CN100494623C - Low-pressure drilling technology using double-wall drill pipe - Google Patents
Low-pressure drilling technology using double-wall drill pipe Download PDFInfo
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- CN100494623C CN100494623C CNB2006101349848A CN200610134984A CN100494623C CN 100494623 C CN100494623 C CN 100494623C CN B2006101349848 A CNB2006101349848 A CN B2006101349848A CN 200610134984 A CN200610134984 A CN 200610134984A CN 100494623 C CN100494623 C CN 100494623C
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Abstract
The invention relates to an under-balanced drilling technology with double-wall drill pipe for directional and horizontal wells with low-pressure oil reservoir in oilfield. In the technology injecting system comprising aerated joint, rotating control joint, double-wall drill pipe and gas-liquid dividing short segment is made use of to aerate certain compressed air and drilling fluid in well from the circular gap of double-wall drill pipe and central hole in circulating method. The compressed air enters into hole annulus from gas-liquid dividing joint at certain position in well and the drilling fluid returns up at the hole of drill bit. In the hole annulus, gas-liquid mixed segment and pure liquid segment with two different pressure gradient are formed so that unstable U-tubing effect is generated in well cylinder and the purpose of decreasing the pressure of liquid column is achieved. The under-balance drilling technology in invention can realize drilling well in low pressure and remove constraints that hole track of aerated drilling well can not be controlled and power drilling tool can not work normally under the aerated slurry status in aerated drilling process of directional and horizontal wells. It is favor of the popularization of aerated drilling technology.
Description
Technical field:
The present invention relates to a kind of well-drilling technology that is used for oil field low pressure reservoirs directional well horizontal well.
Background technology:
Along with oil field development enters the middle and later periods, numerous main force's block strata pressures is in debt serious, problems such as leakage, bit freezing, oil layer pollution become the difficult point of oil field middle and later periods drilling technology, and brill is adjusted the important means that well (wherein mainly being directional well, horizontal well) is raising main force oil recovery, maintenance oilfield stable production again, thereby becomes the important technology support that solves the above-mentioned difficult point of drilling process at the low-pressure drilling technology of this type of low pressure reservoirs.Low-pressure drilling is meant and uses drilling fluid density to be lower than 1.0g/cm
3Wellbore construction.Generally speaking, use pure liquid phase drilling fluid, density is all greater than 1.0g/cm
3Therefore, the drilling fluid (strictness is said and is circulatory mediator) that low-pressure drilling adopts is not pure liquid phase generally speaking, in particular cases, and as oil-in-water or invert mud, add except the common drilling fluid of lightening material.At present, the main mode of low-pressure drilling is divided into air, atomizing, foam and air-filling well-drilling.The air drilling density scope of application 0～0.02g/cm
3, need to use equipment such as large-scale air compressor and supercharger; The atomizing drilling well density scope of application 0.02～0.07g/cm
3, on the basis of air drilling, also need increase devices such as atomizer pump; The foam drilling density scope of application 0.07～0.60g/cm
3, since foam technology capable of circulation that is that all right is ripe, the foam solution cost height that does not circulate can not widespread adoption; Air-filling well-drilling is standpipe method of gas injection commonly used, and its density scope of application is 0.7～0.9g/cm
3, be present widely used a kind of boring method.The common drawback of above-mentioned low-pressure drilling mode is to use wireless drilling measurer and conventional mud motor in drilling process, therefore also just can't carry out hole trajectory control, limited the range of application of low-pressure drilling technology greatly, particularly the application in horizontal well.
Summary of the invention:
The object of the invention is to provide a kind of can solve air-filling well-drilling hole trajectory control and conventional mud motor operate as normal problem, make the air-filling well-drilling technology can be applied to the particularly double-wall drill pipe low-pressure drilling method of horizontal well drilling of directional well.
Technical scheme of the present invention is as follows:
This kind low-pressure drilling method is to utilize by the rotation gas-charging connection, swivel control head, the injected system that double-wall drill pipe and gas-liquid shunting pipe nipple constitute, in well, fill (pump) from the annular gap of double-wall drill pipe and center hydrophthalmia respectively in the mode of direct circulation and go into a certain amount of compressed air and drilling fluid, compressed air enters bore hole annulus from the gas-liquid tap of a certain position, down-hole, drilling fluid returns from bit port, in the annular space of well, form the gas-liquid mixed section and the pure liquid section of two different pressures gradients, make to produce unsettled " U " type tube effect in the pit shaft, thereby reach the purpose that reduces head of liquid.The amplitude that its shaft bottom head of liquid reduces is by down-hole tap determining positions.The special equipment instrument that the double-wall drill pipe drilling well is adopted comprises well head and down-hole two parts, well head mainly contains air compressor, gas injection pipeline, drilling mud pump, rotation gas-charging connection and double-walled hexagonal kelly, and the down-hole mainly contains double-wall drill pipe, double-walled ball-and-seat (wellhead back pressure control tool), double-wall pipe gas-liquid shunting pipe nipple (double-walled Pneumatic controller).Other also has supporting special use to mend core, drive and mend core, gas-liquid separation equipment, pulse receiver, Signal Terminal demonstration etc.When utilizing low-pressure drilling technology operation provided by the invention, its drilling process is as follows: the compressed air that comes out from air compressor enters the gas passage of double-wall drill pipe through the gas injection pipeline by the outer annular space of rotation gas-charging connection, enters outer annular space between the double-wall drill pipe and the borehole wall through the gas-liquid tap again; The mud that comes out from drilling mud pump enters the central tube of double-wall drill pipe through standpipe, again behind power drilling tool and drill bit cutting carring, mixes with compressed air at the gas-liquid tap with annular space between the common drilling rod from the borehole wall; The outer annular space of gas-liquid mixture fluid between the borehole wall and double-wall drill pipe flows to Separate System of Water-jet under the guide functions of swivel control head, isolated mud flows into circulating tank and uses after the reciprocating sieve desanding, and isolated air then enters atmosphere.In said process, the circulatory mediator at drilling rod center is in pure liquid phase state, is in the gas-liquid two-phase stream mode more than the annular space gas-liquid tap, so just can reduce the circulating pressure of annular space, thereby realize low-pressure drilling.The measurement while drilling process of this kind low-pressure drilling operation is as follows: under the double-wall drill pipe drilling mode, the pulse signal that measurement while-drilling instrument sends is through the mud transmission of common drilling rod and double-wall drill pipe central tube, received by the pulsed signal device, passing to Signal Terminal by cable then shows, can read parameter values such as shaft bottom hole deviation, orientation, tool-face thus, thereby realize the hole trajectory control that directional well or horizontal well creep into.
Double-wall drill pipe low-pressure drilling method provided by the invention can realize low-pressure drilling in directional well, horizontal well drilling process, and can remove the restriction that air-filling well-drilling is subjected to the uncontrollable and mud motor cisco unity malfunction under the fluffy mud state of well track, help applying of air-filling well-drilling technology.
Description of drawings:
Fig. 1 is double-wall drill pipe low-pressure drilling method provided by the invention technological process and the ground installation, the downhole hardware schematic diagram that are adopted.Fig. 2, Fig. 3, Fig. 4 are respectively rotation gas-charging connection 6, double-wall drill pipe 8 and gas-liquid tap 9 structural representations.
The specific embodiment:
The present invention is provided by following examples, is illustrated below in conjunction with accompanying drawing.
As shown in the figure: the technological process that the present invention adopts is made of air compressor 1, gas injection pipeline 2, drilling mud pump 3, pulse receiver 4, Signal Terminal demonstration 5, rotation gas-charging connection 6, swivel control head 7, double-wall drill pipe 8, gas-liquid tap 9 and Separate System of Water-jet 10.Among the figure, label " 11 " is the borehole wall, and label " 12 ", " 13 ", " 14 ", " 15 " are respectively common drilling rod, measurement while-drilling instrument, power drilling tool and drill bit.Wherein, air compressor 1, inflation line 2, drilling mud pump 3, pulse receiver 4, Signal Terminal demonstration 5, Separate System of Water-jet 10 and common drilling rod 12, measurement while-drilling instrument 13, power drilling tool 14 and drill bit 15 are existing or conventional equipment instrument.Wherein, rotation gas-charging connection 6 (Fig. 2) is made up of ectosome 16, gas inlet 17, central tube 18, alignment bearing 19, Limit Bearing 20, during work, central tube 18 rotates with drilling tool, and ectosome 16 does not rotate, central tube 18 is the high-pressure slurry passage, and the gas inlet of ectosome 16 1 sides connects gases at high pressure soft pipeline injecting gas.Double-wall drill pipe 8 (Fig. 3) is made up of urceolus 21 and central tube 22, central tube 22 is made of upper and lower joint and main body three parts, upper and lower end adopts plug-in type to be tightly connected respectively, total centre bore, little annular space, big three passages of annular space, centre bore is the high-pressure slurry passage, little annular space is the gases at high pressure passage, and big annular space returns the gas-liquid common-use tunnel on being.Gas-liquid tap 9 (Fig. 4) is made up of body 23, central tube 24, piston ring 25, spring 26, sealing ring 27, position-limitting pin 28, central tube 24 is annular check valve body, which is provided with piston ring 25, spring 26 and sealing ring 27, body 23 sidewalls are provided with tap hole and balance pipe, and body 23 and central tube 24 are connected to a fixed by position-limitting pin 28.
Claims (1)
1, a kind of double-wall drill pipe low-pressure drilling method, it is characterized in that: this method is to utilize by the rotation gas-charging connection, rotation control joint, the injected system that double-wall drill pipe and gas-liquid shunting pipe nipple constitute, mode with direct circulation pumps into a certain amount of compressed air and drilling fluid from the annular gap and the center hydrophthalmia of double-wall drill pipe respectively in well, compressed air enters bore hole annulus from the gas-liquid tap of a certain position, down-hole, drilling fluid returns from bit port, in the annular space of well, form the gas-liquid mixed section and the pure liquid section of two different pressures gradients, make to produce unsettled " U " type tube effect in the pit shaft, thereby reach the purpose that reduces head of liquid; When utilizing this kind low-pressure drilling technology method, its drilling process is as follows: the compressed air that comes out from air compressor enters the gas passage of double-wall drill pipe through the gas injection pipeline by the outer annular space of rotation gas-charging connection, enters outer annular space between the double-wall drill pipe and the borehole wall through the gas-liquid tap again; The mud that comes out from drilling mud pump,, mixes with compressed air at the gas-liquid tap with annular space between the common drilling rod from the borehole wall again behind power drilling tool and drill bit cutting carring through going into the central tube of double-wall drill pipe through standpipe; The outer annular space of gas-liquid mixture fluid between the borehole wall and double-wall drill pipe, under the guide functions of swivel control head, flow to Separate System of Water-jet, isolated mud flows into circulating tank and uses after the reciprocating sieve desanding, isolated air then enters atmosphere, in said process, the circulatory mediator at drilling rod center is in pure liquid phase state, is in the gas-liquid two-phase stream mode more than the annular space gas-liquid tap, so just, can reduce the circulating pressure of annular space, thereby realize low-pressure drilling; The measurement while drilling process of this kind low-pressure drilling operation is as follows: under the double-wall drill pipe drilling mode, the pulse signal that measurement while-drilling instrument sends is through the mud transmission of common drilling rod and double-wall drill pipe central tube, received by the pulsed signal device, passing to Signal Terminal by cable then shows, can read parameter values such as shaft bottom hole deviation, orientation, tool-face thus, thereby realize the hole trajectory control that directional well or horizontal well creep into.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2006101349848A CN100494623C (en) | 2006-12-18 | 2006-12-18 | Low-pressure drilling technology using double-wall drill pipe |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006101349848A CN100494623C (en) | 2006-12-18 | 2006-12-18 | Low-pressure drilling technology using double-wall drill pipe |
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| CN1995691A CN1995691A (en) | 2007-07-11 |
| CN100494623C true CN100494623C (en) | 2009-06-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103459756A (en) * | 2011-01-14 | 2013-12-18 | 里尔韦尔公司 | Gravity based fluid trap |
Families Citing this family (14)
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| US8839858B2 (en) | 2008-05-23 | 2014-09-23 | Schlumberger Technology Corporation | Drilling wells in compartmentalized reservoirs |
| CN101672159B (en) * | 2009-10-23 | 2012-09-05 | 大庆油田有限责任公司 | Vertical well wall small-bore bare hole horizontal well drilling method for oil-water well |
| CN102322216A (en) * | 2011-06-03 | 2012-01-18 | 东北石油大学 | Laser drilling device |
| CN102383751A (en) * | 2011-07-18 | 2012-03-21 | 陶德明 | Dual-pipe drilling slag removing method and device |
| CN103195364A (en) * | 2013-04-19 | 2013-07-10 | 中国石油大学(北京) | Method and device for reducing well-bottom annulus confining pressure and improving radial horizontal well rock breaking efficiency |
| CN103334709B (en) * | 2013-06-17 | 2016-08-17 | 中国石油集团长城钻探工程有限公司 | A kind of casing annulus gas injection technology |
| CN104234648A (en) * | 2014-07-18 | 2014-12-24 | 东北石油大学 | Underground real-time control system for density of drilling fluid |
| CN105781437B (en) * | 2014-12-22 | 2018-01-26 | 中石化胜利石油工程有限公司钻井工艺研究院 | A kind of double-wall drill pipe well system and boring method |
| CN104763333B (en) * | 2015-04-01 | 2017-09-26 | 中国海洋石油总公司 | A kind of well system and boring method based on subsea pump pressure control |
| CN109899012B (en) * | 2019-01-29 | 2021-07-13 | 重庆市涪陵页岩气环保研发与技术服务中心 | Multi-stage pressure gradient gas lift reverse circulation well drilling leakage prevention method |
| CN111155935B (en) * | 2020-01-21 | 2022-02-15 | 浙江乔兴建设集团有限公司 | Drilling device for liquefying saturated soil |
| CN111155929B (en) * | 2020-03-12 | 2021-07-02 | 中煤科工集团西安研究院有限公司 | Coal mine underground water hole prevention and control high-water-pressure water jacking directional drilling tool and drilling method |
| CN114075937B (en) * | 2020-08-14 | 2023-07-25 | 中国石油天然气股份有限公司 | Control method and device for flushing and bailing sand by adopting double-wall drill rod |
| CN115126431B (en) * | 2022-07-14 | 2023-07-21 | 西南石油大学 | Drilling system with continuous gas injection and constant bottom hole pressure control functions and automatic control method |
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2006
- 2006-12-18 CN CNB2006101349848A patent/CN100494623C/en not_active Expired - Fee Related
Non-Patent Citations (2)
| Title |
|---|
| 冷41-平13水平井钻井技术. 李永和，乔忠明，郭建国.断块油气田，第12卷第4期. 2005 |
| 冷41-平13水平井钻井技术. 李永和，乔忠明，郭建国.断块油气田，第12卷第4期. 2005 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103459756A (en) * | 2011-01-14 | 2013-12-18 | 里尔韦尔公司 | Gravity based fluid trap |
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| CN1995691A (en) | 2007-07-11 |
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| C06 | Publication | ||
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Chinese Petroleum Group Changcheng Drilling Engineering Co., Ltd. Assignor: Liaohe Petroleum Exploration Bureau Contract fulfillment period: 2008.10.17 to 2015.10.16 contract change Contract record no.: 2009990001234 Denomination of invention: Low-pressure drilling technology using double-wall drill pipe Granted publication date: 20090603 License type: Exclusive license Record date: 2009.11.9 |
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| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.10.17 TO 2015.10.16; CHANGE OF CONTRACT Name of requester: CHINA PETROLEUM GROUP GREAT WALL DRILLING ENGINEER Effective date: 20091109 |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090603 Termination date: 20111218 |