CN105295873B - A kind of water-base drilling fluid inhibitor and water-base drilling fluid and its application - Google Patents
A kind of water-base drilling fluid inhibitor and water-base drilling fluid and its application Download PDFInfo
- Publication number
- CN105295873B CN105295873B CN201510706225.3A CN201510706225A CN105295873B CN 105295873 B CN105295873 B CN 105295873B CN 201510706225 A CN201510706225 A CN 201510706225A CN 105295873 B CN105295873 B CN 105295873B
- Authority
- CN
- China
- Prior art keywords
- water
- drilling fluid
- base drilling
- inhibitor
- shale
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/22—Synthetic organic compounds
- C09K8/24—Polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/06—Clay-free compositions
- C09K8/12—Clay-free compositions containing synthetic organic macromolecular compounds or their precursors
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/02—Spotting, i.e. using additives for releasing a stuck drill
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
Abstract
The present invention provides a kind of water-base drilling fluid inhibitor and water-base drilling fluid and its applications.The water-base drilling fluid inhibitor includes polyoxyethylene sorbitan stearate.The water-base drilling fluid includes above-mentioned water-base drilling fluid inhibitor.The water-base drilling fluid inhibitor and water-base drilling fluid of the present invention can effectively inhibit the hydration swelling of shale gas shale, hence it is evident that reduce shale expansion rate, prevent cave-in, bit freezing etc..
Description
Technical field
The present invention relates to a kind of drilling fluid inhibitor and drilling fluid and its application, more particularly to a kind of water-base drilling fluid inhibits
Agent and water-base drilling fluid and its application belong to petroleum drilling technology field.
Background technology
China's shale gas resources recoverable reserves is up to 10.3 × 1012-47.0×1012Cubic meter has good exploration
Development prospect, once successfully scale exploration and development, can effectively alleviate China's oil gas imbalance between supply and demand, therefore shale gas is surveyed
It visits and exploitation has become " 12th Five-Year Plan " country Major Strategic.
At this stage, horizontal drilling technology is one of core technology of shale gas exploitation, is widely used in shale gas exploitation and bores
Well.In order to which later stage hydraulic fracturing is increased production, net horizontal section is distributed in intrinsic fracture development stratum more, and along minimum horizontal principal stress side
To drilling.In drilling process, drilling fluid filtrate is easily invaded inside shale gas shale, easily causes the aquation of shale gas shale
Expansion, so as to cause cave-in, bit freezing etc..Therefore, inhibiting the hydration swelling of shale gas shale becomes horizontal well development shale
One of key technology difficulty of gas resource.
Inhibitor is also known as anti-sloughing agent, is mainly used for preparing drilling fluid, when drilling fluid creeps into shale gas shale formation, can press down
The hydration swelling of shale gas shale processed, and then prevent cave-in, bit freezing etc. caused by the hydration swelling of shale gas shale.
At present, what shale gas horizontal well drilling in China's used is mostly oil base drilling fluid, although oil base drilling fluid is with excellent
Inhibition, but it prepares that cost is higher and there are environmental issue, and Slot Handling is difficult, once circulation problems occur, will make
Into heavy economic losses.Water-base drilling fluid then has of low cost and advantages of environment protection, but in shale gas Horizontal Well Drilling
In well, conventional water-base drilling fluid be difficult to solve the problems, such as shale gas shale hydration swelling this, so as to be difficult to meet shale air water
The engineering technology of horizontal well exploration needs.
Therefore, the research to the water-base drilling fluid inhibitor and water-base drilling fluid that can effectively inhibit Shale Hydration expansion,
It has important practical significance.
The content of the invention
In order to solve the above-mentioned technical problem, it is an object of the invention to provide a kind of effective aquations for inhibiting shale gas shale
Expansion, hence it is evident that reduce shale expansion rate, prevent cave-in, the water-base drilling fluid inhibitor and water-base drilling fluid of bit freezing.
In order to realize above-mentioned technical purpose, present invention firstly provides a kind of water-base drilling fluid inhibitor, the water-based drillings
Liquid inhibitor includes polyoxyethylene sorbitan stearate.
In the present invention, polyoxyethylene sorbitan stearate is polysorbate60, commercially available.
The present invention provides application of the above-mentioned polyoxyethylene sorbitan stearate as water-base drilling fluid inhibitor.
In above-mentioned water-base drilling fluid inhibitor provided by the invention, it is preferable that the water-base drilling fluid inhibitor further includes water.
In above-mentioned water-base drilling fluid inhibitor provided by the invention, it is preferable that the polyoxyethylene sorbitan is stearic
The weight of acid esters is the 1%-10% of the water-base drilling fluid inhibitor total weight.
In above-mentioned water-base drilling fluid inhibitor provided by the invention, it is preferable that the polyoxyethylene sorbitan is stearic
The weight of acid esters is the 3%-7% of the water-base drilling fluid inhibitor total weight.
Above-mentioned water-base drilling fluid inhibitor provided by the invention can be used for the hydration swelling for inhibiting shale gas shale.
The present invention also provides a kind of water-base drilling fluid, which includes above-mentioned water-base drilling fluid inhibitor.
The present invention provides application of the above-mentioned polyoxyethylene sorbitan stearate as water-base drilling fluid.
In above-mentioned water-base drilling fluid provided by the invention, it is preferable that the polyoxyethylene sorbitan stearate
Weight is the 1%-10% of water-base drilling fluid total weight；It is highly preferred that the weight of the polyoxyethylene sorbitan stearate
It measures as the 3%-7% of water-base drilling fluid total weight.
In above-mentioned water-base drilling fluid provided by the invention, it is preferable that further included in the water-base drilling fluid clay, sealing agent,
The combination of one or more of heavy weight additive, tackifier, lubricant, thinner, fluid loss additive and flocculant.
In above-mentioned water-base drilling fluid provided by the invention, for clay, sealing agent, heavy weight additive, tackifier, lubricant, drop
There is no particular limitation for the additive amount of stick, fluid loss additive and flocculant, can be respectively various contents commonly used in the art, excellent
Selection of land, in terms of the weight of the water contained in the water-base drilling fluid, the additive amount of the clay is 0%-5% (less than 5%), described
The additive amount of sealing agent is 0%-5% (less than 5%), and the additive amount of the heavy weight additive is 0%-300% (less than 300%), institute
The additive amount of tackifier is stated as 0%-1% (less than 1%), the additive amount of the lubricant is 0%-5% (less than 5%), described
The additive amount of thinner is 0%-5% (less than 5%), and the additive amount of the fluid loss additive is 0%-5% (less than 5%), described
The additive amount of flocculant is 0%-5% (less than 5%).
In above-mentioned water-base drilling fluid provided by the invention, for clay, sealing agent, heavy weight additive, tackifier, lubricant, drop
There is no particular limitation for the species of stick, fluid loss additive and flocculant, can be respectively various clays commonly used in the art, closure
Agent, heavy weight additive, tackifier, lubricant, thinner, fluid loss additive and flocculant are the common material in this field, commercially available
It obtains；
Preferably, the clay of use includes the combination of one or more of bentonite, sepiolite and attapulgite；
The sealing agent of use includes one or more of pitch, sulfonated gilsonite, nano silicon dioxide and nano barite
Combination；
The heavy weight additive of use includes barite and/or Iron Ore Powder；
The tackifier of use include high adhesive aggregation cationic cellulose, high viscous sanlose, acrylates and third
The combination of one or more of acrylamide copolymer and hydroxyethyl cellulose；
The lubricant of use includes plastic beads and/or graphite；
The thinner of use includes sulfonated-methyl-tannin, sulphur methyl tannin extract, Sulfonated Copolymer of Styrene and Maleic Anhydride and acetic acid
The combination of one or more of vinyl acetate-maleic anhydride multipolymer；
The fluid loss additive of use includes sanlose, lignite lye, nitro-humic acid sodium, chromium humic acid and carboxylic
The combination of one or more of propyl starch；
The flocculant of use includes acrylonitrile copolymer sylvite, acrylamide and sodium acrylate copolymer and complex ionic
The combination of one or more of high molecular weight polymers.
Above-mentioned water-base drilling fluid provided by the invention can be used for the hydration swelling for inhibiting shale gas shale.
To the water-base drilling fluid inhibitor and the preparation method of water-base drilling fluid in the present invention, without particular/special requirement, as long as
Proportionally each raw material is uniformly mixed.
The polyoxyethylene sorbitan stearate used in the present invention can to the hydration swelling of shale gas shale, point
Dissipating has high inhibition effect, be due to its in shale pore throat and shale surface with strong adsorption effect, shale hole can be changed
The performance of larynx and shale surface so as to the hydration swelling to shale gas shale and disperses have high inhibition effect, it is swollen to reduce shale
Swollen rate, and then can prevent cave-in, bit freezing and strengthen borehole wall stability and reduce underground complex accident.
Due to containing polyoxyethylene sorbitan tristearin in the water-base drilling fluid inhibitor and water-base drilling fluid of the present invention
Acid esters, hydration swelling to shale gas shale, it is scattered there is high inhibition effect, shale expansion rate can be substantially reduced, prevent well
Wall caves in, bit freezing etc., strengthens borehole wall stability and simultaneously reduces down hole problem.
Specific embodiment
In order to which technical characteristic, purpose and the advantageous effect to the present invention are more clearly understood, now to the skill of the present invention
Art scheme carry out it is described further below, but it is not intended that the present invention can practical range restriction.
Unless otherwise instructed, each material used is commercially available, wherein, polyoxyethylene sorbitan stearate
(polysorbate60) is produced by Chengdu Gracia chemical technology Co., Ltd, molecular weight 1311.68.
Embodiment 1
A kind of water-base drilling fluid inhibitor is present embodiments provided, is obtained through the following steps：
The deionized water of the polyoxyethylene sorbitan stearate of 5g and 95g are mixed, obtain water-base drilling fluid suppression
Preparation.The water-base drilling fluid inhibitor can be used directly as water-base drilling fluid.
Embodiment 2
A kind of water-base drilling fluid inhibitor is present embodiments provided, is obtained through the following steps：
The deionized water of the polyoxyethylene sorbitan stearate of 3g and 97g are mixed, obtain water-base drilling fluid suppression
Preparation.The water-base drilling fluid inhibitor can be used directly as water-base drilling fluid.
Embodiment 3
A kind of water-base drilling fluid inhibitor is present embodiments provided, is obtained through the following steps：
The deionized water of the polyoxyethylene sorbitan stearate of 7g and 93g are mixed, obtain water-base drilling fluid suppression
Preparation.The water-base drilling fluid inhibitor can be used directly as water-base drilling fluid.
Embodiment 4
A kind of water-base drilling fluid inhibitor is present embodiments provided, is obtained through the following steps：
The deionized water of the polyoxyethylene sorbitan stearate of 1g and 99g are mixed, obtain water-base drilling fluid suppression
Preparation.The water-base drilling fluid inhibitor can be used directly as water-base drilling fluid.
Embodiment 5
A kind of water-base drilling fluid inhibitor is present embodiments provided, is obtained through the following steps：
The deionized water of the polyoxyethylene sorbitan stearate of 10g and 90g are mixed, obtain water-base drilling fluid suppression
Preparation.The water-base drilling fluid inhibitor can be used directly as water-base drilling fluid.
Embodiment 6
A kind of water-base drilling fluid is present embodiments provided, is obtained through the following steps：
The polyoxyethylene sorbitan stearate of 5g, the deionized water of 147g, the bentonite of 4.5g, 2.9g are received
The sulfonated-methyl-tannin mixing of rice silica, the graphite of 4.4g and 2.9g, obtains water-base drilling fluid.
Embodiment 7
A kind of water-base drilling fluid is present embodiments provided, is obtained through the following steps：
By the polyoxyethylene sorbitan stearate of 5g, the deionized water of 45.7g, the sepiolite of 1.8g, 1.4g
The hydroxyethyl cellulose mixing of pitch, the Iron Ore Powder of 45.7g and 0.4g, obtains water-base drilling fluid.
Embodiment 8
A kind of water-base drilling fluid is present embodiments provided, is obtained through the following steps：
By the polyoxyethylene sorbitan stearate of 5g, the deionized water of 63.2g, the bentonite of 1.3g and 1.9g
Sulfonated gilsonite mixes, and obtains water-base drilling fluid.
Embodiment 9
The present embodiment is molten to the sodium metasilicate of the water-base drilling fluid inhibitor of embodiment 1-8, water-base drilling fluid, 10wt% respectively
Liquid (comparative example 1), 10wt% potassium formate solutions (comparative example 2) and deionized water (comparative example 3) carry out shale expansion rate and measure in fact
It tests.
The results are shown in Table 1 to shale expansion rate by embodiment 1-8, comparative example 1-3.Wherein, shale expansion rate measures real
The experimental method tested includes：
It is measured, shale gas page using linear expansion rate analyzer (LSM, purchased from North China Oilfield drilling technology research institute)
Rock comes from 108 block of Zhaotong County, Yunnan；
Shale gas shale is first broken into powder with pulverizer, 100 mesh sieves is crossed, is then in internal diameter before slate flour is added in
A filter paper is added in 13.50 millimeters of sample cell, and measures the interior height of sample cell；
10 grams of slate flours are weighed again in sample cell and add in a filter paper, are then compressed under the pressure of 6000psi
5min, measurement add in slate flour and compressed sample cell height, then original page sliver height Bt0To add in slate flour simultaneously
The difference of compressed sample cell height and the sample cell height before addition slate flour；
Sample cell is fixed in slurry cup, is slowly added into the embodiment 1-8 of 300mL and comparative example 1-3 respectively in slurry cup
Sample, and seal immediately；
Shale piece starts to expand, by record sheet (big pointer turn around representative expansion 1mm, small pointer turn around represent it is swollen
Swollen 1mm) record for 24 hours when shale piece expansion height Bt1, the control of continuous mode temperature is 25 DEG C.Expansion rate (ut1, %) and by as follows
Formula obtains：ut1=(Bt1-Bt0)×100/Bt0。
Table 1
By the results contrast of embodiment 1-8 in table 1 and comparative example 1-3, it is known that with potassium formate solutions, inorganic silicic acid salting liquid
If sodium silicate solution is compared with water, the water-base drilling fluid inhibitor of the invention containing polyoxyethylene sorbitan stearate
And water-base drilling fluid, the hydration swelling of shale gas shale can be significantly inhibited, shale expansion rate can be substantially reduced.
By the results contrast of embodiment 1 in table 1 and embodiment 4-5, it is known that when also containing water in water-base drilling fluid inhibitor
When, it, can be into one when the weight of polyoxyethylene sorbitan stearate is the 3-7% of the water-base drilling fluid inhibitor weight
Step inhibits the hydration swelling of shale gas shale, further reduces shale expansion rate.
By embodiment 1 in table 1 and the results contrast of embodiment 6-8, it is known that viscous when also further containing in water-base drilling fluid
During one or more in soil, sealing agent, heavy weight additive, tackifier, lubricant, thinner, fluid loss additive and flocculant, Neng Goujin
One step inhibits the hydration swelling of shale gas shale, further reduces shale expansion rate.
Above example illustrates the water-base drilling fluid inhibitor and water-base drilling fluid of the present invention, can effectively inhibit shale gas
The hydration swelling of shale, hence it is evident that reduce shale expansion rate, cave-in, bit freezing etc. are prevented, so as to strengthen borehole wall stability and subtract
Few down hole problem.
Claims (10)
1. a kind of water-base drilling fluid inhibitor, which includes polyoxyethylene sorbitan stearate,
The weight of the polyoxyethylene sorbitan stearate is the 1%-10% of the water-base drilling fluid inhibitor total weight.
2. water-base drilling fluid inhibitor according to claim 1, wherein, which further includes water.
3. water-base drilling fluid inhibitor according to claim 1, wherein, the polyoxyethylene sorbitan stearate
Weight be the water-base drilling fluid inhibitor total weight 3%-7%.
4. the application of claim 1-3 any one of them water-base drilling fluid inhibitor, wherein, which uses
In the hydration swelling for inhibiting shale gas shale.
5. a kind of water-base drilling fluid, which includes claim 1-3 any one of them water-base drilling fluid inhibitor.
6. water-base drilling fluid according to claim 5, wherein, the weight of the polyoxyethylene sorbitan stearate
For the 1%-10% of the water-base drilling fluid total weight.
7. water-base drilling fluid according to claim 6, wherein, the weight of the polyoxyethylene sorbitan stearate
For the 3%-7% of the water-base drilling fluid total weight.
8. water-base drilling fluid according to claim 5, wherein, clay, sealing agent, exacerbation are further included in the water-base drilling fluid
The combination of one or more of agent, tackifier, lubricant, thinner, fluid loss additive and flocculant.
9. water-base drilling fluid according to claim 8, wherein, in terms of the weight of the water contained in the water-base drilling fluid, institute
The additive amount of clay is stated as 0%-5%, the additive amount of the sealing agent is 0%-5%, and the additive amount of the heavy weight additive is 0%-
300%, the additive amount of the tackifier is 0%-1%, and the additive amount of the lubricant is 0%-5%, and the thinner adds
Dosage is 0%-5%, and the additive amount of the fluid loss additive is 0%-5%, and the additive amount of the flocculant is 0%-5%.
10. the application of claim 5-9 any one of them water-base drilling fluids, wherein, which is used to inhibit shale
The hydration swelling of gas shale.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510706225.3A CN105295873B (en) | 2015-10-27 | 2015-10-27 | A kind of water-base drilling fluid inhibitor and water-base drilling fluid and its application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510706225.3A CN105295873B (en) | 2015-10-27 | 2015-10-27 | A kind of water-base drilling fluid inhibitor and water-base drilling fluid and its application |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105295873A CN105295873A (en) | 2016-02-03 |
| CN105295873B true CN105295873B (en) | 2018-06-01 |
Family
ID=55193726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510706225.3A Active CN105295873B (en) | 2015-10-27 | 2015-10-27 | A kind of water-base drilling fluid inhibitor and water-base drilling fluid and its application |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105295873B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106833564B (en) * | 2017-01-06 | 2019-07-09 | 中国石油天然气集团公司 | A kind of water-base drilling fluid and its application suitable for shale gas long well section horizontal well |
| CN109021941B (en) * | 2018-09-20 | 2022-01-18 | 河北硅谷化工有限公司 | Coating flocculant for drilling fluid |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101705081A (en) * | 2009-11-17 | 2010-05-12 | 中国石油天然气股份有限公司 | Gemini quaternary-ammonium-salt water injection increasing agent |
-
2015
- 2015-10-27 CN CN201510706225.3A patent/CN105295873B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101705081A (en) * | 2009-11-17 | 2010-05-12 | 中国石油天然气股份有限公司 | Gemini quaternary-ammonium-salt water injection increasing agent |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105295873A (en) | 2016-02-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Broni-Bediako et al. | Oil well cement additives: a review of the common types | |
| CN109265093A (en) | Ultra-Low Density Cement Slurries are used in well cementation | |
| CN102504775B (en) | Large temperature difference cement slurry for cementing of deep well long isolation section and preparation method thereof | |
| CN104927805A (en) | High-density water-based drilling fluid applicable to continental deposit sensitive shale formation | |
| Lyu et al. | Experimental study of a degradable polymer drilling fluid system for coalbed methane well | |
| AU2013323976B2 (en) | Cement compositions for cementing in confined locales and methods for use thereof | |
| CN102477289A (en) | Drilling fluid | |
| CN109021940A (en) | High-temperature high-density high-performance environment-friendly water-base drilling fluid and preparation method thereof | |
| CN102453475A (en) | Leak-stopping agent for petroleum drilling, preparation method, and application thereof | |
| CN105295873B (en) | A kind of water-base drilling fluid inhibitor and water-base drilling fluid and its application | |
| CN105985758A (en) | Blocking agent, drilling fluid containing blocking agent, and preparation method of drilling fluid and application of blocking agent | |
| CN105295862B (en) | A kind of water-base drilling fluid inhibitor combination and water-base drilling fluid and its application | |
| CN105295863B (en) | A kind of water-base drilling fluid inhibitor and water-base drilling fluid and its application | |
| Kök et al. | Usage of vermiculite as additive material in water-based drilling muds | |
| CN115044355B (en) | Anti-collapse drilling fluid and preparation method and application thereof | |
| CN112442342B (en) | Using and maintaining method of upper stratum collapse-preventing drilling fluid | |
| CN110157397A (en) | A kind of drilling fluid nanometer film forming sealing agent and its preparation method and application | |
| Adnan et al. | The effect of varying shale concentrations on wellbore instability in drilling operations for Iraqi oil fields | |
| CN101638576B (en) | Shielding and temporary plugging gelling agent for drilling fluid and production method and use method thereof | |
| Cui et al. | Study of effects of downhole conditions on the setting time and compressive strength of MOS settable system by orthogonal experimental design | |
| CN111139048A (en) | Potassium-based cation flushing fluid for coal-based stratum drilling and preparation method thereof | |
| CN106433581A (en) | Clay-free high temperature resistance reservoir drilling fluid and preparation method thereof | |
| CN101942295B (en) | High temperature resisting rectorite water base drilling fluid for deep stratigraphical drilling | |
| CN101914371A (en) | Rectorite saturated brine drilling fluid for drilling under rock salt deep stratum | |
| CN105295868B (en) | A kind of water-base drilling fluid inhibitor, water-base drilling fluid and its application |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |