CN104165033A - Drilling fluid circulating system for nitrogen foam drilling - Google Patents
Drilling fluid circulating system for nitrogen foam drilling Download PDFInfo
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- CN104165033A CN104165033A CN201310183372.8A CN201310183372A CN104165033A CN 104165033 A CN104165033 A CN 104165033A CN 201310183372 A CN201310183372 A CN 201310183372A CN 104165033 A CN104165033 A CN 104165033A
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- liquid nitrogen
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- foam
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Abstract
The invention discloses a drilling fluid circulating system for nitrogen foam drilling. To overcome the defect that due to the fact that the nitrogen generating equipment matching investment in existing nitrogen foam drilling is large, the drilling cost is high, a liquid nitrogen pump of the drilling fluid circulating system is driven by a diesel engine. The inlet end of the liquid nitrogen pump is communicated with a liquid nitrogen tank truck through a pipeline, and the outlet end of the liquid nitrogen pump is connected with a liquid nitrogen evaporator through a pipeline. The liquid nitrogen evaporator is arranged in a mud pool. The outlet end of the liquid nitrogen evaporator is communicated with the inlet end of a foam generator through a pipeline, and the outlet end of the foam generator is communicated with a well mouth through a pipeline. A drilling fluid draining pipeline is installed in the well mouth and is provided with a gas-fluid separator. A mud pump is driven by the diesel engine, the inlet end of the mud pump is communicated with the mud pool through a pipeline, and the outlet end of the mud pump is communicated with the foam generator through a pipeline. The drilling fluid circulating system has the advantages of being simple in structure, the procedure of acquiring the nitrogen needed by nitrogen foam drilling is effectively simplified, nitrogen drilling can be popularized on a large scale, the drilling speed is improved, and the drilling cost is finally reduced.
Description
Technical field
The present invention relates to a kind of device that nitrogen foam drilling well desired gas is provided, especially relate to a kind of drilling-fluid circulation system of nitrogen foam drilling well.
Background technology
Under balance pressure drilling is the new technology of a ripe and drilling well developing rapidly the nineties in 20th century.In the U.S., under balance pressure drilling is called as upstream petroleum industry new technology, has become drilling technology Hot spots for development, and combines with horizontal well, multilateral well and SLIM-HOLE DRILLING TECHNOLOGY more and more.The advantage of under balance pressure drilling is to improve the rate of penetration that hard formation creeps into, and reduces leakage, differential sticking, formation damage etc., is conducive to find in time Oil/gas Well stratum, and improves output.
At present, developed multiple under-balanced drilling technologies such as having formed air drilling, nitrogen foam drilling well, gas drilling, aeration drilling, nozzling while drilling, under balance pressure drilling is widely used.In the time creeping into reservoir, mix with natural gas for fear of air and produce down-hole blasting accident, conventionally adopt nitrogen as taking rock medium.Nitrogen foam under-balanced drilling technology is also one, when nitrogen foam drilling well refers to drilling well using a large amount of nitrogen dispersions a small amount of containing the technology as circulatory mediator in the liquid of frother (surfactant), there is raising rate of penetration, extend drilling life of bit, shorten drilling period, reduce drilling cost, reducing drilling failure occurs, avoid occurring well shooting or pit shaft pyrophoricity accident, reduce formation damage, be conducive to find oil-gas reservoir, protection of the environment, reduce the advantages such as well stimulation operation cost, especially in exploitation hyposmosis, low-pressure reservoir, unconventional petroleum resources and old oil gas field transformation aspect play an important role.
The drilling-fluid circulation system (referring to Fig. 1) of existing nitrogen foam drilling well, first isolate airborne nitrogen by air compressor machine 1 and film nitrogen making machine 2, nitrogen forms foam base fluid by supercharger 3 and foam maker 4 and (or directly exports high pressure nitrogen by liquid nitrogen pump vehicle 5, nitrogen forms foam base fluid through foam maker 4), flow through after evolution liquid device 6, the mud pumping with slush pump 7 is mixed into nitrogen foam mud drilling liquid; Then, nitrogen foam mud drilling liquid flows back to mud pit 13 successively after the annular space 10 of standpipe 8, drilling tool 9 and drill string, preventer 11, solid controlling system 12, and drilling fluid completes a circulation.Drilling fluid is by continuous circulation aboveground, down-hole, for nitrogen foam drillng operation provides required drilling fluid.
Nitrogen foam drilling fluid is mixed by drilling mud base fluid, foaming agent and nitrogen.Wherein, the generation of nitrogen is many to be realized by on-the-spot nitrogen making machine, then by compressor, foam-making apparatus, booster pump, it is mixed with mud base fluid, forms nitrogen foam drilling fluid.Also can produce high pressure nitrogen by liquid nitrogen pump vehicle 5 mixes with foaming agent, mud base fluid and forms nitrogen foam drilling fluid.No matter produce nitrogen by nitrogen making machine, compressor, booster pump or the mode by liquid nitrogen pump vehicle, all have that the equipment of making nitrogen is supporting to have high input, cause the deficiency that drilling cost is high, restricted applying of nitrogen foam drilling technology.
Summary of the invention
In order to overcome in existing nitrogen foam drilling well, the equipment of making nitrogen is supporting to have high input, and causes the deficiency that drilling cost is high, the invention provides a kind of drilling-fluid circulation system of nitrogen foam drilling well.
The technical solution adopted for the present invention to solve the technical problems is: the drilling-fluid circulation system of nitrogen foam drilling well comprises foam maker, slush pump, mud pit, and liquid nitrogen pump is by diesel engine drives; The arrival end of liquid nitrogen pump is by pipeline and liquid nitrogen tank car UNICOM, and the port of export of liquid nitrogen pump is connected with liquid nitrogen evaporator by pipeline; Liquid nitrogen evaporator is placed in described mud pit.The port of export of liquid nitrogen evaporator is by the entrance point UNICOM of pipeline and foam maker, and the port of export of foam maker is by pipeline and well head UNICOM; Well head is provided with drilling fluid discharge pipe, and the other end of drilling fluid discharge pipe leads to mud pit, on drilling fluid discharge pipe, gas-liquid separator is installed.Slush pump is by diesel engine drives, and the arrival end of slush pump is by pipeline and mud pit UNICOM, and the port of export of slush pump is by pipeline and foam maker UNICOM.On the connecting line of liquid nitrogen evaporator and foam maker, ball-and-seat is installed; On the connecting line of slush pump and foam maker, ball-and-seat is installed.
The invention has the beneficial effects as follows, simple in structure, effectively simplify the flow process that obtains the required nitrogen of nitrogen foam drilling well, be conducive to large-scale popularization nitrogen injection drilling, improve bit speed, finally reduce drilling cost.
Brief description of the drawings
Fig. 1 is existing nitrogen foam drilling well circulation process figure.
Fig. 2 is the drilling-fluid circulation system flow chart of nitrogen foam drilling well of the present invention.
In figure: 1. air compressor machine, 2. film nitrogen making machine, 3. supercharger, 4. foam maker, 5. liquid nitrogen pump vehicle, 6. evolution liquid device, 7. slush pump, 8. standpipe, 9. drilling tool, 10. annular space, 11. preventers, 12. solid controlling systems, 13. mud pits, 21. Diesel engines, 22. liquid nitrogen pumps, 23. liquid nitrogen tank cars, 24. Diesel engines, 25. drilling fluid discharge pipes, 26. well heads, 27. gas-liquid separators, 28. ball-and-seats, 29. liquid nitrogen evaporators.
Detailed description of the invention
Below in conjunction with accompanying drawing 2 and embodiment, the invention will be further described.But those skilled in the art should know, the invention is not restricted to listed detailed description of the invention, as long as spirit according to the invention all should be included in protection scope of the present invention.
Referring to accompanying drawing 2.The liquid nitrogen pump 22 of the drilling-fluid circulation system of nitrogen foam drilling well is driven by Diesel engine 21; The arrival end of liquid nitrogen pump 22 is by pipeline and liquid nitrogen tank car 23 UNICOMs, and the port of export of liquid nitrogen pump 22 is connected with liquid nitrogen evaporator 29 by pipeline.Liquid nitrogen evaporator 29 is placed in mud pit 13; The port of export of liquid nitrogen evaporator 29 is by the entrance point UNICOM of pipeline and foam maker 4, and the port of export of foam maker 4 is by pipeline and well head 26 UNICOMs.
Well head 26 is provided with drilling fluid discharge pipe 25, and the wellbore fluid of discharging from drilling fluid discharge pipe 25 other ends leads to mud pit 13; Gas-liquid separator 27 is installed on drilling fluid discharge pipe 25, and drilling well is discharged liquid gas after gas-liquid separator 27 and is emitted, and liquid returns in mud pit 13.
Slush pump 7 is driven by Diesel engine 24, and the arrival end of slush pump 7 is by pipeline and mud pit 13 UNICOMs, and the port of export of slush pump 7 is by pipeline and foam maker 4 UNICOMs.
On the connecting line of liquid nitrogen evaporator 29 and foam maker 4, ball-and-seat 28 is installed; On the connecting line of slush pump 7 and foam maker 4, ball-and-seat 20 is installed.
The drilling-fluid circulation system of nitrogen foam drilling well of the present invention is to utilize liquid nitrogen heat absorption evaporation to become the principle of nitrogen, produces the needed nitrogen of nitrogen foam drilling well.By Diesel engine 21(or motor) drive liquid nitrogen pump 22 liquid nitrogen is transported to liquid nitrogen evaporator 23, in mud slurry environments by liquid nitrogen evaporator 23 as for mud pit 13, the underground heat that utilizes mud liquid to take out of in drillng operation cyclic process, in liquid nitrogen evaporator 23, realize interchange of heat, liquid nitrogen is changed into nitrogen, and the mud base fluid mixture of getting with slush pump 7, form nitrogen foam drilling fluid through foam maker 4, for drilling well.
As everyone knows, drilling fluid (mud) is the cyclic flusher medium using in drilling process, absorbs underground heat, absorb the heat that drill bit, drilling tool and rock frictional test produce, there is higher temperature, and by continuous circulation aboveground, down-hole, there is all the time higher heat.Utilize mud underground heat not need separately to join thermal source, make the present invention there is feature energy-conservation, easy realization.
Heat in liquid nitrogen evaporator 29 absorbent slurry decreases mud temperature.On the one hand, drilling fluid temperature reduction is generally no more than 10 degree, in engineering, can accept; On the other hand, reduce drilling fluid temperature for high temperature reservoir and be conducive to the exploitation of oil (gas) Tibetan.
Plant-manufactured cheap liquid nitrogen is housed in the liquid nitrogen tank car 23 in the drilling-fluid circulation system of nitrogen foam drilling well of the present invention, be transported to behind well site, offer liquid nitrogen pump 13 by pipeline, liquid nitrogen pump 13 is selected high-pressure plunger pump conventionally, liquid nitrogen pressure can be risen to the required operating pressure of drilling well.Liquid nitrogen becomes high-pressure liquid nitrogen through liquid nitrogen pump 13 and enters the liquid nitrogen evaporator 29 being immersed in mud pit 13, high-pressure liquid nitrogen in liquid nitrogen evaporator 29 has absorbed the underground heat in mud, be evaporated to gases at high pressure, by mixing with foaming agent, mud, form nitrogen foam drilling liquid flow to well head, for the operation of nitrogen foam wellbore construction.
The nitrogen injection drilling desired gas device that the drilling-fluid circulation system of nitrogen foam drilling well of the present invention provides, simple in structure, have obtain the required gas of nitrogen foam drilling well easily, the low feature of nitrogen cost processed, be conducive to be applied to nitrogen injection drilling, improve bit speed, finally reduce drilling cost.
It should be noted that above-described embodiment is example and unrestricted the present invention, those skilled in the art can design a lot of alternate embodiments and not depart from the claim scope of this patent.
Claims (2)
1. a drilling-fluid circulation system for nitrogen foam drilling well, comprises foam maker, slush pump, mud pit, it is characterized in that:
Liquid nitrogen pump (22) is driven by Diesel engine (21); The arrival end of liquid nitrogen pump (22) is by pipeline and liquid nitrogen tank car (23) UNICOM, and the port of export of liquid nitrogen pump (22) is connected with liquid nitrogen evaporator (29) by pipeline;
Described liquid nitrogen evaporator (29) is placed in described mud pit (13); The port of export of liquid nitrogen evaporator (29) is by the entrance point UNICOM of pipeline and foam maker (4), and the port of export of foam maker (4) is by pipeline and well head (26) UNICOM;
Described well head (26) is provided with drilling fluid discharge pipe (25), and the other end of drilling fluid discharge pipe (25) leads to mud pit (13), and gas-liquid separator (27) is installed on drilling fluid discharge pipe (25);
Described slush pump (7) is driven by Diesel engine (24), and the arrival end of slush pump (7) is by pipeline and mud pit (13) UNICOM, and the port of export of slush pump (7) is by pipeline and foam maker (4) UNICOM.
2. the drilling-fluid circulation system of nitrogen foam drilling well according to claim 1, is characterized in that: on the connecting line of described liquid nitrogen evaporator (29) and foam maker (4), ball-and-seat (28) is installed; On the connecting line of described slush pump (7) and foam maker (4), ball-and-seat (28) is installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310183372.8A CN104165033B (en) | 2013-05-17 | 2013-05-17 | The drilling-fluid circulation system of nitrogen foam drilling well |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310183372.8A CN104165033B (en) | 2013-05-17 | 2013-05-17 | The drilling-fluid circulation system of nitrogen foam drilling well |
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| Publication Number | Publication Date |
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| CN104165033A true CN104165033A (en) | 2014-11-26 |
| CN104165033B CN104165033B (en) | 2016-11-09 |
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| CN201310183372.8A Active CN104165033B (en) | 2013-05-17 | 2013-05-17 | The drilling-fluid circulation system of nitrogen foam drilling well |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108525166A (en) * | 2017-03-01 | 2018-09-14 | 中国石油化工股份有限公司 | It is a kind of to utilize the foam production method of liquid nitrogen and its application and extinguishing method |
| US11559711B2 (en) | 2017-03-01 | 2023-01-24 | China Petroleum & Chemical Corporation | Foam producing method, fire extinguishing method, and appliance for foam extinguishing |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US6276455B1 (en) * | 1997-09-25 | 2001-08-21 | Shell Offshore Inc. | Subsea gas separation system and method for offshore drilling |
| CN102140903A (en) * | 2010-02-03 | 2011-08-03 | 中国石油集团渤海石油装备制造有限公司 | Heat recovery type liquid nitrogen evaporation system |
| CN202202850U (en) * | 2011-08-06 | 2012-04-25 | 中国石油化工股份有限公司 | Multi-medium oil displacement physical simulation experiment device |
| CN202788696U (en) * | 2012-06-01 | 2013-03-13 | 中国石油天然气集团公司 | Tubular column nitrogen foam san washing flushing device |
| CN203285371U (en) * | 2013-05-17 | 2013-11-13 | 中国石油天然气集团公司 | Drilling fluid circulation system for nitrogen foam drilling |
-
2013
- 2013-05-17 CN CN201310183372.8A patent/CN104165033B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6276455B1 (en) * | 1997-09-25 | 2001-08-21 | Shell Offshore Inc. | Subsea gas separation system and method for offshore drilling |
| CN102140903A (en) * | 2010-02-03 | 2011-08-03 | 中国石油集团渤海石油装备制造有限公司 | Heat recovery type liquid nitrogen evaporation system |
| CN202202850U (en) * | 2011-08-06 | 2012-04-25 | 中国石油化工股份有限公司 | Multi-medium oil displacement physical simulation experiment device |
| CN202788696U (en) * | 2012-06-01 | 2013-03-13 | 中国石油天然气集团公司 | Tubular column nitrogen foam san washing flushing device |
| CN203285371U (en) * | 2013-05-17 | 2013-11-13 | 中国石油天然气集团公司 | Drilling fluid circulation system for nitrogen foam drilling |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108525166A (en) * | 2017-03-01 | 2018-09-14 | 中国石油化工股份有限公司 | It is a kind of to utilize the foam production method of liquid nitrogen and its application and extinguishing method |
| US11559711B2 (en) | 2017-03-01 | 2023-01-24 | China Petroleum & Chemical Corporation | Foam producing method, fire extinguishing method, and appliance for foam extinguishing |
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| CN104165033B (en) | 2016-11-09 |
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