CN102635321B - 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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- CN102635321B CN102635321B CN201210136984.7A CN201210136984A CN102635321B CN 102635321 B CN102635321 B CN 102635321B CN 201210136984 A CN201210136984 A CN 201210136984A CN 102635321 B CN102635321 B CN 102635321B
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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, the method is that the amplification by mud pit liquid level is changed realizes the sensitivity monitoring to drilling well overflow, belongs to drilling well monitoring technical field.
Background technology
In drilling process, when boring chance down-hole high pressure layer and well liquid column pressure again lower than strata pressure, there will be drilling well overflow.Drilling well overflow constantly increases can form well kick, if take not in time treatment measures, well yield can progressively increase, and ejecta can get more and more, more spray is higher, and blowout finally occurs.Angle from drilling engineering, drilling well overflow is found more early better, particularly when creeping into high-pressure gas reservoir, in the process of returning toward well head from shaft bottom with mud at natural gas, pressure constantly reduces, and natural gas volume constantly expands, while more approaching well head, discharge mud amount just larger, just shorter from overflowing to time of blowout.
At present, the overflow monitoring method in domestic drilling engineering is mainly mud pit level monitoring and mud is imported and exported flow monitoring, and generally carries out artificial observation regularly, and records and contrasted.Mud pit level monitoring is the minimum and highly effective monitoring means of cost, but because the floor space of mud pit is very large, when the overflow initial stage, spillway discharge was less, the height that mud pit rises is very little, be difficult to monitor, cause the sensitivity of monitoring and the degree of accuracy to decline.Therefore, traditional mud pit level monitoring has certain limitation.The overflow how producing in sensitivity monitoring drilling well is also administered early, fundamentally stops the generation of blowout, becomes a difficult problem urgently to be resolved hurrily in current drilling engineering.
Summary of the invention
The object of the invention is to the problem for overflow monitoring exists in drilling engineering, a kind of overflow monitoring new method is proposed, the method is by carrying out to mud pit the amplification that certain transformation realizes mud pit level high variable quantity, then improve the precision of mud pit level monitoring, make drilling well overflow be able to more early find, thereby for post-processed wins more quality time, effectively solve a difficult problem for overflow monitoring in oilfield drilling.
Above-mentioned mud pit being carried out to certain transformation, is to stretch out a L shaped pipe from the side bottom of mud pit, and there is expansion chamber L shaped pipe top, and the top seal of expansion chamber, extends reading tubule from its right side, and 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, there are filter screen and valve, in L shaped pipe vertical component bottom, have mixing plant.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 entering mud pit.The effect of filter screen is to prevent that the landwaste in mud pit from entering in L shaped pipe, and its sizing grid should be less than the diameter of landwaste, and the material adopting should be by mud-corrosion.L shaped pipe should adopt the material that inner surface is smooth, prevents that mud is bonded at L pipe internal surface, 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 rises, the liquid level front end of indicator significantly moves right.The amplitude moving right is far longer than the amplitude that mud pit level rises, therefore, when mud pit level has small rising, also can be out measured, effectively improved the sensitivity of monitoring.
According to relative theory, the ratio of the height Δ H that the distance, delta L that indicator moves right and mud rise is:
In formula: ρ
1-mud density, kg/m
3; ρ
2-indicator density, kg/m
3; d
1-cell diameter, mm; d
2-indicator tube diameter, mm.
As can be seen from the above equation, in mud pit, during liquid level rising △ H, this liquid level difference will be amplified d in reading tubule
1 2ρ
1/ d
2 2(ρ
1-ρ
2) doubly, amplification effect is rather good.
Mud pit liquid level of the present invention changes amplification method, can liquid level be changed to multiplication factor and adjusted to the best by the adjustment of indicator density, to strengthen amplification effect.Mud pit liquid level of the present invention changes amplification method can be widely used in oil and gas well drilling overflow monitoring field.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Mark in 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 invention will be further described, but the present invention is not limited to following examples.
High accuracy overflow monitoring method of the present invention as shown in Figure 1.From the side bottom of mud pit (1), stretch out a L shaped pipe (7), there is expansion chamber (9) L shaped pipe (7) top, and the top seal of expansion chamber (9), extends reading tubule (11) 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 or react with mud (2).In mud pit (1) and L shaped pipe (7) junction, there are filter screen (3) and valve (4), in L shaped pipe (7) vertical component bottom, have mixing plant (5).
The effect of filter screen (3) is to prevent that the landwaste in mud pit (1) from entering in L shaped pipe (7), affects the amplification precision of L shaped pipe (7); The effect of valve (4) is when liquid level is lower in the mud pit (1), can valve-off (4), prevent that in L shaped pipe (7), indicator (8) enters in mud pit (1); The effect of mixing plant (5) is to prevent that the mud (2) in L shaped pipe (7) is cemented to piece because time of repose is oversize; 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.
In Fig. 1, as the liquid level rising Δ H of mud pit (1), by law of connected vessels and hydrostatics principle (as above formula), the mobile distance of known indicator front-end interface (10) is Δ Hd
1 2ρ
1/ d
2 2(ρ
1-ρ
2), so just the liquid level in mud pit (1) is changed and has amplified d
1 2ρ
1/ d
2 2(ρ
1-ρ
2) doubly.
If the diameter of the diameter of reading tubule (11) and expansion chamber (9) differs larger, can make in theory multiplication factor larger.In practical application, according to mud (2) character, design reading tubule (11) diameter at the scene, can determine multiplication factor.If the diameter of the diameter of expansion chamber (9) and reading tubule (11) differs 5 times, mud (2) density and indicator (8) density are respectively 1.5 kg/m
3with 1.2 kg/m
3, the multiple that liquid level difference is amplified is just 125 times.If i.e.: mud pit (1) liquid level rising 1cm, the 125cm that moves right of the liquid in reading tubule (11), monitoring effect is very obvious.
Claims (3)
1. by mud pit transformation being realized to liquid level, change the high accuracy overflow monitoring device amplifying, comprise 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 uses flange (12) to connect from mud pit (1) side bottom, be communicated with mud pit (1), L shaped pipe (7) upper end is connected with expansion chamber (9) bottom, the left part of reading tubule (11) is communicated with expansion chamber (9) right flank tip position, reading tubule (11) right part is communicated with atmosphere, and reading tubule (11) is answered horizontal positioned; Valve (4) is positioned at the inner position being connected with mud pit (1) of L shaped pipe (7), and its effect is when in mud pit (1), liquid level is lower, and valve-off (4), prevents that in L shaped pipe (7), indicator (8) enters mud pit (1); Filter screen (3) is positioned at the inner position being connected with mud pit (1) of L shaped pipe (7), and more close mud pit (1) adjacent with valve (4), and its effect is to prevent that the landwaste in mud pit (71) from entering in 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 L shaped pipe (7) is due to the long-time standing piece that is cemented to; The diameter of reading tubule (11) is (9) diameter much smaller than expansion chamber.
2. high accuracy overflow monitoring device according to claim 1, is characterized in that: described indicator (8) density must be slightly less than mud (2) density in mud pit (1), and is insoluble to mud (2).
3. high accuracy overflow monitoring device according to claim 1, it is characterized in that: when minor variations appears in the liquid level in mud pit (1), in reading tubule (11), the variation of indicator front-end interface (10) is amplified several times by the former, its multiplication factor is both relevant with the density contrast of mud (2) with indicator (8), Ye He expansion chamber (9) with the diameter of 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 |
Applications Claiming Priority (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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| Publication Number | Publication Date |
|---|---|
| CN102635321A CN102635321A (en) | 2012-08-15 |
| CN102635321B true CN102635321B (en) | 2014-10-22 |
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| CN201210136984.7A Expired - Fee Related CN102635321B (en) | 2012-05-07 | 2012-05-07 | High-precision overflow monitoring method during well-drilling process |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104594834B (en) * | 2014-12-01 | 2016-12-21 | 中国石油大学(华东) | A kind of monitoring method of deep water oil base drilling fluid drilling well flooded conditions |
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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 |
| 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 |
-
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 |
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| CN102635321A (en) | 2012-08-15 |
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