, uniformly mixing, and replacing air in the reaction kettle with nitrogen for 1-2 hours under a stirring state;
and 2, step: heating the mixture obtained in the step 1 to 80-90 ℃, reacting for 2-3 hours, heating to 90-100 ℃, and evaporating generated water and benzene;
and step 3: cooling the mixture obtained in the step 2 to room temperature, adding a sodium hydroxide aqueous solution with the mass fraction of 1% into a reaction kettle, fully mixing, performing vacuum dehydration, and performing nitrogen replacement;
and 4, step 4: heating the mixture obtained in the step (3) to 140-160 ℃, injecting an epoxy monomer into the reaction kettle, and controlling the reaction time to be 4-8 hours;
and 5: and after the reaction time is reached, cooling the reaction kettle and the materials to 50-60 ℃, injecting solvent oil through a pipeline, and mixing and stirring uniformly to obtain the viscosity reducer for the oil-based drilling fluid.
7. The method for preparing the viscosity reducer for the oil-based drilling fluid according to claim 6, wherein the viscosity reducer comprises the following steps: in step 1, 50 parts of benzene are added.
8. The method for preparing the viscosity reducer for the oil-based drilling fluid according to claim 6, wherein the viscosity reducer comprises the following steps: in step 2, 0.2 part of an aqueous sodium hydroxide solution was added.
9. The method for preparing the viscosity reducer for the oil-based drilling fluid according to claim 6, wherein the viscosity reducer comprises the following steps: in step 4, the epoxy monomer is injected into the reaction kettle through a pipeline, and the injection speed is 5 parts per hour.
10. The method for preparing the viscosity reducer for the oil-based drilling fluid according to claim 6, wherein the viscosity reducer comprises the following steps: in step 4, after the epoxy monomer is injected into the reaction kettle, the reaction is carried out under the conditions that the temperature of the reaction kettle is 140-160 ℃ and the pressure is 0.3-0.6 MPa.
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