WO2014206122A1 - 一种可控注气点注气装置、注气工艺及气化方法 - Google Patents
一种可控注气点注气装置、注气工艺及气化方法 Download PDFInfo
- Publication number
- WO2014206122A1 WO2014206122A1 PCT/CN2014/074200 CN2014074200W WO2014206122A1 WO 2014206122 A1 WO2014206122 A1 WO 2014206122A1 CN 2014074200 W CN2014074200 W CN 2014074200W WO 2014206122 A1 WO2014206122 A1 WO 2014206122A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gasification
- gas injection
- oxygen
- gas
- channel
- Prior art date
Links
- 238000002309 gasification Methods 0.000 title claims abstract description 247
- 238000002347 injection Methods 0.000 title claims abstract description 162
- 239000007924 injection Substances 0.000 title claims abstract description 162
- 238000000034 method Methods 0.000 title claims abstract description 106
- 230000008569 process Effects 0.000 title claims abstract description 59
- 239000007789 gas Substances 0.000 claims abstract description 190
- 239000003245 coal Substances 0.000 claims abstract description 96
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 92
- 239000001301 oxygen Substances 0.000 claims abstract description 92
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 92
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 67
- 238000002485 combustion reaction Methods 0.000 claims abstract description 34
- 238000005516 engineering process Methods 0.000 claims abstract description 34
- 238000005553 drilling Methods 0.000 claims abstract description 31
- 239000000203 mixture Substances 0.000 claims description 23
- 238000012545 processing Methods 0.000 claims description 21
- 238000004519 manufacturing process Methods 0.000 claims description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 17
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000001569 carbon dioxide Substances 0.000 claims description 8
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 239000011148 porous material Substances 0.000 claims description 8
- 238000007537 lampworking Methods 0.000 claims description 7
- 229910001868 water Inorganic materials 0.000 claims description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 6
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 4
- 229910001882 dioxygen Inorganic materials 0.000 claims description 4
- 238000005065 mining Methods 0.000 claims description 4
- 239000003034 coal gas Substances 0.000 claims description 3
- 239000011368 organic material Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000011152 fibreglass Substances 0.000 claims description 2
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 claims description 2
- 238000005262 decarbonization Methods 0.000 claims 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 claims 1
- 230000001276 controlling effect Effects 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 230000002093 peripheral effect Effects 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 230000032258 transport Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000002269 spontaneous effect Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- 229910000619 316 stainless steel Inorganic materials 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000009841 combustion method Methods 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000003077 lignite Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- LALRXNPLTWZJIJ-UHFFFAOYSA-N triethylborane Chemical compound CCB(CC)CC LALRXNPLTWZJIJ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/243—Combustion in situ
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal drilling
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/06—Deflecting the direction of boreholes
Definitions
- the invention relates to the technical field of coal resource development, in particular to a gas injection device with a controlled gas injection point, a gas injection process and a gasification method.
- the well-less underground coal gasification technology mainly uses directional drilling and reverse combustion technology to construct a gasification channel, and then injects air and oxygen/steam gasification agents for underground gasification to produce gas.
- the advantage is that the single furnace has a large gas output; the disadvantage is that the position of the gasification combustion zone is unstable, the gasification agent leakage rate is high, and the channel is too long to increase the auxiliary auxiliary air inlet hole.
- CRIP controlled injection point retreat gasification process
- the injection hole is advanced, as shown in Figure 1.
- the igniter ignites the propane nozzle with a pilot gas silane and moves on the ground.
- the underground gasification test design of the Turin underground in Belgium uses a double-layered casing, and the coil moves inside the flexible casing.
- the coil contains three thermocouple wires and two flammable hollow tubes.
- One hollow tube transports triethylboron (burning in the air) and CH 4 , and the other hollow tube is filled with oxygen, and the igniter is fixed at the end of the coil.
- the advantage of the CRIP process is that the gasification process can be effectively controlled.
- the main disadvantage is that the process requires multiple ignitions of the coal seam at different distances in the directional well to ignite the coal seam and then gasify. Due to the discontinuous movement of the gas injection point, the gasification process is stable. The performance is poor, and the structure of the ignition gas injection device is complicated, the cost is high, the ignition process is complicated, the control is difficult, and the safety factor is low.
- the object of the present invention is to solve a series of problems such as the multiple ignition of the retreating process of the conventional well-less underground gasification controlled injection point, the complicated device, the discontinuous movement of the gas injection point, and the poor stability of the gasification process.
- the invention also provides a controllable gas injection point gas injection device and a gas injection process.
- the invention is based on directional drilling and coiled tubing technology, realizes the movement of the gas injection point by using the directional drilling and the coiled tubing to cooperate, and adjusts the principle of the gasification agent injection parameter to control the reverse combustion, thereby controlling the positional movement and combustion of the flame working surface.
- Speed the purpose of reverse combustion of underground coal seams for ignition and gasification.
- the gas injection device comprises a directional well channel, wherein the directional well channel is provided with a coiled tubing, the coiled tubing is connected to an oxygen/oxygen-rich gas pipeline; and the coiled tubing of the coiled tubing and the directional well channel is connected to the auxiliary gasifying agent pipeline And a steam line; the starting end of the coiled tubing is provided with a gas injection well head, and a nozzle is arranged at the end.
- the coiled tubing is sealed into the well by a blowout preventer (box).
- box blowout preventer
- a second object of the present invention is to provide a controlled gas injection point gasification gas injection process for transporting oxygen/oxygen-enriched gas from a coiled tubing disposed in a directional well passage, the oxygen/oxygen-rich gas
- the auxiliary gasifying agent conveyed by the annulus between the coiled tubing and the directional well wall is uniformly mixed at the nozzle position at the end of the coiled tubing, and the mixed gasifying agent enters the predetermined gasification position of the coal seam through the directional well passage or the pore passage in the coal seam.
- the oxygen/oxygen-enriched gas and the auxiliary gasifying agent are mixed at the nozzle position at the end of the coiled tubing, that is, in the bore or channel.
- the gas injection position change can be realized by controlling the continuous oil pipe and the nozzle movement by the lifting and lowering actions.
- the directional well channel of the present invention is formed by a directional drilling method.
- Directional drilling technology is one of the most advanced drilling technologies in the world's petroleum exploration and development. It is made up of special downhole tools, measuring instruments and processes.
- the technique of effectively controlling the well trajectory and drilling the drill bit to a predetermined target in the specific direction is currently widely used in oilfield development.
- the use of directional drilling technology can economically and effectively develop oil and gas resources with limited ground and underground conditions, which can greatly increase oil and gas production and reduce drilling costs, and is conducive to the protection of the natural environment, with significant economic and social benefits.
- the directional drilling method of the present invention preferably uses directional well technology, horizontal well technology, side drilling technology, radial horizontal well technology, branch well technology, cluster well technology or large displacement well technology in petroleum or coalbed methane drilling technology. Any of them.
- the directional well channel length is greater than 10 m.
- the directional well channel of the present invention is an unsupported channel or a supporting channel. In actual implementation, depending on factors such as coal rock and geological conditions, whether to support the channel is determined.
- the support channel is provided with screen support and/or casing support, preferably screen support or combination of screen and casing.
- screen support and/or casing support preferably screen support or combination of screen and casing.
- factors such as the strength of the sheath tube, the pinch of the coal seam, and the coal seam water, which may affect the speed of the reverse combustion.
- Different support methods can be selected.
- the contact area of the gasifying agent with the coal seam to be ignited is increased, and the combination of the screen support or the screen + casing is generally combined.
- the support tube material is an ablatable material, further preferably an organic material, most preferably FRP or
- PE pipe In the implementation process, factors such as strength and combustion characteristics are considered, and organic materials such as glass steel and PE pipes are preferred.
- the oxygen/oxygen-enriched gas is provided by a gasification agent preparation system.
- the oxygen-rich gas is a gas mixture of oxygen and one or both of nitrogen, carbon dioxide, wherein the volume concentration of oxygen is greater than 21%.
- the auxiliary gasifying agent is one or a mixture of at least two of nitrogen, carbon dioxide or water. Those skilled in the art can choose to consist of one or two gases depending on the gas injection requirements.
- the nitrogen is provided by an oxygen plant; the carbon dioxide is provided by a decarburization device.
- the auxiliary gasifying agent functions as: one, participates in the gasification underground gasification reduction reaction, such as co 2 , 3 ⁇ 40, etc.; the second and the oxygen/oxygen-rich gas The oxygen concentration of the mixed gasification agent is lowered to protect the gasification process and equipment.
- the oxygen content in the auxiliary gasifying agent transported between the coiled tubing and the directional well wall is determined by the lower limit oxygen concentration of coal spontaneous combustion.
- the volumetric concentration of oxygen in the auxiliary gasification agent is generally required to be less than 5%.
- the coiled tubing and nozzle of the present invention can select the molding materials and equipment of the current oil and gas industry.
- the coiled tubing is mainly selected from the process parameters such as oxygen concentration, pressure and flow rate of the transport gasifier, and different pressure grades, pipeline materials and diameters are selected to reduce the overall cost.
- the pore passage in the coal seam of the present invention is formed by an artificial drilling and fracturing process, or is formed by the coal seam under the influence of combustion heat.
- a third object of the present invention is to provide two methods for controlling a gas injection point gasification using the above gas injection process.
- the first controllable gas injection point gasification method wherein the method moves the coiled gas to the predetermined gasification position by moving the coiled tubing in stages, and then adjusts the gas injection process parameters for reverse ignition and gasification passage processing. Gasification production.
- the gasification method comprises the following steps:
- the position of the gas injection point is moved to the predetermined gasification position by moving the coiled tubing in stages;
- step 2) proceed to the next section of gasification channel processing, and complete the underground gasification of the coal seam in the predetermined area according to steps 3) and 4), and then cycle until the coal resources are gasified along the peripheral side of the directional well channel.
- the gas injection point position segment movement distance is 10 to 150 m.
- the flow rate of the gasifying agent during the igniting and processing of the gasification passage is controlled at 300 to 3000 square meters/hour.
- the volume concentration of oxygen in the gasifying agent is 21 to 55%.
- the injection point movement is judged based on the amount of coal (M), the calorific value of the gas, and the fluctuation of the composition.
- M amount of coal
- the calorific value of the gas the calorific value of the gas
- the fluctuation of the composition the standard of mobile operation is determined as follows: The gasification rate of the gasification coal to be gasified coal seam is greater than 50%, and the calorific value and composition decrease by more than 20% of the normal average value. mobile.
- the invention provides another controllable gas injection point gasification method, wherein the continuous gas pipe is continuously or intermittently lifted to realize continuous movement of the gas injection point position to a predetermined gasification position, and then the gas injection process parameters are adjusted for reverse ignition and gas. Chemical channel processing and gasification production.
- the gasification method comprises the following steps:
- the gas injection point is continuously moved to the predetermined gasification position by continuously or intermittently lifting the coiled tubing according to the gas injection process;
- Step 2 The gasification agent flow rate is controlled to be greater than 2000 square / hour; preferably, the volume concentration of oxygen in the gasification agent is 21 to 95% ;
- water vapor or water may be injected to adjust the temperature of the gasification zone and the gas quality.
- the “may” means “capable”.
- the moving speed of the gas injection point is judged based on the coal burning speed (m), the gas heat value and the composition fluctuation.
- the general movement criterion for the process operation is: When the gasification rate ( ⁇ ) of the coal seam reserve (T) to be gasified in the gasification channel is greater than 50%, the calorific value and composition decrease.
- controllable gas injection point gasification method of the present invention specifically comprises the following steps:
- an auxiliary gasifying agent is injected into the annular space between the coiled tubing and the directional well wall to replace the channel, and then the oxygen/oxygen-rich gas is injected into the coiled tubing;
- the oxygen/oxygen-enriched gas is sent from the nozzle through the coiled tubing, and the auxiliary gasifying agent transported with the annulus is uniformly mixed at the predetermined gasification position. After the mixing, the gasifying agent enters the predetermined pilot fire through the directional well passage or the pore passage in the coal seam.
- the gas injection device of the present invention adopts directional drilling and coiled tubing technology to control the movement of the injection point position, and can stably adjust the gasification agent injection parameters.
- the gas injection point can realize any distance movement in the directional well channel according to requirements, and can reduce the coal seam gasification combustion blind zone on the circumferential side of the channel, thereby effectively improving the gasification recovery rate of coal along the directional well channel.
- the use of coiled tubing and directional wall-to-wall annulus transport auxiliary gasifier can effectively prevent spontaneous combustion of the channel coal seam and tempering of the gas injection pipeline, and form a gasification agent at the injection point (nozzle position), which can be continuously controlled.
- the implementation process of the gasification method of the present invention does not need to set the ignition device at the gas injection point for individual ignition, but uses the control gasification agent injection parameter (oxygen concentration, flow rate, pressure) to carry out the reverse combustion of the gasification channel, and quickly ignite and process.
- the position of the gas injection point is continuous and the stability of the gasification process is high.
- Figure 1 is a schematic diagram of a conventional well-free CRIP technology
- Figure 2 is a schematic view of a gasification furnace using controlled injection gasification
- FIG. 3 is an underground gasification furnace with a supporting structure in a horizontal section of a directional well channel according to Embodiment 1;
- FIG. 4 is a schematic diagram (planar section) of a moving gasification process of a controlled injection point in Embodiment 1;
- 5 is an underground gasification furnace of a horizontal hole structure (without support structure) of a horizontal section of a directional well channel according to Embodiment 2.
- 1-tubular drum 2-injection wellhead; 3-coiled tubing; 4-nozzle; 5-glass steel screen; 6-directional well channel; 7-gasification combustion zone; 8-coal top plate; 10 vertical gas wells; 11-7 bare wells.
- a controllable gas injection point gas injection device comprises a directional well channel 6, wherein the directional well channel 6 is provided with a coiled tubing 3; the coiled tubing 3 is connected with an oxygen/oxygen-rich gas pipeline; The annulus of the coiled tubing 3 and the directional well passage 6 communicates with the auxiliary gasifying agent line and the steam line; the leading end of the coiled tubing 3 is provided with a gas injection well head 2, and a nozzle 4 is provided at the end.
- the tubing drum 1 is used for the bearing of the coiled tubing 3.
- a controllable gas injection point gas injection process wherein the gas injection process transports oxygen/oxygen-rich gas from a coiled tubing disposed in a directional well passage, the oxygen/oxygen-rich gas and an annulus between the coiled tubing and the directional wellbore
- the transported auxiliary gasifying agent is uniformly mixed at the nozzle position at the end of the coiled tubing, and the mixed gasifying agent enters the predetermined gasification position of the coal seam through the directional well passage or the pore passage in the coal seam.
- the directional well channel is formed by a directional drilling method; the directional drilling method preferably uses directional well technology, horizontal well technology, side drilling technology, and radial horizontal well technology in petroleum or coalbed methane drilling technology Any one of a technique, a branch well technique, a cluster well technique, or a large displacement well technique, the directional well channel length being greater than 10 m.
- the pore channels in the coal seam are formed by artificial drilling, fracturing processes, or formed by coal seams under the influence of combustion heat.
- the directional well channel is an unsupported channel or has a support channel.
- the support channel is supported by screen support and/or casing support, preferably screen support or combination of screen and casing.
- the support tube material is an ablatable material, further preferably an organic type material, most preferably a glass steel or PE tube.
- the oxygen/oxygen-enriched gas is provided by a gasification agent preparation system.
- the oxygen-rich gas is a gas mixture of oxygen and one or both of nitrogen, carbon dioxide, wherein the volume concentration of oxygen is greater than 21%.
- the auxiliary gasifying agent is one or a mixture of at least two of nitrogen, carbon dioxide or water vapor.
- the nitrogen is provided by an oxygen plant that is provided by a decarburization device.
- a controllable gas injection point gasification method wherein the method moves the coiled gas to a predetermined gasification position by moving the coiled tubing in stages, and then adjusting the gas injection process parameters for reverse ignition, gasification passage processing and gas Production.
- the gasification method comprises the following steps:
- the position of the gas injection point is moved to the predetermined gasification position by moving the coiled tubing in stages;
- step 2) proceed to the next section of gasification channel processing, and complete the underground gasification of the coal seam in the predetermined area according to steps 3) and 4), and then cycle until the coal resources in the peripheral side of the directional well channel are gasified and exploited.
- the gas injection point position segment movement distance is 10 ⁇ 150 m; the gasification agent flow rate during the gasification channel ignition and processing is controlled at 300 ⁇ 3000 square/hour; the volume concentration of oxygen in the gasification agent It is 21 ⁇ 55%.
- a controllable gas injection point gasification method wherein the continuous gas pipe is continuously or intermittently raised to realize continuous movement of the gas injection point position to a predetermined gasification position, and then the gas injection process parameters are adjusted for reverse ignition, gasification channel processing and gas Production.
- the gasification method comprises the following steps:
- the gas injection point is continuously moved to the predetermined gasification position by continuously or intermittently lifting the coiled tubing according to the gas injection process;
- step 2) the gasification agent flow rate is controlled to be greater than 2000 square / hour; the volume concentration of oxygen in the gasification agent is 21 to 95%; when the volume concentration of oxygen is greater than 60%, water vapor may be injected or The water regulates the temperature and gas quality of the gasification zone.
- controllable gas injection point gasification method of the present invention is applied to a brown coal seam having a lower degree of metamorphism. Due to the low strength of the coal seam lithology, it is easy to collapse and shrink the pores. In this example, the directional horizontal well structure supported by the FRP screen is selected. In addition to having the general advantages of the present invention, it is more advantageous for improving the drilling stability and reducing the drilling accident rate.
- the underground gasifier has a buried depth of 255 m and a top layer of 238 m deep.
- the coal type is Inner Mongolia brown coal.
- the gasifier includes a directional well passage 6, a vertical gas outlet well 10, and a gasification combustion passage.
- the directional well channel 6 has a diameter of 177.8mm, and the horizontal section of the coal seam supports the FRP screen.
- the diameter of the glass fiber reinforced plastic screen is 139.7mm, the length is 300m, and the opening ratio is 15%.
- the controllable gas injection point gas injection device comprises: coiled tubing 3 (diameter 66.7mm, pressure grade 6.0MPa, material: 316 stainless steel); gas injection well head 2, including: coiled tubing operation blowout prevention box (single side door type) and coiled tubing Injection head (ZRT series coiled tubing injection head); Nozzle 4 (diameter 65mm, high temperature 1200 °C).
- the coal seam in which the directional well channel 6 of the underground gasifier is located is gasified by a gas injection device.
- the gasification furnace gasification operation pressure is 1.5 MPa, and the synthesis gas is produced by gasification using a 02 /C0 2 gasification agent.
- the gasifier is successfully ignited and a stable gasification combustion zone 7 is established in the vent area, the directional well channel 6 is established in the predetermined gasification coal layer by directional drilling technology, and then the gasification production of the controlled gas injection point is performed.
- the specific process and implementation steps are as follows: (1) The coiled tubing is sent through the gas injection well head 2 along the directional well passage 6 to the predetermined gasification position A by the injection head device, and the oxygen nozzle is prevented from being directly sent into the fire zone; The coil is injected between the coiled tubing and the directional well wall to inject C0 2 to replace the channel.
- the initial flow control is 300 ⁇ 400Nm 3 /h .
- the gasification dose of reverse ignition and processing channel is 500 ⁇ 3000Nm 3 /h, and the oxygen concentration is 25 ⁇ 35%; (5) After the channel is ignited and processed, gradually increase the gas injection volume of the gasification agent to 4000 ⁇ 6000Nm 3 /h, oxygen concentration 60 ⁇ 70%, carry out underground gasification scale gas production; (6) When the gasification position of the gasification position is finished, determine whether to stop or reduce injection gasification according to the amount of coal, coal gas calorific value and composition of gasification And start the injection head device to move the coiled tubing 3 to move the oxygen injection point to the next predetermined gasification position B, the predetermined gasification position AB spacing 0 ⁇ 100m; (7) according to steps (2) - (4) According to steps (4) and (5), the underground gasification of the coal in the predetermined area is completed, and the circulation is continued until the coal resources in the 6-side side of the directional well channel are gasified and mined.
- controllable gas injection point gasification method according to the present invention is applied to a lean coal seam having a high degree of metamorphism. Since the coal seam has good lithology and high strength, this embodiment selects an unoriented horizontal well structure. In addition to the general advantages of the present invention, it is more advantageous in reducing the cost of building a furnace and improving the efficiency of coal seam ignition.
- the underground gasifier shown in Figure 5 above has a buried floor depth of 957 meters and a coal seam roof of 8 meters deep.
- the coal type is lean coal in Shanxi.
- the gasifier includes a directional well passage 6, a vertical outlet well 10, and a gasification combustion passage.
- the directional well channel 6 has a diameter of 177.8 mm, and the horizontal well bare hole section 11 (the coal seam section horizontal well is an unsupported bare hole) is 200 meters long.
- the controllable gas injection point gas injection device comprises: coiled tubing 3 (diameter 50.8mm, pressure grade 6.0MPa, material: 316 stainless steel, Jiangsu Dongtai Huaxuan Company); gas injection well head 2, including: coiled tubing operation blowout prevention box (single Side door type, Oran Oil Company), coiled tubing injection head (ZRT series coiled tubing injection head, manufacturer Yantai Jerry Company); Nozzle 4 (diameter 50mm, high temperature resistant 1200 °C,
- the coal seam in which the directional well channel 6 of the underground gasifier is located is gasified using a gas injection device as shown in FIG.
- the gasification operation pressure of the gasifier is 2.5 MPa, and the synthesis gas is produced by gasification using a 0 2 /C0 2 gasification agent.
- the gasifier is successfully ignited and a stable gasification combustion zone 7 is established in the vent area, the directional well channel 6 is established in the predetermined gasification coal layer by directional drilling technology, and then the gasification production of the controlled gas injection point is performed.
- the specific process and implementation steps are as follows: (1) The coiled tubing is sent through the gas injection well head 2 along the directional well passage 6 to the predetermined gasification position A by the injection head device, and the oxygen nozzle is prevented from being directly sent into the fire zone; orientation between the coiled tubing and borehole annulus injection C0 2 protective replacement pair of channels, an initial flow control 400 ⁇ 600Nm 3 / h; (3) through the coiled tubing degreased again slow injection of oxygen, the oxygen injected through the air nozzle ring C0 2 mixing; (4) Controlling the total amount of injected gasification agent and oxygen concentration, and gradually moving the flame working surface to a predetermined gasification position by means of reverse combustion, and simultaneously performing gasification passage processing.
- the gasification dose of reverse ignition and processing channel is 600 ⁇ 3500Nm 3 /h, and the oxygen concentration is 25 ⁇ 55%; (5) After the channel is ignited and processed, gradually increase the gas injection volume of the gasification agent to 4000 ⁇ 7500Nm 3 /h, oxygen concentration 60 ⁇ 70%, carry out underground gasification scale gas production; (6) When the gasification position of the predetermined gasification position is over, determine whether to stop or reduce injection gasification according to the amount of coal, coal gas calorific value and composition of gasification.
- the synthesis gas produced by the gasification method of the present invention (the composition of which is 3 ⁇ 4 , CO, CH 4 , C0 2 , 3 ⁇ 40, etc.) is transported to the ground through the vertical gas outlet well 10 and then purified to obtain 3 ⁇ 4, CO, CH. 4 main products.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (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)
- Mechanical Engineering (AREA)
- Air Supply (AREA)
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2014303165A AU2014303165B2 (en) | 2013-06-26 | 2014-03-27 | Gas injection apparatus with controllable gas injection point, gas injection process, and gasification method |
US14/898,489 US20160123128A1 (en) | 2013-06-26 | 2014-03-27 | Gas injection apparatus with controllable gas injection point, gas injection process, and gasification method |
EP14818691.9A EP3015642A1 (en) | 2013-06-26 | 2014-03-27 | Gas injection apparatus with controllable gas injection point, gas injection process, and gasification method |
ZA2015/09226A ZA201509226B (en) | 2013-06-26 | 2015-12-18 | Gas injection apparatus with controllable gas injection point, gas injection process, and gasification method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201310260123.4A CN104251133B (zh) | 2013-06-26 | 2013-06-26 | 一种可控注气点注气装置、注气工艺及气化方法 |
CN201310260123.4 | 2013-06-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2014206122A1 true WO2014206122A1 (zh) | 2014-12-31 |
Family
ID=52140979
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CN2014/074200 WO2014206122A1 (zh) | 2013-06-26 | 2014-03-27 | 一种可控注气点注气装置、注气工艺及气化方法 |
Country Status (6)
Country | Link |
---|---|
US (1) | US20160123128A1 (zh) |
EP (1) | EP3015642A1 (zh) |
CN (1) | CN104251133B (zh) |
AU (1) | AU2014303165B2 (zh) |
WO (1) | WO2014206122A1 (zh) |
ZA (1) | ZA201509226B (zh) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107558978A (zh) * | 2017-08-28 | 2018-01-09 | 新疆国利衡清洁能源科技有限公司 | 稠油开采系统及方法 |
CN107701165A (zh) * | 2016-08-08 | 2018-02-16 | 新疆国利衡清洁能源科技有限公司 | 一种分离控制注气点装置及其控制方法 |
CN111173491A (zh) * | 2020-03-09 | 2020-05-19 | 山东科技大学 | 一种地下气化炉的预控结构、气化炉及气化方法 |
CN115539009A (zh) * | 2022-10-17 | 2022-12-30 | 安徽理工大学 | 一种用于测量煤炭地下气化效率的试验系统及方法 |
CN115539009B (zh) * | 2022-10-17 | 2024-05-31 | 安徽理工大学 | 一种用于测量煤炭地下气化效率的试验系统及方法 |
Families Citing this family (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104806285A (zh) * | 2015-03-25 | 2015-07-29 | 宁夏煤炭勘察工程公司 | 基于地面水平井的煤矿采空区瓦斯治理方法 |
CN105041275A (zh) * | 2015-06-30 | 2015-11-11 | 西南石油大学 | 一种注减氧空气降低采油井伴生气氧浓度的采油方法 |
CN106150472B (zh) * | 2016-08-28 | 2019-05-17 | 中为(上海)能源技术有限公司 | 用于煤炭地下气化工艺的接合管注入系统及操作方法 |
JP6713409B2 (ja) * | 2016-11-18 | 2020-06-24 | 株式会社三井E&Sホールディングス | ガスハイドレート回収装置およびガスハイドレート回収方法 |
WO2018170830A1 (zh) * | 2017-03-23 | 2018-09-27 | 陈信平 | 注高温空气增产煤层气的方法 |
CN107654222A (zh) * | 2017-08-28 | 2018-02-02 | 新疆国利衡清洁能源科技有限公司 | 化石能源开采方法及系统 |
CN108518211B (zh) * | 2018-03-29 | 2024-01-30 | 中为(上海)能源技术有限公司 | 用于煤炭地下气化工艺的氧化剂混合注入系统及操作方法 |
CN108729916A (zh) * | 2018-07-17 | 2018-11-02 | 国氢能源科技有限公司 | 一种地下气化炉煤层点火装置及后退重复点火气化方法 |
CN110821544A (zh) * | 2018-08-14 | 2020-02-21 | 柴乔森 | 矿井内自点火煤孔煤层气化炉式采区 |
CN109779600B (zh) * | 2019-02-27 | 2023-08-01 | 中国矿业大学 | 地下热-气联产气化设备、煤田火区前沿治理系统和方法 |
CN110821463A (zh) * | 2019-11-15 | 2020-02-21 | 中煤地质集团有限公司北京地质调查分公司 | 一种煤层气热采增产方法 |
CN110939424B (zh) * | 2019-11-27 | 2022-04-12 | 西安物华巨能爆破器材有限责任公司 | 一种无井式煤炭地下气化点火方法 |
CN112855111B (zh) * | 2019-11-28 | 2023-04-25 | 中国石油天然气股份有限公司 | 电加热煤层地下气化系统及方法 |
CN111425179A (zh) * | 2020-03-20 | 2020-07-17 | 北京国利衡清洁能源科技(集团)有限公司 | 一种新型点火装置及输送系统 |
CN111677489B (zh) * | 2020-06-02 | 2021-08-31 | 中国矿业大学 | 一种可提高煤炭地下气化效率的多层复合喷嘴装置及其使用方法 |
CN114439453A (zh) * | 2020-10-30 | 2022-05-06 | 中国石油天然气股份有限公司 | 一种原煤原位气化制氢采氢井网和方法 |
CN112253076B (zh) * | 2020-11-26 | 2021-08-31 | 福州大学 | 一种地下硫铁矿的化学开采方法 |
CN112523733B (zh) * | 2020-11-26 | 2022-11-04 | 河南省煤层气开发利用有限公司 | 一种煤层气与煤气化联采区域消突方法 |
CN112796726B (zh) * | 2021-02-03 | 2022-03-25 | 西南石油大学 | 一种用于煤层气井储层裂缝扩展的井下燃爆装置及方法 |
CN115773098A (zh) * | 2021-09-08 | 2023-03-10 | 中国石油天然气股份有限公司 | 煤层和油层叠合区地下煤制气与提高油层采收率的联合开采方法 |
CN113781889B (zh) * | 2021-10-11 | 2023-01-24 | 山东科技大学 | 适应变综掘面的多瓦斯产生、喷射及闭合一体仿真系统 |
CN113653470B (zh) * | 2021-10-21 | 2022-04-29 | 西南石油大学 | 煤层原位制氢和煤层气开发一体化方法及结构 |
CN114215601B (zh) * | 2021-12-31 | 2024-01-26 | 北京派创石油技术服务有限公司 | 利用废弃油井制造氢气的方法 |
CN114718543A (zh) * | 2022-04-19 | 2022-07-08 | 山东科技大学 | 一种实现煤炭地下气化移动注气的管路切断装置及方法 |
CN116904229A (zh) * | 2023-07-28 | 2023-10-20 | 中国矿业大学(北京) | 煤层等离子点火系统和方法 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4092052A (en) * | 1977-04-18 | 1978-05-30 | In Situ Technology, Inc. | Converting underground coal fires into commercial products |
CN101382064A (zh) * | 2008-09-04 | 2009-03-11 | 乌兰察布新奥气化采煤技术有限公司 | 煤炭地下强制氧化点火技术 |
CN102477857A (zh) * | 2010-11-30 | 2012-05-30 | 新奥气化采煤有限公司 | 一种煤炭地下气化贯通方法 |
CN102635346A (zh) * | 2012-04-13 | 2012-08-15 | 北京大学 | 煤炭地下气化移动式点火系统 |
CA2827011A1 (en) * | 2011-02-18 | 2012-08-23 | Linc Energy Ltd | Igniting an underground coal seam in an underground coal gasification process, ucg |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4356866A (en) * | 1980-12-31 | 1982-11-02 | Mobil Oil Corporation | Process of underground coal gasification |
US4436153A (en) * | 1981-12-31 | 1984-03-13 | Standard Oil Company | In-situ combustion method for controlled thermal linking of wells |
US4422505A (en) * | 1982-01-07 | 1983-12-27 | Atlantic Richfield Company | Method for gasifying subterranean coal deposits |
CN1055332C (zh) * | 1995-03-15 | 2000-08-09 | 柴兆喜 | 拉管注气点后退式煤层气化方法 |
CN1061733C (zh) * | 1996-06-27 | 2001-02-07 | 柴兆喜 | 换管注气点后退式煤层气化方法 |
RU2293845C2 (ru) * | 2005-03-30 | 2007-02-20 | Открытое акционерное общество "Промгаз" | Способ регулирования состава газа подземной газификации углей |
CN100351492C (zh) * | 2005-04-05 | 2007-11-28 | 大雁煤业有限责任公司 | 地下气化炉调整控制系统 |
CN101382065B (zh) * | 2008-09-04 | 2012-05-02 | 乌兰察布新奥气化采煤技术有限公司 | 无井式地下气化工艺 |
CN102486085B (zh) * | 2010-12-01 | 2015-06-17 | 新奥气化采煤有限公司 | 一种用于含碳有机质地下气化的气化剂输配系统及工艺 |
-
2013
- 2013-06-26 CN CN201310260123.4A patent/CN104251133B/zh active Active
-
2014
- 2014-03-27 AU AU2014303165A patent/AU2014303165B2/en active Active
- 2014-03-27 US US14/898,489 patent/US20160123128A1/en not_active Abandoned
- 2014-03-27 EP EP14818691.9A patent/EP3015642A1/en not_active Withdrawn
- 2014-03-27 WO PCT/CN2014/074200 patent/WO2014206122A1/zh active Application Filing
-
2015
- 2015-12-18 ZA ZA2015/09226A patent/ZA201509226B/en unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4092052A (en) * | 1977-04-18 | 1978-05-30 | In Situ Technology, Inc. | Converting underground coal fires into commercial products |
CN101382064A (zh) * | 2008-09-04 | 2009-03-11 | 乌兰察布新奥气化采煤技术有限公司 | 煤炭地下强制氧化点火技术 |
CN102477857A (zh) * | 2010-11-30 | 2012-05-30 | 新奥气化采煤有限公司 | 一种煤炭地下气化贯通方法 |
CA2827011A1 (en) * | 2011-02-18 | 2012-08-23 | Linc Energy Ltd | Igniting an underground coal seam in an underground coal gasification process, ucg |
CN102635346A (zh) * | 2012-04-13 | 2012-08-15 | 北京大学 | 煤炭地下气化移动式点火系统 |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107701165A (zh) * | 2016-08-08 | 2018-02-16 | 新疆国利衡清洁能源科技有限公司 | 一种分离控制注气点装置及其控制方法 |
CN107558978A (zh) * | 2017-08-28 | 2018-01-09 | 新疆国利衡清洁能源科技有限公司 | 稠油开采系统及方法 |
CN111173491A (zh) * | 2020-03-09 | 2020-05-19 | 山东科技大学 | 一种地下气化炉的预控结构、气化炉及气化方法 |
CN111173491B (zh) * | 2020-03-09 | 2023-09-19 | 山东科技大学 | 一种地下气化炉的预控结构、气化炉及气化方法 |
CN115539009A (zh) * | 2022-10-17 | 2022-12-30 | 安徽理工大学 | 一种用于测量煤炭地下气化效率的试验系统及方法 |
CN115539009B (zh) * | 2022-10-17 | 2024-05-31 | 安徽理工大学 | 一种用于测量煤炭地下气化效率的试验系统及方法 |
Also Published As
Publication number | Publication date |
---|---|
CN104251133B (zh) | 2018-02-23 |
EP3015642A1 (en) | 2016-05-04 |
AU2014303165A1 (en) | 2016-01-21 |
CN104251133A (zh) | 2014-12-31 |
ZA201509226B (en) | 2019-12-18 |
US20160123128A1 (en) | 2016-05-05 |
AU2014303165B2 (en) | 2016-09-22 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2014206122A1 (zh) | 一种可控注气点注气装置、注气工艺及气化方法 | |
CN103437748B (zh) | 煤炭地下气化炉、以及煤炭地下气化方法 | |
CN102477857B (zh) | 一种煤炭地下气化贯通方法 | |
CN104563991B (zh) | 一种煤炭地下气化炉的气化方法 | |
CN208702397U (zh) | 一种煤炭地下气化注气钻孔装置 | |
CN208564527U (zh) | 一种多方位u型对接井构建的煤地下气化炉 | |
CN107939370A (zh) | 一种条带式煤炭地下气化系统及生产方法 | |
CN110159245A (zh) | 分布式注排气通道窄条带煤炭地下气化炉生产系统及方法 | |
CN104632177B (zh) | 一种无井式煤炭地下气化系统及工艺 | |
US20140000878A1 (en) | Method for shortening an injection pipe for underground coal gasification | |
CN106150471B (zh) | 用于煤炭地下气化工艺的对接式气化炉与操作方法 | |
CN113914846A (zh) | 一种应用双羽状水平井改善煤炭地下气化气腔发育的方法 | |
CN104314549B (zh) | 煤层地下气化方法 | |
Miller et al. | Proposed air injection recovery of cold-produced heavy oil reservoirs | |
CN104712305B (zh) | 一种地下气化炉及气化方法 | |
CN104594873A (zh) | 煤炭地下气化炉及气化方法 | |
CN109707356B (zh) | 一种油页岩原位开采井下点火加热装置及加热方法 | |
US20140000873A1 (en) | Sacrificial liner linkages for auto-shortening an injection pipe for underground coal gasification | |
RU2383728C1 (ru) | Способ подземной газификации | |
CN205990906U (zh) | 用于煤炭地下气化工艺的对接式气化炉 | |
CN206053927U (zh) | 用于煤炭地下气化过程的氧化剂注入设备 | |
CN208669290U (zh) | 由多层u型对接井组构成的煤炭地下气化通道 | |
CN114382444A (zh) | 一种联合co2气体埋存的天然气水合物开采系统及方法 | |
CN106437673B (zh) | 用于煤炭地下气化工艺的线性气化炉与操作方法 | |
CN115773098A (zh) | 煤层和油层叠合区地下煤制气与提高油层采收率的联合开采方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 14818691 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 14898489 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2014818691 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: 2014303165 Country of ref document: AU Date of ref document: 20140327 Kind code of ref document: A |