CN108060915A - The completion structure of decreasing water cut and increasing oil ability can be improved - Google Patents
The completion structure of decreasing water cut and increasing oil ability can be improved Download PDFInfo
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- CN108060915A CN108060915A CN201610976957.9A CN201610976957A CN108060915A CN 108060915 A CN108060915 A CN 108060915A CN 201610976957 A CN201610976957 A CN 201610976957A CN 108060915 A CN108060915 A CN 108060915A
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- 238000005516 engineering process Methods 0.000 description 30
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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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
-
- 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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in 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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/066—Valve arrangements for boreholes or wells in wells electrically actuated
-
- 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
- E21B43/02—Subsoil filtering
-
- 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
- E21B43/25—Methods for stimulating production
-
- 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
- E21B43/34—Arrangements for separating materials produced by the well
- E21B43/38—Arrangements for separating materials produced by the well in the well
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Details Of Valves (AREA)
Abstract
The invention discloses a kind of oil/gas well completion system for improving decreasing water cut and increasing oil ability, including：Completion pit shaft, the flow control filter of tripping in pit shaft, top hanging packer have been filled with continuous packer in whole annular spaces between the completion pit shaft borehole wall and the flow control filter of tripping in.Wherein flow control filter includes, with filtering function and the filter sheath of energy sand control and packer particle, there is guide layer between filter sheath and base tube, and guide layer is connected with flow control device, and the hole only connected on base tube with flow control device, other positions are all blind pipes.Flow control device is the water-sensitive type selectivity flow control valve being identified using water different from the sensivity feature of oil or gas.This oil/gas well completion system is capable of the circulating resistance of automatic selectivity increase water or closes the circulation passage of water, effective to improve decreasing water cut and increasing oil ability.
Description
Technical field
The present invention relates to a kind of completion structures for being used to that decreasing water cut and increasing oil ability can be improved in production sections of oil and gas wells realization, belong to
Oil and natural gas exploits field, which can effectively improve the decreasing water cut and increasing oil ability in oil/gas well production process.
Background technology
First, oil/gas well production needs water control technique
In petroleum industry field, the purpose of production of hydrocarbons well is provided to the crude oil in recovery of subterranean oil reservoir, keeps away as far as possible
The water turned up the soil in layer.But many oil/gas well especially horizontal wells, often water breakthrough is more early, and moisture content rises comparatively fast, seriously affects
The economic interests in oil field.Due to the difference of the geologic(al) factors such as sedimentation, diagenesis, cause along oil gas well shaft axial dispersion
Rate anisotropism is very strong.In addition formation oil and the viscosity of water often differ greatly, and water is caused often to be carried along the high stratum of permeability
It advances into pit shaft, and quickly fills with most of space of pit shaft, due to being influenced be subject to water, the oil production of oil-producing section significantly drops
It is low, the moisture content of oil/gas well production liquid is made significantly to raise, oil yield significantly declines.Water is often from certain point of pit shaft during this
Or certain section is partially into, other remaining sections often still oil-producing.To solve the above-mentioned problems, oil/gas well needs to control water, especially
Solve the problems, such as local water outlet.
In addition, in the recovery process of gas well, it is still a significant problem to go out water problems.If going out in a bite gas well
Water is more than the maximum carrying amount of gas, causes a large amount of ponding in shaft bottom, and ponding finally forms the water column of certain altitude, blocks up in the wellbore
The output of natural gas is filled in.
In order to understand fully the mechanism of oil/gas well water outlet, applicant has done substantial amounts of Theoretical and Experimental Study.Since 2008
Applicant just starts to establish water output mechanism and water control method comprehensive experimental device in the lab, come study the mechanism of water outlet and its
Solution method.
Such as the production section of certain oil/gas well is 300 meters, 30 meters of the production segment length of high permeability, remaining 270 meters are hypotonic life
Section is produced, ground interlayer permeability differs 6 times, and the ratio of viscosities of the grease in stratum differs 100 times, theoretically derives, when water flooding edge
The high stratum of permeability in advance into after pit shaft, and the moisture content of the production liquid of the well can rise rapidly, be up to 98%.
In order to verify the theory deduction as a result, applicant has built a simulator, experimental provision in the lab
Photo is specifically shown in Fig. 1,20 meters of long simulation wellbore holes (1), and perpendicular to pit shaft (1) and the fill out sand tube (2) of reservoir sand is filled up with 10
10 sections of stratum of simulation are connected with pit shaft (1).
Detailed realization device schematic diagram is shown in Fig. 2, it can be seen that in 20 meters of long simulation wellbore holes (1), is not had by 10 sections
Have common screen casing (3) completion of flow control function, 10 perpendicular to pit shaft (1) fill up reservoir sand fill out sand tube simulate 10 sections of stratum with
Pit shaft (1) connects, wherein have 9 sections of low permeability formations (4), 1 section of high-permeability reservoir (5), and the permeability on hypertonic stratum is low
Ooze 6 times of stratum.9 sections of low permeability formations (4) inject oil to simulate oil-producing by oil pump (6), and 1 section of high-permeability reservoir (5) is by water pump
(7) Fluid Dynamics production water is injected, each section of fill out sand tube (2) perpendicular to pit shaft is monitored with pit shaft (1) junction by pressure gauge (8),
And connected between pit shaft fill out sand tube (2) by axial fill out sand tube (9), for simulate fluid in the earth formation it is axial around
Stream.
Wherein viscosity ratio of oil and water used in experiment is 100: 1, then observes the ratio of product fluid grease in pit shaft.Experiment well
In well, when producing water for hypertonic section, water, 90% stratum oil-producing are produced in only 10% stratum, and well head moisture content is up to 96%, oil-containing
Rate only has 4%.Applicant illustrates explanation from experimental result and the result of theory analysis for the first time, it was found that oil/gas well part water outlet
Harmfulness and seriousness.Although local water outlet causes oil gas field moisture content and rises rapidly, economic interests are influenced, simultaneously
Huge market prospects are brought to oil/gas well water control technique.If can control local EXIT POINT or water exit end, pit shaft is still
So there are a large amount of remaining production sections that can continue oil-producing, fuel-displaced to have a high potential, oil field control water is significant.
2nd, flow control filter for installation
In order to solve the rapid increase that local water outlet causes oil/gas well moisture content, EXIT POINT or water exit end limited or completely
It prevents, but in order to not influence the yield of oil, other oil-producing sections cannot be limited.Flow control filter for installation is that one of which solves
Scheme, the device is in the field of business to be also tended to be referred to as flow control screen casing or ICD (Inflow Control Device volume control devices)
Screen casing etc., collectively referred to herein as flow control filter.Flow control filter interior is base tube, has been set on base tube with filtering function
And the filter sheath set of energy sand control, there is guide layer between filter sheath and base tube, guide layer is connected with flow control device, on the base tube of screen casing
The hole only connected with flow control device, other positions are all blind pipes, and liquid flows into guide layer, then after filter sheath filters
Enter using flow control device in screen casing pipe, liquid outflow screen casing route with flow into route on the contrary, wherein outside filter sheath
Can prevent the formation particles such as gravel enter flow control device block fluid by passage.This flow control device is generally all using spray
Nozzle type, channel-style and orifice plate type etc., currently used is nozzle type.When fluid enters flow control filter, have to the water of high flow rate
Restriction effect does not influence the flowing of oil substantially.
Still to produce section as 300 meters, 30 meters high of production segment length of permeability, ground interlayer permeability differs 6 times, in stratum
Grease ratio of viscosities differ 100 times of oil/gas well exemplified by.Water flow velocity can be limited to original 1/20 by flow control filter, by
Slower in the flowing velocity of oil itself, unaffected, the moisture content of oil/gas well can be reduced to 73% at this time.Flow control filter for installation
Moisture content is reduced 25 percentage points.
3rd, packing flow control technology (also referred to as continuous packer sectional flow control technology) is partly oozed
Partly ooze packing flow control technology be solves the problems, such as water flowed along pit shaft is axial present in a kind of potential technology (or grinding
Technology).Applicant carried out the long-term researchs for partly oozing packing flow control technology, are altered with solving oil gas well control water aspect in the presence of axial
The problem of stream.
It is the first tripping in flow control filter tubing string into oil/gas well partly to ooze packing flow control technology, in flow control filter tubing string and well
There are annular space, (annular space here is the annular space of broad sense, it not only includes flow control filter tubing string and outer tubing string or the borehole wall between wall
Between annular space, further include annular space between annular space between cemented laterite, old well screen pipe and the borehole wall, antipriming pipe and the borehole wall etc.), so
The pack grain medium into above-mentioned annular space again afterwards, and fill consolidation formation and partly ooze excluder ring.This excluder ring of partly oozing has axially
Flow resistance is very big, and the characteristic of Radial Flow resistance very little, does not influence to produce.Partly ooze excluder ring by oil/gas well axially packing into
Many relatively independent production sections are acted in conjunction with the axial flow control of flow control filter for installation.Refer to applicant's invention
Patent《There is the flow control filter tube column sectional flow control method for the oil/gas well for altering slot outside casing》(application number：
200910250790.8)、《A kind of flow control filter tube column sectional flow control method there are sand-proof pipe oil/gas well》(application number：
200910250792.7)、《A kind of flow control filter tube column sectional flow control method of oil/gas well there are antipriming pipe》(application number：
200910250793.1)。
It is above mentioned partly to ooze packing flow control technology, in the technical research in later stage, it has been renamed as continuous packer point
Section flow control technology.Therefore, this patent mention partly ooze excluder ring and partly ooze packing flow control technology, all rename as continuously insulating respectively
Body and continuous packer sectional flow control technology, forming the particle of continuous packer, we term it packer particles.
4th, continuous packer and flow control filter combination water control technique application
Flow control filter must be combined the flow control effect of competence exertion maximum with continuous packer.Applicant is in laboratory
In Successful tests cross the technology with Oil Field, and all achieve good effect.Experimental provision as shown in Figure 3
Continuous packer (10) is added in pit shaft, and changes common screen casing into flow control filter (11), other experiment conditions are kept with Fig. 2
Unanimously.Equally, when 1 section of hypertonic section of production water (5), 9 sections of hypotonic section of oil-producing (4), experiment measures pit shaft production liquid moisture content and is reduced to
51%, reduce 45 percentage points.The reason for water yield reduces：The corresponding flow control filter in water exit end stratum controls production water
Amount, gives one, water exit end stratum very big back pressure, and the pressure drop in water exit end stratum reduces, so that water yield reduces.A large amount of water
Radially controlled flow filter limitation, water can also channelling vertically, there is packer particle to limit water vertically outside flow control filter
Channelling, so that a large amount of water are limited in stratum.Since oil pumping pumpage is fixed, after water is controlled, water yield subtracts
After small, pumpage deficiency, it is necessary to which oil-yielding stratum increases oil pump capacity to meet pumpage requirement, so being produced while oil/gas well precipitation
Oil mass can accordingly increase, and corresponding moisture content can be greatly reduced.
The technology that continuous packer is combined with flow control filter is by applicant in the end of the year 2015 for the first time in Xinjiang oil field
The success of a bite horizontal well field test.The well is the old well of horizontal well of a bite bottom water sandstone oil reservoir, and moisture content rises since operation
Comparatively fast, by being up to 95% to moisture content in 2015.Period has also carried out chemical water shutoff operation twice, but decreasing water cut and increasing oil effect
Poor, the term of validity is short.In November, 2015 uses continuous packer and flow control filter combined technology control water, oil well after construction
Moisture content is reduced to 75%, and oil production increases above 5 times, and decreasing water cut and increasing oil effect is highly stable, by the end of in by the end of September, 2016,
Moisture content remains at 75%.
Above experiment and effect of field application shows：Flow control filter is true with the water control technique that continuous packer is combined
The purpose of oil/gas well precipitation can be played in fact.
5th, continuous packer with water control technique that flow control filter is combined there are the problem of
Although continuous packer achieves certain decreasing water cut and increasing oil with flow control filter technology in laboratory and Oil Field
Effect.Such as in laboratory during 10% stratum production water, which can enable the moisture content of oil/gas well production liquid be reduced to 51%, play
The effect of decreasing water cut and increasing oil, but still more than being water in the production liquid of half, it is necessary to further reduce water yield and raising
Oil increment.When applicant in the lab continue increase production water interval, as shown in figure 4, increase by one section of Thief zone production water section
(12), i.e. the stratum production water of simulation wellbore hole 20%, other conditions are consistent with Fig. 3, and continuous packer and control are used in pit shaft
Flow filter combined technology, the result that moisture content is measured in laboratory are 73%.Dewatering effect has certain decline, but still has big
The aquatic products of amount goes out.When continuing to increase production water section, as shown in figure 5, increasing the production water section (13) of one section of Thief zone, by the production of Thief zone
When water section increases to three sections, i.e. the stratum production water of simulation wellbore hole 30%, other conditions are consistent with Fig. 4, continuous packer and
Flow control filter combined technology can only be by moisture control 90% or so, and the water of effect control at this time effect is not just apparent.And
Xinjiang Oil Field can be reduced to 75% using the moisture content of oil/gas well after continuous packer and flow control filter, although comparing
Good effect is had been achieved for before the technology control water, but is also not reaching to optimal water content requirement, substantial amounts of water will produce
Go out, still the potentiality with further precipitation.
To find out its cause, the design principle of nozzle type flow control filter：It is oily by passing through flow control with water under equal-pressure-difference, allowing
The flow of filter is essentially identical.Since the corresponding water flow in the stratum of unit length in high water-cut well is generally very big, so
There is considerable restraint to the output of water, original 1/40 can be reduced to.The flow of oil is had little to no effect, so as to reduce oil gas
Well moisture content.But fuel-displaced flow and the identical characteristic of the flow of water outlet also bring very big problem：Due to oil gas to be ensured
The yield of well oil, maintains certain economic well-being of workers and staff, the filter set clocking requirement by flow cannot be too low, corresponding water outlet
The impossible very little of amount, so as to limit the control water effect of the technology.This is also although the technology plays certain control water effect,
But can not further decreasing water cut and increasing oil basic reason.
This limitation of flow control filter is brought to continuous packer with the technology that flow control filter is combined several
The problem of aspect：
1, oil/gas well production liquid in water content it is still higher, cause oil field water process costly.
2, if the output of water can be reduced further, then oily yield can further increase.
3, in some producing wells through multiple oil reservoirs, if wherein one or more layers water outlet, then the production water of the well
Amount can also higher.
In order to further reduce the water yield of oil/gas well, the recovery ratio in oil field is improved, continuous packer is made to be filtered with flow control
The decreasing water cut and increasing oil that the technology that device is combined plays bigger is acted on, it is necessary to use flow control filter more stronger than current flow control ability.
By improving the flow control device in flow control filter, realize further limiting on oil without influence on water, improve the increasing of its precipitation
Oily ability.
The content of the invention
In order to solve above-mentioned technological deficiency, the present invention proposes a kind of oil/gas well completion system for improving decreasing water cut and increasing oil ability
System, including：Completion pit shaft, the flow control filter of tripping in pit shaft, top hanging packer, the completion pit shaft borehole wall and tripping in
Flow control filter between whole annular spaces in be filled with continuous packer, wherein flow control filter includes having filtering function
And the filter sheath of energy sand control and packer particle, filter sheath cover and have guide layer between base tube, guide layer is connected with flow control device,
The only hole that is connected with flow control device on base tube, other positions are all blind pipes, it is characterised in that flow control device be using water not
The sensivity feature for being same as oil or gas is identified, and the circulation of the circulating resistance or closing water of energy automatic selectivity increase water is led to
The device in road, the device are water-sensitive type selectivity flow control valve.
The realization method of this water-sensitive type selectivity flow control valve is mainly the following：
The first subtracts stream valve for viscosity-sensitive type machinery runner, as shown in fig. 6, the device mainly includes fluid main channel
(14), secondary outlet (16) and flow restrictor (15).Wherein flow restrictor can be oil nozzle or other devices in the art.Stream
Amount limiter (15) main function is the relatively low fluid (water or gas) of permission viscosity by when fluid viscosity higher (oil)
Then it is prevented to pass through.The movement of current limiter depends on the viscosity of fluid in traverse member.When fluid viscosity is very low, current limliting
The resistance that device provides very little just enables flow through.The smaller water of viscosity or gas mainly pass through current limiter and primary flow channel at this time
(14) eddy current assemblies (17) are entered.Due to the presence of directed element (19), such as blade or groove etc., make into after eddy current assemblies
It can generate faster flowing velocity with spiral or centrifugal flow and flow through path (shown in dotted arrow), delay fluid entrance
The time of eddy current assemblies outlet (18), that is, water or gas is delayed to enter time or the flow of base tube.When fluid viscosity changes,
For example oil is into fashionable, since current limiter can generate larger Fluid pressure to the restriction effect of oil.The higher oil of viscosity will at this time
Enter eddy current assemblies (17) along time outlet (16) outflow traverse member.It will be along opposite flowing road by the fluid of secondary outlet (16)
Footpath (solid arrow) radial inflow eddy current assemblies outlet (18).Whirlpool is entered along primary flow channel (14) by flow restrictor on a small quantity
The oil of stream component (17) will not cause significant centrifugation stream or spiral flow in room.
Second is viscosity-sensitive type mechanical valve, as shown in fig. 7, the device mainly includes fluid inlet (20), cavity
(21), cavity (21) is mainly formed by removable valve block (24) and its moveable support (25).At the both ends of cavity (21)
There is exit passageway (23), be then connected by exporting (22) with base tube.Removable valve block (24) is moved through the technical field
The pressure that the fast fluid of bernoulli principle known to interior, i.e. flow velocity generates will die down.In the earth formation, viscosity is small under same pressure differential
Water or flow of air speed be generally higher than oil.The pressure generated when water or gas enter the device in float trap piece upper surface is less than
Lower surface, floating valve body rises under the action of pressure difference, to ingate at move, reduce the flow channel of water or gas, so as to
The water or gas of reduction flow into the amount of pit shaft.When oil stream is through the device, float trap piece declines, and increases flow channel, increases
Oil enters the amount of base tube.The device can be described as flow path adjustment type viscosity-sensitive type mechanical valve again.
The another kind of viscosity-sensitive type mechanical valve be designed as runner can closed type, the design utilize different viscosities fluid
(predominantly oil and water difference) generates the switch that pressure difference carrys out control valve by showing the difference of change in pressure drop after seepage flow body.
The device can avoid entering base tube less than the fluid (such as water) below design viscosity.Fluid F as shown in Figure 8 makees in pressure p 1
Enter under from reservoir by entrance, pressure becomes p2, wherein p1 ≈ p2.Most fluid F2 leaves appearance by exporting (28)
Device enters base tube.A small amount of fluid F1 into container (31), is then flowed by seepage flow body (porous channel) (26) by nozzle (27)
Enter in base tube.Fluid enters container (31), and pressure becomes p3 afterwards,.The back pressure that the pressure is mainly generated by oil after nozzle (27)
It determines.For example p1 is 1Mpa, fluid F is oil, and since the flow velocity of oil is slower, the flow by seepage flow body is smaller, makes nozzle (27)
The back pressure of generation is relatively small, i.e. p3 very littles, such as only 0.2Mpa.But the area of p3 effects is entire housing (30), and
P1 only acts on seepage flow body, and wherein seepage flow bulk area is only the 1/3 of entire housing.So the power that p1 acts on seepage flow body is more than
P3 acts on the power of housing, finally compresses spring, expands amounts of the fluid F2 by outlet (28), so as to increase oil production.Work as stream
When body F is water, it is assumed that p1 is still 1Mpa, since water is by the flow increase of seepage flow body, makes the back pressure that nozzle generates that can increase, i.e.,
P3 can increase, for example become 0.4Mpa, and the power that p1 acts on seepage flow body (26) is less than the power that p3 acts on housing (30), and p3 can be pushed away
Dynamic housing (30) moves up, and so as to block the entrance of water, only makes few part (3% or so) that can enter base by nozzle (27)
Pipe.
The third is electronic grease identification selection switch valve.As shown in figure 9, main device includes being provided with execution machine
Electrically operated valve (32), signal processor (33) and an electronic inductor (34) for structure, what power was installed on flow control device
The electric power that accumulator or the wire cable of connection provide, the electronic inductor can utilize the physics of grease and chemosensitivity special
Sex differernce identify by fluid be water or oil, the physics and chemical characteristic difference of this grease include density variation,
Electric conductivity difference and viscosity differences etc..When electronic inductor sense be water by when, which can be to signal processing
Device sends shutdown signal, and signal processor can pass through executing agency's automatic-closing valve of electrically operated valve upon receipt of the signal
Or valve is kept to be in, state is automatically closed；When electronic inductor sense be oil by when, which can be to signal
Processor sends opening signal, and signal processor can be automatically opened upon receipt of the signal by the executing agency of electrically operated valve
Valve keeps valve to be in opening state.Land cable connection provides electric power operation complexity, and especially cost is too high.If using
Storage battery power supply, since this flow control device is limited by battery capacity, after one or two years, battery capacity will exhaust, flow control
Device also just fails, the state that flow control device at this time is likely to be out, it may be possible to the state of pass, it all can not be further according to coming
To liquid property voluntarily change on off state, this for oil/gas well production harm it is very big；Since wellbore space memory is deposited
In packer particle, if directly tubing string extracted, it may be necessary to which the power more than hundred tons, scene can not achieve, then this control
Stream device, which also can not just take out, replaces battery, therefore the use of the flow control device just receives obstruction.In applicant laboratory
Study repeatedly, it was found that continuous packer can realize the row of returning, and running string first is docked with top packer, using above carrying or
Rotation is allowed to unseal, and then into pit shaft, drain is returned in filling, and packer particle is realized the row of returning back to ground by Xun Huan.
After the supplying cell electricity in the intelligent flow control screen casing of electric drive formula exhausts, the continuous packer of discharge can be returned, will be sieved
Pipe is pulled out, and after replacing battery, then again in lower going-into-well, refills continuous packer, continues to realize sectional flow control.
Three of the above water-sensitive type selectivity flow control valve is all the different designs according to oil and water sensitivity feature.Especially
First two water-sensitive type selectivity flow control valve is generally higher than water this characteristic with viscosity differences, using the viscosity of oil, after identifying water outlet
The circulating resistance of water can selectively be increased or close the device of the circulation passage of water.But the gas well for tapping natural gas, water
Viscosity compared to gas can bigger, flow control valve can allow water to reduce opening for natural gas by the way that natural gas is hindered to enter pit shaft
Adopt efficiency.In order to solve the problems, such as natural gas, the electronic inductor of electronic grease identification selection switch valve can be improved, made
It can utilize gas, the physics and chemosensitivities characteristic difference identification of water go out by fluid be water or gas, this air water
Physics and chemical characteristic difference include density variation, electric conductivity difference and viscosity differences.It is water when electronic inductor senses
By when, which can send shutdown signal to signal receiver, and signal receiver can lead to upon receipt of the signal
It crosses executing agency's automatic-closing valve of electrically operated valve or valve is kept to be in and state is automatically closed；When electronic inductor senses
Gas by when, which can send opening signal to signal receiver, and signal receiver is upon receipt of the signal
Valve can be automatically opened by the executing agency of electrically operated valve or valve is kept to be in opening state.This device is known as electronic gas
Water identification selection switch valve.
These four water-sensitive type selectivity flow control valves with continuous packer are combined, can further increase decreasing water cut and increasing oil
Effect, main cause are as follows：Theoretically, when production sections of oil and gas wells passes through the oil-water-layer of equal proportion length, i.e. oil-producing section and production
Water segment length is identical, and when grease differences in viscosity is 100: 1, oil/gas well moisture content can reach 99%.With conventional flow control filter knot
Preferable moisture content can be still not reaching to by oil/gas well moisture control to 80% by closing continuous packer sectional flow control technology
It is required that and if water layer length is longer than oil reservoir length, then the amplitude that production liquid moisture content can reduce can accordingly reduce, very
To being only capable of being down to 90%, dewatering effect is limited.
But after flow control filter and the packer combined technology with installation water-sensitive type selectivity flow control valve, with runner tune
Exemplified by nodal pattern viscosity-sensitive type mechanical valve.With under equal-pressure-difference, the flow that water passes through the flow control valve is only the 20% of oil, into pit shaft
Water flow can further reduce.Equally in case of above-mentioned grease section is identical, this water-sensitive type selectivity flow control valve
Flow control filter can be by the moisture control of oil/gas well below 45%, than using conventional flow control with packer combined technology
The moisture content of filter and the oil/gas well production liquid of continuous packing body technique reduces 35 percentage points more.Due to pumpage base of pumping
Originally it is fixed, after water yield reduces, pumpage deficiency, it is necessary to oil-yielding stratum increases oil pump capacity to meet pumpage requirement,
After this is also this technology precipitation, the reason for oil production can accordingly increase.
If further improving flow control ability, can use runner can closed type viscosity-sensitive type mechanical valve, it can
The passage of water is selectively closed according to the viscosity differences of grease, minimal amount of water is only allowed to pass through.The flow control filtering of the valve is installed
Device combine continuous packing body technique oil/gas well can be produced liquid moisture content it is minimum drop to 5%, than using conventional flow control filter
75 percentage points are reduced with reference to the moisture content of the oil/gas well production liquid of continuous packer sectional flow control technology more.
Compared to the mechanical valve of viscosity-sensitive type, may be subject to for the crude oil Use Limitation fruit that viscosity is not much different with water
Certain limitation.Electronic grease identification selection switch valve can more accurately distinguish grease, and water stream channel is automatically closed.Profit
The technology of continuous packer is combined with electronic grease identification selection on-off valve control flow filter to produce containing for liquid by oil/gas well
Water rate is minimum to drop to less than 2%, than the moisture content for using conventional flow control filter and the oil/gas well production liquid of continuous packing body technique
Reduce 78 percentage points more.
In order to further improve the dewatering effect of oil/gas well, the present invention proposes a kind of oil for improving decreasing water cut and increasing oil ability
Gas well completion system, including：Completion pit shaft (including uncased wellbore), the flow control filter of tripping in pit shaft, top suspension packing
Device has been filled with continuous packer in whole annular spaces between the completion pit shaft borehole wall and the flow control filter of tripping in, special
Sign is that flow control filter includes the filter sheath with filtering function and energy sand control, has guide layer between filter sheath and base tube, leads
Fluid layer is connected with flow control device, and the hole only connected on base tube with flow control device, other positions are all blind pipes.
The pit shaft of completion of the present invention includes barefoot completion pit shaft, well-case perforating completion pit shaft, sieve tube completion pit shaft
With antipriming pipe completion pit shaft.Whole annular spaces between the borehole wall of completion pit shaft and the flow control filter of tripping in press different completions
Form there are one or two annular space or can alter slot.There are one between the borehole wall of barefoot completion pit shaft and the flow control filter of tripping in
A annular space；There are an annular space between the borehole wall of well-case perforating completion pit shaft and the flow control filter of tripping in, water of cementing the well outside casing
Mud underfill and existing alter slot；There are two annular spaces between the flow control filter of the borehole wall of sieve tube completion pit shaft and tripping in,
The annular space between annular space and flow control filter and screen casing i.e. between screen casing and the borehole wall；The borehole wall of antipriming pipe completion pit shaft under
There are two annular spaces between the flow control filter entered, i.e., the annular space between antipriming pipe and the borehole wall and flow control filter and antipriming pipe it
Between annular space.
Flow control device of the present invention is to be different from oily or gas sensivity feature using water to be identified, and can be certainly
Dynamic selectivity increases the circulating resistance of water or the device for the circulation passage for closing water, is known as water-sensitive type selection flow control valve, including viscous
Degree sensibility machinery runner subtracts stream valve, viscosity-sensitive type mechanical valve (flow path adjustment type and can closed type), electronic grease identification choosing
Select switch valve, electronic Gas water identification selective switch valve.
After packer grain packing, the filter sheath on flow control filter can prevent particle from entering.In filling packer
Largely using flow pack liquid in particle, annular space of the fluid outside screen casing enters flow control filter, then by connection tubing string
Return to ground.If flow control filter is excessive to the flow resistance of water or complete prevention, stowing operation just can not be completed.Continuous envelope
Spacer technology used be equipped with water-sensitive type selection flow control valve flow control filter after, due to water-sensitive type selection flow control valve be all
After meeting water, the circulating resistance that can improve water automatically even directly closes the circulation passage of water, therefore packer filling just can not be straight
It connects and water or aqueous solution is used to carry liquid as packer particle.In order to solve this problem, the present invention proposes two kinds of packings
Body placement method, first, packer particle is carried liquid and is replaced using oil or the guanidine glue with certain viscosity and polymer solution；
Second, one group of overflow means for being used for packer stowing operation in parallel, the device are filled in packer simultaneously on flow control filter
When be kept open, packer filling after can close, mainly include two kinds of solutions：One kind is in flow control filter
On be installed in parallel sliding sleeve, this is arranged to opening state before sliding over well, packer fill after, reuse sliding sleeve switch
Instrument closes all sliding sleeves.Another solution is to be installed in parallel one on flow control filter to set in flow channels
The rubber bar of oil expansion is met, the overflow means of abbreviation self-expanding rubber type filling keep one between rubber bar and flow channels
A annular space, the filling flow that the area of passage of annular space can be as needed design, and after packer filling, are cycled into pit shaft
Oil makes oil swellable rubber stick fully expand, and rubber bar swells the original flow channels of rear enclosed.
Description of the drawings
The Experimental equipment photo of water outlet when simulation water horizontal well produces in Fig. 1 laboratories.
The experimental provision signal of 10% formation water output when the horizontal well production of common sieve tube completion is simulated in Fig. 2 laboratories
Figure.
Simulated in Fig. 3 laboratories continuous packer with flow control filter be combined completion 10% formation water output of horizontal well and
Control the experimental provision schematic diagram of water effect.
Simulated in Fig. 4 laboratories continuous packer with flow control filter be combined completion 20% formation water output of horizontal well and
Control the experimental provision schematic diagram of water effect.
Simulated in Fig. 5 laboratories continuous packer with flow control filter be combined completion 30% formation water output of horizontal well and
Control the experimental provision schematic diagram of water effect.
Fig. 6 is the schematic device that viscosity-sensitive type machinery runner subtracts stream valve.
Fig. 7 is the schematic device of flow path adjustment type viscosity-sensitive type mechanical valve.
Fig. 8 is the schematic device of runner closed type viscosity-sensitive type mechanical valve.
Fig. 9 is the schematic device of electronic grease identification selection switch valve.
Figure 10 be mounted with viscosity-sensitive type machinery runner subtract stream valve flow control filter be combined with continuous packer it is complete
Well system application schematic diagram in open hole well.
Figure 11 is mounted with what the flow control filter of runner closed type viscosity-sensitive type mechanical valve was combined with continuous packer
Completion system application schematic diagram in well-case perforating well.
Figure 12 is mounted with the completion that the flow control filter of electronic grease identification selection switch valve is combined with continuous packer
System application schematic diagram in tripping in screen casing well.
Specific embodiment
Embodiment 1
The present invention provides a kind of oil/gas well completion system for improving decreasing water cut and increasing oil ability, and the completion system is in open hole well
It is as shown in Figure 10 during implementation, including：8-1/2 " open hole walls (36), the flow control filter (37) of tripping in, top suspension packing
Device (38) is filled with continuous packer (39) in the annular space between the flow control filter of the borehole wall and tripping in.Flow control filter bag
The filter sheath with filtering function and energy sand control is included, there is guide layer between filter sheath and base tube, guide layer is connected with flow control device,
The hole only connected on base tube with flow control device, other positions are all blind pipes, and wherein flow control device is viscosity-sensitive type mechanical flow
Road subtracts stream valve, the sliding-sleeve nipple (40) for filling in parallel on the flow control filter.First in 8-1/2 " bore holes during filling construction
The flow control filter (37) of pit shaft (36) tripping in 5-1/2 " is sat to top packer (38) during precalculated position under flow filter to be controlled
Continuous packer (39), is then filled in the annular space between the borehole wall and the flow control filter of tripping in by envelope with packing tool,
It is turned off with sliding sleeve switch instrument after filling.
Embodiment 2
The present invention provides a kind of oil/gas well completion systems for improving decreasing water cut and increasing oil ability, and the completion system is in tripping in
It is as shown in figure 11 when implementing in cased well, including：The Wall of Cased Hole (41) of perforation, casing it is outer due to horizontal segment cementing quality not
Exist well and alter slot (42), tripping in flow control filter (44), casing filter top hanging packer (43) with flow control again in casing
Continuous packer (45) has been filled in interior space including altering slot outside annular space and casing between device.Flow control filter includes tool
There is the filter sheath of filtering function and energy sand control, have guide layer between filter sheath and base tube, guide layer is connected with flow control device, base tube
The upper hole only connected with flow control device, other positions are all blind pipes, and wherein flow control device is runner closed type viscosity-sensitive type
Mechanical valve.The self-expanding rubber type filling overflow means (46) for filling in parallel on flow control filter, are first penetrated in 5-1/2 "
The flow control filter (44) of tripping in 2-7/8 " in hole sleeve (41), to top packer during precalculated position under flow filter to be controlled
(43) set, annular space and the casing outsourcing being then filled to continuous packer with packing tool between casing and flow control filter
It includes and alters slot in interior annular space, steep rubber with oil immersion after filling, it will be for the overcurrent of packer stowing operation after rubber swelling
Device is closed.
Embodiment 3
The present invention provides a kind of oil/gas well completion systems for improving decreasing water cut and increasing oil ability, and the completion system is in tripping in
It is as shown in figure 12 when implementing in the well of screen casing, including：8-1/2 " the open hole wells borehole wall (47), tripping in 5-1/2 " sand screens in pit shaft
Pipe completion (48), top hanging packer (49), tripping in flow control filter (50), then fills packer (51) in pit shaft,
In annular space between the water-sensitive type flow control screen casing of annular space and sand control screen and tripping between the borehole wall and sand control screen all
It is filled with continuous packer.The flow control device of the flow control filter is electronic grease identification selection switch valve, and power supply is
Battery.The electronic grease identification selection switch valve is set on reaching filling requirement in filling, after the completion of filling at one section
Between, such as 3 days, it is adjusted to the production status that can be identified grease and can close., first by screen casing (48) perforation (52) of 5-1/2 ",
Then the flow control filter (50) of tripping in 2-7/8 " in the wellbore is sat to top packer during precalculated position under flow filter to be controlled
It seals (49), then continuous packer (51) is filled to outside the annular space and casing between casing and flow control filter with packing tool
Including altering slot in interior annular space, electronic grease identification selection switch valve is adjusted to production status after filling.
After a period of time, because of the mistake of the battery term of validity in electronic grease identification selection switch valve, flow control is caused to fill
Putting can not work normally.Deblocking packer returns drain from pit shaft direct circulation, and packer particle is returned discharge well head, extracts flow control
Filter tubing string, the battery in replaced on ground flow control device.
Claims (14)
1. a kind of oil/gas well completion system for improving decreasing water cut and increasing oil ability, including：Completion pit shaft, the flow control mistake of tripping in pit shaft
Filter, top hanging packer are filled in whole annular spaces between the completion pit shaft borehole wall and the flow control filter of tripping in
Continuous packer, wherein flow control filter include with filtering function and can sand control and packer particle filter sheath, filtering
There is guide layer between set set and base tube, guide layer is connected with flow control device, the hole only connected on base tube with flow control device, other
Position is all blind pipe, it is characterised in that flow control device is to be different from oily or gas sensivity feature using water to be identified, and
Energy automatic selectivity increases the circulating resistance of water or closes the device of the circulation passage of water, which is water-sensitive type selectivity flow control
Valve.
2. a kind of oil/gas well completion system for improving decreasing water cut and increasing oil ability as described in claim 1, which is characterized in that described
Water-sensitive type selectivity flow control valve subtract stream valve for viscosity-sensitive type machinery runner.
3. a kind of oil/gas well completion system for improving decreasing water cut and increasing oil ability as described in claim 1, which is characterized in that described
Water-sensitive type selectivity flow control valve be viscosity-sensitive type mechanical valve.
4. a kind of oil/gas well completion system for improving decreasing water cut and increasing oil ability as claimed in claim 3, which is characterized in that described
Viscosity-sensitive type mechanical valve include flow path adjustment type and runner closed type.
5. a kind of oil/gas well completion system for improving decreasing water cut and increasing oil ability as described in claim 1, which is characterized in that described
Water-sensitive type selectivity flow control valve be electronic grease identification selection switch valve.
6. a kind of oil/gas well completion system for improving decreasing water cut and increasing oil ability as described in claim 1, which is characterized in that described
Water-sensitive type selectivity flow control valve be electronic Gas water identification selective switch valve.
7. such as claim 5, a kind of oil/gas well completion system for improving decreasing water cut and increasing oil ability described in 6, which is characterized in that institute
The electronic grease and air water identification selection switch valve stated, electric power transmit for the cable on ground to underground.
8. such as claim 5, a kind of oil/gas well completion system for improving decreasing water cut and increasing oil ability described in 6, which is characterized in that institute
The electronic grease and air water identification selection switch valve stated, electric power is the storage battery power supply for being carried to underground.
9. a kind of oil/gas well completion system for improving decreasing water cut and increasing oil ability as claimed in claim 8, which is characterized in that described
The substitute mode of underground accumulator be to return packer outside row's flow control filter by injecting liquid to flow control filter tubing string
Particle proposes ground from underground by flow control filter tubing string, is fed again into underground after replacing battery, fills packer to ground
Grain.
10. the oil/gas well completion system of decreasing water cut and increasing oil ability can be improved as described in claim 1, which is characterized in that described
Flow control filter is provided with for the overflow means of packer stowing operation.
11. the oil/gas well completion system of decreasing water cut and increasing oil ability can be improved as claimed in claim 10, which is characterized in that described
Overflow means are the overflow means that can be closed after a kind of packer fills.
12. the oil/gas well completion system of decreasing water cut and increasing oil ability can be improved as claimed in claim 11, which is characterized in that described
Overflow means for packer stowing operation are a kind of sliding sleeves closed using switching tools.
13. the oil/gas well completion system of decreasing water cut and increasing oil ability can be improved as claimed in claim 11, which is characterized in that described
Overflow means for packer stowing operation are a kind of overflow means that oil swellable rubber stick is provided in flow channels,
Rubber bar swells after being steeped with oil immersion closes flow channels.
14. the oil/gas well completion system of decreasing water cut and increasing oil ability can be improved as described in claim 1, which is characterized in that described
The continuous packer being filled in whole annular spaces between the completion pit shaft borehole wall and the flow control filter of tripping in is to pass through height
Viscosity carries liquid and completes filling.
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| CN108756831A (en) * | 2018-05-28 | 2018-11-06 | 中国海洋石油集团有限公司 | A kind of horizontal well control water completion structure of self-adaptation type |
| CN108825183A (en) * | 2018-09-04 | 2018-11-16 | 成都北方石油勘探开发技术有限公司 | A kind of horizontal well automatic control water completion tubular column structure |
| CN110424912A (en) * | 2019-08-06 | 2019-11-08 | 安东柏林石油科技（北京）有限公司 | Method, the row's of returning service unit and the completion structure of tubing string replacement filling layer are not changed |
| CN111119787A (en) * | 2019-11-28 | 2020-05-08 | 中国海洋石油集团有限公司 | Horizontal well stratum anti-channeling water control well completion structure |
| CN112483056A (en) * | 2020-12-10 | 2021-03-12 | 西南石油大学 | Device and method for predicting construction effect of continuous packer particle water control and oil increase site |
| CN113756759A (en) * | 2021-10-14 | 2021-12-07 | 中国石油大学(北京) | Test equipment and experimental system for sand prevention simulation of well completion engineering |
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