CN103194186B - High density ultramicro formation testing working solution and preparation method thereof - Google Patents
High density ultramicro formation testing working solution and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a high density ultramicro formation testing working solution and a preparation method thereof. The high density ultramicro formation testing working solution comprises the following raw material components in parts by weight: 100-500 parts of water, 0.1-10 parts of high temperature resistance dispersing agent, 0.1-10 parts of high temperature resistance dispersion stabilizer, 0.6-2.0 parts of sodium hydroxide, 5-30 parts of anti-agglomerant, 0.1-10 parts of flow pattern modifier, 0.1-8 parts of filtration control agent, and a weighting agent, and the density of the high density ultramicro formation testing working solution is 1.5-2.5g/cm<3>. The preparation method comprises the following steps of: sequentially adding the raw materials into the water under the condition of stirring, and after uniform blending, obtaining the high density ultramicro formation testing working solution. The high density ultramicro formation testing working solution has excellent high temperature sedimentary stability and rheological property, and is applicable to formation testing working conditions of a deep well and an ultra deep well.
Description
Technical field
The present invention relates to a kind of high-density ultra micro formation testing working fluid and preparation method thereof, particularly relate to a kind of high-density ultra micro formation testing working fluid with excellent high sedimentation stability and rheological and preparation method thereof, belong to technical field of petroleum extraction.
Background technology
Oil test operation is to the operation that oil gas is tested after oil well completes.It is that geologic report is submitted in oil prospect pit to, obtains the means of significant data, for Evaluation of Oil And Gas provides basic foundation.Completion is an important process in oil-field development, and the open scheme of oil reservoir and borehole operation measure all will be realized by completion tubular column.
A current exploitation difficult problem is ultra deep well, the well depth of Holes of Complicated Wells is generally 6000-8000 rice, makes formation testing well-completion practice face high temperature, the harsh subsurface environment of high pressure.Under this severe rugged environment, when using many formation testings with packer tubing string to carry out formation testing, the problems such as the gap of long construction period, oil pipe and the borehole wall or sleeve pipe is little can be produced.If formation testing working fluid generation sedimentation, then the above formation testing tubing string of pkr can be caused to be buried, well in operation finally may be caused to scrap, contaminated oil gas-bearing formation, cause great financial loss.Ultra deep well formation testing well-completion practice proposes high requirement to the high temperature sedimentary stability of high-density formation testing working fluid and rheological.
In the prior art, the many employings of High Temperature High Pressure ultra deep well oil test operation is the formation testing working fluid that drilling fluid is transformed.And containing more low-density solid in drilling fluid, as clay; And high-density solid phase, as various weighting agents etc.Under long-term (12-20 days) high temperature stationary state in down-hole, in the formation testing working fluid of drilling fluid transformation, various additive very easily lost efficacy, produce low-density solid solidification and high-density solid phase precipitation phenomenon, very easily cause the generation of polluting reservoir and blocking the down hole problems such as pkr.Another kind of conventional high-density formation testing working fluid is density brine, but the viscosity of salt solution is too low, easily causes gas slippage excessive velocities and produces well control risk, and easily occurs the phenomenon such as low temperature crystallization and down-hole string corrosion at operation field.
Therefore, develop a kind of high temperature sedimentary stability and the excellent formation testing working fluid of rheological, make it be applicable to the oil test operation of ultra deep well, be still one of this area problem demanding prompt solution.
Summary of the invention
For solving the problems of the technologies described above, the object of the present invention is to provide a kind of high-density ultra micro formation testing working fluid and preparation method thereof.The present invention, by adopting Ultramicro Dispersion technology, makes to prepare high-density ultra micro formation testing working fluid and has excellent high temperature sedimentary stability and rheological, can be applicable to the oil test operation condition of deep-well, ultra deep well.
For achieving the above object, the invention provides a kind of high-density ultra micro formation testing working fluid, with parts by weight, its raw material composition comprises: water 100-500 part, high temperature resistance dispersion agent 0.1-10 part, high temperature resistance dispersion stabilizer 0.1-10 part, sodium hydroxide 0.6-2.0 part, anti-coalescing agent 5-30 part, flow pattern regulator 0.1-10 part, filtration control agent 0.1-8 part and weighting agent, and the density of described high-density ultra micro formation testing working fluid is 1.5-2.5g/cm
3.Wherein, the consumption of described weighting agent can be allocated as required by persons skilled in the art, as long as make the density of described high-density ultra micro formation testing working fluid reach 1.5-2.5g/cm
3.High-density ultra micro formation testing working fluid provided by the invention is the water base formation testing working fluid of a kind of high-density.
In above-specified high density ultra micro formation testing working fluid, preferably, described high temperature resistance dispersion agent comprises the water-soluble polymers that at least one molecular weight is not less than 2000.This water-soluble polymers comprises homopolymer and/or multipolymer.More preferably, the monomer of described water-soluble polymers comprises the combination of one or more in vinylformic acid, methylene-succinic acid, toxilic acid, maleic anhydride, Propylene glycol monoacrylate, vinyl sulfonic acid, acrylamido-2-propane sulfonic acid, acrylamide, styrene sulfonic acid, acrylated phosphate, methylvinylether, vinyl-acetic ester and their salt etc.When the water-soluble polymers being not less than 2000 when adopting two or more described molecular weight is as high temperature resistance dispersion agent, it mixes with any mass ratio.
In above-specified high density ultra micro formation testing working fluid, preferably, described high temperature resistance dispersion stabilizer comprise that organic acid polymkeric substance, molecular weight that organic acid salt, molecular weight that organic acid, molecular weight that molecular weight is not less than 150 be not less than 150 be not less than 150 are not less than the polymkeric substance of the organic acid salt of 150, molecular weight be not less than 150 organic acid and molecular weight be not less than the combination of one or more in the polymkeric substance of the organic acid salt of 150, phosphatide and polyacrylic ester etc.More preferably, the organic acid that described molecular weight is not less than 150 comprises the combination of one or more in polyhydric aliphatic acid, alkyl benzene sulphonate (ABS), paraffin sulfonates and linear alpha-alkene sulfonic acid etc.Wherein, the organic acid salt that described molecular weight is not less than 150 refers to that molecular weight is not less than the organic acid salt of 150, as mentioned above, it comprises the combination of one or more in polyhydric aliphatic hydrochlorate, alkylbenzene sulfonate, alkane sulfonate and linear alpha-alkene sulfonate etc.Described polyhydric aliphatic acid can be oleic acid etc.Described phosphatide can be Yelkin TTS etc.The monomer of described polyacrylic ester comprises methacrylic ester etc.When adopting two or more in above-mentioned substance as high temperature resistance dispersion stabilizer, it mixes with any mass ratio.
In above-specified high density ultra micro formation testing working fluid, preferably, described anti-coalescing agent comprises the combination of one or more in Sorbitol Powder, tetramethylolmethane, polyoxyethylene glycol, glycerine, neopentyl glycol, trimethyl propanol, monoethanolamine, diethanolamine, trolamine and tripentaerythritol etc.When adopting two or more in above-mentioned substance as anti-coalescing agent, it mixes with any mass ratio.
In above-specified high density ultra micro formation testing working fluid, preferably, described flow pattern regulator comprises the combination of one or more in Sulfite lignin, brown coal, modified lignin sulfonate, poly-phosphate and Weibull etc.Wherein, described modified lignin sulfonate is carry out the Sulfite lignin after sulfonation modifying by the conventional sulphonation method of modifying of this area.When adopting two or more in above-mentioned substance as flow pattern regulator, it mixes with any mass ratio.
In above-specified high density ultra micro formation testing working fluid, preferably, described filtration control agent comprises at least one polysaccharide derivates.More preferably, described polysaccharide derivates comprises modified-cellulose and/or starch etc.Most preferably, described modified-cellulose comprises carboxymethyl cellulose (CMC) and/or Polyanionic Cellulose (PAC) etc., and described starch comprises the combination of one or more in yam starch, W-Gum, tapioca (flour), wheat starch and Starch rice etc.When adopting two or more described polysaccharide derivates as filtration control agent, it mixes with any mass ratio.
In above-specified high density ultra micro formation testing working fluid, preferably, described weighting agent comprises the combination of one or more in barite, calcium carbonate, rhombspar, ilmenite, rhombohedral iron ore, peridotites, spathic iron ore, manganese oxide and Strontium Sulphate etc.When adopting two or more in above-mentioned substance as weighting agent, it mixes with any mass ratio.More preferably, the D of described weighting agent
50particle diameter is 0.5-10 micron.Most preferably, the D of described weighting agent
50particle diameter is 0.8-5 micron.In certain embodiments, the median size (D of described weighting agent
50) be less than 10 microns, in other embodiments, the median size (D of described weighting agent
50) be less than 4 microns, in some other embodiment, the median size (D of described weighting agent
50) be less than 2 microns.Persons skilled in the art can regulate and control the median size of described weighting agent according to actual needs.
The present invention also provides the preparation method of above-specified high density ultra micro formation testing working fluid, and it comprises the following steps:
Under agitation, in water, add high temperature resistance dispersion agent, high temperature resistance dispersion stabilizer, sodium hydroxide, anti-coalescing agent, flow pattern regulator, filtration control agent and weighting agent successively, after mixing, obtain described high-density ultra micro formation testing working fluid.Preparation method of the present invention adopts above-mentioned order of addition(of ingredients) can ensure the stable of reaction system, prepares the high-density ultra micro formation testing working fluid that suspension stability is strong.
In above-mentioned preparation method, preferably, the stirring velocity of described stirring is 8000-12000 rev/min.
According to the specific embodiment of the present invention, preferably, the preparation of above-specified high density ultra micro formation testing working fluid can be carried out in the crushing grinding device of described weighting agent.The crushing grinding device of this weighting agent and technology can be device and the technology of abrasive dust field routine, as long as described weighting agent can be made to reach required particle diameter.This pulverizing grinding technique can comprise jet mill, ball milling, high-performance wet-milling, high-performance dry grinding and other known technologies in abrasive dust field.Concrete preparation method comprises the following steps: in the crushing grinding device of weighting agent, add water, under agitation (preferred stirring velocity is 8000-12000 rev/min), add high temperature resistance dispersion agent, high temperature resistance dispersion stabilizer, sodium hydroxide, anti-coalescing agent, flow pattern regulator, filtration control agent and weighting agent successively, after mixing, obtain described high-density ultra micro formation testing working fluid.
The present invention utilizes weighting agent to form high density suspensions, reduces settling or the Subsidence trend of formation testing working fluid; The high temperature resistance dispersion agent on weighting agent ultrafine particle surface controls particles' interaction simultaneously, thus makes the rheological of formation testing working fluid more excellent.In addition, the existence of high temperature resistance dispersion stabilizer can produce discrete particle, thus can more effectively form filling filter cake, is conducive to reducing leak-off rate, makes the formation testing working fluid obtained have excellent thermostability.As can be seen here, high-density ultra micro formation testing working fluid of the present invention is in conjunction with high-density fine particle, particle surface dispersion agent is to the interactional control of colloid, and dispersion agent reduces the effect of leak-off rate, reach the effect of high-density, low viscosity and minimum sedimentation, there is excellent high temperature sedimentary stability and rheological.
The suspension stability of high-density ultra micro formation testing working fluid of the present invention is strong, and density reaches 1.5-2.5/cm
3, can meet well depth more than 6000 meters, bottom temperature is greater than 150 DEG C, the engineering time high temperature, high pressure, high-density, the long-time formation testing construction requirement that are greater than 15 days, and there is higher recycling be worth.
Embodiment
In order to there be understanding clearly to technical characteristic of the present invention, object and beneficial effect, existing following detailed description is carried out to technical scheme of the present invention, but can not be interpreted as to of the present invention can the restriction of practical range.
Embodiment 1
The present embodiment provides a kind of density to be 1.7g/cm
3high-density ultra micro formation testing working fluid, it is prepared by the following method:
100m is put in preparing tank
3fresh water, under the high-speed stirring of 8000-12000 rev/min, be sequentially added into the mixture (the two mixes with any mass ratio) of the mixture (the two mixes with any mass ratio) of 0.3t polyacrylate, 0.2t oleic acid and linolic acid sodium salt, 0.12t sodium hydroxide, 1t Sorbitol Powder and polyoxyethylene glycol, the low sticky PAC of 0.3t modified lignin mahogany sulfonate, 0.2t, ground barium sulfate 17.5t reach 1.7g/cm to the density of described high-density ultra micro formation testing working fluid
3, after being fully uniformly mixed, when employing laser diffraction analyzer records solid phase median size (D in working fluid
50) when being less than 4 microns (this solid phase median size is the median size of ground barium sulfate), obtain described high-density ultra micro formation testing working fluid.
Embodiment 2
The present embodiment provides a kind of density to be 2.1g/cm
3high-density ultra micro formation testing working fluid, it is prepared by the following method:
10m is put in high-performance wet-milling reactor
3fresh water, under the high-speed stirring of 8000-12000 rev/min, be sequentially added into the mixture (the two mixes with any mass ratio) of the mixture (the two mixes with any mass ratio) of the mixture (the two mixes with any mass ratio) of 0.05t polyacrylate and polyacrylamide amine salt, 0.03t oleic acid and linolic acid sodium salt, 0.012t sodium hydroxide, 0.1t Sorbitol Powder and polyoxyethylene glycol, the low sticky PAC of 0.05t modified lignin mahogany sulfonate, 0.01t, ground barium sulfate 2.75t reach 2.1g/cm to the density of described high-density ultra micro formation testing working fluid
3, be fully uniformly mixed, when employing laser particle analyzer records solid phase median size (D in working fluid
50) when being less than 3 microns (this solid phase median size is the median size of ground barium sulfate), obtain described high-density ultra micro formation testing working fluid.
Embodiment 3
The present embodiment provides a kind of density to be 2.3g/cm
3high-density ultra micro formation testing working fluid, it is prepared by the following method:
10m is put in high-performance wet-milling reactor
3fresh water, under the high-speed stirring of 8000-12000 rev/min, be sequentially added into 0.08t polyacrylate, the mixture (the two mixes with any mass ratio) of 0.04t oleic acid and linolic acid sodium salt, 0.01t methyl polyacrylic ester, 0.012t sodium hydroxide, 0.1t Sorbitol Powder, the mixture (three mixes with any mass ratio) of polyoxyethylene glycol and trolamine, 0.08t modified lignin mahogany sulfonate, the mixture (the two mixes with any mass ratio) of the low sticky PAC of 0.01t and xanthan gum, ground barium sulfate 3.25t reaches 2.3g/cm to the density of described high-density ultra micro formation testing working fluid
3, be fully uniformly mixed, when employing laser particle analyzer records solid phase median size (D in working fluid
50) when being less than 2 microns (this solid phase median size is the median size of ground barium sulfate), obtain described high-density ultra micro formation testing working fluid.
Embodiment 4
The present embodiment provides the rheology testing of the high-density ultra micro formation testing working fluid of embodiment 1, embodiment 2.Testing method is: by the high-density ultra micro formation testing working fluid of embodiment 1, embodiment 2 respectively normal temperature, just prepare after; And 160 DEG C, leave standstill after 20 days, survey its rheological property according to water-base drilling fluid test procedure (GB/T16783-1997), test result is as shown in table 1.
Table 1
Illustrate: AV represents apparent viscosity, PV represents plastic viscosity, and YP represents yield value, τ
1and τ
2representative is ingressed and egress (gel strength) respectively.
As can be seen from the rheological property parameter of table 1, high-density ultra micro formation testing working fluid of the present invention 160 DEG C leave standstill the viscosity after aging 20 days and shear force more static than high temperature before decrease; When the density of high-density ultra micro formation testing working fluid of the present invention is from 1.7g/cm
3be increased to 2.1g/cm
3time, the change of its viscosity, shear force is little, and fundamental property is good.As can be seen here, the high temperature sedimentary stability of the high-density ultra micro formation testing working fluid of different densities is good, and rheological is reasonable, meets the requirement of ultra deep well oil test operation.
Embodiment 5
The present embodiment provides the high temperature rheology of the on-the-spot formation testing mud (transformed by sulfonated drilling fluid and obtain) of the high-density ultra micro formation testing working fluid of embodiment 1 and Tarim Oilfield ultra deep well to test.The density of these two kinds of formation testing working fluids is identical.The raw material composition of this on-the-spot formation testing mud comprises (with the gross weight of described on-the-spot formation testing mud for benchmark): 4% soil paste, 0.5%NaOH, 8% sulfonated phenolic resin SMP-2,4% sulfonated humic acid chromium PSC-2,2% extraordinary thinner TRH-1(Bazhou Areas free thought applied chemistry Science and Technology Ltd. system), 12%NaCl, 9%KCl, ground barium sulfate reach 1.70g/cm to the density of this on-the-spot formation testing mud
3, water surplus.
Testing method is: according to on-the-spot bottom temperature, the high-density ultra micro formation testing working fluid of embodiment 1 and on-the-spot formation testing mud are left standstill 15 days at 160 DEG C respectively, it is made to be in identical state, then test the rheological property of these two kinds of formation testing working fluids according to water-base drilling fluid test procedure (GB/T16783-1997), test result is as shown in table 2.
Table 2
As can be seen from the rheological property parameter of table 2, leave standstill after 15 days at 160 DEG C, the apparent viscosity of this on-the-spot formation testing mud and plastic viscosity are 4 times of high-density ultra micro formation testing working fluid of the present invention, ingress and egress also sharply increases.The completion well depth 7500m of this Tarim Oilfield ultra deep well, under complicated completion interval of well body structure condition, the sedimentation plugged well lower packet of this on-the-spot formation testing mud and the risk of formation testing tubing string increase considerably.
Embodiment 6
High-density formation testing working fluid settlement stability system safety testing device in the present embodiment employing CN102818881A and method (application number: 201210299652.0, the applying date: on 08 21st, 2012, the present invention's quoting in full this application in this as a reference), sedimentation stability test is carried out to the on-the-spot formation testing mud in the high-density ultra micro formation testing working fluid of embodiment 1, embodiment 3 and embodiment 5.Testing method is: after the high-density ultra micro formation testing working fluid of embodiment 1, embodiment 3 is left standstill 20 days at 180 DEG C, survey its sedimentation stability respectively, obtain the sedimentation stability test result of the high-density ultra micro formation testing working fluid of different densities, as shown in table 3.The high-density ultra micro formation testing working fluid of embodiment 1 is left standstill 15 days at 160 DEG C, itself and on-the-spot formation testing mud is made to be in identical state, survey its sedimentation stability respectively, obtain the high-density ultra micro formation testing working fluid of equal densities and the sedimentation stability test result of on-the-spot formation testing mud, as shown in table 4.
Table 3
| Sample | Test condition | 1 point (N) | 2 points (N) | 3 points (N) | 4 points (N) | On average (N) |
| Embodiment 1 | 180 DEG C/20 days | 0.48 | 0.49 | 0.51 | 0.5 | 0.49 |
| Embodiment 3 | 180 DEG C/20 days | 0.89 | 0.82 | 0.77 | 0.83 | 0.85 |
Table 4
| Sample | Condition determination | 1 point (N) | 2 points (N) | 3 points (N) | 4 points (N) | On average (N) |
| Embodiment 1 | 160 DEG C/15 days | 0.44 | 0.46 | 0.48 | 0.42 | 0.48 |
| On-the-spot formation testing mud | 160 DEG C/15 days | 2.80 | 2.82 | 2.82 | 2.82 | 2.82 |
As can be seen from the data of table 3,180 DEG C of quiescence in high temperatures are after aging 20 days, high-density ultra micro formation testing working fluid of the present invention in density up to 2.3g/cm
3time, its sedimentation stability and density 1.7g/cm
3the sedimentation stability change of high-density ultra micro formation testing working fluid little.As can be seen from the data of table 4, under same density conditions, contrast high-density ultra micro formation testing working fluid of the present invention and the sedimentation stability of on-the-spot formation testing mud under 160 DEG C, 15 days continuous quiescent conditions, can find that the sedimentation stability of high-density ultra micro formation testing working fluid of the present invention is obviously good than on-the-spot formation testing mud, this illustrates that high-density ultra micro formation testing working fluid of the present invention can adapt to the on-the-spot demand for the permanent stability of formation testing working fluid of ultra deep well.
Claims (8)
1. a high-density ultra micro formation testing working fluid, with parts by weight, its raw material composition comprises: water 100-500 part, high temperature resistance dispersion agent 0.1-10 part, high temperature resistance dispersion stabilizer 0.1-10 part, sodium hydroxide 0.6-2.0 part, anti-coalescing agent 5-30 part, flow pattern regulator 0.1-10 part, filtration control agent 0.1-8 part and weighting agent, and the density of described high-density ultra micro formation testing working fluid is 1.5-2.5g/cm
3;
Described high temperature resistance dispersion agent comprises the water-soluble polymers that at least one molecular weight is not less than 2000;
Described high temperature resistance dispersion stabilizer comprises that organic acid polymkeric substance, molecular weight that organic acid salt, molecular weight that organic acid, molecular weight that molecular weight is not less than 150 be not less than 150 be not less than 150 are not less than the polymkeric substance of the organic acid salt of 150, molecular weight be not less than 150 organic acid and molecular weight be not less than the combination of one or more in the polymkeric substance of the organic acid salt of 150, phosphatide and polyacrylic ester;
Described anti-coalescing agent comprises the combination of one or more in Sorbitol Powder, tetramethylolmethane, polyoxyethylene glycol, glycerine, neopentyl glycol, trimethyl propanol, monoethanolamine, diethanolamine, trolamine and tripentaerythritol;
Described flow pattern regulator comprises the combination of one or more in Sulfite lignin, brown coal, modified lignin sulfonate, poly-phosphate and Weibull;
Described filtration control agent comprises at least one polysaccharide derivates;
Described weighting agent comprises the combination of one or more in barite, calcium carbonate, rhombspar, ilmenite, rhombohedral iron ore, peridotites, spathic iron ore, manganese oxide and Strontium Sulphate, and the D of described weighting agent
50particle diameter is 0.5-10 micron.
2. high-density ultra micro formation testing working fluid according to claim 1, wherein, the monomer of described water-soluble polymers comprises the combination of one or more in vinylformic acid, methylene-succinic acid, toxilic acid, maleic anhydride, Propylene glycol monoacrylate, vinyl sulfonic acid, acrylamido-2-propane sulfonic acid, acrylamide, styrene sulfonic acid, acrylated phosphate, methylvinylether, vinyl-acetic ester and their salt.
3. high-density ultra micro formation testing working fluid according to claim 1, wherein, the organic acid that described molecular weight is not less than 150 comprises the combination of one or more in polyhydric aliphatic acid, alkyl benzene sulphonate (ABS), paraffin sulfonates and linear alpha-alkene sulfonic acid.
4. high-density ultra micro formation testing working fluid according to claim 1, wherein, described polysaccharide derivates comprises modified-cellulose and/or starch.
5. high-density ultra micro formation testing working fluid according to claim 4, wherein, described modified-cellulose comprises carboxymethyl cellulose and/or Polyanionic Cellulose, and described starch comprises the combination of one or more in yam starch, W-Gum, tapioca (flour), wheat starch and Starch rice.
6. the preparation method of the high-density ultra micro formation testing working fluid described in any one of claim 1-5, comprising following steps:
Under agitation, in water, add high temperature resistance dispersion agent, high temperature resistance dispersion stabilizer, sodium hydroxide, anti-coalescing agent, flow pattern regulator, filtration control agent and weighting agent successively, after mixing, obtain described high-density ultra micro formation testing working fluid.
7. preparation method according to claim 6, wherein, the speed of described stirring is 8000-12000 rev/min.
8. the preparation method according to claim 6 or 7, it carries out in the crushing grinding device of described weighting agent.
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| CN104212417B (en) * | 2014-08-17 | 2017-09-05 | 无棣华信石油技术服务有限公司 | A kind of drilling fluid heavy weight additive and preparation method thereof |
| CN104564022A (en) * | 2014-09-03 | 2015-04-29 | 北京石大博诚科技有限公司 | BOSW supermicro oil production test liquid construction method |
| CN104610946B (en) * | 2014-12-11 | 2018-08-03 | 中国石油大学(北京) | Ultra micro oil base drilling fluid and preparation method thereof for high temperature and pressure ultradeep well |
| CN108384523A (en) * | 2018-03-07 | 2018-08-10 | 中石化石油工程技术服务有限公司 | A kind of high-temperature high-density high stability working solution |
| SG11202008458UA (en) * | 2018-04-03 | 2020-10-29 | Lanxess Solutions Us Inc | Crystallization suppressant combinations for high density clear brine fluids |
| CN110028938B (en) * | 2019-04-23 | 2020-12-04 | 中国石油大学(北京) | Ultrahigh-temperature high-density oil testing completion fluid and preparation method and application thereof |
| CN115703958B (en) * | 2021-08-17 | 2023-07-28 | 中国石油天然气集团有限公司 | High-density water-based oil testing liquid and preparation method thereof |
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| CN1989219A (en) * | 2004-07-22 | 2007-06-27 | 赫尔克里士公司 | Water-based drilling fluids |
| CN102234501A (en) * | 2010-04-27 | 2011-11-09 | 长江大学 | Ocean deepwater water-based constant-rheology drilling fluid |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1989219A (en) * | 2004-07-22 | 2007-06-27 | 赫尔克里士公司 | Water-based drilling fluids |
| CN102234501A (en) * | 2010-04-27 | 2011-11-09 | 长江大学 | Ocean deepwater water-based constant-rheology drilling fluid |
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