CN103013466B - Solid paraffin lubricant for drilling fluid and preparation method of solid paraffin lubricant - Google Patents
Solid paraffin lubricant for drilling fluid and preparation method of solid paraffin lubricant Download PDFInfo
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Abstract
The invention relates to a solid paraffin lubricant for drilling fluid and a preparation method of the solid paraffin lubricant. The preparation method comprises the following steps of respectively adding oil phase, sodium hydroxide, a compound emulsifier, a stabilizer and a water phase in a reactor, heating and stirring, so as to obtain a liquid emulsified paraffin lubricant; immersing the prepared liquid paraffin lubricant in a characteristic water soluble high molecular material by using a semi-dry method, drying at low temperature, and crushing, so as to obtain the solid paraffin lubricant for drilling fluid. The lubricant product obtained according to the method provided by the invention has the characteristics of high drilling fluid dispersion speed, small particles and excellent composite lubricating effect. Compared with the traditional emulsion type paraffin lubricant, the solid paraffin lubricant provided by the invention has higher overall performances such as lubricating property, high temperature resistance, filtrate loss reducing property and salt resistance, and is convenient to store and transport, thus packaging and transporting costs are reduced but also the problems of emulsion instability of the traditional paraffin lubricant after being stored for a long time and freezing in winter are solved.
Description
Technical field
The present invention relates to a kind of lubricant and preparation method thereof, relate in particular to solid paraffin lubricant and preparation method thereof for a kind of drilling fluid.
Background technology
Lubricate and sticking control problem in drilling process is drilling engineering, the technical barrier particularly often running in the Holes of Complicated Wells drilling well such as deep-well, orientation well, horizontal well, multilateral well.Lubricant for drilling fluid is as a kind of important drilling fluid chemical processing agent, and its effect is the lubricity of improving drilling fluid, reduces the friction between drilling tool and the borehole wall (or sleeve pipe), reduces drill string rotating moment of torsion and the resistance that makes a trip, and reduces the generation of lock of tool drilling.
In recent years, along with development and the raising of deep-well, orientation well and horizontal well drilling technology, more and more higher to the requirement of lubricant for drilling fluid performance, the lubricant kind of use and quantity are also more and more.Lubricant in outer row's rejected well drilling liquid is poisonous and hazardous a bit, also has quite a few under field conditions (factors) compared with difficult degradation, causes thus this class material long-term delay and accumulation in environment, and the mankind and ecotope are constituted a threat to.Along with the enhancing of environmental consciousness, people's attaching importance to environmental protection more and more when development of new lubricant for drilling fluid also requires as far as possible without fluorescence or low fluorescence simultaneously, and drilling fluid rheology, without impact, is further improved to high-temperature resisting and salt-resisting ability.
Crude oil in China majority is paraffinic crude, and this is just for the production of development paraffin class product provides abundant and valuable resource.Eighties of last century fifties, Mobil Oil Corp.'s exploitation emulsified olefin that begins one's study, the seventies, Britain, Japan also begin one's study and using emulsion paraffin.In recent years, the domestic research that also starts a large amount of this respects.
Drilling fluid can be divided into liquid type and solid kind with paraffin lubricant according to form.The research of emulsion-type paraffin lubricant is relatively many, in recent years, about the research of solid type lubricant for drilling fluid, also has much, but still there is no disclosed technical literature and patent about solid powdery paraffin lubricant.
Patent CN 1306012C, CN 101423752A, CN 1699500A disclose several technological methods of preparing emulsion-type paraffin lubricant, but the problems such as long-time storage is unstable, easily freeze winter that emulsion type products all exists, are restricted rig-site utilization.
For example CN 101157850, adopt animal-plant oil to prepare liquid lubricant, then liquid and oil-soluble resin, graphite are mixed to get to high temperature resistant lubricant for drilling liquid, and its oilness is better; Patent US 5826669 by adding sufficient whippy graphite granule in drilling fluid, designed a kind of lubricant that effectively reduces make a trip resistance and rotary torque, but graphite is difficult to reach requirement as lubricating oil absorption carrier for the higher marine drilling of environmental requirement, and almost there is no filtrate loss controllability.
Patent CN 1861736A has announced a kind of method of utilizing sodium bentonite carrier surface promoting agent to prepare solid lubricant for well drilling liquid, but it is composite that it needs to add diesel oil to carry out scene in use, use inconvenience, and diesel oil fluorescence is very strong, well logging is produced and disturbed.In addition, patent CN 1183231C utilizes cooling down moulding after melt paraffin and surfactivity blend, has invented a kind of solid self-emulsifying paraffin, although solved the accumulating problem of product, but paraffin solid need to dissolve emulsification in hot water, and do not there is the effect of potion multiple-effect.
Therefore, develop under a kind of applicable cold condition that to use, have the low fluorescence non-toxic solid lubricant product of potion multiple-effect effect significant for oil drilling.
Summary of the invention
Deficiency for existing research, the problem to be solved in the present invention be to provide a kind of drilling fluid with solid paraffin lubricant with and preparation method thereof, utilize the solid lubricant that the inventive method obtains to there is good dispersity in drilling fluid, comprehensive lubricity is good, sticking coefficient and the high feature of coefficient of friction resistance reduced rate have good high-temperature resisting and salt-resisting filtration reduction simultaneously.In addition, preparation method of the present invention is simple, and technique is easy to realize, and prepared solid lubricant state is free flowing powder solid, convenient transport, and low temperature use properties is unaffected.
Therefore, according to first aspect present invention, provide the preparation method of a kind of drilling fluid with solid paraffin lubricant, it comprises the following steps:
(1) take following weight proportion component: oil phase 20-50 part, sodium hydroxide 0.5-2 part, compound emulsifying agent 1-10 part, stablizer 0.1-1 part, water 37-78.4 part;
(2) above-mentioned oil phase, sodium hydroxide, compound emulsifying agent, stablizer and water are mixed and added in reactor by described component ratio, under 70-100 ℃, 100-2000 rev/min condition, stir 15-60min, make liquid lubricant;
(3) take following weight proportion component: characteristic macromolecular material 50-80 part, the liquid lubricant 20-50 part obtaining in step (2);
(4) aforesaid liquid lubricant is invaded to soak by described component ratio with characteristic polymer react;
(5) through 60-100 ℃ of oven drying at low temperature, disintegrating process, obtain solid lubricant for well drilling liquid;
Wherein:
Described oil phase is mineral oil and waxy substance;
Described compound emulsifying agent is polyvalent alcohol lipid nonionogenic tenside;
Described stablizer is inorganic nano-particle;
Described characteristic macromolecular material is to have the water-soluble high-molecular material that falls leak-off effect.
In the preparation method of above-mentioned drilling fluid with solid paraffin lubricant, described mineral oil is whiteruss, 7# white oil, 10# white oil, 15# white oil, 26# white oil or 46# white oil; Further preferred 46# white oil.
Described waxy substance is paraffin, slack wax, vegetable wax, wax-pattern recycling wax, paraffin removal from oil well operation recycling wax; Further preferred slack wax, since the easier emulsification of slack wax, the emulsion stable homogeneous preparing.
The preferred Sp an of described polyvalent alcohol lipid nonionogenic tenside and Tween series of surfactants; Further preferred Sp an20, Sp an40, Sp an 60 or Span80 and Tween20, Tween40, Tween60 or Tween80; Most preferably Span80 and Tween80.
Described fatty acid alkyl amide class assistant for emulsifying agent preferred fatty acid and trolamine direct reaction product.
The mixture of the preferred white carbon black of described inorganic nano-particle stablizer, calcium carbonate superfine powder, bentonite gel, attapulgite gel or its arbitrary proportion; Further preferred white carbon black and attapulgite gel.
In the preparation method of above-mentioned drilling fluid with solid paraffin lubricant, in step (2), described component is preferably with 80-100 ℃, 200-500 rev/min condition stirring 20-40min.
Described have the preferred silicone oil graft starch of characteristic water-soluble high-molecular material (SiM), cellulose graft starch (PPS), a polyacrylonitrile ammonium salt (NH that falls leak-off effect
4pAN), poly-(vinyl cyanide-acrylamide) ammonium salt (double focusing ammonium salt) (HMP-21), the mixture of valchovite (SPNH), sulfonated lignite (SMC) or its arbitrary proportion; Further preferred PPS, because PPS is filamentary structure, can invade wherein oil-in-water-type paraffin wax emulsions particle, through semidry process, oven dry, pulverizes and obtains the good solid lubricant of lubricity.
In the preparation method of above-mentioned drilling fluid with solid paraffin lubricant, the described component of step (5) is preferably dried with 70-90 ℃ of condition.
According to second aspect present invention, a kind of drilling fluid making according to aforesaid method solid paraffin lubricant is provided, it is characterized in that, the component that described solid lubricant comprises following weight proportion: characteristic macromolecular material 50-80 part, preferred 55-75 part, liquid lubricant 20-50 part, preferably 25-45 part; Wherein:
The component that described liquid lubricant comprises following weight proportion: oil phase 30-50 part, sodium hydroxide 0.5-2 part, compound emulsifying agent 2-6 part, stablizer 0.1-1 part, water 41-67.4 part, based on 100 weight part liquid lubricants;
Wherein:
Described oil phase is mineral oil and waxy substance;
Described compound emulsifying agent is polyvalent alcohol lipid nonionogenic tenside;
Described stablizer is inorganic nano-particle;
Described characteristic macromolecular material is to have the water-soluble high-molecular material that falls leak-off effect.
According to the preferred embodiment of the present invention, described drilling fluid is with in solid paraffin lubricant, and characteristic macromolecular material is 60-70 weight part, and liquid lubricant is 30-40 weight part.
According to the preferred embodiment of the present invention, described drilling fluid is with in solid paraffin lubricant, the component that described liquid lubricant comprises following weight proportion: oil phase 40-45 part, sodium hydroxide 0.8-1 part, compound emulsifying agent 3-5 part, stablizer 0.5-0.8 part, water 48.2-55.7 part, based on 100 weight part liquid lubricants.
According to the preferred embodiment of the present invention, described drilling fluid is used in solid paraffin lubricant, the preferred 46# white oil of described mineral oil; And/or the preferred slack wax of described waxy substance; The preferred Sp an80 of described polyvalent alcohol lipid nonionogenic tenside and Twe en80; And/or the preferred white carbon black of described inorganic nano-particle stablizer and attapulgite gel; And/or described in there is the preferred PP S of characteristic water-soluble high-molecular material that falls leak-off effect.
The drilling fluid that the method for the invention makes is light brown pressed powder by solid paraffin lubricant outward appearance, free from extraneous odour, and lubricant is scattered in drilling fluid for receiving micron-scale particle.
Drilling fluid of the present invention solid paraffin lubricant, sticking coefficient reduced rate and coefficient of friction resistance reduced rate all can be controlled in 55%-90%, and comprehensive lubricity is better.
The present invention's beneficial effect is compared with prior art:
(1) the easier emulsification of the slack wax of one of raw material, the emulsion stable homogeneous preparing; The PPS of one of characteristic water-soluble high-molecular material is filamentary structure, and oil-in-water-type paraffin wax emulsions particle can be immersed, and through semidry process, oven dry, pulverizes and obtains the good solid lubricant of lubricity.
(2) there is good comprehensive lubricity, can effectively reduce sticking coefficient and the coefficient of friction resistance of drilling fluid base slurry, play the effect of lubricated drilling tool and the borehole wall.
(3) can in the borehole wall, form oil film protective layer, stop drilling fluid and filtrate thereof to enter stratum, crack, shutoff stratum, prevents slump in, has the performance of good protection oil bearing reservoir.
(4) have good high temperature resistance, salt resistance, easily dispersion, low fluorescence, hypotoxicity, meet the requirement of environment protection.
(5) have good High Temperature High Pressure filtrate loss controllability, 4% brine mud, 120 ℃, the High Temperature High Pressure decline leak-off rate of 3.5MPa pressure reduction reach more than 50%.
(6) cold condition is used unaffectedly, effectively prevents that traditional liquid paraffin lubricant from storing layering and solidify with winter and easily freeze because of long-time, has transportation and stores conveniently, saves and packs and the feature of transportation cost.
Accompanying drawing explanation
Fig. 1: the influence degree of the different dosages of solid paraffin lubricant to base slurry sticking coefficient reduced rate and coefficient of friction resistance reduced rate;
Fig. 2: the stereoscan photograph contrast of characteristic macromolecular material and solid paraffin lubricant: (a) characteristic polymer; (b) solid paraffin lubricant of the present invention;
Fig. 3: solid paraffin lubricant Laser particle-size distribution figure.
Embodiment
Further explain and describe by the following examples content of the present invention.But the embodiment providing should not be understood to protection domain of the present invention to be construed as limiting.
performance evaluation
The sticking coefficient reduced rate of the lubricant the present invention relates to, coefficient of friction resistance reduced rate, High Temperature High Pressure filtration reduction experiments of measuring are as follows:
1, sticking coefficient reduced rate is measured:
In 500mL distilled water, add the calcareous sodium-ionized bentonite of 26g, on high speed agitator with the rotating speed high-speed stirring 20min of 10000 revs/min, the airtight ageing 16h of room temperature then, obtaining containing soil amount is 5.2% fresh water-based slurry.During measurement, the 5.2% fresh water-based slurry of ageing 16h is added to lubricant by certain proportioning, high-speed stirring 20min, measures and adopts NF-1 type sticking coefficient determinator.The mud configuring poured in liquid holding cup, added the pressure 30min of 3.5MPa, then measure filter loss now, and the pressure that adds 3.5MPa coils in adhesion, press 5min after torque meter measure moment of torsion, then calculate, calculation formula is as follows:
f=M×0.845×10
-2
In formula: f is that sticking coefficient M is moment of torsion (Nm)
The calculating of sticking coefficient reduced rate:
△K
f＝（f
1－f
2）/f
1×100％
In formula: f
1for the sticking coefficient of base slurry itself, f
2for adding the sticking coefficient of mud after certain content lubricant.
2, coefficient of friction resistance reduced rate is measured:
In 500mL distilled water, add the calcareous sodium-ionized bentonite of 26g, on high speed agitator with the rotating speed high-speed stirring 20min of 10000 revs/min, the airtight ageing 16h of room temperature then, obtaining containing soil amount is 5.2% fresh water-based slurry.Adopt E-P extreme boundary lubrication instrument to measure base slurry, distilled water and base slurry and add the coefficient of friction resistance after lubricant, 5.2% fresh water-based slurry of ageing is added to lubricant by certain proportioning, adopt GJ-2S type homogenizer high-speed stirring 5min, liquid is poured in lubricity tester sample cup, test condition is 60r/min, test pressure is 1.5MPa, and the test duration is 5min, reading after 5min.Correction factor=34/ distilled water reading, coefficient of friction resistance f=0.01 * reading * correction factor.
△f=（f
1－f
2）/f
1×100％
In formula: f
1for the coefficient of friction resistance of base slurry itself, f
2for adding the coefficient of friction resistance of mud after certain content lubricant.
3, high temperature and high pre ssure filtration:
(1) fresh water-based slurry: add the calcareous sodium-ionized bentonite of 24g in 400mL deionized water, with the rotating speed high-speed stirring 20min of 10000 revs/min, then the airtight ageing 16h of room temperature, obtains 6.0% fresh water-based slurry on high speed agitator.During measurement, the base slurry of ageing 16h is added to lubricant by certain proportioning, high-speed stirring 20min, measures and adopts GGS 42-2 type high pressure high temperature filter tester.The mud configuring is poured in pressure filter, pressurization 3.5Mp a, be warming up to 120 ℃, timing when opening top and the bottom valve rod, records the filtrate filter loss of 30min.
Percentage of water loss=(V falls in High Temperature High Pressure
1-V
2)/V
1* 100%
In formula: V
1for the filter loss of the filtrate of base slurry itself, V
2for adding the filter loss of filtrate after certain content lubricant.
(2) brine mud: add 16gNa Cl in 400mL deionized water, 10000 revs/min of high-speed stirring 20min, add again the calcareous sodium-ionized bentonite of 24g, on high speed agitator with the rotating speed high-speed stirring 20min of 10000 revs/min, then the airtight ageing 16h of room temperature, obtaining containing soil amount is 6.0% brine mud.During measurement, the base slurry of ageing 16h is added to lubricant by certain proportioning, high-speed stirring 20min, measures and adopts GGS42-2 type high pressure high temperature filter tester.The mud configuring is poured in pressure filter, pressurization 3.5Mpa, be warming up to 120 ℃, timing when opening top and the bottom valve rod, records the filtrate filter loss of 30min.
Percentage of water loss=(V falls in High Temperature High Pressure
1-V
2)/V
1* 100%
In formula: V
1for the filter loss of the filtrate of base slurry itself, V
2for adding the filter loss of filtrate after certain content lubricant.
embodiment 1
Lubricant composition is as follows: be weight part (unit: kilogram):
22.5 parts of white oils, 22.5 parts of slack waxs, 1 part, sodium hydroxide, nonionic surface active agent Span 80 and Tween804.7 part, 0.3 part of white carbon black, 49 parts of distilled water.
35 parts of characteristic water soluble macromolecular PPS, get 65 parts of the above-mentioned liquid lubricants preparing.
Preparation method: 49 parts of 22.5 parts of white oils, 22.5 parts of slack waxs, nonionic surface active agent Span 80 and Tween804.7 part, 0.3 part of white carbon black, distilled water are mixed in reactor, 85 ℃, 300 revs/min conditions continue to stir 20min, obtain drilling fluid liquid lubricant.Get 65 parts of the above-mentioned lubricants making and mix with 35 parts of PP S, under 80 ℃ of conditions, evenly invade and soak, 80 ℃ of oven drying at low temperatures are pulverized, and obtain drilling fluid solid paraffin lubricant.
According to the said products method of evaluating performance, respectively the solid paraffin lubricant product of embodiment 1 and two kinds of commercially available emulsion-types and solid type lubricant to be evaluated, result is as shown in Table 1.
The comprehensive lubricity comparative evaluation's result of table one embodiment product (5.2% fresh water bentonite base slurry)
Fig. 1 is the influence degree graphic representations of the different dosages of prepared solid paraffin lubricant to base slurry sticking coefficient reduced rate and coefficient of friction resistance reduced rate.
embodiment 2
Substantially as described in Example 1, difference is method:
Lubricant composition is as follows, is weight part (unit: kilogram):
20 parts of white oils, 20 parts of slack waxs, 1 part, sodium hydroxide, 805 parts of nonionic surface active agent Span80 and Tween, 0.5 part of calcium carbonate superfine powder, 53.5 parts of distilled water.
30 parts of characteristic polymer PPS, get 70 parts of the above-mentioned liquid lubricants preparing.
Preparation method: said components is mixed in reactor, and 75 ℃, 100 revs/min conditions continue to stir 60min, obtain drilling fluid liquid lubricant.Get 70 parts of the above-mentioned lubricants making and evenly invade and soak under 70 ℃ of conditions with 30 parts of PPS, 100 ℃ of oven drying at low temperatures are pulverized, and obtain drilling fluid solid paraffin lubricant.
According to the said products method of evaluating performance, respectively the solid paraffin lubricant product of embodiment 2 and two kinds of commercially available emulsion-types and solid type lubricant to be evaluated, result is as shown in Table 2.
Table two embodiment product High Temperature High Pressure filtrate loss controllability comparative evaluation result (6.0% fresh water and salt solution (4.0%) base slurry)
embodiment 3
Method is substantially as described in embodiment 1 or 2, and difference is:
Lubricant composition is as follows: be weight part (unit: kilogram):
20 parts of white oils, 25 parts of slack waxs, 1 part, sodium hydroxide, nonionic surface active agent Span80 and Tween805 part, 0.6 part of attapulgite gel, 48.4 parts of distilled water.
35 parts of characteristic polymer PPS, get 65 parts of the above-mentioned liquid lubricants preparing.
Preparation method: said components is mixed in reactor, and 90 ℃, 2000 revs/min conditions continue to stir 15min, obtain drilling fluid liquid lubricant.Get 65 parts of the above-mentioned lubricants making and evenly invade and soak under 90 ℃ of conditions with 35 parts of PPS, 70 ℃ of oven drying at low temperatures are pulverized, and obtain drilling fluid solid paraffin lubricant.
Fig. 2 is the stereoscan photograph contrast of characteristic macromolecular material and solid paraffin lubricant: (a) characteristic polymer; (b) the solid paraffin lubricant that the present invention makes.As seen from the figure, be distributed as 1～10 μ m level fine particle paraffin particles adhering on characteristic macromolecular material, be convenient to it and play lubrication.
Fig. 3 is the Laser particle-size distribution figure of the solid paraffin lubricant that makes of the present invention.As seen from the figure, load the particle diameter of characteristic macromolecular material after wax grain be mainly distributed in 10 ~ 100 μ m level molecules, be convenient to it and play lubrication.
According to the above embodiments, the present invention is described in detail.It should be noted that, above embodiment is just to illustrating the present invention.Do not departing under the prerequisite of spirit of the present invention and essence, those skilled in the art can design multiple alternative of the present invention and improvement project, within it all should be understood to be in protection scope of the present invention.
Claims (13)
1. a preparation method for solid paraffin lubricant for drilling fluid, it comprises the following steps:
(1) take following weight proportion component: oil phase 20-50 part, sodium hydroxide 0.5-2 part, compound emulsifying agent 1-10 part, stablizer 0.1-1 part, water 37-78.4 part;
(2) above-mentioned oil phase, sodium hydroxide, compound emulsifying agent, stablizer and water are mixed and added in reactor by described component ratio, under 70-100 ℃, 100-2000 rev/min condition, stir 15-60min, make liquid lubricant;
(3) take following weight proportion component: characteristic macromolecular material 50-80 part, liquid lubricant 20-50 part that step (2) obtains;
(4) aforesaid liquid lubricant is invaded to soak by described component ratio with characteristic polymer react;
(5) through 60-100 ℃ of oven drying at low temperature, disintegrating process, obtain solid lubricant for well drilling liquid;
It is characterized in that:
Described oil phase is mineral oil and waxy substance;
Described compound emulsifying agent is polyol ester class nonionogenic tenside;
Described stablizer is inorganic nano-particle, and described inorganic nano-particle is the mixture of white carbon black, calcium carbonate superfine powder, bentonite gel, attapulgite gel or its arbitrary proportion; And/or
Described characteristic macromolecular material is to have the water-soluble high-molecular material that falls leak-off effect, described in to have the water-soluble high-molecular material that falls leak-off effect be silicone oil graft starch, cellulose graft starch, polyacrylonitrile ammonium salt (NH
4pAN), the mixture of poly-(vinyl cyanide-acrylamide) ammonium salt, valchovite (SPNH), sulfonated lignite (SMC) or its arbitrary proportion.
2. according to the preparation method of claim 1, it is characterized in that, described mineral oil is whiteruss, 7# white oil, 10# white oil, 15# white oil, 26# white oil or 46# white oil; And/or described waxy substance is paraffin, slack wax, vegetable wax, wax-pattern recycling wax, paraffin removal from oil well operation recycling wax.
3. according to the preparation method of claim 2, it is characterized in that, described mineral oil is 46# white oil, and described waxy substance is slack wax.
4. according to the preparation method of claim 1 or 2, it is characterized in that, described polyol ester class nonionogenic tenside is Span and Tween series of surfactants.
5. according to the preparation method of claim 4, it is characterized in that, described polyol ester class nonionogenic tenside is Span20, Span40, Span60 or Span80 and Tween20, Tween40, Tween60 or Tween80.
6. according to the preparation method of claim 5, it is characterized in that, described polyol ester class nonionogenic tenside is Span80 and Tween80.
7. according to the preparation method of claim 1 or 2, it is characterized in that, described inorganic nano-particle stablizer is white carbon black and attapulgite gel.
8. according to the preparation method of claim 1 or 2, it is characterized in that, described in to have the characteristic water-soluble high-molecular material that falls leak-off effect be cellulose graft starch.
9. according to the preparation method of claim 1 or 2, it is characterized in that, the described component of step (2) is with 80-100 ℃, 200-500 rev/min condition stirring 20-40min; And/or the described component of step (5) is dried with 70-90 ℃ of condition.
10. the drilling fluid making according to the method for one of claim 1 to 9 solid paraffin lubricant, is characterized in that, described solid lubricant is in 100 weight parts, and component is: characteristic macromolecular material 50-80 part, liquid lubricant 20-50 part; Wherein:
The component that described liquid lubricant comprises following weight proportion: oil phase 30-50 part, sodium hydroxide 0.5-2 part, compound emulsifying agent 2-6 part, stablizer 0.1-1 part, water 41-67.4 part, based on 100 weight part liquid lubricants;
Wherein:
Described oil phase is mineral oil and waxy substance;
Described compound emulsifying agent is polyol ester class nonionogenic tenside;
Described stablizer is inorganic nano-particle, and described inorganic nano-particle is the mixture of white carbon black, calcium carbonate superfine powder, bentonite gel, attapulgite gel or its arbitrary proportion;
Described characteristic macromolecular material is to have the water-soluble high-molecular material that falls leak-off effect, described in there is the mixture that the water-soluble high-molecular material that falls leak-off effect is silicone oil graft starch, cellulose graft starch, polyacrylonitrile ammonium salt (NH4PAN), poly-(vinyl cyanide-acrylamide) ammonium salt, valchovite (SPNH), sulfonated lignite (SMC) or its arbitrary proportion.
11. according to the drilling fluid of claim 10 solid paraffin lubricant, it is characterized in that, described solid lubricant is in 100 weight parts, and component is: characteristic macromolecular material is 55-75 part, and liquid lubricant is 25-45 part.
12. according to the drilling fluid of claim 10 or 11 solid paraffin lubricant, it is characterized in that, described solid lubricant comprises: characteristic macromolecular material 60-70 weight part, liquid lubricant 30-40 weight part; And/or
The component that described liquid lubricant comprises following weight proportion: oil phase 40-45 part, sodium hydroxide 0.8-1 part, compound emulsifying agent 3-5 part, stablizer 0.5-0.8 part, water 48.2-55.7 part, based on 100 weight part liquid lubricants.
13. according to the drilling fluid of claim 10 or 11 solid paraffin lubricant, it is characterized in that, described mineral oil is 46# white oil; And/or described waxy substance is slack wax; Described polyol ester class nonionogenic tenside is Span80 and Tween80; And/or described inorganic nano-particle stablizer is white carbon black and attapulgite gel; And/or described in to have the characteristic water-soluble high-molecular material that falls leak-off effect be cellulose graft starch.
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| CN115895607A (en) * | 2022-09-01 | 2023-04-04 | 扬州润达油田化学剂有限公司 | Preparation method of environment-friendly closed-loop recycling solid lubricant for oilfield drilling |
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