CN204283379U - Screen casing completes oil well intelligent water control pipe post - Google Patents
Screen casing completes oil well intelligent water control pipe post Download PDFInfo
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- CN204283379U CN204283379U CN201420768689.8U CN201420768689U CN204283379U CN 204283379 U CN204283379 U CN 204283379U CN 201420768689 U CN201420768689 U CN 201420768689U CN 204283379 U CN204283379 U CN 204283379U
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Abstract
The utility model screen casing completes oil well intelligent water control pipe post and relates to a kind of screen casing completed well water control pipe post.Its objective is to provide one how much can carry out automatically in real time regulating along with each section of down-hole moisture content, the screen casing that the oil-water mixture of restriction high-moisture percentage enters oil pipe completes oil well intelligent water control pipe post.The utility model Intelligent water-controlled tubing string comprises oil pipe column, hanging packer, packer in some pipes, some external packer of pipe and some Intelligent water-controlled short circuits, oil pipe column is positioned at screen casing, some external packer of pipe are arranged at intervals with between the outer wall of screen casing and oil well wellbore formation, in some pipes, packer interval is connected on oil pipe column, and packer and external packer of pipe one_to_one corresponding are arranged on the inside and outside both sides of screen casing in pipe, oil pipe column comprises some oil pipes, Intelligent water-controlled short circuit is alternately connected successively with oil pipe, each Intelligent water-controlled short circuit is in adjacent two pipes between packer, corresponding with the control water section in screen casing.
Description
Technical field
The utility model relates to a kind of screen casing completed well water control pipe post, particularly relates to a kind of tubing string adopting Intelligent water-controlled short circuit to realize Intelligent water-controlled.
Background technology
Along with the development of petroleum exploration and development technology, adopt horizontal well technology development of fields, become the effective technology means improving oil recovery rate, well yield, exploitation remaining oil, reduction production cost per tone oil.Horizontal well increases the contact area of pit shaft and oil reservoir, can develop oil sheet or the larger oil reservoir of vertical permeability better, and the effect in exploitation petroleum resources is increasingly important.And domestic water horizontal well majority has entered high water cut rate at present, after horizontal well produces water breakthrough, output has declined rapidly.Most of horizontal wells in some oil field is even just gone into operation with regard to water breakthrough soon, and the oil recovery benefit of horizontal well is had a strong impact on.Horizontal well is due to the particularity of well track, once water outlet is difficult to control.Therefore, each oil field, all in the urgent need to the water outlet of one effective level of control well, increases crude output, extends the water control technique in horizontal well life-span.
At present, the horizontal well water control technique being applied in oil field mainly contains three kinds: one, segmentation variable density screen casing water control technique: this technology is according to the change of Reservoir Permeability, change the Kong Mi of horizontal segment every section screen casing, utilize that different holes is close regulates throttling, adjust well bottom pressure section, for Homogeneous Reservoir, reduce heel end hole close, increase difference pressuring loss; Increase toe-end hole close, reduce difference pressuring loss, to reach balanced production pressure reduction, reduce the object of bottom water coning speed.Two, central tube water control technique: the principle of this technology is on the basis of screen casing, bushing pipe or perforation completion, a minor diameter tubing is hung under horizontal segment, stretch into net horizontal section certain length, and close the annular space between little oil pipe and sleeve pipe with packer, change the flow direction of horizontal well heel end, make pressure traverse and pit shaft inflow profile become mild.Three, ICD water control technique: ICD (Inflow Control Device) is a kind of balanced flow dynamic control device, and equilibrium level section is lost along stroke pressure, obtains the approaches uniformity inflow profile of oil reservoir along horizontal well pit shaft.ICD application of installation is combined with screen casing mostly, and reservoir fluid enters the annular gap between base tube and screen casing through screen casing, flows into ICD device, then enters in base tube and be plucked out of the ground, and reaches balancing flow and controls object.
But, all there are two major defects in these water control techniques currently used: one, how much cannot carry out automatically and in real time regulating according to each section of down-hole oil reservoir moisture content, segmentation variable density screen casing water control technique need according to the change of Reservoir Permeability, and in design level section, the screen casing hole of every section is close in advance; Central tube water control technique must in advance according to reservoir geology feature design centre pipe diameter and the length stretching into horizontal segment; ICD water control technique is also the quantity designing ICD water-control valve according to reservoir geologic characteristic in advance.Two, existing horizontal well water control technique quantitatively can only limit the inflow of down-hole fluid-mixing, is collecting reservoir geology data in advance, carries out deisgn product and tool parameters after data analysis, can reach production profile equilibrium, thus the cone reducing water enters after expecting to go into the well.But in practical application, down-hole state is not stopping change, adopt these control wetting systems existing once tubing string enters well, parameter cannot adjust or change, and does not reach desirable control water effect at all.
Utility model content
The technical problems to be solved in the utility model is to provide one and how much can carries out automatically in real time regulating along with each section of down-hole moisture content, and the screen casing that the oil-water mixture of restriction High water cut enters oil pipe completes oil well intelligent water control pipe post.
The utility model screen casing completes oil well intelligent water control pipe post, comprise oil pipe column, hanging packer, packer in some pipes, screen casing, some external packer of pipe and some Intelligent water-controlled short circuits, described oil pipe column hangs the lower end being fixed on upper strata sleeve pipe by hanging packer, oil pipe column is positioned at screen casing, some external packer of pipe are arranged at intervals with between the outer wall of described screen casing and oil well wellbore formation, described external packer of pipe contacts with wellbore formation and seals, in described some pipes, packer interval is connected on oil pipe column, in pipe, the contact internal walls of packer and screen casing seals, and packer and external packer of pipe one_to_one corresponding are arranged on the inside and outside both sides of screen casing in pipe, in adjacent two couples pipe, packer and external packer of pipe will be separated into some control water sections between oil pipe column and oil well wellbore formation, described oil pipe column comprises some oil pipes, described Intelligent water-controlled short circuit is alternately connected successively with oil pipe, each Intelligent water-controlled short circuit is in adjacent two pipes between packer, corresponding with the control water section in screen casing, Intelligent water-controlled short circuit comprises base tube, self-regulation flow control valve and screen cloth, the two ends of described base tube are connected with oil pipe respectively, the circumferential tube wall of base tube offers some valve installing holes, in each valve installing hole, self-regulation flow control valve is installed, described screen cloth is fixedly mounted on base tube outside, filtrate runner is formed between screen cloth and base tube, described filtrate runner is connected with the inlet of self-regulation flow control valve.
The utility model screen casing completes oil well intelligent water control pipe post, and in wherein said pipe, packer is mechanical packer, hydraulic packer or chance oil/water inflatable packer, and described external packer of pipe is chemical packer.
The utility model screen casing completes oil well intelligent water control pipe post, and it is outside that wherein said screen cloth covers self-regulation flow control valve, and the two ends of screen cloth are fixedly connected with by retainer ring with between base tube.
The utility model screen casing completes oil well intelligent water control pipe post, is provided with guide shoe bottom wherein said oil pipe column.
The utility model screen casing completes oil well intelligent water control pipe post, and wherein said oil well is horizontal well or straight well.
The utility model screen casing completes oil well intelligent water control pipe post, is filled with gravel between wherein said screen casing and oil well wellbore formation.
The utility model screen casing completes oil well intelligent water control pipe post difference from prior art and is that the utility model screen casing completes oil well intelligent water control pipe post and adopts packer and some external packer of pipe in some pipes will to be separated into some control water sections between oil pipe column and oil well wellbore formation, oil pipe column comprises some oil pipes, Intelligent water-controlled short circuit is alternately connected with oil pipe, the corresponding control water section of each Intelligent water-controlled short circuit, self-regulation flow control valve is provided with in Intelligent water-controlled short circuit, this flow control valve can according to the viscosity adjustment aperture flowing into oil-water mixture, when the moisture content high viscosity hour of oil-water mixture, the aperture of self-regulation flow control valve diminishes, the oil mixing with water flow quantity entered diminishes, when the moisture content low viscosity of oil-water mixture is large, the aperture of self-regulation flow control valve becomes large, the oil mixing with water flow quantity entered becomes large, utilize the characteristic of self-regulation flow control valve, the some control water sections after to separation can be realized and carry out Discrete control, the oil-water mixture " preferentially " of the reservoir making moisture content low enters oil pipe, the oil-water mixture of the reservoir that restriction moisture content is high enters the flow of oil pipe.Further, self-regulation flow control valve can regulate continuously in real time with the flow of water-cut variation to oil-water mixture of segmentation packing each section of reservoir, reaches the technique effect of oil well segmentation packing, intelligent control water.
The utility model screen casing completes oil well intelligent water control pipe post and both may be used for horizontal well, also may be used for straight well.
Complete oil well intelligent water control pipe post below in conjunction with accompanying drawing to screen casing of the present utility model to be described further.
Accompanying drawing explanation
Fig. 1 is the structural representation that the utility model screen casing completes the first embodiment of oil well intelligent water control pipe post;
Fig. 2 is the structural representation that the utility model screen casing completes oil well intelligent water control pipe post the second embodiment;
Fig. 3 is the front sectional view that the utility model screen casing completes Intelligent water-controlled short circuit in oil well intelligent water control pipe post.
Detailed description of the invention
As shown in Figure 1, the utility model screen casing completes oil well intelligent water control pipe post and comprises packer 3, screen casing 5 and some external packer of pipe 6 in oil pipe column 1, hanging packer 2, some pipes.Oil pipe column 1 hangs the lower end being fixed on upper strata sleeve pipe 4 by hanging packer 2, oil pipe column 1 is positioned at screen casing 5.Be arranged at intervals with some external packer of pipe 6 between the outer wall of screen casing 5 and oil well wellbore formation, external packer of pipe 6 contacts with wellbore formation and seals, and external packer of pipe 6 is chemical packer.In some pipes, packer 3 interval is connected on oil pipe column 1, in pipe, packer 3 seals with the contact internal walls of screen casing 5, and packer 3 and external packer of pipe 6 one_to_one corresponding are arranged on the inside and outside both sides of screen casing 5 in pipe, in pipe, packer 3 is mechanical packer, hydraulic packer or chance oil/water inflatable packer, and in pipe, the quantity of packer 3 determines according to factors such as the length of horizontal well.In adjacent two couples pipe, packer 3 and external packer of pipe 6 will be separated into some control water sections between oil pipe column 1 and oil well wellbore formation.Oil pipe column 1 comprises some oil pipes 12, and Intelligent water-controlled short circuit 11 is alternately connected successively with oil pipe 12, and each Intelligent water-controlled short circuit 11 is in adjacent two pipes between packer 3, corresponding with the control water section in screen casing 5.Guide shoe 15 is provided with bottom oil pipe column 1.
As shown in Figure 3, Intelligent water-controlled short circuit 11 comprises base tube 111, self-regulation flow control valve 112 and screen cloth 113, and the two ends of base tube 111 are threaded with oil pipe 12 respectively.The circumferential upper tube wall of base tube 111 offers some valve installing holes, in each valve installing hole, self-regulation flow control valve 112 is installed, it is outside that screen cloth 113 covers self-regulation flow control valve 112, and the two ends of screen cloth 113 are fixedly connected with by retainer ring 115 with between base tube 111.Form filtrate runner 114 between screen cloth 113 and base tube 111, filtrate runner 114 is connected with the inlet of self-regulation flow control valve 112.Wherein, what self-regulation flow control valve 112 adopted is a kind of flow control valve disclosed in pct international patent application WO2008/004875A1, the control water principle of this control valve: according to Bernoulli equation hydrodynamic pressure and the constant theory of local pressure loss sum, by the aperture of video disc in the change control apparatus that flows through the different fluid viscosity of device.When the oil-water mixture that relative viscosity is higher flows through valve body, video disc aperture is larger; When the lower water of relative viscosity or air-flow are through valve body, the pressure drop that video disc causes because of viscosity B coefficent turns aperture down automatically, thus reaches control water, increases the object of oil.
The utility model screen casing complete oil well intelligent water control pipe post under enter in horizontal well after, by the squeezing of chemical packer medicament between screen casing 5 and wellbore formation, solidify the external packer of pipe 6 of rear formation high strength, a kind of annular chemical packer material disclosed in Chinese invention patent CN101899291A selected by this chemical packer medicament.Hanging packer 2 and the interior packer 3 of pipe set in screen casing 5, give up, trip out running tool, completion.In adjacent two couples pipe, packer 3 and external packer of pipe 6 will be separated into some control water sections between oil pipe column 1 and oil well wellbore formation, and each control water Duan Yuyi Intelligent water-controlled short circuit 11 is corresponding.Oil-water mixture flows in screen casing 5 by the sieve aperture on screen casing 5, oil-water mixture enters filtrate runner 114 by the screen cloth 113 of Intelligent water-controlled short circuit 11 outside, then entered in base tube 111 by self-regulation flow control valve 112 and be plucked out of the ground, self-regulation flow control valve 112 is according to the aperture of the oil mixing with water fluid viscosity adjusting control valve flowed through, when the viscosity of oil-water mixture is larger (moisture content is low), the aperture of control valve becomes large, the oil mixing with water flow quantity entering base tube 111 improves, when the viscosity of oil-water mixture is less (moisture content is high), the aperture of control valve diminishes, the oil mixing with water flow quantity entering base tube 111 reduces.Each Intelligent water-controlled short circuit 11 according to the oil-water mixture moisture content flow automatic regulation relatively controlling water section, thus reaches the object of segmentation packing, intelligent control water.
As shown in Figure 3, the difference that the utility model screen casing completes oil well intelligent water control pipe post the second embodiment and a upper embodiment is only that applied oil well is straight well, and the some control water sections between oil well wellbore formation and oil pipe column 1 are along the directional spreding of straight well.In addition, in order to prevent the sand grains blocking sieve aperture of screen casing 5 in oil well well and screen cloth 113, can also between screen casing 5 and wellbore formation pack gravel.
Above-described embodiment is only be described preferred embodiment of the present utility model; not scope of the present utility model is limited; under the prerequisite not departing from the utility model design spirit; the various distortion that those of ordinary skill in the art make the technical solution of the utility model and improvement, all should fall in protection domain that the utility model claims determine.
Claims (6)
1. a screen casing completes oil well intelligent water control pipe post, it is characterized in that: comprise oil pipe column (1), hanging packer (2), packer (3) in some pipes, some external packer of pipe (6) and some Intelligent water-controlled short circuits (11), described oil pipe column (1) hangs the lower end being fixed on upper strata sleeve pipe (4) by hanging packer (2), oil pipe column (1) is positioned at screen casing (5), some external packer of pipe (6) are arranged at intervals with between the outer wall of described screen casing (5) and oil well wellbore formation, described external packer of pipe (6) contacts with wellbore formation and seals, in described some pipes, packer (3) interval is connected on oil pipe column (1), in pipe, packer (3) seals with the contact internal walls of screen casing (5), and packer (3) and external packer of pipe (6) one_to_one corresponding are arranged on the inside and outside both sides of screen casing (5) in pipe, in adjacent two couples pipe, packer (3) and external packer of pipe (6) will be separated into some control water sections between oil pipe column (1) and oil well wellbore formation, described oil pipe column (1) comprises some oil pipes (12), described Intelligent water-controlled short circuit (11) is alternately connected successively with oil pipe (12), each Intelligent water-controlled short circuit (11) is positioned between two adjacent pipes packer (3), corresponding with the control water section in screen casing (5), Intelligent water-controlled short circuit (11) comprises base tube (111), self-regulation flow control valve (112) and screen cloth (113), the two ends of described base tube (111) are connected with oil pipe (12) respectively, the circumferential tube wall of base tube (111) offers some valve installing holes, self-regulation flow control valve (112) is installed in each valve installing hole, it is outside that described screen cloth (113) is fixedly mounted on base tube (111), filtrate runner (114) is formed between screen cloth (113) and base tube (111), described filtrate runner (114) is connected with the inlet of self-regulation flow control valve (112).
2. screen casing according to claim 1 completes oil well intelligent water control pipe post, it is characterized in that: in described pipe packer (3) be mechanical packer, hydraulic packer or meet oil/water inflatable packer, described external packer of pipe (6) is chemical packer.
3. screen casing according to claim 1 completes oil well intelligent water control pipe post, it is characterized in that: it is outside that described screen cloth (113) covers self-regulation flow control valve (112), the two ends of screen cloth (113) are fixedly connected with by retainer ring (115) with between base tube (111).
4. screen casing according to claim 1 completes oil well intelligent water control pipe post, it is characterized in that: described oil pipe column (1) bottom is provided with guide shoe (15).
5. screen casing according to claim 1 completes oil well intelligent water control pipe post, it is characterized in that: described oil well is horizontal well or straight well.
6. screen casing according to claim 1 completes oil well intelligent water control pipe post, it is characterized in that: be filled with gravel between described screen casing (5) and oil well wellbore formation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420768689.8U CN204283379U (en) | 2014-12-08 | 2014-12-08 | Screen casing completes oil well intelligent water control pipe post |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420768689.8U CN204283379U (en) | 2014-12-08 | 2014-12-08 | Screen casing completes oil well intelligent water control pipe post |
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| CN204283379U true CN204283379U (en) | 2015-04-22 |
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| CN201420768689.8U Expired - Fee Related CN204283379U (en) | 2014-12-08 | 2014-12-08 | Screen casing completes oil well intelligent water control pipe post |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105863588A (en) * | 2016-04-28 | 2016-08-17 | 重庆科技学院 | Balanced injection and recovery method of thickened oil thermal recovery horizontal well |
| CN106150433A (en) * | 2016-08-21 | 2016-11-23 | 中国石油化工股份有限公司 | A kind of downhole intelligent balanced production control valve |
| CN106401540A (en) * | 2015-07-21 | 2017-02-15 | 思达斯易能源技术(集团)有限公司 | Segmented oil-stabilizing water-controlling method and device |
| CN106677747A (en) * | 2017-01-19 | 2017-05-17 | 长江大学 | Filling type water control screen pipe used for sand prevention of horizontal well completion |
| CN108266173A (en) * | 2018-01-22 | 2018-07-10 | 中国石油化工股份有限公司 | A kind of method for being segmented transformation completion |
| CN109138939A (en) * | 2018-10-24 | 2019-01-04 | 四川理工学院 | A kind of cyclone-type inflow control valve |
| CN109138932A (en) * | 2017-06-28 | 2019-01-04 | 中国石油化工股份有限公司 | A kind of chemical packer segmentation control water completion method of straight well filling combination |
| CN109138937A (en) * | 2017-06-28 | 2019-01-04 | 中国石油化工股份有限公司 | Secondary stratification control water completion method for former sieve tube completion |
| CN110017127A (en) * | 2018-01-08 | 2019-07-16 | 中国石油化工股份有限公司 | The water integrated device of acid fracturing control, acid fracturing water control pipe column and acid fracturing water control method |
| CN111022005A (en) * | 2018-10-10 | 2020-04-17 | 中国石油化工股份有限公司 | Variable flow channel type inflow control device, oil extraction nipple and production pipe string |
| CN111271050A (en) * | 2020-01-23 | 2020-06-12 | 中国海洋石油集团有限公司 | Horizontal well AICD intelligent water control sieve tube performance testing method |
| CN111535777A (en) * | 2020-06-16 | 2020-08-14 | 中国石油集团渤海钻探工程有限公司 | Sand-prevention water-control fixed-point squeeze-injection pipe column and application method thereof |
| CN111622707A (en) * | 2020-06-11 | 2020-09-04 | 中国石油集团渤海钻探工程有限公司 | Balanced injection and balanced oil extraction integrated injection-production string |
| CN112360387A (en) * | 2020-12-08 | 2021-02-12 | 中国石油天然气股份有限公司 | Balanced production water control pipe column and method for casing completion horizontal well |
| CN112647889A (en) * | 2019-10-12 | 2021-04-13 | 中国石油化工股份有限公司 | Self-adaptive flow control water device and design method thereof |
| CN113494277A (en) * | 2020-03-19 | 2021-10-12 | 中国海洋石油集团有限公司 | Refined segmented water control well completion structure of horizontal well |
-
2014
- 2014-12-08 CN CN201420768689.8U patent/CN204283379U/en not_active Expired - Fee Related
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106401540A (en) * | 2015-07-21 | 2017-02-15 | 思达斯易能源技术(集团)有限公司 | Segmented oil-stabilizing water-controlling method and device |
| CN105863588A (en) * | 2016-04-28 | 2016-08-17 | 重庆科技学院 | Balanced injection and recovery method of thickened oil thermal recovery horizontal well |
| CN106150433A (en) * | 2016-08-21 | 2016-11-23 | 中国石油化工股份有限公司 | A kind of downhole intelligent balanced production control valve |
| CN106677747A (en) * | 2017-01-19 | 2017-05-17 | 长江大学 | Filling type water control screen pipe used for sand prevention of horizontal well completion |
| CN109138937A (en) * | 2017-06-28 | 2019-01-04 | 中国石油化工股份有限公司 | Secondary stratification control water completion method for former sieve tube completion |
| CN109138932A (en) * | 2017-06-28 | 2019-01-04 | 中国石油化工股份有限公司 | A kind of chemical packer segmentation control water completion method of straight well filling combination |
| CN110017127A (en) * | 2018-01-08 | 2019-07-16 | 中国石油化工股份有限公司 | The water integrated device of acid fracturing control, acid fracturing water control pipe column and acid fracturing water control method |
| CN108266173A (en) * | 2018-01-22 | 2018-07-10 | 中国石油化工股份有限公司 | A kind of method for being segmented transformation completion |
| CN108266173B (en) * | 2018-01-22 | 2020-12-11 | 中国石油化工股份有限公司 | Method for segmented reconstruction of well completion |
| CN111022005A (en) * | 2018-10-10 | 2020-04-17 | 中国石油化工股份有限公司 | Variable flow channel type inflow control device, oil extraction nipple and production pipe string |
| CN109138939A (en) * | 2018-10-24 | 2019-01-04 | 四川理工学院 | A kind of cyclone-type inflow control valve |
| CN112647889A (en) * | 2019-10-12 | 2021-04-13 | 中国石油化工股份有限公司 | Self-adaptive flow control water device and design method thereof |
| CN112647889B (en) * | 2019-10-12 | 2022-11-25 | 中国石油化工股份有限公司 | Self-adaptive flow control water device and design method thereof |
| CN111271050A (en) * | 2020-01-23 | 2020-06-12 | 中国海洋石油集团有限公司 | Horizontal well AICD intelligent water control sieve tube performance testing method |
| CN113494277A (en) * | 2020-03-19 | 2021-10-12 | 中国海洋石油集团有限公司 | Refined segmented water control well completion structure of horizontal well |
| CN111622707A (en) * | 2020-06-11 | 2020-09-04 | 中国石油集团渤海钻探工程有限公司 | Balanced injection and balanced oil extraction integrated injection-production string |
| CN111535777A (en) * | 2020-06-16 | 2020-08-14 | 中国石油集团渤海钻探工程有限公司 | Sand-prevention water-control fixed-point squeeze-injection pipe column and application method thereof |
| CN112360387A (en) * | 2020-12-08 | 2021-02-12 | 中国石油天然气股份有限公司 | Balanced production water control pipe column and method for casing completion horizontal well |
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Owner name: ZHONGTONG (BEIJING) ENERGY TECHNOLOGY CO., LTD. Free format text: FORMER NAME: ZHONGTONG (BEIJING) ENERGY TECHNOLOGY LTD. |
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Address after: 100102 Wangjing West Road, Beijing, No. 1, No. Patentee after: ZONTON (BEIJING) ENERGY TECHNOLOGY CO.,LTD. Address before: 100102 Wangjing West Road, Beijing, No. 1, No. Patentee before: ZONTON (BEIJING) ENERGY TECHNOLOGY CO.,LTD. |
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| CP01 | Change in the name or title of a patent holder |
Address after: 100102 Wangjing West Road, Beijing, No. 1, No. Patentee after: ZHONGLI TONGYUAN PETROLEUM NATURAL GAS ENGINEERING TECHNOLOGY CO.,LTD. Address before: 100102 Wangjing West Road, Beijing, No. 1, No. Patentee before: ZONTON (BEIJING) ENERGY TECHNOLOGY CO.,LTD. |
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Effective date of registration: 20170203 Address after: 100080 Haidian Haidian District street, No. 3, building 20, room 1801-A2018-19, level 1, Patentee after: BEIJING GUOTAI TONGYUAN TECHNOLOGY CO.,LTD. Address before: 100102 Wangjing West Road, Beijing, No. 1, No. Patentee before: ZHONGLI TONGYUAN PETROLEUM NATURAL GAS ENGINEERING TECHNOLOGY CO.,LTD. |
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