CN1256499C - Gas-underbalance well drilling plant and method - Google Patents
Gas-underbalance well drilling plant and method Download PDFInfo
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- CN1256499C CN1256499C CN 02114438 CN02114438A CN1256499C CN 1256499 C CN1256499 C CN 1256499C CN 02114438 CN02114438 CN 02114438 CN 02114438 A CN02114438 A CN 02114438A CN 1256499 C CN1256499 C CN 1256499C
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Abstract
The present invention relates to a well drilling device and a well drilling method for petroleum and gas, particularly to a gas underbalance well drilling device and a gas underbalance well drilling method thereof. The drilling device comprises a gas source, a gas intake pipeline, a gas exhaust pipeline and a drilling tool, wherein the gas intake pipeline and the gas exhaust pipeline connect the gas source with the drilling tool in a well. The present invention is characterized in that the well drilling device also comprises a control switching device connected to the gas intake pipeline of the gas source, and the control switching device is used for detecting and controlling the flow rate and the pressure of gas, and then controls the opening and the closing actions of a valve by detecting the flow rate and the pressure of the gas. A blowout dirt exhaust pipeline is connected with a midway test mechanism which is used for evaluating a reservoir stratum after the reservoir stratum is drilled. The gas intake pipeline on a well mouth is connected with a short circuit mechanism enabling residual gas in the pipeline to reach a short circuit system in time by timely switching, and a ground explosion accident can be prevented from occurring; the flames blown out from the blowout dirt exhaust pipeline can be prevented from extinguishing all the time.
Description
Affiliated technical field: the invention belongs to a kind of oil, natural gas drilling rig, particularly a kind of gas-underbalance well drilling plant.
Background technology: under balance pressure drilling has plurality of advantages than underbalanced drilling; as protect reservoir; accurately estimate the stratum; improve rate of penetration etc.; always by occurrences in human life are good in the industry; but the under balance pressure drilling progress is very slow, once adopts foam atomizing drilling well, its complex process; effect is not remarkable; fail to be further developed, after adopt the gas atomization drilling well again, the technological process that its method such as Fig. 1 provide; gas is after overcompression; directly enter in the well, adopt air drilling, well shooting often takes place in air drilling as a result.As adopt nitrogen to do source of the gas, cost height, complex process.And the technological process of adopting accompanying drawing one exists very big unreliability and safety problem to be difficult to obtain promote.
Though also have the natural gas of employing to carry out drilling well as the drilling well medium, in the gas drilling process, when connecing drilling tool, the residual gas in the drilling tool overflows, and also blast accident can take place; When combustion gas blowdown outlet can make the fire of port extinguish in moment when tolerance reduces; Natural gas drift well site takes place cause hidden danger such as fire.
Summary of the invention: the objective of the invention is to design a kind of gas-underbalance well drilling plant with high security, the technology that exists in the gas under balance pressure drilling is unreliable to solve, the problem of poor stability.
The object of the present invention is achieved like this, design a kind of gas-underbalance well drilling plant, it comprises source of the gas, connects air inlet, extract duct and the drilling tool of drilling tool in source of the gas and the well, it is characterized in that: further comprising the control switching device shifter that on the source of the gas admission line, connects, be used to detect flow, the pressure of control gas, by flow, the pressure of detection gas, and then the control valve switch motion;
On the open flow blowdown pipeline, be connected with the drillstem test device, be used for after opening reservoir, estimate reservoir with boring;
Be connected with short-circuit cycle mechanism on the well head admission line, be used for when fortuitous event occurring, by timely switching, make the interior residual gas of pipe in time reach short-circuit cycle mechanism, the ground explosion accident takes place in prevention; And prevent extinguishing of open flow blowdown pipeline ejiction opening flame all the time.
Described control switching device shifter is to be connected and composed by the flow meter that connects, control testing agency, threshold switch, safety valve, gas compressor, short-circuit cycle mechanism and atomising device, and flow meter is electrically connected with control circuit; On admission line, be connected with atomising device and short-circuit cycle mechanism.
Described atomising device is made of atomizing foamer, topping-up pump, Agitation Tank serial connection.
Described short-circuit cycle mechanism is close to the pipeline and the threshold switch that are connected on the admission line of well site to form, and the output of pipeline communicates with open flow blowdown pipeline ejiction opening, and residual air is discharged.
Described drillstem test device is to be connected in series flow meter, eliminator, pressure meter formation on the open flow blowdown pipeline.
Described flow meter can be the orifice plate flow instrument in the testing arrangement halfway.
Described flow instrument can be an electronic grout flow meter in control testing agency.
Described source of the gas can be that natural gas, nitrogen can also be diesel engine vent gas.
Described gas-underbalance well drilling plant arrives pit shaft from source of the gas gas by the control switching device shifter, and the open flow blowdown pipeline returns out gas in the well and landwaste outside the well, sprays from the open flow blowdown pipeline; The drillstem test device is arranged on the open flow blowdown pipeline, between control switching device shifter and open flow blowdown pipeline ejiction opening, be connected with short-circuit cycle mechanism, open flow blowdown pipeline ejiction opening has ignition mechanism, in drilling process, there are two kinds to detect control, a kind of is detection control when drilling well, detect in the well and in time analyze situation in the well with outer pressure, the flow of well, provide design to inject the gas parameter, analyze gas-bearing formation and whether put in place, whether other problem takes place, as pinpoint the problems, the switch of the timely shut off valve of control switching device shifter stops gas transmission in well; Another kind is to stop boring to detect, and it comprises closes source of the gas, opens short-circuit cycle mechanism, makes residual gas discharge in the pipe; Carry out drillstem test then, the flame of pressure, flow and observation open flow blowdown pipeline ejiction opening by detecting the drillstem test device on the open flow blowdown pipeline understands whether gas-bearing formation puts in place, whether the gas-storing capacity of gas-bearing formation other problem takes place.
Advantage of the present invention is,
(1), in the control switching device shifter, threshold switch, flow meter, control testing agency, pressure meter, gas compressor, atomising device etc. are arranged; This mechanism can realize that source of the gas, pressure, flow safety switch, and has and prevent that when connecing drilling tool natural gas is revealed in the drilling tool, the short-circuit cycle mechanism of the pyrophoricity accident of blasting.When fortuitous event occurring, by timely switching, make the interior residual gas of pipe in time reach short-circuit cycle mechanism, the ground explosion accident takes place in prevention; And remain open flow blowdown pipeline ejiction opening flame burning, prevent fray-out of flame, accident beyond taking place.
(2), adopted the drillstem test device, can estimate reservoir output at any time exactly.
(3), this method both can realize gas drilling, also can realize foam drilling and atomizing drilling well.
This boring method has been obtained success in August, 2000 in the first natural gas under balance pressure drilling of Shan 242 China.
Description of drawings: the present invention will be further described below in conjunction with the embodiment accompanying drawing:
Fig. 1 is the prior art process chart;
Fig. 2 is an embodiment of the invention schematic flow sheet;
Fig. 3 is embodiment of the invention switching control structural representation c
Fig. 4 is an embodiment of the invention drillstem test schematic diagram.
Among the figure, 1, drilling tool; 2, pit shaft; 3, switching control; 4, source of the gas; 5, gas compressor; 6, open flow blowdown pipeline; 7, short-circuit cycle mechanism; 8, drillstem test device; 9, flow instrument; 10, flow meter; 11, threshold switch; 12, control testing agency; 13, air duct, 14, igniter; 15, pressure meter; 16, atomising device; 17, eliminator; 18, atomizing foamer; 19, topping-up pump; 20, Agitation Tank.
Embodiment: as Fig. 2, Fig. 3, shown in Figure 4, gas from source of the gas 4 arrives folding 2 by control switching device shifter 3, and control switching device shifter 3 is to be made of the flow meter 10 that connects, control testing agency 12, threshold switch, safety valve, gas compressor 5, short-circuit cycle mechanism 7 and atomising device 16.
Described atomising device 16 is made of atomizing foamer 18, topping-up pump 19, Agitation Tank 20 serial connections.
Described short-circuit cycle mechanism 7 is close to the pipeline and the threshold switch that are connected on the admission line of well site to constitute, the output of pipeline communicates with open flow blowdown pipeline 6 ejiction openings, residual air is discharged, so that when fortuitous event occurring, by timely switching, make the interior residual gas of pipe in time reach short-circuit cycle mechanism 7, the ground explosion accident takes place in prevention; And prevent extinguishing of open flow blowdown pipeline 6 ejiction opening flames all the time.
Open flow blowdown pipeline 6 from well head returns out gas in the well and landwaste outside the well, from 6 ejections of open flow blowdown pipeline; Drillstem test device 8 is arranged on open flow blowdown pipeline 6, and drillstem test device 8 is used for after opening reservoir, estimates reservoir with boring;
Described drillstem test device 8 is on the open flow blowdown pipeline and connects flow meter 10, eliminator 17, pressure meter 15 formations that as shown in Figure 4, drillstem test device 8 is used for after opening reservoir, with boring the situation of estimating reservoir.
Ejiction opening at open flow blowdown pipeline 6 has ignition mechanism 14, guarantees that outlet opening burns always, to guarantee the safety of system.
Described flow meter 10 can be the orifice plate flow instrument in the testing arrangement 8 halfway.
Described flow instrument 9 can be an electronic grout flow meter in control testing agency 12.
Described source of the gas 4 can be that natural gas, nitrogen can also be diesel engine vent gas.
Described gas compressor 5 is when complex situations (carry as landwaste to go wrong, collapse on a small quantity in the well, problem such as water outlet) take place when the down-hole, the landwaste row that using gases compressor 5 increase pressure flows are finished in the well takes, certainly gas compressor 5 also needs controlled pressure when work, when problem does not take place as above, also will close the work of gas compressor 5 or close the threshold switch of control gas compressor 5 gases on the connecting line.
In invention, whole gas-circulating system seals.
Claims (7)
1, gas-underbalance well drilling plant, it comprises air inlet, extract duct, the drilling tool that connects drilling tool in source of the gas and the well, it is characterized in that: it comprises control switching device shifter, drillstem test device, short-circuit cycle mechanism; On the source of the gas admission line, be connected with the control switching device shifter, on the well head admission line, be connected with short-circuit cycle mechanism, on the open flow blowdown pipeline, be connected with the drillstem test device.
2, gas-underbalance well drilling plant according to claim 1, it is characterized in that: described control switching device shifter is to be connected and composed by flow meter, control testing agency, threshold switch, safety valve, gas compressor, short-circuit cycle mechanism and atomising device, be serially connected with flow meter, threshold switch on the gas source pipe, on the threshold switch and be connected to gas compressor, flow meter and threshold switch are electrically connected with control testing agency; Be connected with atomising device and short-circuit cycle mechanism on the admission line.
3, gas-underbalance well drilling plant according to claim 2 is characterized in that: described atomising device is made of atomizing foamer, topping-up pump, Agitation Tank serial connection.
4, gas-underbalance well drilling plant according to claim 1, it is characterized in that: described short-circuit cycle mechanism discharges residual air by the well site admission line, the output of pipeline communicates with the relief line ejiction opening, at the relief line ejiction opening igniter is arranged, and makes the burning of outlet opening residual air.
5, gas-underbalance well drilling plant according to claim 1 is characterized in that: described drillstem test device is that flow meter, the eliminator that is connected in series on the relief line constitutes.
6, gas-underbalance well drilling plant according to claim 5 is characterized in that: the flow meter in the described drillstem test device is the orifice plate flow instrument.
7, gas-underbalance well drilling plant according to claim 2 is characterized in that: the flow meter in the described control switching device shifter is an electronic grout flow meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02114438 CN1256499C (en) | 2002-02-07 | 2002-02-07 | Gas-underbalance well drilling plant and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02114438 CN1256499C (en) | 2002-02-07 | 2002-02-07 | Gas-underbalance well drilling plant and method |
Publications (2)
| Publication Number | Publication Date |
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| CN1436913A CN1436913A (en) | 2003-08-20 |
| CN1256499C true CN1256499C (en) | 2006-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 02114438 Expired - Fee Related CN1256499C (en) | 2002-02-07 | 2002-02-07 | Gas-underbalance well drilling plant and method |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101781983A (en) * | 2010-03-01 | 2010-07-21 | 中国石油集团川庆钻探工程有限公司 | Method for gas drilling midway test |
| CN102748014A (en) * | 2011-04-19 | 2012-10-24 | 邹灵战 | Quantitative predication method applicable to formation water production before drilling of gas drilling |
| CN111878041B (en) * | 2020-08-13 | 2021-05-18 | 北京方圆天地油气技术有限责任公司 | Coal bed gas horizontal well underbalance drilling system and method thereof |
| CN112112584B (en) * | 2020-09-30 | 2023-11-07 | 中国石油天然气集团有限公司 | Gas pressure maintaining and distributing device and method for gas filling drilling |
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