CN103453318A - Storage and conveying method for offshore platform lean glycol - Google Patents
Storage and conveying method for offshore platform lean glycol Download PDFInfo
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- CN103453318A CN103453318A CN2013103974699A CN201310397469A CN103453318A CN 103453318 A CN103453318 A CN 103453318A CN 2013103974699 A CN2013103974699 A CN 2013103974699A CN 201310397469 A CN201310397469 A CN 201310397469A CN 103453318 A CN103453318 A CN 103453318A
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Abstract
The invention discloses a storage and conveying method for offshore platform lean glycol. The method comprises the following steps: (1) storing the lean glycol by taking jacket legs of an offshore platform as lean glycol storage tanks; (2) filling inert gas into the jacket legs to pressurize, and conveying the lean glycol to a lean glycol daily tank by using pressure difference between the interior of the jacket legs and the lean glycol daily tank to realize conveying of the lean glycol. According to the method, the lean glycol is stored by using the jacket legs, so that the arrangement of a large-sized storage tank on an upper block of the offshore platform can be avoided to save the platform space and optimize the equipment layout of an upper deck. According to the method, the using amount of steel of the jacket legs is reduced, the lifting weight of the upper block of the platform is reduced, the difficulty for fire safety and the production operation safety risk are reduced, and the engineering investment is saved.
Description
Technical field
The present invention relates to a kind of storage and delivery method of offshore platform lean glycol.
Background technique
In gas field development, rock gas in the transfer line of seabed and free water can form hydrate under uniform temperature and pressure, the generation of hydrate can reduce pipeline transmission capacity, improve production and operation cost, understand the equipment such as blocking pipeline valve when serious, even line fracture can occur, be a key factor that threatens normal production and gas pipeline safe operation.Ethylene glycol is nontoxic with it, and high than the methyl alcohol boiling point, evaporation loss is little, the recyclable characteristics such as reuse, and the Chang Zuowei hydrate inhibitor is used in gas exploitation.
In construction of natural gas fields project in the past, because the depth of water is more shallow, the submerged pipeline fed distance is shorter, the disposable consumption of lean glycol (being that mass fraction is at the Glycol Mixture more than 80%) is little, storage tank is set usually on platform, and the form that supply vessel supply in time supplements ethylene glycol meets Production requirement.For the large-sized deep water gas field, because its depth of water is darker, the seabed water temperature is lower, and the pipeline fed distance is longer, therefore, larger to the demand of lean glycol.When submerged pipeline segment occurred plug flow is held liquid, moisture rich ethylene glycol can't be got back to the platform regenerative cycle and use in a period of time, but now lean glycol still needs to be sent to continuously the submerged pipeline entrance, in order to guarantee safety and stability production, need on platform, store a large amount of lean glycols.Take 3-1 gas field, Li Gulf is example, meets the consumption of producing required lean glycol up to 1500m
3if, store lean glycol with platform storage tank form, will make the platform construction expense significantly improve, and greatly increase platform device layout and safety fire fighting difficulty.
Summary of the invention
The storage and the delivery method that the purpose of this invention is to provide a kind of offshore platform lean glycol, the device layout that method of the present invention can Optimization Platform, reduce the platform area, alleviates the weight of platform upper module, reduces production hidden danger, reduces and build cost of investment.
The storage of a kind of offshore platform lean glycol provided by the present invention and delivery method, comprise the steps:
(1) the jacket leg that adopts offshore platform, as the lean glycol storage tank, is realized the storage to lean glycol;
(2) to being filled with inert gas in described jacket leg, pressurizeed, utilize in described jacket leg with the lean glycol working tank between pressure difference lean glycol is delivered in described lean glycol working tank, the conveying of realization to lean glycol.
In above-mentioned storage and delivery method, by the suction line of the lean glycol on described jacket leg and the flow difference of the flowmeter on outlet line, realize the control to the liquid level of the lean glycol in described jacket leg.
In above-mentioned storage and delivery method, described inert gas can be nitrogen.
In above-mentioned storage and delivery method, on the suction line of the lean glycol on described jacket leg and outlet line, be equipped with the lean glycol filter.
In method provided by the invention, the middle and upper part of the suction line of the lean glycol on described jacket leg is close to jacket leg inwall and is fixed, and center region in the jacket leg is stretched in bottom, and the suction line bottom position is apart from the about 2m of container bottom, pipeline is made as two, the using and the reserved.
In method provided by the invention, when normal storage, jacket leg internal pressure is normal pressure, processing qualified lean glycol from glycol recycling reclaiming system on supply vessel or process platform first concentrates to a jacket leg conveying, until switch to another jacket leg after being filled in this jacket leg again;
In course of conveying, the lean glycol in the jacket leg switches to another jacket leg and carries out the conveying of lean glycol while reaching minimum liquid level.
The present invention has following advantage:
The present invention utilizes the jacket leg to store lean glycol, can avoid platform upper chunk at sea that large-scale storage tank is set, thereby save platform space, and the device layout of upper deck is optimized; Method of the present invention has reduced the jacket steel using amount, has alleviated the lifting weight of platform upper chunk; Method of the present invention has reduced difficulty and the production operation security risk of security against fire; Saved construction investment.
The accompanying drawing explanation
The storage that Fig. 1 is offshore platform lean glycol of the present invention and the flow chart of delivery method.
Embodiment
The experimental technique used in following embodiment if no special instructions, is conventional method.
In following embodiment, material used, reagent etc., if no special instructions, all can obtain from commercial channels.
As shown in Figure 1, be the storage of offshore platform lean glycol of the present invention and the flow chart of delivery method.
1, daily storage
(1) enable 4 the jacket legs in the platform outside as the lean glycol storage tank, the about 500m in the storage area of single jacket leg
3, lean glycol outlet line valve (being egress filtering device valve), in closed condition, keeps normal pressure, nitrogen-sealed in the jacket leg.
(2) when on needs receive from supply vessel or process platform, the glycol recycling reclaiming system is processed qualified lean glycol, select the minimum jacket leg of liquid level, open lean glycol inlet/outlet pipeline valve and receive lean glycol, when liquid level reaches in limited time, be manually switched to another jacket leg and adopt identical method to receive lean glycol.
2, lean glycol is carried
(1) when needs are carried lean glycol to platform lean glycol working tank, select the highest jacket leg of liquid level, manual-lock lean glycol suction line valve (being the inlet filter valve), manual unlocking lean glycol outlet line valve (being egress filtering device valve), in guide pipe support leg, be filled with in advance the nitrogen pressurization, utilize in the jacket leg and the pressure difference between the lean glycol working tank is delivered to lean glycol in platform lean glycol working tank.The highest pressurising of nitrogen is 1500kPaG.
(2) after the liquid level in the lean glycol working tank reaches the upper limit, cut off the nitrogen source, manual-lock lean glycol outlet line valve, shed the interior pressure of jacket leg to normal pressure, manual unlocking lean glycol suction line valve.
(3) liquid level in jacket leg during lean glycol is carried reaches in limited time lower, and manual switchover is the highest jacket leg of current liquid level extremely, repeats the operation of above-mentioned steps (1) and (2).To reaching the jacket leg of liquid level lower limit, cut off the nitrogen source, manual-lock lean glycol outlet line valve, shed the interior pressure of jacket leg to normal pressure, manual unlocking lean glycol suction line valve.
Claims (4)
1. the storage of an offshore platform lean glycol and delivery method, comprise the steps:
(1) the jacket leg that adopts offshore platform, as the lean glycol storage tank, is realized the storage to lean glycol;
(2) to being filled with inert gas in described jacket leg, pressurizeed, utilize in described jacket leg with the lean glycol working tank between pressure difference lean glycol is delivered in described lean glycol working tank, the conveying of realization to lean glycol.
2. storage according to claim 1 and delivery method, is characterized in that: by the suction line of the lean glycol on described jacket leg and the flow difference of the flowmeter on outlet line, realize the control to the liquid level of the lean glycol in described jacket leg.
3. storage according to claim 1 and 2 and delivery method, it is characterized in that: described inert gas is nitrogen.
4. according to the described storage of any one and delivery method in claim 1-3, it is characterized in that: on the suction line of the lean glycol on described jacket leg and outlet line, be equipped with the lean glycol filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310397469.9A CN103453318B (en) | 2013-09-04 | 2013-09-04 | The storage of offshore platform lean glycol and delivery method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310397469.9A CN103453318B (en) | 2013-09-04 | 2013-09-04 | The storage of offshore platform lean glycol and delivery method |
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| CN103453318A true CN103453318A (en) | 2013-12-18 |
| CN103453318B CN103453318B (en) | 2015-11-04 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101016841A (en) * | 2007-02-13 | 2007-08-15 | 中国科学院广州能源研究所 | Method for exploiting natural gas hydrates and device thereof |
| WO2009117901A1 (en) * | 2008-03-26 | 2009-10-01 | Wu Zhirong | Liquid storing and offloading device and drilling and production installations on the sea based thereon |
| CN102428244A (en) * | 2009-05-20 | 2012-04-25 | 国际壳牌研究有限公司 | Method of protecting a flexible riser and an apparatus therefor |
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2013
- 2013-09-04 CN CN201310397469.9A patent/CN103453318B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101016841A (en) * | 2007-02-13 | 2007-08-15 | 中国科学院广州能源研究所 | Method for exploiting natural gas hydrates and device thereof |
| WO2009117901A1 (en) * | 2008-03-26 | 2009-10-01 | Wu Zhirong | Liquid storing and offloading device and drilling and production installations on the sea based thereon |
| CN102428244A (en) * | 2009-05-20 | 2012-04-25 | 国际壳牌研究有限公司 | Method of protecting a flexible riser and an apparatus therefor |
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| CN103453318B (en) | 2015-11-04 |
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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. Address before: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee before: CNOOC Research Institute Patentee before: China National Offshore Oil Corporation |