CN107387041A - One kind note critical medium oil shale single well stimulation conversion process - Google Patents

One kind note critical medium oil shale single well stimulation conversion process Download PDF

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Publication number
CN107387041A
CN107387041A CN201710822239.0A CN201710822239A CN107387041A CN 107387041 A CN107387041 A CN 107387041A CN 201710822239 A CN201710822239 A CN 201710822239A CN 107387041 A CN107387041 A CN 107387041A
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Prior art keywords
oil
oil shale
shale
well
critical
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CN201710822239.0A
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李强
韩婧
孙友宏
赵帅
刘召
王振东
陈强
康世杰
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Jilin University
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Jilin University
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/166Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/34Arrangements for separating materials produced by 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)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)

Abstract

One kind note critical medium oil shale single well stimulation conversion process, it is that individual well pattern is formed by subdrilling a bite active well, perforation is carried out in shaft bottom oil shale layer position, improve the porosity and permeability of oil shale, and water and gas are injected into active well and heating makes shaft bottom reach predetermined critical environment, the cracking to organic matter in oil shale is completed by the extraction and catalytic action of critical medium, as critical medium is gradually penetrated into inside oil shale, finally realize the progressively extraction to oil shale from inside to outside, the oil water mixture of acquisition is drawn into after earth's surface and carries out water-oil separating acquisition shale oil and shale gas.After the completion of reaction, the critical medium isolated is circulated into secondary use of the injection realization to waste heat.Present invention reduces cost of winning, improves production efficiency.

Description

One kind note critical medium oil shale single well stimulation conversion process
Technical field
The present invention relates to a kind of oil shale recovery technique, more particularly to a kind of note critical medium oil shale single well stimulation conversion Technique, by the way that critical medium will be injected in individual well, oil shale organic matter is cracked into the organic compound of different chain length, so as to obtain Shale oil and shale gas are obtained, realizes the converted in-situ to oil shale.It is a kind of method for improving oil shale oil productivity.This skill Art method can be widely used in the in-situ retorting of solid or solidifying state fossil fuel (oil shale, coal, viscous crude).
Background technology
International community's expanding economy make a general survey of over it can be found that oil shows ten in politics, military, diplomacy etc. Divide important role, the competition of oil field.China from the net importer for having begun to change into oil in 1993, and The interdependency of imported crude oil is gradually increased, the apparent consumption of Crude Oil in China in 2016 is 5.778 hundred million tons, and external dependence degree is high Up to 65.4%, 4.6 percentage points, therefore the insufficient or price ripple that international petroleum market is temporary transient were improved relative to 2015 The dynamic development that can all influence China's economic, threatens Chinese energy safety.Oil shale, the unconventional energy huge as a kind of reserves Source, turn into the important research direction of countries in the world with its abundant stock number and mining feasibility.
Oil shale is a kind of sedimentary rock for containing flammable organic matter with high-ash inside, when temperature reaches certain requirement When, cracking reaction occurs for internal organic matter, and generates shale oil and organic gas.How more efficient extraction shale oil, improve The yield of shale oil gas turns into the key of oil shale in-situ cracking oil shale.
At present, the production technique of oil shale is broadly divided into earth's surface retorting technique and in-situ retorting technology.Earth's surface retorting technique Although technology relative maturity, is widely used, tool has disadvantages that:Produce the waste gas and sewage of high pollution, substantial amounts of waste residue Accumulation, a large amount of areas are taken, pollute environment;Exploitation to subterranean oil shale easily causes goaf, causes surface collapse.Oily page Rock in-situ retorting technology can not only solve many problems of ground destructive distillation, can also apply the low-quality oil shale to deep layer Cracking, be a kind of very wide method of development prospect.At present, world many countries are proposed oil shale in-situ cracking side Method.Xue Fulong and the Los Alamos in the U.S. (Los Alamos) National Laboratory's cooperative research and development CRUSH technologies, the patent No. It is CN101421488A, its operation principle is by the CO of high temperature2It is passed into the oil shale formation of pressure break, oil shale layer is produced Pressure break acts on, and by heat convection heating oil shale layer, caused hydrocarbon gas produces from recovery well with fluid.IEP companies GFC technologies are have developed, this technology is to carry out In Situ Heating to oil shale using the reaction heat of high-temperature fuel cell stack, available The hydrocarbon gas caused by heating is passed through battery pile as fuel, but needs to be passed through natural gas as starting fluid in starter.EGL Company proposes convection current add-back stream heat transfer theory, carries out In Situ Heating to oil shale by this method, and this key problem in technology is There is provided horizontal well heat-exchange system, the loop of closure is formd, energy loss is smaller in heating process, and capacity usage ratio is high.It is lucky A kind of method for underground in-situ extraction of hydrocarbon compound in oil shale that woods university proposes, by using the mode of more wells, utilize Electromagnetic Heating or supercritical steam generator realize near critical environment, so as to realize the extraction to hydrocarbon compound.Taiyuan science and engineering University research group wells pressure break formula convective heating methods carry out In Situ Heating to oil shale, and group wells pressure break can make crack between group wells Connection, is passed through high-temperature gas and is cracked, while heated well and producing well also are carried out into interval rotation, improves the heated of oil shale The uniformity, oil productivity accordingly improve.Israel scientist and Jilin University have developed topochemical reaction method jointly (Topochemical in-situ method), abbreviation TS methods, TS methods are to be passed through air and hydrocarbon to underground by way of convection current Class gas, burning produce heat oil shale, and control is passed through air content to reach optimal heating effect, completes original position and splits Solution.
The content of the invention
It is an object of the invention to provide one kind to note critical medium oil shale single well stimulation conversion process, and the present invention will be by that will face Boundary's medium is injected into the extraction realized in oil shale layer to shale oil, can be effectively reduced engineering time and operating expenses. In whole process, by controlling the temperature and pressure of injected media to form critical environment, final realize turns to oil shale in situ Change.
The present invention is to form individual well pattern by subdrilling a bite active well, carries out perforation in shaft bottom oil shale layer position, carries The porosity and permeability of high oil shale, and inject water and gas into active well and heating makes shaft bottom reach predetermined critical ring Border, the cracking to organic matter in oil shale is completed by the extraction and catalytic action of critical medium, oil is carried out after being drawn into earth's surface Water separation obtains shale oil and shale gas.After the completion of reaction, the critical medium isolated will be injected in active well, realized to remaining The secondary use of heat.
The present invention's comprises the concrete steps that:
(1) according to the distribution characteristics of oil shale layer, bung down to targeted oil shale layer and carry out completion construction;
(2) two pipelines of tripping in well, as gas injection and filling pipe and oil production tube, wherein gas injection and water filling public one Individual pipeline, form gas injection and oil-producing passage;
(3) critical medium heater is put into active well with pipeline, closes well head;
(4) inject water into well and inert gas, injection rate determine according to the thickness of oil shale layer;
(5) critical medium heater is opened, it is 300 DEG C -450 DEG C oil shale is internally formed temperature, pressure 9-25MPa Overcritical or near critical environment, keep rock stratum in temperature and pressure keep 48 hours;
(6) in the presence of critical medium, the advantages of using its high diffusivity coefficient, high-dissolvability and low-viscosity, to oily page Asphalitine and kerogen inside rock are extracted, and oil water mixture is formed in active well.
(7) work well pressure is reduced, earth's surface oil water mixture extracting will be arrived caused by extraction by oil-producing passage, use oil Water separation equipment is separated shale oil and water, separation to water be injected into by sofening treatment Posterior circle in active well, For continuing to extract shale oil.
(8) after the completion of the oil shale extraction work in region, the water isolated is injected into active well, the heat recycled Water can be directly injected into new active well, form the recycling of oil shale energy.
The beneficial effects of the invention are as follows:
The invention make use of the extraordinary solubility property of critical medium, act not only as solvent, can also be used as anti- Thing and catalyst are answered, the organic matter come in in-situ extraction oil shale.During critical medium extracts hydrocarbon product, critical medium Transferred heat to first as heat-conduction medium in oil shale layer, accelerate the curing and extraction of oil shale;It is used as and urges simultaneously Agent promotes the rapid extraction of shale oil, and the shale oil extracted finally is carried into earth's surface as solvent.By changing temperature The environment of reaction, the speed of concerted reaction and the selection activity of catalyst can be changed with pressure.Simultaneously water have it is cheap, The nontoxic and segregative feature of lysate, exploit work for ground in-situ and saved cost.Critical medium heater is put into In active well, caused energy is directly passed to water or steam, reduces heat loss, in addition, standing column well technique can be effective The critical condition of underground must be ensured, reduce the risk of pressure leakages, other method for destructive distillation times are short than underground, efficiency high.
Brief description of the drawings
Fig. 1 is principle of the invention figure.
Fig. 2 is closure top view.
In figure:1- oil shale layers;2- active wells;3- critical medium heaters;4- packers;5- packer passages;6- is noted Gas and filling pipe;7- backwater and oil extraction pipeline;8- cables and signal wire;9- heater controllers;10- high-pressure hydraulic pumps;11- increases Depressor;12- vacuum tanks;13- storage tanks;14- oily water separating equipments;15- gas tanks;16- oil tanks;17 closures
Embodiment
Example 1:As shown in figure 1, the present embodiment comprises the following steps that:
Somewhere oil shale buried depth is 410-420m, and destination layer position oil shale thickness is 9m, and oil content 5.73%, ash content contains Measure as 83%, volatile matter content 18.26%, caloric value 3998.31J/g.
(1) it is drilled well:
A, the position of active well is determined according to the trend of oil shale and layer position;
B, a bite active well, a diameter of 346mm, under 0-422m tripping in sleeve pipe 244.5mm, cannula tip are bored on the ground Enter float collar, float shoe, jacket exterior fixes elastic centralizer per 20m;Cement slurry cementing is used between sleeve pipe and the borehole wall;
C, perforation is carried out between 409-422m in hole depth, improves the penetrating power of oil shale around active well;
(2) equipment installation and previous work:
A, earth's surface connection critical medium heater 3 and packer 4, oily water separating equipment 14, heater control are installed on ground The phases such as device 9 processed, high-pressure hydraulic pump 10, booster 11, vacuum tank 12, storage tank 13, oily water separating equipment 14, gas tank 15, oil tank 16 The facility answered;
B, critical medium heater 3 and the connected pipes 7 of packer 4 and cable and signal wire 8 are gradually in lower going-into-well, in well altogether 2 pipelines of tripping in and 4 cables, well head use flange seal, 2 pipelines and wellhead flange welded seal, 4 cables and well head To spread unchecked and use graphite means of press seals, the final position of packer 4 is -395~409m, the position of critical medium heater 3 is 410~ 417m;
C, gas injecting pipe 6 and filling pipe 6 are general in testing, and return out pipeline 7 and are used alone, packer 4 is used in hole Insulate critical medium heating region and other sleeve portions;
D, with the sealing wellhead of closure 17;
E, 0.5m3 water is injected into well, and opens critical medium heater 3, observation pressure of the hole in the bottom, temperature, liquid level change, The timely moisturizing when liquid level declines;Oil shale 1 is set to be internally formed temperature as 300 DEG C -450 DEG C, pressure is the overcritical of 9-25MPa Or near critical environment, continuous work 48 hours;
(3) stage of reaction:
A, in the presence of critical medium, the advantages of using its high diffusivity coefficient, high-dissolvability and low-viscosity, to oil shale Asphalitine and kerogen inside 1 are extracted, and oil water mixture is formed in active well;
B, the pressure and temperature in real-time monitoring work well, it is real when the desired value of temperature or pressure less than setting When heater controller 9, adjustment high-pressure hydraulic pump 10 and booster 11, ensure the higher extraction efficiency of oil shale;
(4) post-processing stages:
A, work well pressure is reduced, oil water mixture caused by extraction is all extracted by oil-producing passage 7 and arrives earth's surface, is made Shale oil and water are separated with oily water separating equipment 14, separation to water work is re-injected into after sofening treatment In well, for continuing to extract shale oil;
B, the temperature and pressure in active well 2 is reset, opens underground critical medium heater 3, was week with 48 hours Phase, persistently tested;
C, after the completion of the oil shale 1 in region extracts work, water and steam are injected into active well 2, the heat recycled Water can be directly injected into new active well, form the recycling of oil shale energy;
D, the shale oil and shale gas obtained through supercooling and water-oil separating is separately stored in oil storage tank 16 and air accumulator 15 It is interior.

Claims (5)

1. one kind note critical medium oil shale single well stimulation conversion process, it is characterised in that:It is by subdrilling a bite active well shape Into individual well pattern, perforation is carried out in shaft bottom oil shale layer position, improves the porosity and permeability of oil shale, and into active well Injection water and gas simultaneously make shaft bottom reach predetermined critical environment using donwhole heater heating medium, pass through the extraction of critical medium Take and cracking of the catalytic action completion to organic matter in oil shale, as critical medium is gradually penetrated into inside oil shale, final reality The now progressively extraction to oil shale from inside to outside, the oil water mixture of acquisition is drawn into after earth's surface and carries out water-oil separating acquisition page Shale oil and shale gas.The secondary use to waste heat is realized in the critical medium circulation injection isolated.
A kind of 2. note critical medium oil shale single well stimulation conversion process according to claim 1, it is characterised in that:It is described Active well be individual well structure.
A kind of 3. note critical medium oil shale single well stimulation conversion process according to claim 1, it is characterised in that:It is described Medium for water, nitrogen or carbon dioxide or cracking after short-chain hydrocarbons gas.
A kind of 4. note critical medium oil shale single well stimulation conversion process according to claim 1, it is characterised in that:It is described Critical medium heater be donwhole heater.
A kind of 5. note critical medium oil shale single well stimulation conversion process according to claim 1, it is characterised in that:Specifically Step is:
(1) according to the distribution characteristics of oil shale layer, bung down to targeted oil shale layer and carry out completion construction;
(2) two pipelines of tripping in well, as gas injection and filling pipe and oil production tube, the wherein public pipe of gas injection and water filling Road, form gas injection and oil-producing passage;
(3) critical medium heater is put into active well with pipeline, closes well head;
(4) inject water into well and inert gas, injection rate determine according to the thickness of oil shale layer;
(5) critical medium heater is opened, oil shale is internally formed temperature as 300 DEG C -450 DEG C, pressure is the super of 9-25MPa Critical or near critical environment, the temperature and pressure in rock stratum is kept to be kept for 48 hours;
(6) in the presence of critical medium, the advantages of using its high diffusivity coefficient, high-dissolvability and low-viscosity, in oil shale The asphalitine and kerogen in portion are extracted, and oil water mixture is formed in active well.
(7) work well pressure is reduced, earth's surface oil water mixture extracting will be arrived caused by extraction by oil-producing passage, use profit point Shale oil and water are separated from equipment, separation to water be injected into by sofening treatment Posterior circle in active well, be used for Continue to extract shale oil.
(8) after the completion of the oil shale extraction work in region, the water isolated is injected into active well, the hot water recycled can It is directly injected into new active well, forms the recycling of oil shale energy.
CN201710822239.0A 2017-09-13 2017-09-13 One kind note critical medium oil shale single well stimulation conversion process Pending CN107387041A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108194065A (en) * 2018-01-19 2018-06-22 中国石油大学(华东) The method for recovery ratio of being handled up using carbon dioxide/cosolvent system raising shale oil
CN108252692A (en) * 2018-04-10 2018-07-06 中国石油大学(北京) A kind of method that shale oil recovery is improved using air oxidation thermal fracture
CN108952653A (en) * 2018-07-19 2018-12-07 新疆博凯通益石油科技有限公司 The thickened oil recovery method of electric heating assisted gravity oil drainage
CN110344797A (en) * 2019-07-10 2019-10-18 西南石油大学 A kind of electric heater unit that underground high temperature is controllable and method
CN112302599A (en) * 2019-07-24 2021-02-02 中国石油化工股份有限公司 Device and method for in-situ extraction of oil shale
CN114412427A (en) * 2020-10-12 2022-04-29 北京星油科技有限公司 Gas lift and production integrated oil and gas exploitation system
CN114810017A (en) * 2022-03-28 2022-07-29 吉林大学 Underground composite heater for underground mineral in-situ development
CN115163013A (en) * 2022-08-09 2022-10-11 中国石油化工股份有限公司 Shale oil vertical well water injection huff-puff yield increase mode

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CN103790563A (en) * 2013-11-09 2014-05-14 吉林大学 Method for extracting shale oil gas by oil shale in-situ topochemical method
CN106640010A (en) * 2017-01-19 2017-05-10 吉林大学 Underground in-situ fluid microwave electric heating method and microwave electric heater

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US4557820A (en) * 1984-05-24 1985-12-10 The Standard Oil Company Conversion of high boiling organic materials to low boiling materials
CN101142372A (en) * 2005-01-19 2008-03-12 Ksn能源有限责任公司 Down hole physical upgrading of heavy crude oils by selective energy absorption
CN101871339A (en) * 2010-06-28 2010-10-27 吉林大学 Method for underground in-situ extraction of hydrocarbon compound in oil shale
CN103790563A (en) * 2013-11-09 2014-05-14 吉林大学 Method for extracting shale oil gas by oil shale in-situ topochemical method
CN106640010A (en) * 2017-01-19 2017-05-10 吉林大学 Underground in-situ fluid microwave electric heating method and microwave electric heater

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108194065A (en) * 2018-01-19 2018-06-22 中国石油大学(华东) The method for recovery ratio of being handled up using carbon dioxide/cosolvent system raising shale oil
CN108252692A (en) * 2018-04-10 2018-07-06 中国石油大学(北京) A kind of method that shale oil recovery is improved using air oxidation thermal fracture
CN108952653A (en) * 2018-07-19 2018-12-07 新疆博凯通益石油科技有限公司 The thickened oil recovery method of electric heating assisted gravity oil drainage
CN110344797A (en) * 2019-07-10 2019-10-18 西南石油大学 A kind of electric heater unit that underground high temperature is controllable and method
CN112302599A (en) * 2019-07-24 2021-02-02 中国石油化工股份有限公司 Device and method for in-situ extraction of oil shale
CN114412427A (en) * 2020-10-12 2022-04-29 北京星油科技有限公司 Gas lift and production integrated oil and gas exploitation system
CN114412427B (en) * 2020-10-12 2023-11-14 北京星油科技有限公司 Gas lift and production integrated oil gas exploitation system
CN114810017A (en) * 2022-03-28 2022-07-29 吉林大学 Underground composite heater for underground mineral in-situ development
CN114810017B (en) * 2022-03-28 2023-10-20 吉林大学 Underground composite heater for in-situ development of underground mineral products
CN115163013A (en) * 2022-08-09 2022-10-11 中国石油化工股份有限公司 Shale oil vertical well water injection huff-puff yield increase mode

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Application publication date: 20171124