CN101624900A - Circulation gas-drilling process system and method thereof - Google Patents
Circulation gas-drilling process system and method thereof Download PDFInfo
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- CN101624900A CN101624900A CN200810116311A CN200810116311A CN101624900A CN 101624900 A CN101624900 A CN 101624900A CN 200810116311 A CN200810116311 A CN 200810116311A CN 200810116311 A CN200810116311 A CN 200810116311A CN 101624900 A CN101624900 A CN 101624900A
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Abstract
The invention discloses a circulation gas-drilling process system and a method thereof. The method comprises the following steps: pressurizing gas in an gas source device, and then injecting the gas into a well; beginning drilling after the gas injection; circularly discharging a gas-liquid-solid mixture in the well, and entering a three-level separation and purification system; and pressurizing clean gas after the separation, and injecting the clean gas again into the well for recycling. The system and the method achieve the aims of reducing gas consumption, reducing gas-drilling cost and lowering environmental pollution through the recycling of the gas.
Description
Technical field
The present invention relates to a kind of oil and gas drilling technology, particularly a kind of circulation gas-drilling process system and method thereof.
Background technology
The gas drilling technology is a new technology of at home and abroad generally being paid attention in recent years with extensive use.It adopts gases such as air, natural gas, nitrogen and tail gas as circulatory mediator, has greatly reduced the pit shaft head of liquid, has realized under balance pressure drilling truly.Thereby have effective protection oil and gas reservoir, in time find oil, increase substantially bit speed, shorten well construction period, reduce drilling cost, improve plurality of advantages such as the rate of oil and gas recovery, difficulty such as easy leakage stratum, multi-thin-layer and poor properties reservoir that now become exploitation low pressure and low permeability reservoir, solution cavity and fracture development are by output and increase substantially bit speed, one of the key technology that increases production and improves productivity.
Current gas drilling technology mode has the following disadvantages:
1, contaminated environment: gas drilling well head effluent contains a large amount of dust, directly is discharged in the atmosphere and can causes air pollution, and directly discharging or burning also all can cause certain pollution and gas that is adopted and down-hole go out natural gas etc.;
2, with high costs: as adopting nitrogen, then jumbo nitrogen-making device cost costliness; As adopt tail gas, then need to consume a large amount of diesel oil to produce tail gas; As adopt natural gas, and then need the sufficiently high source of the gas well of close together and pressure, whenever bung down and consume tens side's natural gases at least.
In view of current gas drilling operation ubiquity pollutes big, defect of high cost, needing badly provides a kind of and can be recycling goes out the gas well gas body, thereby reduces cost and reduce the circulation gas-drilling process system and the method thereof of pollution.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of and can be recycling goes out the gas well gas body, thereby reduces cost and reduce the circulation gas-drilling process system and the method thereof of pollution.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
According to the present invention, a kind of circulation gas-drilling process method is provided, may further comprise the steps:
(1) will be injected in the well behind the gas boosting in the compressed air source unit;
(2) begin to creep into after gas injection finishes;
(3) gas-liquid-solid mixture in the well recycles well and enters three grades of separation and cleaning system;
(4) clean gas after the separation re-injects in the well after supercharging and recycles.
Further, in described step (3), landwaste and liquid that isolation of purified at different levels system discharges all directly are discharged in the sediment outflow pond.
Further, three grades of separation and cleaning system are made up of the fast subsystem of one-level inertia, secondary cyclone separation system and three grades of fine filtering systems.
Further, the fast subsystem of described one-level inertia is used for rough segmentation, desanding; Described secondary cyclone separation system is used for segmentation, desilt; And described three grades of fine filtering systems are used to separate molecule.
Further, the fast subsystem of one-level inertia can be removed the particle of particle diameter greater than 0.1mm.
Further, the secondary cyclone separation system can be removed the particle of particle diameter greater than 10 μ m.
Further, the particle of particle diameter greater than 3 μ m can be removed by three grades of fine filtering systems.
Further, gas is nitrogen, natural gas or tail gas.
Further, use compressor to carry out gas boosting in the described step (1).
Further, the exit gas of described compressor is injected in the well that reinjects behind the supercharger secondary booster.
By means of the present invention, can realize following beneficial effect:
1. the advantage that has kept existing gas drilling technology;
2. can realize recycling of gas, reduce gas usage, save the energy;
Reduce the input of gas preparation facilities on the one hand, reduced drilling cost; Reduced pressure requirement simultaneously, expanded the gas drilling range of application the natural air-air source well; Reduce environment pollution, improve well site environment and condition of work.
Other advantages of the present invention, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on being conspicuous to those skilled in the art, perhaps can obtain instruction from the practice of the present invention to investigating hereinafter.Target of the present invention and other advantages can be passed through following manual, claims, and the specifically noted structure realizes and obtains in the accompanying drawing.
Description of drawings
In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing, wherein:
Fig. 1 is according to gas circulation well system process flow diagram of the present invention; And
Fig. 2 is a representative gases drilling process system workflow schematic diagram in the prior art.
The specific embodiment
Representative gases drilling technology at present commonly used as shown in Figure 2, its technological process is as follows:
Source of the gas: can adopt air, nitrogen, natural gas or tail gas.If employing nitrogen needs special big capacity nitrogen-making device; If the employing natural gas need have the sufficiently high natural air-air source well of pressure near institute's drilling well; If employing tail gas needs special tail gas generator and produces tail gas.
Compressor: gas is compressed, generally can increase to about 2.4MPa.If well is superficial, the gas of compressor outlet directly can be injected into well.Deep when well, when required pressure is higher, then need further supercharging.
Supercharger:, generally can increase to tens MPa to the further supercharging of gas.The height of pressure is decided according to the needs of institute's drilling well.
Gas is gone into well: the gas after the supercharging injects into well by standpipe, returns out ground from annular space then.The gas of this moment mixes with landwaste, downhole fluid.
The well head discharging: no matter adopt which kind of gas, current processing mode all is directly discharging or burning.
Current gas drilling technology mode has the following disadvantages:
Contaminated environment: gas drilling well head effluent contains a large amount of dust, directly is discharged in the atmosphere and can causes air pollution.Run in to put or burn and all can cause certain pollution and gas that is adopted and down-hole go out natural gas straight.
Increase cost: as adopting nitrogen, then jumbo nitrogen-making device cost costliness is an example with the nitrogen-making device of 30Nm3/min, and its cost is about about 3,000,000 RMB.As adopt tail gas, and then need to consume a large amount of diesel oil to produce tail gas, be example with the Z12V90 diesel engine, the oil mass of per minute consumption is 3.5Kg, the consumption of every day is greatly about more than 5 tons.As adopt natural gas, and then need the sufficiently high source of the gas well of close together and pressure, whenever bung down and consume tens side's natural gases at least.
This shows that in the present gas drilling operation, the gas that goes out well all directly discharges or put combustion, do not carry out recyclingly, therefore, caused the waste of resource and the increase of cost to a certain extent.If gas circulation can be used, then can reduce gas usage greatly, thereby significantly reduce the cost of gas drilling.
The objective of the invention is to set up circulation gas-drilling process system.Effectively separate by the gas-liquid-solid mixture that well head is returned out, the gas after the separation refills in the well and recycles, and reduces gas usage, and liquid and cutting grain after separating are discharged into the sediment outflow pond.And then reach reduction gas drilling cost, reduce the purpose of environment pollution.
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.It should be noted that embodiment according to gas drilling technology mode of the present invention as just example, but the invention is not restricted to this specific embodiment.
According to the present invention, will be injected in the well behind the gas boosting in the compressed air source unit; After finishing, gas injection begins to creep into; Gas-liquid-solid mixture in the well recycles well and enters three grades of separation and cleaning system; Clean gas after the separation re-injects in the well after supercharging and recycles.Effectively separate by the gas-liquid-solid mixture that well head is returned out, gas after the separation refills in the well and recycles, reduce gas usage, and liquid and cutting grain after separating are discharged into the sediment outflow pond, finally reduce the gas drilling cost, reduce the purpose of environment pollution by recycling the reaching of gas.
Wherein three grades of separation and cleaning system are the cores of circulation gas-drilling process system of the present invention.Three grades of cleaning systems of the present invention are divided into the fast subsystem of inertia, cyclone separation system and fine filtering system.
The major function of the fast subsystem of inertia of three grades of cleaning systems of the present invention is rough segmentation, desanding, removes the particle that particle diameter surpasses 0.1mm, its inlet gas scooter 16m/s; Intensity reaches 0.6MPa; Weight 160kg; Wall thickness 6mm.
The cyclone separation system of three grades of cleaning systems of the present invention, major function is removed the particle of particle diameter greater than 10 μ m for segmentation, desilt; Inlet gas scooter 20m/s; Intensity reaches 0.6MPa; Weight 150kg; Wall thickness 6mm.
The particle of particle diameter greater than 3 μ m removed by the fine filtering system of three grades of cleaning systems of the present invention, major function; Intensity can reach 1.0MPa; Weight 1000kg; Wall thickness: 36mm.
Next with reference to Fig. 1, technological process is described in detail to gas circulation well system of the present invention.
Applicable media of the present invention comprises: nitrogen, natural gas, tail gas.If adopt nitrogen as circulatory mediator, then need to use the nitrogen-making device of low capacity to get final product; If adopt natural gas as circulatory mediator, then need the pipeline that connects from the source of the gas well; If employing tail gas then needs the tail gas generator.Because gas changes into and recycling, therefore, institute's gas consumption can reduce significantly.
Referring to Fig. 1, its concrete operations step is:
1, source of the gas is prepared: according to the difference of gas medium, start corresponding apparatus.
(1) adopts nitrogen, then start the low capacity nitrogen-making device and prepare nitrogen;
(2) if adopt natural gas, then open source gas line;
(3), then start the tail gas generator and produce tail gas if adopt tail gas.
2, gas carries out the one-level supercharging by compressor, according to the pressure requirement of drilling design, determines whether compressor outlet gas directly injects into well, or enters in the well that reinjects behind the supercharger secondary booster.In addition, for gas drilling,, can directly inject into well if the source of the gas well pressure is enough high.If the source of the gas well pressure is not enough to satisfy the pressure requirement of drilling design, then can determine whether to enter compressor and supercharger according to actual needs;
3, continue gas injection in well,, begin to creep into when tolerance in the well reaches when creeping into institute's air demand;
4, in the drilling process, after gas-liquid-solid mixture recycles well, be introduced into inertia and divide device soon, remove the particle of particle diameter greater than 0.1mm;
5, enter the secondary cyclonic separation through the fast gas that divides of one-level inertia, remove the particle of particle diameter greater than 10 μ m;
6, the gas through the secondary cyclonic separation enters strainer, removes the particle that particle diameter surpasses 3 μ m;
7, after the clean gas after separating enters compressor, supercharger supercharging, re-inject in the well and recycle;
8, the isolation of purified at different levels system landwaste and the liquid of discharging directly enters the sediment outflow pond.
9, in the drilling process, compressed air source unit works on, to remedy the tolerance loss in the drilling process.
Below will the preferred embodiments of the present invention be explained in further detail respectively at nitrogen, natural gas and tail gas situation as circulatory mediator.
Embodiment one: adopt nitrogen as circulatory mediator
1, source of the gas is prepared: start the low capacity nitrogen-making device and prepare nitrogen;
2, gas carries out the one-level supercharging by compressor, according to the pressure requirement of drilling design, determines whether compressor outlet gas directly injects into well, or enters in the well that reinjects behind the supercharger secondary booster;
3, continue gas injection in well,, begin to creep into when tolerance in the well reaches when creeping into institute's air demand;
4, in the drilling process, after gas-liquid-solid mixture recycles well, be introduced into inertia and divide device soon, remove the particle of particle diameter greater than 0.1mm;
5, enter the secondary cyclonic separation through the fast gas that divides of one-level inertia, remove the particle of particle diameter greater than 10 μ m;
6, the gas through the secondary cyclonic separation enters strainer, removes the particle that particle diameter surpasses 3 μ m;
7, after the clean gas after separating enters compressor, supercharger supercharging, re-inject in the well and recycle;
8, the isolation of purified at different levels system landwaste and the liquid of discharging directly enters the sediment outflow pond.
9, in the drilling process, compressed air source unit works on, to remedy the tolerance loss in the drilling process.
Embodiment two: adopt natural gas as circulatory mediator
1, source of the gas is prepared: open source gas line;
If 2 source of the gas well pressures are enough high, can directly inject into well.If the source of the gas well pressure is not enough to satisfy the pressure requirement of drilling design, then can determine whether to enter compressor and supercharger according to actual needs;
3, continue gas injection in well,, begin to creep into when tolerance in the well reaches when creeping into institute's air demand;
4, in the drilling process, after gas-liquid-solid mixture recycles well, be introduced into inertia and divide device soon, remove the particle of particle diameter greater than 0.1mm;
5, enter the secondary cyclonic separation through the fast gas that divides of one-level inertia, remove the particle of particle diameter greater than 10 μ m;
6, the gas through the secondary cyclonic separation enters strainer, removes the particle that particle diameter surpasses 3 μ m;
7, after the clean gas after separating enters compressor, supercharger supercharging, re-inject in the well and recycle;
8, the isolation of purified at different levels system landwaste and the liquid of discharging directly enters the sediment outflow pond.
9, in the drilling process, can intermittently open source gas line, to remedy the tolerance loss in the drilling process.
Embodiment three: adopt tail gas as circulatory mediator
1, source of the gas is prepared: start the tail gas generator and produce tail gas;
2, gas carries out the one-level supercharging by compressor, according to the pressure requirement of drilling design, determines whether compressor outlet gas directly injects into well, or enters in the well that reinjects behind the supercharger secondary booster;
3, continue gas injection in well,, begin to creep into when tolerance in the well reaches when creeping into institute's air demand;
4, in the drilling process, after gas-liquid-solid mixture recycles well, be introduced into inertia and divide device soon, remove the particle of particle diameter greater than 0.1mm;
5, enter the secondary cyclonic separation through the fast gas that divides of one-level inertia, remove the particle of particle diameter greater than 10 μ m;
6, the gas through the secondary cyclonic separation enters strainer, removes the particle that particle diameter surpasses 3 μ m;
7, after the clean gas after separating enters compressor, supercharger supercharging, re-inject in the well and recycle;
8, the isolation of purified at different levels system landwaste and the liquid of discharging directly enters the sediment outflow pond.
9, in the drilling process, compressed air source unit works on, to remedy the tolerance loss in the drilling process.
In sum, circulation gas-drilling process system according to the present invention has kept the advantage of existing gas drilling technology; Can realize recycling of gas, reduce gas usage, energy conservation; Reduce the input of gas preparation facilities, reduced drilling cost; Reduced pressure requirement, expanded the gas drilling range of application the natural air-air source well; Reduce environment pollution, improve well site environment and condition of work.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1. circulation gas-drilling process method is characterized in that may further comprise the steps:
(1) will be injected in the well behind the gas boosting in the compressed air source unit;
(2) begin to creep into after gas injection finishes;
(3) gas-liquid-solid mixture in the well recycles well and enters three grades of separation and cleaning system; And
(4) clean gas after the separation re-injects in the well after supercharging and recycles.
2. circulation gas-drilling process method according to claim 1 is characterized in that in described step (3): landwaste and liquid that isolation of purified at different levels system discharges all directly are discharged in the sediment outflow pond.
3. circulation gas-drilling process method according to claim 1 and 2 is characterized in that described three grades of separation and cleaning system be made up of the fast subsystem of one-level inertia, secondary cyclone separation system and three grades of fine filtering systems.
4. circulation gas-drilling process method according to claim 3 is characterized in that the fast subsystem of described one-level inertia is used for rough segmentation, desanding; Described secondary cyclone separation system is used for segmentation, desilt; And described three grades of fine filtering systems are used to separate molecule.
5. circulation gas-drilling process method according to claim 4 is characterized in that the fast subsystem of described one-level inertia is used to remove the particle of particle diameter greater than 0.1mm.
6. circulation gas-drilling process method according to claim 4 is characterized in that described secondary cyclone separation system is used to remove the particle of particle diameter greater than 10 μ m.
7. circulation gas-drilling process method according to claim 4 is characterized in that described three grades of fine filtering systems are used to remove the particle of particle diameter greater than 3 μ m.
8. circulation gas-drilling process method according to claim 1 and 2 is characterized in that described gas is nitrogen, natural gas or tail gas.
9. circulation gas-drilling process method according to claim 1 and 2 is characterized in that using in the described step (1) compressor or supercharger to carry out gas boosting.
10. circulation gas-drilling process method according to claim 9 is characterized in that when needs improve gas injection pressure, in the well that reinjects behind the compressor outlet gas injection supercharger secondary booster.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103397873A (en) * | 2013-08-16 | 2013-11-20 | 天津凯德实业有限公司 | Well head gas purifying device for natural gas field |
| CN104929513A (en) * | 2014-03-21 | 2015-09-23 | 中国石油化工集团公司 | Microwave-assisted rock-breaking gas-drilling equipment and gas-drilling well wall freezing method |
| CN105041247A (en) * | 2015-08-20 | 2015-11-11 | 淮南矿业(集团)有限责任公司 | Slag-discharge system using nitrogen |
| CN105822222A (en) * | 2016-05-10 | 2016-08-03 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | Well drilling process system and well drilling method for circularly recycling natural gas |
| CN109083622A (en) * | 2018-07-27 | 2018-12-25 | 中国石油大学(北京) | Natural gas cyclic utilization system and gas drilling system |
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| CN103397873A (en) * | 2013-08-16 | 2013-11-20 | 天津凯德实业有限公司 | Well head gas purifying device for natural gas field |
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| CN104929513A (en) * | 2014-03-21 | 2015-09-23 | 中国石油化工集团公司 | Microwave-assisted rock-breaking gas-drilling equipment and gas-drilling well wall freezing method |
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| CN105822222A (en) * | 2016-05-10 | 2016-08-03 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | Well drilling process system and well drilling method for circularly recycling natural gas |
| CN109083622A (en) * | 2018-07-27 | 2018-12-25 | 中国石油大学(北京) | Natural gas cyclic utilization system and gas drilling system |
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Application publication date: 20100113 |