CN105349123A - Oil-in-water drilling fluid taking biodiesel as dispersion phase as well as preparation method and application thereof - Google Patents
Oil-in-water drilling fluid taking biodiesel as dispersion phase as well as preparation method and application thereof Download PDFInfo
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Abstract
The invention provides oil-in-water drilling fluid taking biodiesel as a dispersion phase as well as a preparation method and application thereof. The oil-in-water drilling fluid comprises 40-70 parts by volume of water and 30-60 parts by volume of biodiesel, wherein the total volume of water and biodiesel is 100%; the oil-in-water drilling fluid further comprises the following components: bentonite with the mass-to-volume ratio (g/mL) of 1%-6%, sodium carbonate with the mass-to-volume ratio of 0.05%-0.3%, sodium hydroxide with the mass-to-volume ratio of 0.02%-0.05%, a main emulsifier with the mass-to-volume ratio of 2%-5%, an auxiliary emulsifier with the mass-to-volume ratio of 0.2%-1%, a shale inhibitor with the mass-to-volume ratio of 0.5%-5% and a filtrate reducer with the mass-to-volume ratio of 0.5%-5%. The oil-in-water drilling fluid provided by the invention has the characteristics of being low in cost, non-toxic, non-fluorescent, low in density, adjustable, good in rheological property, low in filter loss, excellent in lubricating property and high in upper temperature resistance limit, and further has advantages of being excellent in antifouling property, shale inhibition property, reservoir protection property and environment acceptability.
Description
Technical field
The present invention relates to a kind of oil-in-water drilling fluid and preparation method thereof and application, particularly relating to a kind of take biofuel as oil-in-water drilling fluid of disperse phase and preparation method thereof and application, belongs to oil and gas well drilling liquid technical field.
Background technology
Along with developing rapidly of domestic and international oil and gas exploration business, the formation condition of drilling operation is day by day complicated.When creeping in the saturating hydrocarbon-bearing pool of low pressure and low permeability, because reservoir pressure is low or seam hole is grown, easily there is the problem such as drilling fluid leakage or reservoir damage.In addition when some newfound block probing wells, in order to find new hydrocarbon-bearing pool timely and accurately, more effectively developing hydrocarbon resources, is implement under-balance drilling operation, to protect reservoir to greatest extent mostly.
Oil-in-water drilling fluid is a kind of low density drilling fluid, has both maintained the advantage of water-base drilling fluid, possesses again the feature of oil base drilling fluid, is widely used in low-pressure stratum well, underbalance well, horizontal well, extended reach well drilling operation.
CN102140334A discloses the oil-in-water drilling fluid of a kind of applicable difference water with slurry and oil, this oil-in-water drilling fluid comprises seawater or fresh water, oil (white oil, makings oil or diesel oil), primary emulsion, auxiliary emulsifying agent, fluid loss agent, tackifier and high-density weighting material, and its density can be low to moderate 0.87g/cm
3, effectively can prevent the formation leakage problem of low pressure exhaustion hydrocarbon zone and can rate of penetration be improved, being conducive to liberating hydrocarbon zone, improving Oil & Gas Productivity.But the tackifier in this oil-in-water drilling fluid system have employed the poor xanthan gum of heat-resisting property, although do not provide the description about drilling fluid heat-resisting property in the document, but the general system temperature resistance upper limit containing xanthan gum is no more than 120 DEG C, at high temperature may lose suitable viscosity and shear force.
CN104140794A discloses a kind of high temperature-resisting oil-in-water drilling fluid.This oil-in-water drilling fluid is formulated by water, oil (diesel oil or white oil), sodium bentonite, sodium hydroxide, heat and salinity tolerance fluid loss agent, sodium carboxymethyl-cellulose, sulfonated phenol formaldehyde resin, sulfonated lignite, high-temperature stabiliser, high temperature resistance emulsifying agent, Repone K and pitch, its temperature resistance upper limit reaches 180 DEG C, and density is minimum reaches 0.88g/cm
3, effectively can prevent the formation leakage of low pressure exhaustion hydrocarbon zone, be conducive to improving Oil & Gas Productivity.
CN104194747A discloses the oil-in-water drilling fluid of a kind of heatproof 200 DEG C.This oil-in-water drilling fluid is made up of water, diesel oil, primary emulsion, auxiliary emulsifying agent, stablizer and shale control agent, and its density is minimum reaches 0.9g/cm
3, and under 200 DEG C of envrionment conditionss, its properties still can be kept good, ensure that carrying out smoothly of wellbore construction.But the water oil quality ratio of this oil-in-water drilling fluid system is fixed to 4:6, this means that its density is relatively fixing, the mode not by changing water-oil ratio adjusts density neatly, causes its application to have certain limitation.
It take vegetables oil as oil-in-water drilling fluid of interior phase and preparation method thereof that CN104610944A discloses a kind of.Wherein said oil-in-water drilling fluid comprises water, vegetables oil, primary emulsion, auxiliary emulsifying agent, tackifier, sodium hydroxide, carries gluing and cut agent and two kinds of fluid loss agents, this oil-in-water drilling fluid system stable performance, anti-drilling bits and clay pollution capacity strong, safety and environmental protection, direct discharge can be realized, its high temperature resistance upper limit can reach 170 DEG C, and density range is 0.89 ~ 0.99g/cm
3.
CN1362463A discloses a kind of high temperature-resisting oil-in-water drilling fluid, its object is to solve the poor and problem that density is high of drilling fluid high temperature resistant property in drilling process.This oil-in-water drilling fluid comprises water, diesel oil, wilkinite, high temperature resistance emulsifying agent, cationic stablizer and cellulose family water retaining, and its high temperature resistance upper limit can reach 160 DEG C, and density is minimum reaches 0.9g/cm
3, bottom hole pressure difference lower in drilling operation course can be ensured, thus to meet at pressure factor be the requirement implementing under-balance drilling operation in the stratum of about 1.0, and this oil-in-water drilling fluid fluid loss is lower.
Although above-mentioned prior art provides multiple oil-in-water drilling fluid, but in above-mentioned oil-in-water drilling fluid system, most employing diesel oil, mineral oil (white oil) or gas liquefaction etc. are as disperse phase, and this can bring problems, such as environmental issue, shop problem and Cost Problems etc.
The sulphur simple substance, sulfide and the aroma substance that contain in diesel oil are poisonous; The gentle liquefaction of diesel oil, white oil not readily biodegradables.These cause can not directly being discharged when reality uses by the oil-in-water drilling fluid of this several oil preparation, must reclaim or discharge after treatment, make drilling operation complicated to a certain extent, add operating cost.In addition, prior art has part oil-in-water drilling fluid to use the bitumen that toxicity is higher, such as CN104140794A, or employs the emulsifying agent containing phenyl ring, such as CN104610944A, and the discharge of these drilling fluids can destroy ecotope.In addition, the fluorescence of diesel oil also can affect the explanation of log data.
The oil-in-water drilling fluid provided in prior art, only partly can meet the requirement to environmental-protecting performance, but in drilling fluid, use vegetables oil to have following shortcoming when taking vegetables oil as disperse phase:
1. vegetables oil viscosity is high: this can affect the rheological of oil-in-water drilling fluid to a certain extent, makes its equivalent circulating density higher, and in drilling operation course, easily pressure leaks stratum, also bigger than normal to the load of the fluid conveying machines such as drilling fluid pump;
2. vegetables oil cost is higher: current three arrive the cost of level Four vegetables oil at about 6000 yuan;
3. other industry is affected: current, have in the vegetables oil that oil-in-water drilling fluid is used and prepared by edible crop or grain greatly, as Oleum Cocois, rapeseed oil and soybean wet goods, be used for by these edible oils to serve pressure to the supply tape of agricultural byproducts in industry, this is that national policy is not advocated.
Therefore, there is certain limitation with the oil-in-water drilling fluid system that vegetables oil is interior phase, be difficult to meet industrial requirement completely.
The main component of biofuel is the mono alkyl ester of lipid acid, and current people mainly use it as fuel.In recent years, the production of biodiesel state of the art of countries in the world improves constantly, and output increases fast, and China is also vigorously supporting biodiesel technology.
Many advantages such as biofuel has safety and environmental protection, viscosity is low, cost is low, abundance and be more applicable to industrial application, through retrieval, those skilled in the art had correlative study for how biofuel is applied to drilling fluid system:
CN102504772A discloses a kind of biodiesel drilling fluid, and described drilling fluid comprises biofuel, organophilic clay, organic brown coal and pitch, and this system is full oil base drilling fluid system; CN103305196A and CN103320104A individually discloses water-in-oil-type biofuel base drilling fluid.These schemes are all using biofuel as external phase, formation be invert mud system.
Through looking into, do not find the technology report of the oil-in-water drilling fluid taking biofuel as disperse phase.
Summary of the invention
It take biofuel as the oil-in-water drilling fluid of disperse phase that an object of the present invention is to provide a kind of.
Another object of the present invention is to the preparation method that described oil-in-water drilling fluid is provided.
Another object of the present invention is to the application that described oil-in-water drilling fluid is provided.
On the one hand, the invention provides a kind of take biofuel as the oil-in-water drilling fluid of disperse phase, and this oil-in-water drilling fluid comprises following component:
Water 40 ~ 70 parts by volume;
Biofuel 30 ~ 60 parts by volume;
In the cumulative volume of described water and biofuel for 100%, described oil-in-water drilling fluid also comprises:
Mass volume ratio is the wilkinite of 1% ~ 6%;
Mass volume ratio is the sodium carbonate of 0.05% ~ 0.3%;
Mass volume ratio is the sodium hydroxide of 0.02% ~ 0.05%;
Mass volume ratio is the primary emulsion of 2% ~ 5%;
Mass volume ratio is the auxiliary emulsifying agent of 0.2% ~ 1%;
Mass volume ratio is the shale control agent of 0.5% ~ 5%;
Mass volume ratio is the fluid loss agent of 0.5% ~ 5%;
Wherein, the unit of described mass volume ratio is g/mL; Described water is fresh water or seawater;
Described primary emulsion is polyoxyethylene sorbitan fatty acid ester and/or fatty alcohol-polyoxyethylene ether;
Described auxiliary emulsifying agent is sorbitan fatty(acid)ester.
According to specific embodiment of the invention scheme, of the present invention is in the oil-in-water drilling fluid of disperse phase with biofuel, described biofuel is take waste grease as the biofuel that raw material obtains, mainly comprise fatty acid methyl ester and/or fatty-acid ethyl ester, the indexs such as its acid number, Glycerols content, oxidation stability all meet China's GB/T20828-2007 requirement.Described biofuel specifically can be prepared by prior art or directly commercially available voluntarily.The fundamental property of the present invention's biofuel used and the contrast of diesel oil and low toxicity mineral oil can see tables 1.
The fundamental property index of table 1 the present invention biofuel used (Typical examples) and No. 5 white oils, No. 0 diesel oil
As can be seen from Table 1, some fundamental propertys of the present invention's biofuel used have significant difference compared with diesel oil or vegetables oil, and this kind of biofuel directly can not substitute diesel oil in existing oil-in-water drilling fluid system simply or vegetables oil is used for drilling operation.Carry out groping research to the oil-in-water drilling fluid system formulation taking biofuel as disperse phase in the present invention.
According to specific embodiment of the invention scheme, of the present invention is that in the oil-in-water drilling fluid of disperse phase, emulsification system used is with biofuel: the auxiliary emulsifying agent (sorbitan fatty(acid)ester) of the primary emulsion (polyoxyethylene sorbitan fatty acid ester and/or fatty alcohol-polyoxyethylene ether)+0.2% ~ 1% of 2% ~ 5%.More specifically, described polyoxyethylene sorbitan fatty acid ester is polyoxyethylene sorbitan mono-laurate (commercial goods code name is Tween-20); Described fatty alcohol-polyoxyethylene ether is laureth-4 (commercial goods code name is MOA-9) and/or α-isotridecyl-ω-hydroxyl-poly-(oxygen-1,2-ethylidene) (isomerous tridecanol polyoxyethylene ether, commercial goods code name is E-1302); Described sorbitan fatty(acid)ester is dehydrating sorbitol monooleate (commercial goods code name Span-80) or anhydrosorbitol trioleate (commercial goods code name is Span-85).
Table 2 lists the emulsifying effectiveness of some emulsifier to biofuel/water mixed liquid, and experiment test condition is: under high-speed stirring condition, slowly adds biofuel and the emulsifying agent of 40 parts by volume successively, high-speed stirring 30min in the fresh water of 60 parts by volume.With massfraction be 20% sodium hydroxide solution the pH value of mixed solution is adjusted to 10 after, with whizzer with the rotating speed of 4000r/min to the centrifugal 20min of mixed solution, observe centrifugal after phenomenon and delamination, if when mixed solution has aqueous phase to separate out after centrifugal, measure the per-cent that the aqueous phase of separating out accounts for mixed solution cumulative volume, and then pass judgment on emulsifying agent to the emulsifying effectiveness of biofuel/water mixed liquid.The addition (mass volume ratio g/ml) of emulsifying agent and test result as shown in table 2:
Table 2 different emulsifiers is to the emulsifying effectiveness of biofuel/water mixed liquid
Can find out by table 2, castor oil polyoxyethylene ether (EL-60), polyoxyethylene fatty acid ester (4%LAE-9), polyoxyethylene nonylphenol ether (OP-10), stearic acid polyoxyethylene ether (SG-20) and sodium oleate oil-in-water emulsifiers are to the emulsifying capacity of water/biofuel system emulsifier combination all not as described in the present invention.When using primary emulsion of the present invention (Tween-20 or MOA-9 or E-1302) and auxiliary emulsifying agent (Span-80 or Span-85) combination carries out emulsification to water/biofuel mixed solution, gained mixed solution is all not stratified after centrifugation, and emulsifying effectiveness is excellent.
According to specific embodiment of the invention scheme, of the present invention is in the oil-in-water drilling fluid of disperse phase with biofuel, bentonitic consumption for of the present invention be that the elemental operation performance impact of disperse phase oil-in-water drilling fluid is very large with biofuel, basic role performance requriements can be met when bentonitic mass volume ratio is 1% ~ 6%.
According to specific embodiment of the invention scheme, of the present invention be that in the oil-in-water drilling fluid of disperse phase, described shale control agent is Repone K and/or non-fluorescence collapse-proof agent NFA-25 with biofuel.The all commercially available acquisition of these two kinds of shale control agents, such as non-fluorescence collapse-proof agent NFA-25 can purchased from Jingzhou City Hyundai Petroleum Technology Development Co., Ltd, Hubei Province or Zhengzhou City Henan Province Fine Chemical Co., Ltd in the Double Ninth Festival.Non-fluorescence collapse-proof agent NFA-25 is commonly called as albino bitumen, and it carries out modification by paraffin or polyethylene wax by polyacrylamide, lipid acid and obtains, and not only enhances the water-soluble of wax but also maintain its softening temperature feature.
According to specific embodiment of the invention scheme, of the present invention be that in the oil-in-water drilling fluid of disperse phase, described fluid loss agent comprises one or more in low sticky sodium carboxymethyl-cellulose, sulfonated-methyl brown coal or sulfonated-pheno-formoldehyde resin with biofuel.Described low sticky Xylo-Mucine is for meeting API13A-2010 international standard (" SpecificationforDrillingFluidsMaterials ", be equal to ISO13500:2009 " Petroleumandnaturalgasindustries-DrillingFluids-Specificationsandtesting ") " the low sticky Xylo-Mucine of technical grade " product, commercially available acquisition, such as, purchased from Beijing Ao Kaili development in science and technology company limited.
Of the present invention is in the oil-in-water drilling fluid of disperse phase with biofuel; each component has good mutual synergy; make the characteristics such as oil-in-water drilling fluid of the present invention has low, the nontoxic unstressed configuration of cost, density is low and adjustable, rheological is good, filter loss is low, oilness is excellent, the temperature resistance upper limit is high; the basic demand of drilling operation can be met; in addition, oil-in-water drilling fluid of the present invention also has the advantages such as good antifouling property, shale inhibition energy, reservoir protection performance and environmental acceptability.Specifically, the present invention confirms that of the present invention is that the oil-in-water drilling fluid of disperse phase has following premium properties with biofuel by experiment:
(1) density is lower: density range is 0.89 ~ 0.98g/cm
3; And adjust flexibly by changing water-oil ratio;
(2) rheological is good: when it flows, its yield value is in the suitable scope of 5 ~ 15Pa, its ratio of dynamic shear force/yield value to plastic viscosity has value higher more than 0.15, its apparent viscosity is within the scope of 20 ~ 100mPas, modest viscosity and its viscosity can be adjusted flexibly, to meet actual requirement of engineering, above performance guarantee its can cutting carring smoothly; When it is static, its ingress and egress all within the scope of 2 ~ 15Pa, comparatively Weak Gels can be formed fast, so as when termination of pumping suspension solid phase;
(3) filter loss is low: the low-temp low-pressure filter loss≤10mL measuring system by national standard " industrial gas oil drilling fluid on-the-spot test part 1: water-base drilling fluid " (GB/T16783.1-2006) standard program, at 140 DEG C, under 3.5MPa, measure the high temperature and high pre ssure filtration≤15mL of system by national standard " industrial gas oil drilling fluid on-the-spot test part 1: water-base drilling fluid " (GB/T16783.1-2006) standard program;
(4) oilness is good: extreme boundary lubrication coefficient is lower than 0.1;
(5) the temperature resistance upper limit reaches 140 DEG C: at 140 DEG C, high temperature rolls after aging 16h, and the rheological of drilling fluid system, filter loss and oilness are still in aforementioned range;
(6) contamination resistance is strong: be subject to after the drilling well common contaminant such as sodium-chlor, calcium chloride, inferior soil invade dirt when drilling fluid, above-mentioned performance still can meet drilling operation requirement;
(7) shale inhibition is strong: its shale inhibition is better than ortho-water base drilling fluid;
(8) reservoir protection is good: the permeability resume figure before and after polluting reservoir rock is higher;
(9) drilling fluid unstressed configuration, does not affect test and well logging;
(10) environmentally friendly: the bio-toxicity of drilling fluid is within the scope of the water-base drilling fluid bio-toxicity permissible value that specifies in national standard; The biochemical oxygen demand of drilling fluid and the ratio BOD/COD>20% of chemical oxygen demand (COD), can directly discharge, this advantage is not only derived from that biofuel itself is nontoxic, the characteristic of readily biodegradable, is also that other components that the present invention selects also are that low toxicity is even nontoxic.
(11) cost is lower: close as the oil-in-water drilling fluid cost of interior phase with use diesel oil, all lower as the oil-in-water drilling fluid cost of interior phase than use mineral oil, gas liquefaction or vegetables oil.
In the present invention, except indicating especially, described ratio and content are mass ratio and mass content.
In the present invention, all commercially available acquisition of each component, its index of correlation meets corresponding Industry code requirements.
" mass volume ratio " in the present invention refers to except water and biofuel, the quality of other each components and the ratio of described water and biofuel cumulative volume, and wherein when the quality of other components is using " g " as unit, the unit of corresponding volume is " mL ".
According to specific embodiment of the invention scheme, of the present invention is that the oil-in-water drilling fluid of disperse phase also can comprise the tackifier that mass volume ratio is 0.05 ~ 1% further with biofuel.When the present invention finds to add tackifier in the oil-in-water drilling fluid system taking biofuel as disperse phase; described tackifier can coordinate with a small amount of cooperate with alta-mud; good rheological can be obtained; and the amount changing tackifier can regulate and control the viscosity number of drilling fluid easily; obtaining excellent, viscosity can the low solid phase oil-in-water drilling fluid of flexible modulation, and this low solid phase oil-in-water drilling fluid contributes to the protection of reservoir.Preferably, described tackifier are viscosity-average molecular weight is the anion-polyacrylamide of 10% ~ 30% in 1,200 ten thousand ~ 2,400 ten thousand and degree of hydrolysis.More preferably, described tackifier to be viscosity-average molecular weight be 1,200 ten thousand ~ 1,600 ten thousand and degree of hydrolysis be the anion-polyacrylamide of 20% ~ 30%.
On the other hand, be the preparation method of the oil-in-water drilling fluid of disperse phase with biofuel described in the invention provides, the method comprises the following steps:
(1) in described water, add described sodium carbonate, described wilkinite, described sodium hydroxide successively, stir and make component fully dissolve dispersion, maintenance obtains base slurry;
Such as, under the above condition of rotating speed 5000rpm, in described water, add described sodium carbonate, described wilkinite, described sodium hydroxide successively, stir more than 20min and make component fully dissolve dispersion, under room temperature, maintenance for some time (normally prehydration 24h) obtains base slurry;
(2) in gained base slurry, add described primary emulsion, described auxiliary emulsifying agent, described shale control agent and described fluid loss agent successively, each component is fully disperseed, optionally, in base slurry, add described tackifier;
Such as, under the above condition of rotating speed 5000rpm, stir more than 20min add each component in base slurry after, each component is fully disperseed;
(3) in gained mixture in step (2), add biofuel, after mixing, be namely able to the oil-in-water drilling fluid that biofuel is disperse phase.Such as under rotating speed is more than 5000rpm condition, stir more than 30min, system is mixed.
Again on the one hand, present invention also offers described take biofuel as the application of oil-in-water drilling fluid in drilling operation of disperse phase.Of the present invention is that the oil-in-water drilling fluid of disperse phase can be applicable to the drilling operations such as horizontal well, extended reach well or underbalance well with biofuel, or be applied to low porosity and low permeability reservoir, the low reservoir of reservoir pressure coefficient, seam hole grow in the drilling operation courses such as easy leakage reservoir.
In sum; the invention provides a kind of take biofuel as the oil-in-water drilling fluid of disperse phase; this drilling fluid has low, the nontoxic unstressed configuration of cost, density is low and adjustable, rheological is good, filter loss is low, oilness is excellent, the more high characteristic of the temperature resistance upper limit; the Essential Performance Requirements of drilling operation can be met; in addition, this oil-in-water drilling fluid also has the advantages such as good antifouling property, shale inhibition energy, reservoir protection performance and environmental acceptability.
Accompanying drawing explanation
Fig. 1 is embodiment 1 gained oil-in-water drilling fluid system shale expansion curve and fresh water shale expansion curve comparison figure;
Fig. 2 is embodiment 5 gained oil-in-water drilling fluid system shale expansion curve and fresh water shale expansion curve comparison figure.
Embodiment
In order to there be understanding clearly to technical characteristic of the present invention, object and beneficial effect, now in conjunction with specific embodiments following detailed description is carried out to technical scheme of the present invention, these examples should be understood and be only not used in for illustration of the present invention and limit the scope of the invention.
In following examples, when the fundamental property of gained oil-in-water drilling fluid need be tested, test with reference to national standard " industrial gas oil drilling fluid on-the-spot test part 1: water-base drilling fluid " (GB/T16783.1-2006), wherein, Fann140 liquidensitometer is adopted to measure density; PH meter is adopted to measure pH value; Adopt the fast rotary viscosity design determining rheological parameter of ZNN-D6 six; Adopt in three normal temperature and press filter press WTH140-40 to measure low-temp low-pressure filter loss; FannFilterPress500mL high-temperature and high-pressure filter press is adopted to measure high temperature and high pre ssure filtration (140 DEG C, 3.5MPa); Fann212 type extreme boundary lubrication instrument is adopted to measure the lubricating coefficient of drilling fluid.When rolling the properties of front and back drilling fluid to specific heat, the heat condition of rolling testing liquid is poured into stainless steel high temperature digestion tank, is placed in roller process furnace heat rolls 16h at 140 DEG C.
In following examples, shale control agent NFA-25 is purchased from purchased from Jingzhou City Hyundai Petroleum Technology Development Co., Ltd, Hubei Province.
Embodiment 1
The formula of the present embodiment oil-in-water drilling fluid:
Fresh water 50 parts by volume;
Biofuel volume 50 parts by volume;
And be 100% based on the cumulative volume of fresh water and biofuel: mass volume ratio (g/mL) is the sodium carbonate of 0.15%, mass volume ratio (g/mL) is the wilkinite of 3%, mass volume ratio (g/mL) is the sodium hydroxide of 0.03%, mass volume ratio (g/mL) is the primary emulsion Tween-20 of 4%, mass volume ratio (g/mL) is the auxiliary emulsifying agent Span-85 of 0.5%, mass volume ratio (g/mL) be 1% shale control agent NFA-25 and mass volume ratio (g/mL) be 0.6% low sticky Xylo-Mucine.
The preparation method of the oil-in-water drilling fluid of embodiment 1 is as follows:
Under high-speed stirring condition, in fresh water, slowly add sodium carbonate, wilkinite, sodium hydroxide successively, high-speed stirring 30min, sealing, at room temperature maintenance 24h, obtain base slurry.Get above-mentioned base slurry under high-speed stirring condition, slowly add primary emulsion Tween-20, auxiliary emulsifying agent Span-85, shale control agent NFA-25, low sticky Xylo-Mucine successively, all to stir 20min after often kind for the treatment of agent adds and add lower one again, until these components are fully disperseed in a liquid.Under high-speed stirring condition, slowly add biofuel, then stir more than 30min, make liquid fully mix, be i.e. the oil-in-water drilling fluid of obtained the present embodiment.
Performance test is carried out to embodiment 1 gained oil-in-water drilling fluid 1, to evaluate its elemental operation performance, antifouling property, biodegradability, shale inhibition energy and reservoir protection performance.
Elemental operation performance
Method as described above tests the elemental operation performance of the present embodiment gained oil-in-water drilling fluid, and result is as shown in table 3:
Table 3 embodiment 1 drilling fluid system fundamental property
As can be seen from Table 3, the oil-in-water drilling fluid density that embodiment 1 prepares is lower, and in weakly alkaline, meeting usual is the requirement of 8 ~ 11 to oil-in-water drilling fluid pH value; Apparent viscosity, plastic viscosity and yield value are moderate; Ratio of dynamic shear force/yield value to plastic viscosity is higher, ingress/and egress is suitable, high temperature and high pre ssure filtration is qualified, oilness is fine; And little in the roll change of aging front and back properties of high temperature, the requirement of underbalance well, horizontal well or extended reach well drilling operation can be met.
Antifouling property
Sodium-chlor, calcium chloride or inferior soil is added respectively in embodiment 1 gained oil-in-water drilling fluid, and the parameters of fundamental property is measured by aforementioned identical method, invade dirty ability to investigate the present embodiment gained oil-in-water drilling fluid opposing drilling well common contaminant, result is as shown in table 4:
Table 4 embodiment 1 drilling fluid system contamination resistance test result
As can be seen from Table 4, after adding 10% sodium-chlor, 20% calcium chloride or 10% inferior soil respectively in embodiment 1 gained oil-in-water drilling fluid, though the performance of drilling fluid changes, but still be in acceptable scope.Therefore, the present embodiment gained oil-in-water drilling fluid has certain anti-salt, anticalcium, anti-inferior soil to invade dirty ability.Particularly the anti-calcium chloride upper limit of this drilling fluid reaches 20%, in similar drilling fluid, belong to good.
Bio-toxicity
Carry out parameter in bio kinetic model according to standard GB/T/T18420-2009 " offshore oil exploration and exploitation pollutent bio-toxicity " to oil-in-water drilling fluid described in embodiment 1, biological subject is artemia larvae.Test result shows, oil-in-water drilling fluid described in embodiment 1 is to the 96h toxic limit medium dose LC of artemia larvae
50for 43693mg/L, lifeless matter toxicity, directly can discharge in one-level sea area and secondary sea area.
Biological degradability
Biochemical oxygen demand (BOD) is adopted to characterize the biological degradability of embodiment 1 gained oil-in-water drilling fluid with the ratio of chemical oxygen demand (COD) (COD).In this ratio reflection drilling fluid, biodegradable organism accounts for the ratio of total amount of organic, and this value is larger, shows that the biological degradability of drilling fluid is better.Take concentration as the seawater of the present embodiment gained oil-in-water drilling fluid of 2mg/L be sample, according to national environmental protection industry standard HJ/T399-2007 " the mensuration rapid-digestion spectrophotometry of water chemical oxygen demand ", COD measured; Take concentration as the seawater of the present embodiment gained oil-in-water drilling fluid of 2mg/L be sample, according to standard GB/T/T30665-2014 " the airtight bottle method of the biological degradability in chemical seawater ", BOD measured.Measurement result shows, in 28 days, the BOD/COD value of this sample reaches 71.6%, shows that the present embodiment gained oil-in-water drilling fluid belongs to the material of readily biodegradable.
Shale inhibition
1. shale expansion test:
By the shale bed rock core (sampling depth is about 1100m) of south of Sichuan Basin, China well, rock sample is pressed into after pulverizing, with this rock sample for chip sample, adopt NP-03 shale expansion instrument to measure the shale expansion curve of embodiment 1 gained oil-in-water drilling fluid system filtrate and clear water respectively, gained shale expansion curve as shown in Figure 1.As can be seen from Figure 1, shale contacts rate of expansion after 48h with clear water be 95.16%, and rate of expansion is only 6.59% after embodiment 1 gained oil-in-water drilling fluid contact 48h, illustrate that the shale expansion rate of enforcement 1 routine gained oil-in-water drilling fluid system is significantly lower than clear water, this shows that embodiment 1 gained oil-in-water drilling fluid prevents the ability of shale expansion to be far better than ortho-water base drilling fluid.
2. Shale Dispersion test:
Shale is broken into pieces rear mistake 6 ~ 10 mesh sieve, get gained landwaste 50g, load and fill in the mud digestion tank of 350g clear water or the present embodiment gained oil-in-water drilling fluid, high temperature rolling 16h at 140 DEG C.Take out digestion tank, be cooled to room temperature, the liquid in tank and rock sample be all poured on 40 order sub-sieves, in the tank filling tap water, sieve and wash 1min.Then the thermostatic drying chamber 40 mesh screen residue regenerants being put into (105 ± 3 DEG C) is dried, and is cooled to room temperature and weighs after taking-up, calculates shale recovery ratio.The Shale Dispersion test result of clear water and embodiment 1 gained oil-in-water drilling fluid is as shown in table 5.As can be seen from Table 5, the shale recovery ratio of embodiment 1 gained oil-in-water drilling fluid, much larger than clear water, shows that embodiment 1 gained oil-in-water drilling fluid prevents the very capable of Shale Dispersion.
Table 5 embodiment 1 drilling fluid system Shale Dispersion test result
| System | The landwaste rolling rate of recovery (%) |
| Clear water | 8.2 |
| Embodiment 1 oil-in-water drilling fluid | 88.48 |
Can find out that embodiment 1 gained oil-in-water drilling fluid has excellent shale inhibition from above shale expansion test, Shale Dispersion test.
Reservoir protection performance
Get 3 pieces of Shengli Oil Field Gu Dong oil recovery factories and 3 pieces of Dagang Oilfield Zhangdong area sandstone reservoir cores respectively; on core permeability tester; according to the reservoir protection performance of SY/T6540-2002 " damage of drilling fluid and completion fluid oil reservoir indoor evaluation method " Evaluation operation example 1 gained oil-in-water drilling fluid; evaluation result is as shown in table 6, K in table 6
afor the perm-plug method adopting nitrogen to measure, K
ofor adopting the rock core of kerosene mensuration by the permeability to oil before drilling fluid contamination, K
o' for rock core is by the permeability to oil (scraping off filter cake) after drilling fluid contamination.
Table 6 embodiment 1 drilling fluid system reservoir protection performance is evaluated
| Core numbers | K a(10 -3μm) | K o(10 -3μm) | K o'(10 -3μm) | K o'/K o(％) |
| 1 (triumph) | 334.83 | 64.89 | 58.91 | 90.79 |
| 2 (triumpies) | 326.19 | 63.90 | 54.17 | 84.78 |
| 3 (triumpies) | 302.41 | 59.84 | 53.02 | 88.61 |
| 4 (huge ports) | 15.88 | 8.82 | 7.21 | 81.78 |
| 5 (huge ports) | 16.26 | 8.64 | 7.18 | 83.08 |
| 6 (huge ports) | 15.41 | 8.20 | 6.57 | 80.15 |
As can be seen from Table 6, embodiment 1 gained oil-in-water drilling fluid pollutes before and after different compactness extent rock core, and permeability resume figure, all more than 80%, shows that embodiment 1 gained drilling fluid has good reservoir protection performance.
Embodiment 2
The formula of the present embodiment oil-in-water drilling fluid:
Fresh water 70 parts by volume;
Biofuel 30 parts by volume;
And be 100% based on the cumulative volume of fresh water and biofuel: mass volume ratio (g/mL) is the sodium carbonate of 0.2%, mass volume ratio (g/mL) is the wilkinite of 4%, mass volume ratio (g/mL) is the sodium hydroxide of 0.03%, mass volume ratio (g/mL) is the primary emulsion MOA-9 of 3%, mass volume ratio (g/mL) is the auxiliary emulsifying agent Span-80 of 0.5%, mass volume ratio (g/mL) is the shale control agent NFA-25 of 1.2%, mass volume ratio (g/mL) is the fluid loss agent (sulfonated-methyl brown coal of 2% and the sulfonated-pheno-formoldehyde resin of 2%) of 4%.
Comparative example 2 can find out with the formula of embodiment 1, and both key distinctions are: water-oil ratio is become 70:30 by embodiment 2; Use MOA-9 instead as primary emulsion, use Span-80 instead as auxiliary emulsifying agent, use the mixture of sulfonated-methyl brown coal and sulfonated-pheno-formoldehyde resin instead as fluid loss agent.Adopt embodiment 2 formula can make the lower oil-in-water drilling fluid of viscosity.
Method with reference to embodiment 1 obtains the oil-in-water drilling fluid of the present embodiment.
The elemental operation performance of method testing example 2 gained oil-in-water drilling fluid as described above, result is as shown in table 7:
Table 7 embodiment 2 drilling fluid system fundamental property
As can be seen from Table 7, embodiment 2 gained oil-in-water drilling fluid system still maintains qualified transaction capabilities when reducing viscosity, is conducive to reducing equivalent circulating density in drilling engineering, avoids pressure to leak stratum.
Embodiment 3
The formula of the present embodiment oil-in-water drilling fluid:
Fresh water 70 parts by volume;
Biofuel 30 parts by volume;
And be 100% based on the cumulative volume of fresh water and biofuel: mass volume ratio (g/mL) is the sodium carbonate of 0.05%, mass volume ratio (g/mL) is the wilkinite of 1%, mass volume ratio (g/mL) is the sodium hydroxide of 0.025%, mass volume ratio (g/mL) is the primary emulsion MOA-9 of 2.5%, mass volume ratio (g/mL) is the auxiliary emulsifying agent Span-80 of 0.4%, mass volume ratio (g/mL) is the shale control agent NFA-25 of 1.5%, mass volume ratio (g/mL) be 4% fluid loss agent (sulfonated-methyl brown coal of 2% and the sulfonated-pheno-formoldehyde resin of 2%) and mass volume ratio (g/mL) be 0.1% ~ 0.3% tackifier (molecular weight is 1,600 ten thousand, degree of hydrolysis is about the resistance to salt polyacrylamide of temperature resistance of 20%).
Comparative example 3 can find out with the formula of embodiment 2, and both key distinctions are: embodiment 3 reduces the dosage of wilkinite and sodium carbonate, and adds the tackifier of different amount.
Method with reference to embodiment 1 obtains the oil-in-water drilling fluid of the present embodiment.
The elemental operation performance of method testing example 3 gained oil-in-water drilling fluid as described above, result is as shown in table 8:
Table 8 embodiment 3 drilling fluid system fundamental property
As can be seen from Table 8, compared with embodiment 2, the bentonite content of embodiment 3 gained oil-in-water drilling fluid is only 1%, but by with the coordinating of tackifier, still can obtain good rheological, and change tackifier dosages can regulate and control easily drilling fluid viscosity number in case in drilling operation course successfully cutting carring.Therefore, embodiment 3 is a series of excellent propertys, viscosity can the low solid phase oil-in-water drilling fluid of flexible modulation.The inner solid phase particles content of this system is few, is conducive to reservoir protec-tion, avoids, when reservoir left by brill, solid phase latch up phenomenon occurs.In addition, along with adding of tackifier, the extreme boundary lubrication coefficient of embodiment 3 gained oil-in-water drilling fluid also reduces further, illustrates that tackifier can also improve the oilness of drilling fluid to a certain extent.
Embodiment 4
The formula of the present embodiment oil-in-water drilling fluid:
Fresh water 40 parts by volume;
Biofuel 60 parts by volume;
And be 100% based on the cumulative volume of fresh water and biofuel: mass volume ratio (g/mL) is the sodium carbonate of 0.15%, mass volume ratio (g/mL) is the wilkinite of 3%, mass volume ratio (g/mL) is the sodium hydroxide of 0.03%, mass volume ratio (g/mL) is the primary emulsion Tween-20 of 4%, mass volume ratio (g/mL) is the auxiliary emulsifying agent Span-80 of 1%, mass volume ratio (g/mL) be 0.8% shale control agent NFA-25 and mass volume ratio (g/mL) be 4% fluid loss agent (sulfonated-methyl brown coal of 2% and the sulfonated-pheno-formoldehyde resin of 2%).
Comparative example 4 can find out with the formula of embodiment 1, and both key distinctions are: water oil volume ratio is reduced to 40:60, use Span-80 instead as auxiliary emulsifying agent, use the mixture of sulfonated-methyl brown coal and sulfonated-pheno-formoldehyde resin instead as fluid loss agent.By the low density oil-in-water drilling fluid for low water-oil ratio that embodiment 4 formulated obtains.
Method with reference to embodiment 1 obtains the oil-in-water drilling fluid of the present embodiment.
The elemental operation performance of method testing example 4 gained oil-in-water drilling fluid as described above, result is as shown in table 9:
Table 9 embodiment 4 drilling fluid system fundamental property
As can be seen from Table 9, filled a prescription by embodiment 4 and can make that density is low reaches 0.89g/cm
3oil-in-water drilling fluid, and the elemental operation of system all can be qualified.
Embodiment 5
The formula of the present embodiment oil-in-water drilling fluid:
Fresh water 50 parts by volume;
Biofuel 50 parts by volume;
And be 100% based on the cumulative volume of fresh water and biofuel: mass volume ratio (g/mL) is the sodium carbonate of 0.125%, mass volume ratio (g/mL) is the wilkinite of 2.5%, mass volume ratio (g/mL) is the sodium hydroxide of 0.025%, mass volume ratio (g/mL) is the primary emulsion E-1302 of 3%, mass volume ratio (g/mL) is the auxiliary emulsifying agent Span-85 of 0.5%, mass volume ratio (g/mL) be 4.5% shale control agent Repone K and mass volume ratio (g/mL) be 4% fluid loss agent (sulfonated-methyl brown coal of 2% and the sulfonated-pheno-formoldehyde resin of 2%).
Comparative example 5 can find out with the formula of embodiment 1, both key distinctions are: the dosage reducing wilkinite and sodium carbonate, use E-1302 instead as primary emulsion, use Repone K instead as shale control agent, use the mixture of sulfonated-methyl brown coal and sulfonated-pheno-formoldehyde resin instead as fluid loss agent.
Method with reference to embodiment 1 obtains the oil-in-water drilling fluid of the present embodiment.
The elemental operation performance of method testing example 5 gained oil-in-water drilling fluid as described above, result is as shown in table 10:
Table 10 embodiment 5 drilling fluid system fundamental property
As can be seen from Table 10, the elemental operation performance of the oil-in-water drilling fluid of embodiment 5 gained is qualified.
The method testing example 5 gained oil-in-water drilling fluid identical by embodiment 1 and the shale expansion rate of water, its result as shown in Figure 2, as can be seen from Figure 2, shale contacts rate of expansion after 48h with clear water be 95.16%, and rate of expansion is only 7.58% after contacting 48h with embodiment 5 gained oil-in-water drilling fluid, illustrate that using Repone K to make shale control agent also can play more significant shale inhibition, this drilling fluid filtrate suppresses the ability of shale expansion to be far better than clear water.
The method identical by embodiment 1 carries out Shale Dispersion test to embodiment 5 gained oil-in-water drilling fluid and water, and its result is as shown in table 11.As can be seen from Table 11, the shale recovery ratio of embodiment 5 gained oil-in-water drilling fluid, much larger than clear water, illustrates the dispersion using Repone K also can avoid shale.
Table 11 embodiment 5 drilling fluid system Shale Dispersion is tested
| System | The landwaste rolling rate of recovery (%) |
| Clear water | 8.2 |
| Embodiment 5 oil-in-water drilling fluid | 75.73 |
Can find out that gained oil-in-water drilling fluid of the present invention has excellent shale inhibition further from above shale expansion test, Shale Dispersion test.
Embodiment 6
The formula of the present embodiment oil-in-water drilling fluid:
Seawater 60 parts by volume;
Biofuel 40 parts by volume;
And be 100% based on the cumulative volume of seawater and biofuel: mass volume ratio (g/mL) is the sodium carbonate of 0.2%, mass volume ratio (g/mL) is the wilkinite of 4%, mass volume ratio (g/mL) is the sodium hydroxide of 0.02%, mass volume ratio (g/mL) is the primary emulsion Tween-20 of 5%, mass volume ratio (g/mL) is the auxiliary emulsifying agent Span-85 of 1%, mass volume ratio (g/mL) be 0.8% shale control agent NFA-25 and mass volume ratio (g/mL) be 4.5% fluid loss agent (0.5% low sticky Xylo-Mucine, the sulfonated-methyl brown coal of 2% and the sulfonated-pheno-formoldehyde resin of 2%).
Comparative example 6 can find out with the formula of embodiment 1, both key distinctions are: embodiment 6 uses seawater instead as aqueous phase, increase water-oil ratio, improve the dosage of wilkinite and sodium carbonate, increase emulsifier, use the mixture of low sticky Xylo-Mucine, sulfonated-methyl brown coal and sulfonated-pheno-formoldehyde resin instead as fluid loss agent.
Method with reference to embodiment 1 obtains the oil-in-water drilling fluid of the present embodiment.
The elemental operation performance of method testing example 6 gained oil-in-water drilling fluid as described above, result is as shown in table 12:
Table 12 embodiment 6 drilling fluid system fundamental property
As can be seen from Table 12, the elemental operation performance of the oil-in-water drilling fluid of embodiment 6 gained is qualified.
The bentonitic dosage of comparative example 1 is tested the impact of fundamental property
This comparative example passes through the bentonitic content of performance specification of the different formula of contrast 4 wilkinite dosages to the impact of fundamental property.
Formula 1.
Fresh water volume: biofuel volume=40:60 ,+0.05% auxiliary emulsifying agent of sodium carbonate+1% wilkinite+0.03% sodium hydroxide+4% primary emulsion (Tween-20)+1% (Span-80)+1% shale control agent (NFA-25)+5% fluid loss agent (comprising 2.5% sulfonated-methyl brown coal and 2.5% sulfonated-pheno-formoldehyde resin).
Formula 2.
Fresh water volume: biofuel volume=40:60 ,+0.025% auxiliary emulsifying agent of sodium carbonate+0.5% wilkinite+0.03% sodium hydroxide+4% primary emulsion (Tween-20)+1% (Span-80)+1% shale control agent (NFA-25)+5% fluid loss agent (comprising 2.5% sulfonated-methyl brown coal and 2.5% sulfonated-pheno-formoldehyde resin).
Formula 3.
Fresh water volume: biofuel volume=70:30 ,+0.3% auxiliary emulsifying agent of sodium carbonate+6% wilkinite+0.05% sodium hydroxide+4% primary emulsion (Tween-20)+0.5% (Span-85)+2% shale control agent (NFA-25)+4% fluid loss agent (comprising 2% sulfonated-methyl brown coal and 2% sulfonated-pheno-formoldehyde resin).
Formula 4.
Fresh water volume: biofuel volume=70:30 ,+0.35% auxiliary emulsifying agent of sodium carbonate+7% wilkinite+0.05% sodium hydroxide+4% primary emulsion (Tween-20)+0.5% (Span-85)+2% shale control agent (NFA-25)+4% fluid loss agent (comprising 2% sulfonated-methyl brown coal and 2% sulfonated-pheno-formoldehyde resin).
Adopt formula 1. ~ 4., obtain corresponding oil-in-water drilling fluid with reference to the method for embodiment 1, and by the fundamental property of method mentioned above test gained oil-in-water drilling fluid, result is as shown in table 13:
Table 13 comparative example 1 drilling fluid system fundamental property
As shown in Table 13, when wilkinite dosage lower than 1% time (formula 2.), the ingressing of oil-in-water drilling fluid system/egress is too low, and high temperature and high pre ssure filtration is too high; When wilkinite dosage is more than 6% (formula 4.), the density of oil-in-water drilling fluid system is higher, is difficult to the demand meeting under-balance drilling operation, and ingressing before heat is rolled is too high.Therefore formula 2. with formula performance inconsistency lattice 4..Therefore in the present invention, wilkinite dosage controls in 1% ~ 6% scope.Wilkinite dosage is that the embodiment performance of 1% is see filling a prescription 1.; Wilkinite dosage be 6% embodiment performance see formula 3., these two formula fundamental propertys all qualified.
Comparative example 2
This comparative example, by the performance of contrast 3 formula, further illustrates the synergistic effect between wilkinite, tackifier, shale suppression, and when in oil-in-water drilling fluid of the present invention, bentonite content is lower, the advantage in reservoir protection.
Fill a prescription 1.:
Fresh water volume: biofuel volume=50:50 ,+0.2% auxiliary emulsifying agent of sodium carbonate+4% wilkinite+0.03% sodium hydroxide+4.5% primary emulsion (Tween-20)+0.5% (Span-85)+1% shale control agent (NFA-25)+4% fluid loss agent (comprising 2% sulfonated-methyl brown coal and 2% sulfonated-pheno-formoldehyde resin).
Fill a prescription 2.:
Fresh water volume: biofuel volume=60:40, + 0.05% auxiliary emulsifying agent of sodium carbonate+1.0% wilkinite+0.02% sodium hydroxide+4% primary emulsion (Tween-20)+0.5% (Span-85)+1.2% shale control agent (NFA-25)+4% fluid loss agent (comprising 1% low sticky Xylo-Mucine, 1.5% sulfonated-methyl brown coal and 1.5% sulfonated-pheno-formoldehyde resin)+0.1% tackifier (molecular weight is 1,600 ten thousand, and degree of hydrolysis is about the resistance to salt polyacrylamide of temperature resistance of 20%).
Fill a prescription 3.:
Fresh water volume: biofuel volume=70:30, + 0.05% auxiliary emulsifying agent of sodium carbonate+1.0% wilkinite+0.025% sodium hydroxide+3.5% primary emulsion (E-1302)+0.5% (Span-85)+4.5% shale control agent (Repone K)+5% fluid loss agent (comprising 1% low sticky Xylo-Mucine, 2.5% sulfonated-methyl brown coal and 2.5% sulfonated-pheno-formoldehyde resin)+0.16% tackifier (molecular weight is 1,600 ten thousand, and degree of hydrolysis is about the resistance to salt polyacrylamide of temperature resistance of 20%).
Adopt formula 1. ~ 3., obtain corresponding oil-in-water drilling fluid with reference to the method for embodiment 1, and by the fundamental property of method mentioned above test gained oil-in-water drilling fluid, result is as shown in table 14:
Table 14 comparative example 2 drilling fluid system fundamental property
Fill a prescription in contrast table 14 and 1. can find out with 2. gained property of drilling fluid of filling a prescription, formula is middle wilkinite dosage less (being only 1%) 2., but can make it under biofuel dosage is only the prerequisite of 40% (volume ratio), have the drilling fluid (fill a prescription 1., 4%) higher with wilkinite dosage similar apparent viscosity, plastic viscosity and yield value by the mode of adding tackifier.Similarly, 3. comparative formula can be found out with 1. gained property of drilling fluid of filling a prescription, by mode primary emulsion being changed into E-1302, shale control agent changed into Repone K, add tackifier, under biofuel dosage is only 30% (volume ratio) and wilkinite dosage is only the prerequisite of 1%, apparent viscosity, plastic viscosity and the yield value 1. close with formula can be obtained.Therefore tackifier can replace the thickening of clay to propose the effect of cutting to a certain extent.When in drilling fluid system containing tackifier time, can suitably reduce bentonitic dosage, and the lower oil-in-water drilling fluid of wilkinite dosage has the advantage little to formation damage.
Get Upper Paleozoic in Ordos Basin Sandstone Gas Reservoir rock core; on core permeability tester; described in carry out this comparative example according to SY/T6540-2002 " damage of drilling fluid and completion fluid oil reservoir indoor evaluation method ", the reservoir protection performance evaluation of 3 formula gained oil-in-water drilling fluids, measures permeability resume figure.Evaluation result is in table 15.
Drilling fluid system reservoir protection performance described in table 15 comparative example 2 is evaluated
| Drilling fluid system | Core numbers | K a(10 -3μm) | K o(10 -3μm) | K o'(10 -3μm) | K o'/K o(％) |
| ① | 1 | 5.07 | 1.83 | 1.28 | 70.05 |
| ② | 2 | 5.86 | 1.90 | 1.46 | 79.32 |
| ③ | 3 | 5.41 | 1.84 | 1.35 | 76.10 |
As shown in Table 15, because the formula described in comparative example 2 is 2. lower with formula bentonite content 3., have than formula 1. better reservoir protection performance, namely higher permeability resume figure.
Finally illustrate: above embodiment is only for illustration of implementation process of the present invention and feature; and unrestricted technical scheme of the present invention; although with reference to above-described embodiment to invention has been detailed description; those of ordinary skill in the art is to be understood that: still can modify to the present invention or equivalent replacement; and do not depart from any modification or partial replacement of the spirit and scope of the present invention, all should be encompassed in the middle of protection scope of the present invention.
Claims (10)
1. be an oil-in-water drilling fluid for disperse phase with biofuel, this oil-in-water drilling fluid comprises following component:
Water 40 ~ 70 parts by volume;
Biofuel 30 ~ 60 parts by volume;
With the entire volume of described water and biofuel, described oil-in-water drilling fluid also comprises:
Mass volume ratio is the wilkinite of 1% ~ 6%;
Mass volume ratio is the sodium carbonate of 0.05% ~ 0.3%;
Mass volume ratio is the sodium hydroxide of 0.02% ~ 0.05%;
Mass volume ratio is the primary emulsion of 2% ~ 5%;
Mass volume ratio is the auxiliary emulsifying agent of 0.2% ~ 1%;
Mass volume ratio is the shale control agent of 0.5% ~ 5%;
Mass volume ratio is the fluid loss agent of 0.5% ~ 5%;
Wherein, the unit of described mass volume ratio is g/mL; Described water is fresh water or seawater;
Described primary emulsion is polyoxyethylene sorbitan fatty acid ester and/or fatty alcohol-polyoxyethylene ether;
Described auxiliary emulsifying agent is sorbitan fatty(acid)ester.
2. according to claim 1 take biofuel as the oil-in-water drilling fluid of disperse phase, and wherein, the oil-in-water drilling fluid of described with biofuel is disperse phase also comprises the tackifier that mass volume ratio is 0.05% ~ 1%.
3. according to claim 2 take biofuel as the oil-in-water drilling fluid of disperse phase, and wherein, described tackifier are viscosity-average molecular weight is the anion-polyacrylamide of 10% ~ 30% in 1,200 ten thousand ~ 2,400 ten thousand and degree of hydrolysis; Preferably, described tackifier to be viscosity-average molecular weight be 1,200 ten thousand ~ 1,600 ten thousand and degree of hydrolysis be the anion-polyacrylamide of 20 ~ 30%.
4. according to claim 1 take biofuel as the oil-in-water drilling fluid of disperse phase, and wherein, described biofuel comprises fatty acid methyl ester and/or fatty-acid ethyl ester.
5. take biofuel as the oil-in-water drilling fluid of disperse phase according to any one of Claims 1 to 4, wherein:
Described polyoxyethylene sorbitan fatty acid ester is polyoxyethylene sorbitan mono-laurate;
Described fatty alcohol-polyoxyethylene ether is laureth-4 or α-isotridecyl-ω-hydroxyl-poly-(oxygen-ethylene).
6. take biofuel as the oil-in-water drilling fluid of disperse phase according to any one of Claims 1 to 4, and wherein, described sorbitan fatty(acid)ester is dehydrating sorbitol monooleate or anhydrosorbitol trioleate.
7. take biofuel as the oil-in-water drilling fluid of disperse phase according to any one of Claims 1 to 4, and wherein, described shale control agent is Repone K and/or non-fluorescence collapse-proof agent NFA-25.
8. take biofuel as the oil-in-water drilling fluid of disperse phase according to any one of Claims 1 to 4, and wherein, described fluid loss agent comprises one or more in low sticky sodium carboxymethyl-cellulose, sulfonated-methyl brown coal or sulfonated-pheno-formoldehyde resin.
9. according to any one of claim 1 ~ 8 take biofuel as the preparation method of the oil-in-water drilling fluid of disperse phase, and the method comprises the following steps:
(1) in described water, add described sodium carbonate, described wilkinite, described sodium hydroxide successively, stir and make component fully dissolve dispersion, maintenance obtains base slurry;
(2) in gained base slurry, add described primary emulsion, described auxiliary emulsifying agent, described shale control agent and described fluid loss agent successively, each component is fully disperseed, optionally, in base slurry, add described tackifier;
(3) in gained mixture in step (2), add biofuel, after mixing, be namely able to the oil-in-water drilling fluid that biofuel is disperse phase.
10. according to any one of claim 1 ~ 8 take biofuel as the application of oil-in-water drilling fluid in drilling operation of disperse phase.
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| CN114410283A (en) * | 2020-10-28 | 2022-04-29 | 杨雯淇 | Temperature-resistant and salt-resistant lubricant for environment-friendly drilling fluid and preparation method thereof |
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