CN107558950A - Orientation blocking method for the closing of oil shale underground in situ production zone - Google Patents
Orientation blocking method for the closing of oil shale underground in situ production zone Download PDFInfo
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- CN107558950A CN107558950A CN201710822629.8A CN201710822629A CN107558950A CN 107558950 A CN107558950 A CN 107558950A CN 201710822629 A CN201710822629 A CN 201710822629A CN 107558950 A CN107558950 A CN 107558950A
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Abstract
The invention discloses a kind of orientation blocking method for the closing of oil shale underground in situ production zone, is exploited suitable for the oil shale in-situ of different buried depths, different geological environments, is also applied for the in-situ retorting of coal, viscous crude etc..Lid method is in the oil shale in-situ productive formation of pressure break, orients slip casting and areal pressure guard method using existing well, does not influence production zone fisstured flow characteristic, form the in-situ retorting target area of closing.Avoid underground water influences pyrolytic process into production zone, and has just exempted from water environment and geological environment outside oil gas product and the outside diffusion pollution region of pollutant.
Description
Technical field
The present invention relates to a kind of orientation blocking method for the closing of oil shale underground in situ production zone, can be widely used for
Need in the solid of production zone closing or the in-situ retorting of solidifying state fossil fuel oil shale, coal, viscous crude etc..In formation breakdown
In the case of, production zone is linked up by fracturing fracture and stratum primary fracture, and production zone has water inlet and pollutant is outside
The possibility of diffusion, under conditions of production zone seepage characteristic is not influenceed, the orientation of being closed in-situ retorting region using slurries
Leakage stopping technology.
Background technology
The today's society still conventional fuel that increases continuous to energy demand is but increasingly in short supply due to consuming, and has huge reserves
Oil shale can turn into conventional gas and oil substitutable resources.Oil shale need not be excavated and arrive earth's surface by oil shale in-situ exploitation, be opened
Efficiency high is adopted, environmental pollution is small, and buries deeper oil shale layer available for exploitation, the master that will be utilized as oil shale recovery
Want mode.
Oil shale in-situ exploitation needs to heat oil shale layer in underground, kerogen cracking is gone out oil gas, to avoid
The loss of heat during heating, it is impossible to the water allowed in stratum enters in-situ retorting region, while to prevent the oil gas cracked out from entering
Stratum, pollutes environment, must close production zone during exploitation." a kind of oil shale in-situ is local for the patent of Jilin University's application
The method of chemical reaction flows shale oil gas " (patent No. CN103710563A) and " hydro carbons in a kind of ground in-situ extraction oil shale
The near critical water law proposed in the method for compound " (patent No. CN101871339A) is required for sternly in specific implementation process
The region closing of lattice.
Mainly pre-configured slurries are transported to specifically by Grouting Pipe using the leakage stopping technology of cement grout
At the crack of stratum, slurry infiltration can close crack after solidification into crack.Make production zone in oil shale in-situ exploitation
The orientation leakage stopping technology of closing is particularly important.
The ground in-situ production practice (ICP) of Shell Co. Ltd proposes a kind of underground freezing wall technology, with heated well and
Producing well periphery certain distance bores more mouthfuls of spacing necessarily and is interconnected to form the freezing well of closed system, then by into well
Freezing liquid is injected, freezing liquid circulates in system, so as to form the effect of closing.The method long construction period, power consumption is high, and
Need, apart from the peripheral segment distance of group wells, to be not suitable for the small range orientation leak stopping in Specific construction.
The content of the invention
What the purpose of the present invention was closed in being exploited aiming at above-mentioned the deficiencies in the prior art and oil shale in-situ to region
Urgency proposes a kind of orientation blocking method for the closing of oil shale underground in situ production zone.
The purpose of the present invention is achieved through the following technical solutions：
A kind of orientation blocking method for the closing of oil shale underground in situ production zone, it is applicable to the oil of different buried depth
The in-situ retorting of shale, in the oil shale in-situ productive formation of pressure break, orient slip casting using existing well and areal pressure is protected
Maintaining method, production zone fisstured flow characteristic is not influenceed, form the in-situ retorting target area of closing.Underground water is avoided to enter
Entering production zone influences pyrolytic process, and has just exempted from water environment and geology outside oil gas product and the outside diffusion pollution region of pollutant
Environment.
Existing well is process well necessary to oil shale in-situ exploitation, and in post-fracturing oil shale layer, existing well passes through
The crack of pressure break connects with the water system outside region.Certain pressure is kept in other existing wells in addition to slip casting well, pressure includes
The gas pressure for filling the hydrostatic pressure of water in other existing wells of non-slip casting well and being provided in well head by air compressor machine, pressure must
Be able to must accurately it control.By grouting pressure and locality protection pressure collective effect, the slurries for making to inject by slip casting well only pass through
Fracturing fracture, the rock fracture into outside in-situ retorting region, without entering oil shale in-situ exploitation target area, reach fixed
To the purpose of leak stopping.
The slurries of injection are to have the characteristics that quick-drying, fast hard and waterproof.The material is：With Portland cement or resistance to height
Warm aluminate cement is base-material, the auxiliary material such as admixture macromolecular fibre, active slag, early strength agent.
Brief description of the drawings
Fig. 1 is the schematic diagram of oil shale in-situ exploitation.
Fig. 2 is the flow graph of slurries when slip casting is closed.
In figure：The wells of 1- first；The wells of 2- second；The wells of 3- the 3rd；4- water；5- cracks；6- cement mortars；7- misses crack；8- is noted
Stock pump；10- first pressure tables；12- second pressure gauges；The pressure gauges of 16- the 3rd；The valves of 9- first；The valves of 13- second, 14- the 3rd
Valve；11- water pumps；15- air compressor machines.
Embodiment
As depicted in figs. 1 and 2, the first well 1 is heat injection well, and the second well 2 and the 3rd well 3 are recovery well, the left side of the first well 1
Crack 5 will be closed.But the position in the crack 5 to be closed is not limited to this, the position in crack 5 can be in the first well 2 or the
The periphery of two wells 3.
A kind of orientation blocking method for the closing of oil shale underground in situ production zone, this method comprise the following steps.
1. landscape apparatus is installed, it is ensured that valve pipeline normal work.
2. existing first well the 1, the 2nd 2 and the 3rd well 3 are filled into water 4, the tripping in oil pipe into the first well 1, nozzle position connects
Adjacent pores bottom, close the well head of 3 existing wells.
3. being pressurizeed using air compressor machine 15 into the second well 2 and the 3rd well 3, setting pressure P is pressurized to, is seen by pressure gauge 16
Examining pressure ensures pressure stability.
4. start grouting pump 8, open the first valve 9, using grouting pump into the first well 1 cement injection.Treat grouting pressure
Suddenly during increase, the first valve 9 is closed, stops slip casting.
5. Hou Ning 2h.
6. anti-liquid well-flushing, clean the first well 1 and oil pipe.The second well 2 and the pressure of the 3rd well 3 are vented, opens the second valve 13
With the 3rd valve 14, the current cleaning tubing and the first well 1 of high pressure are inputted into the first well 1 by water pump 11, current pass through
Three valves 14 are discharged.
7. the slurries remained in production zone are washed out to the fill cycle of the first well 1 by the second well 2 and the 3rd well 3.
Example：
Somewhere, oil shale layer buried depth are 442~553 meters, and oil shale recovery region is 40m × 40m square areas,
There are 4 mouthfuls of wells job site, a diameter of 346mm of well, is distributed in square, and the first well 1 is fractured well, the second well 2, the 3rd well 3
Go out liquid with the 4th well, found by water pumping experiment, the underground water outside in-situ retorting region enters production zone, flow 2m3/
h.It was found that there are a large amount of cracks in the left side oil shale layer of the first well 1, to ensure that engineering is smoothly implemented, it is necessary to which crack is blocked.
Water 4 will be filled in first well 1, the second well 2, the 3rd well 3 and the 4th well, the tripping in Grouting Pipe into the first well 1, the mouth of pipe
Bottom hole is closely located to, closes the well head of 4 mouthfuls of wells.Pressurizeed using air compressor machine 15 into the second well 2, the 3rd well 3 and the 4th well, pressure
For 2.5MPa.Start grouting pump, the cement injection into the first well 1.Grouting pressure is 1MPa.Slip casting terminates rear Hou Ning 3h.Anti- liquid
Well-flushing, the slurries that Grouting Pipe and production zone remain are washed out.The orientation leak stopping work of oil shale underground in situ production zone closing
After the completion of journey construction, water yield is from 48m in production zone3/ d drops to 1m3Within/d, the later stage, from recovery well successful collection to oil
The oil gas that shale cracks out, it was demonstrated that this method is a kind of orientation leak stopping that closed area can be provided for oil shale underground in situ exploitation
Method, avoid the water inlet in in-situ retorting region and the oil gas of output, pollutant to external diffusion.
Claims (6)
- A kind of 1. orientation blocking method for the closing of oil shale underground in situ production zone, it is characterised in that：This method be In the oil shale in-situ productive formation of pressure break, slip casting and areal pressure guard method are oriented using existing well, does not influence to exploit Area fractures seepage characteristic, form the in-situ retorting target area of closing.
- 2. a kind of orientation blocking method for the closing of oil shale underground in situ production zone according to claim 1, its It is characterised by：Existing well is process well necessary to oil shale in-situ exploitation, outside the crack and region that existing well passes through pressure break Water system connects, and injects slurries in existing well, by fracturing fracture, into rock fracture, reaches the purpose for orienting leak stopping.
- 3. a kind of orientation blocking method for the closing of oil shale underground in situ production zone according to claim 1, its It is characterised by：Certain pressure is kept in other existing wells in addition to slip casting well, is total to by grouting pressure and locality protection pressure Same-action, slurries orientation is injected into crack, prevent slurries from entering oil shale in-situ exploitation target area.
- 4. a kind of orientation blocking method for the closing of oil shale underground in situ production zone according to claim 1 and 2, It is characterized in that：The slurries of injection are to have the characteristics that quick-drying, fast hard and waterproof.The material is：With Portland cement or High temperature resistant aluminate cement is base-material, the auxiliary material such as admixture macromolecular fibre, active slag, early strength agent.
- 5. a kind of orientation blocking method for the closing of oil shale underground in situ production zone according to claim 1 and 3, It is characterized in that：Water is filled in other existing wells of non-slip casting well, and certain pressure is kept in well head, keeps pressure energy essence Really control.
- 6. a kind of orientation blocking method for the closing of oil shale underground in situ production zone according to claim 1, its It is characterised by：This method includes step in detail below：1) installs landscape apparatus, it is ensured that valve pipeline normal work；2) well (3) of existing first well (1), the 2nd 2 and the 3rd is filled water (4) by, the tripping in oil pipe into the first well (1), mouth of pipe position Access hole bottom is put, closes the well head of 3 existing wells；3) is pressurizeed using air compressor machine (15) into the second well (2) and the 3rd well (3), is pressurized to setting pressure P, is passed through pressure gauge (16) observation pressure ensures pressure stability；4) start grouting pump (8), open the first valve (9), using grouting pump into the first well (1) cement injection.Treat slip casting pressure When power increases suddenly, the first valve (9) is closed, stops slip casting；5) Hou Ning 2h；6) the anti-liquid well-flushings of, the first well of cleaning (1) and oil pipe.The second well (2) and the 3rd well (3) pressure are vented, opens the second valve (13) the current cleaning tubing and the first well of water pump (11) input high pressure into the first well (1) and the 3rd valve (14), are passed through (1), current are discharged by the 3rd valve (14)；7) washes the slurries remained in production zone by the second well (2) and the 3rd well (3) to the first well (1) fill cycle Go out.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109358176A (en) * | 2018-10-26 | 2019-02-19 | 吉林大学 | A kind of exploitation of oil shale in-situ influences laboratory analog system to groundwater environment |
| CN112177564A (en) * | 2020-09-17 | 2021-01-05 | 三峡大学 | High-pressure jet grouting system for building underground concealed reservoir and building method |
| CN115306367A (en) * | 2022-08-19 | 2022-11-08 | 陕西省煤田地质集团有限公司 | Method for underground in-situ conversion and economic evaluation of oil-rich coal |
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| CN101163851A (en) * | 2005-04-22 | 2008-04-16 | 国际壳牌研究有限公司 | Double barrier system for an in situ conversion process |
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| CN104364350A (en) * | 2012-06-13 | 2015-02-18 | 红叶资源公司 | Access system for a pressure controlled environment |
| CN106703752A (en) * | 2016-12-03 | 2017-05-24 | 吉林大学 | System closing method used for oil shale underground in-situ exploitation |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5507149A (en) * | 1994-12-15 | 1996-04-16 | Dash; J. Gregory | Nonporous liquid impermeable cryogenic barrier |
| CN1575376A (en) * | 2001-10-24 | 2005-02-02 | 国际壳牌研究有限公司 | In situ recovery from a hydrocarbon containing formation using barriers |
| CN101163851A (en) * | 2005-04-22 | 2008-04-16 | 国际壳牌研究有限公司 | Double barrier system for an in situ conversion process |
| CN102428252A (en) * | 2009-05-15 | 2012-04-25 | 美国页岩油有限责任公司 | In situ method and system for extraction of oil from shale |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109358176A (en) * | 2018-10-26 | 2019-02-19 | 吉林大学 | A kind of exploitation of oil shale in-situ influences laboratory analog system to groundwater environment |
| CN112177564A (en) * | 2020-09-17 | 2021-01-05 | 三峡大学 | High-pressure jet grouting system for building underground concealed reservoir and building method |
| CN115306367A (en) * | 2022-08-19 | 2022-11-08 | 陕西省煤田地质集团有限公司 | Method for underground in-situ conversion and economic evaluation of oil-rich coal |
| CN115306367B (en) * | 2022-08-19 | 2023-11-21 | 陕西省煤田地质集团有限公司 | Underground in-situ conversion and economical evaluation method for oil-rich coal |
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Application publication date: 20180109 |
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