CN103074042A - Drilling fluid and preparation method thereof - Google Patents
Drilling fluid and preparation method thereof Download PDFInfo
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- CN103074042A CN103074042A CN2013100428096A CN201310042809A CN103074042A CN 103074042 A CN103074042 A CN 103074042A CN 2013100428096 A CN2013100428096 A CN 2013100428096A CN 201310042809 A CN201310042809 A CN 201310042809A CN 103074042 A CN103074042 A CN 103074042A
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Abstract
The invention discloses drilling fluid and a preparation method thereof. The drilling fluid disclosed by the invention comprises the following components of: Ng of water, 0.001Ng of anhydrous sodium carbonate, 0.001Ng of sodium hydroxide, 0.005Ng-0.01Ng of fluid loss agent, 0.005Ng-0.01Ng of tackifier, 0.001Ng-0.004Ng of foaming agent and 0.001Ng-0.004Ng of foam stabilizer, wherein N is a positive number. The drilling fluid disclosed by the invention can be used for solving the problems that the traditional nitrogen foam and foam leaking stoppage fluid are high in cost and difficult for adjusting density and is suitable for the strata problem of a multi-pressure system.
Description
Technical field
The present invention relates to the oilfield drilling technical field of petroleum industry, particularly relate to the preparation method of a kind of drilling fluid and a kind of drilling fluid.
Background technology
Drilling fluid is for the drilling process equilibrium strata pressure, guarantees one of indispensable material that safety is crept into smoothly.In the drilling process, when reservoir pressure during less than fluid column pressure, the leakage phenomenon that the working fluids such as drilling fluid, well finishing liquid, workover fluid bleed the stratum in a large number can appear.Leakage can cause down-hole accident or complexcase, causes the engineering time to prolong, and operating cost increases, or even Oil/gas Well scraps, and then causes the serious wasting of resources and tremendous economic loss.At present, the most of oil gas field is in the exploitation middle and later periods, leakage is on the rise, bore in the oil-gas exploration and development process and meet the leakage stratum, well the balance formation fluid pressure causes blowout or hole collapse, drilling fluid leakage will make to creep into smoothly and run into many difficulties, cause drilling cost to roll up, even Oil/gas Well is scrapped normally shaft building.
In order to prevent the drilling fluid stratum of bleeding, rapid successful shutoff leakage channel after perhaps leakage occurs, recover as early as possible to creep into, plugging agent is attestedly can prevent one of effective treatment agent of formation leakage, determine but plugging agent particle and blocking radius are difficult, easily injure reservoir, for the stratum of many covers pressure system, use plugging agent and foam class drilling fluid effect poorer, can not well solve the drilling fluid leakage problem in the drilling well.Nitrogen foam and foam can solve the formation leakage problem to a certain extent.But it is many that nitrogen foam exists the cost height, equipment is employed at the scene, and there is Auto-regulating System of Density of Heavy Medium difficulty in foam, to problems such as multiple pressure power system stratum are inapplicable, these deficiencies have limited its application in exploratory development.
In sum, existing nitrogen foam and foam leakage-stop liquid exist cost high, and the density refractory adjustment is not suitable for the problem on multiple pressure power system stratum.
Summary of the invention
The invention provides a kind of drilling fluid, this drilling fluid can solve existing nitrogen foam and foam leakage-stop liquid and exist cost high, and the density refractory adjustment is not suitable for the problem on multiple pressure power system stratum.
The present invention also provides a kind of method for preparing drilling fluid, and the drilling fluid that the method is prepared can solve existing nitrogen foam and foam leakage-stop liquid and exist cost high, and the density refractory adjustment is not suitable for the problem on multiple pressure power system stratum.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides a kind of drilling fluid, the consisting of of described drilling fluid:
The water of N gram, N is positive number;
0.001N the anhydrous sodium carbonate of gram;
0.001N the sodium hydroxide of gram;
0.005N the water retaining of gram-0.01N gram;
0.005N the tackifier of gram-0.01N gram;
0.001N the whipping agent of gram-0.004N gram;
0.001N the suds-stabilizing agent of gram-0.004N gram.
In above-mentioned drilling fluid, described drilling fluid also comprises one or more in the following treatment agent:
0.03N the clay inhibitor of gram-0.05N gram;
0.01N the temperature stabilising agent of gram-0.03N gram;
0.001N the sterilant of gram-0.003N gram.
In above-mentioned drilling fluid, described water retaining comprises one or more in the following treatment agent: carboxymethyl starch, Polyanionic Cellulose;
And/or,
Described tackifier comprise one or more in the following treatment agent: the multipolymer of xanthan gum, hydroxypropyl guar, acrylate; Perhaps, described tackifier comprise oxygen scavenger and following one or more: the multipolymer of xanthan gum, hydroxypropyl guar, acrylate;
And/or,
Described whipping agent comprises one or more in the following treatment agent: sodium laurylsulfonate, polyoxyethylene octyl phenol ether, OA-12, dodecyl sulphate tri ethanol ammonium salt;
And/or,
Described suds-stabilizing agent comprises one or more in the following treatment agent: trolamine, ethanol, lauryl alcohol;
And/or,
Described clay inhibitor comprises one or both in the following treatment agent: Repone K, small cation;
And/or,
Described temperature stabilising agent comprises one or more in the following treatment agent: low-molecular(weight)polymer stablizer, Molecularly Imprinted Polymer stablizer, sulfonated phenol formaldehyde resin and modifier thereof, chromate, sulfonated lignite modifier, organic sulfonated polymer class;
And/or,
Described sterilant comprises one or more in the following treatment agent: glutaraldehyde, acetic acid, Peracetic Acid, lactic acid, propionic acid.
In above-mentioned drilling fluid, described water retaining comprises: carboxymethyl starch and Polyanionic Cellulose; Wherein, the mass ratio of carboxymethyl starch and Polyanionic Cellulose is a:1; The span of a is 3 ~ 5;
And/or,
Described tackifier comprise: xanthan gum, hydroxypropyl guar and oxygen scavenger; Wherein, the mass ratio of xanthan gum, hydroxypropyl guar and oxygen scavenger is b:c:5; The span of b is that the span of 2 ~ 4, c is 3 ~ 1;
And/or,
Described whipping agent comprises: sodium laurylsulfonate, polyoxyethylene octyl phenol ether, OA-12 and dodecyl sulphate tri ethanol ammonium salt; Wherein, the mass ratio of sodium laurylsulfonate, polyoxyethylene octyl phenol ether, OA-12 and dodecyl sulphate tri ethanol ammonium salt is d:1:1:1; The span of d is 1 ~ 3;
And/or,
Described suds-stabilizing agent comprises: trolamine, ethanol and lauryl alcohol; Wherein, the mass ratio of trolamine, ethanol and lauryl alcohol is 1:1:e; The span of e is 1 ~ 2.
In above-mentioned drilling fluid, consisting of in this drilling fluid:
The water of N gram, N is positive number;
0.001N the anhydrous sodium carbonate of gram;
0.001N the sodium hydroxide of gram;
0.005N the water retaining of gram; The mass ratio of carboxymethyl starch and Polyanionic Cellulose is 3:1 in this water retaining;
0.005N the tackifier of gram; The mass ratio of xanthan gum, hydroxypropyl guar and oxygen scavenger is 2:3:5 in these tackifier;
0.001N the whipping agent of gram, the mass ratio of sodium laurylsulfonate, polyoxyethylene octyl phenol ether, OA-12 and dodecyl sulphate tri ethanol ammonium salt is 1:1:1:1 in this whipping agent;
0.001N the suds-stabilizing agent of gram, the mass ratio of trolamine, ethanol and lauryl alcohol is 1:1:1 in this suds-stabilizing agent;
0.03N the clay inhibitor of gram, this clay inhibitor is Repone K;
0.01N the temperature stabilising agent of gram, this temperature stabilising agent is the low-molecular(weight)polymer stablizer;
0.001N the sterilant of gram, this sterilant is glutaraldehyde.
In above-mentioned drilling fluid, consisting of in this drilling fluid:
The water of N gram, N is positive number;
0.001N the anhydrous sodium carbonate of gram;
0.001N the sodium hydroxide of gram;
0.006N the water retaining of gram; The mass ratio of carboxymethyl starch and Polyanionic Cellulose is 4:1 in this water retaining;
0.008N the tackifier of gram; The mass ratio of xanthan gum, hydroxypropyl guar and oxygen scavenger is 3:2:5 in these tackifier;
0.002N the whipping agent of gram, the mass ratio of sodium laurylsulfonate, polyoxyethylene octyl phenol ether, OA-12 and dodecyl sulphate tri ethanol ammonium salt is 2:1:1:1 in this whipping agent;
0.002N the suds-stabilizing agent of gram, the mass ratio of trolamine, ethanol and lauryl alcohol is 1:1:2 in this suds-stabilizing agent;
0.04N the clay inhibitor of gram, this clay inhibitor is Repone K;
0.02N the temperature stabilising agent of gram, this temperature stabilising agent is the low-molecular(weight)polymer stablizer;
0.002N the sterilant of gram, this sterilant is glutaraldehyde.
In above-mentioned drilling fluid, consisting of in this drilling fluid:
The water of N gram, N is positive number;
0.001N the anhydrous sodium carbonate of gram;
0.001N the sodium hydroxide of gram;
0.008N the water retaining of gram; The mass ratio of carboxymethyl starch and Polyanionic Cellulose is 5:1 in this water retaining;
0.01N the tackifier of gram; The mass ratio of xanthan gum, hydroxypropyl guar and oxygen scavenger is 4:1:5 in these tackifier;
0.003N the whipping agent of gram, the mass ratio of sodium laurylsulfonate, polyoxyethylene octyl phenol ether, OA-12 and dodecyl sulphate tri ethanol ammonium salt is 3:1:1:1 in this whipping agent;
0.003N the suds-stabilizing agent of gram, the mass ratio of trolamine, ethanol and lauryl alcohol is 1:1:2 in this suds-stabilizing agent;
0.05N the clay inhibitor of gram, this clay inhibitor is Repone K;
0.03N the temperature stabilising agent of gram, this temperature stabilising agent is the low-molecular(weight)polymer stablizer;
0.003N the sterilant of gram, this sterilant is glutaraldehyde.
In above-mentioned drilling fluid, the moisture content of described water retaining≤5%;
And/or,
The moisture content of described tackifier≤15%;
And/or,
The base fluid froth quality of described whipping agent 〉=20%;
And/or,
The volume compressibility of described suds-stabilizing agent 〉=15%.
In above-mentioned drilling fluid, the method comprises:
In N gram water, add while stirring the anhydrous sodium carbonate of 0.001N gram, the sodium hydroxide of 0.001N gram, the water retaining of 0.005N gram-0.01N gram, the tackifier of 0.005N gram-0.01N gram, the whipping agent of 0.001N gram-0.004N gram, the suds-stabilizing agent of 0.001N gram-0.004N gram.
In aforesaid method, the method also comprises: add while stirring in the following component one or more in described drilling fluid:
0.03N the clay inhibitor of gram-0.05N gram; 0.01N the temperature stabilising agent of gram-0.03N gram; 0.001N the sterilant of gram-0.003N gram.
In sum, drilling fluid provided by the invention is mainly as the leak-proof leak-stopping of leakage stratum when creeping into, and it has leak-off, the lubricated effect of falling simultaneously concurrently; Drilling fluid provided by the invention has overcome the shortcoming that the nitrogen foam configuration device is numerous and jumbled, foam density is controlled difficulty, dosing apparatus is simple and easy, density is adjusted easy advantage, drilling fluid provided by the invention has solved the problem that leakage easily occurs in the low pressure and easy leaking strata drilling process, but the bearing capacity on Effective Raise stratum.
Description of drawings
Fig. 1 is the schema of a kind of collocation method of drilling fluid among the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
Technical scheme of the present invention is achieved in that in order to achieve the above object
Fig. 1 is the schema of a kind of collocation method of drilling fluid among the present invention.As shown in Figure 1,
Step 101, at the water of N gram, N is positive number; The anhydrous sodium carbonate that adds successively while stirring the 0.001N gram; 0.001N the sodium hydroxide of gram; 0.005N the water retaining of gram-0.01N gram; 0.005N the tackifier of gram-0.01N gram; 0.001N the whipping agent of gram-0.004N gram; 0.001N the suds-stabilizing agent of gram-0.004N gram.
In an embodiment of the present invention, N gram water can be distilled water, natural fresh water or the fresh water through processing in the drilling fluid.
Water retaining comprises one or more in the following treatment agent: carboxymethyl starch, Polyanionic Cellulose.
Tackifier comprise one or more in the following treatment agent: the multipolymer of xanthan gum, hydroxypropyl guar, acrylate; Perhaps, tackifier comprise oxygen scavenger and following one or more: the multipolymer of xanthan gum, hydroxypropyl guar, acrylate.Wherein, in an embodiment of the present invention, that specifically adopt is acrylate multipolymer 80A51.
Whipping agent comprises one or more in the following treatment agent: sodium laurylsulfonate, polyoxyethylene octyl phenol ether, OA-12, dodecyl sulphate tri ethanol ammonium salt.
Suds-stabilizing agent comprises one or more in the following treatment agent: trolamine, ethanol, lauryl alcohol.
In specific embodiments of the invention, water retaining comprises: carboxymethyl starch and Polyanionic Cellulose; Wherein, the mass ratio of carboxymethyl starch and Polyanionic Cellulose is a:1; The span of a is 3 ~ 5; In of the present invention, the moisture content of the water retaining that disposes≤5%, the pH value that is mixed with behind 1% aqueous solution is 8～10, apparent viscosity 20～35mPas, phase increase 〉=120min declines; Wherein, water retaining is mainly used in forming outside the gas nuclear in this drilling fluid system, and the rete of parcel gas nuclear begins to take shape structure.Water retaining among the present invention is compared with other treatment agent with similar effect in the prior art, not only can effectively increase layer thickness, can also outside gas nuclear, form the glutinous layer of height of parcel gas nuclear, can prevent effectively that gas is overflowed in the gas nuclear, keep gas nuclear stable, improve intensity.And this water retaining of the present invention is good with the treatment agent compatibleness with general drilling fluid, and this water retaining is nontoxic, harmless, but is environment acceptance type treatment agent.
In specific embodiments of the invention, tackifier comprise: xanthan gum, hydroxypropyl guar and oxygen scavenger; Wherein, the mass ratio of xanthan gum, hydroxypropyl guar and oxygen scavenger is b:c:1; The span of b is that the span of 2 ~ 4, c is 3 ~ 1; In the present invention, the moisture content of the tackifier that dispose≤15%, and the pH value that these tackifier are mixed with behind 1.0% aqueous solution is 6.0～7.0, apparent viscosity 10～20mPas, steady time 〉=24h; Wherein, tackifier are mainly used in stablizing in the drilling fluid system, and it is little to have a consumption, have simultaneously the effect of the drilling fluid of adjusting flow pattern.Tackifier of the present invention are applicable to the temperature environment less than or equal to 120 ℃, compare with other treatment agent with similar effect in the prior art, not only can effectively stablize in the drilling fluid, the unstable situation of gas-liquid layering, system that occurs that prevents from floating occurs, and can regulate the drilling fluid flow pattern, make drilling fluid viscosity under high shear rate lower, make drilling fluid have good rheological, be conducive to brokenly rock; Viscosity is higher under low shear rate, is conducive to cutting carring.And these tackifier of the present invention are good with the treatment agent compatibleness with general drilling fluid, and these tackifier are nontoxic, harmless, but are environment acceptance type treatment agent.
In specific embodiments of the invention, whipping agent comprises: sodium laurylsulfonate, polyoxyethylene octyl phenol ether, OA-12 and dodecyl sulphate tri ethanol ammonium salt; Wherein, the mass ratio of sodium laurylsulfonate, polyoxyethylene octyl phenol ether, OA-12 and dodecyl sulphate tri ethanol ammonium salt is d:1:1:1; The span of d is 1 ~ 3; In the present invention, the pH value 7.0～9.0 of the whipping agent that disposes, density 0.90～1.00g/cm3, base fluid froth quality 〉=20%, base fluid transformation period 〉=120.0min, 10% sodium ion water bubble quality 〉=50%, 5% calcium ion water bubble quality 〉=50%; Wherein, the whipping agent among the present invention is applicable to the temperature environment less than or equal to 120 ℃, is mainly used in nucleation in drilling fluid system, can effectively fully form gas nuclear in system.This whipping agent is compared with other treatment agent with similar effect in the prior art, has the advantages that consumption is little, nucleogenesis is strong, also has the characteristics such as anti-salt, anticalcium ability is strong.And this whipping agent of the present invention is good with the treatment agent compatibleness with general drilling fluid, and this whipping agent is nontoxic, harmless, but is environment acceptance type treatment agent.
Suds-stabilizing agent comprises: trolamine, ethanol and lauryl alcohol; Wherein, the mass ratio of trolamine, ethanol and lauryl alcohol is 1:1:e; The span of e is 1 ~ 2.In the present invention, the pH value of the suds-stabilizing agent that disposes is 5.0～7.0, density 0.7～1.0g/cm3, volume compressibility 〉=15%.Wherein, this suds-stabilizing agent is mainly used in forming the rete of parcel gas nuclear outside gas nuclear, begin to take shape structure.Suds-stabilizing agent of the present invention is applicable to the temperature environment less than or equal to 120 ℃, compare with other treatment agent with similar effect in the prior art, not only can effectively reduce gas nuclear and surface tension continuously, can also outside gas nuclear, form the glutinous layer of height of parcel gas nuclear, can prevent effectively that gas is overflowed in the gas nuclear, keep gas nuclear stable, improve intensity.And this suds-stabilizing agent of the present invention is good, nontoxic, harmless with the treatment agent compatibleness with general drilling fluid, but is environment acceptance type treatment agent.
Because in specific operation process of the present invention, the clay borehole wall occurs easily and expand, perhaps the excess Temperature on stratum so that in the drilling fluid each treatment agent effect not obvious, the perhaps phenomenon such as rotten.In other embodiments of the invention, this drilling fluid also comprises one or more in the following treatment agent: the clay inhibitor of 0.03N gram-0.05N gram; 0.01N the temperature stabilising agent of gram-0.03N gram; 0.001N the sterilant of gram-0.003N gram.
Clay inhibitor comprises one or both in the following treatment agent: Repone K, small cation; Wherein, small cation is diallyldimethylammonium chloride; This clay inhibitor is used for preventing that the clay borehole wall from expanding the phenomenon that well wall dropping block occurs or cave in.When adopting Repone K as clay inhibitor, can reach stronger inhibition clay and the ability of drilling cuttings dispersion, improve the inhibition of drilling fluid, be conducive to the stable of solid phase control and the borehole wall.
Temperature stabilising agent comprises one or more in the following treatment agent: low-molecular(weight)polymer stablizer, sulfonated phenol formaldehyde resin and modifier thereof, chromate, sulfonated lignite modifier, organic sulfonated polymer class; Wherein, in an embodiment of the present invention, this temperature stabilising agent is specially low-molecular(weight)polymer stablizer PC-J10S.
Temperature stabilising agent is used for the temperature on temperature stratum, prevents excess Temperature so that the various treatment agents in the drilling fluid lost efficacy.
Sterilant comprises one or more in the following treatment agent: glutaraldehyde, acetic acid, Peracetic Acid, lactic acid, propionic acid.This sterilant is used for preventing under higher temperature, and under long duration of service, so that the various handlers in the drilling fluid are rotten.
In concrete use procedure of the present invention, water retaining and tackifier partition do not made 1.0% and 1.0% glue and use, in base fluid, add whipping agent and other class treatment agents according to prescription, after fully shearing, circulation above use half an hour.Should replenish simultaneously whipping agent and glue when replenishing new slurry in the drilling process, be used for adjusting rheological.
In order to make technical scheme of the present invention clearer, clear, below enumerate specific embodiment technical scheme of the present invention is further specified book.
Embodiment one
The water of consisting of in the present embodiment in the drilling fluid: N gram, N is positive number; 0.001N the anhydrous sodium carbonate of gram; 0.001N the sodium hydroxide of gram; 0.005N the water retaining of gram; The mass ratio of carboxymethyl starch and Polyanionic Cellulose is 3:1 in this water retaining; 0.005N the tackifier of gram; The mass ratio of xanthan gum, hydroxypropyl guar and oxygen scavenger is 2:3:5 in these tackifier; 0.001N the whipping agent of gram, the mass ratio of sodium laurylsulfonate, polyoxyethylene octyl phenol ether, OA-12 and dodecyl sulphate tri ethanol ammonium salt is 1:1:1:1 in this whipping agent; 0.001N the suds-stabilizing agent of gram, the mass ratio of trolamine, ethanol and lauryl alcohol is 1:1:1 in this suds-stabilizing agent; 0.03N the clay inhibitor of gram, this clay inhibitor is Repone K; 0.01N the temperature stabilising agent of gram, this temperature stabilising agent is the low-molecular(weight)polymer stablizer; 0.001N the sterilant of gram, this sterilant is glutaraldehyde.
Wherein the value of N is 400, then in the present embodiment, this drilling fluid comprises: water 400g, anhydrous sodium carbonate 0.40g, sodium hydroxide 0.40g, water retaining 2.00g(are comprised of with ratio of quality and the number of copies 3:1 carboxymethyl starch and Polyanionic Cellulose), tackifier 2.00g(is comprised of with ratio of quality and the number of copies 2:3:5 xanthan gum, hydroxypropyl guar and oxygen scavenger Na2SO3, wherein, the number-average molecular weight of yellow collagen is 2 * 106g/mol); Whipping agent 0.40g(is comprised of with ratio of quality and the number of copies 1:1:1:1 sodium laurylsulfonate, polyoxyethylene octyl phenol ether, OA-12 and four kinds of materials of dodecyl sulphate tri ethanol ammonium salt); Suds-stabilizing agent 0.40g(is comprised of with ratio of quality and the number of copies 1:1:1 trolamine, ethanol and three kinds of materials of lauryl alcohol); Clay inhibitor KCl12.0g; Temperature stabilising agent 4.0g, sterilant glutaraldehyde 0.4g.
According to the ratio of above-mentioned each treatment agent, under agitation condition, Xiang Shuizhong adds successively anhydrous sodium carbonate, sodium hydroxide, water retaining, tackifier, whipping agent, suds-stabilizing agent, clay inhibitor, temperature stabilising agent, sterilant and is mixed with drilling fluid No. 1.Wherein, the speed of stirring can be controlled at about 5000rpm.
Embodiment two
The water of consisting of in the present embodiment in the drilling fluid: N gram, N is positive number; 0.001N the anhydrous sodium carbonate of gram; 0.001N the sodium hydroxide of gram; 0.006N the water retaining of gram; The mass ratio of carboxymethyl starch and Polyanionic Cellulose is 4:1 in this water retaining; 0.008N the tackifier of gram; The mass ratio of xanthan gum, hydroxypropyl guar and oxygen scavenger is 3:2:5 in these tackifier; 0.002N the whipping agent of gram, the mass ratio of sodium laurylsulfonate, polyoxyethylene octyl phenol ether, OA-12 and dodecyl sulphate tri ethanol ammonium salt is 2:1:1:1 in this whipping agent; 0.002N the suds-stabilizing agent of gram, the mass ratio of trolamine, ethanol and lauryl alcohol is 1:1:2 in this suds-stabilizing agent; 0.04N the clay inhibitor of gram, this clay inhibitor is Repone K; 0.02N the temperature stabilising agent of gram, this temperature stabilising agent is the low-molecular(weight)polymer stablizer; 0.002N the sterilant of gram, this sterilant is glutaraldehyde.
Wherein the value of N is 400, then in the present embodiment, this drilling fluid comprises: water 400g, anhydrous sodium carbonate 0.40g, sodium hydroxide 0.40g, water retaining 2.40g(is comprised of with ratio of quality and the number of copies 4:1 carboxymethyl starch and Polyanionic Cellulose), tackifier 3.20g(is by xanthan gum, hydroxypropyl guar and oxygen scavenger Na2SO3 form with ratio of quality and the number of copies 3:2:5, wherein, the number-average molecular weight of yellow collagen is 1.5 * 107g/mol), whipping agent 0.80g(is by sodium laurylsulfonate, polyoxyethylene octyl phenol ether, four kinds of materials of OA-12 and dodecyl sulphate tri ethanol ammonium salt form with ratio of quality and the number of copies 2:1:1:1); Suds-stabilizing agent 0.80g(is comprised of with ratio of quality and the number of copies 1:1:2 trolamine, ethanol and three kinds of materials of lauryl alcohol); Clay inhibitor KCl16.0g; Temperature stabilising agent 8.0g; Sterilant glutaraldehyde 0.8g.
According to the ratio of above-mentioned each treatment agent, under agitation condition, Xiang Shuizhong adds successively anhydrous sodium carbonate, sodium hydroxide, water retaining, tackifier, whipping agent, suds-stabilizing agent, clay inhibitor, temperature stabilising agent, sterilant and is mixed with drilling fluid No. 2.Wherein, the speed of stirring can be controlled at about 5000rpm.
Embodiment three
The water of consisting of in the present embodiment in the drilling fluid: N gram, N is positive number; 0.001N the anhydrous sodium carbonate of gram; 0.001N the sodium hydroxide of gram; 0.008N the water retaining of gram; The mass ratio of carboxymethyl starch and Polyanionic Cellulose is 5:1 in this water retaining; 0.01N the tackifier of gram; The mass ratio of xanthan gum, hydroxypropyl guar and oxygen scavenger is 4:1:5 in these tackifier; 0.003N the whipping agent of gram, the mass ratio of sodium laurylsulfonate, polyoxyethylene octyl phenol ether, OA-12 and dodecyl sulphate tri ethanol ammonium salt is 3:1:1:1 in this whipping agent; 0.003N the suds-stabilizing agent of gram, the mass ratio of trolamine, ethanol and lauryl alcohol is 1:1:2 in this suds-stabilizing agent; 0.05N the clay inhibitor of gram, this clay inhibitor is Repone K; 0.03N the temperature stabilising agent of gram, this temperature stabilising agent is the low-molecular(weight)polymer stablizer; 0.003N the sterilant of gram, this sterilant is glutaraldehyde.
Wherein the value of N is 400, then in the present embodiment, this drilling fluid comprises: water 400g, anhydrous sodium carbonate 0.40g, sodium hydroxide 0.40g, water retaining 3.20g(is comprised of with ratio of quality and the number of copies 5:1 carboxymethyl starch and Polyanionic Cellulose), tackifier 4.00g(is by xanthan gum, hydroxypropyl guar and oxygen scavenger Na2SO3 form with ratio of quality and the number of copies 4:1:5, wherein, the number-average molecular weight of yellow collagen is 2 * 107g/mol), whipping agent 1.20g(is by sodium laurylsulfonate, polyoxyethylene octyl phenol ether, four kinds of materials of OA-12 and dodecyl sulphate tri ethanol ammonium salt form with ratio of quality and the number of copies 3:1:1:1), suds-stabilizing agent 1.20g(is by trolamine, three kinds of materials of ethanol and lauryl alcohol form with ratio of quality and the number of copies 1:1:2), clay inhibitor KCl20.0g, temperature stabilising agent low-molecular(weight)polymer stablizer 12.0g, sterilant glutaraldehyde 1.2g.
According to the ratio of above-mentioned each treatment agent, under agitation condition, Xiang Shuizhong adds successively anhydrous sodium carbonate, sodium hydroxide, water retaining, tackifier, whipping agent, suds-stabilizing agent, clay inhibitor, temperature stabilising agent, sterilant and is mixed with drilling fluid No. 3.Wherein, the speed of stirring can be controlled at about 5000rpm.
Embodiment four
The water of consisting of in the present embodiment in the drilling fluid: N gram, N is positive number; 0.001N the anhydrous sodium carbonate of gram; 0.001N the sodium hydroxide of gram; 0.009N the water retaining of gram; The mass ratio of carboxymethyl starch and Polyanionic Cellulose is 3:1 in this water retaining; 0.012N the tackifier of gram; The mass ratio of xanthan gum, hydroxypropyl guar and oxygen scavenger is 2:3:5 in these tackifier; 0.0035N the whipping agent of gram, the mass ratio of sodium laurylsulfonate, polyoxyethylene octyl phenol ether, OA-12 and dodecyl sulphate tri ethanol ammonium salt is 1:1:1:1 in this whipping agent; 0.003N the suds-stabilizing agent of gram, the mass ratio of trolamine, ethanol and lauryl alcohol is 1:1:2 in this suds-stabilizing agent; 0.05N the clay inhibitor of gram, this clay inhibitor is Repone K; 0.03N the temperature stabilising agent of gram, this temperature stabilising agent is the low-molecular(weight)polymer stablizer; 0.003N the sterilant of gram, this sterilant is glutaraldehyde.
Wherein the value of N is 400, then in the present embodiment, this drilling fluid comprises: water 400g, anhydrous sodium carbonate 0.40g, sodium hydroxide 0.40g, water retaining 3.20g(is comprised of with ratio of quality and the number of copies 5:1 carboxymethyl starch and Polyanionic Cellulose), tackifier 4.00g(is by xanthan gum, hydroxypropyl guar and oxygen scavenger Na2SO3 form with ratio of quality and the number of copies 4:1:5, wherein, the number-average molecular weight of yellow collagen is 2 * 107g/mol), whipping agent 1.20g(is by sodium laurylsulfonate, polyoxyethylene octyl phenol ether, four kinds of materials of OA-12 and dodecyl sulphate tri ethanol ammonium salt form with ratio of quality and the number of copies 3:1:1:1), suds-stabilizing agent 1.20g(is by trolamine, three kinds of materials of ethanol and lauryl alcohol form with ratio of quality and the number of copies 1:1:2), clay inhibitor KCl20.0g, temperature stabilising agent low-molecular(weight)polymer stablizer 12.0g, sterilant glutaraldehyde 1.2g.
According to the ratio of above-mentioned each treatment agent, under agitation condition, Xiang Shuizhong adds successively anhydrous sodium carbonate, sodium hydroxide, water retaining, tackifier, whipping agent, suds-stabilizing agent, clay inhibitor, temperature stabilising agent, sterilant and is mixed with drilling fluid No. 4.Wherein, the speed of stirring can be controlled at about 5000rpm.
Embodiment five
The water of consisting of in the present embodiment in the drilling fluid: N gram, N is positive number; 0.001N the anhydrous sodium carbonate of gram; 0.001N the sodium hydroxide of gram; 0.0085N the water retaining of gram; The mass ratio of carboxymethyl starch and Polyanionic Cellulose is 3:1 in this water retaining; 0.01N the tackifier of gram; The mass ratio of xanthan gum, hydroxypropyl guar and oxygen scavenger is 2:3:5 in these tackifier; 0.0035N the whipping agent of gram, the mass ratio of sodium laurylsulfonate, polyoxyethylene octyl phenol ether, OA-12 and dodecyl sulphate tri ethanol ammonium salt is 1:1:1:1 in this whipping agent; 0.005N the suds-stabilizing agent of gram, the mass ratio of trolamine, ethanol and lauryl alcohol is 1:1:2 in this suds-stabilizing agent; 0.05N the clay inhibitor of gram, this clay inhibitor is Repone K; 0.03N the temperature stabilising agent of gram, this temperature stabilising agent is the low-molecular(weight)polymer stablizer; 0.003N the sterilant of gram, this sterilant is glutaraldehyde.
Wherein the value of N is 400, then in the present embodiment, this drilling fluid comprises: water 400g, anhydrous sodium carbonate 0.40g, sodium hydroxide 0.40g, water retaining 3.20g(is comprised of with ratio of quality and the number of copies 5:1 carboxymethyl starch and Polyanionic Cellulose), tackifier 4.00g(is by xanthan gum, hydroxypropyl guar and oxygen scavenger Na2SO3 form with ratio of quality and the number of copies 4:1:5, wherein, the number-average molecular weight of yellow collagen is 2 * 107g/mol), whipping agent 1.20g(is by sodium laurylsulfonate, polyoxyethylene octyl phenol ether, four kinds of materials of OA-12 and dodecyl sulphate tri ethanol ammonium salt form with ratio of quality and the number of copies 3:1:1:1), suds-stabilizing agent 1.20g(is by trolamine, three kinds of materials of ethanol and lauryl alcohol form with ratio of quality and the number of copies 1:1:2), clay inhibitor KCl20.0g, temperature stabilising agent low-molecular(weight)polymer stablizer 12.0g, sterilant glutaraldehyde 1.2g.
According to the ratio of above-mentioned each treatment agent, under agitation condition, Xiang Shuizhong adds successively anhydrous sodium carbonate, sodium hydroxide, water retaining, tackifier, whipping agent, suds-stabilizing agent, clay inhibitor, temperature stabilising agent, sterilant and is mixed with drilling fluid No. 5.Wherein, the speed of stirring can be controlled at about 5000rpm.
Performance evaluation
Resulting drilling fluid in above-described embodiment one to embodiment five is carried out performance evaluation.
1, density measurement
With the drilling fluid liquidensitometer of suitable range, measure respectively the density of No. 1, No. 2, No. 3, No. 4 and No. 5 drilling fluid.
2, pH pH-value determination pH
Dip respectively the drop of No. 1, No. 2, No. 3, No. 4 and No. 5 drilling fluid with clean glass stick on the pH test paper, reference standard color range reading.
3, plastic viscosity, yield value and gel strength are measured
Get respectively the sample of identical milliliter number with obtaining No. 1, No. 2, No. 3, No. 4 with No. 5 drilling fluids, record respectively on the rotational viscosimeter 600 turn/per minute and 300 turns/stable reading under the per minute rotating speed, by formula (I), formula (II) respectively computational plasticity viscosity, yield value, ingress, egress.
PV＝θ
600-θ
300 （I)
In the formula: PV is plastic viscosity, and unit is mPas; YP is yield value, and unit is Pa; θ
600, θ
300Be 600 turn/per minute and 300 turns/stable reading under the per minute rotating speed, zero dimension.
4, the drilling fluid fluid loss is measured dehydration mensuration
Get respectively the sample of identical milliliter number with obtaining No. 1, No. 2, No. 3, No. 4 with No. 5 drilling fluids, measure at middle pressure filter press.The mensuration process is as follows:
4.1 the mud cup assembly is assembled at the mud that injects a certain amount of (240mL) in mud cup groove place to the cup.
4.2 the drilling fluid cup is inverted, and the gas transmission tip side purging valve of upwards packing into makes its half-twist.
4.3 the graduated cylinder of drying is placed on base position below the vent pipe, aims at mud cup drainage mouth and be used for receiving filtrate.
4.4 open source of the gas, clockwise direction is rotating pressure-decreasing valve module voltate regulator handle slowly, and pressure is transferred to 0.69MPa.
Start the stopwatch record leak-off time when beginning fluctuation or having airflow noise to enter mud cup 4.5 treat pointer.
4.6 measure filter loss take milliliter as unit record at the volume of 30min filtrate (being accurate to 0.1 milliliter) and as the drilling fluid fluid loss, record simultaneously the initial temperature ℃ (℉ of drilling fluid sample), keep filtrate as chemical analysis.
5, extreme boundary lubrication mensuration
Get respectively the sample of identical milliliter number with obtaining No. 1, No. 2, No. 3, No. 4 with No. 5 drilling fluids, measure at the extreme boundary lubrication instrument.The mensuration process is as follows:
5.1 the startup instrument makes its 15min that turns round under 300rpm, rear adjusting rotary speed is that the 60rpm(deviation ± 5rpm), until the stable rear powered-down of reading, adjusting torque spanner is zero.
5.2 slide block, slip ring are installed.
5.3 with topping-up in the sample cup, make the submergence of slide block slip ring wherein, start idle running 5min also checks tachometer gage and whether torsionmeter is in the state of mixing up.Regulating the torque spanner value is 16.95Ns(150Psi), adjusting rotary speed is 62rpm, and the rotating speed of this moment is rated rotational frequency, and regulating reading when laying down pressure idle running is zero.
5.4 under rated rotational frequency, regulating rapidly torque spanner, to make the dial plate value of torque spanner be 16.95Ns(150Psi), running 5min, the reading of this moment is 28～48, record reading (if not in this scope then from new correction).Be calculated as follows correction factor:
5.5 will fill with working fluid to be measured in the sample cup, make the submergence of slide block slip ring wherein, regulating the torque spanner value is 16.95Ns(150Psi), adjusting rotary speed is 62rpm, record reading at this moment.Be calculated as follows the coefficient of friction resistance:
6, leak stopping performance measurement
Static leaking stoppage experiment uses the Inst of Drilling-Well Technology, Huabei Petroleum Administration sealing Analog Device, selects 40～60 order sand to do the casting bed leaking stoppage experiment.Add to drive and press 5.5MPa, back pressure 0.5MPa, record wastage and plugging time.
Dynamically leaking stoppage experiment uses rock productivity simulation equipment, chooses rate of permeation less than 0.5～1.0 μ m
2The rock core leaking stoppage experiment is done in formation core or people's lithogenesis.Add to drive and press 5.5MPa, back pressure 0.5MPa, shearing rate 300s
-1, record wastage and plugging time.
7, the core permeability recovery value is measured
Press oil and gas industry standard SY/T6540-2002 " drilling fluid drilling fluid damage oil reservoir indoor evaluation method " and carry out, use under the understressed sand productivity simulation unit simulation drilling condition reservoir protection effect of drilling fluid is studied and estimated.
According to above-mentioned experimental procedure, it is as shown in table 1 to obtain No. 1 property of drilling fluid, and No. 2 property of drilling fluid is as shown in table 2, and No. 3 property of drilling fluid is as shown in table 3, and No. 4 property of drilling fluid is as shown in table 4, and No. 5 property of drilling fluid is as shown in table 5.
| Project | Requirement | Test value |
| Density, g/cm 3 | 0.90～1.00 | 0.91 |
| The pH value | 9～11 | 10 |
| Plastic viscosity, mPas | 10～30 | 16 |
| Yield value, Pa | 10～20 | 12 |
| The drilling fluid fluid loss is measured, mL | 1.0～7.0 | 4.3 |
| The extreme boundary lubrication coefficient | 0～0.2 | 0.062 |
| Static wastage, mL/30min | ≤10 | 1.2 |
| Dynamic wastage, mL/30min | ≤10 | 0 |
| The core permeability recovery value, % | ≥85 | 90.1 |
Table 1
| Project | Requirement | Test value |
| Density, g/cm 3 | 0.85～0.90 | 0.86 |
| The pH value | 9～11 | 10 |
| Plastic viscosity, mPas | 10～30 | 18 |
| Yield value, Pa | 10～20 | 13 |
| The drilling fluid fluid loss is measured, ml | 1.0～7.0 | 4.1 |
| The extreme boundary lubrication coefficient | 0～0.2 | 0.074 |
[0163]
| Static wastage, mL/30min | ≤10 | 0.8 |
| Dynamic wastage, mL/30min | ≤10 | 0 |
| The core permeability recovery value, % | ≥85 | 88.4 |
Table 2
| Project | Requirement | Test value |
| Density, g/cm 3 | 0.75～0.85 | 0.81 |
| The pH value | 9～11 | 10 |
| Plastic viscosity, mPas | 10～30 | 22 |
| Yield value, Pa | 10～20 | 17 |
| The drilling fluid fluid loss is measured, ml | 1.0～7.0 | 5.3 |
| The extreme boundary lubrication coefficient | 0～0.2 | 0.064 |
| Static wastage, mL/30min | ≤10 | 2.1 |
| Dynamic wastage, mL/30min | ≤10 | 0 |
| The core permeability recovery value, % | ≥85 | 85.7 |
Table 3
| Project | Requirement | Test value |
| Density, g/cm 3 | 0.85～0.90 | 0.88 |
| The pH value | 9～11 | 10 |
| Plastic viscosity, mPas | 10～30 | 26 |
| Yield value, Pa | 10～20 | 19 |
| The drilling fluid fluid loss is measured, ml | 1.0～7.0 | 4.1 |
| The extreme boundary lubrication coefficient | 0～0.2 | 0.074 |
| Static wastage, mL/30min | ≤10 | 0.8 |
| Dynamic wastage, mL/30min | ≤10 | 0 |
| The core permeability recovery value, % | ≥85 | 88.0 |
Table 4
| Project | Requirement | Test value |
| Density, g/cm 3 | 0.85～0.90 | 0.85 |
| The pH value | 9～11 | 10 |
[0170]
| Plastic viscosity, mPas | 10～30 | 25 |
| Yield value, Pa | 10～20 | 16 |
| The drilling fluid fluid loss is measured, ml | 1.0～7.0 | 4.1 |
| The extreme boundary lubrication coefficient | 0～0.2 | 0.074 |
| Static wastage, mL/30min | ≤10 | 0.8 |
| Dynamic wastage, mL/30min | ≤10 | 0 |
| The core permeability recovery value, % | ≥85 | 88.0 |
Table 5
Can find out that from above experimental result the property indices of drilling fluid of the present invention all reaches design requirements.Drilling fluid of the present invention, for the performance table of 1 ~ No. 3 drilling fluid as can be known, its density is adjustable, can adjust pH value 9～11 in 0.75 ~ 1.00g/cm3 scope, plastic viscosity 10～30mPas, yield value 10～30Pa, the drilling fluid fluid loss is measured 1.0 ~ 7.0mL, extreme boundary lubrication coefficient 0 ~ 0.2, static wastage≤10mL/30min, dynamically wastage≤10mL/30min.For No. 1, No. 4 and No. 5 drilling fluids, by changing water retaining, tackifier, whipping agent, the suds-stabilizing agent equal size in this drilling fluid, so that the density of drilling fluid can be regulated automatically, for example can in 0.75 ~ 1.00g/cm3 scope, adjust; And the span that guarantees the pH value is 9～11, the span of plastic viscosity is 10～30mPas, the span of yield value is 10～30Pa, the span that the drilling fluid fluid loss is measured is 1.0 ~ 7.0mL, the span of extreme boundary lubrication coefficient is 0 ~ 0.2, the span of static wastage is≤10mL/30min that dynamically the span of wastage is≤10mL/30min.The standard that meets the drilling fluid under multiple leakage environment has good leak-proof leak-stopping effect, and prescription can be regulated and control, the stable performance of drilling fluid, and execute-in-place is easy, only needs to add corresponding component and gets final product, and does not need other equipment.
In sum, drilling fluid provided by the invention is mainly as the leak-proof leak-stopping of leakage stratum when creeping into, and it has leak-off, the lubricated effect of falling simultaneously concurrently; Drilling fluid provided by the invention has overcome the shortcoming that the nitrogen foam configuration device is numerous and jumbled, foam density is controlled difficulty, dosing apparatus is simple and easy, and density is adjusted easy advantage, and except the characteristics that possess foam class drilling fluid, also increase the advantage of leak-proof leak-stopping newly, and have more the adjustable characteristics of density.Drilling fluid provided by the invention has solved the problem that leakage easily occurs in the low pressure and easy leaking strata drilling process, but the bearing capacity on Effective Raise stratum.
The above is preferred embodiment of the present invention only, is not for limiting protection scope of the present invention.All any modifications of doing within the spirit and principles in the present invention, be equal to replacement, improvement etc., all be included in protection scope of the present invention.
Claims (10)
1. drilling fluid, the consisting of of described drilling fluid:
The water of N gram, N is positive number;
0.001N the anhydrous sodium carbonate of gram;
0.001N the sodium hydroxide of gram;
0.005N the water retaining of gram-0.01N gram;
0.005N the tackifier of gram-0.01N gram;
0.001N the whipping agent of gram-0.004N gram;
0.001N the suds-stabilizing agent of gram-0.004N gram.
2. drilling fluid according to claim 1 is characterized in that, the composition of described drilling fluid also comprise following one or more:
0.03N the clay inhibitor of gram-0.05N gram;
0.01N the temperature stabilising agent of gram-0.03N gram;
0.001N the sterilant of gram-0.003N gram.
3. drilling fluid according to claim 2 is characterized in that,
Described water retaining comprise following one or more: carboxymethyl starch, Polyanionic Cellulose;
And/or,
Described tackifier comprise following one or more: the multipolymer of xanthan gum, hydroxypropyl guar, acrylate; Perhaps, described tackifier comprise oxygen scavenger and following one or more: the multipolymer of xanthan gum, hydroxypropyl guar, acrylate;
And/or,
Described whipping agent comprises with one or more: sodium laurylsulfonate, polyoxyethylene octyl phenol ether, OA-12, dodecyl sulphate tri ethanol ammonium salt;
And/or,
Described suds-stabilizing agent comprise following one or more: trolamine, ethanol, lauryl alcohol;
And/or,
Described clay inhibitor comprise following one or both: Repone K, small cation;
And/or,
Described temperature stabilising agent comprise following one or more: low-molecular(weight)polymer stablizer, sulfonated phenol formaldehyde resin and modifier thereof, chromate, sulfonated lignite modifier, organic sulfonated polymer class;
And/or,
Described sterilant comprise following one or more: glutaraldehyde, acetic acid, Peracetic Acid, lactic acid, propionic acid.
4. drilling fluid according to claim 3 is characterized in that,
Described water retaining comprises: carboxymethyl starch and Polyanionic Cellulose; Wherein, the mass ratio of carboxymethyl starch and Polyanionic Cellulose is a:1; The span of a is 3 ~ 5;
And/or,
Described tackifier comprise: xanthan gum, hydroxypropyl guar and oxygen scavenger; Wherein, the mass ratio of xanthan gum, hydroxypropyl guar and oxygen scavenger is b:c:5; The span of b is that the span of 2 ~ 4, c is 3 ~ 1;
And/or,
Described whipping agent comprises: sodium laurylsulfonate, polyoxyethylene octyl phenol ether, OA-12 and dodecyl sulphate tri ethanol ammonium salt; Wherein, the mass ratio of sodium laurylsulfonate, polyoxyethylene octyl phenol ether, OA-12 and dodecyl sulphate tri ethanol ammonium salt is d:1:1:1; The span of d is 1 ~ 3;
And/or,
Described suds-stabilizing agent comprises: trolamine, ethanol and lauryl alcohol; Wherein, the mass ratio of trolamine, ethanol and lauryl alcohol is 1:1:e; The span of e is 1 ~ 2.
5. drilling fluid according to claim 4 is characterized in that, consisting of in this drilling fluid:
The water of N gram, N is positive number;
0.001N the anhydrous sodium carbonate of gram;
0.001N the sodium hydroxide of gram;
0.005N the water retaining of gram; The mass ratio of carboxymethyl starch and Polyanionic Cellulose is 3:1 in this water retaining;
0.005N the tackifier of gram; The mass ratio of xanthan gum, hydroxypropyl guar and oxygen scavenger is 2:3:5 in these tackifier;
0.001N the whipping agent of gram, the mass ratio of sodium laurylsulfonate, polyoxyethylene octyl phenol ether, OA-12 and dodecyl sulphate tri ethanol ammonium salt is 1:1:1:1 in this whipping agent;
0.001N the suds-stabilizing agent of gram, the mass ratio of trolamine, ethanol and lauryl alcohol is 1:1:1 in this suds-stabilizing agent;
0.03N the clay inhibitor of gram, this clay inhibitor is Repone K;
0.01N the temperature stabilising agent of gram, this temperature stabilising agent is the low-molecular(weight)polymer stablizer;
0.001N the sterilant of gram, this sterilant is glutaraldehyde.
6. drilling fluid according to claim 4 is characterized in that, consisting of in this drilling fluid:
The water of N gram, N is positive number;
0.001N the anhydrous sodium carbonate of gram;
0.001N the sodium hydroxide of gram;
0.006N the water retaining of gram; The mass ratio of carboxymethyl starch and Polyanionic Cellulose is 4:1 in this water retaining;
0.008N the tackifier of gram; The mass ratio of xanthan gum, hydroxypropyl guar and oxygen scavenger is 3:2:5 in these tackifier;
0.002N the whipping agent of gram, the mass ratio of sodium laurylsulfonate, polyoxyethylene octyl phenol ether, OA-12 and dodecyl sulphate tri ethanol ammonium salt is 2:1:1:1 in this whipping agent;
0.002N the suds-stabilizing agent of gram, the mass ratio of trolamine, ethanol and lauryl alcohol is 1:1:2 in this suds-stabilizing agent;
0.04N the clay inhibitor of gram, this clay inhibitor is Repone K;
0.02N the temperature stabilising agent of gram, this temperature stabilising agent is the low-molecular(weight)polymer stablizer;
0.002N the sterilant of gram, this sterilant is glutaraldehyde.
7. drilling fluid according to claim 4 is characterized in that, consisting of in this drilling fluid:
The water of N gram, N is positive number;
0.001N the anhydrous sodium carbonate of gram;
0.001N the sodium hydroxide of gram;
0.008N the water retaining of gram; The mass ratio of carboxymethyl starch and Polyanionic Cellulose is 5:1 in this water retaining;
0.01N the tackifier of gram; The mass ratio of xanthan gum, hydroxypropyl guar and oxygen scavenger is 4:1:5 in these tackifier;
0.003N the whipping agent of gram, the mass ratio of sodium laurylsulfonate, polyoxyethylene octyl phenol ether, OA-12 and dodecyl sulphate tri ethanol ammonium salt is 3:1:1:1 in this whipping agent;
0.003N the suds-stabilizing agent of gram, the mass ratio of trolamine, ethanol and lauryl alcohol is 1:1:2 in this suds-stabilizing agent;
0.05N the clay inhibitor of gram, this clay inhibitor is Repone K;
0.03N the temperature stabilising agent of gram, this temperature stabilising agent is the low-molecular(weight)polymer stablizer;
0.003N the sterilant of gram, this sterilant is glutaraldehyde.
8. drilling fluid according to claim 1 is characterized in that,
The moisture content of described water retaining≤5%;
And/or,
The moisture content of described tackifier≤15%;
And/or,
The base fluid froth quality of described whipping agent 〉=20%;
And/or,
The volume compressibility of described suds-stabilizing agent 〉=15%.
9. drilling fluid preparation method is characterized in that the method comprises:
The anhydrous sodium carbonate that adds successively the 0.001N gram, the sodium hydroxide of 0.001N gram, the water retaining of 0.005N gram-0.01N gram, the tackifier of 0.005N gram-0.01N gram, the whipping agent of 0.001N gram-0.004N gram, the suds-stabilizing agent of 0.001N gram-0.004N gram are stirred in the limit in N gram water.
10. method according to claim 9 is characterized in that, the method also comprises:
In described drilling fluid, add while stirring in the following component one or more:
0.03N the clay inhibitor of gram-0.05N gram; 0.01N the temperature stabilising agent of gram-0.03N gram; 0.001N the sterilant of gram-0.003N gram.
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