CN108467714A - A kind of high-temperature high-density water-base drilling fluid performance regulation and control method - Google Patents

A kind of high-temperature high-density water-base drilling fluid performance regulation and control method Download PDF

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CN108467714A
CN108467714A CN201710100708.8A CN201710100708A CN108467714A CN 108467714 A CN108467714 A CN 108467714A CN 201710100708 A CN201710100708 A CN 201710100708A CN 108467714 A CN108467714 A CN 108467714A
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drilling fluid
particle size
weight
density
size range
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CN108467714B (en
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曾义金
林永学
杨小华
何伟国
王琳
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China Petroleum and Chemical Corp
Sinopec Research Institute of Petroleum Engineering
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Sinopec Research Institute of Petroleum Engineering
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    • C09K8/02—Well-drilling compositions
    • C09K8/03—Specific additives for general use in well-drilling compositions
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    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
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    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/02—Well-drilling compositions
    • C09K8/04—Aqueous well-drilling compositions
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    • C09K8/16—Clay-containing compositions characterised by the inorganic compounds other than clay
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    • C09K8/04—Aqueous well-drilling compositions
    • C09K8/14—Clay-containing compositions
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Abstract

The present invention provides a kind of high-temperature high-density water-base drilling fluid performances to regulate and control method, belongs to oil and gas prospect and development field.The present invention is by reducing liquid phase viscosity, reducing frictional resistance, reduce specific surface area and reduce solvation film thickness so that there is high-density water-based drilling fluid high temperature resistance, antipollution, height to take rock, strong lubricating ability and good rheological.Realize that high density drilling fluid rheological characteristic under high temperature is easily controllable, high temperature and high pressure filter loss is small, suspension stability is good using the method for the present invention, application effect is good.

Description

A kind of high-temperature high-density water-base drilling fluid performance regulation and control method
Technical field
The invention belongs to oil and gas prospects and development field, and in particular to a kind of high-temperature high-density water-base drilling fluid Performance regulates and controls method.
Background technology
In deep-well, ultradeep well or high temperature and pressure stratum drilling process, bottom hole temperature (BHT) is in 150 DEG C or more or higher, shaft bottom For pressure coefficient often up to 2.0 or more, underground hot environment seriously affects the properties of drilling fluid, high especially in saliferous strata There is chemical agent failure under long term high temperature in density drilling fluid, and drilling fluid thickening or dilution seriously lead to drilling fluid viscosity and high temperature Phenomena such as high filter pressing loss is difficult to control, and the weighting materials such as barite and landwaste sedimentation, landwaste are crushed repeatedly, easily build the pressure, Bit freezing causes test difficult, to further influence construction quality and construction cost, well is resulted even in when serious and is scrapped.
To fundamentally solve high density drilling fluid rheological characteristic at high temperature and suspension stability (also known as settlement stability Property) conflicting problem, the influence factor of clear drilling fluid rheology and suspension stability must be just probed into, it is highly dense to specify high temperature It spends property of drilling fluid and regulates and controls method, could correctly select and carry out Effective Regulation.Around the model and equation of drilling fluid rheology Many work have been carried out in research, e.g., the reports such as Pu Xiaolin to go out suspension system according to Einstein the and Hiemenz derivations of equation viscous Expression formula is spent, illustrates the rheological characteristic and solid phase percentage composition, particle dispersion degree, free water content and particle phase interaction of drilling fluid With the relationship of the factors such as power；The number of the apparent viscosity of the prediction water-in-oil emulsion mud of the foundation such as Yan Jienian at high temperature under high pressure Model is learned, can intuitively reflect influence degree of the temperature and pressure to apparent viscosity；Wang Lan etc. establishes prediction underground high temperature item The mathematical model of drilling fluid apparent viscosity under part, reflects influence of the temperature to apparent viscosity.Foreign scholar SLAWOMIRSKI etc. Report the mechanical characteristic of drilling fluid and the relationship of rheological equation of state, at the same report drilling fluid rotational flow it is theoretical and its with Well drilling pipe column speed is applied with moment loading relationship research；Abdullah Shafikah etc. report particle size and viscosity pair The influence etc. of drilling fluid settling property and rheological property.
All of above research is only strong and weak from interacting between solid phase percentage composition, solid phase particles dispersion degree, solid phase ion It angularly carries out, but that at present there are still viscosity is not easily-controllable for high density drilling fluid under hot conditions, high temperature and high pressure filter loss is big, stream The problems such as denaturation cannot take into account with suspension stability.
Invention content
It is an object of the invention to solve above-mentioned problem existing in the prior art, it is to aggravate material to provide one kind with barite The high-temperature high-density water-base drilling fluid performance of material regulates and controls method, and it is high to be suitable for deep-well, ultradeep well or high temperature and pressure ultra-deep horizontal well Density water base drilling fluid system.
The present invention is achieved by the following technical solutions：
A kind of high-temperature high-density water-base drilling fluid performance regulation and control method, passing through reduces liquid phase viscosity, reduces frictional resistance, reduces ratio Surface area and reduction solvation film thickness so that there is high-density water-based drilling fluid high temperature resistance, antipollution, height to take rock, strong lubrication Ability and good rheological property.
It is described to reduce what liquid phase viscosity was realized in：
Temperature resistance ability is added by force in high-density water-based drilling fluid and influences small fluid loss additive and stream on drilling fluid viscosity Type conditioning agent；
The fluid loss additive meets：The apparent viscosity of the aqueous solution of 5% dosage of fluid loss additive is within 15mPas；Polymerization The apparent viscosity of 1% aqueous solution of species fluid loss additive is within 5mPas.
It is described to reduce what frictional resistance was realized in：
It is added in high-density water-based drilling fluid high density drilling fluid lubricity is good, bubble-tight lubricant comes Reduce frictional resistance；
The lubricant includes following components：Macromolecular sulfurised ester, silane coupling agent, emulsifier and base oil；Each ingredient Proportion is respectively：Macromolecular sulfurised ester be 5~80 parts by weight, silane coupling agent be 1~15 parts by weight, emulsifier be 1~ 15 parts by weight, base oil are 10~90 parts by weight.
The reduction specific surface area is realized by the suitable particle size and content of preferred barite, specific as follows：
According to the heavy weight additive of the preferred suitable particle size of Alfred size distribution equations：
Y is the content less than particle D in above formula, and unit is %；DLFor maximum particle size；DSFor minimum particle size；N is modulus, when Deposition rate highest when n=0.37；
In conjunction with Stokes sedimentation theories, and the requirement constructed according to actual well drilled, the maximum particle diameter of heavy weight additive are no more than 100 μm, the suitable particle size grading with closelypacked solid phase is calculated as maximum particle size；
It is sieved to blanc fixe with classifying screen, collects the blanc fixe by different pore size, as being sieved by 100 μm Hole and cannot be 100-75 μm of particle size range by 75 μm of sieve pores, can cannot pass through 53 μm of sieve pores by 75 μm of sieve pores For 75-53 μm of particle size range, and so on obtain 53-37 μm of particle size range, 37-25 μm of particle size range, 25-20 μm of grain Diameter range, most thin, which is, to be 20 μm of ＜ by 20 μm of sieve pores；Then it weighs to the blanc fixe of each particle size range, Obtain the blanc fixe weight ratio of each particle size range；
, as a result, in conjunction with the use of actual powder body material, difference is weighed according to according to Alfred size distribution equation calculations It is used as heavy weight additive after the blanc fixe mixing of particle size range, wherein 100-75 μm of particle size range accounts for 25% weight ratio, 75-53 μ M particle size ranges account for 22% weight ratio, and 53-37 μm of particle size range accounts for 16% weight ratio, and 37-25 μm of particle size range accounts for 12% Weight ratio, 25-20 μm of particle size range account for 2% weight ratio, and grain size accounts for 23% weight ratio less than 20 μm.
It is described to reduce what solvation film thickness was realized in：
Dispersant is added in high-density water-based drilling fluid to reduce solvation film thickness, the dispersant is used with the following group Lease making pyroreaction is prepared：Lignin, phenols, sulfonating agent, aldehyde compound, catalyst and water；Each ingredient proportion Respectively：Lignin is 10~40 parts by weight, phenols is 1.5~20 parts by weight, sulfonating agent is 2.5~15 parts by weight, aldehydes Conjunction object is 0.5~5 parts by weight, catalyst is 0.5~4 parts by weight, water is 100 parts by weight.
The method be water-based drilling liquid-based slurry in sequentially add the dispersant, fluid loss additive, flow pattern regulator and Lubricant, stirring add the ratio barite after being uniformly dispersed to dissolving.
Compared with prior art, effect of the invention is：A kind of high temperature aggravated with barite provided by the invention is highly dense Property of drilling fluid regulation and control method is spent, is had for high-temperature high-density drilling fluid system structure, crucial inorganic agent research and development and formation relatively low The high-temperature high-density property of drilling fluid regulation and control thinking and control method of filter loss, good rheological characteristic and suspension stability provide Solid theoretical foundation and Research Thinking.Using the method for the present invention realize high density drilling fluid under high temperature do not thicken, rheological characteristic It is easily controllable, high temperature and high pressure filter loss is small, suspension stability is good, application effect is good.
Description of the drawings
Weighting material sedimentation high density drilling fluid easily occurs when Fig. 1 high density drilling fluid viscosity small flows are good to suspend surely Schematic diagram when qualitative difference
The schematic diagram that the excessively high poor fluidity of Fig. 2 high density drilling fluid viscosity, that is, high density drilling fluid rheological characteristic is deteriorated
Fig. 3 calculates the schematic diagram of the suitable particle size grading with closelypacked solid phase
The step block diagram of Fig. 4 the method for the present invention.
Specific implementation mode
Present invention is further described in detail below in conjunction with the accompanying drawings：
The present invention is based on Einstein theories, Hiemenz theories and Stokes sedimentation theories, frictional resistances low to high-temperature high-density Water base drilling fluid system viscosity influence factor is studied, it is proposed that a kind of high-temperature high-density water base drilling fluid system " is lifted up Seesaw " effect, high-temperature high-density water-base drilling fluid viscosity influence factor relation, control high-temperature high-density water-base drilling fluid are well filtered Vector, rheological characteristic, " three low one is thin " (low viscosity effect, low specific surface area, low frictional resistance, the thin solvation film) of suspension stability are more Factor coordinated regulation method, the crucial inorganic agent such as low viscosity polymer fluid loss additive and dispersant for being researched and developed according to the method and High-temperature high-density water base drilling fluid system, to ensure that high-density water-based drilling fluid system has good rheological characteristic, filter loss control Ability, stronger high-temperature resistance, contamination resistance, high large rock-carrying ability and strong lubricating ability processed solve deep-well, ultradeep well, surpass The problem being difficult to control between high density drilling fluid rheological characteristic, suspension stability and filtration property when deep water horizontal well is crept into.
For high-density water-based drilling fluid, rheological characteristic, suspension stability and filtration property are difficult to control the present invention at high temperature Etc. problems, provide a kind of high-temperature high-density water-base drilling fluid performance regulation and control method：
1) " seesaw " effect of high-density water-based drilling fluid existing rheological characteristic and suspension stability at high temperature is proposed； " seesaw " effect between the rheological characteristic and suspension stability is to improve drilling fluid density institute with high density solid phase heavy weight additive It is caused as a result, moreover, " seesaw " effect this in the high temperature environment is more notable.
At drilling deep wells, ultradeep well, the high pressure of ultra-deep horizontal well, super-pressure stratum, need by adding high density weight The weighting materials such as spar, Iron Ore Powder improve drilling fluid density, to reach equilibrium strata pressure, carry the purpose of shaft bottom drilling cuttings.But When the density requirements of drilling fluid are higher than 2.7g/cm3When above, the exacerbation agent content in drilling fluid need to reach 50% or more, simultaneously It needs to ensure that weighting material does not settle by additive for drilling fluid such as addition fluid loss additive, dispersants, in drilling fluid Serious leak-off does not occur for Free water.But the fluid loss additive and the Deal With Drilling Fluids dosage hour such as dispersant being added do not have suspension and Filtrate reducing acts on, and dosage often will appear greatly that drilling fluid viscosity is excessively high, and flow difficulties lead to the extremely difficult control of drilling fluid rheology.Example It, will in the case of such as ensureing that high density drilling fluid has good high temperature and high pressure filter loss in high temperature deep well underground work Appearance ensure that high density drilling fluid rheological characteristic is good, i.e., high density drilling fluid viscosity is small, good fluidity when will occur to aggravate material Material sedimentation is that drilling fluid suspension stability is poor (as shown in Figure 1), will when ensure that high density drilling fluid suspension stability is good There is the excessively high poor fluidity of drilling fluid viscosity, that is, high density drilling fluid rheological characteristic to be deteriorated (as shown in Figure 2), therefore, high density drilling well In the case where ensureing to have good high temperature and high pressure filter loss, that there are drilling fluid rheologies is total with suspension stability under liquid high temperature The phenomenon for occurring pooring on one side good while, i.e. " seesaw " effect of rheological characteristic and suspension stability existing for high density drilling fluid It answers.
2) Einstein suspension viscosities formula, Hiemenz solvate theories and Stokes sedimentation theories are based on, it is proposed that High-temperature high-density drilling fluid rheology difference factor influences relationship.
High density drilling fluid is a kind of thick suspension, when assuming that the solid phase particles of weighting material are spheroidal particle, knot Hiemenz solvate theories are closed, Einstein viscosity formula are represented by：
Wherein ηcFor thick dispersion viscosity；η0For the viscosity of decentralized medium；K is constant；For the volume shared by dispersed phase Score；S is solid phase specific surface area；H is granulation solvent film thickness.
As it can be seen that including the viscosity of decentralized medium to the contributive factor of high density drilling fluid viscosity, shared by the solid phase of dispersion Volume fraction, solid phase specific surface area and solid phase particles solvation film thickness.
Stokes sedimentation formula express solid phase particles system sinking speed influence factor：
utThe free-falling velocity of-particle, ms- 1；The diameter (m) of d-particle；ρsThe density of-particle, kgm- 3； The density of ρ-liquid phase, kgm- 3；ζ-resistance coefficient.The viscosity of wherein resistance coefficient and medium is closely related, the bigger resistance of viscosity Force coefficient is smaller.
Include the density of heavy weight additive, the density of liquid phase, disperse in the factor of system sinking speed as it can be seen that influencing solid phase particles The grain size and resistance coefficient of solid phase, the viscosity of wherein resistance coefficient and medium is closely related, and the bigger resistance coefficient of viscosity is smaller.
According to above-mentioned two formula, the principal element for influencing high density drilling fluid rheological characteristic and the quality of suspension stability has Dielectric viscosity, solvation film thickness, grain diameter, grain density etc., and these four factors are to rheological characteristic and suspension stability Influence relationship such as table 1：
Major influence factors Rheological characteristic is good Suspension stability is good
Dielectric viscosity It is low It is high
Solvation film thickness It is thin It is thick
Grain diameter Greatly It is small
Grain density Greatly It is small
Table 1
1. dielectric viscosity reduces, the rheological characteristic of drilling fluid is good, and suspension stability is deteriorated；When dielectric viscosity increases, drilling fluid Rheological characteristic be deteriorated, viscosity is high, but is conducive to suspension stability；
2. the rheological characteristic of solvation thin film thickness, drilling fluid is good, suspension stability is deteriorated；Solvation film thickness is thick, drilling well The viscosity of liquid is high, and rheological characteristic is deteriorated, but is conducive to suspension stability；
3. weighting agent particles grain size is bigger, grain density is higher, the influence to viscosity is smaller, but well suspended is kept to stablize Property is more difficult to；Weighting agent particles grain size is smaller, grain density is lower, and the exacerbation dosage that the specific surface area of solid phase is bigger, required is bigger, The viscosity of drilling fluid is bigger, is more conducive to keep suspending stabilized.
It is mutually restricted and contradictory relationship in short, existing between the various factors of influence high density drilling fluid rheological characteristic. During building high density drilling fluid system, it is necessary to consider various factors, ensure the comprehensive performance of drilling fluid.
3) propose control high-temperature high-density water-base drilling fluid good rheological, leak-off, suspension stability " three low one It is thin " (low viscosity effect, low specific surface area, low frictional resistance, thin solvation film) multifactor coordinated regulation method；
For there is mutually restriction and contradictory relationship between influence high density drilling fluid rheological characteristic various factors, ensureing (by the way that temperature resistance ability is added in high density drilling fluid system in the case of good high temperature and high pressure filter loss and suspension stability Small fluid loss additive is influenced by force and on drilling fluid viscosity, the high temperature and high pressure filter loss for carrying out guarantee system is smaller, meanwhile, in system Middle addition temperature resistance ability it is strong and have both filtrate reducing effect and with the good dispersant of other inorganic agent compatibilities such as fluid loss additive, with Improve weighting material has preferable suspending power in the drilling fluid compared with low viscosity, ensures good suspension stability), it proposes Ensure the multifactor coordinated regulation method of drilling fluid good rheological：Low viscosity effect, low specific surface area, low frictional resistance, Bao Rong Agent film.As shown in figure 4, the coordinated regulation method of this " three low one is thin " is realized by following measures：
1. the inorganic agent viscosity effect for being dissolved in drilling fluid is low, under conditions of ensureing control leak-off, appropriate shear force, as far as possible Do not cause the increase of drilling fluid viscosity, the aqueous solution that the present invention seeks to the control influence maximum polymer filtrate reducer of viscosity viscous Degree, 1% aqueous solution apparent viscosity are advisable no more than 5mPas.
2. the solid phase weighting material controlled in high-density water-based drilling fluid system has lower specific surface area.According to The specific surface area of Einstein viscosity formula, solid phase weighting material has drilling fluid viscosity larger contribution.By preferably aggravating The suitable particle size and content of agent reduce it to drilling well to reduce the specific surface area of a large amount of solid phase weighting material particles in drilling fluid The influence of fluid viscosity, while the suspension and economy of heavy weight additive are taken into account, ensure the suspension stability of drilling fluid.
According to the heavy weight additive of the preferred suitable particle size of Alfred size distribution equations.
Y-is less than the content of particle D, % in formula；DL- maximum particle size；DS- minimum particle size；N-modulus.Work as n=0.37 When deposition rate highest.
In conjunction with Stokes sedimentation theories, and the requirement constructed according to actual well drilled, the maximum particle diameter of general heavy weight additive do not surpass 100 μm are crossed, the suitable particle size grading with closelypacked solid phase is calculated as shown in figure 3, illustrating granularity as maximum particle size Grading is to apply closelypacked theory, has lower viscosity when the solid phase of same weight being mainly added in realization system.
It is sieved with the classifying screen blanc fixe general to scene, the blanc fixe by different pore size is collected, as can passing through 100 μm of sieve pores and cannot be 100-75 μm of particle size range by 75 μm of sieve pores, can cannot pass through 53 μ by 75 μm of sieve pores M sieve pores are 75-53 μm of particle size range, and so on, most thin, which is, to be 20 μm of ＜ by 20 μm of sieve pores.
It is 4.2g/cm to a kind of density that scene is general3Blanc fixe sieved, later to each particle size range Powder is weighed, the result is that 100-75 μm of particle size range accounts for 0.4% weight ratio, 75-53 μm of particle size range accounts for 10.8% weight ratio, 53-37 μm of particle size range accounts for 25.6% weight ratio, and 37-25 μm of particle size range accounts for 30.8% weight ratio, 25-20 μm of grain size model That encloses accounts for 18.0% weight ratio, and grain size accounts for 14.4% weight ratio less than 20 μm.
, as a result, in conjunction with the use of actual powder body material, difference is weighed according to according to Alfred size distribution equation calculations It is used as weighting material after the blanc fixe mixing of particle size range, wherein 100-75 μm of particle size range accounts for 25% weight ratio, 75- 53 μm of particle size ranges account for 22% weight ratio, and 53-37 μm of particle size range accounts for 16% weight ratio, and 37-25 μm of particle size range accounts for 12% weight ratio, 25-20 μm of particle size range account for 2% weight ratio, and grain size accounts for 23% weight ratio less than 20 μm.
It also intuitively shows in Fig. 3, compared with the blanc fixe general with the scene without screening, is mixed after screening Heavy weight additive, weight ratio shared by the blanc fixe of 100-75 μm of particle size range is 25%, is far longer than grain size priority and matches Preceding 0.4%；Weight ratio shared by the blanc fixe of 75-53 μm of particle size range is 22%, before matching more than grain size priority 10.8%；Weight is smaller shared by the blanc fixe of 53-20 μm of particle size range；It is tightly packed to realize, while it is steady to take into account suspension Qualitative, the blanc fixe less than 20 μm accounts for 23% weight ratio, and 14.4% before matching more than grain size priority.
By above-mentioned grain size distribution measure, make in system same type is added, with the solid phase weighting material of weight when have There is more close accumulation, while also there is smaller specific surface area, to make system that there is lower viscosity.
3. according to Einstein viscosity formula, controlling solid phase particles in high density drilling fluid system has thin solvation film (according to Einstein viscosity formula as it can be seen that reducing the h and S in formula, the viscosity of system can be reduced.And solvation film h becomes It is small, it is realized by the way that the dispersant SMS-19 of oneself research and development is added in system, meanwhile, the low drop of viscosity effect is added in system Fluid loss agents and flow pattern regulator become larger also for solvation film h is avoided), the viscosity of system can be reduced.4. high density drilling well The low frictional resistance of liquid including reduced the interior frictional resistance that drilling fluid viscosity brings reduce and reduce drilling tool and drilling fluid, mud cake, the borehole wall with And the friction between casing.By grind select high density drilling fluid in the case of lubricity is good, bubble-tight lubricant SMJH-1, to reduce Friction between interface, while not causing the variation of drilling fluid rheology.
5. having developed the high-temperature high-density water base drilling fluid system with superperformance.
The key inorganic agent, including high-temperature resisting and salt-resisting fluid loss additive (CN 201110294876.8, CN 201110300021.1, CN 201110300019.4, US 8623791B2, CN 201110301222.3), high density drilling fluid The passes such as dispersant (CN 201110301295.2, GB 2495192, AU 2012218188), lubricant (201310336631.6) Key inorganic agent.
The high-temperature resisting and salt-resisting fluid loss additive PFL series of research and development, high density drilling fluid fluid loss additive SML-4, have comb shape knot Structure, containing stiffening ring and suitable adsorption group and aquation group, lower molecular weight, when playing high temperature filtrate loss controllability to boring Well liquid viscosity influence is smaller.
The high density drilling fluid dispersant SMS-19 of research and development, reacts preparation at high temperature by the substance including following components： Lignin, phenols, sulfonating agent, aldehyde compound, catalyst；Each ingredient proportion is respectively：Lignin is 10~40 weight Part, phenols are 1.5~20 parts by weight, sulfonating agent is 2.5~15 parts by weight, aldehyde compound is 0.5~5 parts by weight, catalyst For 0.5~4 parts by weight.SMS-19 contain stiffening ring, chela ring and a variety of adsorption groups and aquation group, on solid phase particles have compared with Good adsorption capacity, and solid phase is controlled with relatively thin hydration shell, so that a large amount of solid phase easily disperseed in drilling fluid, suspended, protects Hinder the rheological characteristic and stability of drilling fluid system.
The lubricant SMJH-1 elements containing extreme pressure of research and development, can form coordinate bond, adsorption capacity is strong, in drilling tool between Fe atoms Surface forms secured lubricating film；Friction chemical reaction can occur for extreme pressure element under high extreme pressure, generate lubricating film, reduce rubbing surface Roughness, improve lubricity；The hydrophobicity of surface of drill stem is improved, drilling fluid flow resistance is reduced.SMJH-1 includes with the following group Point：Macromolecular sulfurised ester, silane coupling agent, emulsifier and base oil etc.；Each ingredient proportion is respectively macromolecular sulfurised ester For 5~80 parts by weight, silane coupling agent is 1~15 parts by weight, and emulsifier is 1~15 parts by weight, and base oil is 10~90 weight Part.
By these crucial inorganic agent compatible uses, the high-temperature high-density water base drilling fluid system with superperformance is formd (CN 201110301302.9)。
One kind having following ranges component, 2.7~3.0g/cm of density3Salt resistance ultra high density drilling fluid (each component weight Percent by volume (w/v)), drilling fluid rheology is easily controllable, high temperature and high pressure filter loss is small, suspension stability is good under high temperature.
It is 2.74g/cm to prepare density with the material in said components and range3Drilling fluid, before 120 DEG C of high temperature ageings Performance afterwards is as shown in table 2.
Table 2
For the high-density water-based drilling fluid system of formation before and after high temperature ageing, rheological characteristic and suspension stability are good, middle pressure Small with high temperature and high pressure filter loss, lubricity is good.
A kind of high-temperature high-density property of drilling fluid provided by the invention regulates and controls method, is high-temperature high-density water-based drilling liquid System's structure, crucial inorganic agent research and development and high-temperature high-density of the formation with good leak-off, rheological characteristic and suspension stability are water base Property of drilling fluid regulates and controls thinking and control method provides solid theoretical foundation and Research Thinking.It is researched and developed according to the method Crucial inorganic agent and high-temperature high-density water base drilling fluid system are answered at scenes such as Sinopec emphasis well Xuwen X3 wells, deep 1 wells of official With high density drilling fluid does not thicken under high temperature, rheological characteristic is easily controllable, high temperature and high pressure filter loss is small, suspension stability is good, application It works well.
With going deep into for oil-gas exploration and development, deep-well, the probing of bad ground are more and more, and bottom hole temperature (BHT) is often up to 200 DEG C or more, underground high temperature seriously affects the properties of drilling fluid, and especially in saliferous strata, high temperature leads to the change in drilling fluid Agent failure is learned, drilling fluid is thickened or dilutes serious, weighting material sedimentation, high temperature and high pressure filter loss is difficult to control etc., it influences to construct Quality and construction cost.The implementation of the invention will be to further increase China's high-temperature salt-resistant high density drilling fluid technology water with application It is flat that solid theoretical foundation and Research Thinking are provided, it has broad application prospects.
Above-mentioned technical proposal is one embodiment of the present invention, for those skilled in the art, at this On the basis of disclosure of the invention application process and principle, it is easy to make various types of improvement or deformation, be not limited solely to this Invent method described in above-mentioned specific implementation mode, therefore previously described mode is only preferred, and and without limitation The meaning of property.

Claims (6)

1. a kind of high-temperature high-density water-base drilling fluid performance regulates and controls method, it is characterised in that：The method is viscous by reducing liquid phase It spends, reduce frictional resistance, reducing specific surface area and reduce solvation film thickness so that high-density water-based drilling fluid has high temperature resistance, resists Pollution, height take rock, strong lubricating ability and good rheological property.
2. high-temperature high-density water-base drilling fluid performance according to claim 1 regulates and controls method, it is characterised in that：The reduction What liquid phase viscosity was realized in：
Temperature resistance ability is added by force in high-density water-based drilling fluid and small fluid loss additive and flow pattern tune are influenced on drilling fluid viscosity Save agent；
The fluid loss additive meets：The apparent viscosity of the aqueous solution of 5% dosage of fluid loss additive is within 15mPas；It polymerize species The apparent viscosity of 1% aqueous solution of fluid loss additive is within 5mPas.
3. high-temperature high-density water-base drilling fluid performance according to claim 2 regulates and controls method, it is characterised in that：The reduction What frictional resistance was realized in：
It is added in high-density water-based drilling fluid high density drilling fluid lubricity is good, bubble-tight lubricant reduces Frictional resistance；
The lubricant includes following components：Macromolecular sulfurised ester, silane coupling agent, emulsifier and base oil；Shared by each ingredient Ratio is respectively：Macromolecular sulfurised ester is 5~80 parts by weight, and silane coupling agent is 1~15 parts by weight, and emulsifier is 1~15 weight Part is measured, base oil is 10~90 parts by weight.
4. high-temperature high-density water-base drilling fluid performance according to claim 3 regulates and controls method, it is characterised in that：The reduction Specific surface area is realized by the suitable particle size and content of preferred barite, specific as follows：
According to the heavy weight additive of the preferred suitable particle size of Alfred size distribution equations：
Y is the content less than particle D in above formula, and unit is %；DLFor maximum particle size；DSFor minimum particle size；N is modulus, works as n= Deposition rate highest when 0.37；
In conjunction with Stokes sedimentation theories, and the requirement constructed according to actual well drilled, the maximum particle diameter of heavy weight additive are no more than 100 μm, The suitable particle size grading with closelypacked solid phase is calculated as maximum particle size；
It is sieved to blanc fixe with classifying screen, the blanc fixe by different pore size is collected, as can by 100 μm of sieve pores It cannot be 100-75 μm of particle size range by 75 μm of sieve pores, can cannot be by 53 μm of sieve pores by 75 μm of sieve pores 75-53 μm of particle size range, and so on obtain 53-37 μm of particle size range, 37-25 μm of particle size range, 25-20 μm of grain size Range, most thin, which is, to be 20 μm of ＜ by 20 μm of sieve pores；Then it weighs, obtains to the blanc fixe of each particle size range To the blanc fixe weight ratio of each particle size range；
, as a result, in conjunction with the use of actual powder body material, different-grain diameter is weighed according to according to Alfred size distribution equation calculations It is used as heavy weight additive after the blanc fixe mixing of range, wherein 100-75 μm of particle size range accounts for 25% weight ratio, 75-53 μm of grain Diameter range accounts for 22% weight ratio, and 53-37 μm of particle size range accounts for 16% weight ratio, and 37-25 μm of particle size range accounts for 12% weight Ratio is measured, 25-20 μm of particle size range accounts for 2% weight ratio, and grain size accounts for 23% weight ratio less than 20 μm.
5. high-temperature high-density water-base drilling fluid performance according to claim 4 regulates and controls method, it is characterised in that：The reduction Solvation film thickness is realized in：
Dispersant is added in high-density water-based drilling fluid to reduce solvation film thickness, the dispersant is passed through using following components Pyroreaction is prepared：Lignin, phenols, sulfonating agent, aldehyde compound, catalyst and water；Each ingredient proportion difference For：Lignin is 10~40 parts by weight, phenols is 1.5~20 parts by weight, sulfonating agent is 2.5~15 parts by weight, aldehyde compound For 0.5~5 parts by weight, catalyst be 0.5~4 parts by weight, water is 100 parts by weight.
6. high-temperature high-density water-base drilling fluid performance according to claim 5 regulates and controls method, it is characterised in that：The method It is that the dispersant, fluid loss additive, flow pattern regulator and lubricant are sequentially added in water-based drilling liquid-based slurry, stirring to dissolving The ratio barite is added after being uniformly dispersed.
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CN115838587A (en) * 2022-11-11 2023-03-24 荆州嘉华科技有限公司 Water-based drilling fluid barite high-temperature suspension stabilizing method

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CN103013468A (en) * 2011-09-28 2013-04-03 中国石油化工股份有限公司 Salt-resistant drilling fluid with super-high density, preparation method and application thereof

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Publication number Priority date Publication date Assignee Title
CN103013468A (en) * 2011-09-28 2013-04-03 中国石油化工股份有限公司 Salt-resistant drilling fluid with super-high density, preparation method and application thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115838587A (en) * 2022-11-11 2023-03-24 荆州嘉华科技有限公司 Water-based drilling fluid barite high-temperature suspension stabilizing method
CN115838587B (en) * 2022-11-11 2024-05-28 荆州嘉华科技有限公司 High-temperature suspension stabilization method for barite of water-based drilling fluid

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