CN102080529A - Coal bed gas cave thermal well completion method - Google Patents
Coal bed gas cave thermal well completion method Download PDFInfo
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- CN102080529A CN102080529A CN2010105933454A CN201010593345A CN102080529A CN 102080529 A CN102080529 A CN 102080529A CN 2010105933454 A CN2010105933454 A CN 2010105933454A CN 201010593345 A CN201010593345 A CN 201010593345A CN 102080529 A CN102080529 A CN 102080529A
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Abstract
The invention belongs to the field of coal bed gas exploration and development, and particularly relates to a coal bed gas cave thermal well completion method which is implemented according to the following steps: (1) performing high-temperature-resistant cement casing cementing on the top of the coal seam; (2) after drilling to 50-80 meters below the coal seam, performing hole expanding and well completion on the coal seam section; (3) removing coal dust in a shaft; (4) a thermal well completion combined pipe column is put into the middle of the cave; (5) injecting silane and oxygen, starting combustion at the cave part, and heating the coal bed; (6) when the temperature is higher than 600 ℃, determining whether to stop supplying silane according to the component detection result of the flow-back gas; (7) when the temperature increased to 1500 ℃, the oxygen supply was stopped. The invention completes the well in the cave under the thermal condition, the coal bed around the shaft is stable, is not easy to collapse, is easy to ignite and control, and can be used for blind hole type coal underground gasification.
Description
Technical field
The invention belongs to the cbm exploration development field, relate in particular to a kind of coal bed gas cave heating power completion method.
Background technology
The cave completion is a kind of main coal bed gas completion technique, PetroChina Company Limited., middle coal all have test in area, north, Shen and BP in Turfan, initial stage is respond well, but easily caves in owing to exposing the coal seam during row adopts, and causes pit shaft to drag for sand operation frequency height even pit shaft damage.
Summary of the invention
The present invention be intended to overcome the deficiencies in the prior art part and provide a kind of under thermal condition the cave completion, the coal seam is firm around the pit shaft, is difficult for caving in, it is inflammable easy to control to light a fire, and can be used for the coal bed gas cave heating power completion method of blind-hole type underground coal gasification(UCG).
For achieving the above object, the present invention is achieved in that
Coal bed gas cave heating power completion method, can implement as follows:
(1) the high-temperature cement casing cementing is prevented at the top, coal seam;
(2) be drilled into 50～80 meters of coal seam belows after, coal seam section reaming completion;
(3) remove coal dust in the pit shaft;
(4) be lowered to heating power completion combined string to the middle part, cave;
(5) inject silane, oxygen, the position, cave takes fire, the heating coal seam;
(6) after temperature is higher than 600 ℃,, determine whether to stop for silane according to the composition detection result who returns the exhaust body;
(7) when temperature is increased to 1500 ℃, stop oxygen supply.
As a kind of preferred version, in the step of the present invention (1), prevent the high-temperature cement casing cementing for 15～20 meters in the top, coal seam.
As another kind of preferred version, heating power completion combined string comprises metal sleeve, is positioned at high temperature resistant oil pipe, thermal packer, burner within the metal sleeve, is assigned in output gas detection system interface, silane injected system interface and the oxygen injected system interface of well head in the step of the present invention (4); Described thermal packer is fixed between metal sleeve and the high temperature resistant oil pipe; Described burner and well head fixedly connect.
The present invention compared with prior art has following characteristics:
1, the coal seam is firm around the cave completion under the thermal condition, pit shaft, is difficult for caving in.
2, the coal seam permeability uprises around the cave.
3, utilize silane to carry out the ground down-firing, inflammable easy to control, effective.
4, this mode can be used for the blind-hole type underground coal gasification(UCG).
Description of drawings
The invention will be further described below in conjunction with the drawings and specific embodiments.
Fig. 1 is a heating power completion combined string overall structure schematic diagram of the present invention.
Among the figure: 1 is output gas detection system interface; 2 is well head; 3 is silane injected system interface; 4 is oxygen injected system interface; 5 is metal sleeve; 6 is high temperature resistant oil pipe; 7 is thermal packer; 8 are the reaming cave; 9 is burner.
The specific embodiment
Referring to shown in Figure 1, coal bed gas cave heating power completion method, can implement as follows:
(1) the high-temperature cement casing cementing is prevented at the top, coal seam;
(2) be drilled into 50～80 meters of coal seam belows after, coal seam section reaming completion;
(3) remove coal dust in the pit shaft;
(4) be lowered to heating power completion combined string to the middle part, cave;
(5) inject silane, oxygen, the position, cave takes fire, the heating coal seam;
(6) after temperature is higher than 600 ℃,, determine whether to stop for silane according to the composition detection result who returns the exhaust body;
(7) when temperature is increased to 1500 ℃, stop oxygen supply.
In the described step (1), prevent the high-temperature cement casing cementing for 15～20 meters in the top, coal seam.
Heating power completion combined string comprises metal sleeve 5, is positioned at high temperature resistant oil pipe 6, thermal packer 7, burner 9 within the metal sleeve 5, is assigned in output gas detection system interface 1, silane injected system interface 3 and the oxygen injected system interface 4 of well head in the step of the present invention (4); Described thermal packer 7 is fixed between metal sleeve 5 and the high temperature resistant oil pipe 6; Described burner 9 fixedly connects with well head.
Northern certain block in Shenyang, jet coal, moisture less, easily crisp, middle coal, middle oily Liaohe Petroleum Exploration Bureau are all at cave, this area completion pilot production test, the highest 2.0MPa of pressure.The Great Wall probing is in implementing plan cave, this area heating power completion.
1, about 15～20 meters anti-high-temperature cement casing cementings in top, coal seam;
2, be drilled into 50 meters of coal seam belows after, coal seam section reaming completion;
3, remove coal dust in the pit shaft;
4, be lowered to heating power completion combined string (see figure 1) to the middle part, cave;
5, injection silane, oxygen under the certain pressure, the position, cave takes fire, the heating coal seam;
6, the coal seam produces following situation in the process that temperature raises:
Drying stage (110 ℃) mainly evaporates the absorption moisture content on coal surface, needs to absorb a large amount of heat.
Desorption phase (110～250 ℃) discharges the gas CO that adsorbs in the feed coal hole
2, CO, CH
4Deng.Simultaneously also separate out partially crystallizable water, be endothermic process.
In pyrolysis initial stage (250～300 ℃) the organic molecule effects such as deoxidation, desulfurization are at first taken place in heat-labile side-chain radical, generate CO
2, CO, H
2S and steam, organic matter also begin depolymerization, produce a small amount of tar.
Coal acutely decomposes, depolymerization in pyrolysis mid-term (300～600 ℃), separates out a large amount of tar and gas, and tar removes CO mainly in this stage sucking-off in the gas
2, CO, H
2Outside O, the steam, also contain CH
4, C
2H
4, C
2H
8Deng gaseous hydrocarbon, solid residue is a semicoke.Be the endothermic reaction, binding coal is generated the three-phase integrated gel of gas, liquid, solid during this period.Make that the coal grain is softening, fusion, expansion.
7, carry out under the certain pressure condition by ground head valve control burning, detect parameter and composition that oil pipe and silane, oxygen hose annular space return the exhaust body.After temperature is higher than 600 ℃, according to the composition detection result who returns the exhaust body,, prove to reach the coking of top layer, coal seam, prevent to cave in and improve the pit shaft purpose of penetrating power on every side if contain CnHm (n, m＞2) output, at this moment stop for silane.If a large amount of CH4, CO and H2 output are arranged, prove that exposed coal seam begins to take place destructive distillation, generation pyrolytic reaction: coal-CH4+H2+H2O+CO+CO2, even burning: CH4+O2-CO+CO2+H2 realize the coal seam coking and improve the pit shaft purpose of penetrating power on every side.
If 8 temperature continue to raise, prove that the coal seam lights, the generation underground gasification when temperature is increased to 1500 ℃, stops oxygen supply.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. heating power completion method in coal bed gas cave is characterized in that, implements as follows:
(1) the high-temperature cement casing cementing is prevented at the top, coal seam;
(2) be drilled into 50～80 meters of coal seam belows after, coal seam section reaming completion;
(3) remove coal dust in the pit shaft;
(4) be lowered to heating power completion combined string to the middle part, cave;
(5) inject silane, oxygen, the position, cave takes fire, the heating coal seam;
(6) after temperature is higher than 600 ℃,, determine whether to stop for silane according to the composition detection result who returns the exhaust body;
(7) when temperature is increased to 1500 ℃, stop oxygen supply.
2. coal bed gas according to claim 1 cave heating power completion method is characterized in that: in the described step (1), prevent the high-temperature cement casing cementing for 15～20 meters in the top, coal seam.
3. coal bed gas according to claim 2 cave heating power completion method is characterized in that: in the described step (6), if contain CnHm (n, m＞2) output, then stop for silane.
4. coal bed gas according to claim 3 cave heating power completion method is characterized in that: heating power completion combined string comprises metal sleeve (5), is positioned at high temperature resistant oil pipe (6), thermal packer (7), burner (9), the output gas detection system interface (1) that is assigned in well head, silane injected system interface (3) and oxygen injected system interface (4) within the metal sleeve (5) in the described step (4); Described thermal packer (7) is fixed between metal sleeve (5) and the high temperature resistant oil pipe (6); Described burner (9) fixedly connects with well head.
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| CN2010105933454A CN102080529A (en) | 2010-12-17 | 2010-12-17 | Coal bed gas cave thermal well completion method |
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| CN2010105933454A CN102080529A (en) | 2010-12-17 | 2010-12-17 | Coal bed gas cave thermal well completion method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104747143A (en) * | 2013-12-31 | 2015-07-01 | 天津建筑机械厂 | Heavy oil diluting technology for underground combustion methane |
| CN105756591A (en) * | 2014-12-17 | 2016-07-13 | 中国石油天然气股份有限公司 | Coal bed gas well completion method |
| US9428978B2 (en) | 2012-06-28 | 2016-08-30 | Carbon Energy Limited | Method for shortening an injection pipe for underground coal gasification |
| US9435184B2 (en) | 2012-06-28 | 2016-09-06 | Carbon Energy Limited | Sacrificial liner linkages for auto-shortening an injection pipe for underground coal gasification |
| CN107815330A (en) * | 2017-08-11 | 2018-03-20 | 新疆国利衡清洁能源科技有限公司 | Skid-mounted gas fuel ignition device and ignition method thereof |
| CN107842350A (en) * | 2017-11-07 | 2018-03-27 | 河南理工大学 | A kind of method that extraction rate is improved in high gas remainder quantity coal seam of underground coal mine |
| CN110714737A (en) * | 2019-11-09 | 2020-01-21 | 中为(上海)能源技术有限公司 | Well cementation system and method for coal underground gasification process |
| CN113863897A (en) * | 2020-06-12 | 2021-12-31 | 中国石油天然气股份有限公司 | Cave well completion method and system |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9428978B2 (en) | 2012-06-28 | 2016-08-30 | Carbon Energy Limited | Method for shortening an injection pipe for underground coal gasification |
| US9435184B2 (en) | 2012-06-28 | 2016-09-06 | Carbon Energy Limited | Sacrificial liner linkages for auto-shortening an injection pipe for underground coal gasification |
| US9963949B2 (en) | 2012-06-28 | 2018-05-08 | Carbon Energy Limited | Sacrificial liner linkages for auto-shortening an injection pipe for underground coal gasification |
| US9976403B2 (en) | 2012-06-28 | 2018-05-22 | Carbon Energy Limited | Method for shortening an injection pipe for underground coal gasification |
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| CN105756591A (en) * | 2014-12-17 | 2016-07-13 | 中国石油天然气股份有限公司 | Coal bed gas well completion method |
| CN107815330A (en) * | 2017-08-11 | 2018-03-20 | 新疆国利衡清洁能源科技有限公司 | Skid-mounted gas fuel ignition device and ignition method thereof |
| CN107842350A (en) * | 2017-11-07 | 2018-03-27 | 河南理工大学 | A kind of method that extraction rate is improved in high gas remainder quantity coal seam of underground coal mine |
| CN107842350B (en) * | 2017-11-07 | 2019-08-02 | 河南理工大学 | A kind of method that extraction rate is improved in the high gas remainder quantity coal seam of underground coal mine |
| CN110714737A (en) * | 2019-11-09 | 2020-01-21 | 中为(上海)能源技术有限公司 | Well cementation system and method for coal underground gasification process |
| CN110714737B (en) * | 2019-11-09 | 2023-06-20 | 中为(上海)能源技术有限公司 | Well cementation system and method for underground coal gasification process |
| CN113863897A (en) * | 2020-06-12 | 2021-12-31 | 中国石油天然气股份有限公司 | Cave well completion method and system |
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Application publication date: 20110601 |