CN102182414B - Deep-sea sediment core pressure-maintaining device matched with submarine drilling rig and method for using deep-sea sediment core pressure-maintaining device - Google Patents

Deep-sea sediment core pressure-maintaining device matched with submarine drilling rig and method for using deep-sea sediment core pressure-maintaining device Download PDF

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Publication number
CN102182414B
CN102182414B CN 201110056030 CN201110056030A CN102182414B CN 102182414 B CN102182414 B CN 102182414B CN 201110056030 CN201110056030 CN 201110056030 CN 201110056030 A CN201110056030 A CN 201110056030A CN 102182414 B CN102182414 B CN 102182414B
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cover
deep
drilling rod
metal hollow
sea
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CN 201110056030
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CN102182414A (en
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叶瑛
秦华伟
安莉
叶葳
陈家旺
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Zhejiang University ZJU
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Zhejiang University ZJU
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Abstract

The invention discloses a deep-sea sediment core pressure-maintaining device matched with a submarine drilling rig and a method for using the deep-sea sediment core pressure-maintaining device. The deep-sea sediment core pressure-maintaining device comprises an upper seal cover, a metal hollow drilling rod, a sampling tube and a lower seal cover, wherein the sampling tube is arranged in the metal hollow drilling rod; the metal hollow drilling rod is connected with the upper seal cover and the lower seal cover by fine threads; the upper seal cover and the lower seal cover respectively comprise an inflation valve, a top cover, a pressure shell, an expandable air cushion and O rings; the top cover and the expandable air cushion are arranged in the pressure shell; the O rings are arranged between the pressure shell and the top cover and between the pressure shell and the expandable air cushion; and the inflation valve is arranged on the top cover. The deep-sea sediment core pressure-maintaining device is matched with the submarine drilling rig, can maintain in-situ pressure in the process of extracting deep-sea sediments from a sea bed to a sea surface, and can guarantee non-loss of hydrocarbon gas such as methane gas and non-melting of a hydrate. The invention is applied to drilling and coring ocean sediments by using the submarine drilling rig and can be widely applied to exploration of ocean resources such as the hydrate and deep-sea oil and gas resources.

Description

With supporting halmeic deposit rock core pressurizer and the using method thereof of seabed rig
Technical field
The present invention relates to a kind of and supporting halmeic deposit rock core pressurizer and the using method thereof of seabed rig.
Background technology
Seabed resources being carried out to drill bit and get the final means that core is the Marine Geology exploration, is also the only resource that obtains oil in place.Boring coring is also one of important means of oceanic geotechnical investigation.Using the ODP ship to drill seabed is the major way that current marine resources are reconnoitred, but this mode is economical not.Drilling at the sea ship tonnage is large, consumes high.For the sea bottom hydrate resource investigation, and the drilling depth of oceanic geotechnical investigation generally advances tens of rice to 200 meters, the development trend of this class probing be use universal scientific investigation ship carry can the seabed AUTONOMOUS TASK under water rig drilled.For understanding in deposit whether hydrate is arranged, or the hydrocarbon seepage, usually require the halmeic deposit rock core is carried out to pressurize, rock core rises to the process on sea from seabed, make rock core keep seabed pressure constant, otherwise hydrocarbon gas can distribute with pressure decreased.Pressurize technical pattern in the past is too complicated, and own wt is large, and less as the common tonnage of scientific investigation ship of rig lash ship under water, deck space and crane weight capacity are all very limited.Existing pressurize technology is not suitable for the pressurize of drill core under water.
For the demand of using rig under water to carry out seabed resources exploration and engineering exploration, the present invention has been proposed.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of and supporting halmeic deposit rock core pressurizer and the using method thereof of seabed rig is provided.
The halmeic deposit rock core pressurizer supporting with the seabed rig comprises top cover labyrinth, metal hollow drilling rod, probe tube, lower sealing cover; Be provided with probe tube in the metal hollow drilling rod, the metal hollow drilling rod is connected with lower sealing cover with top cover labyrinth by fine thread, top cover labyrinth and lower sealing cover comprise respectively charge valve, top cover, pressure housing, inflatable air cushion, O shape circle, be provided with top cover, inflatable air cushion in pressure housing, be provided with O shape circle between pressure housing and top cover, inflatable air cushion, top cover is provided with charge valve.
The internal diameter of described metal hollow drilling rod is 40~200 millimeters, 5~20 millimeters of wall thickness, and 2 to 3 meters of single-unit length, metal hollow drilling rod upper end is that external screw thread, lower end are internal thread.
Described probe tube is thin-wall pipes, the internal diameter coupling of its external diameter, length and metal hollow drilling rod, and wall thickness is no more than 5 millimeters.
As follows with the step of the using method of the supporting halmeic deposit rock core pressurizer of seabed rig:
1) calculate top cover labyrinth and the required preliminary filling gas pressure of lower sealing cover according to the depth of water by following empirical formula, by special-purpose inflatable tool, to inflatable air cushion inflated with nitrogen or air in top cover labyrinth and lower sealing cover, inflatable air cushion pushes up outward, and empirical formula is: P i/ P b=1.7 * 10 3* P b+ 0.018, P ithe pressure of the pre-inflatable body of air cushion, P bbe seabed pressure, unit is MPa;
2) the seabed rig is from arrival seabed, sea, and in top cover labyrinth and lower sealing cover, inflatable air cushion is compressed by seawater, and it is minimum that volume reduces to, and inflatable air cushion is pressed close to top cover labyrinth and lower sealing cover;
The probe tube that 3) will be full of sample is promoted to well head one by one put temporarily and drilled after, the metal hollow drilling rod is pulled out one by one, often extract one, be about to the probe tube that a joint is full of sample and put into wherein, and be screwed into top cover labyrinth and lower sealing cover in the metal hollow two ends of drill;
When 4) rig rises to sea from seabed, the metal hollow drilling rod that has sample and probe tube increases because of ocean temperature, external pressure reduces and expands, compressed nitrogen or air balance in the inflatable air cushion that formed pressure drop is set up by top cover labyrinth and lower sealing cover, maintain interior pressure stable, realize pressure holding function.
The present invention supports the use with rig under water, and the process that can make halmeic deposit extract sea from seabed keeps original position pressure, and guarantees that the hydrocarbon gas such as methane does not does not scatter and disappear, and hydrate does not melt.The present invention is suitable for using the boring coring of rig team marine sediment under water, can be widely used in marine resources and reconnoitre, and especially hydrate and deep water hydrocarbon resource, also be suitable for the engineer geological prospecting boring coring of large-scale petroleum platform addressing process.
The accompanying drawing explanation
Fig. 1 is and the supporting halmeic deposit rock core pressurize scenario-frame schematic diagram of seabed rig;
Fig. 2 is top cover labyrinth structural representation of the present invention;
Fig. 3 is lower sealing cover structural representation of the present invention;
In figure: top cover labyrinth 1, metal hollow drilling rod 2, probe tube 3, lower sealing cover 4, charge valve 5, top cover 6, pressure housing 7, inflatable air cushion 8, O shape circle 9.。
The specific embodiment
As shown in Figure 1, 2, 3, and the supporting halmeic deposit rock core pressurizer of seabed rig comprise top cover labyrinth 1, metal hollow drilling rod 2, probe tube 3, lower sealing cover 4; Be provided with probe tube 3 in metal hollow drilling rod 2, metal hollow drilling rod 2 is connected with lower sealing cover 4 with top cover labyrinth 1 by fine thread, top cover labyrinth and lower sealing cover comprise respectively charge valve 5, top cover 6, pressure housing 7, inflatable air cushion 8, O shape circle 9, be provided with top cover 6, inflatable air cushion 8 in pressure housing 7, be provided with O shape circle 9 between pressure housing 7 and top cover 6, inflatable air cushion 8, top cover 6 is provided with charge valve 5.
The double pressurize cylinder of doing of described metal hollow drilling rod 2, the internal diameter of metal hollow drilling rod 2 is 40~200 millimeters, 5~20 millimeters of wall thickness, 2 to 3 meters of single-unit length, metal hollow drilling rod 2 upper ends are that external screw thread, lower end are internal thread.When sampling, metal hollow drilling rod 2 is connected section by section; After getting core and completing, the probe tube 3 that will be full of sample is inserted in metal hollow drilling rod 2, and metal hollow drilling rod 2 is connected with lower sealing cover 4 with top cover labyrinth 1 by fine thread, by O shape circle 9, top cover labyrinth 1 and lower sealing cover 4, realizes pressure holding function.
Described probe tube 3 is thin-wall pipes, the internal diameter coupling of its external diameter, length and metal hollow drilling rod (2), and wall thickness is no more than 5 millimeters.
As follows with the step of the using method of the supporting halmeic deposit rock core pressurizer of seabed rig:
1) calculate top cover labyrinth 1 and the required preliminary filling gas pressure of lower sealing cover 4 according to the depth of water by following empirical formula, by special-purpose inflatable tool, to top cover labyrinth 1 and interior inflatable air cushion 8 inflated with nitrogen of lower sealing cover 4 or air, the outer top of inflatable air cushion 8, empirical formula is: P i/ P b=1.7 * 10 3* P b+ 0.018, P ithe pressure of the pre-inflatable body of air cushion, P bbe seabed pressure, unit is MPa;
2) the seabed rig is from arrival seabed, sea, the interior inflatable air cushion 8 of top cover labyrinth 1 and lower sealing cover 4 is compressed by seawater, and it is minimum that volume reduces to, and inflatable air cushion 8 is pressed close to top cover labyrinth 1 and lower sealing cover 4, there is charge valve 5 in the outside, uses front by the pre-inflated with nitrogen of inflatable air cushion 8 or air;
3) drilling process is used the wire line coring technology, the probe tube 3 that will be full of sample is promoted to well head one by one put temporarily and drilled after, metal hollow drilling rod 2 is pulled out one by one, often extract one, being about to the probe tube 3 that a joint is full of sample puts into wherein, and being screwed into top cover labyrinth 1 and lower sealing cover 4 at metal hollow drilling rod 2 two ends, this process completes by programme controlled manipulator;
When 4) rig rises to sea from seabed, the metal hollow drilling rod 2 that has sample and probe tube 3 increases because of ocean temperature, external pressure reduces and expands, compressed nitrogen or air balance in the inflatable air cushion 8 that formed pressure drop is set up by top cover labyrinth 1 and lower sealing cover 4, therefore can maintain interior pressure stable, realize pressure holding function.

Claims (3)

1. one kind and the supporting halmeic deposit rock core pressurizer of seabed rig, is characterized in that comprising top cover labyrinth (1), metal hollow drilling rod (2), probe tube (3), lower sealing cover (4); Be provided with probe tube (3) in metal hollow drilling rod (2), metal hollow drilling rod (2) is connected with lower sealing cover (4) with top cover labyrinth (1) by fine thread, top cover labyrinth and lower sealing cover include charge valve (5), top cover (6), pressure housing (7), inflatable air cushion (8), O shape circle (9), be provided with top cover (6), inflatable air cushion (8) in pressure housing (7), be provided with O shape circle (9) between pressure housing (7) and top cover (6), inflatable air cushion (8), top cover (6) is provided with charge valve (5).
2. a kind of and supporting halmeic deposit rock core pressurizer of seabed rig as claimed in claim 1, the internal diameter that it is characterized in that described metal hollow drilling rod (2) is 40~200 millimeters, 5~20 millimeters of wall thickness, 2 to 3 meters of single-unit length, metal hollow drilling rod (2) upper end is that external screw thread, lower end are internal thread.
3. a kind of and supporting halmeic deposit rock core pressurizer of seabed rig as claimed in claim 1, is characterized in that described probe tube (3) is thin-wall pipes, the internal diameter coupling of its external diameter and metal hollow drilling rod (2), and wall thickness is no more than 5 millimeters.
CN 201110056030 2011-03-09 2011-03-09 Deep-sea sediment core pressure-maintaining device matched with submarine drilling rig and method for using deep-sea sediment core pressure-maintaining device Expired - Fee Related CN102182414B (en)

Priority Applications (1)

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Publication number Priority date Publication date Assignee Title
GB201301033D0 (en) * 2013-01-21 2013-03-06 Natural Environment Res Council Determining gas content of a core sample
CN109113614B (en) * 2018-08-13 2020-03-06 四川大学 Constant temperature and constant pressure rock core fidelity cabin

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US5341693A (en) * 1993-01-14 1994-08-30 Ocean Test Equipment, Inc. Double wall sampler
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CN101078674A (en) * 2007-06-12 2007-11-28 浙江大学 Deep sea air-tight water-sampling bottle
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US4587857A (en) * 1984-10-18 1986-05-13 Western Geophysical Company Of America Method for mounting poorly consolidated core samples
US5341693A (en) * 1993-01-14 1994-08-30 Ocean Test Equipment, Inc. Double wall sampler
DE102005053360B3 (en) * 2005-11-07 2007-03-08 Düsterloh, Uwe, Dr. Ing. Sample e.g. cylindrical rock core, storing container, has pressure pieces, where each piece has passage channel that includes two orifices in lateral edge of pieces and in truncated conical surface facing sample, respectively
CN101078674A (en) * 2007-06-12 2007-11-28 浙江大学 Deep sea air-tight water-sampling bottle
CN101398349A (en) * 2008-07-04 2009-04-01 中国地质科学院矿产资源研究所 Deposit pore water in-situ airtightness acquisition system

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海底沉积物保真采样技术研究进展;秦华伟等;《热带海洋学报》;20090731;第28卷(第4期);第42-48页 *
白玉湖等.天然气水合物取样技术及装置进展.《石油钻探技术》.2010,第38卷(第6期),第116-122页.
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Inventor after: Ye Ying

Inventor after: Qin Huawei

Inventor after: An Li

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Inventor after: Chen Jiawang

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