CN109647823B - Oil sludge cleaning device for oil storage tank - Google Patents
Oil sludge cleaning device for oil storage tank Download PDFInfo
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- CN109647823B CN109647823B CN201910080584.0A CN201910080584A CN109647823B CN 109647823 B CN109647823 B CN 109647823B CN 201910080584 A CN201910080584 A CN 201910080584A CN 109647823 B CN109647823 B CN 109647823B
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- injection pipe
- sealing
- pipe
- transmission shaft
- injection
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
- B08B9/0804—Cleaning containers having tubular shape, e.g. casks, barrels, drums
- B08B9/0813—Cleaning containers having tubular shape, e.g. casks, barrels, drums by the force of jets or sprays
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
- B08B9/0804—Cleaning containers having tubular shape, e.g. casks, barrels, drums
- B08B9/0808—Cleaning containers having tubular shape, e.g. casks, barrels, drums by methods involving the use of tools, e.g. by brushes, scrapers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
- B08B9/087—Cleaning containers, e.g. tanks by methods involving the use of tools, e.g. brushes, scrapers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
- B08B9/093—Cleaning containers, e.g. tanks by the force of jets or sprays
- B08B9/0933—Removing sludge or the like from tank bottoms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
- B08B9/093—Cleaning containers, e.g. tanks by the force of jets or sprays
- B08B9/0936—Cleaning containers, e.g. tanks by the force of jets or sprays using rotating jets
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning In General (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
The invention relates to an oil sludge cleaning device for an oil storage tank, and belongs to the technical field of oil tank cleaning equipment. This cleaning device comprises support frame, connector, injection pipe, transmission shaft, auger axle, intermediate pipe and drill bit: the middle pipe is fixedly arranged on the supporting frame; one end of the middle pipe is provided with a connector in a threaded manner; the other end of the middle pipe is provided with an injection pipe in a threaded manner; a transmission shaft is movably arranged in the middle pipe through symmetrically arranged supporting bearings; a turbine group is arranged on a transmission shaft between the supporting bearings; one end of the transmission shaft is slidably provided with a packing auger shaft; a drill bit is fixedly arranged at one end of the auger shaft; a transmission shaft at the other end of the auger shaft is movably provided with a sealing sleeve through a buffer spring; and a sealing ring edge is arranged on the inner wall of the middle pipe on one side of the sealing sleeve. The cleaning device has compact structure and smart design; the problems of low working efficiency and high labor intensity existing in the conventional manual cleaning of the oil storage tank are solved; the requirements of enterprises for production and use are met.
Description
Technical Field
The invention relates to an oil sludge cleaning device for an oil storage tank, and belongs to the technical field of oil tank cleaning equipment.
Background
In the fields of petroleum preparation, storage, and transportation; large-scale oil storage tanks (oil tanks having a capacity of 100 cubic meters or more); after a period of use, the bottom of the tank will mostly produce a large amount of sludge to form sludge. The existence of the oil sludge can cause the problems of the degradation of the quality of the stored oil and the corrosion to the tank body. Therefore, the large oil storage tank needs to be opened periodically for inspection and maintenance; the sludge in the tank must be cleaned before inspection and maintenance. Because the oil storage tank belongs to high-risk special equipment, spark can not be generated in the cleaning process, and the common cleaning device takes the motor as a power device, spark is easily generated in the working process, and the problem of high risk exists. In addition, because the oil sludge has the problems of high viscosity and poor fluidity, if common equipment such as an auger or a dredging pump is directly adopted for cleaning, the auger or the dredging pump can only output the oil sludge in contact with the auger or the dredging pump, and after the oil sludge in contact with the auger or the dredging pump is output, a cavity is formed around the auger or the dredging pump, so that the problem that the conventional common equipment cannot continuously work is caused. At present, the method of manually excavating after forced ventilation is generally adopted to discharge oil sludge from a slag hole at the bottom of an oil storage tank; the problems of low working efficiency and high labor intensity exist; can not meet the production and use requirements of enterprises.
Disclosure of Invention
The invention aims to: the oil storage tank sludge cleaning device is compact in structure, ingenious in design and capable of using high-pressure flushing water as a power source and solving the problems that the existing manual oil storage tank cleaning device is low in working efficiency and high in labor intensity.
The technical scheme of the invention is as follows:
an oil sludge cleaning device for an oil storage tank comprises a support frame, a connector, an injection pipe, a transmission shaft, a packing auger shaft, a middle pipe and a drill bit; the method is characterized in that: the middle pipe is fixedly arranged on the supporting frame; one end of the middle pipe is provided with a connector in a threaded manner; the other end of the middle pipe is provided with an injection pipe in a threaded manner; a transmission shaft is movably arranged in the middle pipe through symmetrically arranged supporting bearings; a turbine group is arranged on a transmission shaft between the supporting bearings; one end of the transmission shaft extends into the injection pipe, and a packing auger shaft is slidably arranged on the transmission shaft extending into the injection pipe through a spline groove; one end of the auger shaft extends to the outer end of the injection pipe and then is fixedly provided with a drill bit; a seal sleeve is movably arranged on the transmission shaft at the other end of the auger shaft through an assembly nut and a buffer spring; a sealing ring edge is arranged on the inner wall of the middle pipe on one side of the sealing sleeve; the sealing sleeve is intermittently connected with the sealing ring edge in a sealing way.
One end of the injection pipe is provided with a connecting flange; one end of the connecting flange is connected with a guide arc plate; a slag outlet is arranged on the side surface of the injection pipe; a plurality of communicating holes are formed in the injection pipe, and the communicating holes are positioned on the injection pipe at one side far away from the slag outlet; the communicating hole communicates the inside of the injection pipe with the injection flow passage; the communicating hole is internally provided with a sealing ball through a sealing spring.
The packing auger shaft consists of a packing auger shaft body, packing auger blades and a sealing disc; the auger shaft body is slidably arranged on the transmission shaft through a spline groove; the auger shaft body is provided with auger blades; one end of the auger shaft body is provided with a sealing disc; the drill bit is fixedly arranged after the other end of the auger shaft body extends to the outer end of the injection pipe.
A limiting flange is arranged inside one end of the middle pipe; the inner part of the injection pipe is arranged in a step shape; the sealing disc is positioned at the thick end part of the injection pipe; the circumferential surface of the sealing disc is connected with the injection pipe in a sliding and sealing way; the sealing disc is intermittently abutted and connected with the limiting flange and the inner stepped surface of the injection pipe.
A plurality of injection flow channels are uniformly distributed in the injection pipe; one end of the injection flow channel extends to the end face of the injection pipe and then is communicated with the outside; the other end of the injection flow channel is an inlet end and is communicated with the inside of the injection pipe; the inlet end of the injection flow channel is provided with a sealing ball through a sealing spring; when the sealing plate is abutted against the limit flange, the sealing plate is hermetically connected with the inlet end of the injection flow channel.
The invention has the advantages that:
the oil sludge cleaning device for the oil storage tank has a compact structure and is ingenious in design; high-pressure flushing water is used as a power source, and the oil sludge cleaning work can be finished without electric power; thereby meeting the requirement of mechanical cleaning of the oil storage tank; the problems of low working efficiency and high labor intensity existing in the conventional manual cleaning of the oil storage tank are solved; the requirements of enterprises for production and use are met.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the structure of FIG. 1 in the direction of A-A and in the working state;
fig. 3 is a schematic structural view in the direction B-B in fig. 1.
In the figure: 1. the device comprises a support frame, 2, a connector, 3, an injection pipe, 4, a transmission shaft, 5, an auger shaft, 6, a drill bit, 7, a middle pipe, 8, a support bearing, 9, a turbine group, 10, a buffer spring, 11, a sealing sleeve, 12, a sealing ring edge, 13, an auger shaft body, 14, auger blades, 15, a sealing disc, 16, a limiting flange, 17, an injection runner, 18, a sealing spring, 19, a sealing ball, 20, a slag outlet, 21, a communication hole, 22, a connecting flange, 23 and a guide arc plate.
Detailed Description
The oil sludge cleaning device for the oil storage tank comprises a support frame 1, a connector 2, an injection pipe 3, a transmission shaft 4, a packing auger shaft 5, a middle pipe 7 and a drill bit 6 (see the attached figure 1 in the specification).
The middle pipe 7 is fixedly arranged on the supporting frame 1; one end of the middle pipe 7 is provided with a connector 2 in a threaded manner; the connector 2 is communicated with an external high-pressure flushing water system through a hose during working.
The other end of the middle pipe 7 is provided with the injection pipe 3 (see the attached figure 1 in the specification).
One end of the injection pipe 3 is provided with a connecting flange 22; the cleaning device can be fixedly connected with a slag hole at the bottom of the oil storage tank through a connecting flange 22.
One end of the connecting flange 22 is connected with a guide arc plate 23; during operation, after the auger shaft 5 extends to the inside of the guide arc plate 23, in the rotating process, the oil sludge in the oil storage tank enters the inside of the injection pipe 3 along the guide arc plate 23 under the action of the auger shaft 5.
A transmission shaft 4 is movably arranged in the middle pipe 7 through a support bearing 8 which is symmetrically arranged; the transmission shaft 4 is a stepped shaft; a turbine group 9 is arranged on the transmission shaft 4 between the support bearings 8; when in operation, during the passage of high-pressure washing water from the inside of the intermediate pipe 7, it will impact the turbine group 9, causing it to rotate; the turbine group 9 drives the transmission shaft 4 to synchronously rotate during rotation.
One end of the transmission shaft 4 extends into the injection pipe 3, and a packing auger shaft 5 (see the attached figures 1 and 3 in the specification) is slidably mounted on the transmission shaft 4 extending into the injection pipe 3 through a spline groove; the auger shaft 5 can slide on the transmission shaft 4 along the spline groove when being stressed.
The packing auger shaft 5 consists of a packing auger shaft body 13, packing auger blades 14 and a sealing disc 15; the auger shaft body 13 is slidably arranged on the transmission shaft 4 through a spline groove; the auger shaft body 13 is provided with auger blades 14; one end of the packing auger shaft body 13 is provided with a sealing disc 15; the other end of the auger shaft body 13 extends to the outer end of the injection pipe 3 and then is fixedly provided with a drill bit 6 (refer to the attached figure 2 in the specification). The transmission shaft 4 can drive the auger shaft 5 to synchronously rotate when rotating.
The inner part of the injection pipe 3 is arranged in a step shape; a plurality of injection flow channels 17 are uniformly distributed in the injection pipe 3; one end of the injection flow channel 17 extends to the end face of the injection pipe 3 and then is communicated with the outside (refer to the attached figures 1 and 3 in the specification).
One end of the injection flow channel 17 is an inlet end thereof and is communicated with the interior of the injection pipe 3 (see the attached figure 1 in the specification); the inlet end of the injection flow channel 17 is provided with a sealing ball 19 through a sealing spring 18; when the injection pipe 3 is internally filled with high-pressure cleaning water, the sealing ball 19 is pushed to move upwards after overcoming the elastic force of the sealing spring 18, so that the purpose of communicating the injection pipe 3 with the injection flow channel 17 is achieved, the high-pressure flushing water in the injection pipe 3 during the work flushes the oil sludge layer at the bottom of the oil storage tank through the injection flow channel 17, and the purpose is as follows: firstly, the fluidity of the oil sludge is increased through water flow; secondly, the oil sludge layer is impacted by water pressure, so that the mixture of water and oil sludge is collected to the cleaning device, and a cavity is prevented from being formed around the cleaning device in the working process, so that the cleaning device can continuously discharge the mixture of water and oil sludge.
A limiting flange 16 is arranged inside one end of the middle pipe 7 connected with the injection pipe 3 (see the attached figures 1 and 2 in the specification); the seal disk 15 is located inside the thick end portion of the injection tube 3 and is in sliding sealing connection with the injection tube 3; the seal disk 15 is intermittently abutted and connected with the stopper flange 16 and the inner stepped surface of the ejection tube 3. The position-defining flange 16 and the inner stepped surface of the ejection tube 3 have the effect of defining the extreme position of the sealing disk 15; the sealing disk 15 can only act in the space between the stop flange 16 and the inner stepped surface of the ejector tube 3.
When the seal disk 15 is brought into abutting contact with the stopper flange 16, the seal disk 15 is sealingly connected to the inlet end of the injection flow path 17 (see FIG. 1 of the specification).
A seal sleeve 11 is movably arranged on the transmission shaft 4 at one end of the auger shaft 5 through an assembly nut and a buffer spring 10; a sealing ring edge 12 is arranged on the inner wall of the middle pipe 7 on one side of the sealing sleeve 11; the sealing sleeve 11 is intermittently and sealingly connected to the sealing rim 12. When the cleaning device is in an initial state, one end of the sealing sleeve 11 is in sealing connection with the sealing ring edge 12 under the action of the buffer spring 10.
The side surface of the injection pipe 3 is provided with a slag outlet 20; the purpose of the slag hole 20 is to: so that during operation, the fatlute that enters into in the injection pipe 3 can be arranged outward through slag notch 20 to the emergence of fatlute jam injection pipe 3 problem has been avoided.
A plurality of communication holes 21 are arranged in the injection pipe 3, and the communication holes 21 are positioned on the injection pipe 3 at the side far away from the slag outlet 20; the communication hole 21 communicates the inside of the injection tube 3 with the injection flow passage 17; the communicating hole 21 is provided with a sealing ball 19 (refer to the description attached with figures 1 and 3) through a sealing spring 18. The purpose of thus providing the communication hole 21 is: so that during operation, the high-pressure flushing water in the injection flow channel 17 can be flushed into the injection pipe 3 through the communication hole 21, so as to flush the inside of the injection pipe 3, and further, the oil sludge in the injection pipe 3 can be discharged through the slag outlet 20 finally under the action of the high-pressure flushing water.
When the oil storage tank oil sludge cleaning device works, firstly, a slag discharge hole at the bottom of the oil storage tank is opened; after one end of ventilation is carried out for a while, one end of the guide arc plate 23 of the cleaning device is inserted into an oil sludge layer inside the oil storage tank, the connecting flange 22 is fixedly connected with a slag discharge hole at the bottom of the oil storage tank through a bolt, and then the connector 2 is communicated with an external high-pressure flushing water system through a hose, so that the assembly work of the cleaning device can be completed.
After the assembly work of the cleaning device is completed, an external high-pressure flushing water system flushes high-pressure flushing water into the middle pipe 7 through the hose and the connector 2; after high-pressure washing water enters the middle pipe 7, the sealing sleeve 11 is extruded; the sealing sleeve 11 is forced to move to the right and is out of contact with the sealing ring rim 12, and at the moment, high-pressure washing water passes through the sealing ring rim 12 to enter the injection pipe 3 and is finally discharged outside through the injection pipe 3.
In the process, the flowing high-pressure flushing water drives the transmission shaft 4 and the auger shaft 5 to synchronously rotate through the turbine group 9; when the packing auger shaft 5 rotates, the packing auger shaft 5 is pushed to move forwards through the sealing disc 15 under the action of high-pressure flushing water in the injection pipe 3; thus, the auger shaft 5 has the composite motion of horizontal movement and rotation; and the auger shaft 5 drills the oil sludge at the bottom of the oil storage tank through the drill 6 to form a loose state, and then the auger blade 14 on the auger shaft 5 continuously pushes the loose oil sludge to move backwards.
When the sealing disc 15 of the packing auger shaft 5 is abutted against the injection pipe 3, the packing auger shaft 5 stops moving backwards, and one end of the packing auger shaft 5 is positioned inside the guide arc plate 23 (see the attached figure 2 in the specification). Then, the auger shaft 5 which rotates ceaselessly pushes the oil sludge into the injection pipe 3 through the auger blades 14; the oil sludge entering the injection pipe 3 is finally discharged out through the slag outlet 20 under the pushing action of the auger blade 14.
In the above process, the high-pressure washing water in the injection pipe 3 pushes the sealing ball 19 of the injection flow passage 17 to move upward against the elastic force of the sealing spring 18, so that the injection pipe 3 communicates with the injection flow passage 17. At this time, the high-pressure washing water in the injection pipe 3 enters the injection flow passage 17; the medium-high pressure flushing water entering the injection flow channel 17 is discharged from an outlet of a part of high-pressure flushing water, and oil sludge in the oil storage tank is flushed to enhance the fluidity of the oil sludge; the other part of the high-pressure washing water presses the sealing ball 19 in the communication hole 21 to enable the injection flow channel 17 to be communicated with the injection pipe 3 through the communication hole 21, at this time, the high-pressure washing water in the injection flow channel 17 can be flushed into the injection pipe 3 through the communication hole 21, so that the inside of the injection pipe 3 is washed, and further, the sludge entering the inside of the injection pipe 3 can be rapidly discharged through the slag outlet 20 under the washing effect of the high-pressure washing water.
The oil sludge cleaning device for the oil storage tank has a compact structure and is ingenious in design; high-pressure washing water is used as a power source, and cleaning work can be finished without electric power; thereby meeting the requirement of mechanical cleaning of the oil storage tank; the problems of low working efficiency and high labor intensity existing in the conventional manual cleaning of the oil storage tank are solved; the requirements of enterprises for production and use are met.
Claims (1)
1. An oil sludge cleaning device for an oil storage tank comprises a support frame (1), a connector (2), an injection pipe (3), a transmission shaft (4), a packing auger shaft (5), a middle pipe (7) and a drill bit (6); a middle pipe (7) is fixedly arranged on the support frame (1); one end of the middle pipe (7) is provided with a connector (2) in a threaded manner; the other end of the middle pipe (7) is provided with an injection pipe (3) in a threaded manner; a transmission shaft (4) is movably arranged in the middle pipe (7) through a support bearing (8) which is symmetrically arranged; a turbine group (9) is arranged on the transmission shaft (4) between the support bearings (8); one end of transmission shaft (4) extends to the inside of injection pipe (3), its characterized in that: a packing auger shaft (5) is slidably arranged on the transmission shaft (4) extending into the injection pipe (3) through a spline groove; one end of the auger shaft (5) extends to the outer end of the injection pipe (3) and then is fixedly provided with a drill bit (6); a seal sleeve (11) is movably arranged on the transmission shaft (4) at the other end of the auger shaft (5) through an assembly nut and a buffer spring (10); a sealing ring edge (12) is arranged on the inner wall of the middle pipe (7) at one side of the sealing sleeve (11); the sealing sleeve (11) is intermittently and hermetically connected with the sealing ring edge (12); a plurality of injection flow channels (17) are uniformly distributed in the injection pipe (3); one end of the injection flow channel (17) extends to the end surface of the injection pipe (3) and then is communicated with the outside; the other end of the injection flow channel (17) is an inlet end and is communicated with the inside of the injection pipe (3); the inlet end of the injection flow channel (17) is provided with a sealing ball (19) through a sealing spring (18); when the sealing disc (15) is butted with the limiting flange (16), the sealing disc (15) is hermetically connected with the inlet end of the injection flow channel (17); one end of the injection pipe (3) is provided with a connecting flange (22); one end of the connecting flange (22) is connected with a guide arc plate (23); a slag outlet (20) is arranged on the side surface of the injection pipe (3); a plurality of communicating holes (21) are formed in the injection pipe (3), and the communicating holes (21) are positioned on the injection pipe (3) far away from the slag outlet (20); the communicating hole (21) communicates the inside of the injection pipe (3) with the injection flow channel (17); a sealing ball (19) is arranged in the communicating hole (21) through a sealing spring (18); the packing auger shaft (5) consists of a packing auger shaft body (13), packing auger blades (14) and a sealing disc (15); a packing auger shaft body (13) is slidably arranged on the transmission shaft (4) through a spline groove; the auger shaft body (13) is provided with auger blades (14); one end of the auger shaft body (13) is provided with a sealing disc (15); the drill bit (6) is fixedly arranged after the other end of the auger shaft body (13) extends to the outer end of the injection pipe (3); a limiting flange (16) is arranged inside one end of the middle pipe (7); the inner part of the injection pipe (3) is arranged in a step shape; the sealing disc (15) is positioned at the thick end part of the injection pipe (3); the circumferential surface of the sealing disc (15) is connected with the injection pipe (3) in a sliding and sealing way; the sealing disc (15) is intermittently abutted and connected with the limiting flange (16) and the inner stepped surface of the injection pipe (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910080584.0A CN109647823B (en) | 2019-01-28 | 2019-01-28 | Oil sludge cleaning device for oil storage tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910080584.0A CN109647823B (en) | 2019-01-28 | 2019-01-28 | Oil sludge cleaning device for oil storage tank |
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| Publication Number | Publication Date |
|---|---|
| CN109647823A CN109647823A (en) | 2019-04-19 |
| CN109647823B true CN109647823B (en) | 2021-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910080584.0A Active CN109647823B (en) | 2019-01-28 | 2019-01-28 | Oil sludge cleaning device for oil storage tank |
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| CN (1) | CN109647823B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114888015B (en) * | 2022-05-23 | 2022-10-28 | 宁波市镇海子腾清洗服务有限公司 | Organic storage tank cleaning device and cleaning process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR200348632Y1 (en) * | 2004-01-13 | 2004-04-30 | (주)대동유공압 | Angle change device of rotary swivel nozzle |
| CN102192345A (en) * | 2010-03-02 | 2011-09-21 | 上海熊猫机械(集团)有限公司 | Hydraulic control valve |
| CN102230389B (en) * | 2011-06-03 | 2012-11-07 | 江苏华凯矿业科技有限公司 | Dust explosion suppression device |
| CN102536121B (en) * | 2012-02-08 | 2013-12-18 | 中国石油大学(北京) | Pulse type underground pressurization jet flow drilling method and device |
| US11225854B2 (en) * | 2015-01-26 | 2022-01-18 | Weatherford Technology Holdings, Llc | Modular top drive system |
| CN207898784U (en) * | 2017-12-31 | 2018-09-25 | 浙江省浦江高峰管道燃气有限公司 | A kind of big flow heavy caliber natural gas spark arrester for crystal processing |
| CN108246735A (en) * | 2017-12-31 | 2018-07-06 | 禹涵（上海）环保科技有限公司 | A kind of cleaning device for oil sludge conveyance conduit |
| CN109013608B (en) * | 2018-08-30 | 2021-06-04 | 中国石油化工股份有限公司 | Arch oil storage tank deposit clearing device |
| CN108672447B (en) * | 2018-08-31 | 2021-08-10 | 中国石油化工股份有限公司 | Oil storage tank belt cleaning device |
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Effective date of registration: 20210319 Address after: 100020 No. 22 North Main Street, Chaoyang District, Beijing, Chaoyangmen Applicant after: China Petroleum & Chemical Corp. Applicant after: GUDAO OIL PRODUCTION FACTORY, SINOPEC SHENGLI OILFIELD Co. Address before: Gudao Town, Hekou District, Dongying City, Shandong Province Applicant before: GUDAO OIL PRODUCTION FACTORY, SINOPEC SHENGLI OILFIELD Co. |
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