CN102913222A - Oxidation process completion method of horizontal well for developing coalbed methane - Google Patents
Oxidation process completion method of horizontal well for developing coalbed methane Download PDFInfo
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- CN102913222A CN102913222A CN2012104719306A CN201210471930A CN102913222A CN 102913222 A CN102913222 A CN 102913222A CN 2012104719306 A CN2012104719306 A CN 2012104719306A CN 201210471930 A CN201210471930 A CN 201210471930A CN 102913222 A CN102913222 A CN 102913222A
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Abstract
The invention discloses a completion method of a horizontal well for developing coalbed methane. The invention relates to a completion method for improving the coalbed permeability of a horizontal well (a common horizontal well and a multi-branch horizontal well), and in particular relates to the field of the development of coalbed methane. The method comprises the following steps of: drilling the horizontal well, charging a screen pipe under a horizontal well section, and discharging a liquid in a well. After the liquid is discharged, a heater is put in the horizontal section from a well opening, and a gaseous oxidizing agent (or oxygen-enriched air or oxygen) is injected, so that the oxygen and the coalbed components react with each other. The injection quantity of the gaseous oxidizing agent is set according to metering requirements. According to the completion method, the well track of the horizontal well is enlarged, and the hole-shrinkage change happens to the coalbed of a well wall, so that the permeability can be improved. The heater is started, so that the reaction speed of the coalbed can be accelerated. In the stage of coalbed methane exploiting, if the yield is insufficient, the inert gas or the natural gas can be repeatedly injected; and the secondary seam-generating transformation can be carried out on the coalbed in the manner of repeated pressure keeping and sudden pressure releasing, so that the permeability of the coalbed can be improved, and the yield of the coalbed methane can be further improved.
Description
Technical field
The invention belongs to the cbm development field, is a kind of for adopting horizontal well (comprising simple horizontal well and multi-branched horizontal well) development plan to carry out the horizontal well completion method of coal-bed gas exploitation.
Background technology
In recent years, adopt the horizontal well development scheme to carry out cbm development and obtained increasing application, its distinguishing feature is generally to obtain the higher gas production of more general straight well exploitation and higher recovery ratio, obtains preferably economic benefit.
After the horizontal well work of creeping into is finished, generally adopt at present barefoot completion or sieve tube completion technique (multilateral well is lowered to screen casing in main borehole), also there is pair horizontal well horizontal segment coal seam to adopt the technological experiment of staged fracturing completion, but owing to poor effect does not have as a kind of generally well-completing process of application.
Adopt the horizontal well development scheme to carry out coal-bed gas exploitation, the General Requirements coal seam has certain primary permeability (general real permeability is greater than 0.1～0.2 millidarcy), in order to reduce drilling process to the pollution of coal bed gas and to guarantee the well track quality, horizontal segment creep into general employing under balance pressure drilling technique, adopt simultaneously faster rate of penetration and to the less drilling fluid system of coal seam injury.
At present for original permeability lower (being generally less than 0.1 millidarcy) although and have higher permeability but in drilling process very easily contaminated coal seam, carry out cbm development and also achieve no breakthrough, have so a considerable amount of coal bed gas resources effectively to employ.
Summary of the invention
The purpose of this invention is to provide a kind of completion method that can improve coal seam permeability around the cbm development horizontal well borehole wall, solve because the coal seam original permeability is crossed low and the problem that causes permeability reduction and can't carry out the exploitation of coal bed gas economy is easily polluted at drilling process in the coal seam.
For achieving the above object, the present invention by the following technical solutions:
1, horizontal well creeps into after engineering finishes, and utilizes the reaction of borehole wall coal seam and oxygen to enlarge hole diameter, because the unstability in borehole wall coal seam, the distortion of contracting wall occurs the borehole wall, causes the coal seam to form crackle, the permeability in raising coal seam.
2. reaction speed and the intensity in order to improve borehole wall coal seam and oxygen heats the net horizontal section coal seam.
3. for further winding level section coal seam permeability, inert gas injecting or natural gas, the technology mode that employing builds the pressure repeatedly and suddenly pressure release is agitated.
Description of drawings
For the technical scheme in the clearer explanation embodiment of the invention and the correlation technique, the present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the horizontal well sieve tube completion that is lowered to screen casing;
Fig. 2 is the U-shaped well sieve tube completion that is lowered to screen casing;
Fig. 3 is U-shaped well barefoot completion;
Fig. 4 is the multi-branched horizontal well sieve tube completion;
Fig. 5 is that inflation builds the pressure, shakes and make the seam design sketch.
Among the figure, 1-heater, 2-screen casing.
The specific embodiment
Process implementing process of the present invention is after the horizontal well finishing drilling, to be lowered to screen casing (multi-branched horizontal well is lowered to screen casing in main borehole, with reference to figure 4) at the horizontal well horizontal segment, shown in Fig. 1 and 2,3.Then discharge liquid in the well.After discharge opeing finishes, successively by well head to net horizontal section screen insertion heater, and thermometric, pressure measurement and component testing equipment and wellhead equipment in the pit shaft are installed, as shown in Figure 2.
After the said equipment installs, inject oxidant air (or oxygen-enriched air or oxygen) by well head, the coal component generation oxidation reaction of the oxygen of the oxidant of injection and borehole wall periphery, this moment, whole borehole systems was in air-tight state.
In order to add the speed of fast response, can start donwhole heater heating borehole wall ature of coal, but the heating maximum temperature generally is no more than the burning-point of coal, controls heating-up temperature by temperature measurer.It is mild that the injection of oxidant is wanted, and after the fracture pressure of injection pressure near the stratum of oxidant, namely suspends and inject.When having obvious reduction or oxygen concentration obviously to reduce (when generally reducing by more than 50), wellbore pressure begins again to inject oxidant.The injection rate of oxygen will guarantee that the thickness of borehole wall coal seam generation oxidation reaction reaches enough (generally more than 25cm), and calculates setting according to the physicochemical property of well structure and coal.
After the notes oxygen amount of setting is all injected and is finished reaction, oneself finishes the main program of this technique, can change the coal bed gas pre-production phase over to subsequently, if this moment, output can not reach the index of design, can be by inert gas injecting (nitrogen or carbon dioxide) or natural gas build the pressure repeatedly, then the mode of suddenly pressure release way that the coal seam is agitated is made seam transformation to the coal seam secondary, thereby the permeability that improves the coal seam improves the output (with reference to figure 5) of coal bed gas.
Claims (4)
1. the oxidizing process completion method of a cbm development horizontal well is characterized in that:
The well coal seam permeability of improving the standard to the horizontal well after the finishing drilling, injects gaseous oxidizer, impel oxygen and coal seam to react, enlarge well track, utilize the unstability in borehole wall coal seam, cause the borehole wall that the distortion of contracting wall occurs, thereby make the coal seam form crackle, improve the permeability in coal seam; In the runin mining coal seam gas stage, for further winding level section coal seam permeability, by inert gas injecting or natural gas, the technology mode that employing builds the pressure repeatedly and suddenly pressure release is agitated improves coal seam permeability; Easily the coal seam is polluted and the well that causes producing for drilling process, the permeability that improves the coal seam by oxidizing process improves output, thereby the well that originally can't produce is re-used.
2. the oxidizing process completion method of cbm development horizontal well according to claim 1 is characterized in that, described method also comprises:
Horizontal well after the finishing drilling is lowered to screen casing, discharges liquid in the well; After the discharge opeing, be lowered to heater by well head, and thermometric in the pit shaft, pressure measurement and component testing equipment and wellhead equipment are installed; After equipment is installed, inject oxidant gas or oxygen-enriched air or oxygen by well head.
3. the oxidizing process completion method of cbm development horizontal well according to claim 1 is characterized in that, described method also comprises:
Horizontal well creeps into after engineering finishes, and utilizes the reaction of borehole wall coal seam and oxygen to enlarge hole diameter, and the unstability in borehole wall coal seam can cause the borehole wall can the distortion of contracting wall and make the coal seam form crackle, improves the permeability in coal seam with this; Utilize the heater heating borehole wall, and by temperature measurer control heating-up temperature, accelerate reaction speed and the intensity in oxygen and borehole wall coal seam.
4. the oxidizing process completion method of cbm development horizontal well according to claim 1 is characterized in that, described method also comprises:
Oxidant air Injection total amount will guarantee that the thickness of coal seam generation oxidation reaction is enough, calculates according to the physicochemical property of well structure and coal and sets, and determine the response parameter of this well section by pilot production.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012104719306A CN102913222A (en) | 2012-11-20 | 2012-11-20 | Oxidation process completion method of horizontal well for developing coalbed methane |
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| CN2012104719306A CN102913222A (en) | 2012-11-20 | 2012-11-20 | Oxidation process completion method of horizontal well for developing coalbed methane |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110500069A (en) * | 2019-08-02 | 2019-11-26 | 中国矿业大学(北京) | Anisotropy heterogeneous reservoir coal-bed gas exploitation completion technique selection method |
| CN110972485A (en) * | 2017-03-23 | 2020-04-07 | 北京捷茂迪华能源技术有限公司 | Method for increasing production of coal bed gas by injecting high-temperature air |
| CN111022021A (en) * | 2020-01-02 | 2020-04-17 | 吉林大学 | Oil shale in-situ heating method for coping with thermal expansion characteristics of oil shale formation |
| CN111980642A (en) * | 2020-09-01 | 2020-11-24 | 中联煤层气有限责任公司 | Construction method of coal bed gas multi-branch horizontal well and multi-branch horizontal well |
| CN112727405A (en) * | 2021-01-20 | 2021-04-30 | 王柱军 | Mining method for improving coal bed permeability of coal bed gas development well |
| CN112761585A (en) * | 2021-01-20 | 2021-05-07 | 王柱军 | Process method for improving yield of coal-bed gas well |
| CN112761613A (en) * | 2021-01-20 | 2021-05-07 | 王柱军 | Deep coal in-situ pyrolysis mining and utilizing process |
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| US3848672A (en) * | 1973-05-21 | 1974-11-19 | A Bodine | Sonic retorting technique for in situ minining of carbonaceous material |
| CN1216337A (en) * | 1997-10-16 | 1999-05-12 | 瓦斯塔资源有限公司 | Chemically induced stimulations of subterranean carbonaceous formations with gaseous oxidants |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110972485A (en) * | 2017-03-23 | 2020-04-07 | 北京捷茂迪华能源技术有限公司 | Method for increasing production of coal bed gas by injecting high-temperature air |
| CN110500069A (en) * | 2019-08-02 | 2019-11-26 | 中国矿业大学(北京) | Anisotropy heterogeneous reservoir coal-bed gas exploitation completion technique selection method |
| CN110500069B (en) * | 2019-08-02 | 2022-05-17 | 中国矿业大学(北京) | Selection method of anisotropic heterogeneous reservoir coalbed methane exploitation well completion technology |
| CN111022021A (en) * | 2020-01-02 | 2020-04-17 | 吉林大学 | Oil shale in-situ heating method for coping with thermal expansion characteristics of oil shale formation |
| CN111980642A (en) * | 2020-09-01 | 2020-11-24 | 中联煤层气有限责任公司 | Construction method of coal bed gas multi-branch horizontal well and multi-branch horizontal well |
| CN111980642B (en) * | 2020-09-01 | 2022-04-12 | 中联煤层气有限责任公司 | Construction method of coal bed gas multi-branch horizontal well and multi-branch horizontal well |
| CN112727405A (en) * | 2021-01-20 | 2021-04-30 | 王柱军 | Mining method for improving coal bed permeability of coal bed gas development well |
| CN112761585A (en) * | 2021-01-20 | 2021-05-07 | 王柱军 | Process method for improving yield of coal-bed gas well |
| CN112761613A (en) * | 2021-01-20 | 2021-05-07 | 王柱军 | Deep coal in-situ pyrolysis mining and utilizing process |
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Application publication date: 20130206 |