CN1904308A - Blasting type cave well completion technological method of coal layer gas well - Google Patents
Blasting type cave well completion technological method of coal layer gas well Download PDFInfo
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- CN1904308A CN1904308A CN 200610047360 CN200610047360A CN1904308A CN 1904308 A CN1904308 A CN 1904308A CN 200610047360 CN200610047360 CN 200610047360 CN 200610047360 A CN200610047360 A CN 200610047360A CN 1904308 A CN1904308 A CN 1904308A
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Abstract
This invention discloses to a kind of the coal seam gas well blasting cave completion method, which is used for coal seam gas exploration and development, this method includes three parts that blasting and forming the cave, detecting cave form, fetching the leftover, its practice steps are: preparing the data, material ,making working risk reducing measure, the cave being under construction preparing, exploding to form cave is under construction , fetching the leftover, continue exploding to form cave in the situation that the pitshaft is unimpeded, The constructions is repeat many times such as exploding a cave , testing , fetching the leftover, till it reach the design demand. This kind of completion method make cave scale controllable, the speed is quick ,it has notable sewing function, the period of cave construction is shorter by making use of this kind of method, the cost reduces greatly, it can improve the output and recovery rate of each well , ensuring the overall effect of the coal seam gas exploration.
Description
Technical field:
The present invention relates to a kind of completion technique that is used for the cbm exploration exploitation.
Background technology:
Along with the serious imbalance that domestic and international oil, gas production and reserve-production ratio increase, the petroleum-based energy crisis aggravates day by day.In recent years, constantly strengthen as the work of exploration and development of the coal bed gas of one of oil gas alternate resources.Coal bed gas well adopts bore hole cave technology completion usually, that is behind barefoot completion, artificially at position, bore hole section coal seam, by instrument reaming hole mode or negative pressure mode, form a stable coal seam cavern, eliminate the coal seam formation damage that to have taken place simultaneously and form very that large tracts of land contains a large amount of unload zones of opening the property cracks in wellbore, improve the permeability in wellbore hugger crack, increase the flow conductivity on stratum, make and realize between well and the stratum that natural crack effectively is communicated with and reaches the purpose of volume increase.At present, according to different with the method for intrinsic fracture connection employing, coal bed gas well bore hole cave completion mode mainly is divided into three types both at home and abroad: first type is dynamic injection/discharging.Dynamically injection/discharge process can fully clean reservoir, produces new crack, and enlarges existing crack, improves the connectedness of reservoir and pit shaft.According to domestic experience, the dynamic injection/emissions operation process of a typical intact generally needs 10 ~ 15 days, implements 20 ~ 30 times and injects operation.Second type is Dynamic Emission.Close surface valve, make ground pressure be increased to predetermined value (be generally 5 ~ 7MPa, be lower than reservoir pressure).The time length of closing depends on reservoir pressure and permeability, when reaching required pressure, and Open valve open flow rapidly, extraction gas, water, coal and landwaste.Owing to do not inject the stage, so the Dynamic Emission process is insufficient to the cleaning of reservoir.Once common Dynamic Emission operating process generally needs about 12 days, implements work cycle more than 6.The third type is dynamic water static(al) negative pressure circulation.Do circulatory mediator with compressed air or aerated water and clean the coal seam, make bottom pressure be lower than reservoir pressure, the coal seam is subjected to negative pressure to produce shear crack.In the process of coal seam well section reciprocation cycle, the ickings that drops in pit shaft is circulated to ground.After confirming that the cave operation of negative pressure round-robin method is finished, carry out the foam well-flushing, from making the cave to this end, whole process was generally lasted about 10 days.
In sum, existing three kinds of coal bed gas bore hole cave completion mode exist make cave duty cycle long, expense is high, pollute big and there are shortcomings such as unsafe factor in the ground high-pressure section to the coal seam infringement.
Summary of the invention:
The object of the invention is to provide a kind of can the minimizing to invade pollution, protection coal seam and can shorten the blasting type cave well completion technological method of coal layer gas well of making the cave cycle greatly.
The object of the present invention is achieved like this.This kind process method for well completion comprises that cave explosion shaping, cave form detect, drag for the bits three parts, and the process technical essential of each several part is as follows:
1, the cave explosion is shaped: comprise that explosive is selected, the powder column consumption is determined, powder column moulding, powder column connection, transmission means, powder column location, the school is dark and detonate.
1. explosive is selected, and makes the concrete geology characteristic of the theoretical He Mei district's coal bed gas well in cave according to explosion, selects the liquid or solid explosive;
2. the powder column consumption is determined, according to hole diameter and coal seam thickness design, powder stick diameter and grain length calculate blast charging amount for the first time, and the explosive payload of reaming for the second time is generally primary twice, and the rest may be inferred, till meeting the requirements of the cave;
3. compact structure is adopted in powder column moulding, charge constitution, avoids being interrupted or coupling charging not, to help increasing compression diameter; Powder stick adopts the compression moulding post, with help transporting, go into the well, operation such as installation, and can improve the loading density of explosive; When powder column press-fited, the centre was Φ 20mm hole, is through on the special pull bar;
4. powder column connected mode, adopt the thin-walled (plastic pipe of δ=1mm) or the rubber skin carries out integral coating to detonating fuse and explosive column, play the effect of waterproof, antifriction, powder column location, middle iron staff (diameter phi 3mm～φ 12mm) plays load capacity, is connected with locator and constitutes the wire loop effect; Select the locator of external diameter φ 40mm for use, the top connects the hard electrode of 0.45m, the top connects cable head again, the bottom is threaded with the center iron staff, an igniting/sense line is drawn on the next door, and this line is divided into two the end of a thread, and one is passed through an electric capacity and is connected with detonator, another is connected with center conductor, is connected to the sensor that is hampered that install the explosive column bottom always; Consider that from the security standpoint of instrument it is more suitable generally to get distance of zero mark LO=5m.The connection of lubricator, 0.45m electrode system, locator, sensor igniting lower contact prolongation cable is finished on ground;
5. the powder column transmission means can adopt cable transmission or tubing transmission, adopts cable transmission usually mostly.When oil pipe is carried powder column, can consider to add packer at oil pipe place, initiator upper end, adjust back seat envelope earlier, caber detonates again, can reduce the destruction of brisance to the well head direction like this.During lift pipe string, the packer of selecting for use should have the good sealing property of separating;
6. explosive localization method, explosive adopt with locator and are connected firmly, can accurately know the depth location of explosive by survey magnetic locator curve, and dark with 0.45 electrode gradient curve and its school;
7. detonation mode, initiation system adopt Magnedat or caber to ignite powder column.
2, the cave form detects: adopt detection cave forms such as acoustic amplitude logging.
3, drag for bits: dragging for the bits method has cable to drag for the circulation of bits, dynamic foam liquid, clean to add under ickings, drilling rod or the oil pipe and drag for that the bits tube drags for bits and part is dragged for bits, it is multiple that part pushes away down residual shaft bottom etc., adopts usually that circulation debris removal of drilling tool reaming and dipper machinery drag for bits, the ground coal that opens a hole is considered to be worth doing.
The implementation step of this kind process method for well completion is as follows:
1, data is prepared: collect the well-log information of the various necessity of admission, the each side situation of detail knowledge construction well is made the dark mode in advice note design charge explosion school, cave according to explosion, finishes explosion and makes the cave design;
2, material is prepared: comprise 1. grain configuration design and processing; 2. explosive adheres to the processing of rod; 3. the processing of the special-purpose lubricator of well head; 4. explosive and downhole instrument connect the processing of material; 5. prepare waterproof electromagnetic detonators, the waterproof detonating fuse of some and level of security;
3, formulate construction risk and subdue measure, comprise pit shaft and well site methane explosion prevention, work progress blowout prevention, construction sequence standardization etc., guarantee the construction overall process safety and environmental protection;
4, preparation of construction: 1. top sheave, lower sheave, locator and cable are installed on request; 2. there is power supply in the closed-in well place; 3. ground connects locator and powder column, accurately measures the igniting distance of zero mark; 4. the well head degree of depth is to zero;
5, the worker that spreads manuer in holes is made in explosion: 1. routinely the perforation construction requirement to finish measurement, location, school dark; 2. with predetermined length of shot position, powder column centrally aligned coal seam, explosion is implemented in the electromagnetic detonators igniting;
6, drag for bits: must drag for bits after each coal seam explosion, which kind of decision adopts drag for the bits mode according to actual conditions, and preferred manner is that circulation debris removal of drilling tool reaming and dipper machinery drag for bits;
7, under pit shaft keeps unimpeded situation, carry out follow-up explosion and make the worker that spreads manuer in holes;
8, explosion is made the cave, is tested, drags for constructions such as bits and carry out repeatedly repeatedly, till reaching designing requirement.
Blasting type cave well completion technological method of coal layer gas well provided by the invention makes that the cave scale is controlled, and speed is fast, and has and make joint function significantly, utilize this kind process to make the cave short construction period, cost reduces greatly, helps improving well yield and recovery ratio, guarantees the coal-bed gas exploitation whole structure.
Description of drawings:
Fig. 1 is a blasting type cave well-completing process principle schematic of the present invention.Fig. 2 is explosive moulding and connected mode schematic diagram.
The specific embodiment:
The present invention is provided by following examples, below in conjunction with accompanying drawing the present invention is further described.
As shown in Figure 1, in the completion work progress of the present invention, adopt logging winch 1, hook 2 that cable 6 is passed through well head lubricator 3, production tree 4 and preventer 5 G.I.Hs; Downhole cable 6 is connected with 0.45 electrode system 7 and locator 8, and the lower end is connected with the explosion powder column 9 and the sensor 10 that is hampered.Among Fig. 1, label " 11 " is the coal bed gas well cement sheath, and " 12 " are short sleeve, and " 13 " are casing shoe, and " 14 " are the bore hole tube, and " 15 " are the coal seam, and " 16 " are the shaft bottom.Fig. 2 is Fig. 1 down-hole part enlarged drawing, shows the shape and the connected mode of cable 6,0.45 electrode system 7, locator 8, explosion powder column 9 and the sensor 10 that is hampered, and provides the position of igniting distance of zero mark Lo survey mark.
Claims (2)
1, a kind of blasting type cave well completion technological method of coal layer gas well is characterized in that: this process comprises that cave explosion shaping, cave form detect, drag for the bits three parts, and the process technical essential of each several part is as follows:
(1), the cave explosion is shaped: comprise that explosive is selected, the powder column consumption is determined, powder column moulding, powder column connection, transmission means, powder column location, the school is dark and detonate:
1. explosive is selected, and makes the concrete geology characteristic of the theoretical He Mei district's coal bed gas well in cave according to explosion, selects the liquid or solid explosive;
2. the powder column consumption is determined, according to hole diameter and coal seam thickness designer drug coil diameter and grain length, calculates blast charging amount for the first time, and the explosive payload of reaming for the second time is generally primary twice, and the rest may be inferred, till meeting the requirements of the cave;
3. compact structure is adopted in powder column moulding, charge constitution, avoids being interrupted or coupling charging not, to help increasing compression diameter; Powder stick adopts the compression moulding post, with help transporting, go into the well, operation such as installation, and can improve the loading density of explosive; When powder column press-fited, the centre was Φ 20mm hole, is through on the special pull bar;
4. powder column connected mode adopts the thin-walled plastic pipe or the rubber skin carries out integral coating to detonating fuse and explosive column, plays the effect of waterproof, antifriction, powder column location, and middle iron staff plays load capacity, is connected with locator and constitutes the wire loop effect; Select the locator of external diameter φ 40mm for use, the top connects the hard electrode of 0.45m, the top connects cable head again, the bottom is threaded with the center iron staff, an igniting/sense line is drawn on the next door, and this line is divided into two the end of a thread, and one is passed through an electric capacity and is connected with detonator, another is connected with center conductor, is connected to the sensor that is hampered that install the explosive column bottom always; Consider from the security standpoint of instrument, generally get distance of zero mark LO=5m, the connection of lubricator, 0.45m electrode system, locator, sensor igniting lower contact prolongation cable is finished on ground;
5. the powder column transmission means can adopt cable transmission or tubing transmission, adopts cable transmission usually mostly; When oil pipe is carried powder column, can consider to add packer at oil pipe place, initiator upper end, adjust back seat envelope earlier, caber detonates again, can reduce the destruction of brisance to the well head direction like this, and during lift pipe string, the packer of selecting for use should have the good sealing property of separating;
6. explosive localization method, explosive adopt with locator and are connected firmly, can accurately know the depth location of explosive by survey magnetic locator curve, and dark with 0.45 electrode gradient curve and its school;
7. detonation mode, initiation system adopt Magnedat or caber to ignite powder column;
(2), the cave form detects: adopt detection cave forms such as acoustic amplitude logging;
(3), drag for bits: dragging for the bits method has cable to drag for the circulation of bits, dynamic foam liquid, clean to add under ickings, drilling rod or the oil pipe and drag for that the bits tube drags for bits and part is dragged for bits, it is multiple that part pushes away down residual shaft bottom etc., adopts usually that circulation debris removal of drilling tool reaming and dipper machinery drag for bits, the ground coal that opens a hole is considered to be worth doing.
2, blasting type cave well completion technological method of coal layer gas well according to claim 1 is characterized in that: the implementation step of this process is as follows:
(1), data is prepared: collect the well-log information of the various necessity of admission, the each side situation of detail knowledge construction well is made the dark mode in advice note design charge explosion school, cave according to explosion, finishes explosion and makes the cave design;
(2), material is prepared: comprise 1. grain configuration design and processing; 2. explosive adheres to the processing of rod; 3. the processing of the special-purpose lubricator of well head; 4. explosive and downhole instrument connect the processing of material; 5. prepare waterproof electromagnetic detonators, the waterproof detonating fuse of some and level of security;
(3), formulate construction risk and subdue measure, comprise pit shaft and well site methane explosion prevention, work progress blowout prevention, construction sequence standardization etc., assurance construction overall process safety and environmental protection;
(4), preparation of construction: 1. top sheave, lower sheave, locator and cable are installed on request; 2. there is power supply in the closed-in well place; 3. ground connects locator and powder column, accurately measures the igniting distance of zero mark; 4. the well head degree of depth is to zero;
(5), the worker that spreads manuer in holes is made in explosion: 1. the perforation construction requirement is finished measurement routinely, the school, location is dark; 2. with predetermined length of shot position, powder column centrally aligned coal seam, explosion is implemented in the electromagnetic detonators igniting;
(6), drag for bits: must drag for bits after each coal seam explosion, which kind of decision adopts drag for the bits mode according to actual conditions, and preferred manner is that circulation debris removal of drilling tool reaming and dipper machinery drag for bits;
(7), under pit shaft keeps unimpeded situation, carry out follow-up explosion and make the worker that spreads manuer in holes;
(8), explosion makes the cave, test, drag for constructions such as bits carries out repeatedly repeatedly, till reaching designing requirement.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102080529A (en) * | 2010-12-17 | 2011-06-01 | 中国石油集团长城钻探工程有限公司 | Coal bed gas cave thermal well completion method |
| CN102155174A (en) * | 2011-03-10 | 2011-08-17 | 贵州铸安矿山科技股份有限公司 | Drilling foam slag discharging method |
| CN101586469B (en) * | 2009-07-07 | 2011-10-12 | 天地科技股份有限公司 | Hole sealing method for deep hole advanced loose blasting |
| CN102220853A (en) * | 2010-04-13 | 2011-10-19 | 河南长江石油机械有限公司 | Asymmetrically operated non-beam coal bed gas sampling method and device |
| CN102373919A (en) * | 2010-08-27 | 2012-03-14 | 中国石油大学(北京) | Experimental apparatus for evaluating coalbed methane cave well completion |
| CN102646360A (en) * | 2012-02-28 | 2012-08-22 | 吉林大学 | Logging process experiment teaching demonstration device and demonstration method |
| CN103061734A (en) * | 2013-01-06 | 2013-04-24 | 河南理工大学 | Method for chemically making cave of open hole of gas well of coal seam |
| CN108471667A (en) * | 2012-07-27 | 2018-08-31 | 诺瓦斯能源集团有限公司 | For using plasma source excitation well, deposit and the system and method for drilling |
| CN108979707A (en) * | 2018-08-15 | 2018-12-11 | 河南铁福来装备制造股份有限公司 | A method of cave gas control is made suitable for coal mine Di Chou lane directional drilling |
| 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 |
| CN113883977A (en) * | 2019-12-10 | 2022-01-04 | 四川中鼎爆破工程有限公司 | Hole detection device and measurement method in blasting construction |
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| US5540282A (en) * | 1994-10-21 | 1996-07-30 | Dallas; L. Murray | Apparatus and method for completing/recompleting production wells |
| US6109832A (en) * | 1998-04-02 | 2000-08-29 | Lincoln; David A. | Ram burster and method for installing tubular casing underground |
| US6561269B1 (en) * | 1999-04-30 | 2003-05-13 | The Regents Of The University Of California | Canister, sealing method and composition for sealing a borehole |
| CN1324979A (en) * | 1999-12-17 | 2001-12-05 | 中国科学院力学研究所 | Explosion treating method for oil layer in oil field |
| CN1434191A (en) * | 2002-01-25 | 2003-08-06 | 中国人民解放军工程兵第四十一旅 | Bore construction method by bore explosion |
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- 2006-07-28 CN CNB2006100473602A patent/CN100434653C/en not_active Expired - Fee Related
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| CN101586469B (en) * | 2009-07-07 | 2011-10-12 | 天地科技股份有限公司 | Hole sealing method for deep hole advanced loose blasting |
| CN102220853A (en) * | 2010-04-13 | 2011-10-19 | 河南长江石油机械有限公司 | Asymmetrically operated non-beam coal bed gas sampling method and device |
| CN102373919A (en) * | 2010-08-27 | 2012-03-14 | 中国石油大学(北京) | Experimental apparatus for evaluating coalbed methane cave well completion |
| CN102373919B (en) * | 2010-08-27 | 2014-03-26 | 中国石油大学(北京) | Experimental apparatus for evaluating coalbed methane cave well completion |
| CN102080529A (en) * | 2010-12-17 | 2011-06-01 | 中国石油集团长城钻探工程有限公司 | Coal bed gas cave thermal well completion method |
| CN102155174A (en) * | 2011-03-10 | 2011-08-17 | 贵州铸安矿山科技股份有限公司 | Drilling foam slag discharging method |
| CN102646360A (en) * | 2012-02-28 | 2012-08-22 | 吉林大学 | Logging process experiment teaching demonstration device and demonstration method |
| CN108471667A (en) * | 2012-07-27 | 2018-08-31 | 诺瓦斯能源集团有限公司 | For using plasma source excitation well, deposit and the system and method for drilling |
| CN103061734A (en) * | 2013-01-06 | 2013-04-24 | 河南理工大学 | Method for chemically making cave of open hole of gas well of coal seam |
| CN108979707A (en) * | 2018-08-15 | 2018-12-11 | 河南铁福来装备制造股份有限公司 | A method of cave gas control is made suitable for coal mine Di Chou lane directional drilling |
| CN113883977A (en) * | 2019-12-10 | 2022-01-04 | 四川中鼎爆破工程有限公司 | Hole detection device and measurement method in blasting construction |
| CN113883977B (en) * | 2019-12-10 | 2023-03-21 | 四川中鼎爆破工程有限公司 | Hole detection device and measurement method in blasting construction |
| 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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