CN109611086B - The monitoring of secondary gas hydrate synthesis and inhibition system and method based on multilateral well - Google Patents
The monitoring of secondary gas hydrate synthesis and inhibition system and method based on multilateral well Download PDFInfo
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- CN109611086B CN109611086B CN201811486346.1A CN201811486346A CN109611086B CN 109611086 B CN109611086 B CN 109611086B CN 201811486346 A CN201811486346 A CN 201811486346A CN 109611086 B CN109611086 B CN 109611086B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 29
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical group C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 238000003786 synthesis reaction Methods 0.000 title claims abstract description 27
- 230000005764 inhibitory process Effects 0.000 title claims abstract description 17
- 238000002347 injection Methods 0.000 claims abstract description 68
- 239000007924 injection Substances 0.000 claims abstract description 68
- 238000006243 chemical reaction Methods 0.000 claims abstract description 62
- 238000011161 development Methods 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 70
- 239000007788 liquid Substances 0.000 claims description 38
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 22
- 239000012530 fluid Substances 0.000 claims description 14
- 239000002826 coolant Substances 0.000 claims description 13
- 230000002093 peripheral effect Effects 0.000 claims description 13
- 230000006837 decompression Effects 0.000 claims description 11
- 238000000926 separation method Methods 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 6
- 238000000354 decomposition reaction Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 238000012790 confirmation Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 2
- 239000000110 cooling liquid Substances 0.000 claims description 2
- 230000018109 developmental process Effects 0.000 claims 3
- 230000007423 decrease Effects 0.000 claims 1
- 230000011218 segmentation Effects 0.000 claims 1
- 239000003643 water by type Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 26
- 238000011084 recovery Methods 0.000 abstract description 17
- 238000013461 design Methods 0.000 abstract description 7
- 230000002401 inhibitory effect Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 43
- 238000011160 research Methods 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 6
- 238000005065 mining Methods 0.000 description 6
- 150000004677 hydrates Chemical class 0.000 description 5
- 238000012502 risk assessment Methods 0.000 description 5
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0099—Equipment or details not covered by groups E21B15/00 - E21B40/00 specially adapted for drilling for or production of natural hydrate or clathrate gas reservoirs; Drilling through or monitoring of formations containing gas hydrates or clathrates
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
- E21B47/07—Temperature
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- Fluid Mechanics (AREA)
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Abstract
The present invention discloses a kind of monitoring of secondary gas hydrate synthesis and inhibition system and method based on multilateral well, the system comprises multilateral well development system, injection module, temperature control module, hydrate reaction kettle, monitoring modular and data acquisition units etc., multilateral well development system is arranged in hydrate reaction kettle, and injection module, monitoring modular and collection of products module are connected with data acquisition unit.System design not only may be implemented to monitor hydrate is exploited under different branch horizontal well combination conditions during in horizontal well secondary hydrate generate situation, but also after capable of studying and forming secondary hydrate in branch horizontal well recovery process, branch horizontal well outer wall water-bath collet optimum temperature rise amplitude, realize the purpose for effectively inhibiting branch levels well plugging, improving production efficiency, and then monitoring and inhibition of the realization to secondary gas hydrate synthesis, there is great importance to the exploitation of hydrate high efficiency and safe working.
Description
Technical field
The invention belongs to hydrate hiding development technique and its flowing safeguard technology fields, and in particular to one kind is based on more
The secondary gas hydrate synthesis monitoring of Multilateral Wells and inhibition system and method.
Background technique
Hydrate storage in sea area is formed under low temperature, condition of high voltage by very long geological environment by natural gas and water,
Usual preservation is below the seabed in 300 meters of depth bounds in deposit.Exploitation of gas hydrates has become unconventional oil and gas
The research hotspot for hiding engineering, due to hydrate itself low temperature, high pressure occurrence condition, the exploitation hidden at this stage to hydrate is mainly
Pass through voltage drop method, heat injection method, inhibitor method and novel extraction system (such as CO2Displacement method etc.) it realizes.In all recovery methods, drop
Platen press is the main means that current sea area hydrate exploitation uses due to its technical feasibility and economical and effective.
Due to the risk of exploitation of gas hydrates and technical higher, and need the spending of great number and long-term
Prepare, hydrate exploitation technology is studied still based on laboratory experiment.During exploitation of gas hydrates field test, due to
The limitation of existing gas-liquid separation technology can not be entirely free of methane in water production pipeline；If hydrate runin is adopted for a long time
It carries out, unsegregated methane and seawater are possible to generate hydrate again in water production pipeline, increase to certain to hemihydrate content
Pipeline will be blocked when degree, cause the bottom pressure of recovery well to reduce failure, and then can cause what hydrate runin adopted to be forced
Stop.Currently, being rarely reported for the secondary experimental provision for generating blocking production tubing risk assessment and designing of hydrate, seriously
The secondary generation blocking production tubing risk assessment experiment simulation work of hydrate is limited, hydrate exploitation remains exploitation
The threat of well casing blocking.
Up to now, only Japan has carried out sea area hydrate runin with Chinese two countries and has adopted, and is to use vertical well
Voltage drop method exploitation, but for the high investment of sea area exploitation, this kind of vertical well decompression extraction system production gas benefit is still lower, and
And enough understanding is still currently lacked to the withdrawal mechanism of gas hydrates, especially hydrate is secondary in recovery process
The risk assessment aspect for generating and blocking production tubing is unable to satisfy engineering actual demand.How novel mining method is designed, and
And using novel mining method simultaneously, how effective guarantee safe working be current researcher concern emphasis.
Summary of the invention
The present invention proposes a kind of monitoring of secondary gas hydrate synthesis and inhibition system and method based on multilateral well, not only
Can to the secondary hydrate under different branch horizontal well combination conditions generate situation be monitored, and to research Multilateral Wells outside
Wall water-bath collet optimum temperature rise amplitude effectively inhibits branch levels well plugging, raising production efficiency to be of great significance.
The present invention, which is that the following technical solution is employed, to be realized: a kind of secondary gas hydrate synthesis monitoring based on multilateral well
With inhibition system, including multilateral well development system, injection module, temperature control module, hydrate reaction kettle, monitoring modular, product
Collection module and data acquisition unit；The multilateral well development system is arranged in hydrate reaction kettle, injection module, prison
It surveys module and collection of products module is connected with data acquisition unit；
The multilateral well development system includes intermediate main borehole and multiple rows of branch with the axially vertical setting of main borehole
Horizontal well, and each row's branch horizontal well is uniformly distributed along main borehole circumferencial direction, it is uniformly tight on the outer wall of branch horizontal well
Solid matter shows multiple wellholes, and the wellhole is blocked by the sintered filter core for being only capable of that two kinds of fluids of gas and water is allowed to pass through, and will deposition
Object gravel blocks outside branch horizontal well, the more efficiently volume increase realized in hydrate development process；Each branch horizontal well
Outer wall on it is corresponding be equipped with water-bath collet, water-bath collet is a closed system, and corresponding with wellhole on water-bath collet
Position hollow out (i.e. consistent with the upper and lower borehole wall wellhole of branch horizontal well), water-bath collet is connected with a hot water cyclesystem, the heat
Water circulation system includes sequentially connected water tank, insulating box and liquid circulation pump, water-bath collet sheet as a complete closure system,
The design of this collet does not influence hydrate products stream and flows to pit shaft, and the later period when hydrate generation, can pass through in monitoring well
The mode that hot water circuit is injected into this collet promotes hydrate to decompose, and prevents branch horizontal well raw due to secondary hydrate
At and cause wellhole to block；
Peripheral cavity is provided with outside the hydrate reaction kettle, hydrate reaction kettle autoclave body uses aluminum alloy material, sets thereon
It is equipped with kettle cover, hydrate reaction kettle passes through the sealed connection of flange and upper kettle cover, and upper kettle cover is dismountable cuboid, resistance to
Press 40MPa；The temperature control module includes coolant liquid water tank and its control valve, and coolant liquid water tank is anti-by circulation line and hydrate
The peripheral cavity of kettle is answered to be connected to, to be embodied as having for system temperature in hydrate reaction kettle with constantly recycling by the injection of coolant liquid
Effect control；
The injection module includes gas injection module, water injection module and its corresponding flowmeter, and gas injection module is infused by lower part
Gas pipeline is connected with hydrate reaction kettle, and water injection module is connected by top fluid injection pipeline with hydrate reaction kettle, and flowmeter is set
It sets on corresponding gas injection, fluid injection pipeline, realizes the injection of hydrate reaction gas reactor and liquid, and pass through control gas note
Enter the experimental condition that amount realizes different hydrate concentrations；The monitoring modular includes being arranged on each branch horizontal well inner wall often
Temperature sensor, pressure sensor and viscosity sensor between two wellholes are realized at different location in branch horizontal well two
The real-time judge that secondary hydrate generates；
The collection of products module includes product gas receiving flask and Product liquid collection vessel, product gas receiving flask and
Product liquid collection vessel is connected by a gas-liquid separator with hydrate reaction kettle, and gas-liquid separator and hydrate reaction kettle
Between be additionally provided with counterbalance valve；The data acquisition unit is used to acquire and handle the flowmeter measurements of injection module, monitoring
Each point temperature, pressure and k value, branch horizontal well outer wall water in branch horizontal well during the decomposition of hydrate of module monitors
Bathe the gas of output, fluid flow data after water temperature and hydrate reaction kettle separate in collet.
Based on system described above, in addition the present invention also proposes a kind of secondary gas hydrate synthesis monitoring and suppressing method, packet
Include following steps:
A, secondary gas hydrate synthesis monitoring:
(1) it is segmented inspection system component part leakproofness, confirmation leakproofness is intact, closes hydrate reaction bottom portion and unloads
Multilateral well development system is fixed on hydrate reaction kettle lower part by lotus valve；
(2) back-up sand in hydrate reaction kettle, it then follows layering back-up sand and the principle that is constantly compacted, up to be fully filled with for
Only, kettle cover is covered, and is fixed with flange；System components are connected to data acquisition unit；
(3) outlet valve, the branch horizontal well outside water-bath collet heat injection valve for closing each branch horizontal well, open injection
The fluid injection valve of module, fills water in hydrate reaction kettle, then turns on gas injection valve, and methane gas is injected in reaction kettle,
Until reaching both constant-pressures；
(4) it communicates hydrate reaction kettle peripheral cavity temperature control system control valve with atmosphere, low temperature cold is injected in peripheral cavity
But liquid, until being screwed onto control valve (three-way valve) and being connected with coolant liquid water tank circulation loop, circulating cooling liquid is after filling
Hydrate reaction kettle cools down at least 120 hours, if period system pressure declines, needs again toward system after-teeming methane gas to both level pressure
Power；
(5) after hydrate reaction temperature in the kettle, pressure stablize 24 hours, the level at least two different locations is opened
Multilateral Wells adjust counterbalance valve to both constant-pressures, carry out decompression decomposition to system, utilize temperature, the pressure acquired in branch horizontal well
Whether power, viscosity data analyze and determine secondary hydrate generation in Multilateral Wells, at the same time, preheat in advance to liquid in water tank
To determined temperature；
(6) when observing that the temperature measured in Multilateral Wells, viscosity start to increase, and pressure sensor measurements start to drop
When low, certain two measuring point pressure difference increase, then prove there is secondary hydrate to generate in Multilateral Wells, metering is from after the generation of secondary hydrate
The gas of branch levels well effluent after separation and aquatic products output change in 30min；If gas quantum of output and aquatic products output are obvious
Become smaller, and branch's borehole pressure still constantly increases, then further demonstrates that closing object there are secondary water in Multilateral Wells generates；
B, secondary gas hydrate synthesis inhibits:
The injection valve for opening the outer water-bath collet of branch horizontal well carries out hot-water flooding circulation heating to branch horizontal well, and
Measure branch's well temperature, pressure, viscosity changing rule and product gas after separation and aquatic products output in temperature-rise period
Changing rule, by constantly increasing different degrees of inhibition of the circulating hot water temperature realization to secondary gas hydrate synthesis.
Compared with prior art, the advantages and positive effects of the present invention are:
The monitoring of secondary gas hydrate synthesis and inhibition system and method based on multilateral well that this programme is proposed, pass through
Specific design to multilateral well development system and temperature control module etc. may be implemented to monitor under different branch horizontal well combination conditions
Secondary hydrate generates situation in horizontal well during exploitation hydrate, and is formed to studying in branch horizontal well recovery process
After secondary hydrate, Multilateral Wells outer wall water-bath collet optimum temperature rise amplitude is realized and effectively inhibits branch levels well plugging, improves life
It produces efficiency to be of great significance, can be realized the monitoring of the formation to secondary hydrate and inhibits；
In addition the system research level well heat injection method can also exploit efficiency and joint decompression when hydrate is stored simultaneously
Method exploitation effect, and under same recovery method (decompression/heat injection) branch horizontal well difference well spacing position to exploitation production capacity
It influences, by proposing a kind of new mining method, effectively increases the withdrawal mechanism understanding to gas hydrates, it is especially split
The secondary generation of hydrate during adopting and the research blocked in terms of the risk assessment of production tubing is of great significance.
Detailed description of the invention
Fig. 1 is monitoring described in the embodiment of the present invention and the structure connection diagram for inhibiting system；
Fig. 2 is the schematic top plan view of multilateral well development system in Fig. 1；
Fig. 3 is the water-bath collet schematic diagram on single branch horizontal well and its outer wall；
Wherein: 1, hydrate reaction kettle；2, peripheral cavity；3, multilateral well development system main borehole；4, branch horizontal well；5,
Water-bath collet；6, methane gas cylinder；7, intermediate receptacle；8, water injection module water tank；9, hot water cyclesystem water tank；10, insulating box；
11, liquid circulation pump；12, coolant liquid water tank；13, temperature control module control valve；14, hydrate reaction bottom portion unloading valve；15, it carries on the back
Pressure valve；16, gas-liquid separator；17, product gas receiving flask；18, Product liquid collection vessel；19, data acquisition unit；20,
Branch horizontal well water-bath collet hollow out.
Specific embodiment
In order to which the above objects, features and advantages of the present invention is more clearly understood, with reference to the accompanying drawing and implement
The present invention will be further described for example.It should be noted that in the absence of conflict, in embodiments herein and embodiment
Feature can be combined with each other.
Embodiment 1, a kind of secondary gas hydrate synthesis monitoring based on multilateral well and inhibition system, as shown in Figure 1, including
Multilateral well development system, injection module, temperature control module, hydrate reaction kettle 1, monitoring modular, collection of products module and number
According to acquisition unit；The multilateral well development system is arranged in hydrate reaction kettle 1, injection module, monitoring modular and product
Collection module is connected with data acquisition unit 19；The multilateral well development system includes intermediate main borehole 3 and and main shaft
Multiple rows of branch horizontal well 4 of 3 axially vertical settings of eye, and each row's branch horizontal well 4 uniformly divides along 3 circumferencial direction of main borehole
Cloth, for example, each row's branch horizontal well is provided with 6, as shown in Fig. 2, 60 ° of branch horizontal well interval in same sagittal plane,
Uniform close is arranged with multiple wellholes on the outer wall of branch horizontal well 4, and with reference to Fig. 3, the preferred wellhole of the present embodiment is along branch's water
The upper and lower borehole wall of horizontal well is symmetrical arranged, and the wellhole is blocked by the sintered filter core for being only capable of that two kinds of fluids of gas and water is allowed to pass through, and
Deposit gravel is blocked outside branch horizontal well, the more efficiently volume increase realized in hydrate development process；Each branch
Corresponding on the outer wall of horizontal well 4 to be equipped with water-bath collet 5, water-bath collet 5 is a closed system, and aluminium alloy is used to make, and
Position corresponding with wellhole hollow out 20 (i.e. consistent with the upper and lower borehole wall wellhole of branch horizontal well) on water-bath collet, water-bath folder
Set 5 is connected with a hot water cyclesystem, and the hot water cyclesystem includes that sequentially connected water tank 9, insulating box 10 and liquid follow
Ring pump 11, water-bath collet sheet do not influence hydrate products stream and flow to pit shaft as a complete closure system, the design of this collet, and
When later period, hydrate generated in monitoring well, it can promote to be hydrated by way of injecting hot water circuit in mutually this water-bath collet 5
Object is decomposed, and prevents branch horizontal well from causing wellhole to block since secondary hydrate generates；By controlling different branch's water
The opening and closing of horizontal well may be implemented hydrate and be stored under different branch horizontal well combining forms to exploit, and branch horizontal well combination is more
Sample；And the water-bath collet of Multilateral Wells outer wall can also realize hydration by being only injected into hot water (being different from voltage drop method exploitation)
The single heat injection method of object reservoir is exploited.
Peripheral cavity 2 is provided with outside the hydrate reaction kettle 1,1 autoclave body of hydrate reaction kettle uses aluminum alloy material, thereon
It is provided with kettle cover, hydrate reaction kettle passes through the sealing of flange and upper kettle cover, and upper kettle cover is dismountable cuboid, pressure resistance
40MPa；The temperature control module includes coolant liquid water tank 12 and its control valve 13, and coolant liquid water tank 12 passes through circulation line and hydration
The peripheral cavity 2 of object reaction kettle is connected to, to be embodied as system temperature in hydrate reaction kettle by the injection of coolant liquid and continuous circulation
Effective control of degree.
The injection module includes gas injection module, water injection module and its corresponding flowmeter, and gas injection module includes methane gas
Bottle 6 and intermediate receptacle 7, gas injection module are connected by lower part gas injection pipeline with hydrate reaction kettle 1, and water injection module includes water tank 8,
It is connected by top fluid injection pipeline with hydrate reaction kettle 1, flowmeter is arranged on corresponding gas injection, fluid injection pipeline, realizes water
The injection of object reaction gas reactor and liquid is closed, and realizes the test bar of different hydrate concentrations by controlling gas injection rate
Part；The monitoring modular includes temperature sensor, the pressure sensing being arranged on each branch horizontal well inner wall between every two wellhole
Differential pressure pickup between device, viscosity sensor and two measuring points is realized raw to hydrate secondary at different location in branch horizontal well
At real-time judge.
The data acquisition unit 19 is used to acquiring and handling the flowmeter measurements of injection module, monitoring module monitors
Each point temperature, pressure, viscosity and point-to-point transmission pressure difference, branch horizontal well outer wall water in branch horizontal well during decomposition of hydrate
Bathe the gas of output, fluid flow data after water temperature and hydrate reaction kettle separate in collet；The collection of products module packet
Product gas receiving flask and Product liquid collection vessel are included, product gas receiving flask and Product liquid collection vessel pass through a gas-liquid
Separator is connected with hydrate reaction kettle, and is additionally provided with counterbalance valve between gas-liquid separator and hydrate reaction kettle.
The monitoring of secondary gas hydrate synthesis and inhibition system based on multilateral well that the present embodiment is proposed, by monitoring mould
The design of block, temperature control module is realized and monitors and inhibit to secondary gas hydrate synthesis, can effectively improve production efficiency, and guarantee
Exploitation safety, the secondary generation of hydrate in recovery process and the research that blocks in terms of the risk assessment of production tubing has important meaning
Justice.
Embodiment 2, the monitoring of secondary gas hydrate synthesis and inhibition system, the present embodiment proposed based on embodiment 1 propose one
The secondary gas hydrate synthesis monitoring of kind and suppressing method, comprising the following steps:
A, secondary gas hydrate synthesis monitoring:
(1) it is segmented inspection system component part leakproofness, confirmation leakproofness is intact, closes 1 bottom of hydrate reaction kettle
Multilateral well development system is fixed in hydrate reaction kettle 1 by unloading valve 14；
(2) back-up sand in hydrate reaction kettle 1, it then follows layering back-up sand and the principle that is constantly compacted, up to be fully filled with for
Only, kettle cover is covered, and is fixed with flange, connection system each unit module to data acquisition unit 19；
(3) outlet valve, the branch horizontal well outside water-bath collet heat injection valve for closing each branch horizontal well, open injection
The fluid injection valve of module, fills water in hydrate reaction kettle, then turns on gas injection valve, and methane gas is injected in reaction kettle,
Until reaching both constant-pressure (such as 4MPa)；
(4) it communicates the control valve 13 of hydrate reaction kettle temperature control module with atmosphere, sub-cooled is injected in peripheral cavity
Liquid (such as 2 DEG C) recycles cold until being screwed onto control valve (three-way valve) 13 and being connected with coolant liquid water tank circulation loop after filling
But liquid cools down at least 120 hours for hydrate reaction kettle, if period system pressure declines, needs again toward system after-teeming methane gas
To both constant-pressures；
(5) after hydrate reaction temperature in the kettle, pressure stablize 24 hours, the level at least two different locations is opened
Multilateral Wells adjust counterbalance valve 15 to both constant-pressures for example, opening the valve that top layer is in same radially two branch horizontal wells
(such as normal pressure) carries out decompression decomposition to system, utilizes temperature, pressure, pressure difference and the viscosity data acquired in branch horizontal well point
Analysis judges whether have secondary hydrate to generate in Multilateral Wells, at the same time, preheats in advance to liquid in hot water cyclesystem water tank 9
To determined temperature (such as 4 DEG C)；
(6) when observing that the temperature measured in Multilateral Wells, viscosity start to increase, and pressure sensor measurements start to drop
When low, certain two measuring point pressure difference increase, then prove there is secondary hydrate to generate in Multilateral Wells, metering is from after the generation of secondary hydrate
The gas of branch levels well effluent after separation and aquatic products output change in 30min；If gas quantum of output and aquatic products output are obvious
Become smaller, and branch's borehole pressure still constantly increases, then further demonstrates that closing object there are secondary water in Multilateral Wells generates；
B, secondary gas hydrate synthesis inhibits:
It opens the outer water-bath collet of branch horizontal well and injects valve, hot-water flooding circulation heating is carried out to branch horizontal well, and count
Measure the gas and aquatic products of branch's well temperature, pressure, pressure difference, viscosity changing rule and product after separation in temperature-rise period
Output changing rule, by constantly increasing different degrees of inhibition of the circulating hot water temperature realization to secondary gas hydrate synthesis.
The present invention program not only may be implemented to monitor under different branch horizontal well combination conditions exploit hydrate during water
Secondary hydrate generates situation in horizontal well, but also after capable of studying and forming secondary hydrate in branch horizontal well recovery process,
Multilateral Wells outer wall water-bath collet optimum temperature rise amplitude is realized and effectively inhibits branch levels well plugging, and production efficiency, realization pair are improved
The formation monitoring and inhibition of secondary hydrate, efficiency and joint when in addition being stored to research level heat injection method exploitation hydrate
Voltage drop method exploitation effect, and under same recovery method (decompression/heat injection), branch horizontal well difference well spacing position produce exploitation
The influence of energy all has significance, specific as follows:
1) secondary hydrate condition of production monitoring in horizontal well under different Multilateral Wells exploitation patterns:
The present embodiment, can be with by controlling branch horizontal well opening and closing respectively by taking 6 × 6=36 multi-branched horizontal well as an example
Realize that the secondary hydrate condition of production and production capacity are poor in horizontal well in hydrate recovery process under a variety of Multilateral Wells combining forms
It is different.For example, determined if the axial six equal part planes of main borehole can be divided into 1-6 layers from top to bottom in each layer with 12 o'clock direction again
Justice is 1, Multilateral Wells in same level plane is defined as 1-6 clockwise, and defineTypically it is for a layers of b branch Multilateral Wells
System can simulateAnd 36 a variety of Multilateral Wells combinations such as Multilateral Wells standard-sized sheet
Under the conditions of recovery process, and the secondary hydrate condition of production and production capacity difference in Multilateral Wells can be monitored in recovery process.
2) it studies in branch horizontal well recovery process and forms optimum temperature rise amplitude after secondary hydrate:
In experimental test procedures, when monitoring has the generation of secondary hydrate in branch horizontal well, past point can be passed through
Different temperatures hot water, the influence that research temperature melts secondary hydrate are injected in branch well outer wall water-bath collet, and are tested with this
The most heat injection temperature of economy out.
3) the production capacity contrast difference of different recovery methods:
The design of this programme Multilateral Wells mining system, may be implemented to the production capacity contrast difference under the conditions of different recovery methods,
And two kinds of mining methods when being used in combination exploitation production capacity improve efficiency；For example, determining a kind of exploitation Multilateral Wells combination condition
Under, by two groups of comparative experimentss, first group only carries out reduced pressure operation by counterbalance valve to selected Multilateral Wells, and second group only to choosing
Fixed Multilateral Wells inject hot water (no reduced pressure operation), compare Multilateral Wells in two groups of experimentations and produce gas after separation, produce water rule.
Similarly, in the case where determining a kind of exploitation Multilateral Wells combination condition, by two groups of comparative experimentss, first group only to selected
Multilateral Wells carry out reduced pressure operation, and second group is being depressured while injecting certain temperature hot water, monitor and produce gas in two groups of experimentations, produce
Water rule, to inquire into influence of the heat injection method to decompression production efficiency.
4) under same recovery method, influence of the branch horizontal well difference well spacing position to exploitation production capacity:
Multilateral Wells mining system design of the invention, moreover it is possible to realize when a kind of determining recovery method (voltage drop method or heat injection method)
When, influence of the different Multilateral Wells positions to production capacity can be studied by multiple groups comparative experiments；For example, when determining only through control back
When pressure valve realizes decompression exploitation, as described in 1), three groups of experiments select respectivelyWithMultilateral Wells are decomposed, then can be with
Inquiring into different level well location and setting influences decompression exploitation production capacity；Similarly, it is decomposed when selection only controls reservoir by injection hot water
When, as described in 1), three groups of experiments select respectivelyWithMultilateral Wells are decomposed, then can study different level well location
Setting influences heat injection exploitation production capacity.
The above is only preferred embodiments of the invention, realize decompression exploitation using two radial level Multilateral Wells, are not
The invention has other forms of limitations, and any person skilled in the art adds possibly also with the technology contents of the disclosure above
To change or be modified as equivalent variations of equivalent embodiments applied to other fields, but it is all without departing from technical solution of the present invention
Content, any simple modification, equivalent variations and remodeling to the above embodiments, still fall within according to the technical essence of the invention
The protection scope of technical solution of the present invention.
Claims (2)
1. the monitoring of secondary gas hydrate synthesis and inhibition system based on multilateral well, which is characterized in that developed including multilateral well
System, injection module, temperature control module, hydrate reaction kettle, monitoring modular, collection of products module and data acquisition unit produce
Object collection module is connected by counterbalance valve with hydrate reaction kettle, and multilateral well development system is arranged in hydrate reaction kettle,
Injection module, monitoring modular and collection of products module are connected with data acquisition unit；
The multilateral well development system includes intermediate main borehole and multiple rows of branch levels with the axially vertical setting of main borehole
Well, and each row's branch horizontal well is uniformly distributed along main borehole circumferencial direction, is evenly arranged on the borehole wall of branch horizontal well
Multiple wellholes, the wellhole are blocked by the sintered filter core for being only capable of that two kinds of fluids of gas and water is allowed to pass through；Each branch horizontal well
Corresponding on outer wall to be equipped with water-bath collet, water-bath collet is a closed system, and the position corresponding with wellhole on water-bath collet
Set hollow out；Water-bath collet is also connected with a hot water cyclesystem, and the hot water cyclesystem includes sequentially connected water tank, constant temperature
Case and liquid circulation pump；
The hydrate reaction kettle includes autoclave body and upper kettle cover, and autoclave body is connect with upper kettle cover by flange seal, hydrate reaction
Peripheral cavity is additionally provided with outside kettle, peripheral cavity is connected with temperature control module, and the temperature control module includes coolant liquid water tank and its control valve,
Coolant liquid water tank is connected to by circulation line with peripheral cavity, anti-to be embodied as hydrate with continuous circulation by the injection of coolant liquid
Answer effective control of system temperature in kettle；
The injection module includes gas injection module, water injection module and its corresponding flowmeter, and gas injection module passes through lower part air injection pipe
Line is connected with hydrate reaction kettle, and water injection module is connected by top fluid injection pipeline with hydrate reaction kettle；The monitoring modular
Including measuring point between every two wellhole is arranged on each branch horizontal well inner wall, the point position is provided with temperature sensor, pressure
Force snesor, differential pressure pickup and viscosity sensor are realized and generate shape to hydrate secondary at different location in branch horizontal well
The real-time monitoring of state；
The data acquisition unit is used to acquire and handle branch's water of the flowmeter measurements of injection module, monitoring module monitors
In horizontal well in each measuring point temperature, pressure and k value and point-to-point transmission pressure difference, branch horizontal well outer wall water-bath collet water temperature and
The gas of output, fluid flow data after the separation of hydrate reaction kettle.
2. based on the monitoring of secondary gas hydrate synthesis and the method for inhibition system described in claim 1 based on multilateral well,
It is characterized in that, comprising the following steps:
A, secondary gas hydrate synthesis monitoring:
(1) segmentation checks secondary gas hydrate synthesis monitoring and inhibits system components leakproofness, and confirmation leakproofness is intact, closes
Hydrate reaction bottom portion unloading valve is closed, multilateral well development system is fixed in hydrate reaction kettle；
(2) back-up sand in hydrate reaction kettle, it then follows layering back-up sand and the principle being constantly compacted, until being fully filled with, lid
Upper kettle cover, and fixed with flange seal, connect secondary gas hydrate synthesis monitoring and inhibition system components to data acquisition unit；
(3) outlet valve of each branch horizontal well, the heat injection valve of branch horizontal well outside water-bath collet are closed, injection mould is opened
The fluid injection valve of block, fills water in hydrate reaction kettle, then turns on gas injection valve, methane gas is injected in reaction kettle, directly
To reaching both constant-pressures；
(4) it communicates the control valve being connected to hydrate reaction kettle peripheral cavity with atmosphere, cryogenic liquid is injected in peripheral cavity,
Until being screwed onto control valve and being connected with coolant liquid water tank circulation loop after filling, circulating cooling liquid cools down for hydrate reaction kettle
At least 120 hours, if in period hydrate reaction kettle pressure decline, need again in hydrate reaction kettle after-teeming methane gas to both
Constant-pressure；
(5) after hydrate reaction temperature in the kettle, pressure stablize 24 hours, the horizontal branch at least two different locations is opened
Well adjusts counterbalance valve to both constant-pressures, carries out decompression decomposition to the hydrate formed in hydrate reaction kettle, utilize branch levels
Temperature, pressure, viscosity and the pressure difference data acquired in well analyzes and determines whether have secondary hydrate to generate in Multilateral Wells, same with this
When, determined temperature is preheated in advance to liquid in water tank；
(6) when observing that the temperature measured in Multilateral Wells, viscosity start to increase, and pressure sensor measurements start to reduce, certain
When two measuring point pressure differences increase, then prove there is secondary hydrate to generate in Multilateral Wells, metering generates 30min later from secondary hydrate
The gas of interior branch levels well effluent after separation and aquatic products output change；If gas quantum of output obviously becomes smaller with aquatic products output,
And branch's borehole pressure still constantly increases, then further demonstrates that there are secondary waters to close object generation in Multilateral Wells, even plugs well
Interior circulation passage；
B, secondary gas hydrate synthesis inhibits:
The injection valve for opening the outer water-bath collet of branch horizontal well carries out hot-water flooding to branch horizontal well by hot water cyclesystem
Circulation heating, and branch levels well temperature in temperature-rise period, pressure, pressure difference, viscosity changing rule and product are measured through dividing
Gas and liquid quantum of output changing rule from after are realized by constantly increasing circulating hot water temperature to secondary gas hydrate synthesis
Inhibit in various degree.
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| CN112127849B (en) * | 2019-06-24 | 2021-07-23 | 南京延长反应技术研究院有限公司 | Control system for exploiting combustible ice |
| CN112127872B (en) * | 2019-06-24 | 2024-03-22 | 南京延长反应技术研究院有限公司 | Safety monitoring system in combustible ice exploitation process |
| CN110821448B (en) * | 2019-11-14 | 2022-02-18 | 中国科学院广州能源研究所 | Exploitation method and exploitation device for marine natural gas hydrate |
| CN111879912B (en) * | 2020-08-05 | 2023-02-21 | 中国海洋石油集团有限公司 | Experimental device and method for monitoring secondary generation of drilling and production natural gas hydrate |
| CN111929341A (en) * | 2020-08-06 | 2020-11-13 | 中国科学院广州能源研究所 | Formation temperature gradient simulator |
| CN112031714B (en) * | 2020-08-06 | 2021-07-27 | 中国科学院广州能源研究所 | Three-dimensional comprehensive test mining system of large-scale full-size mining well |
| CN114961661A (en) * | 2021-02-19 | 2022-08-30 | 中国石油天然气集团有限公司 | Sea natural gas hydrate exploitation reservoir sand migration experimental device and experimental method |
| CN113204050B (en) * | 2021-04-27 | 2022-03-22 | 青岛海洋地质研究所 | Method for preparing hydrate reservoirs with different burial depths |
| CN115492572B (en) * | 2022-11-21 | 2023-01-17 | 吉林大学 | One-dimensional simulation device and method for secondary formation of natural gas hydrate |
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| US6281274B1 (en) * | 1999-10-12 | 2001-08-28 | Isp Investments Inc. | Method for preventing or retarding the formation of gas hydrates |
| CN1176741C (en) * | 2003-04-01 | 2004-11-24 | 中国地质大学（武汉） | Comprehensive test equipment for natural gas hydrate |
| CN101046146A (en) * | 2007-04-06 | 2007-10-03 | 中国科学院广州能源研究所 | Simulating experiment equipment for 2D exploitation of natural gas hydrate |
| CN101550816B (en) * | 2009-05-20 | 2011-12-07 | 中国科学院广州能源研究所 | Three-dimensional exploitation simulated experiment apparatus for natural gas hydrate |
| CN101963057B (en) * | 2010-09-21 | 2013-01-23 | 中国科学院广州能源研究所 | Simulation experimental device for natural hydrate geological stratification |
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