CN109372474B - A kind of coal bed gas and sandstone gas are the same as well flow string and recovery method - Google Patents
A kind of coal bed gas and sandstone gas are the same as well flow string and recovery method Download PDFInfo
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- CN109372474B CN109372474B CN201811398632.2A CN201811398632A CN109372474B CN 109372474 B CN109372474 B CN 109372474B CN 201811398632 A CN201811398632 A CN 201811398632A CN 109372474 B CN109372474 B CN 109372474B
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- 239000003245 coal Substances 0.000 title claims abstract description 96
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000011084 recovery Methods 0.000 title claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 claims abstract description 23
- 238000005336 cracking Methods 0.000 claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 20
- 239000010959 steel Substances 0.000 claims description 20
- 238000002347 injection Methods 0.000 claims description 13
- 239000007924 injection Substances 0.000 claims description 13
- 241000521257 Hydrops Species 0.000 claims description 11
- 206010030113 Oedema Diseases 0.000 claims description 11
- 238000010008 shearing Methods 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 4
- 238000012790 confirmation Methods 0.000 claims description 3
- 230000002265 prevention Effects 0.000 claims description 3
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims 1
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- 239000010410 layer Substances 0.000 description 68
- 235000011293 Brassica napus Nutrition 0.000 description 7
- 240000008100 Brassica rapa Species 0.000 description 7
- 235000000540 Brassica rapa subsp rapa Nutrition 0.000 description 7
- 238000005065 mining Methods 0.000 description 6
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- 238000009434 installation Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
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- 238000010276 construction Methods 0.000 description 1
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical class C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/122—Gas lift
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Abstract
The invention discloses a kind of coal bed gas and sandstone gas with well flow string, it include: casing, the outer layer coiled tubing being located in casing and internal layer coiled tubing, outer layer coiled tubing lower end gives up one by the connection of connector one, and a lower end of giving up is sequentially connected safety valve, sliding bush apparatus, packer, sieve blanking plug one；First annular space is formed between casing and outer layer coiled tubing；Packer, which is located in first annular space in the wellbore to completely cut off sandstone and coal seam, to be separated；Shaft bottom maximum pressure when the cracking pressure of safety valve is lower than the cracking pressure of sliding bush apparatus and is higher than gas lift liquid drainage.Corresponding recovery method: first by coal bed gas and sandstone gas with well flow string G.I.H；Producing initial stage, coal bed gas arrange with sandstone gas gaslift point, divide and adopt；Production mid-term coal bed gas and sandstone gas point adopts with well, gas lift liquid drainage；The later period is produced, sandstone gas close with coal bed gas and be adopted.The present invention can be realized respectively in same pit shaft coal bed gas be divided to sandstone gas adopt, gas lift liquid drainage, two gas conjunction adopt.
Description
Technical field
The present invention relates to oil-gas mining fields, and in particular to a kind of coal bed gas and sandstone gas well are the same as well flow string and production
Method.
Background technique
Multilayer sandstone or coal seam are contained for a well both at home and abroad, mining method mainly has commingling production and Tong Jing at present
Multichannel exploits two ways.Wherein the commingling production multiple reservoirs close suitable for pressure coefficient and reservoir properties directly close
It adopts, is mainly used for multiple reservoirs point that pressure system differs greatly with the exploitation of well multichannel and adopts.And same block is contained simultaneously
There is the well of coal bed gas and sandstone gas, since coal bed gas is mainly with ADSORPTION STATE preservation in coal seam, mining method is draining, it is depressured,
It desorbs, in recovery process wants that reservoir pressure will likely be reduced, constantly expand the pressure drop funnel in coal seam.And sandstone gas is assigned with free state
It is stored in sandstone, mining method relies primarily on stratum energy, to maintain strata pressure as far as possible in recovery process.Coal bed gas and sandstone
The reservoir of gas, not only the two pressure system difference is big, but also physical property and mining method also have very big difference.Current mining method
It is using two mouthfuls of wells difference exploiting coal bed methanes and sandstone gas, this mode takes up an area that ground is big, high production cost.For using flatly
Well realizes the production technique of shale gas and coal bed gas simultaneously, has no precedent to go by, difficulty is big.
Summary of the invention
It is an object of the present invention to provide a kind of coal bed gas and sandstone gas with well flow string.
It is a further object to provide the recovery methods that a kind of coal bed gas and sandstone gas are exploited with well.
To achieve the goals above and further advantage, it produces and manages with well the present invention provides a kind of coal bed gas and sandstone gas
Column, structure include: casing, the coaxial outer layer coiled tubing and internal layer coiled tubing being set in casing, outer layer coiled tubing
Lower end gives up one by the connection of connector one, and a lower end of giving up is sequentially connected safety valve, sliding bush apparatus, packer, sieve blocking
Device one；Internal layer coiled tubing lower end gives up two by the connection of connector two, two lower ends connection sieve blanking plug two of giving up.The set
First annular space is formed between pipe and outer layer coiled tubing, forms the second ring between outer layer coiled tubing and internal layer coiled tubing
Shape space.Packer is located at sandstone and coal seam in first annular space and completely cuts off in the wellbore between the two and by sandstone and coal seam point
It opens.Internal layer coiled tubing top is connected to the gate valve A for being located at ground, second annular space and the gate valve for being located at ground
B connection, first annular space are connected to the gate valve C for being located at ground.
The safety valve includes valve body, and valve body center opens up central passage that is coaxial with outer layer coiled tubing and being connected to, is led to
Road interior sidewall surface opens up the stomata being connected to first annular space, the pneumatic valve member of setting in stomata.There are two the stomatas, and two
A stomata is symmetrically arranged at wall surface at left and right sides of valve body, the central axes of the central axes of stomata perpendicular to valve body central through hole.
Stomata both ends internal diameter is smaller, and middle part internal diameter is larger.The pneumatic valve member includes ball seat, ball, gear in stomata
Plate and bar-spring, ball seat are located in stomata close to valve body central passage interior sidewall surface and are connected to the air inlet of stomata.Ball seat
The upper movable ball of setting, for keeping out the air inlet for blocking stomata, baffle is arranged in ball front end, and both ends of the spring bears against gear
On the inside of the gas outlet of plate and stomata.When the pressure in the second annular space is less than the cracking pressure of safety valve, in bar-spring
Under the action of, ball fits closely in ball seat with ball seat inner wall, blocks the air inlet of stomata, and air-tightness is good, completely cuts off completely
First annular space and the second annular space.When the pressure in the second annular space reaches the cracking pressure of safety valve, ball
To moving in the middle part of stomata under the pressure effect in the second annular space, ball pushes baffle to compress bar-spring, the second annular
Fluid in space is flowed out from air inlet.The well when cracking pressure of safety valve is lower than the cracking pressure of sliding bush apparatus and is higher than gaslift
Bottom maximum pressure.
The sliding bush apparatus includes outer layer cylinder, be close to outer layer cylinder inner wall face be arranged inner layer cylinder, outer layer cylinder with it is interior
The contact surface of layer cylinder is equipped with O-ring seals.Inner layer cylinder top is equipped with movable steel ball, and steel ball is in shaft bottom liquid buoyancy or well
It can be moved up and down under the action of bottom pressure；It is fixedly connected between two cylinders by shear pin, when the pressure on rigid ball top is high
When the shearing force of shear pin, pin is cut, and steel ball and inner layer cylinder slide downwards relative to outer layer cylinder.
A kind of operating method carrying out coal bed gas using above-mentioned flow string and sandstone gas is exploited with well, including walk as follows
It is rapid:
S1, by coal bed gas and sandstone gas with well flow string G.I.H, concrete operations are as follows:
S11, outer layer coiled tubing lower end be sequentially connected connector one, one, safety valve of giving up, sliding bush apparatus, packer,
Sieve blanking plug first-class conventional tool, after tool length is compound, by coiled tubing and tool income lubricator, then connection is anti-
Jet pipe and well head；
S12, each manifold and gate are examined successively, confirm it is errorless after, start tripping in tool at this time；
After S13, tool tripping in predetermined depth, start suspension and half Feng Gongneng of four ram preventers, by coiled tubing
It is suspended on well head, after confirmation preventer is partly sealed sealing lattice, well head pressure release cuts continuous pipe using shear ram；
S14, injection head is removed, finishing and straightening processing is carried out to coiled tubing pipe end at well head, pipe end after conditioning
Installation connecting element and Yuan Jing " peckled turnip " (former well " peckled turnip " refers to oily pipe fixing device), for coiled tubing to be fixed on
Well head；
Coiled tubing on S15, injection head also carries out finishing and straightening processing, while installing lubricator additional under blowout prevention box,
" peckled turnip " is completed into tieback in well head；
S16, crane slowly transfer injection head and connect lubricator with well head, close preventer suspension and half Feng Gongneng,
Slowly lower coiled tubing, is fully seated within " peckled turnip " in tubing head；
S17, it is pumped in coiled tubing arrival end, while slowly playing coiled tubing, coiled tubing suspending weight is illustrated as without increase
Function is given up, and is closed wellhead sluice valve, is taken out running tool after well head pressure release；
S18, wellhead sluice valve is opened, is slowly pumped to well head coiled tubing, first by packer setting, packer setting is simultaneously tested
After sealing lattice, continue to be pumped, pressure reaches the setting value of sieve blanking plug one, and sieve blanking plug one falls off at this time, coal seam and outer
Layer coiled tubing connection；
Steel ball is put into S19, outer layers coiled tubing, and internal layer coiled tubing lower end is then sequentially connected following tool:
Connector two, two, sieve blanking plug two of giving up repeat step S13-S17, finally complete the shearing and fixation of internal layer coiled tubing
The work of flow string G.I.H is completed in work.
S2, producing initial stage, coal bed gas arrange with sandstone gas point, divide and adopt
After flow string G.I.H, start to go into operation, while opening the gate valve A, gate valve B, gate valve C on ground, sandstone gas by
First annular space flow to ground and enters air accumulator；Gas is injected to the second annular space using air compressor machine or directly utilizes storage
Sandstone gas in gas tank carries out gas lift liquid drainage to coal seam, and fluid flow to ground from internal layer coiled tubing, then by ground gas-liquid
Separator isolates gas and water, and gas enters air accumulator again；Entire gas lift liquid drainage process, bottom pressure are opened lower than safety valve
Pressure is opened, gas realization recycles；The yield of sandstone gas is controlled by first annular space well head pressure；The lifting rate in coal seam
It is controlled by gas injection rate, realizes the control to pit shaft liquid level, reach the fine drain in coal seam.
S3, into production mid-term after, coal seam formed pressure drop funnel, coal bed gas from coal seam desorb output, at this time coal bed gas with
Sandstone gas is adopted with well point, and sandstone gas is produced by first annular space output, coal bed gas by internal layer coiled tubing or the second annular space
Out；If hydrops, closing gate valve A occur for first annular space during point adopting with well, coal bed gas stops production, using air compressor machine to
Second annular space injects gas or directly using the sandstone gas of output in air accumulator, opens pressure when bottom pressure is higher than safety valve
When power, safety valve is opened, and gaslift enters first annular space for hydrops gaslift to ground；After hydrops discharge, gate valve A is opened,
Coal bed gas and sandstone gas continue point to adopt.
S4, into the production later period, when coal seam pressure and sandstone pressure are close to unanimously (differing 1-2MPa), closing gate valve B,
C, inner layer coiled tubing pump pressure, when the pressure on steel ball top is higher than the shearing force of shear pin, pin is cut, steel ball and interior
Layer circle falls off, and first annular space is connected to internal layer, outer layer coiled tubing, and sandstone gas close with coal bed gas and be adopted, and closes the gas adopted
Body is by first annular space, the second annular space or internal layer coiled tubing output.
Since the technology that same well exploits shale gas and coal bed gas yet there are no report, the present invention combines the design of itself special
Point and live actual condition can generate it is following the utility model has the advantages that
The different characteristics that recovery method of the invention is produced according to coal bed gas and sandstone gas in each stage, divides in the wellbore
Do not realize two gas be divided to adopt, gas lift liquid drainage, two gas close the recovery process adopted.Coal seam, sandstone are isolated in the wellbore using packer
It opens, realizes that sandstone gas produces using first annular space, the production of coal bed gas is realized using inside and outside layer coiled tubing, reaches two
Gas point is adopted.It, can be by closing gate valve A, to the second ring when hydrops occurs sandstone gas for first annular space in process of production
The sandstone gas of shape space injection production, opens the safety-valve, and realizes that sandstone gas recycles, and then realizing will be in first annular space
Hydrops enumerate ground.When the pressure of coal seam reservoirs and sandstone formation is close and pit shaft liquid measure is less, inner layer coiled tubing pump
Enter liquid, steel ball and inner layer cylinder are beaten and taken off, realizes that first annular space is connected to inside and outside layer coiled tubing, sandstone gas and coal
Layer gas can select to reach two from internal layer coiled tubing, the second annular space or first annular Space-time idea according to production needs
Gas conjunction is adopted.
Further advantage, target and feature of the invention will be partially reflected by the following instructions, and part will also be by this
The research and practice of invention and be understood by the person skilled in the art.
Detailed description of the invention
The structural schematic diagram of Fig. 1, coal bed gas of the invention and sandstone gas with well flow string.
The cross-sectional view of Fig. 2, safety valve.
The cross-sectional view of Fig. 3, sliding bush apparatus.
Fig. 4, coal bed gas of the invention and sandstone gas adopt flow chart with two gas point of well recovery method.
The gas lift liquid drainage flow chart of Fig. 5, coal bed gas of the invention and sandstone gas with well recovery method.
Fig. 6, coal bed gas of the invention and sandstone gas adopt flow chart with the two gas conjunction of well recovery method.
Figure label:
Internal layer coiled tubing 1, outer layer coiled tubing 2, casing 3, connector 1, give up one 5, safety valve 6, sliding bush apparatus
7, packer 8, sieve blanking plug 1, sandstone 10, coal seam 12, connector 2 13, give up 2 14, sieve blanking plug 2 15, valve body
61, ball seat 62, ball 63, baffle 64, central passage 65, bar-spring 66, steel ball 71, outer layer cylinder 72, O-ring seals 73,
Inner layer cylinder 74, shear pin 75.
Specific embodiment
Present invention will be described in further detail below with reference to the accompanying drawings, to enable those skilled in the art referring to specification text
Word can be implemented accordingly.
As shown in Figure 1, structure includes: casing the present invention provides a kind of coal bed gas with sandstone gas with well flow string
3, the outer layer coiled tubing 2 and internal layer coiled tubing 1 being coaxially set in casing, 2 lower end of outer layer coiled tubing passes through connector
One 4 connections give up 1, and a lower end of giving up is sequentially connected safety valve 6, sliding bush apparatus 7, packer 8, sieve blanking plug 1；Internal layer
Coiled tubing lower end gives up 2 14 by the connection of connector 2 13, two lower ends connection sieve blanking plug 2 15 of giving up.Described sleeve pipe
First annular space is formed between outer layer coiled tubing, and the second annular is formed between outer layer coiled tubing and internal layer coiled tubing
Space.Packer 8 is located in first annular space sandstone 10 and coal seam 12 between the two and by sandstone 10 and coal seam 12 in pit shaft
Middle isolation separates.1 top of internal layer coiled tubing be located at ground gate valve A be connected to, second annular space be located at
The gate valve B on ground is connected to, and first annular space is connected to the gate valve C for being located at ground.
Connector 1, connector 2 13, one 5,2 14, packer 8 of giving up of giving up, sieve blanking plug 1, sieve blocking
Device 2 15 etc. is conventional tool.Connector is mainly used for connected pipes and gives up, and when tubing string is met and blocked, suppresses reality by pitching
Now give up, thus guarantee give up more than tubing string can smoothly take out, the tubing string for lower part of giving up stays in pit shaft.Packer 8 is main
It is set by suppressing, the anchoring and the separation up and down in first annular space to entire tubing string is realized after setting.Sieve blanking plug 1 is main
Coiled tubing is blocked during tubing string tripping in, avoid sandstone gas in pit shaft from revealing from oil pipe, when tubing string is down toward predetermined depth
And after packer 8 is set, tool bottom is taken off by built-in sieve blanking plug one 9 dozens by suppressing, and realizes oil pipe and pit shaft
Connection.
As shown in Fig. 2, the safety valve 6 includes valve body 61, valve body center opens up coaxial with outer layer coiled tubing and is connected to
Central passage 65, channel side wall surface opens up the stomata being connected to first annular space, the pneumatic valve member of setting in stomata.It is described
There are two stomata bodies, and two stomatas are symmetrically arranged at wall surface at left and right sides of valve body, and the central axes of stomata are perpendicular in valve body
The central axes of heart through-hole.Stomata both ends internal diameter is smaller, and middle part internal diameter is larger.The pneumatic valve member includes being located in stomata
Ball seat 62, ball 63, baffle 64 and bar-spring 66, ball seat be located in stomata close to valve body central passage interior sidewall surface and with
The air inlet of stomata.The ball seat is in the infundibulate that is laterally arranged, and the small-caliber end (leak) of funnel is towards valve body central passage
65, funnel leak is connected to stomata air inlet.Ball 63 is placed in the funnel of ball seat, should for keeping out the air inlet of stomata
Ball can control activity.Baffle 64 is arranged in 63 front end of ball, and 66 both ends of bar-spring bear against the outlet of baffle and stomata
On the inside of mouthful.When the pressure in the second annular space is less than the cracking pressure of safety valve 6, under the action of bar-spring 66, circle
63 surface of ball is fitted closely with ball seat inner wall of hopper face, blocks air inlet, and air-tightness is good, completely cuts off first annular space and the completely
Second ring space.When the pressure in the second annular space reaches the cracking pressure of safety valve, ball 63 is in the second annular space
To mobile, the mobile compression bar-spring 66 of the promotion baffle 64 of ball 63 in the middle part of stomata, the second annular space under interior pressure effect
Interior fluid can be flowed out from the leak of ball seat funnel.The cracking pressure of safety valve 6 is lower than the cracking pressure and height of sliding bush apparatus 7
Shaft bottom maximum pressure when gas lift liquid drainage.
As shown in figure 3, the sliding bush apparatus 7 includes outer layer cylinder 72, it is close to outer layer cylinder inner wall face and inner layer cylinder is set
74, the contact surface of outer layer cylinder and inner layer cylinder is equipped with O-ring seals 73.Inner layer cylinder top is equipped with movable steel ball 71, steel
Ball can move up and down under the action of shaft bottom liquid buoyancy or bottom pressure.Connect between two cylinders by the way that shear pin 75 is fixed
It connects, when the pressure on steel ball top is higher than the shearing force of shear pin, pin is cut, and steel ball and inner layer cylinder are relative to outer layer circle
Cylinder slides downwards.
When carrying out coal bed gas and sandstone gas with well exploitation construction using above-mentioned flow string, firstly, by coal bed gas and sand
Rock gas is the same as well flow string G.I.H；After flow string tripping in, the well prepares to go into operation at this time, and operation is divided into production just
Phase, production mid-term, production later period.
Coal bed gas is as follows with the concrete operations of well flow string G.I.H with sandstone gas:
S11, connector 1, one 5, safety valve 6 of giving up, sliding bush apparatus 7, envelope are sequentially connected in 2 lower end of outer layer coiled tubing
Every conventional tools such as device 8, sieve blanking plugs 1, after tool length is compound, coiled tubing 2 and the above-mentioned tool of connection are taken in
In lubricator, lubricator and well head are then connected；
S12, each manifold and gate are examined successively, confirm it is errorless after, start tripping in tool at this time；
After S13, tool tripping in predetermined depth, start suspension and half Feng Gongneng of four ram preventers, by coiled tubing 4
It is suspended on well head, after confirmation preventer is partly sealed sealing lattice, well head pressure release cuts continuous pipe using shear ram；
S14, injection head is removed, finishing and straightening processing is carried out to coiled tubing pipe end at well head, pipe end after conditioning
Installation connecting element and Yuan Jing " peckled turnip ", for coiled tubing to be fixed on well head；
Coiled tubing on S15, injection head also carries out finishing and straightening processing, while installing lubricator additional under blowout prevention box,
It will be fed into tool and " peckled turnip " and complete tieback in well head；
S16, crane slowly transfer injection head and connect lubricator with well head, close preventer suspension and half Feng Gongneng,
Slowly lower coiled tubing, is fully seated within " peckled turnip " in tubing head；
S17, it is pumped in coiled tubing arrival end, while slowly playing coiled tubing, coiled tubing suspending weight is illustrated as without increase
Function is given up, and is closed wellhead sluice valve, is taken out running tool after well head pressure release；
S18, wellhead sluice valve is opened, is slowly pumped to well head coiled tubing, first sets packer 8, packer 8 is set simultaneously
After testing sealing lattice, continue to be pumped, pressure reaches the setting value of sieve blanking plug 1, and blanking plug 9 falls off at this time, coal seam 12 and outer
Layer coiled tubing 2 is connected to；
Steel ball 71 is put into S19, outer layers coiled tubing 2, and 1 lower end of internal layer coiled tubing is then sequentially connected following work
Tool: connector 2 13,2 14, sieve blanking plug 2 15 of giving up repeat step S13-S17, finally complete internal layer coiled tubing 1
Shearing and fixed work, that is, complete the work of flow string G.I.H.
After flow string tripping in, start to go into operation, operation concrete operations are as follows:
(1) producing initial stage, coal bed gas arrange with sandstone gas point, divide and adopt
After flow string G.I.H, start to go into operation, while opening the gate valve A, gate valve B, gate valve C on ground, sandstone gas by
First annular space flow to ground and enters air accumulator；Gas is injected to the second annular space using air compressor machine or directly utilizes storage
Sandstone gas in gas tank carries out gas lift liquid drainage to coal seam, and fluid flow to ground from internal layer coiled tubing, then by ground gas-liquid
Separator isolates gas and water, and gas enters air accumulator again；Entire gas lift liquid drainage process, bottom pressure are opened lower than safety valve
Pressure is opened, gas realization recycles；The yield of sandstone gas is controlled by first annular space well head pressure；The lifting rate in coal seam
It is controlled by gas injection rate, realizes the control to pit shaft liquid level, reach the fine drain in coal seam.When strata pressure reaches the solution of coal bed gas
When suction pressure power, coal bed gas is gradually desorbed from coal seam, has a small amount of gas output in the coiled tubing of inside.Two gas point are adopted flow chart and are seen
Fig. 4.
(2) enter production mid-term after, coal seam formed pressure drop funnel, coal bed gas from coal seam desorb output, at this time coal bed gas with
Sandstone gas is adopted with well point, and sandstone gas is produced by first annular space output, coal bed gas by internal layer coiled tubing or the second annular space
Out；If hydrops, closing gate valve A occur for first annular space during point adopting with well, coal bed gas stops production, using air compressor machine to
Second annular space injects gas or directly using the sandstone gas of output in air accumulator, opens pressure when bottom pressure is higher than safety valve
When power, safety valve is opened, and gaslift enters first annular space for hydrops gaslift to ground；After hydrops discharge, gate valve A is opened,
Coal bed gas and sandstone gas continue point to adopt.First annular space gas lift liquid drainage flow chart is shown in Fig. 5.
(3) enter the production later period, when coal seam pressure and sandstone differing pressure 1-2MPa, closing gate valve B, C, inner layer connect
Continuous oil pipe pump pressure, when the pressure on rigid ball top is higher than the shearing force of shear pin, pin is cut, and steel ball and internal layer circle fall off,
First annular space is connected to internal layer, outer layer coiled tubing, and sandstone gas close with coal bed gas and be adopted, and closes the gas adopted by the first ring
Shape space, the second annular space or internal layer coiled tubing output.The conjunction of two gas adopts flow chart and sees Fig. 6.
In conclusion a kind of coal bed gas of the present invention and sandstone gas solve coal bed gas with well flow string and recovery method
With sandstone gas with due to the two reservoir properties, exploiting interlayer interference problem caused by difference in well production process.
Although the embodiments of the present invention have been disclosed as above, but its is not only in the description and the implementation listed
With.It can be applied to various suitable the field of the invention completely.It for those skilled in the art, can be easily
Realize other modification.Therefore without departing from the general concept defined in the claims and the equivalent scope, the present invention is simultaneously unlimited
In specific details and legend shown and described herein.
Claims (8)
1. a kind of coal bed gas and sandstone gas are the same as well flow string characterized by comprising casing is coaxially set in casing
Outer layer coiled tubing and internal layer coiled tubing, outer layer coiled tubing lower end give up one by the connection of connector one, a lower end of giving up
It is sequentially connected safety valve, sliding bush apparatus, packer, sieve blanking plug one；Internal layer coiled tubing lower end is connected by connector two
Give up two, two lower ends connection sieve blanking plug two of giving up；
First annular space is formed between described sleeve pipe and outer layer coiled tubing, between outer layer coiled tubing and internal layer coiled tubing
Form the second annular space；Packer, which is located in first annular space in the wellbore to completely cut off sandstone and coal seam, to be separated；
The safety valve includes valve body, and valve body center opens up central passage that is coaxial with outer layer coiled tubing and being connected to, channel side
Wall surface opens up the stomata being connected to first annular space, the pneumatic valve member of setting in stomata；The pneumatic valve member includes being located at
Ball seat, ball, baffle and bar-spring in stomata, ball seat be located in stomata close to valve body central passage interior sidewall surface and with gas
The air inlet in hole is connected to, and movable ball is arranged on ball seat, and baffle is arranged for keeping out closure air inlet, ball front end in ball,
Bar-spring both ends are born against on the inside of the gas outlet of baffle and stomata；When the pressure in the second annular space is less than safety valve
When cracking pressure, under the action of bar-spring, ball is fitted closely in ball seat with ball seat inner wall, blocks the air inlet of stomata
Mouthful, air-tightness is good, completely cuts off first annular space and the second annular space completely；When the pressure in the second annular space reaches safety
When the cracking pressure of valve, for ball to moving in the middle part of stomata under the pressure effect in the second annular space, ball pushes baffle pressure
Contracting bar-spring, the fluid in the second annular space are flowed out from air inlet；The cracking pressure of safety valve is opened lower than sliding bush apparatus
Shaft bottom maximum pressure when opening pressure and being higher than gas lift liquid drainage；
The sliding bush apparatus includes outer layer cylinder, is close to outer layer cylinder inner wall face and inner layer cylinder is arranged, inner layer cylinder top is equipped with
Movable steel ball, steel ball can move up and down under the action of shaft bottom liquid buoyancy or borehole pressure；By cutting between two cylinders
It cuts pin to be fixedly connected, when the pressure on steel ball top is higher than the shearing force of shear pin, pin is cut, steel ball and internal layer circle
Cylinder slides downwards relative to outer layer cylinder.
2. coal bed gas as described in claim 1 and sandstone gas are the same as well flow string, which is characterized in that there are two the stomatas,
Two stomatas are symmetrically arranged at wall surface at left and right sides of valve body, the axis of the central axes of stomata perpendicular to valve body central through hole
Line.
3. coal bed gas as described in claim 1 and sandstone gas are the same as well flow string, which is characterized in that the outer layer cylinder with it is interior
The contact surface of layer cylinder is equipped with O-ring seals.
4. coal bed gas as described in claim 1 and sandstone gas are the same as well flow string, which is characterized in that the internal layer coiled tubing
Top is connected to the gate valve A for being located at ground, and second annular space is connected to the gate valve B for being located at ground, first annular space
It is connected to the gate valve C for being located at ground.
5. a kind of utilize recovery method of the coal bed gas with sandstone gas with well flow string as described in claim 1-4 any one,
It is characterized by comprising the following steps:
S1, by coal bed gas and sandstone gas with well flow string G.I.H
First by outer layer coiled tubing G.I.H, then tripping in internal layer coiled tubing；
S2, producing initial stage, coal bed gas arrange with sandstone gas point, divide and adopt
The gate valve A, gate valve B, gate valve C on ground are opened simultaneously, and sandstone gas flow to ground air accumulator by first annular space；Utilize sky
Press injects gas to the second annular space or directly carries out gas lift liquid drainage to coal seam using the sandstone gas of air accumulator output, whole
A gas lift liquid drainage process, bottom pressure are lower than opening pressure of safety valve, and the liquid that gaslift goes out is by ground gas and water separator reality
It now separates, isolated sandstone gas enters air accumulator, realizes that gas recycles；
S3, into after production mid-term, coal bed gas desorbs output from coal seam, and coal bed gas and sandstone gas divide with well to be adopted；
S4, into production the later period, closing gate valve B, C, inner layer coiled tubing pump pressure, cut pin, steel ball and inner layer cylinder
It falls off, first annular space is connected to internal layer, outer layer coiled tubing, and sandstone gas close with coal bed gas and be adopted.
6. utilizing coal bed gas and sandstone gas with the recovery method of well flow string as claimed in claim 5, which is characterized in that institute
Stating step S1 includes following operation:
S11, be sequentially connected following tool in the lower end of outer layer coiled tubing: connector one, one, safety valve of giving up, sliding bush apparatus,
Packer, sieve blanking plug one connect lubricator and well then by outer layer coiled tubing and the tool of lower end income lubricator
Mouthful；
S12, each manifold and gate are examined successively, confirm it is errorless after, start tripping in tool at this time；
After S13, tool tripping in predetermined depth, start suspension and half Feng Gongneng of four ram preventers, by outer layer coiled tubing
It is suspended on well head；After confirmation preventer is partly sealed sealing lattice, coiled tubing is cut in well head pressure release；
S14, injection head is removed, outer layer coiled tubing pipe end at well head is modified, aligned, and is solid by oily pipe fixing device
It is scheduled on well head；
Outer layer coiled tubing on S15, injection head also carries out finishing and straightening processing, while installing lubricator additional under blowout prevention box,
It will be fed into tool and oily pipe fixing device and complete tieback in well head；
S16, crane slowly transfer injection head and connect lubricator with well head, close preventer suspension and half Feng Gongneng, slowly
Lower outer layer coiled tubing, is fully seated within oily pipe fixing device in tubing head；
S17, it is pumped in outer layer coiled tubing arrival end, while slowly playing outer layer coiled tubing, outer layer coiled tubing suspending weight is without increasing
Add and illustrate successfully to give up, closes wellhead sluice valve, take out running tool after well head pressure release；
S18, wellhead sluice valve is opened, is slowly pumped to well head outer layer coiled tubing, first by packer setting, packer setting is simultaneously tested
After sealing lattice, continue to be pumped, when pressure reaches the setting value of sieve blanking plug one, sieve blanking plug one falls off, coal seam and outer layer
Coiled tubing connection；
Steel ball is put into S19, outer layers coiled tubing, internal layer coiled tubing lower end is then sequentially connected following tool: connection
Device two, two, sieve blanking plug two of giving up repeat step S13-S17, complete the shearing and fixed work of internal layer coiled tubing.
7. utilizing coal bed gas and sandstone gas with the recovery method of well flow string as claimed in claim 6, which is characterized in that institute
It states in step S2, the yield of sandstone gas is controlled by first annular space well head pressure；The lifting rate in coal seam passes through gas injection rate control
System realizes the control to pit shaft liquid level, reaches the fine drain in coal seam.
8. utilizing coal bed gas and sandstone gas with the recovery method of well flow string as claimed in claim 7, which is characterized in that institute
It states in step S3, if hydrops, closing gate valve A occur for first annular space during adopting with well point, coal bed gas stops production, utilizes
Air compressor machine injects gas to the second annular space or directly utilizes the sandstone gas of output in air accumulator, when bottom pressure is higher than safety
When valve opening pressure, safety valve is opened, and gaslift enters first annular space for hydrops gaslift to ground；After hydrops discharge, beat
Open a sluice gate valve A, coal bed gas and sandstone gas continue point to adopt.
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| CN201811398632.2A CN109372474B (en) | 2018-11-22 | 2018-11-22 | A kind of coal bed gas and sandstone gas are the same as well flow string and recovery method |
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| CN111894528B (en) * | 2020-08-31 | 2022-05-24 | 西南石油大学 | Coal measure stratum multi-gas combined mining and capacity replacing method |
| CN114412417B (en) * | 2020-10-28 | 2024-03-26 | 中国石油天然气股份有限公司 | Multi-stage coalbed methane combined production experimental device |
| CN113187448B (en) * | 2021-06-17 | 2022-08-23 | 中国石油化工股份有限公司 | Multi-coal-bed gas combined mining equipment |
| CN113389530A (en) * | 2021-08-04 | 2021-09-14 | 北京中海沃邦能源投资有限公司石楼分公司 | Two-gas simultaneous production pipe column for deep reservoir and ground flow |
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| CN201924839U (en) * | 2010-12-23 | 2011-08-10 | 中国石油天然气股份有限公司 | Once production tubular column |
| US20150096767A1 (en) * | 2013-10-07 | 2015-04-09 | Swellfix Bv | Single size actuator for multiple sliding sleeves |
| CN107313753B (en) * | 2017-07-24 | 2019-09-13 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of coal bed gas well point, which is adopted, separates pump and device |
| CN207093043U (en) * | 2017-08-15 | 2018-03-13 | 贵州省非常规天然气勘探开发利用工程研究中心有限公司 | Tubing string is adopted in a kind of coal bed gas and compact sandstone gas underground altogether |
| CN207296957U (en) * | 2017-08-30 | 2018-05-01 | 中联煤层气有限责任公司 | A kind of two gas are total to device for picking |
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