CN104989345B - A kind of recovery method of single horizontal well solvent auxiliary - Google Patents
A kind of recovery method of single horizontal well solvent auxiliary Download PDFInfo
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- CN104989345B CN104989345B CN201510324029.XA CN201510324029A CN104989345B CN 104989345 B CN104989345 B CN 104989345B CN 201510324029 A CN201510324029 A CN 201510324029A CN 104989345 B CN104989345 B CN 104989345B
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Abstract
The invention provides a kind of recovery method of single horizontal well solvent auxiliary.This method includes：Step one：The single branch horizontal well patterns of deployment, the horizontal segment of horizontal well is with oil reservoir bottom apart from ＜ 1m；Step 2：Under more than composite gas solvent dewpoint pressure, C is injected by long tube1‑C4Organic compound and CO2Composite gas solvent；Step 3：Closing well 12 days, is heated to the horizontal segment of horizontal well, when being heated to 50 70 DEG C, stops heating；Step 4：Using long tube with note thin oil, the mode that short tube recovers the oil is exploited, and extraction process continues two days, when the pressure of underground is less than 1MPa, and composite gas solvent, repeat step three are injected by long tube, and the injection rate of composite gas solvent is 13 times of solvent cavity volume；Step 5：The step 4 of repeat step two, when recovery percent of reserves reaches more than 50%, and production efficiency is less than economic limit, terminates exploitation.The individual well cost of the recovery method of the present invention is low, requires drilling technology low, anhydrous process and energy consumption is low.
Description
Technical field
The present invention relates to a kind of oil reservoir recovery method, the list of the less economical thin heavy oil of more particularly to a kind of thermal recovery
The recovery method of horizontal well solvent auxiliary, belongs to technical field of petroleum extraction.
Background technology
The development technique of the main flow of current oil reservoir is entered using exploitation via steam injection technologies such as steam soak, steam drive, SAGD
Row exploitation.
Wherein, SAGD develops viscous crude and achieves success in Canada, obtains business application.The country also begins to attempt, but has
A little applications are limited by the limitation of factors, the thickness of thin of such as oil reservoir, bury it is deep, containing edge-bottom water, cause that heat loss is big, exploitation speed
Degree is slow, oil-gas ratio is low, business efficiency is poor.
And dual horizontal well requires very high to wellbore trace, the depth of parallelism is poor, and the fluctuation of well spacing is big, has a strong impact on development effectiveness.
In addition, oil reservoir thermal communication and fluid communication need to consume substantial amounts of water and heat between SAGD startup stages, 5 meters of traditional wells,
And effect is not also fine.
The thickness of thin of oil reservoir, development rate is slow, and the oil reservoir development that oil-gas ratio is low, business efficiency is poor becomes oil reservoir development mistake
The problem commonly encountered in journey.
Therefore, solve that thin heavy oil thermal recovery heat loss is big, the problem high to well-drilling borehole track requirements is this area
Technical problem urgently to be resolved hurrily.
The content of the invention
In order to solve the above-mentioned technical problem, the invention provides a kind of recovery method of single horizontal well solvent auxiliary, this is opened
The advantage for giving full play to horizontal well gravity drainage is adopted, viscous crude is effectively employed using the mode of organic solvent huff and puff oil recovery, with list
Well cost is low, and low, anhydrous process and the low advantage of energy consumption are required to drilling technology.
In order to achieve the above object, the invention provides a kind of recovery method of single horizontal well solvent auxiliary, the exploitation side
Method comprises the following steps：
Step one：The single branch horizontal well patterns of deployment, the horizontal segment of horizontal well is with oil reservoir bottom apart from ＜ 1m；
Step 2：Under the pressure more than dew-point pressure, C is injected by long tube1-C4Organic compound and CO2Compound gas
Body solvent, the dew-point pressure is the dew-point pressure of composite gas solvent；
Step 3：Closing well 1-2 days, is heated to the horizontal segment of horizontal well, when being heated to 50-70 DEG C, stops heating；
Step 4：Using long tube with note thin oil, the mode that short tube recovers the oil is exploited, and extraction process continues two days, when underground
When pressure is less than 1MPa, the composite gas solvent, and the step of repetition step 3 are injected by long tube, wherein, composite gas
The injection rate of solvent is 1-3 times of solvent cavity volume；
Step 5：The step of repeat step two to step 4, when recovery percent of reserves reaches more than 50%, production efficiency is less than warp
During the limit of helping, terminate exploitation, complete the exploitation of single horizontal well solvent auxiliary.
In the above-mentioned recovery method that provides of the present invention, in step one, the horizontal segment of horizontal well and oil reservoir bottom away from
It is more economical from smaller, but if fixed too low of index, part of horizontal well well section can be caused to be in substrate rock stratum, to production not
With any effect, there is very high risk, general setting is less than 1 meter, and concrete numerical value those skilled in the art can be according to specific
Demand selects suitable distance.
In the above-mentioned recovery method that the present invention is provided, the solvent chamber in step 4 refers to the injection with solvent, injection
Part viscous crude above well is plucked out of, and the solvent that this segment space is subsequently implanted into is occupied, and our this segment space is called oil reservoir
The solvent chamber being internally formed.Solvent chamber constantly expands with the progress of development process.
In the above-mentioned recovery method that the present invention is provided, in step 5, when the solvent cost, equipment and operating cost of injection
Summation>Then production efficiency is less than economic limit during the output crude value estimated by current oil price, with an operation cycle
To assess basis.
In the above-mentioned recovery method of the present invention, it is preferable that in step 2, the C1-C4Organic compound includes first
One or more of combinations in alkane, ethane, propane and butane.
In the above-mentioned recovery method of the present invention, it is preferable that in step 2, CO in composite gas solvent2Volume contain
Measure as 20%-80%.
In the above-mentioned recovery method of the present invention, the content of carbon dioxide can be according to reservoir characteristic in composite gas solvent
Selected.The foundation of selection is：The dew-point pressure Proximity operation pressure of composite gas solvent but more lower slightly than operating pressure.So
Injecting the fluid of oil reservoir can enter in two-phase section (as shown in Figure 1), can guarantee that overwhelming majority injection solvent is in gas phase again, make
The consumption for obtaining composite gas solvent is few (density of gas phase is low), but pressure is again sufficiently high, beneficial to raising composite gas solvent in viscous crude
In solubility.
In the above-mentioned recovery method of the present invention, it is preferable that be provided with heater in the horizontal segment of horizontal well.Wherein,
The heater can be electric heater unit.
The present invention above-mentioned recovery method in, it is preferable that be provided with the horizontal segment of the horizontal well temperature measuring equipment and
Pressure tester, to implement the temperature and pressure in monitoring well.
In the above-mentioned recovery method that the present invention is provided, in the step 2, dew-point pressure refers to that gas phase hydrocarbon is pressurized
During keep the maximum pressure of single gas phase, be to change with the composition of reservoir temperature and composite gas solvent.Such as, 20 DEG C
Under, the dew-point pressure of composite gas solvent is 1.5-6MPa.Dew-point pressure is general higher than strata pressure, to ensure that composite gas are molten
Agent can be injected, but also will not be especially high, and otherwise uneconomical, those skilled in the art can be judged according to actual conditions.
In the above-mentioned recovery method of the present invention, the long tube of use is used for gas injection, and gas injection speed does not require high, long tube it is straight
Footpath is not specially required, typically using the oil pipe of common model, generally the oil pipe of 2 (7/8) in models.Short tube is used to adopt
Liquid, Produced Liquid is the mixture of viscous crude, solvent, thin oil, and extraction process is pumping, using the oil pipe of common model, typically
For the oil pipe of 2 (7/8) in models.
According to the embodiment of the present invention, in step 4, long tube is mainly with note thin oil prevents output crude oil from taking off
Viscosity significantly gos up after gas, and causes extraction pipeline to be blocked.The thin oil of use can be that the self-produced dehydration of the other blocks in oil field is low
Glutinous crude oil or viscous crude diluent, specifically to drop glutinous and cost control as selection gist.
In the above-mentioned recovery method of the present invention, the process that extraction process produces for decompression.
According to the embodiment of the present invention, when recovery percent of reserves reaches more than 50%, solvent naphtha ratio is substantially increased, output
Oil mass rapid decrease, and when causing production efficiency less than economic limit, terminate production.
The above-mentioned recovery method that the present invention is provided, it is main to include deployment well pattern, solvent injection, four ranks of immersion and extraction
Section；
The single branch horizontal well patterns of deployment, as flooding pattern, wherein, it is ensured that the horizontal segment of horizontal well and oil reservoir bottom
Distance<1 meter, heater built in horizontal well, for uniformly heating, tripping in temperature measuring point and pressure tap are used to monitor recovery process
Temperature and pressure；And in pit shaft tripping in screen casing, many tubing strings of tripping in (temperature tube, heating tubing string, long tube, short tube in screen casing
Deng), solvent injection stage long tube note double solvents, extraction stage long tube recovers the oil with note thin oil, short tube；
Injection stage, according to factors such as reservoir buried depth, pore pressure, formation temperatures, selects suitable composite gas solvent,
The duration of injection stage is short, starts most solvents in the short period of injection and smoothly enters, hereafter flow diminishes, and inhales
Solvent power of receiving is weak；Composite gas solvent injects more than dew-point pressure, ensures that solvent enters Gas-liquid phase region, now solvent
Consumption is small, while the enough height of pressure, the solubility in crude oil is big, high pressure injection solvent reaches the purpose of supplement stratum energy；
Injecting closing well after double solvents, for a period of time, into impregnation stage, soak time is slightly longer (to be averaged 1-2 days, depends on
Crude viscosity and oil-producing speed), predominantly high pressure solvent dissolving drop is glutinous, and foam oil is formed during decompression production.The shape in fill out sand tube
Into three characteristic areas, as shown in Figure 2；
The extraction stage is pressure reduction, foam oil (gravity influence is relatively very weak) output, companion in the presence of solvent gas drive
Decline with pressure, Crude viscosity rises, this process is by being depressured, and the mixture of crude oil and double solvents will form foam oil
Shape, in the presence of dissolved gas drive, the crude oil (foam oily) of solvent intracavitary is quickly pushed to stick after shaft bottom, shaft bottom crude oil deaeration
Degree gos up, and is now heated by injecting thin oil and shaft bottom, reduces its viscosity, then give rise to ground by crude oil by the way of pumping
Face.
The above-mentioned recovery method that the present invention is provided, the composite gas solvent used can be separated and recovered from, after pressurization
Recycle.
The recovery method of the present invention drops the processes such as glutinous, dissolved gas drive, gravity drainage, molecule thermal diffusion by solvent, to gulp down
The form told strengthens the extraction of viscous crude.Wherein, the solvent of injection is gas phase, it is easy to separated and recovered, and is recycled；Wherein, it is combined
The injection state of gas-solvent is located in two-phase section, close to dew point line, to improve composite gas solvent as far as possible in viscous crude
Solubility, while reducing its consumption；
In impregnation stage, solvent molecule enters in oil phase in the presence of thermal diffusion, and general diffusion depth is 2cm/d, non-
It is often slow.Under gravity, drop the viscous crude after sticking and slowly depart from oil phase, promote solvent-oil contact leading edge reach, compensate for molten
Solve the low deficiency of diffusion velocity；
The extraction stage produces for decompression, in pressure reduction, the gasification of operative liquid solvent, supplements driving force.In addition, dissolving
Solvent in viscous crude can form foam oil in decompression production, produce the stronger driving force to pit shaft.Shape under two kinds of mechanism
Into very big extraction driving force.
The above-mentioned recovery method that the present invention is provided is applied to the less economical thin layer super-heavy oil deposit of thermal recovery, and the exploitation
The energy consumption of method is low, and discharge is few, the rigors of unparalleled horizontal well drilling, it is easy to drilling completion；
The solvent for the above-mentioned recovery method that the present invention is provided can be recycled, and solvent consumption is few, and without emulsified water at
Reason problem, to big well barefoot completion, well pattern tubing string has no special requirements；
Oil production rate and UNICOM's speed greatly improved in sand producing well in the above-mentioned recovery method that the present invention is provided, and has
The interlayer of destruction horizontal distribution is hoped, in the case where process conditions allow, oil production rate can be greatly speeded up by taking sand oil recovery.
Brief description of the drawings
Fig. 1 is composite gas solvent phasor of the invention；
Fig. 2 handles up the comparison diagram of different phase for the solvent of the present invention.
Embodiment
In order to which technical characteristic, purpose and beneficial effect to the present invention are more clearly understood from, now to the skill of the present invention
Art scheme carry out it is described further below, but it is not intended that to the present invention can practical range restriction.
Embodiment 1
A kind of recovery method of single horizontal well solvent auxiliary is present embodiments provided, the recovery method specifically includes following step
Suddenly：
Oil reservoir and working condition：
250 meters of oil reservoir depth, effective 10 meters of oil reservoir height, reservoir porosity is 30%, and permeability is 5 darcies, and 50 DEG C take off
Gas crude oil viscosity is 50000mPaS, 22 DEG C of formation temperature.Horizontal well is located at more than oil reservoir bottom at 1 meter.Horizontal section length is
400 meters, well spacing is 70 meters, and borehole diameter is 8.5in.7in cutting seam sieve tube completions, prevent horizontal well sand producing well.In screen casing
The interior long and short oil pipe of tripping in, tubing diameter is 27/8in.Wherein, short tube end connection sucker rod pump, long pipe end is from horizontal well tiptoe
At 5-10 meters.In addition, in screen casing tripping in coiled tubing thermometric, along horizontal segment arrange electric heater unit.
It is 3-4MPa first according to oil reservoir pore pressure, fracture pressure selection operation pressure limit.It is molten according to indoor viscous crude
Agent optimal screening is tested, and obtains the phasor of solvent, and be used as compound gas using the mixed solvent of the carbon dioxide of 25% propane+75%
Body solvent, confirms that mixed solvent is located at two-phase section at 22 DEG C, and dew-point pressure is 3.2MPa, and design injection pressure is 3.5MPa.
The good composite gas solvent of live mixed preparing, plus back pressure is to 8.5MPa, it is ensured that all solvent liquefactions, then open
Long tube valve is slowly injected into stratum, can so ensure to inject the concentration composition composite design of solvent and constant.Observe well head pressure
Power react, when stop after pressure Proximity operation pressure note, and immersion a few hours backsight pressure decline situation supplement injection it is a certain amount of
Solvent.The injection rate of solvent is increased with the continuous extraction of crude oil, the continuous expansion of solvent chamber.Assuming that solvent chamber is sent out
It is bred as equilateral triangle and height is for 5 meters of solvent chamber, its volume is 5773.3m3, inject solvent and be estimated as
14433.3m3(under normal temperature, the standard state of atmospheric pressure).
Closing well is soaked 1 day, and the viscous crude after drop is glutinous is leaked into pit shaft under gravity.Underground heater is opened (to rise and add
Glutinous and supplement pressure the effect of heat drop), heating and temperature control monitors down-hole pressure change at 50-70 DEG C, with pressure higher than dew
Point pressure but it is advisable less than bubble point pressure.
The dehydration thin oils of the other block outputs in oil field is slowly injected into out of long tube, and (injection rate will be mixed depending on thinning effect
Enter thin oil 5-10wt% and can reach preferable thinning effect), and recovered the oil from short tube pumping, because pressure reduction is along with slow
The process that balances each other, the process will typically continue 2 days or so.Down-hole pressure fall off rate is designed accordingly for 1.25MPa/d, and phase
Working conditions of oil extractor (stroke and frequency) should be set.
To extraction fluid decompression gas-liquid separation, vapor phase solvent is reclaimed.The solvent of collection is sent to after pressue device pressure-raising
Store standby in high pressure piston container.Repeat above step.
By the above-mentioned recovery method well after 120 cycles of experience totally 360 days note solvent operations, recovery percent of reserves 37%,
Common property goes out 18648 tons of crude oil, equivalent to 51.8 tons of day oil-producing.Solvent recovering rate reaches 75%, peak value monocycle mixed solvent note
Enter amount for 833.3m3, thin oil consumption is 1865 tons.
Claims (5)
1. a kind of recovery method of single horizontal well solvent auxiliary, the recovery method comprises the following steps：
Step one：The single branch horizontal well patterns of deployment, the horizontal segment of horizontal well is with oil reservoir bottom apart from ＜ 1m；
Step 2：Under the pressure more than dew-point pressure, C is injected by long tube1-C4Organic compound and CO2Composite gas it is molten
Agent, the dew-point pressure is the dew-point pressure of composite gas solvent, and the injection rate of composite gas solvent is the 1-3 of solvent cavity volume
Times；
Step 3：Closing well 1-2 days, is heated to the horizontal segment of horizontal well, when being heated to 50-70 DEG C, stops heating；
Step 4：Using long tube with note thin oil, the mode that short tube recovers the oil is exploited, and extraction process continues two days, when the pressure of underground
During less than 1MPa, the step of composite gas solvent, repeat step three are injected by long tube, wherein, composite gas solvent
Injection rate is 1-3 times of solvent cavity volume；
Step 5：The step of repeat step two to step 4, when recovery percent of reserves reaches more than 50%, production efficiency is less than economic pole
In limited time, terminate exploitation, complete the exploitation of single horizontal well solvent auxiliary.
2. recovery method according to claim 1, wherein, in step 2, the C1-C4Organic compound include methane,
One or more of combinations in ethane, propane and butane.
3. recovery method according to claim 1, wherein, in step 2, CO in composite gas solvent2Volume content
For 20%-80%.
4. recovery method according to claim 1, wherein, it is provided with heater in the horizontal segment of the horizontal well.
5. recovery method according to claim 1, wherein, it is provided with temperature measuring equipment and survey in the horizontal segment of the horizontal well
Pressure device.
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| CA2584712A1 (en) * | 2007-04-13 | 2008-10-13 | Nexen Inc. | Methods of improving heavy oil production |
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