CN104106602A - High-efficiency oilfield reinjection water bactericide and preparation method thereof - Google Patents
High-efficiency oilfield reinjection water bactericide and preparation method thereof Download PDFInfo
- Publication number
- CN104106602A CN104106602A CN201410340980.XA CN201410340980A CN104106602A CN 104106602 A CN104106602 A CN 104106602A CN 201410340980 A CN201410340980 A CN 201410340980A CN 104106602 A CN104106602 A CN 104106602A
- Authority
- CN
- China
- Prior art keywords
- parts
- oilfield reinjection
- reinjection water
- sterilizing agent
- preparation
- 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
Landscapes
- Agricultural Chemicals And Associated Chemicals (AREA)
Abstract
The invention discloses a high-efficiency oilfield reinjection water bactericide and a preparation method thereof, belonging to the technical field of industrial bactericide. The oilfield reinjection water bactericide is prepared from the following components in part by weight: 2-5 parts of hairyvein agrimonia herb, 3-6 parts of pomegranate rind, 2-3 parts of folium ilicis chinensis, 0.5-6 parts of 2-hydroxyl-1,3-bis(bi(2-ethoxyl) dodecyl ammonium bromide) propane, 2-4 parts of bis(N-dehydroabietyl-N,N-dimethyl)-N,Nc-(1,6-hexylidene) diammonium bromide, 0.5-1.5 parts of 1,3-bis(perfluoro butyl ethyl) imidazole iodide, 3-6 parts of imidazoline biguanide sulfate, 1-3 parts of dodecyl guanidin acetate, 0.5-1 parts of sodium metasilicate pentahydrate and 50-60 parts of water. The preparation method is simple, the prepared oilfield reinjection water bactericide has stable chemical performance and long sterilizing time, has no burning and explosion, is safe to transport and store and easy to popularize and apply.
Description
Technical field
The invention belongs to industrial bactericide technical field, be specifically related to a kind of efficient oilfield reinjection water sterilizing agent and preparation method thereof.
Background technology
Drop into after exploitation in oil field, and along with the growth of recovery time, the energy of oil reservoir own will constantly be consumed, cause formation pressure constantly to decline, underground crude oil is degassed in a large number, and viscosity increases, oil well output greatly reduces, and even can stop-spraying stop production, and causes underground residual a large amount of dead oils can not adopt out.In order to make up the underground deficit causing after crude oil extraction, keep or improve formation pressure, realize oil field stable high yield, and obtain higher recovery ratio, must carry out water filling to oil field.
Thereby in oil field secondary, tertiary oil recovery, need a large amount of re-injection water, owing to generally all containing a series of bacterial micro-organisms that are unfavorable for water flood recovery such as easily cause that metal erosion, formation blockage, chemical agent are gone bad such as sulfate reducing bacteria (SRB), saprophytic bacteria (TGB) and iron bacteria in re-injection water.The water of re-injection simultaneously contains higher calcium ions and magnesium ions, easily produces waterflood-transmission line and stratum serious scale, thereby causes waterflood-transmission line and formation blockage.These cause huge economic loss all to oil field production run.
The bactericide that tradition is used is all the compositions such as chloride, phosphorus, formaldehyde, and these materials itself are combustion-supporting, and high poison, has strong impulse smell, corrosion skin, and meeting combustible can burn, blast, volatile, tool is not long-lasting, and transport is very inconvenient.Use accidentally, can cause permanent damage to water table, make descendants thoroughly lose valuable back water source, seriously stimulation applications personnel's skin of this material simultaneously, eyes, mucous membrane, Long Term Contact is also easily carcinogenic.Therefore how overcoming the deficiencies in the prior art is problems that current industrial bactericide technical field is needed solution badly.
Summary of the invention
The present invention, in order to solve the deficiencies in the prior art, provides a kind of efficient oilfield reinjection water sterilizing agent and preparation method thereof, and this preparation method is simple, the reinjection water sterilizing agent stable chemical performance making, and sterilizing time is long-acting, does not burn, do not explode, transport storage safe.
The technical solution used in the present invention is as follows:
A kind of efficient oilfield reinjection water sterilizing agent, comprise the following component according to weight fraction meter: hairyvein agrimony 2-5 part, granatum 3-6 part, Chinese holly 2-3 part, 2-hydroxyl-1, two [two (2-ethoxy) dodecyl bromination ammonium] propane 0.5-6 part, two (the N-dehydrogenation fir base-N of 3-, N-dimethyl)-N, Nc-(1,6-hexylidene) bromination two ammonium 2-4 parts, 1,3-bis-(perfluoro butyl ethyl) imidazoles iodide 0.5-1.5 part, imidazoline biguanides sulphate 3-6 part, acetic acid dodine ester 1-3 part, metasilicate pentahydrate sodium 0.5-1 part, water 50-60 part.
In technical solution of the present invention, further preferably described efficient oilfield reinjection water sterilizing agent, comprise the following component according to weight fraction meter: 3 parts of hairyvein agrimonies, 5 parts of granatums, 2.5 parts of Chinese hollies, 2-hydroxyl-1, 3 parts, two [two (2-ethoxy) dodecyl bromination ammonium] propane of 3-, two (N-dehydrogenation fir base-N, N-dimethyl)-N, Nc-(1, 6-hexylidene) 3.4 parts of bromination two ammoniums, 1, 1 part, 3-bis-(perfluoro butyl ethyl) imidazoles iodide, 4.8 parts, imidazoline biguanides sulphate, 2 parts of acetic acid dodine esters, 0.8 part of metasilicate pentahydrate sodium, 56 parts, water.
The present invention also provides a kind of preparation method of efficient oilfield reinjection water sterilizing agent, comprises the steps:
Step (1), steams hairyvein agrimony and Chinese holly after 3-5min, shreds and is added to the water together with granatum, at 50-55 DEG C, soaks 2h, then be warming up to 63-65 DEG C, continue to soak 1h, follow ultrasonic 5min, rear filtration, filter residue is pressed extracting juice, merges with filtrate, obtains extract;
Step (2), by 2-hydroxyl-1, two [two (2-ethoxy) dodecyl bromination ammonium] propane, two (the N-dehydrogenation fir base-N of 3-, N-dimethyl)-N, Nc-(1,6-hexylidene) bromination two ammoniums and 1,3-bis-(perfluoro butyl ethyl) imidazoles iodide add in reactor, be warming up to 50-60 DEG C, then the extract and the metasilicate pentahydrate sodium that add wherein step (1) to obtain, be stirred to and be down to room temperature, then add wherein imidazoline biguanides sulphate and acetic acid dodine ester, after being stirred to and mixing, obtain efficient oilfield reinjection water sterilizing agent.
The pressure of the squeezing described in step in technical solution of the present invention (1) is 20-25MPa.
Mixing speed in step in technical solution of the present invention (2) is 60-80r/min.
compared with prior art, its beneficial effect is in the present invention:(1) oil field sulfate reductive bacterium can effectively be killed and suppress to oilfield reinjection water sterilizing agent of the present invention, and growing of oil-field flooding and other bacterium of oil recovery production system also had to significant inhibitory action; (2) preparation method of the present invention is simple, the reinjection water sterilizing agent stable chemical performance making, and sterilizing time is long-acting, does not burn, and does not explode, and transport storage safe, and the material such as not chloride, phosphorus, formaldehyde, avoided the destruction to water table; (3) product of the present invention also has certain antiscale scale effect, is easy to apply.
Embodiment
Below in conjunction with embodiment, further set forth the present invention.
Embodiment 1
A kind of efficient oilfield reinjection water sterilizing agent, comprise the following component according to weight fraction meter: 2 parts of hairyvein agrimonies, 3 parts of granatums, 2 parts of Chinese hollies, 2-hydroxyl-1, two [two (2-ethoxy) dodecyl bromination ammonium] 0.5 part, the propane of 3-, two (N-dehydrogenation fir base-N, N-dimethyl)-N, Nc-(1,6-hexylidene) 2 parts of bromination two ammoniums, 1,0.5 part, 3-bis-(perfluoro butyl ethyl) imidazoles iodide, 3 parts, imidazoline biguanides sulphate, 1 part of acetic acid dodine ester, 0.5 part of metasilicate pentahydrate sodium, 50 parts, water.
The preparation method of above-mentioned efficient oilfield reinjection water sterilizing agent, comprises the steps:
Step (1), steams hairyvein agrimony and Chinese holly after 3min, shreds and is added to the water together with granatum, at 50 DEG C, soaks 2h, then be warming up to 63 DEG C, continue to soak 1h, follow ultrasonic 5min, rear filtration, filter residue is that 20MPa presses down extracting juice at pressure, merges with filtrate, obtains extract;
Step (2), by 2-hydroxyl-1, two [two (2-ethoxy) dodecyl bromination ammonium] propane, two (the N-dehydrogenation fir base-N of 3-, N-dimethyl)-N, Nc-(1,6-hexylidene) bromination two ammoniums and 1,3-bis-(perfluoro butyl ethyl) imidazoles iodide add in reactor, be warming up to 50 DEG C, then the extract and the metasilicate pentahydrate sodium that add wherein step (1) to obtain, be stirred to and be down to room temperature, then add wherein imidazoline biguanides sulphate and acetic acid dodine ester, after being stirred to and mixing, obtain efficient oilfield reinjection water sterilizing agent.
Wherein, the mixing speed in step (2) is 60r/min.
Embodiment 2
A kind of efficient oilfield reinjection water sterilizing agent, comprise the following component according to weight fraction meter: 5 parts of hairyvein agrimonies, 6 parts of granatums, 3 parts of Chinese hollies, 2-hydroxyl-1, two [two (2-ethoxy) dodecyl bromination ammonium] 6 parts, the propane of 3-, two (N-dehydrogenation fir base-N, N-dimethyl)-N, Nc-(1,6-hexylidene) 4 parts of bromination two ammoniums, 1,1.5 parts, 3-bis-(perfluoro butyl ethyl) imidazoles iodide, 6 parts, imidazoline biguanides sulphate, 3 parts of acetic acid dodine esters, 1 part of metasilicate pentahydrate sodium, 60 parts, water.
The preparation method of above-mentioned efficient oilfield reinjection water sterilizing agent, comprises the steps:
Step (1), steams hairyvein agrimony and Chinese holly after 5min, shreds and is added to the water together with granatum, at 55 DEG C, soaks 2h, then be warming up to 65 DEG C, continue to soak 1h, follow ultrasonic 5min, rear filtration, filter residue is that 25MPa presses down extracting juice at pressure, merges with filtrate, obtains extract;
Step (2), by 2-hydroxyl-1, two [two (2-ethoxy) dodecyl bromination ammonium] propane, two (the N-dehydrogenation fir base-N of 3-, N-dimethyl)-N, Nc-(1,6-hexylidene) bromination two ammoniums and 1,3-bis-(perfluoro butyl ethyl) imidazoles iodide add in reactor, be warming up to 60 DEG C, then the extract and the metasilicate pentahydrate sodium that add wherein step (1) to obtain, be stirred to and be down to room temperature, then add wherein imidazoline biguanides sulphate and acetic acid dodine ester, after being stirred to and mixing, obtain efficient oilfield reinjection water sterilizing agent.
Wherein, the mixing speed in step (2) is 80r/min.
Embodiment 3
A kind of efficient oilfield reinjection water sterilizing agent, comprise the following component according to weight fraction meter: 3 parts of hairyvein agrimonies, 5 parts of granatums, 2.5 parts of Chinese hollies, 2-hydroxyl-1, two [two (2-ethoxy) dodecyl bromination ammonium] 3 parts, the propane of 3-, two (N-dehydrogenation fir base-N, N-dimethyl)-N, Nc-(1,6-hexylidene) 3.4 parts of bromination two ammoniums, 1,1 part, 3-bis-(perfluoro butyl ethyl) imidazoles iodide, 4.8 parts, imidazoline biguanides sulphate, 2 parts of acetic acid dodine esters, 0.8 part of metasilicate pentahydrate sodium, 56 parts, water.
The preparation method of above-mentioned efficient oilfield reinjection water sterilizing agent, comprises the steps:
Step (1), steams hairyvein agrimony and Chinese holly after 4min, shreds and is added to the water together with granatum, at 53 DEG C, soaks 2h, then be warming up to 64 DEG C, continue to soak 1h, follow ultrasonic 5min, rear filtration, filter residue is that 22MPa presses down extracting juice at pressure, merges with filtrate, obtains extract;
Step (2), by 2-hydroxyl-1, two [two (2-ethoxy) dodecyl bromination ammonium] propane, two (the N-dehydrogenation fir base-N of 3-, N-dimethyl)-N, Nc-(1,6-hexylidene) bromination two ammoniums and 1,3-bis-(perfluoro butyl ethyl) imidazoles iodide add in reactor, be warming up to 56 DEG C, then the extract and the metasilicate pentahydrate sodium that add wherein step (1) to obtain, be stirred to and be down to room temperature, then add wherein imidazoline biguanides sulphate and acetic acid dodine ester, after being stirred to and mixing, obtain efficient oilfield reinjection water sterilizing agent.
Wherein, the mixing speed in step (2) is 68r/min.
Reference examples 1
Be with the difference of embodiment 3: in efficient oilfield reinjection water sterilizing agent, do not contain granatum, in preparation method's step (1), do not add granatum.
Reference examples 2
Be with the difference of embodiment 3: in efficient oilfield reinjection water sterilizing agent, do not contain two (N-dehydrogenation fir base-N, N-dimethyl)-N, Nc-(1,6-hexylidene) bromination two ammoniums, be in preparation method's step (2), not add two (N-dehydrogenation fir base-N, N-dimethyl)-N, Nc-(1,6-hexylidene) bromination two ammoniums.
Reference examples 3
Be with the difference of embodiment 3: in efficient oilfield reinjection water sterilizing agent, do not contain 1,3-bis-(perfluoro butyl ethyl) imidazoles iodide, in preparation method's step (2), do not add 1,3-bis-(perfluoro butyl ethyl) imidazoles iodide.
performance Detection:
The embodiment of the present invention 1 ~ 3 product and comparative example 1 ~ 3 fungicide effect are as shown in table 1, wherein working concentration 15mg/l.
Table 1
As can be seen from the table, the efficient oilfield reinjection water sterilizing agent of embodiment 1-3 has good bactericidal effect and scale effect, and the effect in reference examples 1, reference examples 2 and reference examples 3 is inferior to embodiment; Embodiment 3 is optimum embodiment of the present invention.
More than show and described general principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and specification, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof
.
Claims (5)
1. an efficient oilfield reinjection water sterilizing agent, it is characterized in that comprising the following component according to weight fraction meter: hairyvein agrimony 2-5 part, granatum 3-6 part, Chinese holly 2-3 part, 2-hydroxyl-1, two [two (2-ethoxy) dodecyl bromination ammonium] the propane 0.5-6 parts of 3-, two (N-dehydrogenation fir base-N, N-dimethyl)-N, Nc-(1, 6-hexylidene) bromination two ammonium 2-4 parts, 1, 3-bis-(perfluoro butyl ethyl) imidazoles iodide 0.5-1.5 part, imidazoline biguanides sulphate 3-6 part, acetic acid dodine ester 1-3 part, metasilicate pentahydrate sodium 0.5-1 part, water 50-60 part.
2. efficient oilfield reinjection water sterilizing agent according to claim 1, it is characterized in that comprising the following component according to weight fraction meter: 3 parts of hairyvein agrimonies, 5 parts of granatums, 2.5 parts of Chinese hollies, 2-hydroxyl-1, two [two (2-ethoxy) dodecyl bromination ammonium] 3 parts, the propane of 3-, two (N-dehydrogenation fir base-N, N-dimethyl)-N, Nc-(1,6-hexylidene) 3.4 parts of bromination two ammoniums, 1,1 part, 3-bis-(perfluoro butyl ethyl) imidazoles iodide, 4.8 parts, imidazoline biguanides sulphate, 2 parts of acetic acid dodine esters, 0.8 part of metasilicate pentahydrate sodium, 56 parts, water.
3. the preparation method of efficient oilfield reinjection water sterilizing agent claimed in claim 1, is characterized in that comprising the steps:
Step (1), steams hairyvein agrimony and Chinese holly after 3-5min, shreds and is added to the water together with granatum, at 50-55 DEG C, soaks 2h, then be warming up to 63-65 DEG C, continue to soak 1h, follow ultrasonic 5min, rear filtration, filter residue is pressed extracting juice, merges with filtrate, obtains extract;
Step (2), by 2-hydroxyl-1, two [two (2-ethoxy) dodecyl bromination ammonium] propane, two (the N-dehydrogenation fir base-N of 3-, N-dimethyl)-N, Nc-(1,6-hexylidene) bromination two ammoniums and 1,3-bis-(perfluoro butyl ethyl) imidazoles iodide add in reactor, be warming up to 50-60 DEG C, then the extract and the metasilicate pentahydrate sodium that add wherein step (1) to obtain, be stirred to and be down to room temperature, then add wherein imidazoline biguanides sulphate and acetic acid dodine ester, after being stirred to and mixing, obtain efficient oilfield reinjection water sterilizing agent.
4. the preparation method of efficient oilfield reinjection water sterilizing agent according to claim 3, the pressure that it is characterized in that the squeezing described in step (1) is 20-25MPa.
5. the preparation method of efficient oilfield reinjection water sterilizing agent according to claim 3, is characterized in that the mixing speed in step (2) is 60-80r/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410340980.XA CN104106602B (en) | 2014-07-18 | 2014-07-18 | A kind of high-efficiency oilfield reinjection water sterilizing agent and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410340980.XA CN104106602B (en) | 2014-07-18 | 2014-07-18 | A kind of high-efficiency oilfield reinjection water sterilizing agent and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104106602A true CN104106602A (en) | 2014-10-22 |
| CN104106602B CN104106602B (en) | 2017-03-08 |
Family
ID=51703747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410340980.XA Active CN104106602B (en) | 2014-07-18 | 2014-07-18 | A kind of high-efficiency oilfield reinjection water sterilizing agent and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104106602B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104430564A (en) * | 2014-12-29 | 2015-03-25 | 江苏健神生物农化有限公司 | Oilfield reinjection water bactericide and preparation method thereof |
| CN106698753A (en) * | 2017-01-10 | 2017-05-24 | 天津市科达斯实业有限公司 | Water treatment agent for oilfield reinjection water |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102177913A (en) * | 2011-03-14 | 2011-09-14 | 山东瑞爱特环保科技有限公司 | Sterilizing stripper dedicated for oilfield injection water and preparation method thereof |
-
2014
- 2014-07-18 CN CN201410340980.XA patent/CN104106602B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102177913A (en) * | 2011-03-14 | 2011-09-14 | 山东瑞爱特环保科技有限公司 | Sterilizing stripper dedicated for oilfield injection water and preparation method thereof |
Non-Patent Citations (4)
| Title |
|---|
| YANGXIAOYAN ETAL.: ""Microstructure of N,Nc-bis(cetyldimethyl)-A,X-propane diammonium dibromide micelle and its dynamicsin solution studied by 1HNMR"", 《COLLOIDPOLYMSCI》 * |
| 张磊等: ""工业水处理用有机胍杀菌剂研究进展"", 《广东化工》 * |
| 曾华辉等: ""盐酸介质中松香基季铵盐Gemini表面活性剂对碳钢的缓释性能"", 《北京师范大学学报》 * |
| 王慧龙等: ""盐酸介质中Mannich碱对碳钢的缓释作用研究"", 《武汉城市建设学院学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104430564A (en) * | 2014-12-29 | 2015-03-25 | 江苏健神生物农化有限公司 | Oilfield reinjection water bactericide and preparation method thereof |
| CN106698753A (en) * | 2017-01-10 | 2017-05-24 | 天津市科达斯实业有限公司 | Water treatment agent for oilfield reinjection water |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104106602B (en) | 2017-03-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103881694B (en) | A kind of low consumption guar gum multinuclear cross-linking agent | |
| CN104610951A (en) | Sterilization algaecide used for oil field and preparation method thereof | |
| CN103215024A (en) | Seawater-based fracturing fluid for fracturing sea high-temperature oil-gas reservoir | |
| CN103074049A (en) | Fracturing fluid prepared by recovery waste water of crude oil and preparation method of fracturing fluid | |
| CN102259988B (en) | Multifunctional water treatment agent for oilfield reinjection water | |
| CN103497753B (en) | One is applicable to the of the fracturing fluid linking agent of concentrated water | |
| CN107513383A (en) | A kind of low concentration guanidine gum fracturing fluid for gas well | |
| CN102177913A (en) | Sterilizing stripper dedicated for oilfield injection water and preparation method thereof | |
| CN106283069A (en) | For oil-gas gathering and transportation corrosion inhibiter and preparation method thereof | |
| CN104106602A (en) | High-efficiency oilfield reinjection water bactericide and preparation method thereof | |
| CN202269372U (en) | Ozone sterilization system | |
| CN105010387A (en) | Preparation technology of improved oil field composite bactericide | |
| CN104119854A (en) | Anti-swelling clay stabilizer and preparation method thereof | |
| CN102492948B (en) | Extract corrosion inhibitor of sweet potato stems and lettuce flower stalks and preparation method thereof | |
| CN103265649B (en) | The method of pectin is extracted from lemon peel | |
| CN101884337B (en) | Oilfield reinjection water sterilizing agent | |
| CN104082337A (en) | Compound bactericide used in oilfield flooding | |
| CN104397018A (en) | Isothiazolinone water treatment bactericide and preparation method thereof | |
| CN107439596A (en) | A kind of oil field bactericide and its production technology | |
| CN101705489B (en) | Corrosion inhibitor of level I reverse osmosis water for sea water desalinization | |
| CN110054266B (en) | Deep-cleaning sewage treatment agent | |
| CN104430564A (en) | Oilfield reinjection water bactericide and preparation method thereof | |
| CN104170879A (en) | Anticorrosive bactericide for oilfield reinjection water and preparation method of anticorrosive bactericide | |
| CN104397055A (en) | Oilfield compound type bactericide and preparation method thereof | |
| GB2523482A (en) | Method for enhanced recovery of oil from oil reservoirs |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Lin Xuefang Inventor after: Huang Lin Inventor after: Lin Xueliang Inventor after: Jia Feng Inventor after: Tian Caixuan Inventor before: Li Ruiguo |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200603 Address after: 163411 Business Service Building 9, a11, North Gongjian District, Chengfengzhuang south 2nd Road, ranghu District, Daqing City, Heilongjiang Province Patentee after: DAQING DANFENG PETROLEUM TECHNOLOGY DEVELOPMENT Co.,Ltd. Address before: 256600 Shandong city of Qingdao province Quanzhou City Road No. 3 1407 Patentee before: QINGDAO PENGBO PETROLEUM TECHNICAL SERVICES Co.,Ltd. |