CN103122759B - A kind of coal bed gas well multielement hot fluid enhanced recovery method - Google Patents
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- 238000011084 recovery Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000007789 gas Substances 0.000 claims abstract description 102
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 40
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000002347 injection Methods 0.000 claims abstract description 26
- 239000007924 injection Substances 0.000 claims abstract description 26
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 20
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000000605 extraction Methods 0.000 claims abstract description 18
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- 125000005011 alkyl ether group Chemical group 0.000 claims 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims 1
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- XQCFHQBGMWUEMY-ZPUQHVIOSA-N Nitrovin Chemical compound C=1C=C([N+]([O-])=O)OC=1\C=C\C(=NNC(=N)N)\C=C\C1=CC=C([N+]([O-])=O)O1 XQCFHQBGMWUEMY-ZPUQHVIOSA-N 0.000 description 1
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Abstract
The invention discloses a kind of coal bed gas well multielement hot fluid enhanced recovery method, be using the compression of the coal bed gas of other gas well extraction as fuel with pressurize after air mix and inject multielement hot fluid generating means and burn and produce the high temperature such as carbon dioxide and nitrogen high pressure mixed gas, extraction underground water vaporization after the process relying on the high temperature and high pressure gas produced mixing to be mixed, produce with high-temperature high-pressure steam and carbon dioxide, nitrogen mixed gas is main multielement hot fluid, the multielement hot fluid produced is injected subterranean coal via well head along oil pipe, closing well boils in a covered pot over a slow fire well, it is opening well and making production after casing pressure tends towards stability.The invention solves the problem that carbon dioxide air source is difficult to obtain, there is the effect of gaseous mixture displacement exploiting coal bed methane, the multielement hot fluid injected brings amount of heat into coal seam reservoirs, thus heating coal seam, the effect of heat injection and note mist is worked in coordination with, can significantly improve coal bed gas well gas production and coal bed gas recovery ratio, the enforcement that can be coal-bed-gas production-increase measure provides guidance.
Description
Technical field:
The present invention relates to a kind of coal bed gas well enhanced recovery method, espespecially by injecting the method that multielement hot fluid carries out handling up to improve coal bed gas well recovery ratio to coal bed gas well.
Background technology:
China's coal bed gas resource enriches, but the hypotonic characteristic of China's coal seam reservoirs and characterization of adsorption are the bottlenecks of cbm development, therefore how to improve coal seam permeability and desorption rate, and then raising methane output is that China's coal bed gas develops one of faced main difficulty at present.In order to improve coal seam permeability, improve coal bed gas recovery ratio and extraction speed, the raising coal bed gas recovery efficiency technique generally taked at present mainly contains following three kinds: fracturing renovation technique, directed pinniform horizontal drilling technology, Enhanced Coalbed Methane Recovery by Injecting Gas technology.Fracturing renovation technique is the crack being formed some by fracturing in coal seam, promotes the propagation of Pressure Drop, and forms good migration pathway, thus impels coal bed gas can with industrial gas output.But coal seam reservoirs is subject to hydraulic pressure through the crack that fracturing is formed and forms densification district, simultaneously because coal seam is softer, proppant cannot play supporting role, therefore cause closing up of cracks, and the water base sand fracturing technology of taking adopted at present can cause damage to coal seam reservoirs, though so fracturing renovation technique is through the test in more than ten years, most effect is all undesirable.Directed pinniform horizontal drilling technology is the patented technology of CDX company of the U.S., be applicable to anisotropy obviously, comparatively large and relatively stable, the high-rank coals of distributing of thickness, hyposmosis, high strength and high air content coal seam, this technological break-through point range of straight well and horizontal well or limitation of line scope drainage and step-down in the past, cracks in coal seam system can be linked up to greatest extent, expand step-down scope and disappointing area, reduce the flow resistance of Gas-water phases stream in crack, thus increase substantially well yield.But multi-lateral directional horizontal drilling technology drilling technology cost is higher, be only applicable to that thickness is comparatively large and distribution is stable, the coal seam of structural integrity, and need the geological conditions that coal rank are higher, ature of coal is harder, because coal bed gas Pinnate horizontal drilling developing history is shorter, so many key technologies also need further research.Enhanced Coalbed Methane Recovery by Injecting Gas technique functions comes from carbon dioxide coal seam Plugging Technology Applied, refers to that carbon dioxide, nitrogen or the mist of the two are injected deep unminable coal seams to be sealed up, and to reduce greenhouse gas emission, cements out coal bed gas simultaneously.On the one hand after injecting gas, maintain the barometric gradient higher than simple mining, drive coal bed gas to flow to producing well; On the other hand, the carbon dioxide of injection and methane competitive Adsorption, methane is replaced, and the injection of multicomponent gas also reduces the dividing potential drop of coal bed methane, promotes methane desorb further, improves the recovery ratio of coal bed gas.Gas injection displacement technology in coal seam not only can reduce carbon dioxide isothermal chamber gas purging, and can increase production coal bed gas, at present, Enhanced Coalbed Methane Recovery by Injecting Gas is considered to a kind of New Measure with development prospect, is subject to the extensive concern of each side in this way simultaneously.But the key of development gas injection yield-increasing technology is source of the gas, and namely will find Natural carbon dioxide gas source, so this technical costs is higher, its economic serviceability is still under suspicion.
Summary of the invention:
Main purpose of the present invention is to provide a kind of coal bed gas well multielement hot fluid enhanced recovery method, being undertaken handling up to improve Production of Coal-bed Gas Wells and coal bed gas recovery ratio by injecting multielement hot fluid in coal seam, the effect of Enhanced Coalbed Methane Recovery by Injecting Gas technology can be obtained.
Object of the present invention realizes as follows: using the compression of the coal bed gas of other gas well extraction as fuel with pressurize after air mix and inject multielement hot fluid generating means and burn and produce the high temperature such as carbon dioxide and nitrogen high pressure mixed gas, extraction underground water vaporization after the process relying on the high temperature and high pressure gas produced mixing to be mixed, produce with high-temperature high-pressure steam and carbon dioxide, nitrogen mixed gas is main multielement hot fluid, the multielement hot fluid produced is injected subterranean coal via well head along oil pipe, closing well boils in a covered pot over a slow fire well, observe casing pressure change and detailed record, it is opening well and making production after casing pressure tends towards stability, concrete enforcement comprises the following steps:
(1) service shaft is chosen: according to block coal geology data and the analysis of coal bed gas well mining, and preferably bore chance single coal seam average effective caliper and be greater than 4m, average aquifer yield is lower than 5m at present
3/ d, early stage, peak value gas production was higher than 1500m
3/ d, demonstrates the vertical of good production potential or directional type or horizontal and produces gas well as service shaft.
(2) parameter designing: according to the recovery history data of concrete bed gas reservoir geological conditions and selected service shaft, carry out the reasonable injection parameter designing that coal bed gas well multielement hot fluid is handled up, comprising multielement hot fluid implantation temperature is 150 DEG C-350 DEG C, injection pressure is 3-15MPa, and injection rate is 5000-20000Nm
3/ d; Injection length is 30-40d, and concrete implantation temperature and pressure requirements can be determined according to actual coal seam buried depth and coal seam fracture pressure.
(3) inject: inject multielement hot fluid generating means by mixing with the air after compression after the coal bed gas come from other gas well extraction pressurization, ignition in the combustion chamber of described generating means, produce HTHP mist, require the extraction underground water after mixing process according to design temperature simultaneously, the amount of heat relying on burning to produce is vaporized, such generation is with water vapour and carbon dioxide, nitrogen mixed gas is main multielement hot fluid, preferably assistant chemical agent can be added as required in multielement hot fluid, the alkylether sulfonate frother of such as preferred high temperature resistance or corrosion inhibiter etc., then described multielement hot fluid is injected subterranean coal via well head by plain tubing or insulated tubing, being filled with nitrogen mode by annular space nitrogen injection or annular space carries out heat insulation.
(4) closing well drives a well: after completing multielement hot fluid design injection rate, closedown multielement hot fluid generating means, stopping water filling, and closing well boils in a covered pot over a slow fire well 3-15d, observes casing pressure change and detailed record, is opening well and making production after casing pressure tends towards stability.When the daily output tolerance of coal bed gas well is decremented to economic daily output tolerance again, restart the cyclic process of above-mentioned injection, closing well and the gas production that drives a well.A bite coal bed gas well can according to actual conditions circulate injecting multielement hot fluid handle up exploitation multiple cycle.
The present invention's beneficial effect is compared with prior art, by injecting the ignition of multielement hot fluid generating means by mixing with the air after compression after the coal bed gas come from other gas well extraction pressurization, produce HTHP mist, thus solve carbon dioxide air source be difficult to obtain problem, there is the effect of gaseous mixture displacement exploiting coal bed methane, the water vapour injected, nitrogen, carbon dioxide can bring amount of heat into coal seam reservoirs, thus heating coal seam, after coal seam temperature raises, after the coal seam gas molecule absorption heat adsorbed in coal seam, kinetic energy increases, molecular thermalmotion is violent, desorption ability strengthens, desorption rate improves, and after temperature increase, coal reservoir fracture system can be improved to a certain extent.In addition, when coal bed gas well gas production drops to a certain degree, due to the impact of drainage and step-down in early stage, coal seam reservoirs pressure is lower, and the producing pressure differential of methane is also less, therefore the speed of response is lower, carry out multielement hot fluid to handle up enhanced recovery coal bed gas in good time, can supplement in time and keep coal seam energy, improving the producing pressure differential of methane, order about methane and flow to producing well.Therefore, theoretically, heat injection and note mist can promote coal bed gas desorb by coal bed gas well multielement hot fluid enhanced recovery method, improve the infiltrative effect of coal seam reservoirs works in coordination with, thus increase substantially coal bed gas recovery ratio, therefore its effect is better than Enhanced Coalbed Methane Recovery by Injecting Gas technology, it is the theoretical completely newly exploration with improving recovery efficiency technique of coal-bed-gas production-increase.
Accompanying drawing illustrates:
Fig. 1 is the multielement hot fluid generation of one embodiment of the invention and the schematic diagram of injected system.
Wherein: the compression of 1-extraction coal bed gas and pressurization system; 2-extraction groundwater treatment system; 3-air compressing and pressurization system; 4-water injecting pump; 5-injection control system; 6-multielement hot fluid generating means; 7-well head; 8-plain tubing or insulated tubing; 9-sleeve pipe.
Detailed description of the invention:
Below in conjunction with accompanying drawing, the invention will be further described, but do not limit practical range of the present invention.
Detailed process of the present invention and operating principle is explained below for Eastern Margin of Ordos Basin coal bed gas well.
This coal bed gas well is directional well, bores and meets vertical depth 480m in the middle part of coal seam thickness 8.87m(coal seam), coal seam pressure 3.60MPa, coal seam critical desorption pressures about 2.50MPa.
See Fig. 1, in multielement hot fluid generating means 6, the coal bed gas of pressurization is carried by the compression of extraction coal bed gas and pressurization system 1, in multielement hot fluid generating means 6, the air of pressurization is carried again by air compressing and pressurization system 3, after the igniter fire in multielement hot fluid generating means 6, mist burns, and releases amount of heat and produces HTHP mist.In multielement hot fluid generating means 6, carry the water after processing via extraction groundwater treatment system 2 by water injecting pump 4 simultaneously, rely on the amount of heat vaporization that mist burning is released, thus produce based on the multielement hot fluid of high-temperature high-pressure steam, carbon dioxide and nitrogen mixed gas, wherein by injection rate and the pressure of the extraction underground water after the compression coal bed gas of injection control system 5 monitor and forecast multielement hot fluid generating means 6 arrival end, air and process and port of export multielement hot fluid; Be 210 DEG C by the temperature of generation, pressure is that the multielement hot fluid of 4.0-6.0MPa is delivered to after well head 7 through surface line and is delivered to shaft bottom by plain tubing or insulated tubing 8, thus enters subterranean coal, injection rate is 15000Nm
3/ d; Injection length is 30d, according to specific needs can simultaneously to by plain tubing or the annular space nitrogen injection formed between insulated tubing 8 and sleeve pipe 9 or be filled with nitrogen and carry out heat insulation.After multielement hot fluid has injected, close multielement hot fluid generating means, stop water filling, closing well boils in a covered pot over a slow fire well, and observe casing pressure and change also record in detail, namely drive a well gas production after casing pressure tends towards stability.
In sum; these are only preferred embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or conversion, all should be encompassed within protection scope of the present invention.Therefore, the protection domain that protection scope of the present invention should define with claim is as the criterion.Beneficial effect of the present invention is not only can to play carbon dioxide and the gas displacing coal-bed effect of nitrogen mixed gas, and the water vapour injected, nitrogen, carbon dioxide can bring amount of heat into coal seam reservoirs, the coal bed gas desorb being in adsorbed state can be promoted further, improve coal reservoir fracture system to a certain extent.
The present invention has the following advantages: the coal bed gas that the fuel of the multielement hot fluid generating means described in (1) directly utilizes other gas well to exploit out, inject water then directly adopt process after extraction underground water, can effectively reduce costs.(2) compared with Enhanced Coalbed Methane Recovery by Injecting Gas technology, the present invention directly obtains the carbon dioxide for replacing coal bed gas from compression coal bed gas and compressed-air actuated combustion product, solves the problem that carbon dioxide air source is difficult to obtain.(3) multielement hot fluid of the present invention injects subterranean coal, can play anatonosis effect to hyposmosis coal seam reservoirs.(4) thermal efficiency of the present invention is high, and the gas that burning produces all injects underground, can effectively GHG emissions mitigation, and environmental protection effect is good.(5) the present invention can dredge blocked venturi and preforation tunnel, impels payzone to circulate, has plugging removal effect.(6), after multielement hot fluid of the present invention adds blowing agent, there is the good ability of carrying solid particle, greatly can improve the effect of wellbore clearance.(7) multielement hot fluid of the present invention injects subterranean coal, effectively can supplement and improve coal seam reservoirs pressure, improves the driving pressure reduction of coal bed gas product, orders about coal bed gas to production Wellbore Flow.Therefore, the present invention has the features such as fuel easily obtains, clear principle understands, enforcement is convenient, and can significantly improve coal bed gas well gas production and coal bed gas recovery ratio, the enforcement that can be coal-bed-gas production-increase measure provides guidance.
Claims (2)
1. a coal bed gas well multielement hot fluid enhanced recovery method, it is characterized in that, using the compression of the coal bed gas of other gas well extraction as fuel with pressurize after air mix and inject multielement hot fluid generating means and burn and produce HTHP mist, the high temperature and high pressure gas produced is relied on to mix the extraction underground water vaporization of mixing, produce high-temperature high-pressure steam and carbon dioxide, the multielement hot fluid of nitrogen mixing, the multielement hot fluid produced is injected subterranean coal via well head along oil pipe, closing well boils in a covered pot over a slow fire well, it is opening well and making production after casing pressure tends towards stability, specifically comprise the following steps:
Step (1), service shaft are chosen: according to block coal geology data and the analysis of coal bed gas well mining, and choose brill chance single coal seam average effective caliper and be greater than 4m, average aquifer yield is lower than 5m at present
3/ d, early stage, peak value gas production was higher than 1500m
3/ d, demonstrates the gas well of good production potential as service shaft;
Step (2), parameter designing: according to the recovery history data of bed gas reservoir geological conditions and selected service shaft, carry out the injection parameter design that coal bed gas well multielement hot fluid is handled up, comprising multielement hot fluid implantation temperature is 150-350 DEG C, injection pressure is 3-15MPa, and injection rate is 5000-20000Nm
3/ d; Injection length is 20-40d;
Step (3), multielement hot fluid injects: controlled by the injection parameter of injection control system according to design, multielement hot fluid generating means is injected by mixing with the air after compression after the pressurization of the coal bed gas of other gas well extraction, ignition in the combustion chamber of described generating means, produce HTHP mist, the extraction underground water after process is mixed in mixing simultaneously, the heat relying on burning to produce is vaporized, produce with water vapour and carbon dioxide, the multielement hot fluid of nitrogen mixing, assistant chemical agent is added in multielement hot fluid, then described multielement hot fluid is injected subterranean coal via well head by plain tubing or insulated tubing, and in annular space, be filled with nitrogen carry out heat insulation,
Step (4), closing well drive a well: after completing multielement hot fluid design injection rate, closedown multielement hot fluid generating means, stopping water filling, and closing well boils in a covered pot over a slow fire well, observe casing pressure change and detailed record, are opening well and making production after casing pressure tends towards stability;
Step (5), when the daily output tolerance of coal bed gas well is decremented to economic daily output tolerance again, restart the cyclic process of above-mentioned steps (1)-step (4);
Described assistant chemical agent is alkylether sulfonate frother or corrosion inhibiter.
2. coal bed gas well multielement hot fluid enhanced recovery method as claimed in claim 1, it is characterized in that, described coal bed gas well is vertical or directional type producing well.
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| CN105138029B (en) * | 2015-08-03 | 2016-06-29 | 陈信平 | The compress control method of note nitrogen volume increase coal bed gas |
| CN105735956A (en) * | 2016-02-19 | 2016-07-06 | 中国海洋石油总公司 | Hot fluid injection blockage relieving and production increasing process for immovable string |
| CN106640007A (en) * | 2016-12-30 | 2017-05-10 | 中国海洋石油总公司 | Multisource and multielement thermal fluid generating and method |
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| CN108843278B (en) * | 2018-07-25 | 2020-05-19 | 辽宁工程技术大学 | Device and method for exploiting low-permeability reservoir coal bed gas through solar hot air heating |
| CN110778301B (en) * | 2019-10-22 | 2020-07-14 | 中国矿业大学 | High-temperature high-pressure steam secondary fracturing device and method for coal seam drilling |
| CN112360408A (en) * | 2020-12-03 | 2021-02-12 | 西南石油大学 | Novel method for improving recovery ratio of thickened oil by injecting carbon dioxide hot fluid |
| CN114921518A (en) * | 2022-05-23 | 2022-08-19 | 成都能生材科技开发有限责任公司 | Nano-microorganism co-production technology for coal bed adsorbed gas, coal-to-hydrogen gas and coal-to-methane |
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