CN104929601A - Variable-frequency vibration exploitation method of offshore gas hydrate - Google Patents
Variable-frequency vibration exploitation method of offshore gas hydrate Download PDFInfo
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- CN104929601A CN104929601A CN201510299712.2A CN201510299712A CN104929601A CN 104929601 A CN104929601 A CN 104929601A CN 201510299712 A CN201510299712 A CN 201510299712A CN 104929601 A CN104929601 A CN 104929601A
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Abstract
The invention discloses a variable-frequency vibration exploitation method of offshore gas hydrate and belongs to the technical field of offshore resource exploitation. The variable-frequency vibration exploitation method includes steps of drilling a methane gas hydrate reservoir layer via an offshore drilling rig, releasing stress energy to promote decomposing of gas hydrate by a vibrator at the top of a drill pipe, gathering the decomposed methane gas around drilling holes and enabling the methane gas to move upwards along the drill holes by means of natural pressure difference of the hydrate decomposing area and the drill holes; controlling rising speed of the methane gas, and collecting the methane gas from the drill holes to the drilling rig by a collector and storing. By adjusting energy of the vibrator, different frequencies of excitation energy are applied according to different saturation degrees of methane reservoir layers, the vibration energy can be adjusted according to decomposition of the methane gas, and decomposing speed and range of the gas hydrate can be effectively controlled; disasters such as unordered seabed landslide due to changes of depositional conditions are avoided.
Description
Technical field
The invention belongs to marine resources production technique field, especially relevant with a kind of ocean gas hydrate variant-frequency vibration exploitation method.
Background technology
The main component of ocean gas hydrate is methane; be in bottom sediment methane and hydrone under cryogenic high pressure environment in conjunction with a kind of energy minerals of formation; have that energy density is high, stock number is huge, clean clean feature; be generally acknowledged a kind of 21st century novel energy, have great importance in development of resources, environmental protection and Global climate change etc.The generation of ocean gas hydrate and decomposition are complicated dynamic processes, and its restraining factors are the change of temperature, pressure condition, i.e. the combination of low temperature, high pressure, and lack obvious specific border condition separately.Current gas hydrate develops general several method, as voltage drop method, heating power method, chemical agent injection method, CO
2displacement method, fluorine gas+microwave method etc., its method mainly based on temperature-rising methods such as microwave, warm saline injections, and is just deposited region carried out extracting experiment in Canada, the tax of Muscovite land ever frozen soil gas hydrate.The covering and sealing condition that lack permafrost region top layer, land are deposited in the tax of ocean gas hydrate, directly soft sedimentary deposit is covered on gas hydrate enriched layer, exploitation disturbance very easily causes the disaster such as submarine landslide and seawater acidifying, therefore production technique requires higher, does not still have specific extracting experiment well location up to now.The process that said method decomposes solid-state gas hydrate and scope are difficult to control, and the ocean gas hydrate that may cause therefrom leaks and submarine landslide etc. is difficult to Forecast and control.For above-mentioned defect, applicant has been researched and developed one and can have been avoided causing the unordered decomposition of sea bottom hydrate by artificial disturbance, thus causes the ocean gas hydrate variant-frequency vibration exploitation method of seabed disaster.
Summary of the invention
Object of the present invention is intended to overcome process that existing ocean gas hydrate exploitation method decomposes solid-state gas hydrate and scope and is difficult to control and causes causing gas hydrate and leak and submarine landslide, therefore provides a kind of can avoiding changed by sea-bottom deposit condition after methane release and cause the ocean gas hydrate variant-frequency vibration exploitation method of the disasters such as submarine landslide.
For this reason, the present invention by the following technical solutions: a kind of ocean gas hydrate variant-frequency vibration exploitation method, is characterized in that,
1, first by offshore drilling platform, methane gas hydrate reservoir is goed deep in boring;
2, the vibrator release then by being arranged on drilling rod top stress impel gas hydrate to decompose by energy, utilizes the natural pressure reduction of decomposition of hydrate district and boring, and methane gas enrichment around boring of decomposition also moves up along boring;
3, control the speed that methane gas rises, move to the methane gas of offshore boring island by gathering-device collection storage by from boring.
As to technique scheme supplement and perfect, the present invention also comprises following technical characteristic.
Described stress energy be the vibration wave of different frequency, the vibrational energy of the vibrating device release that vibration wave impels gas hydrate to decompose, vibrator is released energy by vibration wave, vibration wave acts on gas hydrate nitride layer, impel the reduction of pressure and the rising of temperature, break gas hydrate and stablize the temperature-pressure conditions composed and deposit, impel the decomposition of hydrate.
Described vibrator is variable frequency vibrator.
The region lower to gas hydrate saturation ratio in hydrate reservoir, variable frequency vibrator is adjusted to high-frequency vibration, release dither ripple, the hydrate fast decoupled impelling saturation ratio low; To the saturate region of gas hydrate in deposit, the direct result that fast decoupled causes is exactly blowout, and thus, in boring, variable frequency vibrator is adjusted to low-frequency vibration, and the low frequency vibration ripple releasing energy lower, impels hydrate slowly to decompose.By above-mentioned steps, one side ensures that gas generates the stable of total amount, controls speed and the scope of gas hydrate decomposition on the other hand.
Detection methane gas hydrate reservoir and thickness thereof rely on and make an explanation and inverting to the data that marine artificial earthquake gathers, seismic wave all has obvious difference in the spread speed of the free gas layer of bottom sediment, gas hydrate and its underpart, phase place, judges reservoir thickness thus.
Use the present invention can reach following beneficial effect: the present invention is by the size of adjustment vibrator energy, the methane reservoirs of different saturation is applied to the hammer vibration energy of different frequency, and according to the size of methane gas decomposition amount adjustment vibrational energy, thus can effectively control speed and the scope of gas hydrate decomposition; The vibration wave produced by vibration, impels the compaction that overlying sediments produce are raw, can Fast Filling gas hydrate decompose after the methane gas hole of separating out, avoid causing unordered submarine landslide by Action of Gravity Field.
Detailed description of the invention
Ocean gas hydrate variant-frequency vibration exploitation method, its step is as follows:
1, first by offshore drilling platform, methane gas hydrate reservoir is goed deep in boring;
2, the vibrator release then by being arranged on drilling rod top stress impel gas hydrate to decompose by energy, utilizes the natural pressure reduction of decomposition of hydrate district and boring, and methane gas enrichment around boring of decomposition also moves up along boring;
3, control the speed that methane gas rises, move to the methane gas of offshore boring island by gathering-device collection storage by from boring.
Further, vibrator is variable frequency vibrator.Stress energy be the vibration wave of different frequency, the vibrational energy of the vibrating device release that vibration wave impels gas hydrate to decompose, vibrator is released energy by vibration wave, vibration wave acts on gas hydrate nitride layer, impel the reduction of pressure and the rising of temperature, break gas hydrate and stablize the temperature-pressure conditions composed and deposit, impel the decomposition of hydrate.
Further, the region lower to gas hydrate saturation ratio in hydrate reservoir, variable frequency vibrator is adjusted to high-frequency vibration, release dither ripple, the hydrate fast decoupled impelling saturation ratio low; To the saturate region of gas hydrate in deposit, the direct result that fast decoupled causes is exactly blowout, and thus, in boring, variable frequency vibrator is adjusted to low-frequency vibration, and the low frequency vibration ripple releasing energy lower, impels hydrate slowly to decompose.By above-mentioned steps, one side ensures that gas generates the stable of total amount, controls speed and the scope of gas hydrate decomposition on the other hand.
Vibration wave is utilized to control the process of decomposition water compound and the principle of scope: the size that variable frequency vibrator releases energy is to control process and the scope of gas hydrate decomposition.High-frequency vibratory energy is intensive, and sphere of action is little, can so that gas hydrate fast decoupled among a small circle; Low-frequency vibration energy is lower, but sphere of action is large, can consequently decompose at a slow speed on a large scale by gas hydrate.
Detection methane gas hydrate reservoir and thickness thereof rely on and make an explanation and inverting to the data that marine artificial earthquake gathers, seismic wave all has obvious difference in the spread speed of the free gas layer of bottom sediment, gas hydrate and its underpart, phase place, judges reservoir thickness thus.When boring enters hydrate layer, can there is significant change in the physical parameter that offshore platform collects, the degree of porosity, density, gas content etc. of such as sample.Deep concrete scope is determined by reservoir thickness, and general boring is directly deep into reservoir position more on the lower.
There is maximum problem and impelling in the gas hydrate decomposable process of ocean exactly in prior art, the process of decomposition and scope are difficult to control, thus are difficult to prediction to harmfulness consequences such as the submarine landslide of causing thus, Leakage Gas.The application is by the size of adjustment vibrator energy, the methane reservoirs of different saturation is applied to the hammer vibration energy of different frequency, and according to the size of methane gas decomposition amount adjustment vibrational energy, thus can effectively control speed and the scope of gas hydrate decomposition; The ripple that shakes produced by vibration, impels the compaction that overlying sediments produce are raw, can Fast Filling gas hydrate decompose after the methane gas hole of separating out, avoid being changed by sedimentary condition causing unordered submarine landslide.
More than show and describe general principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and manual just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (5)
1. an ocean gas hydrate variant-frequency vibration exploitation method, is characterized in that: described ocean gas hydrate variant-frequency vibration exploitation method step is as follows:
First by offshore drilling platform, methane gas hydrate reservoir is goed deep in boring; Then the vibrator release by being arranged on drilling rod top stress impel gas hydrate to decompose by energy, utilizes the natural pressure reduction of decomposition of hydrate district and boring, and methane gas enrichment around boring of decomposition also moves up along boring; By controlling the speed that methane gas rises, move to the methane gas of offshore boring island by gathering-device collection storage by boring.
2. a kind of ocean according to claim 1 gas hydrate variant-frequency vibration exploitation method, is characterized in that: described vibrator is variable frequency vibrator.
3. a kind of ocean according to claim 2 gas hydrate variant-frequency vibration exploitation method, it is characterized in that: described stress energy be the vibration wave of different frequency, the vibrational energy of the vibrating device release that vibration wave impels gas hydrate to decompose, vibrator is released energy by vibration wave, vibration wave acts on gas hydrate nitride layer, impel the reduction of pressure and the rising of temperature, break gas hydrate and stablize the temperature-pressure conditions composed and deposit, impel the decomposition of hydrate.
4. a kind of ocean gas hydrate variant-frequency vibration exploitation method according to claim 1 or 3, it is characterized in that: the region lower to gas hydrate saturation ratio in hydrate reservoir, variable frequency vibrator is adjusted to high-frequency vibration, release dither ripple; To the saturate region of gas hydrate in deposit, in boring, variable frequency vibrator is adjusted to low-frequency vibration, the low frequency vibration ripple releasing energy lower.
5. a kind of ocean according to claim 4 gas hydrate variant-frequency vibration exploitation method, it is characterized in that: the data that detection methane gas hydrate reservoir and thickness thereof gather for the marine artificial earthquake of dependence make an explanation and inverting, whether seismic wave all has obviously difference to obtain in the spread speed of the free gas layer of bottom sediment, gas hydrate and its underpart, phase place.
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| CN108952639A (en) * | 2018-09-10 | 2018-12-07 | 西南石油大学 | A kind of method of joint gas displacement and oscillator field exploitation of gas hydrate hiding |
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