CN104399716A - Method for releasing blockage of hydrate in oil and gas conveying pipeline - Google Patents
Method for releasing blockage of hydrate in oil and gas conveying pipeline Download PDFInfo
- Publication number
- CN104399716A CN104399716A CN201410510346.6A CN201410510346A CN104399716A CN 104399716 A CN104399716 A CN 104399716A CN 201410510346 A CN201410510346 A CN 201410510346A CN 104399716 A CN104399716 A CN 104399716A
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- hydrate
- pipe
- line
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- pressure
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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
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B2209/00—Details of machines or methods for cleaning hollow articles
- B08B2209/02—Details of apparatuses or methods for cleaning pipes or tubes
- B08B2209/027—Details of apparatuses or methods for cleaning pipes or tubes for cleaning the internal surfaces
Abstract
The invention discloses a method for releasing blockage of hydrate in an oil and gas conveying pipeline. The method comprises the following steps: the two ends of a hydrate blockage segment in the oil and gas conveying pipeline are communicated with a gas and liquid recycling tank through rapid joints, then pressure reduction is carried out on the two ends of the hydrate blockage segment in the oil and gas conveying pipeline, and pressure in the two ends of the hydrate blockage segment is kept balanced; communication between the rapid joints and communication between the gas and liquid recycling tank and the rapid joints are switched off, hydrate inhibitors and/or high-temperature material flows are injected into the hydrate blockage segment, and the hydrate in the oil and gas conveying pipe is decomposed. The method has the beneficial effects that the operation utilizing the hydrate for treating sledging and unblocking is easy, and blockage caused by generation of the solid hydrate in the oil and gas conveying pipeline on the sea can be effectively released; and the independent pressure reduction unblocking method can be adopted, or a pressure reduction and heat agent injecting/injection heat integration unblocking method is adopted, and the method is used for releasing the blockage caused by the solid hydrate in the oil and gas conveying pipeline.
Description
Technical field
The present invention relates to a kind of method removing Hydrate Plugging in pipe-line, belong to production of hydrocarbons technical field.
Background technology
Along with the continuous increase of offshore oil and gas field Exploitation Depth, the laying degree of depth of submerged pipeline and length also constantly increase.The severe natural environment of deep water not only proposes harsh requirement to deepwater floating platform, subsea production system, operation on the sea etc., also give and run and be operated between each satellite well of connection, marginal oil field and central processing system, bring acid test from the submerged pipeline of several kilometers, tens kilometers and even several hundred kilometers there.Data from Oil Field shows: due to the cold environmental conditions of deep water, very easily solid hydrate is generated in deep water hydrocarbon multiphase pipeline, cause the blocking of conveyance conduit, serious threat is to the safe operation of subsea production system and mixed transporting tube line, and then normally carrying out of producing of impact.Meanwhile, tundra by land, because temperature is lower, particularly in winter, is also easy in oil gas pipeline generate hydrate thus result in blockage.
Although generate the problem of solid water compound for pipe-line, researcher proposes and injects the method that the thermodynamic inhibitor such as methyl alcohol, ethylene glycol prevents from generating hydrate, but data shows, deep water hydrocarbon field substantially all ran in pipe-line the problem generating hydrate and result in blockage.And Hydrate Plugging is once occur, its de-plugging situation is very complicated, if control improper, easily causes substantial spoilage to oil gas conveying device.Therefore, the de-plugging problem of hydrate in pipe-line, become the focus in the exploitation of deep water hydrocarbon field and operational management and difficult point, famous sea God's plan, PROCAP etc. are all bar none using the core tackling key problem technology of Hydrate Plugging problem as deep water flowing safeguard technology.
At present, although the research of external hydrate de-plugging problem makes some progress, because deepwater environment is severe, this problem is not still well solved, and the research and development of relevant device and method for removing blockage are still in the starting stage.And deepwater development has just been brought into schedule by China, along with deep-sea is moved towards in China's marine petroleum development, hydrate de-plugging problem by be we must faced by new challenge, thus application hydrate administers the technical study that sledge solves solid hydrate blocking in pipe-line, has important practical significance.
Summary of the invention
The object of this invention is to provide a kind of method removing Hydrate Plugging in pipe-line, the method that the method adopts independent step-down solution to block, or adopt step-down and heat injection agent/heat injection to combine the method for separating blocking, for removing the blocking caused due to solid water compound in pipe-line.
In releasing pipe-line provided by the invention, the method for Hydrate Plugging, comprises the steps:
Step-down is carried out at Hydrate Plugging section two ends in pipe-line, and keeps the pressure balance at described Hydrate Plugging section two ends, then the hydrate in pipe-line decomposes.
Above-mentioned method, carries out step-down by being connected with gas-liquid recycling can respectively at described Hydrate Plugging section two ends; And described in the pipeline that is connected be provided with snap joint.
Above-mentioned method, before the described logistics of reception, is filled with inert gas in described gas-liquid recycling can, and the little 0.5 ~ 2MPa of pressure in its pressure ratio pipe-line.
Above-mentioned method, arranged check valve before described gas-liquid recycling can, ensured that gas-liquid can only flow to recycling can from pipe-line.
Above-mentioned method, cut off connection between described snap joint and described gas-liquid recycling can and being communicated with between described snap joint, in pipe-line, Hydrate Plugging section injects hydrate inhibitor and/or high temperature logistics.
Above-mentioned method, described hydrate inhibitor can be methanol aqueous solution, glycol water or salt solution.
Described high temperature logistics can be water, methanol aqueous solution, glycol water or salt solution, and the temperature of described high temperature logistics is greater than the temperature corresponding to equalizing pressure of hydrate in pipe-line, and temperature difference is at least 5 DEG C.
Above-mentioned method, when monitoring pressure in connecting pipeline and being increased to the equalizing pressure of hydrate in pipe-line, stops Hydrate Plugging section in described pipe-line to inject described hydrate inhibitor for natural gas and/or high temperature logistics;
The hydrate phase balance pressure that the equalizing pressure of described hydrate is corresponding under referring to the temperature in oil and gas pipes.
Above-mentioned method, 0.05MPa/min is less than when monitoring the rate of pressure rise in described connecting pipeline, or time constant, be communicated with described gas-liquid recycling can and described snap joint, to make the pressure in described connecting pipeline reduce, and 0.5 ~ 2Mpa of equalizing pressure lower than hydrate in pipe-line;
Pressure in described connecting pipeline reduces simultaneously, open the valve that pipeline that described gas-liquid recycling can is connected with 2 described snap joints is provided with, keep the pressure balance at Hydrate Plugging section two ends in pipe-line, guarantee that solid water compound can not be moved because two ends exist pressure reduction in the duct.
Utilize hydrate to administer sledge in the present invention and remove the method blocked in transportation pipe, in land construction process, hydrate is administered sledge and is connected with pipe-line; In offshore construction process, hydrate is administered sledge and hang lower water by the loop wheel machine on workboat deck, be discharged into need block clearing pipeline near carry out work, the hydrate that workboat is connected under water by umbilical cables administers sledge, umbilical cables provides 380V electrical source of power, 220V TT&C system power supply and Optical Fiber Transmission measurement and control signal, described control system is positioned on ship for the reception of measurement data and the transmission of operational order, when the temperature received, pressure data reach setting value, can ON/OFF respective valves as required.
Compared with prior art, the present invention has the following advantages:
(1) the inventive method utilizes hydrate to administer the simple to operate of sledge de-plugging, effectively can remove the blocking caused owing to generating solid water compound in offshore oil and gas conveyance conduit.
(2) the inventive method can adopt the method that independent step-down solution blocks, or adopts step-down and heat injection agent/heat injection to combine the method for separating blocking, for removing the blocking caused due to solid water compound in pipe-line.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet that the inventive method removes gas hydrates blocking in pipe-line.
Detailed description of the invention
The experimental technique used in following embodiment if no special instructions, is conventional method.
Material used in following embodiment, reagent etc., if no special instructions, all can obtain from commercial channels.
The method of gas hydrates blocking in embodiment 1, releasing pipe-line
According to the flow chart shown in Fig. 1, the blocking that the gas hydrates in pipe-line cause is removed.
In offshore construction process, hydrate is administered sledge and hangs lower water by the loop wheel machine on workboat deck, be discharged into need block clearing pipeline near carry out work.The hydrate that workboat is connected under water by umbilical cables administers sledge, umbilical cables provides 380V electrical source of power, 220V TT&C system power supply and Optical Fiber Transmission measurement and control signal, control system is positioned on ship for the reception of measurement data and the transmission of operational order, when the temperature received, pressure data reach setting value, can ON/OFF respective valves as required.Concrete steps are as follows:
(1) by gas hydrates blocking section two ends and snap joint snapping in pipe-line, and snap joint is connected with gas-liquid recycling can.
(2) valve 3, valve 4, valve 5 and check valve is opened, make gas-liquid recycling can, snap joint is communicated with pipe-line, and be communicated with 2 snap joints, now, pressure drop in pipe-line, hydrate then in pipe-line decomposes, the logistics after decomposition release to gas-liquid recycling can (reception logistics before, be filled with inert gas N in gas-liquid recycling can
2, and the little 0.5-2.0MPa of pressure in its pressure ratio pipe-line) in, to reduce the pressure in pipe-line; While in pipe-line, pressure reduces, open valve 1 and valve 2, be communicated with Hydrate Plugging section, to guarantee the pressure balance at Hydrate Plugging section two ends in pipe-line, ensure that solid water compound can not be moved because two ends exist pressure reduction in the duct.
(3) valve-off 1, valve 2, valve 5 and check valve after logistics of releasing, cut off connection between snap joint and gas-liquid recycling can and being communicated with between snap joint; Then open valve 6, inject hydrate inhibitor methanol solution from capsule-type storage tank to Hydrate Plugging section pipe-line by fluid clutch.
Pressure in the pipe-line that pressure sensor records is sent to control system, when monitoring pressure in connecting pipeline and be increased to equalizing pressure (the gas hydrates equalizing pressure 3.8MPa that the temperature 4.0 DEG C in the pipe-line that the temperature sensor that control system detects records is corresponding) of hydrate in pipe-line, Hydrate Plugging section in pipe-line is stopped to inject hydrate inhibitor methanol solution;
0.05MPa/min is less than when monitoring the rate of pressure rise in connecting pipeline, valve-off 6, open valve 1 and valve 2, when monitoring that in pipeline, pressure remains unchanged simultaneously, open valve 5 and check valve, be communicated with gas-liquid recycling can and snap joint, in gas-liquid recycling can, earial drainage reduces to make the pressure in connecting pipeline, and the 3.8Mpa of equalizing pressure lower than hydrate in pipe-line; Release pressure 3.0MPa higher than Pressure gauge setting on gas-liquid recycling can of pressure in logistics progress time, valve-off 5, opens valve 7, logistics in release gas-liquid recycling can; When pressure is reduced to 0.5 ~ 2Mpa, valve-off 7, opens valve 5, continues to receive the logistics of releasing in oil gas pipeline.
Pipe-line changes as follows by the phenomenon blocked to de-plugging:
When pipe-line blocks, recorded by differential manometer preassembled on pipe-line and flowmeter, the pressure differential of the upstream and downstream of blocking section oil and gas pipes can increase, and while blocking section oil and gas pipes, the flow velocity of downstream oil can reduce until do not have oily flow gradually; When after pipe-line de-plugging, the upstream and downstream pressure differential that differential manometer and flowmeter record blocking section oil and gas pipes diminishes, and oily flow recovers normal.
Be cycled to repeat step-down in above-mentioned pipe-line, add heat injection agent decomposition water compound and logistics pressure reduction of releasing, until blocking is removed in pipe-line, valve-off 1, valve 2, valve 3 and valve 4, snap joint is taken off from pipe-line.
Claims (8)
1. remove a method for Hydrate Plugging in pipe-line, comprise the steps:
Step-down is carried out at Hydrate Plugging section two ends in pipe-line, and keeps the pressure balance at described Hydrate Plugging section two ends, then the hydrate in pipe-line decomposes.
2. method according to claim 1, is characterized in that: carry out step-down by being connected with gas-liquid recycling can respectively at described Hydrate Plugging section two ends; And described in the pipeline that is connected be provided with snap joint.
3. method according to claim 2, is characterized in that: be filled with inert gas in described gas-liquid recycling can, and the little 0.5 ~ 2MPa of pressure in its pressure ratio pipe-line.
4. according to the method in claim 2 or 3, it is characterized in that: before described gas-liquid recycling can, check valve is set.
5. the method according to any one of claim 2-4, it is characterized in that: cut off connection between described snap joint and described gas-liquid recycling can and being communicated with between described snap joint, in pipe-line, Hydrate Plugging section injects hydrate inhibitor and/or high temperature logistics.
6. method according to claim 5, is characterized in that: described hydrate inhibitor is methanol aqueous solution, glycol water or salt solution;
Described high temperature logistics is water, methanol aqueous solution, glycol water or salt solution, and the temperature of described high temperature logistics is greater than the temperature corresponding to equalizing pressure of hydrate in pipe-line, and temperature difference is at least 5 DEG C.
7. the method according to claim 5 or 6, it is characterized in that: when monitoring pressure in connecting pipeline and being increased to the equalizing pressure of hydrate in pipe-line, stop Hydrate Plugging section in described pipe-line to inject described hydrate inhibitor for natural gas and/or high temperature logistics.
8. method according to claim 7, it is characterized in that: be less than 0.05MPa/min when monitoring the rate of pressure rise in described connecting pipeline, or time constant, be communicated with described gas-liquid recycling can and described snap joint, to make the pressure in described connecting pipeline reduce, and 0.5 ~ 2MPa of equalizing pressure lower than hydrate in pipe-line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410510346.6A CN104399716B (en) | 2014-09-28 | Release the method for Hydrate Plugging in pipe-line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410510346.6A CN104399716B (en) | 2014-09-28 | Release the method for Hydrate Plugging in pipe-line |
Publications (2)
| Publication Number | Publication Date |
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| CN104399716A true CN104399716A (en) | 2015-03-11 |
| CN104399716B CN104399716B (en) | 2017-01-04 |
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Cited By (9)
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| CN104848034A (en) * | 2015-05-08 | 2015-08-19 | 中国海洋石油总公司 | Method for simulating generation, blockage and blockage relieving of solid hydrate in oil gas conveying pipeline |
| CN105443988A (en) * | 2015-11-13 | 2016-03-30 | 海洋石油工程股份有限公司 | Blockage relieving method for natural gas hydrate blocking in oil-gas mixing transportation pipeline |
| CN105696981A (en) * | 2016-04-14 | 2016-06-22 | 深圳市雷斯特海洋工程有限公司 | Device, system and method for blocking removal of flammable ice |
| CN106322121A (en) * | 2016-08-26 | 2017-01-11 | 中国石油大学(华东) | Early monitoring device and method for hydrate blockage of deep water gas well production pipeline |
| CN109736758A (en) * | 2019-01-10 | 2019-05-10 | 中国地质大学（武汉） | A kind of instrument and method releasing hydrate in condensate gas well back pressure pipeline |
| CN111075397A (en) * | 2019-12-30 | 2020-04-28 | 南京惟真智能管网科技研究院有限公司 | Hydrate blockage removing method |
| CN111287706A (en) * | 2020-02-14 | 2020-06-16 | 中国海洋石油集团有限公司 | Deepwater oil and gas field underwater facility and hydrate blockage removing method thereof |
| CN112916544A (en) * | 2019-12-06 | 2021-06-08 | 中国石油天然气股份有限公司 | Blockage removing device and blockage removing method for condensate cylinder |
| CN115864286A (en) * | 2022-12-30 | 2023-03-28 | 中天科技海缆股份有限公司 | Dynamic submarine cable anchoring device and dynamic submarine cable system |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104848034A (en) * | 2015-05-08 | 2015-08-19 | 中国海洋石油总公司 | Method for simulating generation, blockage and blockage relieving of solid hydrate in oil gas conveying pipeline |
| CN105443988A (en) * | 2015-11-13 | 2016-03-30 | 海洋石油工程股份有限公司 | Blockage relieving method for natural gas hydrate blocking in oil-gas mixing transportation pipeline |
| CN105443988B (en) * | 2015-11-13 | 2017-12-01 | 海洋石油工程股份有限公司 | Gas hydrates block method for removing blockage in a kind of multiphase transportation pipeline |
| CN105696981A (en) * | 2016-04-14 | 2016-06-22 | 深圳市雷斯特海洋工程有限公司 | Device, system and method for blocking removal of flammable ice |
| CN106322121A (en) * | 2016-08-26 | 2017-01-11 | 中国石油大学(华东) | Early monitoring device and method for hydrate blockage of deep water gas well production pipeline |
| CN106322121B (en) * | 2016-08-26 | 2018-04-06 | 中国石油大学(华东) | Deep water gas well liquid loading pipeline Hydrate Plugging early monitoring device and method |
| CN109736758A (en) * | 2019-01-10 | 2019-05-10 | 中国地质大学（武汉） | A kind of instrument and method releasing hydrate in condensate gas well back pressure pipeline |
| CN112916544A (en) * | 2019-12-06 | 2021-06-08 | 中国石油天然气股份有限公司 | Blockage removing device and blockage removing method for condensate cylinder |
| CN112916544B (en) * | 2019-12-06 | 2022-07-05 | 中国石油天然气股份有限公司 | Blockage removing device and blockage removing method for condensate cylinder |
| CN111075397A (en) * | 2019-12-30 | 2020-04-28 | 南京惟真智能管网科技研究院有限公司 | Hydrate blockage removing method |
| CN111075397B (en) * | 2019-12-30 | 2024-02-13 | 南京惟真智能管网科技研究院有限公司 | Hydrate blocking and unblocking method |
| CN111287706A (en) * | 2020-02-14 | 2020-06-16 | 中国海洋石油集团有限公司 | Deepwater oil and gas field underwater facility and hydrate blockage removing method thereof |
| CN115864286A (en) * | 2022-12-30 | 2023-03-28 | 中天科技海缆股份有限公司 | Dynamic submarine cable anchoring device and dynamic submarine cable system |
| CN115864286B (en) * | 2022-12-30 | 2023-11-21 | 中天科技海缆股份有限公司 | Dynamic submarine cable anchoring device and dynamic submarine cable system |
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Address after: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee after: CNOOC research institute limited liability company Patentee after: China Offshore Oil Group Co., Ltd. Co-patentee after: CNOOC Energy Development Co., Ltd. Co-patentee after: NEPTUNE OFFSHORE ENGINEERING DEVELOPMENT CO., LTD. Address before: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee before: CNOOC Research Institute Patentee before: China National Offshore Oil Corporation Co-patentee before: CNOOC Energy Development Co., Ltd. Co-patentee before: NEPTUNE OFFSHORE ENGINEERING DEVELOPMENT CO., LTD. |
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Effective date of registration: 20200918 Address after: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Patentee after: CHINA NATIONAL OFFSHORE OIL Corp. Patentee after: CNOOC RESEARCH INSTITUTE Co.,Ltd. Address before: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Patentee before: CHINA NATIONAL OFFSHORE OIL Corp. Patentee before: CNOOC RESEARCH INSTITUTE Co.,Ltd. Patentee before: CNOOC ENERGY TECHNOLOGY & SERVICES Ltd. Patentee before: NEPTUNE OFFSHORE ENGINEERING DEVELOPMENT Co.,Ltd. |