CN101922285A - Method for safely tripping gas drilling tool in case of encountering air layer - Google Patents
Method for safely tripping gas drilling tool in case of encountering air layer Download PDFInfo
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- CN101922285A CN101922285A CN2009100602185A CN200910060218A CN101922285A CN 101922285 A CN101922285 A CN 101922285A CN 2009100602185 A CN2009100602185 A CN 2009100602185A CN 200910060218 A CN200910060218 A CN 200910060218A CN 101922285 A CN101922285 A CN 101922285A
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Abstract
The invention discloses a method for safely tripping a gas drilling tool in case of encountering an air layer and belongs to the technical field of tripping in gas drilling. The method comprises the following four steps of: arranging a jet orifice on a sand drain pipeline; circulating a well bore by using nitrogen before tripping; injecting nitrogen into a sand drain pipe and detecting combustible gases on a drilling platform. The invention provides a method for safely tripping of a gas drilling tool encountering an air layer based on the technology of fluid mechanics, which solves the problems that a drill collar passes through a rubber core and the rubber core is scraped off into the bottom of the well. By the method, negative pressure effect can be generated on the sand drain pipeline, the combustible gases overflowing are taken out of the well bottom for exhaustion and combustion and in case of encountering the air layer, the tripping safety is guaranteed.
Description
Technical field: a kind of method of safely tripping gas drilling tool in case of encountering air layer, when being used for the oilfield drilling engineering and utilizing gas to implement to creep into engineering, bore and meet gas production and be no more than 13000m as circulatory mediator
3Making a trip of the gas-bearing bed of/d belongs to the technology field that makes a trip in the gas drilling.
Background technology:
At present, gas drilling become and significantly improved rate of penetration, find and protection oil-gas Layer, the important technical of administering pernicious leakage, reduction drilling cost, in order to accelerate the development rate of oil gas field, in the use and drilling engineering that gas drilling is a large amount of, so gas drilling is just flourish with its advantage; In the prior art, adopting the gas under balance pressure drilling is one of method of rapid drilling, in order to guarantee in implementing drilling process, having under the condition of control, implement open flow drilling well on one side on one side, therefore all to use rotating blowout preventer at well head, when boring, gas drilling meets gas-bearing bed, when needs carry out round trip, usually the method that adopts is not remove the rotating blowout preventer assembly, utilize the airtight drilling rod of rotary blowout preventer glue core to carry out round trip, can prevent that like this fuel gas of down-hole from overflowing in pit shaft; But, the glue core maximum diameter of rotating blowout preventer only is 195mm at present, can only allow drilling rod and external diameter to pass through less than the drill collar of 195mm, size is big and use more 203.2mm drill collar and 228.6mm drill collar etc. then can not pass through the glue core, therefore, when using the large-size drill collar, make a trip and to get lower glue core,, just cause well head to open wide in case take off the glue heart of rotating blowout preventer, the fuel gas of down-hole just can overflow well head, causes great potential safety hazard; And in going down process, because drilling tool accelerates by the speed of the glue heart than drilling tool in the drilling process greatly by the speed of the glue heart, so long-time friction glue core may cause the glue core to come off, and the glue heart that comes off is fallen into down-hole accidents such as may causing bit freezing behind the shaft bottom.
Summary of the invention:
The objective of the invention is based on hydrodynamics and fluid numerical simulation technology, provides a kind of method of safely tripping gas drilling tool in case of encountering air layer in order to overcome the problem that round trip exists behind the brill chance gas-bearing formation in the above-mentioned gas drilling process.
The present invention finishes according to following steps:
The first step is provided with the corner of one 90 degree in the middle part of sediment outflow pipeline 7, at angle position the nozzle 6 of a spout towards 7 outlets of sediment outflow pipeline is set, and again the bypass line in the gas supply line 5 is connected to nozzle 6 by No. three ball valves 3;
Second step, elder generation before pulling out of hole or boring down carried out circulation greater than two cycle periods with nitrogen to well, and be 5～10 minutes circulation timei;
The 3rd step closed No. two ball valves 2 and stops gas injection in well after finishing the circulation that second step required, and opened ball valve 3 simultaneously No. three, by gas injection equipment 1 by No. three ball valves 3 and bypass line 5, again by nozzle 6 to sediment outflow pipe 7 nitrogen injections;
The 4th step adopted combustible gas detectors to detect overflowing of fuel gas at rig floor 10, if any overflowing the discharge capacity that then increases nitrogen injection, to not having fuel gas to overflow to rig floor 10, came into effect then and pulled out of hole or brill down.
The middle part of described sediment outflow pipeline 7 is provided with the position of 90 degree corners apart from sediment outflow pipe 7 outlets 20～30m;
The diameter of described nozzle 6 is 30mm～60mm;
Described is 25～80m by nozzle 6 to the nitrogen amount that sediment outflow pipe 7 injects
3/ min;
The nitrogen of described injection also can be other non-combustible gas;
When adopting gas drilling, for security implementation when running into gas-bearing formation pulls out of hole or the construction of brill down, in advance at one 90 corner of spending of sediment outflow pipeline stage casing design, the position of corner should be apart from sediment outflow pipeline 7 outlets 20～30m, the leading portion of corner is the sediment outflow pipeline that leads to well head 9, the back segment of corner leads to the outlet of sediment outflow pipeline 7, at angle position the nozzle 6 of a spout towards 7 outlets of sediment outflow pipeline is set, and the bypass line 5 with gas supply line is connected with nozzle 6 by No. three ball valves 3 again; Before needs are implemented to pull out of hole or are bored down, earlier with gas to the cleaning that circulates of the landwaste in the well, according to different well depths, adopt gas to carry out being greater than two cycle periods by aboveground gas circulation to the down-hole, be 5～10 minutes circulation timei, and the landwaste that the shaft bottom is stayed is fully carried out well; After finishing circulation, closing No. two ball valves 2 stops by standpipe 11 gas injection in well, stop circulation, open No. three ball valves 3 of bypass line 5 then, pass through bypass line 5 to nozzle 6 air feed by gas injection equipment 1, because nozzle 6 is arranged on sediment outflow pipeline 90 degree corners, its spout is facing to the outlet of sediment outflow pipeline 7, so when nozzle 6 when sediment outflow pipe 7 Way outs spray nitrogen, the leading portion that well head 9 is led in sediment outflow pipeline 7 corners will form negative pressure state, the fuel gas that comes out through well head from the down-hole is produced swabbing action, the fuel gas that will overflow in the pit shaft sucks row's sand tube line 7 in the lump, and is discharged to the landwaste pond 8 away from well head 9, and by ignition, therefore, just do not have spreading of fuel gas on the rig floor 10; For the sake of security, when implementing the negative pressure suction and discharging fuel gas, on rig floor 10, combustible gas detector is set, as has measured fuel gas and overflow, just from per minute 25m
3The nitrogen injection rate increase to per minute 50m gradually
3The nitrogen injection rate, suction capactity is strengthened, do not have fuel gas to overflow up to rig floor 10, come into effect then and pull out of hole or bore down; Implementing nitrogen injection and implement for the purpose of insuring, can also on rig floor 10, to be provided with and to open explosion-proof fan in the process of rig floor fuel gas detection, so that accelerate the speed air flow in well head 9 environment;
Advantage of the present invention and beneficial effect: the method for the nitrogen injection of employing, because gas injection rate can be controlled, so under the situation of amount greater than underground fuel gas spill-out of nitrogen injection, can produce the negative pressure effect at the sediment outflow pipeline, take the fuel gas that overflow the down-hole out of well head, the outlet that makes it pass through the sediment outflow pipeline is burned, the fuel gas of setting up detects and explosion-proof fan can play the effect that the shop helps, making pulls out of hole or bore down is operated in the well head enforcement that does not have fuel gas to spread, can improve when the using gases drilling well, when the safety of boring the round trip after meeting gas-bearing formation, and be simple and easy to implement.
Description of drawings:
Figure is a schematic flow sheet of the present invention.
The specific embodiment:
Provide embodiments of the invention below in conjunction with accompanying drawing: the present invention is based on the basis of hydrodynamics and fluid numerical simulation technology, a kind of method of safely tripping gas drilling tool in case of encountering air layer is provided, finish by following several steps: in order to realize aspirating the fuel gas that overflow the down-hole, at first sediment outflow pipeline 7 is designed to the pipeline that a middle part has 90 degree corners, at angle position the nozzle 6 of a spout towards 7 outlets of sediment outflow pipeline is installed, nozzle 6 is installed in apart between sediment outflow pipe 7 outlets 20～30m, and nozzle 6 diameters of setting are 30mm～60mm; Again bypass line 5 is connected with nozzle 6 by No. three ball valves 3; Before implementing the work that makes a trip, for the landwaste that the down-hole is existed is sprayed well head by the gas of down-hole, before pulling out of hole or boring down, need well is carried out circulation greater than two cycle periods, according to the well depth difference, using gases is 5～10 minutes to the circulation timei of well, fully carries the purpose that the shaft bottom landwaste goes out well so that reach; After finishing gas circulation, closing No. two ball valves 2 stops to standpipe 11 gas injections, open ball valve 3 then No. three, by gas injection equipment 1 by No. three ball valves 3 and bypass line 5 to nozzle 6 gas injections, and pass through nozzle 6 and spray nitrogen to sediment outflow pipe 7 Way outs, be 25～50m through nozzle 6 to the nitrogen that sediment outflow pipe 7 injects
3/ min, when not having the situation of nitrogen, the nitrogen of injection also can be other non-combustible gas; Because nozzle 6 is arranged on sediment outflow pipeline 90 degree corners, its spout is facing to the outlet of sediment outflow pipeline 7, so when nozzle 6 when sediment outflow pipe 7 Way outs spray nitrogen, the leading portion that well head 9 is led in sediment outflow pipeline 7 corners will form negative pressure state, the gas that comes out through well head from the down-hole is produced swabbing action, the fuel gas that will overflow in the pit shaft sucks row's sand tube 7 in the lump, and from landwaste pond 8 discharges away from well head 9, ignition, therefore, just do not have spreading of fuel gas on the rig floor 10; For the sake of security, when implementing the negative pressure suction and discharging fuel gas, on rig floor 10, combustible gas detector is set, as has measured fuel gas and overflow, just from per minute 25m
3The nitrogen injection rate increase to per minute 80m gradually
3The nitrogen injection rate, suction capactity is strengthened, do not have fuel gas to overflow up to rig floor 10, come into effect then and pull out of hole or bore down; Implementing nitrogen injection and implement for the purpose of insuring, can also on rig floor 10, to be provided with and to open explosion-proof fan in the process of rig floor fuel gas detection, so that accelerate the speed air flow in well head 9 environment;
Be embodiments of the invention below:
Embodiment 1:
With clean brook, domestic somewhere 2 wells is example, and clean brook 2 wells are opened the 311.2mm well two and adopted 120m
3When/min nitrogen creeps into to well depth 2338.67m, occur gas survey unusual, total hydrocarbon content by
29.3%, the high 5～8m of exit point flame; When circulation is drilled into pull length 2645.20m, the outlet fray-out of flame, this moment, total hydrocarbon content was 6.28%; 5 of 203.2mm drill collars, 1 in 203.2mm damper, 3 of 228.9mm drill collars are arranged in this time drilling assembly, and institute uses the rotating blowout preventer latus rectum to be 190mm, can not pass through this drill collar; Converting out daily output tolerance by the tolerance ratio is 10851.84m
3, overflow for fear of fuel gas and to cause the generation of complex situations to well head, playing the method that has adopted safely tripping gas drilling tool in case of encountering air layer to the 203.2mm drill collar:
Well depth was 2645.20m when this well pulled out of hole, because this well total hydrocarbon content is 6.28%, above firing the limit, so the preceding 120m of employing pulls out of hole
3/ min nitrogen is to the well 8min that circulates, and the cycle period that uses nitrogen that well is carried out is two more than the cycle period; The nozzle 6 that at distance sediment outflow pipeline outlet 30m place a diameter to be set be 50mm, the spout of nozzle 6 faces toward the outlet of sediment outflow pipeline; Rise when being drilled into the 203.2mm drill collar, close No. two ball valves 2 and stop nitrogen injection in well, open ball valve 3 No. three,, inject 60m by nozzle 6 to sediment outflow pipeline 7 again by bypass line 5
3/ min nitrogen; After the beginning gas injection, make sediment outflow pipeline 7 produce swabbing action, the fuel gas of down-hole is with to the sediment outflow pipeline, and burned, pull down the glue heart of rotating blowout preventer then, adopt combustible gas monitor to measure rig floor face fuel gas content simultaneously, do not have demonstration, normally finished the operation of drill collar; Higher during this well pulls out of hole owing to total hydrocarbon content, so adopted 60m
3/ min nitrogen makes the sediment outflow pipeline produce the negative pressure suction, has reached good effect, and the no fuel gas of rig floor table top monitoring shows in the whole trip-out process, has avoided fuel gas to overflow the potential safety hazard of bringing;
Embodiment 2:
With domestic certain earthworm 101 well is example, and Long101Jing opens the 311.2mm well two and adopts 150m
3/ min air drilling is to well depth 2115.60m, occur gas survey unusual, total hydrocarbon content by
0.2459%, pull out of hole when creeping into to well depth 2476.90m, this moment, total hydrocarbon content was 0.68%; 203.2mm, each two post of 228.9mm drill collar are arranged in this time drilling assembly, and institute uses the glue heart latus rectum of rotating blowout preventer to be 195mm, can not pass through this drill collar; By the conversion of tolerance ratio, daily output tolerance is 1468.8m
3, overflow for fear of fuel gas and to cause the generation of complex situations to well head, playing to the 203.2mm drill collar the method for safely tripping gas drilling tool in case of encountering air layer:
Long101Jing is drilled into well depth 2476.90m, because the total hydrocarbon content of this well is 0.68%, when the air capacity of injecting is 150m
3During/min, do not fire the limit with regard to not reaching, so, before pulling out of hole, this well adopts 150m
3/ min air is to the well 10min that circulates, and the cycle period that uses air that well is carried out is three more than the cycle period; The nozzle 6 that at distance sediment outflow pipeline outlet 30m place a diameter to be set be 30mm, the spout of nozzle 6 faces toward the outlet of sediment outflow pipeline; Rise when being drilled into the 203.2mm drill collar, close No. two ball valves 2 and stop nitrogen injection in well, open ball valve 3 No. three,, inject 30m by nozzle 6 to sediment outflow pipeline 7 again by bypass line 5
3/ min nitrogen is because the tolerance of injecting has only 30m
3/ min, thus air can not be used, otherwise fuel gas that the down-hole is drawn out of and Air mixing content will be above firing the limit, so implementing can only to use nitrogen when suction is set up in gas injection; After setting up the suction circulation, pull down the glue heart of rotating blowout preventer, adopt combustible gas monitor to measure rig floor face fuel gas content simultaneously, nothing shows; Normally finished the drill collar operation; This well is when setting up cycle period, because the air capacity of injecting is 150m
3/ min after the fuel gas of down-hole mixes, can not reach the limit that fires, so adopt air to circulate, has saved the expense of nitrogen, has also just saved the cost of drilling well; When setting up the negative pressure suction, because the tolerance of injecting only is 30m
3/ min under the situation of this injection rate, if continue to use air, reaches the limit that fires after will making fuel gas that the down-hole is drawn out of and the air capacity of injection being mixed, and just might fire, and carries out so must change notes nitrogen; This test has reached good effect, and the no fuel gas of rig floor table top monitoring shows in the whole trip-out process, has avoided fuel gas to overflow the potential safety hazard of bringing.
Claims (5)
1. the method for a safely tripping gas drilling tool in case of encountering air layer is characterized in that:
The first step is provided with the corner of one 90 degree in the middle part of sediment outflow pipeline, at angle position the nozzle of a spout towards the outlet of sediment outflow pipeline is set, and again the bypass line in the gas supply line is connected to nozzle by No. three ball valves;
Second step, elder generation before pulling out of hole or boring down carried out circulation greater than two cycle periods with nitrogen to well, and be 5～10 minutes circulation timei;
The 3rd step closed No. two ball valves and stops gas injection in well after finishing the circulation that second step required, and opened ball valve simultaneously No. three, by gas injection equipment by No. three ball valves and bypass line, again by nozzle to sediment outflow pipe nitrogen injection;
The 4th step adopted combustible gas detector to detect overflowing of fuel gas on rig floor, if any overflowing the discharge capacity that then increases nitrogen injection, to not having fuel gas to overflow to rig floor, came into effect then and pulled out of hole or brill down.
2. the method for safely tripping gas drilling tool in case of encountering air layer according to claim 1 is characterized in that: described middle part at the sediment outflow pipeline is provided with the position of 90 degree corners apart from sediment outflow pipe outlet 20～30m.
3. the method for safely tripping gas drilling tool in case of encountering air layer according to claim 1, it is characterized in that: the diameter of described nozzle is 30mm～60mm.
4. the method for safely tripping gas drilling tool in case of encountering air layer according to claim 1 is characterized in that: described is 25～80m by nozzle to the nitrogen amount that the sediment outflow pipe injects
3/ min.
5. the method for safely tripping gas drilling tool in case of encountering air layer according to claim 1, it is characterized in that: the nitrogen of described injection also can be other non-combustible gas.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102392614A (en) * | 2011-09-22 | 2012-03-28 | 中国石油集团川庆钻探工程有限公司 | Wellhead pressure pumping device |
| CN109736737A (en) * | 2019-01-04 | 2019-05-10 | 中国石油集团川庆钻探工程有限公司 | Method for snubbing tripping of reservoir gas drilling well |
| CN110410040A (en) * | 2019-09-06 | 2019-11-05 | 中国石油集团川庆钻探工程有限公司 | Safe operation system based on adjustable annular pumping helps row well head combustible gas |
| CN110410041A (en) * | 2019-09-06 | 2019-11-05 | 中国石油集团川庆钻探工程有限公司 | Well head safety operation system based on axial inclined jet suction aided discharge |
| CN110529076A (en) * | 2019-08-30 | 2019-12-03 | 中国石油集团川庆钻探工程有限公司 | Safe operation method for sucking combustible gas at wellhead by inert gas |
| CN110566162A (en) * | 2019-09-06 | 2019-12-13 | 中国石油集团川庆钻探工程有限公司 | Safe operation method based on adjustable annular pumping and discharge-assisting wellhead combustible gas |
| CN110821445A (en) * | 2019-10-16 | 2020-02-21 | 中国石油集团川庆钻探工程有限公司 | Nitrogen pumping operation method under condition of low-volume natural gas formation |
| CN112647848A (en) * | 2020-11-30 | 2021-04-13 | 中海石油（中国）有限公司天津分公司 | Deep well drilling process simulation experiment device and experiment method |
| CN113374417A (en) * | 2021-05-10 | 2021-09-10 | 袁华纲 | Explosion-proof drilling equipment is used in well drilling |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110529076A (en) * | 2019-08-30 | 2019-12-03 | 中国石油集团川庆钻探工程有限公司 | Safe operation method for sucking combustible gas at wellhead by inert gas |
| CN110410040A (en) * | 2019-09-06 | 2019-11-05 | 中国石油集团川庆钻探工程有限公司 | Safe operation system based on adjustable annular pumping helps row well head combustible gas |
| CN110410041A (en) * | 2019-09-06 | 2019-11-05 | 中国石油集团川庆钻探工程有限公司 | Well head safety operation system based on axial inclined jet suction aided discharge |
| CN110566162A (en) * | 2019-09-06 | 2019-12-13 | 中国石油集团川庆钻探工程有限公司 | Safe operation method based on adjustable annular pumping and discharge-assisting wellhead combustible gas |
| CN110566162B (en) * | 2019-09-06 | 2022-04-08 | 中国石油集团川庆钻探工程有限公司 | Safe operation method based on adjustable annular pumping and discharge-assisting wellhead combustible gas |
| CN110410041B (en) * | 2019-09-06 | 2024-04-16 | 中国石油集团川庆钻探工程有限公司 | Wellhead safety operation system based on axial oblique spraying suction auxiliary discharge |
| CN110821445A (en) * | 2019-10-16 | 2020-02-21 | 中国石油集团川庆钻探工程有限公司 | Nitrogen pumping operation method under condition of low-volume natural gas formation |
| CN112647848A (en) * | 2020-11-30 | 2021-04-13 | 中海石油（中国）有限公司天津分公司 | Deep well drilling process simulation experiment device and experiment method |
| CN113374417A (en) * | 2021-05-10 | 2021-09-10 | 袁华纲 | Explosion-proof drilling equipment is used in well drilling |
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Application publication date: 20101222 |