CN101899961A - Controllable friction type anti-spraying plug inside pipeline and anti-spraying method - Google Patents
Controllable friction type anti-spraying plug inside pipeline and anti-spraying method Download PDFInfo
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- CN101899961A CN101899961A CN2010102554121A CN201010255412A CN101899961A CN 101899961 A CN101899961 A CN 101899961A CN 2010102554121 A CN2010102554121 A CN 2010102554121A CN 201010255412 A CN201010255412 A CN 201010255412A CN 101899961 A CN101899961 A CN 101899961A
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- oil pipe
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- friction type
- plug
- controllable friction
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Abstract
The invention belongs to the industry of oil and gas and relates to a controllable friction type anti-spraying plug inside a pipeline and an anti-spraying method. The anti-spraying method thereof comprises the steps of: directly mounting the controllable friction type anti-spraying plug in a pipeline in the process of drilling down so as to form a differential pressure in an oil shrink-ring, wherein the differential pressure is higher than or equal to a friction formed between the controllable friction type anti-spraying plug and the pipeline, and at this moment, the controllable friction type anti-spraying plug automatically floats upwards and keeps a certain of height in the well. When the blowout occurs, the fluid will form a fluid friction in the oil shrink-ring. When the fluid friction is smaller than the friction between the controllable friction type anti-spraying plug and the pipeline, the plug will not be sprayed out of the well even the blowout occurs in the oil shrink-ring. The plug will be sprayed out of the well only when the blowout liquid volume increases to a certain extent. The invention provides a controllable friction type anti-spraying plug inside a pipeline and an anti-spraying method, with high security, low cost and convenient use.
Description
Technical field
The invention belongs to oil and gas industry, relate to the interior blowout prevention technology of tubing string in drilling well and the underground work going down process, is blowout plug and blowout prevention method in the controllable friction type oil pipe exactly.
Background technology
In the process that makes a trip of drilling well or underground work, can run into well kick or blowout phenomenon, usually adopt the blowout prevention cock on the tubing string top, or adopting the mode of blowout prevention baffle plate to prevent and control blowout in the bottom of drilling tool, this dual mode does not all fundamentally solve well kick or blowout and the gassed problem of well head operating personnel.
Employing is installed in the oil pipe cock at tubing string top, when well kick or blowout take place, under the impact of ejection liquid stream, just is difficult to be installed on the well head in well, often makes loss of well control, and gas blowout accident takes place.Freely open because of oil pipe in the going down process, dissolve toxic and harmful in the liquid in the well, cause the well head operating personnel that gassed personal injury accident takes place.
Adopt blowout prevention baffle plate in the oil pipe, be under when boring, be lowered in the well after connecting with construction tool in advance, because of the oil pipe bottom blocks, to discharge liquid in a large amount of wells when going into well, during pressing crack construction, pour into a large amount of clear water, the price of this blowout prevention baffle plate is also high, and beat the baffle plate operation technique, increase operation, increased construction cost, do not obtained a large amount of applying.
And but the throw-in type tubing plug is for straight well, the top that can throw into pressing crack construction drilling tool hydraulic anchor sets, but when using big cluster well, that is on the high angle hole, this blanking plug is thrown not go down, and does not cross liquid level, will set at liquid level, what have has crossed liquid level, but does not arrive the hydraulic anchor top, does not reach the technological principle requirement of design blowout prevention.
Summary of the invention
The purpose of this invention is to provide blowout plug and blowout prevention method in the controllable friction type oil pipe that a kind of safety is good, cost is low, easy to use.
The object of the present invention is achieved like this, blowout plug in the controllable friction type oil pipe, it is characterized in that: the blowout prevention cock body comprises the cavity housing and is connected the one way valve snap joint of cavity housing one end, the hollow shell body profile is an elongated cylinder, mast is in cavity housing central axis position, the outside, central axis position is a cavity body, between the external wall of cavity body and hollow shell lacquer disk(-sc) is arranged, the inboard inwardly bulge of lacquer disk(-sc), the lacquer disk(-sc) outside is gapped with the external wall of hollow shell, is evenly equipped with the steel wire that diameter is 0.5-27mm in the gap; During use, one way valve snap joint connects air pressure or oil pressure, fills in cavity body with air pressure or oil pressure by one way valve snap joint, adjusts the external arm diameter of hollow shell, can not be with outside the ejection of the blowout prevention cock body in the oil pipe well when guaranteeing blowout.
Describedly fill in cavity body with air pressure or oil pressure by one way valve snap joint, adjusting rubs examines the size of resistance, is according to Bernoulli equation, and the design formulas of on-way resistance is calculated; Because of frictional resistance is less than the pressure that acts on the tubing wall, determine for the pressure that is full of in the stopper according to the friction factor of blowout plug and oil pipe, the liquid flowing resistance * safety factor ÷ friction factor when its value is blowout.
The blowout prevention method of blowout plug in the controllable friction type oil pipe: under when boring, blowout plug in the controllable friction type oil pipe is directly installed in the oil pipe, it is fashionable under drilling tool is always in well, because the oil jacket annular space is communicated with oil pipe, formed the U-shaped tubular structure, when being lowered to drilling tool, when the frictional resistance of blowout plug and oil pipe in the controllable friction type oil pipe greater than sleeve pipe in during the back pressure of liquid, can discharge tens meters fluid column in the sleeve pipe, tubing string continues to be lowered to, the oil jacket annular space forms pressure reduction, the frictional resistance that pressure reduction forms more than or equal to blowout plug and oil pipe in the controllable friction type oil pipe in the oil pipe, the interior blowout plug of controllable friction type oil pipe this moment is under the effect of pressure reduction, and come-up will keep certain height in well automatically.
When blowout took place, liquid failed to be convened for lack of a quorum and the oil jacket annular space forms liquid stream frictional resistance, and frictional resistance can be by the pressure transmission effect of liquid, and pressure transmission outwards ejects it on the blowout plug in the controllable friction type oil pipe; When liquid stream frictional resistance less than the controllable friction type oil pipe in blowout plug during with the oil pipe frictional resistance, even oil jacket annular space generation blowout also can not spray blowout plug in the controllable friction type oil pipe outside the well; When the blowout flow quantity increases, during frictional resistance that its liquid stream frictional resistance forms in oil pipe greater than blowout plug in the controllable friction type oil pipe, then blowout plug in the controllable friction type oil pipe may be discharged outside the well.
Advantage of the present invention is: because the present invention fills in cavity body with air pressure or oil pressure by one way valve snap joint, one way valve snap joint connects air pressure or oil pressure, in cavity body, fill with air pressure or oil pressure by one way valve snap joint, adjust the external arm diameter of hollow shell, reach that adjusting rubs examines the size of resistance, adjustment rubs and examines resistance according to Bernoulli equation, and the design formulas of on-way resistance is calculated.Using coefficient of frictional resistance is these characteristics of a constant, as long as increase the pressure of the interior blowout plug of controllable friction type oil pipe to oil pipe, just can adjust frictional force, and according to the area of well depth and oil jacket annular space, and the discharge capacity of blowout just can calculate frictional resistance.Can not be when guaranteeing blowout with outside the ejection of the blowout prevention cock body in the oil pipe well.
The principle that the present invention taked is different with former oil pipe blowout plug with method, and this oil pipe inner blowout preventer acts on the liquid level of liquid in the oil pipe, neither at the top of oil pipe also not in the bottom of oil pipe, it is the tubing plug that utilizes adjustable frictional resistance.
Description of drawings
The invention will be further described below in conjunction with the embodiment accompanying drawing:
Fig. 1 is the embodiments of the invention structural representations;
Fig. 2 is a technological principle schematic diagram of the present invention.
Among the figure: 1, oil pipe; 2, annular preventer; 3, ram preventer; 4, sleeve valve; 5, sleeve pipe; 6, oil jacket annular space; 7, blowout plug in the controllable friction type oil pipe; 8, oil jacket liquid level difference; 9, cavity housing; 10, one way valve snap joint; 11, mast; 12, lacquer disk(-sc); 13, gap; 14, steel wire.
The specific embodiment
As depicted in figs. 1 and 2, blowout plug in the controllable friction type oil pipe, it is characterized in that: the blowout prevention cock body comprises cavity housing 9 and is connected the one way valve snap joint 10 of cavity housing 9 one ends, cavity housing 9 profiles are elongated cylinder, mast 11 is in cavity housing 9 central axis positions, the outside, central axis position is a cavity body, between cavity body and cavity housing 9 outer walls lacquer disk(-sc) 12 is arranged, lacquer disk(-sc) 12 inboard inwardly bulges, lacquer disk(-sc) 12 outsides and cavity housing 9 outer walls are gapped 13, and being evenly equipped with diameter in the gap 13 is the steel wire 14 of 0.5-27mm.
Oil pipe 1 is connected in the sleeve pipe 5 by wellhead assembly, and sleeve valve 4 is enclosed in well head with well inner sleeve 5 Connection Blocks, is socketed with annular preventer 2 and ram preventer 3 between sleeve valve 4 and the oil pipe 1.During use, one way valve snap joint 10 connects air pressure or oil pressure, fills in cavity body with air pressure or oil pressure by one way valve snap joint 10, adjusts cavity housing 9 outer arm diameters, can not be with outside the ejection of the blowout prevention cock body in the oil pipe 1 well when guaranteeing blowout.
Fill in cavity body with air pressure or oil pressure by one way valve snap joint 10, adjusting rubs examines the size of resistance, and according to Bernoulli equation, the design formulas of on-way resistance is calculated.Because of frictional resistance is less than the pressure that acts on the tubing wall, determine for the pressure that is full of in the stopper according to the friction factor of blowout plug and oil pipe, the liquid flowing resistance * safety factor ÷ friction factor when its value is blowout.
The blowout prevention method of blowout plug in the controllable friction type oil pipe: under when boring, blowout plug 7 in the controllable friction type oil pipe is directly installed in the oil pipe 1, it is fashionable under drilling tool is always in well, because oil jacket annular space 6 is communicated with oil pipe 1, formed the U-shaped tubular structure, when being lowered to drilling tool, when the frictional resistance of blowout plug in the controllable friction type oil pipe 7 and oil pipe 1 greater than sleeve pipe 5 in during the back pressure of liquid, can discharge tens meters fluid column in the sleeve pipe 5, tubing string continues to be lowered to, oil jacket annular space 6 forms pressure reduction, the frictional resistance that pressure reduction forms more than or equal to blowout plug in the controllable friction type oil pipe in the oil pipe 7 and oil pipe 1, the interior blowout plug 7 of controllable friction type oil pipe this moment is under the effect of pressure reduction, and come-up will keep certain height in well automatically.
When blowout took place, liquid failed to be convened for lack of a quorum and oil jacket annular space 6 forms liquid stream frictional resistance, and frictional resistance can be by the pressure transmission effect of liquid, and pressure transmission outwards ejects it on the blowout plug 7 in the controllable friction type oil pipe; When liquid stream frictional resistance less than the controllable friction type oil pipe in blowout plug 7 during with oil pipe 1 frictional resistance, even oil jacket annular space 6 blowouts take place can be with outside the 7 ejection wells of blowout plug in the controllable friction type oil pipe yet; When the blowout flow quantity increases, during frictional resistance that its liquid stream frictional resistance forms oil pipe 1 in greater than blowout plug 7 in the controllable friction type oil pipe, then can be with outside the 7 discharge wells of blowout plug in the controllable friction type oil pipe.
Under when boring, this kind stopper is placed in the oil pipe, squeeze into when blowout reaches the 600L/min discharge capacity to it again, the pressure of the formed frictional resistance value of oil pipe annular space connects other oil pipe G.I.H then.When normal bore down finish after, before pressing crack construction, adopt the method for recoil, outside stopper recoils out well in will manage, guarantee that pipe is interior unimpeded, reaches construction requirement.In when, when boring instantly well kick or blowout taking place, because well head is equipped with annular preventer, big quantity of fluid can be from sleeve valve, be discharged to pollution discharge pond by certain connecting line, at this moment, just the oil pipe cock can be installed like a cork, close the preventer on the well head, reach the requirement of well control, descend the kill job in step again.
Therefore, determine the size of frictional resistance between the interior blowout plug 7 of oil pipe 1 and controllable friction type oil pipe, control the key technology of oil pipe blowout prevention exactly.
The formation of blowout is formed by three phases, that is, and and overflow → well kick → blowout; In overflow and well kick stage, the liquid stream discharge capacity of returning out from oil jacket annular space 6 is very little, the frictional resistance of borehole fluid and oil jacket annular space 6 annular spaces can be ignored, and the frictional resistance of blowout plug 7 is more much bigger than this power in the controllable friction type oil pipe, therefore, can there be the spacious and comfortable time to adopt the measure of arranging card to work as in this stage at the tubing string top, as, sit well head or the blowout prevention cock is installed.
Reach 300L/min when above when returning out discharge capacity, then the blowout phenomenon can occur.The size of borehole fluid and oil jacket annular space 6 frictional resistance is exactly the key foundation of blowout plug 7 frictional resistance values in the design controllable friction type oil pipe; In order to ensure the safety of its blowout prevention, the blowout discharge capacity is brought up to 600L/min, the frictional resistance of blowout plug 7 in the designing and calculating controllable friction type oil pipe.
The calculating of frictional resistance: oil jacket liquid level pressure reduction 8 in the frictional resistance of liquid stream has determined in the controllable friction type oil pipe blowout plug 7 to form in well to manage during blowout in the annular space, the size of oil jacket liquid level pressure reduction 8 is to be determined by the area of the degree of depth of well and oil jacket annular space 6 or size, for different well depths and different annular space areas, can be according to Bernoulli equation, the design formulas of on-way resistance is calculated.Because of frictional resistance is less than the pressure that acts on the tubing wall, determine for the pressure that is full of in the stopper according to the friction factor of blowout plug and oil pipe, the liquid flowing resistance * safety factor ÷ friction factor when its value is blowout.
The adjustment of interior frictional resistance: using coefficient of frictional resistance is these characteristics of a constant, as long as increase the pressure of 7 pairs of oil pipes 1 of blowout plug in this controllable friction type oil pipe, just can adjust frictional force, according to the area of well depth and oil jacket annular space 6, and the discharge capacity of blowout just can calculate frictional resistance.
Claims (3)
1. the blowout prevention method of blowout plug in the controllable friction type oil pipe, it is characterized in that: under when boring, blowout plug (7) in the controllable friction type oil pipe is directly installed in the oil pipe (1), it is fashionable under drilling tool is always in well, because oil jacket annular space (6) is communicated with oil pipe (1), formed the U-shaped tubular structure, when being lowered to drilling tool, when the frictional resistance of blowout plug (7) in the controllable friction type oil pipe and oil pipe (1) greater than sleeve pipe (5) in during the back pressure of liquid, can discharge tens meters fluid column in the sleeve pipe (5), tubing string continues to be lowered to, oil jacket annular space (6) forms pressure reduction, the frictional resistance that pressure reduction forms more than or equal to blowout plug (7) in the controllable friction type oil pipe in the oil pipe and oil pipe (1), and the interior blowout plug (7) of controllable friction type oil pipe this moment is under the effect of pressure reduction, automatically come-up will keep certain height in well;
When blowout took place, liquid failed to be convened for lack of a quorum and oil jacket annular space (6) forms liquid stream frictional resistance, and frictional resistance can be by the pressure transmission effect of liquid, and pressure transmission blowout plug (7) in the controllable friction type oil pipe is gone up it is outwards ejected; When liquid stream frictional resistance less than the controllable friction type oil pipe in blowout plug (7) during with oil pipe (1) frictional resistance, even oil jacket annular space (6) blowout takes place can be with outside blowout plug (7) the ejection well in the controllable friction type oil pipe yet; When the blowout flow quantity increases, during frictional resistance that its liquid stream frictional resistance forms oil pipe (1) in greater than blowout plug (7) in the controllable friction type oil pipe, then can be with outside blowout plug (7) the discharge well in the controllable friction type oil pipe.
2. according to blowout plug in the controllable friction type oil pipe of blowout prevention method design, it is characterized in that: the blowout prevention cock body comprises cavity housing (9) and is connected the one way valve snap joint (10) of cavity housing (9) one ends, cavity housing (9) profile is an elongated cylinder, mast (11) is in cavity housing (9) central axis position, the outside, central axis position is a cavity body, between cavity body and cavity housing (9) outer wall lacquer disk(-sc) (12) is arranged, the inboard inwardly bulge of lacquer disk(-sc) (12), lacquer disk(-sc) (12) outside and cavity housing (9) outer wall gapped (13) are evenly equipped with the steel wire that diameter is 0.5-27mm (14) in gap (13); During use, one way valve snap joint (10) connects air pressure or oil pressure, in cavity body, fill with air pressure or oil pressure by one way valve snap joint (10), adjust cavity housing (9) outer arm diameter, can not be when guaranteeing blowout with outside the ejection of the blowout prevention cock body in the oil pipe (1) well.
3. blowout plug in the controllable friction type oil pipe according to claim 2, it is characterized in that: describedly in cavity body, fill with air pressure or oil pressure by one way valve snap joint (10), adjustment rubs and examines the size of resistance, is according to Bernoulli equation, and the design formulas of on-way resistance is calculated; Because of frictional resistance is less than the pressure that acts on the tubing wall, determine for the pressure that is full of in the stopper according to the friction factor of blowout plug and oil pipe, the liquid flowing resistance * safety factor ÷ friction factor when its value is blowout.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010255412 CN101899961B (en) | 2010-08-17 | 2010-08-17 | Controllable friction type anti-spraying plug inside pipeline and anti-spraying method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010255412 CN101899961B (en) | 2010-08-17 | 2010-08-17 | Controllable friction type anti-spraying plug inside pipeline and anti-spraying method |
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| Publication Number | Publication Date |
|---|---|
| CN101899961A true CN101899961A (en) | 2010-12-01 |
| CN101899961B CN101899961B (en) | 2012-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201010255412 Expired - Fee Related CN101899961B (en) | 2010-08-17 | 2010-08-17 | Controllable friction type anti-spraying plug inside pipeline and anti-spraying method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2158446Y (en) * | 1992-12-14 | 1994-03-09 | 四川石油管理局川西南矿区 | Gas well casing annular damper |
| CN1594826A (en) * | 2003-09-09 | 2005-03-16 | 赵连臣 | Stratum anti-pollution air bag packer |
| US20070113622A1 (en) * | 2005-11-22 | 2007-05-24 | Tdw Delaware, Inc. | Methods and systems for hydrostatic testing a pipeline |
| CN101575955A (en) * | 2009-02-27 | 2009-11-11 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Design method of low-pressure gas well swabbing damper |
| CN201705273U (en) * | 2010-08-17 | 2011-01-12 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Oil tube internal blowout plug with controllable frictional resistance |
-
2010
- 2010-08-17 CN CN 201010255412 patent/CN101899961B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2158446Y (en) * | 1992-12-14 | 1994-03-09 | 四川石油管理局川西南矿区 | Gas well casing annular damper |
| CN1594826A (en) * | 2003-09-09 | 2005-03-16 | 赵连臣 | Stratum anti-pollution air bag packer |
| US20070113622A1 (en) * | 2005-11-22 | 2007-05-24 | Tdw Delaware, Inc. | Methods and systems for hydrostatic testing a pipeline |
| CN101575955A (en) * | 2009-02-27 | 2009-11-11 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Design method of low-pressure gas well swabbing damper |
| CN201705273U (en) * | 2010-08-17 | 2011-01-12 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Oil tube internal blowout plug with controllable frictional resistance |
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| CN101899961B (en) | 2012-12-12 |
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