CN109736752A - A kind of voltage drop method auxiliary temperature control CO2The recovery method of displacer gas hydrate - Google Patents
A kind of voltage drop method auxiliary temperature control CO2The recovery method of displacer gas hydrate Download PDFInfo
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- CN109736752A CN109736752A CN201910052642.9A CN201910052642A CN109736752A CN 109736752 A CN109736752 A CN 109736752A CN 201910052642 A CN201910052642 A CN 201910052642A CN 109736752 A CN109736752 A CN 109736752A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/70—Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells
Abstract
The present invention discloses a kind of voltage drop method auxiliary temperature control CO2The recovery method of displacer gas hydrate is related to exploitation of gas hydrates field, comprising the following steps: progress voltage drop method exploitation first injects CO using gas injection well when yield is too low2Replacement exploitation of gas hydrate is carried out, exploitation of gas hydrates and note CO are made2Gas carries out displacement reaction while carrying out, it replaces in reaction process, outlet pressure by controlling injection pump controls gas hydrates reservoir pressure within the scope of the carbon dioxide hydrate vapor pressure for corresponding to gas hydrates reservoir temperature, when the critical balance temperature that the temperature of the gas injection well horizontal segment is generated close to gas hydrates, CO is injected by control2Temperature realize that the displacement reaction in stratum is lasting and carry out, prevent from causing displacement reaction that can not carry out since temperature is too low, promote displacement efficiency, realize that the effective of gas hydrates exploits and CO2Effective Geological storage.
Description
Technical field
The present invention relates to exploitation of gas hydrates fields, assist temperature control CO more particularly to a kind of voltage drop method2Replace day
The recovery method of right gas hydrate.
Background technique
Gas hydrates (being commonly called as combustible ice) be expected to become 21 century after shale gas, tight gas, coal bed gas, oil-sand etc. it
It is followed by land permafrost band and coastal shelf 300-3000m depth of water sea area being mainly distributed on, wherein about for one of energy
90% is stored in blue water.In short, gas hydrates have huge Development volue.Currently, traditional recovery method is main
There are voltage drop method, temperature activation method and chemical agent method, novel mining method mainly has CO2Displacement method and solids production method.
Voltage drop method principle is to make it below the corresponding hydrate of the regional temperature by reducing hydrate reservoir pore pressure
Vapor pressure breaks hydrate stable condition and makes its decomposition.Voltage drop method is usually to reduce hydrate layer to underlie free gas-bearing formation
Pressure or extract hydrate reservoir fluid.The method exploits the consumption of hydrate process empty calory and loss, does not need continuous agitation,
Cost is relatively low, is the prefered method in all recovery methods.But voltage drop method is specifically included that there is also defect first is that hydrate
It is decomposed into endothermic process, temperature, which constantly reduces, will lead to the secondary generation of gas hydrates or stratum water freezing, lead to reservoir
Permeability decrease, spread speed is slower in the earth formation for pressure drop, influence gas hydrate dissociation produce gas velocity degree；Second is that natural
The exploitation of gas hydrate causes the reduction of formation strength, may cause stratum unstability, causes largely to shake out and well head is caused to block.
CO2It is the major inducing factor of global warming, by the attention of scientists, using burying CO2Displacer gas water
The natural gas closed in object is increasingly becoming one of emerging research direction.Replacement process does not have the decomposition of hydrate, replacement process simultaneously
The occurrence of occurring in situ, not will cause stratum unstability injects CO2Stratum energy can be supplemented, recovery ratio is improved.But CO2
Displacement method has the following deficiencies: first is that displacement efficiency is bad, causes the amount of burying smaller；Second is that leading to CH4And CO2Mixing, brings gas
The cost of body separation, and also result in CO2-CH4The production of mixed gas hydrate, reduces gas production and CO2The amount of burying.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of voltage drop method auxiliary temperature control CO2Displacer gas hydrate
Recovery method injects the CO of certain temperature under suitable pressure2New balance is contacted and reached with gas hydrates, is promoted
Displacement efficiency realizes effective exploitation and the CO of gas hydrates2Effective Geological storage.
To achieve the above object, the present invention provides following schemes:
The present invention provides a kind of voltage drop method auxiliary temperature control CO2The recovery method of displacer gas hydrate, including following step
It is rapid:
Step 1: boring gas injection well and several producing wells that note reaches gas hydrates reservoir, the producing well includes
It produces well vertical section and the producing well horizontal segment in gas hydrates reservoir, the gas injection well includes gas injection well vertical section
It is located at the gas injection well horizontal segment in gas hydrates reservoir with several groups, gas injection well horizontal segment described in one group and a life
It is corresponding to produce well；
Step 2: choosing decompression position to the producing well horizontal segment, well is drilled to gas water using low density slurries
The decompression of object reservoir is closed, the portion of natural gas decomposition of hydrate near wellbore reservoir is made, forms seepage channel, when gas water closes
The pressure of object reservoir is down to 15% or less hydrate phase balance pressure corresponding to gas hydrates reservoir temperature or reaches work
When journey actual requirement, stop decompression exploitation；
Step 3: the production casing under the gas injection well horizontal segment, then plays oil pipe, the gas injection well horizontal segment is carried out
Perforation completion injects CO2Gas carries out displacement reaction, and the outlet pressure by controlling injection pump controls gas hydrates reservoir
Pressure is within the scope of the carbon dioxide hydrate vapor pressure for corresponding to gas hydrates reservoir temperature, when the gas injection well
When the critical balance temperature that the temperature of horizontal segment is generated close to gas hydrates, CO is injected by control2Temperature realize ground
The lasting progress of displacement reaction in layer, stops when gas production is decreased obviously or reaches engineering design minimum requirements to institute
State gas injection well injection CO2；
Step 4: the producing well horizontal segment uses the complete well of well-case perforating, the natural gas transportation of exploitation to the producing well
In the gas-liquid separator of well head connection, it is collected into liquid respectively by the liquids and gases isolated after the gas-liquid separator
In tank and air collector.
Preferably, in said step 1, the extending direction of the gas injection well horizontal segment and the producing well horizontal segment
Extending direction be it is opposite, gas injection well horizontal segment described in each group include two gas injection branch horizontal wells, a gas injection branch
Horizontal well is at the top of gas hydrates reservoir, another described gas injection branch horizontal well is close to gas hydrates reservoir bottom
Portion, the producing well horizontal segment are between two gas injection branch horizontal wells.
Preferably, in the step 3, each gas injection branch horizontal well is divided into gas injection branch horizontal well leading portion, note
Gas branch horizontal well interlude and gas injection branch horizontal well latter end, every section is isolated by packer, realizes CO2Displacer gas hydration
The subregion of object reaction carries out, the gas injection branch horizontal well leading portion, the gas injection branch horizontal well interlude and the gas injection
Branch horizontal well latter end is mounted on pressure sensor and temperature sensor, and the pressure sensor and the temperature sensor are equal
It is connect with controller, the controller and the CO for being injected in the opposite gas injection well2The heater that gas is heated connects
It connects, the controller can control the heating temperature of the heater.
Preferably, in the step 3, first to the gas injection branch levels close to gas hydrates reservoir bottom
Well subregion carries out CO2Displacer gas hydrate reaction, then to the gas injection point at the top of gas hydrates reservoir
Branch horizontal well subregion carries out CO2Displacer gas hydrate reaction；Or first at the top of gas hydrates reservoir
Gas injection branch horizontal well subregion carries out CO2Displacer gas hydrate reaction, then to close to gas hydrates reservoir
The gas injection branch horizontal well subregion of bottom carries out CO2Displacer gas hydrate reaction；Or first to unidirectional
Two gas injection branch horizontal well latter ends carry out CO2Displacer gas hydrate reaction, then to described in unidirectional two
Gas injection branch horizontal well interlude carries out CO2Displacer gas hydrate reaction, finally to unidirectional two gas injections
Branch horizontal well leading portion carries out CO2Displacer gas hydrate reaction.
Preferably, in the step 4, the producing well horizontal segment is using slotted liner and outside the slotted liner
Carry out gravel filling sand prevention protection.
Preferably, in the step 4, gas flowmeter is set between the gas separator and the air collector.
Preferably, in said step 1, pattern of well is according to five-spot, and the producing well is set as four mouthfuls, the note
Gas well is in center, and the gas injection well horizontal segment of four groups of different directions, four mouthfuls of producing well settings are arranged in the gas injection well
In the gas injection well periphery.
Preferably, the depth of gas injection well horizontal segment described in each group is different.
The present invention achieves following technical effect compared with the existing technology:
Voltage drop method of the invention assists temperature control CO2The recovery method of displacer gas hydrate, first progress voltage drop method are opened
It adopts, when yield is too low, injects CO using gas injection well2Replacement exploitation of gas hydrate is carried out, exploitation of gas hydrates is made
With note CO2Gas carries out displacement reaction while carrying out, and replaces in reaction process, and the outlet pressure by controlling injection pump controls day
Right gas hydrate reservoir pressure is in the carbon dioxide hydrate vapor pressure range for corresponding to gas hydrates reservoir temperature
It is interior, when the critical balance temperature that the temperature of the gas injection well horizontal segment is generated close to gas hydrates, injected by control
CO2Temperature realize that the displacement reaction in stratum is lasting and carry out, prevent from causing displacement reaction that can not carry out since temperature is too low, mention
Displacement efficiency is risen, realizes effective exploitation and the CO of gas hydrates2Effective Geological storage.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is that voltage drop method of the present invention assists temperature control CO2The schematic diagram of the recovery method of displacer gas hydrate；
Fig. 2 is the schematic diagram of producing well in the present invention；
Fig. 3 is the top view of five-spot pattern of well in the present invention.
Description of symbols: 1, CO2Gas tank；2, injection pump；3, shale layer；4, gas hydrates reservoir；5, first is outstanding
Hanging device；6, packer；7, gas injection branch horizontal well leading portion；8, gas injection branch horizontal well interlude；9, gas injection branch horizontal well end
Section；10, temperature sensor；11, pressure sensor；12, producing well temperature sensor；13, producing well pressure sensor；14, gas
Liquid/gas separator；15, liquid tank；16, gas flowmeter；17, air collector；18, controller；19, sand control installation；20, surface pipe；
21, protective casing；22, cement sheath；23, the second hanger；24, tail pipe；25, producing well packer；26, slotted liner；27, gravel
Stone；28, preforation tunnel；29, gas injection well；30, producing well.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The present invention provides a kind of voltage drop method auxiliary temperature control CO2The recovery method of displacer gas hydrate, in suitable pressure
The CO of certain temperature is injected under power2New balance is contacted and reached with gas hydrates, promotes displacement efficiency, realizes natural gas
Effective exploitation of hydrate and CO2Effective Geological storage.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
As shown in Figure 1-3, the present embodiment provides a kind of voltage drop methods to assist temperature control CO2The exploitation side of displacer gas hydrate
Method, comprising the following steps:
Step 1: boring gas injection well 29 and several producing wells 30 that note reaches gas hydrates reservoir 4, producing well 30 is wrapped
Extraction well vertical section and the producing well horizontal segment in gas hydrates reservoir 4 are included, gas injection well 29 includes that gas injection well is vertical
Section and several groups are located at the gas injection well horizontal segment in gas hydrates reservoir 4, one group of gas injection well horizontal segment and a producing well
30 is corresponding；
Step 2: choosing decompression position to producing well horizontal segment, well is drilled to gas hydrates using low density slurries
Reservoir 4 is depressured, and makes the portion of natural gas decomposition of hydrate of near wellbore reservoir, forms seepage channel, when gas hydrates store up
The pressure of layer 4 is down to 15% or less hydrate phase balance pressure corresponding to 4 temperature of gas hydrates reservoir or reaches engineering
When actual requirement, stop decompression exploitation；
Step 3: the production casing under gas injection well horizontal segment, then plays oil pipe, it is complete to carry out perforation to gas injection well horizontal segment
Well injects CO2Gas carries out displacement reaction, and the outlet pressure by controlling injection pump 2 controls 4 pressure of gas hydrates reservoir
Within the scope of the carbon dioxide hydrate vapor pressure for corresponding to 4 temperature of gas hydrates reservoir, when gas injection well horizontal segment
Temperature generated close to gas hydrates critical balance temperature when, pass through control injection CO2Temperature realize stratum in
Displacement reaction is lasting to be carried out, and is stopped when gas production is decreased obviously or reaches engineering design minimum requirements to gas injection well 29
Inject CO2；
Step 4: producing well horizontal segment uses the complete well of well-case perforating, the natural gas transportation of exploitation connects to 30 well head of producing well
In the gas-liquid separator 14 connect, it is collected into 15 He of liquid tank respectively by the liquids and gases isolated after gas-liquid separator 14
In air collector 17.
Specifically, in step 1, the extending direction of gas injection well horizontal segment and the extending direction of producing well horizontal segment are phases
Anti-, each group gas injection well horizontal segment includes two gas injection branch horizontal wells, and a gas injection branch horizontal well is hydrated close to natural gas
4 top of object reservoir, another gas injection branch horizontal well are in two close to 4 bottom of gas hydrates reservoir, producing well horizontal segment
Between a gas injection branch horizontal well.By the way that a gas injection branch horizontal well is respectively arranged up and down in producing well horizontal segment, increases and set
The area changed and region, be conducive to gas hydrates stablizes decomposition and CO2Hydrate quickly generates, and improves displacement effect
Rate.
In step 3, each gas injection branch horizontal well is divided into gas injection branch horizontal well leading portion 7, in gas injection branch horizontal well
Between section 8 and gas injection branch horizontal well latter end 9, every section is isolated by packer 6, realize CO2Point of displacer gas hydrate reaction
Region carries out, and solves single fixed position injection CO2When, due to CO2Hydrate, which generates, causes what injectability gradually decreased to ask
Topic, and the temperature of reservoir, supplement stratum energy can be improved in time to improve replacement rate and reinforce the stability on stratum, while energy
Realize CO2It is buried in the form of hydrate.
In order to be monitored in real time to each section of gas injection branch horizontal well of pressure and temperature, each gas injection branch horizontal well leading portion
7, each gas injection branch horizontal well interlude 8 and each gas injection branch horizontal well latter end 9 are mounted on pressure sensor 11 and temperature passes
Sensor 10, pressure sensor 11 and temperature sensor 10 are connect with controller 18, controller 18 with for opposite gas injection well 29
The CO of middle injection2The heater connection that gas is heated, controller 18 can control the heating temperature of heater.CO2Gas tank 1
In gas be delivered in gas injection well 29 by injection pump 2, heater is set to CO2Between gas tank 1 and injection pump 2, for pair
CO2The CO come out in gas tank 12Gas is heated.When each section of subregion of gas injection branch horizontal well carries out displacement reaction, according to
Whether the temperature value that the temperature sensor 10 of current conversion zone is transmitted back to controller 18 judges the temperature of the conversion zone close to naturally
The critical balance temperature that gas hydrate generates, when the critical balance temperature that the temperature of the conversion zone is generated close to gas hydrates
When, controller 18 controls heater for CO2Gas is heated to set temperature value, injects CO by control2Temperature realize the reaction
The displacement reaction of section is lasting to be carried out, and is prevented from causing displacement reaction that can not carry out since temperature is too low, is promoted displacement efficiency, realize day
Effective exploitation of right gas hydrate and CO2Effective Geological storage.
Set temperature value in different gas injection branch horizontal wells in each section of corresponding controller is different, and each section sets
Temperature value is determined depending on the depth of destination layer position and the length of horizontal segment, mainly considers CO2In injection process, in the wellbore
The heat loss of vertical section and the heat loss of horizontal segment can be gone out according to heat transfer principle and existing mathematical model with primary Calculation
Total amount of heat loss during this, and then determine and replace up-front temperature, school is carried out to the temperature by temperature sensor 10
Just, model is modified, different injection phase CO can be calculated using the mathematical model after improving2Temperature reaches real
When the purpose that monitors and controls.In displacement leading edge CO2It is right to there is heat between formation rock and gas hydrates in the earth formation
Stream and heat transfer, can calculate up-front thermal change according to the thermal coefficient of formation rock and each fluid, in replacement process
Middle gas hydrate dissociation belongs to endothermic process, CO2The formation of hydrate belongs to exothermic process, but CO2Hydrate heat release mentions
The shortage of heat of confession is to maintain the last decompositions of gas hydrates, if without origin of heat, under the premise of pressure is stablized
Gas hydrates will not last decomposition, origin of heat is by CO2It provides, passes through the CO in well head control injection2Temperature,
Control CO2The total amount of heat of carrying is finally reached required heat when control gas hydrate dissociation, realizes that temperature controls day
Right gas hydrate decomposes and CO2The permutizer condition that hydrate generates.
Meanwhile controlling gas injection speed and CO2Hydrate formation speed is adapted, and avoids a large amount of CO2Gas is from CO2Hydrate
Generation leading edge diffuses up and CH4Gas mixing generates CO on reservoir top2Hydrate reduces permeability.
In this specific embodiment, in step 3, first to the gas injection branch water close to 4 bottom of gas hydrates reservoir
Horizontal well subregion carries out CO2Displacer gas hydrate reaction, then to the gas injection branch close to 4 top of gas hydrates reservoir
Horizontal well subregion carries out CO2Displacer gas hydrate reaction.
In another embodiment, in step 3, first to the gas injection branch levels close to 4 top of gas hydrates reservoir
Well subregion carries out CO2Displacer gas hydrate reaction, then to the gas injection branch water close to 4 bottom of gas hydrates reservoir
Horizontal well subregion carries out CO2Displacer gas hydrate reaction.
When carrying out subregion displacement reaction to an individual gas injection branch horizontal well, specific steps are as follows: first to gas injection
Branch horizontal well latter end 9 carries out perforation completion, injects CO2Gas, when the temperature of gas injection branch horizontal well latter end 9 is close to natural gas
When the critical balance temperature that hydrate generates, controller 18 will inject CO by controlling heater2Temperature be heated to this section
Set temperature value is carried out with realizing that displacement reaction is lasting, until gas production is decreased obviously or reaches engineering design minimum requirements
When stop to gas injection well inject CO2；Gas injection branch horizontal well latter end 9 is isolated with packer 6, among gas injection branch horizontal well
Section 8 carries out perforation completion, injects CO2Gas, when the temperature of gas injection branch horizontal well interlude 8 is generated close to gas hydrates
Critical balance temperature when, controller 18 by control heater will inject CO2Temperature be heated to the set temperature value of this section
It is carried out with realizing that displacement reaction is lasting, is stopped when gas production is decreased obviously or reaches engineering design minimum requirements to note
Gas well injects CO2；After gas injection branch horizontal well interlude 8 is isolated with packer 6, to 7 perforation of gas injection branch horizontal well leading portion
Complete well injects CO2Gas, when the critical balance temperature that the temperature of gas injection branch horizontal well leading portion 7 is generated close to gas hydrates
When spending, controller 18 will inject CO by controlling heater2Temperature be heated to the set temperature value of this section to realize that displacement is anti-
It should continue to carry out, stop injecting CO to gas injection well when gas production is decreased obviously or reaches engineering design minimum requirements2。
It is to consider technical parameter and economic benefit about engineering design minimum requirements, in engineering design, if replacement rate
Too low, cost necessarily rises, and overall efficiency necessarily reduces.Different blocks reserves are different, and production cost is different, want to replacement rate
Ask also different, so to execute according to the engineering design minimum requirements in General layout Plan.
In another embodiment, in step 3, first unidirectional two gas injection branch horizontal wells latter end 9 is carried out
CO2Displacer gas hydrate reaction, then CO is carried out to unidirectional two gas injection branch horizontal wells interlude 82Displacement is natural
Gas hydrate reaction, finally carries out CO to unidirectional two gas injection branch horizontal wells leading portion 72Displacer gas hydrate is anti-
It answers.
When carrying out subregion displacement reaction to unidirectional two gas injection branch horizontal wells simultaneously, controller 18 judges
The temperature of conversion zone whether close to gas hydrates generate critical balance temperature when, arbitrarily take two gas injection branch horizontal wells
Measurement one of temperature value of latter end 9, two gas injection branch horizontal well interludes 8 measurement temperature value one or two gas injection branches
One of measurement temperature value of horizontal well leading portion 7, correspondingly, controller 18 arbitrarily take when controlling the heating temperature of heater and are directed to
One of set temperature value of two gas injection branch horizontal well latter ends 9, the set temperature value of two gas injection branch horizontal well interludes 8
One or two gas injection branch horizontal well leading portions 7 one of set temperature value.
In step 3, in production process, the main outlet pressure by gas injection well well head injection pump 2 maintains displacement leading edge
Pressure it is relatively stable.Pressure limit be it is relevant to temperature, in recovery process, maintain pressure stablize it is critically important, according to note
The outlet pressure for entering pump 2 replaces up-front pressure by existing model prediction, is carried out according to 11 numerical value of pressure sensor to model
Amendment, the outlet pressure of the injection pump 2 needed for being calculated under the conditions of replacing leading edge different pressures using revised model, is reached
The purpose of pressure control, and then control 4 pressure of gas hydrates reservoir and corresponding to the two of 4 temperature of gas hydrates reservoir
In carbonoxide hydrate phase balance pressure limit, and then guarantee that displacement reaction is gone on smoothly.
In step 2, producing well horizontal segment is provided with producing well temperature sensor 12 and producing well pressure sensor 13,
And then monitor producing well flowing bottomhole pressure (FBHP) and temperature in real time, 4 pressure of gas hydrates reservoir is judged in voltage drop method production process
Whether the 15% or less of reservoir temperature corresponding to hydrate phase balance pressure is down to.
Controller 18 includes display screen, and display screen can show producing well temperature sensor 12, producing well pressure sensor
13 and the temperature sensor 10 in gas injection branch horizontal well and pressure sensor 11 numerical value.
In step 4, since ocean gas hydrate preservation region has the characteristics that buried depth is shallow, weak cementing, producing
Well horizontal segment uses well-case perforating completion technique, avoids interlayer interference and formation collapse.According to engineering requirements by technology set
Pipe 21 and tail pipe 24 finally realize that horizontal segment subregion is penetrated down toward target zone producing well horizontal segment and in shaft bottom cementing well
Hole, perforating bullet are shot through protective casing 21, cement sheath 22 and penetrate 4 certain depth of gas hydrates reservoir, it is established that fluid seeps
The channel of stream.
Further, it in step 4, in order to avoid there is the problem of shaking out in recovery process, is equipped in producing well horizontal segment
Sand control installation 19, specifically, it is anti-that producing well horizontal segment carries out the filling of gravel 27 using slotted liner 26 and outside slotted liner 26
Sand protection, the gravel layer for being filled in shaft bottom play the role of sand filter, it can allow for the fluids such as gas to pass through, and effectively prevent
Formation particle passes through, and can be effectively prevented causes well head to block due to shaking out.Specifically, 27 partial size D of gravelgIt is reservoir fineness of sand
Intermediate value d505~6 times, the sphericity of gravel 27 is greater than 0.6, and the circularity of gravel 27 is greater than 0.6, and gravel 27 is molten in standard mud acid
Solution weight percent must not exceed 1%.
In step 4, gas flowmeter 16, and then accurate recording are set between gas separator 14 and air collector 17
Gas production.
In this specific embodiment, for pattern of well according to five-spot, producing well 30 is set as four mouthfuls, during gas injection well 29 is in
The gas injection well horizontal segment of four groups of different directions is arranged in the heart, gas injection well 29, and four mouthfuls of producing wells 30 are set to 29 periphery of gas injection well.Pass through
Multi-faceted injection CO2, increase CO2With the contact area of gas hydrates, recovery ratio is improved.Specifically, each group gas injection well water
The depth of flat section is different.
In practical recovery process, intermediate gas injection well 29 and every mouth producing well 30 be individually in different times section into
Capable, during replacing first producing well 30, the layer position of excess-three mouth producing well 30 is not penetrate out production.When complete
After production at a bite producing well 30, this layer of position can be blocked using packer in vertical bore, penetrate out corresponding second mouthful of life
The target phase of the gas injection branch horizontal well of well 30 is produced, and so on, complete the overall replacement exploitation of four mouthfuls of producing wells 30.
Apply that a specific example illustrates the principle and implementation of the invention in this specification, above embodiments
Explanation be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art,
According to the thought of the present invention, there will be changes in the specific implementation manner and application range.In conclusion in this specification
Appearance should not be construed as limiting the invention.
Claims (8)
1. a kind of voltage drop method assists temperature control CO2The recovery method of displacer gas hydrate, which comprises the following steps:
Step 1: boring gas injection well and several producing wells that note reaches gas hydrates reservoir, the producing well includes extraction
Well vertical section and the producing well horizontal segment in gas hydrates reservoir, if the gas injection well include gas injection well vertical section and
Dry group is located at the gas injection well horizontal segment in gas hydrates reservoir, gas injection well horizontal segment described in one group and a producing well
It is corresponding；
Step 2: choosing decompression position to the producing well horizontal segment, well is drilled to gas hydrates using low density slurries
Reservoir decompression, makes the portion of natural gas decomposition of hydrate near wellbore reservoir, forms seepage channel, when gas hydrates store up
The pressure of layer is down to 15% or less hydrate phase balance pressure corresponding to gas hydrates reservoir temperature or reaches engineering reality
When border requires, stop decompression exploitation；
Step 3: the production casing under the gas injection well horizontal segment, then plays oil pipe, perforation is carried out to the gas injection well horizontal segment
Complete well injects CO2Gas carries out displacement reaction, and the outlet pressure by controlling injection pump controls gas hydrates reservoir pressure
Within the scope of the carbon dioxide hydrate vapor pressure for corresponding to gas hydrates reservoir temperature, when the gas injection well is horizontal
When the critical balance temperature that the temperature of section is generated close to gas hydrates, CO is injected by control2Temperature realize stratum in
Displacement reaction it is lasting carry out, stop when gas production is decreased obviously or reaches engineering design minimum requirements to the note
Gas well injects CO2；
Step 4: the producing well horizontal segment uses the complete well of well-case perforating, the natural gas transportation of exploitation to the producing well well head
In the gas-liquid separator of connection, by the liquids and gases isolated after the gas-liquid separator be collected into respectively liquid tank and
In air collector.
2. voltage drop method according to claim 1 assists temperature control CO2The recovery method of displacer gas hydrate, feature exist
In in said step 1, the extending direction of the gas injection well horizontal segment and the extending direction of the producing well horizontal segment are phases
Anti-, gas injection well horizontal segment described in each group includes two gas injection branch horizontal wells, and a gas injection branch horizontal well is close to day
At the top of right gas hydrate reservoir, another described gas injection branch horizontal well is close to gas hydrates reservoir bottom, the production
Well horizontal segment is between two gas injection branch horizontal wells.
3. voltage drop method according to claim 2 assists temperature control CO2The recovery method of displacer gas hydrate, feature exist
In in the step 3, each gas injection branch horizontal well is divided into gas injection branch horizontal well leading portion, gas injection branch horizontal well
Interlude and gas injection branch horizontal well latter end, every section is isolated by packer, realizes CO2The subregion of displacer gas hydrate reaction
Domain carries out, the gas injection branch horizontal well leading portion, the gas injection branch horizontal well interlude and gas injection branch horizontal well end
Section is mounted on pressure sensor and temperature sensor, and the pressure sensor and the temperature sensor connect with controller
It connects, the controller and the CO for being injected in the opposite gas injection well2The heater connection that gas is heated, the control
Device can control the heating temperature of the heater.
4. voltage drop method according to claim 3 assists temperature control CO2The recovery method of displacer gas hydrate, feature exist
In in the step 3, first to the gas injection branch horizontal well subregion progress close to gas hydrates reservoir bottom
CO2Displacer gas hydrate reaction, then to the gas injection branch horizontal well subregion at the top of gas hydrates reservoir
Domain carries out CO2Displacer gas hydrate reaction；Or first to the gas injection branch at the top of gas hydrates reservoir
Horizontal well subregion carries out CO2Displacer gas hydrate reaction, then to the note close to gas hydrates reservoir bottom
Gas branch horizontal well subregion carries out CO2Displacer gas hydrate reaction；Or first to unidirectional two gas injections
Branch horizontal well latter end carries out CO2Displacer gas hydrate reaction, then to the unidirectional two gas injection branch levels
Well interlude carries out CO2Displacer gas hydrate reaction, finally to the unidirectional two gas injection branch horizontal wells before
Duan Jinhang CO2Displacer gas hydrate reaction.
5. voltage drop method according to claim 1 assists temperature control CO2The recovery method of displacer gas hydrate, feature exist
In in the step 4, the producing well horizontal segment carries out gravel filling using slotted liner and outside the slotted liner
Sand control protection.
6. voltage drop method according to claim 1 assists temperature control CO2The recovery method of displacer gas hydrate, feature exist
In gas flowmeter is arranged between the gas separator and the air collector in the step 4.
7. voltage drop method according to claim 1 assists temperature control CO2The recovery method of displacer gas hydrate, feature exist
In, in said step 1, pattern of well is according to five-spot, and the producing well is set as four mouthfuls, and the gas injection well is in center,
The gas injection well horizontal segment of four groups of different directions is arranged in the gas injection well, and four mouthfuls of producing wells are set to the gas injection well week
Side.
8. voltage drop method according to claim 7 assists temperature control CO2The recovery method of displacer gas hydrate, feature exist
In the depth of gas injection well horizontal segment described in each group is different.
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| CN114320239A (en) * | 2021-12-30 | 2022-04-12 | 中国石油大学(北京) | Marine hydrate exploitation and reinjection system and method |
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| CN115217445A (en) * | 2021-04-16 | 2022-10-21 | 中国石油化工股份有限公司 | Device and method for exploiting natural gas hydrate in U-shaped well |
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| WO2023041090A1 (en) * | 2021-12-28 | 2023-03-23 | 中国科学院广州能源研究所 | Device for jetting nitrogen and carbon dioxide mixed gas in horizontal well, and production method |
| CN114320239A (en) * | 2021-12-30 | 2022-04-12 | 中国石油大学(北京) | Marine hydrate exploitation and reinjection system and method |
| CN114542022A (en) * | 2022-02-28 | 2022-05-27 | 山东科技大学 | Deep sea natural gas hydrate filling mining method |
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