CN103256038A - Method for monitoring using condition of underground drill - Google Patents

Method for monitoring using condition of underground drill Download PDF

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CN103256038A
CN103256038A CN201210040812XA CN201210040812A CN103256038A CN 103256038 A CN103256038 A CN 103256038A CN 201210040812X A CN201210040812X A CN 201210040812XA CN 201210040812 A CN201210040812 A CN 201210040812A CN 103256038 A CN103256038 A CN 103256038A
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drill bit
torsion
moment
downhole drill
monitoring
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CN103256038B (en
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杨明清
陆黄生
张卫
李三国
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China Petroleum and Chemical Corp
Sinopec Research Institute of Petroleum Engineering
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China Petroleum and Chemical Corp
Sinopec Research Institute of Petroleum Engineering
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Abstract

The invention relates to a method for monitoring the using condition of an underground drill and belongs to the field of oil extraction. The method comprises step one, measuring a torque Wi of a drill pipe, wherein the i is the measurement ordinal, and the i=1, 2, 3...; step two, calculating an average torque of continuous n torque containing the current torque; step three, calculating a standard deviation sigma a of the n torque in the step two; step four, calculating a dispersion ka of the n torque in the step two and monitoring the using condition of the underground drill according to the change of the ka. By means of the method, the monitoring accuracy can be improved substantially, automatic monitoring can be achieved, the labor intensity can be reduced, and the application range is wide.

Description

The method of monitoring downhole drill bit behavior in service
Technical field
The present invention relates to a kind of method of monitoring the downhole drill bit behavior in service, by the dispersion of drilling rod moment of torsion is analyzed, monitor the behavior in service of downhole drill bit.
Background technology
Torque parameter is one of frequent parameter of measuring of situ of drilling well, and its variation can reflect the downhole drill bit behavior in service, so the drill-well operation personnel often rely on the variation of torque parameter to monitor the behavior in service of downhole drill bit.In general, when the torque ripple amplitude hour, the expression downhole drill bit is working properly; When the torque ripple amplitude was big, the expression downhole drill bit life-span was about to termination, if untimely more bit change drill bit will take place fall in the well, the situation that can't continue to creep into.The drill bit of falling in the well is salvaged out, can expend a large amount of financial resources, material resources, even may cause well to scrap, cause tremendous loss.
At present, the type of sensor of measuring moment of torsion has varied, and different wells is installed in different positions, for example is installed in diverse locations such as rotating disk, universal drive shaft, chain.The moment of torsion of measuring in diverse location is not of uniform size causing often, and the behavior in service that can only rely on the size dependence experience of variation tendency by moment of torsion and fluctuating range to monitor downhole drill bit can not realize automatic monitoring.For example, when moment of torsion has the trend of increase or fluctuation big, think that bit life is about to termination, or moment of torsion is arranged a high alarm setting, when moment of torsion exceeds this thresholding, think that namely bit life is about to termination, and do not have unified standard.
In the document of prior art, the aging relation that changes with moment of torsion or torque curve of downhole drill bit has been described.For example: the document of writing at Liu Jinhua " application of engineering parameter well logging in drilling engineering " (" fault-blcok oil-gas field ", 2003 the 10th the 5th phases of volume, the 87th page) in point out, when drill bit wears out, tooth wear is serious, it is big to be that so-called bit life termination generally shows as torque curve metamorphosis amplitude, and moment of torsion tracing pattern in one second is spindle and becomes big, accidental the pressure of the drill fluctuation.
Point out in the document of writing at Tao Zongpu, Deng Wenhui, Deng Weiping " standardization processing of engineering logging parameter " (" well logging technology ", 2000 the 11st the 3rd phases of volume, the 28th page), when the major parameter of judging the bit life termination is moment of torsion, rotary speed and brill.During unusual the generation, moment of torsion continuation or increase, or fluctuate widely suddenly or change frequency is exceedingly fast.
The document of writing at Yu Mingfa, Song Yuming, Liu Jinzhong, Pu Chunfa, Sun Yuhua, Zheng Zhixiang " the unusual prediction research of well logging field engineering " (" well logging technology ", 2000 the 11st the 3rd phases of volume, the 19th page) in point out, drill bit is the key tool that enforcement is crept into, the behavior in service of drill bit directly affects the progress of wellbore construction, under normal circumstances, and after drill bit uses certain hour, it is aging that drill bit is tending towards, and can't continue to bear the task of creeping into.Logging parameters has a series of variation, because the wearing and tearing of drill teeth, the breaking capacity of drill bit descends, and is slack-off during brill, and drilling cost begins to raise; The wearing and tearing of cone bit bearing are rotated dumbly, cause torque value display abnormality fluctuation.
Torque curve feature under different drill bit state has been described in the document " compound logging torque curve signature analysis and application " (" well logging technology ", the 12nd the 2nd phase of volume of calendar year 2001,23-28 page or leaf) that Yang Minghua writes.
In fact, when the downhole drill bit life-span was about to terminate, moment of torsion often increased not quite, and the amplitude of torque ripple often increases considerably, thereby the high alarm setting that moment of torsion only is set is easy to cause erroneous judgement, and can't realize automatic monitoring.
In addition, the open CN1512032A of Chinese patent and CN2595978Y disclose a kind of rock bit wear condition real-time monitoring system.In this system, by the vibration signal of collection drill string, and analyzed to judge the bit wear situation.This system only is applicable to rock bit, and is inapplicable to drag bit, PDC drill bit, and this system ratio of the spectrogram that records and standard spectrogram need being opposed, and can't realize automation.
Therefore, be badly in need of a kind of being widely used, can realize accurately, monitor automatically the method for downhole drill bit behavior in service.
Summary of the invention
At existing above-mentioned technical problem in the prior art, the present invention proposes a kind of method of monitoring the downhole drill bit behavior in service, it can realize monitoring accurately, automatically the downhole drill bit behavior in service by analyzing the moment of torsion of drilling rod.
According to the present invention, a kind of method of monitoring the downhole drill bit behavior in service has been proposed, it may further comprise the steps,
Step 1: the moment of torsion W that measures drilling rod i, wherein i is for measuring ordinal number, i=1,2,3...;
Step 2: the average torque that calculates continuous n the moment of torsion that comprises current torque
Figure BDA0000137096490000031
Step 3: the standard deviation sigma of the moment of torsion of the n described in the calculation procedure 2 a
Step 4: the dispersion k of the moment of torsion of the n described in the calculation procedure 2 a, wherein
Figure BDA0000137096490000032
According to k aThe behavior in service of change monitoring downhole drill bit.
The method according to this invention only needs to measure the moment of torsion of drilling rod.Therefore for existing drilling rig, do not need to increase new device and can use this method.And, the dispersion k of use moment of torsion aThe behavior in service that the behavior in service of monitoring downhole drill bit is monitored downhole drill bit than the variation of directly using moment of torsion is more accurate.In addition, according to dispersion k aThe behavior in service of monitoring downhole drill bit can realize automatic monitoring.
In one embodiment, in step 2, n is any one integer in 5 to 10.In a preferred embodiment, n equals 5.
According to the present invention, average torque described here
Figure BDA0000137096490000033
Be moment of torsion W iThe arithmetic mean value.In one embodiment, average torque
Figure BDA0000137096490000034
Computational methods be:
Figure BDA0000137096490000035
A=1 in the formula, 2,3....In another embodiment, standard deviation sigma aComputational methods be:
Figure BDA0000137096490000036
According to the present invention, whenever record a new moment of torsion, then calculate a new dispersion k aTherefore, along with constantly carrying out of measuring, can calculate series of discrete degree k a, according to dispersion k aMonitor the behavior in service of downhole drill bit.According to the present invention, when n is 5 to 10, particularly n equals at 5 o'clock, and monitoring effect is the most accurate.
In one embodiment, work as k a＞0.25 o'clock, the expression downhole drill bit life-span was about to termination.In a preferred embodiment, work as k a≤ 0.15 o'clock, the expression downhole drill bit was working properly; As 0.15＜k a≤ 0.25 o'clock, the behavior in service variation of expression downhole drill bit.
In one embodiment, described method also comprises step 5: the mean square that calculates continuous m the dispersion that comprises current dispersion
Figure BDA0000137096490000037
According to The behavior in service of change monitoring downhole drill bit.
In one embodiment, m is any one integer in 5 to 10.In a preferred embodiment, m equals 5.
According to the present invention, mean square described here
Figure BDA0000137096490000041
It is the arithmetic mean number.In one embodiment, mean square
Figure BDA0000137096490000042
Computational methods be:
Figure BDA0000137096490000043
B=1 in the formula, 2,3....
According to the present invention, whenever record a new moment of torsion, then calculate a new mean square
Figure BDA0000137096490000044
Therefore, along with constantly carrying out of measuring, can calculate a series of mean squares
Figure BDA0000137096490000045
According to mean square
Figure BDA0000137096490000046
When monitoring the behavior in service of downhole drill bit, owing to use
Figure BDA0000137096490000047
Monitoring can be got rid of use k aThe erroneous judgement point of monitoring, it is higher therefore to monitor accuracy.According to the present invention, when m is 5 to 10, particularly m equals at 5 o'clock, and monitoring effect is the most accurate.
In one embodiment, when
Figure BDA0000137096490000048
The time, the expression downhole drill bit life-span is about to termination, in a preferred embodiment, when
Figure BDA0000137096490000049
The time, the expression downhole drill bit is working properly; When
Figure BDA00001370964900000410
The time, the behavior in service variation of expression downhole drill bit.
In the present invention, term " current torque " refers to the moment of torsion that newly records.Term " downhole drill bit life-span be about to termination " refers to that the downhole drill bit loss is serious, reach must be immediately the degree of bit change more.Term " the behavior in service variation of downhole drill bit " refers to that downhole drill bit is lossy, but can also use, and needs to pay close attention to its behavior in service.
The invention has the advantages that, by the dispersion of using moment of torsion or the behavior in service that mean square is monitored downhole drill bit, can significantly improve the accuracy of monitoring, can also realize automatic monitoring, thereby significantly reduce labour intensity.In addition, the present invention only needs to measure the moment of torsion of drilling rod, need not increase extra device to existing apparatus, so applicable surface is wider.
Description of drawings
Come the present invention is described in further detail below in conjunction with accompanying drawing, wherein:
Fig. 1 is the flow chart of implementing method of the present invention;
Fig. 2 is the curve map according to the moment of torsion of first embodiment;
Fig. 3 is the curve map according to the dispersion of the moment of torsion of first embodiment;
Fig. 4 is the curve map according to the mean square of first embodiment;
Fig. 5 is the curve map according to the moment of torsion of second embodiment;
Fig. 6 is the curve map according to the dispersion of the moment of torsion of second embodiment;
Fig. 7 is the curve map according to the mean square of second embodiment.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing.
Fig. 1 is the flow process of implementing method of the present invention, may further comprise the steps:
Step 11: the moment of torsion W that measures drilling rod i, i is for measuring ordinal number, i=1,2,3...;
Step 12: the average torque that calculates continuous n the moment of torsion that comprises current torque
Figure BDA0000137096490000051
Wherein
Figure BDA0000137096490000052
A=1 in the formula, 2,3....Here, need selected specific n value, in one embodiment, n is any one integer in 5 to 10, is preferably 5;
Step 13: the standard deviation sigma of the moment of torsion of the n described in the calculation procedure 12 a, wherein σ a = 1 n Σ i = a n + a - 1 ( W i - W ‾ a ) 2 ;
Step 14: the dispersion k of the moment of torsion of the n described in the calculation procedure 12 a, wherein
Figure BDA0000137096490000054
According to k aVariation monitor the behavior in service of downhole drill bit.
In a preferred embodiment, also comprise step 15: the mean square that comprises continuous m dispersion of current dispersion
Figure BDA0000137096490000055
Wherein
Figure BDA0000137096490000056
B=1 in the formula, 2,3....According to
Figure BDA0000137096490000057
Variation monitor the behavior in service of downhole drill bit.Here, need selected specific m value, in one embodiment, m is any one integer in 5 to 10, is preferably 5.
Embodiment 1:
Choose the drilling well moment of torsion tables of data of T1 well, and according to method of the present invention data are handled, as table 1.In processing, n gets 5, m and also gets 5.
Draw according to the data in the table 1.Fig. 2 is the curve map of the moment of torsion of T1 well, and Fig. 3 is the curve map of dispersion of the moment of torsion of T1 well, and Fig. 4 is the curve map of the mean square of T1 well.
Embodiment 2:
Choose the drilling well moment of torsion tables of data of T2 well, and according to method of the present invention data are handled, as table 2.In processing, n gets 5, m and also gets 5.
Draw according to the data in the table 2.Fig. 5 is the curve map of the moment of torsion of T2 well, and Fig. 6 is the curve map of dispersion of the moment of torsion of T2 well, and Fig. 7 is the curve map of the mean square of T2 well.
Table 1
Figure BDA0000137096490000061
Figure BDA0000137096490000071
Table 2
Figure BDA0000137096490000091
Figure BDA0000137096490000101
According to the method for prior art, because the change in torque amplitude of T2 well is greater than the change in torque amplitude of T1 well, as the moment of torsion W in table 1 and the table 2 iAnd corresponding moment of torsion W iShown in the curve map (Fig. 2 and Fig. 5), the drill bit that then is judged as the T2 well than the drill bit of T1 well more near life termination.
But, use method of the present invention to moment of torsion W iAfter handling, find the dispersion k of the moment of torsion of T1 well aTotally greater than the dispersion k of the moment of torsion of 0.25, T2 well aLess than 0.25, as table 1, table 2 and Fig. 3, shown in Figure 6.And, the mean square of T1 well
Figure BDA0000137096490000102
Totally greater than the mean square of 0.25, T2 well
Figure BDA0000137096490000103
Less than 0.25, as table 1, table 2 and Fig. 4, shown in Figure 7.Therefore, the method according to this invention be judged as the T1 well is only arranged drill bit near life termination, and the drill bit of T2 well still can use.Through the checking that pulls out of hole, the employed bit cone of T1 well is loosening, if bit change more or else cause drill bit to fall into accident in the well probably, and the drill bit of T2 well is intact substantially, can also continue to use.Thus, the method according to this invention can improve the monitoring precision.
In addition, method of the present invention can be easily by computer realization automatic data collection, deal with data, output result with send warning, thereby realize monitoring automatically, significantly reduce labour intensity.
Though invention has been described with reference to preferred embodiment, without departing from the scope of the invention, can carry out various improvement to it.The present invention is not limited to disclosed embodiment in the literary composition, but comprises all technical schemes in the scope that falls into claim.

Claims (10)

1. method of monitoring the downhole drill bit behavior in service, this method may further comprise the steps:
Step 1: the moment of torsion W that measures drilling rod i, wherein i is for measuring ordinal number, i=1,2,3...;
Step 2: the average torque that calculates continuous n the moment of torsion that comprises current torque
Figure FDA0000137096480000011
Step 3: the standard deviation sigma of the moment of torsion of the n described in the calculation procedure 2 a
Step 4: the dispersion k of the moment of torsion of the n described in the calculation procedure 2 a, wherein According to k aThe behavior in service of change monitoring downhole drill bit.
2. method according to claim 1 is characterized in that, works as k a＞0.25 o'clock, the expression downhole drill bit life-span was about to termination.
3. method according to claim 2 is characterized in that, works as k a≤ 0.15 o'clock, the expression downhole drill bit was working properly, and as 0.15＜k a≤ 0.25 o'clock, the behavior in service variation of expression downhole drill bit.
4. method according to claim 1 is characterized in that, also comprises step 5: the mean square that calculates continuous m the dispersion that comprises current dispersion
Figure FDA0000137096480000013
According to
Figure FDA0000137096480000014
The behavior in service of change monitoring drill bit.
5. method according to claim 4 is characterized in that, when
Figure FDA0000137096480000015
The time, the expression downhole drill bit life-span is about to termination.
6. method according to claim 5 is characterized in that, when
Figure FDA0000137096480000016
The time, the expression downhole drill bit is working properly, when
Figure FDA0000137096480000017
The time, the behavior in service variation of expression downhole drill bit.
7. according to each described method in the claim 1 to 6, it is characterized in that in step 2, n is any one integer in 5 to 10.
8. method according to claim 7 is characterized in that, n equals 5.
9. according to each described method in the claim 4 to 6, it is characterized in that m is any one integer in 5 to 10.
10. method according to claim 9 is characterized in that, m equals 5.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111209685A (en) * 2020-01-15 2020-05-29 西安理工大学 Deep jointed rock RQD determination method based on while-drilling monitoring technology

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3703096A (en) * 1970-12-28 1972-11-21 Chevron Res Method of determining downhole occurrences in well drilling using rotary torque oscillation measurements
CN1114413A (en) * 1994-07-01 1996-01-03 西安石油学院 Torque measurer
CN1332878A (en) * 1998-11-19 2002-01-23 智能检测公司 Apparatus and method of well management
CN1512032A (en) * 2002-12-31 2004-07-14 石油大学(北京) Real-time monitoring method and syste mfor cone bit wear situation
CN1648408A (en) * 2004-09-20 2005-08-03 张复彦 Petroleum and natural gas drilling operation monitoring and controlling managing system
CN101263276A (en) * 2005-08-04 2008-09-10 普拉德研究及开发股份有限公司 Interface and method for wellbore telemetry system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3703096A (en) * 1970-12-28 1972-11-21 Chevron Res Method of determining downhole occurrences in well drilling using rotary torque oscillation measurements
CN1114413A (en) * 1994-07-01 1996-01-03 西安石油学院 Torque measurer
CN1332878A (en) * 1998-11-19 2002-01-23 智能检测公司 Apparatus and method of well management
CN1512032A (en) * 2002-12-31 2004-07-14 石油大学(北京) Real-time monitoring method and syste mfor cone bit wear situation
CN1648408A (en) * 2004-09-20 2005-08-03 张复彦 Petroleum and natural gas drilling operation monitoring and controlling managing system
CN101263276A (en) * 2005-08-04 2008-09-10 普拉德研究及开发股份有限公司 Interface and method for wellbore telemetry system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111209685A (en) * 2020-01-15 2020-05-29 西安理工大学 Deep jointed rock RQD determination method based on while-drilling monitoring technology
CN111209685B (en) * 2020-01-15 2024-03-26 西安理工大学 Deep jointed rock mass RQD determining method based on while-drilling monitoring technology

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