CN102635321A - High-precision overflow monitoring method during well-drilling process - Google Patents
High-precision overflow monitoring method during well-drilling process Download PDFInfo
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- CN102635321A CN102635321A CN2012101369847A CN201210136984A CN102635321A CN 102635321 A CN102635321 A CN 102635321A CN 2012101369847 A CN2012101369847 A CN 2012101369847A CN 201210136984 A CN201210136984 A CN 201210136984A CN 102635321 A CN102635321 A CN 102635321A
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- mud pit
- mud
- shaped pipe
- indicator
- tubule
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Abstract
The invention provides a high-precision overflow monitoring method during a well-drilling process. According to the method, the amplification of variation of level height of a mud pit is realized by particularly reforming the mud pit, so as to increase the precision of monitoring the liquid level of the mud pit and achieve the purpose of sensitively monitoring the well-drilling overflow. The structure of the mud pit after being reformed comprises the mud pit (1) and an L-shaped pipe (7), wherein the L-shaped pipe (7) comprises a filter screen (3), a stop valve (4), a stirring device (5), an indicator (8), an expanding chamber (9), a small indication pipe (11) and a flange (12). According to the method provided by the invention, the variation of the liquid level in the mud pit is amplified; and the amplification factor is related to a density difference of the indicator and the mud as well as a diameter difference of the expanding chamber and the small indication pipe. The method provided by the invention can be widely applied to the field of overflow monitoring of oil and gas well-drilling engineering.
Description
Technical field
The present invention relates to the overflow monitoring method in a kind of drilling process, this method is to realize the sensitivity monitoring to the drilling well overflow through the amplification to the mud pit liquid level change, belongs to the drilling well monitoring technical field.
Background technology
In drilling process, when bore meeting down-hole high pressure layer and pit shaft head of liquid when being lower than strata pressure again, the drilling well overflow can appear.The drilling well overflow constantly increases can form well kick, if the untimely treatment measures of taking, well yield can progressively increase, and ejecta can get more and more, spray is high more more, and blowout takes place at last.Say that from the angle of drilling engineering the drilling well overflow is found more early good more, particularly when creeping into the high pressure gas-bearing formation; Natural gas with mud from the process that the shaft bottom is returned toward well head; Pressure constantly reduces, and the natural gas volume constantly expands, during more near well head; It is just big more to discharge mud amount, just short more from the time that overflows to blowout.
At present, the overflow monitoring method in the domestic drilling engineering is mainly mud pit level monitoring and imports and exports flow monitoring with mud, and generally carries out artificial observation regularly, and writes down and contrast.The mud pit level monitoring is the minimum and highly effective monitoring means of cost; But because the floor space of mud pit is very big, when the overflow initial stage, spillway discharge was less, the height that mud pit rises was very little; Be difficult to monitor, the sensitivity and the degree of accuracy that cause monitoring descend.Therefore, traditional mud pit level monitoring has certain limitation.The overflow that how produces in the sensitivity monitoring drilling well is also administered early, fundamentally stops the generation of blowout, becomes a difficult problem that needs to be resolved hurrily in the present drilling engineering.
Summary of the invention
The objective of the invention is to problem to overflow monitoring existence in the drilling engineering; A kind of overflow monitoring new method is proposed; This method improves the precision of mud pit level monitoring then through mud pit is carried out the amplification that certain transformation realizes the mud pit level high variable quantity, makes the drilling well overflow be able to more early find; Thereby, effectively solve the difficult problem of overflow monitoring in the oilfield drilling for post-processed wins more quality time.
Above-mentioned mud pit being carried out certain transformation, is to stretch out a L shaped pipe from the side bottom of mud pit, and there is the expansion chamber L shaped pipe top, and the top seal of expansion chamber is extended the reading tubule from its right side, and the reading tubule is answered horizontal positioned.Liquid in top, expansion chamber and reading tubule is indicator, and indicator density is slightly less than mud density, and does not dissolve each other with mud or react, and the solubility of indicator in mud should be less than 0.01g/100gH
2O.At mud pit and L shaped pipe junction filter screen and valve are arranged, mixing plant is arranged in L shaped pipe vertical component bottom.L shaped pipe adopts flange to be connected with the junction of mud pit.Valve can separate mud pit and L shaped pipe, prevents that indicator from getting into mud pit.The effect of filter screen is to prevent that the landwaste in the mud pit from getting in the L shaped pipe, and its sizing grid should be less than the diameter of landwaste, and the material that is adopted should be by mud-corrosion.L shaped pipe should adopt the smooth material of inner surface, prevents that mud is bonded at the L pipe internal surface, the reading tubule should adopt transparent material make and inner surface smooth, make reading more clear.
In the mud pit of above-mentioned transformation, when mud pit level rose, the liquid level front end of indicator significantly moved right.The amplitude that moves right is far longer than the amplitude that mud pit level rises, and therefore, when mud pit level has small rising, also can be measured comes out, and has effectively improved the sensitivity of monitoring.
According to relative theory, the ratio of the height Δ H that distance, delta L that indicator moves right and mud rise is:
In the formula: ρ
1-mud density, kg/m
3ρ
2-indicator density, kg/m
3d
1-cell diameter, mm; d
2-indicator tube diameter, mm.
Can find out that by following formula when in the mud pit during liquid level rising △ H, this liquid level difference will be amplified d in the reading tubule
1 2ρ
1/ d
2 2(ρ
1-ρ
2) doubly, amplification effect is rather good.
Mud pit liquid level change amplification method of the present invention can be adjusted to the best with the liquid level change multiplication factor through the adjustment of indicator density, to strengthen amplification effect.Mud pit liquid level change amplification method of the present invention can be widely used in oil and gas well drilling overflow monitoring field.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Mark among the figure: 1-mud pit; 2-mud; 3-filter screen; 4-valve; 5-mixing plant; 6-interface; 7-L shaped pipe; 8-indicator; 9-expansion chamber; 10-indicator front-end interface; 11-reading tubule; 12-flange.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is described further, but the present invention is not limited to following examples.
High accuracy overflow monitoring method of the present invention is as shown in Figure 1.Stretch out a L shaped pipe (7) from the side bottom of mud pit (1), there is expansion chamber (9) L shaped pipe (7) top, and reading tubule (11) is extended in the top seal of expansion chamber (9) from its right side.Liquid in expansion chamber (9) and reading tubule (11) is indicator (8), and indicator (8) density is slightly less than mud (2) density, and does not dissolve each other with mud (2) or react.In mud pit (1) and L shaped pipe (7) junction filter screen (3) and valve (4) are arranged, mixing plant (5) is arranged in L shaped pipe (7) vertical component bottom.
The effect of filter screen (3) is to prevent that the landwaste in the mud pit (1) from getting in the L shaped pipe (7), influences the amplification precision of L shaped pipe (7); The effect of valve (4) is when liquid level is low in the mud pit (1), can valve-off (4), prevent that indicator (8) gets in the mud pit (1) in the L shaped pipe (7); The effect of mixing plant (5) is to prevent that mud (2) in the L shaped pipe (7) is because the oversize and glued one-tenth piece of time of repose; Indicator front-end interface (10) is positioned at reading tubule (11), and its intensity of variation directly reacts the intensity of variation of mud pit (1) liquid level.
Among Fig. 1,,, can know that the distance that indicator front-end interface (10) moves is Δ Hd by law of connected vessels and hydrostatics principle (as above formula) as the liquid level rising Δ H of mud pit (1)
1 2ρ
1/ d
2 2(ρ
1-ρ
2), so just the liquid level change in the mud pit (1) has been amplified d
1 2ρ
1/ d
2 2(ρ
1-ρ
2) doubly.
If the diameter of reading tubule (11) and the diameter of expansion chamber (9) differ bigger, can make multiplication factor bigger in theory.In the practical application,, design reading tubule (11) diameter at the scene, can determine multiplication factor according to mud (2) character.If the diameter of expansion chamber (9) and the diameter of reading tubule (11) differ 5 times, mud (2) density and indicator (8) density are respectively 1.5 kg/m
3With 1.2 kg/m
3, the liquid level difference amplification multiple just is 125 times.That is: if mud pit (1) liquid level rising 1cm, the 125cm that moves right of the liquid in the reading tubule (11), monitoring effect is very obvious.
Claims (3)
1. one kind through mud pit being transformed the high accuracy overflow monitoring method that realizes that liquid level change is amplified, and comprises mud pit (1), L shaped pipe (7), filter screen (3), valve (4), mixing plant (5), indicator (8), expansion chamber (9), indicator front-end interface (10) and reading tubule (11); It is characterized in that: L shaped pipe (7) is drawn and is connected with flange (12) from mud pit (1) side bottom, be communicated with mud pit (1), and reading tubule (11) right part and atmosphere, and reading tubule (11) is answered horizontal positioned; Valve (4) is positioned at the position that L shaped pipe (7) lining is connected with mud pit (1), and its effect is when liquid level is low in the mud pit (1), can valve-off (4), prevent that indicator (8) gets into mud pit (1) in the L shaped pipe (7); Filter screen (3) is positioned at the position that L shaped pipe (7) lining is connected with mud pit (1), and is adjacent with valve (4) and more near mud pit (1), its effect is to prevent that the landwaste in the mud pit (71) from getting in the L shaped pipe (7); Mixing plant (5) is positioned at L shaped pipe (7) vertical component bottom, and its effect is to prevent that mud (2) in the L shaped pipe (7) is glued owing to leave standstill for a long time to become piece; The diameter of reading tubule (11) is (9) diameter much smaller than the expansion chamber.
2. high accuracy overflow monitoring method according to claim 1 is characterized in that: said indicator (8) density must be slightly less than mud (2) density in the mud pit (1), and is insoluble to mud (2).
3. according to the described high accuracy overflow of claim 1-2 monitoring method; It is characterized in that: when minor variations appears in the liquid level in the mud pit (1); The variation of indicator front-end interface (10) is amplified several times with the former in the reading tubule (11); Its multiplication factor was both relevant with the density contrast of mud (2) with indicator (8), also with the diameter of expansion chamber (9) and reading tubule (11) than relevant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210136984.7A CN102635321B (en) | 2012-05-07 | 2012-05-07 | High-precision overflow monitoring method during well-drilling process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210136984.7A CN102635321B (en) | 2012-05-07 | 2012-05-07 | High-precision overflow monitoring method during well-drilling process |
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| CN102635321A true CN102635321A (en) | 2012-08-15 |
| CN102635321B CN102635321B (en) | 2014-10-22 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104594834A (en) * | 2014-12-01 | 2015-05-06 | 中国石油大学(华东) | Method for monitoring drilling overflow condition of deepwater oil-based drilling fluid |
| CN105507886A (en) * | 2014-09-27 | 2016-04-20 | 中国石油化工集团公司 | Overflow and well leakage monitoring system and monitoring method thereof |
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| US4010012A (en) * | 1975-02-03 | 1977-03-01 | Dresser Industries, Inc. | Total gas containment system |
| US4342222A (en) * | 1979-03-27 | 1982-08-03 | Alekhin S | Method for the determination of depth of a fluid-saturated stratum and fluid type |
| CN1587634A (en) * | 2004-08-18 | 2005-03-02 | 中国石油天然气集团公司 | Compressed air circulation sand cleaning process and matching device |
| CN1773273A (en) * | 2005-11-11 | 2006-05-17 | 河北科技大学 | Testing apparatus for water anionics and producing method thereof |
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| CN101187297A (en) * | 2007-06-15 | 2008-05-28 | 辽河石油勘探局 | Closed sand-washing sand-removing oil-collecting technology for oil and water well, and device therefor |
| CN201180515Y (en) * | 2008-02-01 | 2009-01-14 | 滨州学院 | Automatic continuous grouting apparatus for pulling out of hole in oil field well drilling |
| CN102162342A (en) * | 2011-02-18 | 2011-08-24 | 濮阳市百福瑞德石油科技有限公司 | Communicating vessel-type qualitative monitoring method for well kick and lost circulation |
-
2012
- 2012-05-07 CN CN201210136984.7A patent/CN102635321B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4010012A (en) * | 1975-02-03 | 1977-03-01 | Dresser Industries, Inc. | Total gas containment system |
| US4342222A (en) * | 1979-03-27 | 1982-08-03 | Alekhin S | Method for the determination of depth of a fluid-saturated stratum and fluid type |
| CN1587634A (en) * | 2004-08-18 | 2005-03-02 | 中国石油天然气集团公司 | Compressed air circulation sand cleaning process and matching device |
| CN1773273A (en) * | 2005-11-11 | 2006-05-17 | 河北科技大学 | Testing apparatus for water anionics and producing method thereof |
| CN201037415Y (en) * | 2007-05-08 | 2008-03-19 | 大庆石油管理局 | Kick and circulation loss monitoring system |
| CN101187297A (en) * | 2007-06-15 | 2008-05-28 | 辽河石油勘探局 | Closed sand-washing sand-removing oil-collecting technology for oil and water well, and device therefor |
| CN201180515Y (en) * | 2008-02-01 | 2009-01-14 | 滨州学院 | Automatic continuous grouting apparatus for pulling out of hole in oil field well drilling |
| CN102162342A (en) * | 2011-02-18 | 2011-08-24 | 濮阳市百福瑞德石油科技有限公司 | Communicating vessel-type qualitative monitoring method for well kick and lost circulation |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105507886A (en) * | 2014-09-27 | 2016-04-20 | 中国石油化工集团公司 | Overflow and well leakage monitoring system and monitoring method thereof |
| CN105507886B (en) * | 2014-09-27 | 2018-08-10 | 中国石油化工集团公司 | A kind of overflow and leakage monitoring system and its monitoring method |
| CN104594834A (en) * | 2014-12-01 | 2015-05-06 | 中国石油大学(华东) | Method for monitoring drilling overflow condition of deepwater oil-based drilling fluid |
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| CN102635321B (en) | 2014-10-22 |
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