CN103045190B - Soluble weighting salt low-damage drilling fluid and preparation method thereof - Google Patents
Soluble weighting salt low-damage drilling fluid and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a soluble weighting salt low-damage drilling fluid and a preparation method thereof. The soluble weighting salt low-damage drilling fluid comprises the following components in percentage by mass: 10-20% of organic salt, 3-5% of inorganic salt, 0.1-0.3% of viscosifier, 0.5-1.0% of fluid loss agent, 0.5-5.0% of temporary shielding agent, 0.1-0.3% of alkalinity control agent, 0.03-0.1% of preservative, 0.5-0.8% of deoxidant, 0.1-0.2% of corrosion inhibitor and the balance of water. The soluble weighting salt low-damage drilling fluid disclosed by the invention has stable performance and high liquid phase density, is easy to regulate, realizes good rheological property, can effectively protect the storage layer, maintain stability of the well wall and improve the drilling encounter ratio of the storage layer, and is particularly suitable for a horizontal-section storage layer of mudstone.
Description
Technical field
The present invention relates to the drilling fluid in a kind of oilfield drilling operation, the solubility that particularly a kind of applicable gas storage horizontal section creeps into adds geavy salt Low Damage drilling fluid and preparation method thereof.
Background technology
Construction of storage is the Important Action of national energy security, mainly solves the peaking problem of natural gas motorcar.In prior art, large-scale self-contained deep low-permeability porous sandstone lithology dry gas reservoir, gas field area is large and reservoir is thin: reservoir thickness 5-45 rice (average 15 meters), low permeability (average 0.7mD), low porosity (5%).Gas-bearing formation buried depth is at about 2800m; after long-term exploitation; zone of interest pressure extremely low (pressure factor 0.4-0.6); horizontal well and sieve tube completion mode is adopted to carry out; make wellbore construction there is many technical barriers, the distinctive sand body of gas field reservoir in flakes property is poor, and particularly boring chance mud stone at horizontal section may cause wellbore instability; simultaneously to the protection of the original degree of reservoir pore throat passage, reservoir is namely protected to propose higher requirement.
Horizontal well drilling technology is widely applied in worldwide, and the drilling fluid property related to is also more.But in actual applications, drilling fluid becomes one of Main Bottleneck of long horizontal well drilling technology application, bore when particularly long horizontal sections brill is met and meet mud stone, carbonaceous mudstone and coal seam.First there is very large mechanics unstable, and containing the extremely strong mud shale of the swelling property of minute quantity or other clay material in the microfracture of coal seam, after mud filtrate invades, destroy the original mechanical structure in coal seam further, the possibility collapsed is larger, the appearance of especially large section mud stone, carbonaceous mudstone, stability is poorer, and this well section is also in long horizontal sections and open hole completion simultaneously, exposes segment length, itself belong to " three is low " reservoir, thus the injury probability of drilling fluid to reservoir is larger.Conventional drilling liquid can not meet the technical requirements such as wellbore stability, protection reservoir, hole cleaning, reduction frictional resistance, often causes down-hole complexity and reservoir damage.
China Patent No. " 200810232642.9 " discloses a kind of di-kalium ion-polymer drilling fluid with strong rejection capability, and publication date is on December 15th, 2008, comprises the material of following weight per-cent: A. is as the inorganic potassium salt 7%-9% of inorganic inhibitor; B. as the potassium salt 0.5%-0.6% of organic inhibitor; C. stick 0.3%-0.5% is carried; D. fluid loss agent 0.3%-0.5%; E. alkalinity control agent 0.3%-0.5%; F. sanitas 0.03%-0.1%; G. defoamer 0.1%-0.2%; H. weighting agent 1%-8%; Surplus is water.But this patented technology is applied in horizontal well Reservoir Section drilling technique, there are the following problems in meeting: the drilling fluid one, described in this patent is applied to top well section, to collapse problem for top well section, because stratum there are differences, this drilling fluid can not solve horizontal section wellbore stability and reservoir damage problem; Two, the potassium salt described in this patent and weighting agent can damage initial reservoir rate of permeation, cause oil and gas production to reduce, and are therefore not suitable for horizontal well Reservoir Section; Three, drilling fluid described in this patent is that solid phase increases the weight of, and the easy invaded formation of too much solid phase, causes reservoir damage, and simultaneously too much solid phase may cause horizontal section moment of torsion to increase, and property of drilling fluid such as not easily to regulate at the problem; Four, this patent drilling fluid mainly prevents the top hard fragile shale of well section from caving in, and can not solve bottom Reservoir Section soft mudstone and carbonaceous mudstone and to cave in problem.Five, because horizontal section well depth strengthens, formation temperature raises, and in drilling fluid described in this patent, polymkeric substance temperature resistance is lower, can not meet formation temperature higher when long horizontal sections creeps into.
Summary of the invention
The object of the invention is to the problems referred to above overcoming the drilling fluid existence used in existing long horizontal well drilling technology; a kind of solubility is provided to add geavy salt Low Damage drilling fluid and preparation method thereof; stable performance of the present invention; density of liquid phase is high, and easily regulates, good rheological property; energy available protecting reservoir; keep wellbore stability, improve reservoir Drilling ratio, be specially adapted to the horizontal section reservoir of mud stone.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of solubility adds geavy salt Low Damage drilling fluid, it is characterized in that, comprises the component of following mass percent:
Organic salt 10 ~ 20%; Inorganic salt 3 ~ 5%; Carry stick 0.1 ~ 0.3%; Fluid loss agent 0.5 ~ 1.0%; Shielding diverting agent 0.5 ~ 5.0%; Alkalinity control agent 0.1 ~ 0.3%; Sanitas 0.03 ~ 0.1%; Oxygen scavenger 0.5 ~ 0.8%; Inhibiter 0.1 ~ 0.2%; Surplus is water.
The present invention also comprises lubricant 1.0 ~ 2.0%, and described lubricant is oil lubricant.
Described organic salt is a kind of in potassium formiate, sodium formiate or potassium acetate or by any proportioning two kinds.
Described inorganic salt are a kind of in Repone K, potassium sulfate, saltpetre or sodium-chlor or by any proportioning two kinds.
Described stick of carrying is a kind of in xanthan gum or high adhesive aggregation anionic cellulose or by any proportioning two kinds.
Described fluid loss agent is two kinds of a kind of or any proportioning in low adhesive aggregation anionic cellulose, low sticky carboxylic sodium base base Mierocrystalline cellulose, Natvosol or starch.
Described shielding diverting agent is a kind of of soluble cellulose or detailed catalogue calcium carbonate or by any proportioning two kinds.
Described alkalinity control agent is sodium hydroxide, potassium hydroxide or Strong oxdiative calcium.
Described sanitas is formaldehyde or glutaraldehyde.
Described oxygen scavenger is organic amine compound.
Described inhibiter is organophosphorus heterogeneous ring compound.
A kind of solubility adds geavy salt Low Damage drilling fluid and preparation method thereof, it is characterized in that, comprises the steps:
A, according to proportioning, in clear water, add fluid loss agent and carry stick respectively, and be uniformly mixed;
B, add organic salt and inorganic salt again, stir and make it fully dissolve;
C, add shielding diverting agent again, be uniformly mixed;
D, add sanitas, oxygen scavenger and inhibiter respectively again, stir and make it dissolve;
E, with alkalinity control agent, pH value is adjusted to 9 ~ 10.5;
F, in use, add lubricant as required.
Employing the invention has the advantages that:
One, the present invention is with at least one organic salt, at least one inorganic salt, few a kind of polymer viscosifier; at least one polymer filtrate reducer is that main additive is mixed with drilling fluid; this drilling fluid is without clay; rheological property is easy to regulate, and is weighting agent, makes drilling fluid reach certain density of liquid phase with soluble salt; there is the features such as high-density, low solid phase, high inhibition; reach protection reservoir, prevent slump in, the requirement of hole cleaning.
Two, the present invention utilizes soluble salt regulating density of drilling liquid, and ply stress evenly eliminates useless solid phase to greatest extent; Comprise organic salt 10 ~ 20%; Inorganic salt 3 ~ 5%, utilize organic salt and inorganic salt synergistic effect to suppress hydration of mud stone to expand, collapse; Comprise agent fluid loss agent 0.5 ~ 1.0%, select, develop suitable process, meet the requirement of on-the-spot drilling fluid rheology performance; Comprise shielding diverting agent 0.5 ~ 5.0%, be beneficial to protection reservoir, easy de-plugging, utilize shielding diverting agent shutoff cracks in coal seam, improve drilling fluid shut-off capacity and excellent building capacity.
Three, stable performance of the present invention, density of liquid phase is high, and easily regulates; good rheological property; energy available protecting reservoir, keeps wellbore stability, improves reservoir Drilling ratio; particularly for the horizontal section reservoir containing mud stone; especially be applicable to having potential injury horizontal section reservoir, the needs that gas storage long horizontal sections creeps into can be met, significantly can improve per-well production again; obtain good economic benefit and social benefit, be worthy of popularization very much.
Four, the present invention is compared with Chinese patent " 200810232642.9 ", the advantage had is: 1, utilize soluble salt weighted drilling fluid, effectively can reduce solid phase and cause the problems such as reservoir damage, moment of torsion increase, property of drilling fluid not easily regulates, can reduce the corrodibility of system, and Master Cost is low.2, the solvability of soluble salt in water is higher, Auto-regulating System of Density of Heavy Medium wide ranges, hydrolysis when can reduce most of viscosity increaser and fluid loss agent high temperature and rates of oxidative degradation; Soluble salt activity is low, to property of drilling fluid and formation influence little, be conducive to wellbore stability.3, the present invention is compared with Chinese patent " 200810232642.9 ", eliminates solid phase weighting agent, improves inorganic salt and organic salt proportion, adds shielding diverting agent.
Embodiment
Embodiment 1
A kind of solubility adds geavy salt Low Damage drilling fluid, comprises the component of following mass percent:
Organic salt 10%; Inorganic salt 3%; Carry stick 0.1%; Fluid loss agent 0.5%; Shielding diverting agent 0.5%; Alkalinity control agent 0.1%; Sanitas 0.03%; Oxygen scavenger 0.5%; Inhibiter 0.1%; Surplus is water.
The present invention also comprises lubricant 1.0%, and further, described lubricant is oil lubricant, can be specifically DFL-1 or JN-303 any one, adopt existing commercially available oil lubricant.
In the present invention, described organic salt is any one in potassium formiate, sodium formiate or potassium acetate, but is not limited to these organic salt, and other organic salt of the prior art is also applicable.
In the present invention, described inorganic salt are any one in Repone K, potassium sulfate, saltpetre or sodium-chlor, but are not limited to these inorganic salt, and other inorganic salt of the prior art are also applicable.
In the present invention, described in carry stick be xanthan gum or high adhesive aggregation anionic cellulose (PAC-HV), xanthan gum or high adhesive aggregation anionic cellulose (PAC-HV) select existing commercially available prod.
In the present invention, described fluid loss agent is any one in low adhesive aggregation anionic cellulose (PAC-LV), low sticky carboxylic sodium base base Mierocrystalline cellulose (CMC-LV), Natvosol (HEC) or starch, is commercially available prod, is this commercial disignation in bracket.
In the present invention, described shielding diverting agent is Walocel MT 20.000PV bead or the 800-1500 object detailed catalogue calcium carbonate of particle diameter 1-20 micron, is commercially available prod, also can selects other shielding diverting agent of the prior art.
In the present invention, described alkalinity control agent is sodium hydroxide, potassium hydroxide or Strong oxdiative calcium, but is not limited to these, and in prior art, character is identical.
In the present invention, described sanitas is formaldehyde or glutaraldehyde, but is not limited to these, and in prior art, character is identical.
In the present invention, described oxygen scavenger is organic amine compound, and can be specifically that FDO-I or WL108 is wherein a kind of, organic amine compound commercially available in prior art all can be selected.
In the present invention, described inhibiter is organophosphorus heterogeneous ring compound, and can be specifically that ZHF-II or MIG is wherein a kind of, organophosphorus heterogeneous ring compound commercially available in prior art all can be selected.
A kind of solubility adds geavy salt Low Damage drilling fluid and preparation method thereof, comprises the steps:
A, according to proportioning, in clear water, add fluid loss agent and carry stick respectively, and be uniformly mixed;
B, add organic salt and inorganic salt again, stir and make it fully dissolve;
C, add shielding diverting agent again, be uniformly mixed;
D, add sanitas, oxygen scavenger and inhibiter respectively again, stir and make it dissolve;
E, with alkalinity control agent, pH value is adjusted to 9;
F, in use, add lubricant as required.
Embodiment 2
The present embodiment and above-described embodiment are substantially identical, and the key distinction is:
A kind of solubility adds geavy salt Low Damage drilling fluid, comprises the component of following mass percent:
Organic salt 20%; Inorganic salt 5%; Carry stick 0.3%; Fluid loss agent 1.0%; Shielding diverting agent 5.0%; Alkalinity control agent 0.3%; Sanitas 0.1%; Oxygen scavenger 0.8%; Inhibiter 0.2%; Lubricant 2.0%; Surplus is water.
In the present invention, described organic salt is at least two kinds by any proportioning in potassium formiate, sodium formiate or potassium acetate.
In the present invention, described inorganic salt are Repone K, potassium sulfate, saltpetre or sodium-chlor by least two kinds of any proportioning.
In the present invention, described in carry stick be in xanthan gum or high adhesive aggregation anionic cellulose two kinds by any proportioning.
In the present invention, described fluid loss agent is low adhesive aggregation anionic cellulose, low sticky carboxylic sodium base base Mierocrystalline cellulose, Natvosol or starch by least two kinds of any proportioning.
In the present invention, described shielding diverting agent is that soluble cellulose or detailed catalogue calcium carbonate are by any proportioning.
A kind of solubility adds geavy salt Low Damage drilling fluid and preparation method thereof, it is characterized in that, comprises the steps:
A, according to proportioning, in clear water, add fluid loss agent and carry stick respectively, and be uniformly mixed;
B, add organic salt and inorganic salt again, stir and make it fully dissolve;
C, add shielding diverting agent again, be uniformly mixed;
D, add sanitas, oxygen scavenger and inhibiter respectively again, stir and make it dissolve;
E, with alkalinity control agent, pH value is adjusted to 10.5.
Embodiment 3
The present embodiment is substantially identical with above embodiment, and the key distinction is:
A kind of solubility adds geavy salt Low Damage drilling fluid, comprises the component of following mass percent:
Organic salt 15%; Inorganic salt 4%; Carry stick 0.2%; Fluid loss agent 0.8%; Shielding diverting agent 3%; Alkalinity control agent 0.2%; Sanitas 0.5%; Oxygen scavenger 0.7%; Inhibiter 0.15%; Lubricant 1.5%; Surplus is water.
A kind of solubility adds geavy salt Low Damage drilling fluid and preparation method thereof, comprises the steps:
A, according to proportioning, in clear water, add fluid loss agent and carry stick respectively, and be uniformly mixed;
B, add organic salt and inorganic salt again, stir and make it fully dissolve;
C, add shielding diverting agent again, be uniformly mixed;
D, add sanitas, oxygen scavenger and inhibiter respectively again, stir and make it dissolve;
E, with alkalinity control agent, pH value is adjusted to 9.5.
Embodiment 4
A kind of solubility adds geavy salt Low Damage drilling fluid, prepares the raw materials used material comprising following mass percent of this drilling fluid: as the organic salt 17% of liquid phase weighting agent and inhibitor; As the inorganic machine salt 4.5% of liquid phase weighting agent and inhibitor; Carry stick 0.15%; Fluid loss agent 1.0%; Shielding diverting agent 4.5%; Alkalinity control agent 0.13%; Sanitas 0.08%; Lubricant 1.7%; Oxygen scavenger 0.7%; Inhibiter 0.17%; Surplus is water.
Its preparation method is carried out according to following program at normal temperatures and pressures by the compound of aforementioned proportion:
1) clear water of said ratio is loaded at the scene in slurry commanding tank;
2) add one or two kinds of fluid loss agents of said ratio, a kind of or two kinds carry stick and add in clear water, be fully uniformly mixed;
3) add organic salt and the inorganic salt of aforementioned proportion again, stir and make it fully dissolve;
4) add one or more shielding diverting agents of said ratio again, stir and fully mix;
5) add a kind of sanitas of aforementioned proportion more respectively, a kind of oxygen scavenger and a kind of inhibiter, stir and make it dissolve;
6) with the alkalinity regulator of said ratio, pH value is adjusted to 9 ~ 10.5;
7) a kind of lubricant of said ratio in actual use, is added according to actual needs.
Embodiment 5
The main payzone of East Ordos basin Yulin Gas Field is 2 sections, mountain, during this payzone section major sedimentary has-coarse quartz grain sandstone, landwaste quartzose sandstone, granule rock, mud stone and coal seam, gas reservoir buried depth 2800 ~ 3000m.The horizontal segment length of gas storage gas well is designed to 1500-2000m, belongs to long horizontal sections, lubrication drag reduction and hole cleaning outstanding problem; Low pressure stratum easily causes lateral segment construction to be missed, and affects wellbore construction and reservoir protection effect; , there are carbonaceous mudstone, mud stone handing-over alternating layers in block reservoir sand body poor continuity, very easily broken after stress, causes caliper expansion, form local " pregnant ", " sugarcoated haws on a stick " well, cause remove drill-through draw be hampered, even bit freezing occur.
By 0.5% low adhesive aggregation anionic cellulose, 1% starch, 0.1% xanthan gum, 0.3% high adhesive aggregation anionic cellulose, adds in clear water, is fully uniformly mixed, add the sodium formiate of 10% again, add 3% Repone K, stir and fully dissolve, add 3% soluble cellulose successively again, sanitas, oxygen scavenger and inhibiter, finally use sodium hydroxide adjust ph to desirable value, stir, abundant prehydration, is mixed with drilling fluid.
One, test performance experiment
Recommend the inspection of drilling fluid testing standard according to API, fundamental property is as shown in table 1,
Table 1 proportioning drilling fluid fundamental property
| Sequence number | Performance title | Index |
| 1 | Density, g/cm 3 | 1.05～1.15 |
| 2 | FV，sec. | 60～85 |
| 3 | API FL，mL | 3.5～5.0 |
| 4 | pH | 9～10 |
| 5 | PV，mPa·s | 8～13 |
| 6 | YP，Pa | 12～28 |
| 7 | 6RPM | 14～18 |
| 8 | Gel strength, Pa | 13～18/17～25 |
| 9 | Oil-contg, % | 1.0～2.0 |
| 10 | Solid load, % | 4～5 |
| 11 | The landwaste rate of recovery, % | 83～90 |
| 12 | Core damage recovery rate, % | 85～89 |
Two, according to above-mentioned composition and ratio, prepare at the scene according to preparation procedure, carried out the test in place of 1 mouthful of well, obtain following effect at Y37-1H:
Y37-1H well horizontal section is φ 152.4mm well, design length 1500mm, comes into effect horizontal section construction on March 29th, 2011, due to stratigraphic fluctuation, entered Taiyuan Forma-tion limestone 134m finishing drilling on May 23, last 56 days, finishing drilling well depth 4426.1m, horizontal segment length 1062.1m, clean sandstone segment length 466m, mud stone, Sandy Silt segment length 462m, lower φ 114.3mm sieve tube completion, gas testing open-flow capacity 20 × 10
4m
3/ d.
Wherein drilling fluid is low to reservoir damage, and draw according to doing indoor damage evaluation experimental data to on-the-spot mud, injury recovery rate can reach 88%.When creeping into, down-hole is normal, does not have to occur more complicated down-hole accident, effectively ensure that and creeps into smoothly.When lubricant adds to 1.5-2%, drilling fluid lubricating is good, and the coefficient of friction resistance is low, and Kf can be down to 0.03 from 0.05, turns round to refuse 13KN.m and be down to 10KN.m, drags pressure obviously to alleviate.Entering mud stone section stops after brill puies forward density, adds anti-sloughing agent in time, and down-hole is normal, does not occur well slough, contracts through waiting challenge.1.15-1.17g/cm3 density energy safety drilling mud stone section, this uses so low density or first well in this district.Make a trip without any phenomenon that is hampered, once on earth, 1062 rice huller screen pipes are once down to design attitude in electrical measurement.
(End) well liquid is bored to S211 Jing Shan in table 1 scene
2core damage experiment result
Note: K
g1for injuring front core gas permeability; K
g2for the core gas permeability after injury; Experiment condition: 91 DEG C, 29-34MPa.
Embodiment 6
By 0.5% low adhesive aggregation anionic cellulose, 0.5% starch, 0.3% xanthan gum, 0.2% high adhesive aggregation anionic cellulose, adds in clear water, is fully uniformly mixed, add the sodium formiate of 20%, the Repone K of 5%, the sodium-chlor of 3% again, stir and fully dissolve, then add the detailed catalogue calcium carbonate of 5%, stir, then add required temporary plugging agent successively, sanitas, oxygen scavenger and inhibiter, finally use sodium hydroxide adjust ph to desirable value, stir, abundant prehydration, is mixed with drilling fluid.
One, test performance experiment
Recommend the inspection of drilling fluid testing standard according to API, fundamental property is as shown in table 2,
Table 2 proportioning drilling fluid fundamental property
| Sequence number | Performance title | Index |
| 1 | Density, g/cm 3 | 1.17～1.25 |
| 2 | FV，sec. | 70～100 |
| 3 | API FL，mL | 3.0～4.0 |
| 4 | pH | 9～10 |
| 5 | PV，mPa·s | 10～15 |
| 6 | YP，Pa | 12～30 |
| 7 | 6RPM | 17～22 |
| 8 | Gel strength, Pa | 15～17/17～28 |
| 9 | Oil-contg, % | 1.0～2.0 |
| 10 | Solid load, % | 4～6 |
| 10 | The landwaste rate of recovery | 88～95% |
| 11 | Core damage recovery rate, % | 83～86 |
Two, according to above-mentioned composition and ratio, prepare at the scene according to above-mentioned preparation procedure, carried out the test in place of 1 mouthful of well, obtain following effect at Y37-2H well:
Y37-2H well horizontal section is φ 215.6mm well, design length 2000m, start horizontal section on April 30th, 2011 to creep into, wherein exist to bore in construction and meet mud stone, dense formation, sand content is high, and drag and torque is large, the problems such as underground fallen gear wheel, but by taking reasonable measure, well solve Problems existing in horizontal section construction process.Within 2011, in finishing drilling on July 18,78 days engineering times, finishing drilling well depth 5044m, horizontal segment length 1819m, such horizontal well construction record of the long celebrating of wound, rear lower φ 139.7mm sleeve pipe (screen casing) completion, test manufacture open-flow capacity reaches 100 × 10
4m
3/ d.
Table 3 elm 37-2H well horizontal section bores meets mudstone stratum
| Sequence number | Formation characteristics | Lateral segment (rice) | Thickness (rice) |
| 1 | Mud stone | 3920-3938 | 18 |
| 2 | Mud stone | 4028-4031 | 3 |
| 3 | Mud stone, hard mud stone | 4036-4075 | 39 |
| 4 | Mud stone | 4656-4670 | 14 |
| 5 | Mud stone, carbonaceous mudstone | 4973-5033 | 60 |
| Add up to | 134 |
Claims (7)
1. solubility adds a geavy salt Low Damage drilling fluid, it is characterized in that, comprises the component of following mass percent:
Organic salt 10 ~ 20%; Inorganic salt 3 ~ 5%; Carry stick 0.1 ~ 0.3%; Fluid loss agent 0.5 ~ 1.0%; Shielding diverting agent 0.5 ~ 5.0%; Alkalinity control agent 0.1 ~ 0.3%; Sanitas 0.03 ~ 0.1%; Oxygen scavenger 0.5 ~ 0.8%; Inhibiter 0.1 ~ 0.2%; Surplus is water;
Described organic salt is a kind of in potassium formiate, sodium formiate or potassium acetate or by any proportioning two kinds; Described inorganic salt are a kind of in Repone K, potassium sulfate, saltpetre or sodium-chlor or by any proportioning two kinds; Described alkalinity control agent is sodium hydroxide, potassium hydroxide or Strong oxdiative calcium; Described oxygen scavenger is FDO-I or WL108.
2. solubility according to claim 1 adds geavy salt Low Damage drilling fluid, it is characterized in that: also comprise lubricant 1.0 ~ 2.0%, and described lubricant is oil lubricant.
3. solubility according to claim 1 adds geavy salt Low Damage drilling fluid, it is characterized in that: described in carry stick be a kind of in xanthan gum or high adhesive aggregation anionic cellulose or by any proportioning two kinds.
4. solubility according to claim 1 adds geavy salt Low Damage drilling fluid, it is characterized in that: described fluid loss agent is two kinds of a kind of or any proportioning in low adhesive aggregation anionic cellulose, low sticky carboxylic sodium base base Mierocrystalline cellulose, Natvosol or starch.
5. solubility according to claim 1 adds geavy salt Low Damage drilling fluid, it is characterized in that: described shielding diverting agent is a kind of of soluble cellulose or detailed catalogue calcium carbonate or by any proportioning two kinds.
6. solubility according to claim 1 adds geavy salt Low Damage drilling fluid, it is characterized in that: described sanitas is formaldehyde or glutaraldehyde, and described oxygen scavenger is organic amine compound, and described inhibiter is organophosphorus heterogeneous ring compound.
7. a kind of solubility according to claim 1 adds geavy salt Low Damage drilling fluid and preparation method thereof, it is characterized in that, comprises the steps:
A, according to proportioning, in clear water, add fluid loss agent and carry stick respectively, and be uniformly mixed;
B, add organic salt and inorganic salt again, stir and make it fully dissolve;
C, add shielding diverting agent again, be uniformly mixed;
D, add sanitas, oxygen scavenger and inhibiter respectively again, stir and make it dissolve;
E, with alkalinity control agent, pH value is adjusted to 9 ~ 10.5;
F, in use, add lubricant as required.
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| CN106221684A (en) * | 2016-07-28 | 2016-12-14 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | Closure drilling fluid and the preparation method by force that a kind of carbonaceous mudstone is anti-collapse |
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