CN104479666A - Ultralow-density ceramsite proppant prepared from silica and preparation method of ceramsite proppant - Google Patents
Ultralow-density ceramsite proppant prepared from silica and preparation method of ceramsite proppant Download PDFInfo
- Publication number
- CN104479666A CN104479666A CN201410763476.0A CN201410763476A CN104479666A CN 104479666 A CN104479666 A CN 104479666A CN 201410763476 A CN201410763476 A CN 201410763476A CN 104479666 A CN104479666 A CN 104479666A
- Authority
- CN
- China
- Prior art keywords
- raw material
- parts
- silica
- preparation
- propping agent
- 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.)
- Granted
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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/80—Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Silicon Compounds (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention relates to an ultralow-density ceramsite proppant prepared from silica and a preparation method of the ceramsite proppant. The ceramsite proppant consists of the following raw materials in parts by weight: 60-80 parts of silica, 5-30 parts of low-aluminum and high-iron bauxite, 1-7 parts of limestone, 1-6 parts of talcum and 1-7 parts of forsterite powder. The preparation method comprises the following steps: breaking and intermediately crushing the raw materials, proportioning the raw materials in proportion, grinding the raw materials by virtue of a wet-process ball mill, removing large particles by virtue of a sieve of 80-110 mesh, and spray-drying so as to obtain a powdery material; forcedly balling the powdery material, drying the material until water content is less than 5wt%, and sieving by virtue of 18-30 mesh so as to obtain a half-finished product; and calcining the half-finished product to obtain a product, cooling the product to room temperature and sieving the product by virtue of 20-40 mesh so as to obtain a finished product with proper grain size, wherein the grain size of the broken raw materials is less than 0.056mm. The ceramsite proppant disclosed by the invention is low in apparent density, high in strength, low in turbidity, relatively low in acid solubility, and the ceramsite proppant is excellent in roundness and sphericity; and the preparation method is simple and is easy to operate.
Description
Technical field
The present invention relates to a kind of ceramsite propping agent, being specifically related to a kind of take silica as ultralow close ceramsite propping agent of raw material and preparation method thereof.
Background technology
Low-density ceramic proppant is as the substitute products of the type propping agents such as quartz sand, not only have the circularity sphericity that high intensity is become reconciled, more importantly the significantly raising of its flow conductivity, the frac job that is applied to oil-gas field for a long time, is also widely used in the frac job in shale gas field certainly.Along with breakthrough and the innovation of hydraulic fracturing technology, start to emerge to the Unprecedented demands of ultra-low-density ceramic proppant, be especially applied to the exploitation such as shale gas, coal-seam gas.
But at present, the propping agent product that a large amount of ceramsite propping agent manufacturer produces mostly adopt 55 ~ 70% aluminium content, alumina silica ratio large with 5 alumine, be Midst density product, intensity is generally lower.The starting material that the low-density ceramic proppant of domestic production mainly adopts are that pure bauxite mine is joined a part of low aluminium clay and partially sinters auxiliary agent, produce the low density product that the coverage of national standard and domestic industry standard defined is wider.
My company now adopts silica as production ultra-low-density ceramic proppant to make full use of the shortcomings of bauxitic clay class resource, take full advantage of the advantage of China's silica resource, the low grade ore in enormous quantities of association or the higher low bauxitic clay mine tailing of magazine content are processed and fully utilized, produces the ultralow close ceramsite propping agent that added value is higher.At present, not yet detailed standard is formulated to ultralow close haydite in industry.
Summary of the invention
The object of this invention is to provide a kind of take silica as ultralow close ceramsite propping agent of raw material and preparation method thereof, and low density, can meet of the fracturing fluid lighting well, reduces fracturing liquid preparation cost, also reduces frac job to the requirement of hardware device; High strength; Turbidity is low; Acid solubility is lower; And having excellent circularity and sphericity, preparation method is simple, easy handling.
The present invention take silica as the ultralow close ceramsite propping agent of raw material, and raw material consists of by mass fraction:
Silica 60-80 part, low aluminium height red bauxite 5-30 part, Wingdale 1-7 part, talcum 1-6 part, forsterite powder 1-7 part.
The present invention take silica as the ultralow close ceramsite propping agent of raw material, and raw material preferably consists of by mass fraction:
65 parts, silica, low aluminium height red bauxite 20 parts, 3 parts, Wingdale, 6 parts, talcum, 6 parts, forsterite powder.
The present invention adds silica, and adds mineralizer, and quartz transition when making calcining in silica is phosphorus quartz and cristobalite phase, and the product density obtained is lower, keeps certain intensity simultaneously, and silica cheaply, greatly reduces cost.
Described mineralizer is low aluminium height red bauxite, Wingdale, talcum and forsterite powder.
Take silica as the preparation method of the ultralow close ceramsite propping agent of raw material:
(1) raw material through broken, in broken after prepare burden in proportion again, after ball mill by wet process grinding through 80-110 eye mesh screen removing macrobead, spraying dry obtains powder grain material;
(2) powder grain material is forced after balling-up, dries to moisture and is less than 5%wt, and then sieve to obtain work in-process between 18-30 order;
(3) work in-process are sintered into finished product, be divided into after appropriate particle size get product after being cooled to room temperature through 20-40 mesh sieve.
After broken, the particle diameter of raw material is at below 0.056mm.
Grinding time is 1-2 hour.
Various raw material crushing is to below 0.056mm.
Calcining temperature is 1300 ~ 1500 DEG C, and calcination time is 3-5 hour.
The low volume density of the present invention, reaches 1.30g/cm
3below, the propping agent most important condition of current hydraulic fracturing job requirement is met; Low volume density, can reach 2.30g/cm
3below, of the fracturing fluid lighting can be met well, reduce fracturing liquid preparation cost, also reduce frac job to the requirement of hardware device; Under under 40MPa pressure, percentage of damage can reach less than 5.0%, 52MPa pressure, percentage of damage can reach less than 10.0%; Turbidity is low, can reach below 60FTU, well below Standard: not higher than 100FTU; Acid solubility is lower, under the prerequisite meeting other performances, does not also require higher than national standard: be no more than 5%; And have excellent circularity and sphericity, the degree of sphericity of more than 0.85/0.85 can be reached.Fracture support in the exploitation of shallow-layer oil well, Sweet natural gas and shale gas and the whole process that provides of passage are provided.
Than the present invention, there is following beneficial effect with natural siliceous sand:
The present invention has low volume density, meets the propping agent most important condition of current hydraulic fracturing job requirement; Low volume density, reduces fracturing liquid preparation cost, also reduces frac job to the requirement of hardware device; High strength; Turbidity is low, and acid solubility is lower; And have excellent circularity and sphericity.Improve the oil and gas production in the unit time, improve the length of service of Oil/gas Well; Be applicable to the exploitation of shale gas, coal-seam gas.Make full use of cheap silica and low bauxitic clay resource of tailings, turn waste into wealth, improve the market structure and the present situation of domestic and international fracturing propping agents, alleviate the excessive and pressure that feed rate is too low of alumine demand.
Embodiment
Below in conjunction with embodiment, the present invention is described further.
Embodiment 1
Raw material consists of by mass fraction:
Silica (Al
2o
3: 5%, SiO
2: 90%, Fe
2o
3: 3%, CaO:0.5%, MgO:0.5%, TiO
2: 0.5%, surplus: burn and lose); Low aluminium height red bauxite (Al
2o
3: 45%, SiO
2: 30%, Fe
2o
3: 11.6%, CaO:0.13%, MgO:0.4%, TiO
2: 0.28%, surplus: burn and lose); Wingdale (Fe
2o
3: 1%, CaO:56%, MgO:0.5%, surplus: burn and lose); Burn talcum (Al
2o
3: 1%, SiO
2: 60%, Fe
2o
3: 0.5%, CaO:1%, MgO:36%, TiO
2: 1%, surplus: burn and lose); Forsterite (Al
2o
3: 1%, SiO
2: 80%, Fe
2o
3: 5%, CaO:1%, MgO:10%, TiO
2: 1%, surplus: burn and lose).
The present embodiment is made up of the raw material of following mass fraction: 65 parts, silica, low aluminium height red bauxite 20 parts, 3 parts, Wingdale, 6 parts, talcum, 6 parts, forsterite powder.
Preparation method is as follows:
Various raw material crushing to below 0.056mm, according to after fully the mixing of as above ratio, with ball mill grinding to 1.5 hour; by 80 screen clothes; percent of pass reaches more than 99%, and powder mix is put into and forced tablets press to be formed into close to 1mm, dries to moisture and is less than 5%wt; work in-process are sieved to obtain between 18-30 order; be delivered to 1400 DEG C of calcinings in rotary kiln, fire 4 hours, then be cooled to normal temperature; divide through 20-40 mesh sieve, get between two-layer screen cloth for product.
Detect product performance according to SY/T5108-2006 standard, result is as shown in table 1.
Embodiment 2:
Raw material consists of by mass fraction:
Silica (Al
2o
3: 10%, SiO
2: 85%, Fe
2o
3: 2%, CaO:1%, MgO:0.2%, TiO
2: 0.2%, surplus: burn and lose); Low aluminium height red bauxite (Al
2o
3: 45%, SiO
2: 30%, Fe
2o
3: 11.6%, CaO:0.13%, MgO:0.4%, TiO
2: 0.28%, surplus: burn and lose); Wingdale (Al
2o
3: 0.3%; Fe
2o
3: 1%, CaO:55%, MgO:0.1%, surplus: burn and lose); Burn talcum (Al
2o
3: 0.5%, SiO
2: 58%, Fe
2o
3: 0.5%, CaO:1%, MgO:36%, TiO
2: 0.2%, surplus: burn and lose); Forsterite (Al
2o
3: 0.8%, SiO
2: 82%, Fe
2o
3: 3%, CaO:0.1%, MgO:8%, TiO
2: 1%, surplus: burn and lose).
The present embodiment is made up of the raw material of following mass fraction: 70 parts, silica, low aluminium height red bauxite 30 parts, 7 parts, Wingdale, 2 parts, talcum, 1 part, forsterite powder.
Preparation method is as follows:
Various raw material crushing is to below 0.056mm, and according to after fully the mixing of as above ratio, with ball mill grinding to 2 hour, by 0.025mm screen cloth, percent of pass reaches more than 99%.Powder mix is put into and is forced tablets press to be formed into close to 1mm, dries and is less than 5%wt to moisture, between 18-30 order, sieve to obtain work in-process; be delivered to 1300 DEG C of calcinings in rotary kiln, fire 5 hours, then be cooled to normal temperature; divide through 20-40 mesh sieve, get between two-layer screen cloth for product.
Detect product performance according to SY/T5108-2006 standard, result is as shown in table 1.
Embodiment 3
Raw material consists of by mass fraction:
Silica (Al
2o
3: 8%, SiO
2: 86%, Fe
2o
3: 1%, CaO:0.3%, MgO:0.2%, TiO
2: 0.2%, surplus: burn and lose); Low aluminium height red bauxite (Al
2o
3: 45%, SiO
2: 30%, Fe
2o
3: 11.6%, CaO:0.13%, MgO:0.4%, TiO
2: 0.28%, surplus: burn and lose); Wingdale (Al
2o
3: 0.1%; Fe
2o
3: 0.6%, CaO:56%, MgO:0.1%, surplus: burn and lose); Burn talcum (Al
2o
3: 0.3%, SiO
2: 58%, Fe
2o
3: 0.5%, CaO:1%, MgO:36%, TiO
2: 0.2%, surplus: burn and lose); Forsterite (Al
2o
3: 0.8%, SiO
2: 82%, Fe
2o
3: 3%, CaO:0.1%, MgO:8%, TiO
2: 1%, surplus: burn and lose).
The present embodiment is made up of the raw material of following mass fraction: 80 parts, silica, low aluminium height red bauxite 15 parts, 1 part, Wingdale, 5 parts, talcum, 3 parts, forsterite powder.
Preparation method is as follows:
Various raw material crushing is to below 0.056mm, and according to after fully the mixing of as above ratio, with ball mill grinding to 1 hour, by 0.025mm screen cloth, percent of pass reaches more than 99%.Powder mix is put into and is forced tablets press to be formed into close to 1mm, dries and is less than 5%wt to moisture, between 18-30 order, sieve to obtain work in-process; be delivered to 1500 DEG C of calcinings in rotary kiln, fire about 3 hours, then be cooled to normal temperature; divide through 20-40 mesh sieve, get between two-layer screen cloth for product.
Detect product performance according to SY/T5108-2006 standard, result is as shown in table 1.
The product performance detected result of table 1 embodiment 1-3
| Performance | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| Volume density (g/cm 3) | 1.26 | 1.23 | 1.20 |
| Volume density (g/cm 3) | 2.22 | 2.24 | 2.23 |
| Percentage of damage/52MPa (%) | 8.53 | 9.30 | 8.99 |
| Turbidity (FTU) | 47.1 | 53.8 | 53.1 |
| Acid solubility (%) | 3.3 | 3.7 | 4.2 |
| Circularity | 0.90 | 0.90 | 0.85 |
| Sphericity | 0.90 | 0.90 | 0.85 |
Claims (7)
1. be a ultralow close ceramsite propping agent for raw material with silica, it is characterized in that, raw material consists of by mass fraction:
Silica 60-80 part, low aluminium height red bauxite 5-30 part, Wingdale 1-7 part, talcum 1-6 part, forsterite powder 1-7 part.
2. according to claim 1 take silica as the ultralow close ceramsite propping agent of raw material, and it is characterized in that, raw material consists of by mass fraction:
65 parts, silica, low aluminium height red bauxite 20 parts, 3 parts, Wingdale, 6 parts, talcum, 6 parts, forsterite powder.
3. according to claim 1 take silica as the preparation method of the ultralow close ceramsite propping agent of raw material, and it is characterized in that, step is as follows:
(1) raw material through broken, in broken after prepare burden in proportion again, after ball mill by wet process grinding through 80-110 eye mesh screen removing macrobead, spraying dry obtains powder grain material;
(2) powder grain material is forced after balling-up, dries to moisture and is less than 5%wt, and then sieve to obtain work in-process between 18-30 order;
(3) work in-process are sintered into finished product, be divided into after appropriate particle size get product after being cooled to room temperature through 20-40 mesh sieve.
4. according to claim 3 take silica as the preparation method of the ultralow close ceramsite propping agent of raw material, it is characterized in that, after broken, the particle diameter of raw material is at below 0.056mm.
5. according to claim 3 take silica as the preparation method of the ultralow close ceramsite propping agent of raw material, and it is characterized in that, grinding time is 1-2 hour.
6. according to claim 3 take silica as the preparation method of the ultralow close ceramsite propping agent of raw material, and it is characterized in that, various raw material crushing is to below 0.056mm.
7. according to claim 3 take silica as the preparation method of the ultralow close ceramsite propping agent of raw material, and it is characterized in that, calcining temperature is 1300 ~ 1500 DEG C, and calcination time is 3-5 hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410763476.0A CN104479666B (en) | 2014-12-11 | 2014-12-11 | Ultralow close ceramsite propping agent with Silicon stone as raw material and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410763476.0A CN104479666B (en) | 2014-12-11 | 2014-12-11 | Ultralow close ceramsite propping agent with Silicon stone as raw material and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104479666A true CN104479666A (en) | 2015-04-01 |
| CN104479666B CN104479666B (en) | 2017-03-01 |
Family
ID=52754279
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410763476.0A Expired - Fee Related CN104479666B (en) | 2014-12-11 | 2014-12-11 | Ultralow close ceramsite propping agent with Silicon stone as raw material and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104479666B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104974740A (en) * | 2015-06-11 | 2015-10-14 | 中国石油天然气股份有限公司 | Preparation method of low density film-coated ceramsite |
| CN107267135A (en) * | 2017-06-30 | 2017-10-20 | 周远华 | A kind of proppant and preparation method thereof |
| CN107739198A (en) * | 2017-10-19 | 2018-02-27 | 铜川秦瀚陶粒有限责任公司 | A kind of low-density small particle haydite and preparation method |
| CN109439311A (en) * | 2018-11-29 | 2019-03-08 | 江苏华普泰克石油装备有限公司 | A kind of ceramsite sand containing cherty limestone |
| CN109517593A (en) * | 2018-11-29 | 2019-03-26 | 江苏华普泰克石油装备有限公司 | A kind of preparation method of ceramsite sand |
| CN111454053A (en) * | 2020-04-01 | 2020-07-28 | 河南天祥新材料股份有限公司 | Low-density high-strength ceramsite proppant and preparation method thereof |
| CN115180920A (en) * | 2022-08-09 | 2022-10-14 | 陕西延长石油压裂材料有限公司 | Ultralow-density ceramsite proppant and preparation method thereof |
| CN117142872A (en) * | 2023-08-31 | 2023-12-01 | 郑州市润宝耐火材料有限公司 | Ceramsite propping agent prepared from high-siliceous raw materials and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060196661A1 (en) * | 2005-03-07 | 2006-09-07 | Halliburton Energy Services, Inc. | Methods relating to maintaining the structural integrity of deviated well bores |
| CN101701149A (en) * | 2009-11-20 | 2010-05-05 | 中陶支撑剂(贵州)有限公司 | Low-density ceramsite propping agent |
| CN101824315A (en) * | 2010-05-11 | 2010-09-08 | 宜兴东方石油支撑剂有限公司 | Super-low-density proppant and preparation method thereof |
| CN102127418A (en) * | 2010-12-29 | 2011-07-20 | 北京奇想达科技有限公司 | Ultralight-weight proppant and preparation method thereof |
| US20120157358A1 (en) * | 2010-01-29 | 2012-06-21 | Oxane Materials, Inc. | Self-Toughened High-Strength Proppant and Methods Of Making Same |
-
2014
- 2014-12-11 CN CN201410763476.0A patent/CN104479666B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060196661A1 (en) * | 2005-03-07 | 2006-09-07 | Halliburton Energy Services, Inc. | Methods relating to maintaining the structural integrity of deviated well bores |
| CN101701149A (en) * | 2009-11-20 | 2010-05-05 | 中陶支撑剂(贵州)有限公司 | Low-density ceramsite propping agent |
| US20120157358A1 (en) * | 2010-01-29 | 2012-06-21 | Oxane Materials, Inc. | Self-Toughened High-Strength Proppant and Methods Of Making Same |
| CN101824315A (en) * | 2010-05-11 | 2010-09-08 | 宜兴东方石油支撑剂有限公司 | Super-low-density proppant and preparation method thereof |
| CN102127418A (en) * | 2010-12-29 | 2011-07-20 | 北京奇想达科技有限公司 | Ultralight-weight proppant and preparation method thereof |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104974740A (en) * | 2015-06-11 | 2015-10-14 | 中国石油天然气股份有限公司 | Preparation method of low density film-coated ceramsite |
| CN107267135A (en) * | 2017-06-30 | 2017-10-20 | 周远华 | A kind of proppant and preparation method thereof |
| CN107739198A (en) * | 2017-10-19 | 2018-02-27 | 铜川秦瀚陶粒有限责任公司 | A kind of low-density small particle haydite and preparation method |
| CN109439311A (en) * | 2018-11-29 | 2019-03-08 | 江苏华普泰克石油装备有限公司 | A kind of ceramsite sand containing cherty limestone |
| CN109517593A (en) * | 2018-11-29 | 2019-03-26 | 江苏华普泰克石油装备有限公司 | A kind of preparation method of ceramsite sand |
| CN111454053A (en) * | 2020-04-01 | 2020-07-28 | 河南天祥新材料股份有限公司 | Low-density high-strength ceramsite proppant and preparation method thereof |
| CN115180920A (en) * | 2022-08-09 | 2022-10-14 | 陕西延长石油压裂材料有限公司 | Ultralow-density ceramsite proppant and preparation method thereof |
| CN117142872A (en) * | 2023-08-31 | 2023-12-01 | 郑州市润宝耐火材料有限公司 | Ceramsite propping agent prepared from high-siliceous raw materials and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104479666B (en) | 2017-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104479666A (en) | Ultralow-density ceramsite proppant prepared from silica and preparation method of ceramsite proppant | |
| CN100368504C (en) | Super strength ceramic aggregate proppant and method for preparing same | |
| CN103484098B (en) | Ceramsite propping agent of low-density and high-strength and preparation method thereof | |
| CN102061159B (en) | High-density high-strength fracturing propping agent for oil and gas wells and preparation method thereof | |
| CN101831286B (en) | Low-density and high-strength ceramic proppant and production method thereof | |
| CN102786922B (en) | Method for preparing high-strength oil fracturing proppant by high-iron bauxite | |
| CN102732245B (en) | Low-density ceramsite proppant and method for preparing same | |
| AU2018200659A1 (en) | Proppant Material Incorporating Fly Ash and Method of Manufacture | |
| CN103773356B (en) | A kind of shale gas exploitation particulate material and preparation method thereof | |
| CN103525395A (en) | Ceramsite oil-gas fracturing propping agent and preparation method thereof | |
| CN105131934B (en) | A kind of double-layer high strength fracturing propping agents and preparation method thereof | |
| US20160053162A1 (en) | Method of manufacturing of light ceramic proppants and light ceramic proppants | |
| CN102220125A (en) | Low-density and high-strength silicon-carbide-based fracturing proppant | |
| CN105925257A (en) | Low-density ceramsite proppant and preparing method thereof | |
| CN103468239A (en) | Low-density high-strength ceramsite proppant prepared from flint clay as raw material and preparation method thereof | |
| CN103450873A (en) | Petroleum fracturing propping agent and preparation method thereof | |
| CN103497757A (en) | Petroleum fracturing propping agent containing fly ash in raw materials and preparation method thereof | |
| US20170226410A1 (en) | Proppant Material Incorporating Fly Ash and Method of Manufacture | |
| CN102268248B (en) | Low-density high-strength andalusite fracturing propping agent and production method thereof | |
| CN103468240B (en) | Ultralow-density ceramsite proppant with flint clay tailings as raw materials and preparation method of ultralow-density ceramsite proppant | |
| CN110028947A (en) | High-strength low close petroleum fracturing propping agent and preparation method are prepared using Coaseries kaolin | |
| CN103756665B (en) | A kind of take flint clay as low-density propping agent of raw material and preparation method thereof | |
| CN107879728A (en) | A kind of corrosion-resistant ceramic | |
| CN107033870A (en) | A kind of preparation method of low-density and high-strength petroleum fracturing propping agent | |
| CN102676151B (en) | Ultra-low-density ceramic proppant taking pebbles as main additive and preparation method thereof |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170301 Termination date: 20181211 |