CN104713631A - Detecting method for average sound velocity inside oil well - Google Patents
Detecting method for average sound velocity inside oil well Download PDFInfo
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- CN104713631A CN104713631A CN201310686583.3A CN201310686583A CN104713631A CN 104713631 A CN104713631 A CN 104713631A CN 201310686583 A CN201310686583 A CN 201310686583A CN 104713631 A CN104713631 A CN 104713631A
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- average sound
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Abstract
The invention discloses a detecting method for an average sound velocity inside an oil well. The method comprises the following steps: sampling ranges are selected inside the oil well, and the average sound velocity inside each sampling range is detected, and the distance between a selected testing point and a datum point inside each sampling range is detected; two values which are relevant to the oil wall coefficient, the datum point temperature and the ground temperature coefficient are obtained through measuring and calculating; the distance between the datum point and the liquid level, and the distance between the datum point and the well opening are finally obtained; the two distances are added together and are divided by the liquid level echo time, and the average sound velocity inside the oil well can be output. By adopting the above technical scheme, the influence of the medium difference inside the oil well, the well opening temperature and the ground temperature variation coefficient can be effectively eliminated, the detecting method that the whole well average sound velocity is replaced by the partial average sound velocity is avoided, the detecting precision of the average sound velocity inside the oil well is maximally improved, the detecting accuracy of the liquid level depth of the oil well is further improved, and the method is suitable for popularization.
Description
Technical field
The present invention relates to oil well test technical field, particularly the detection method of bulk sound velocity in a kind of oil well.
Background technology
At present, echo method is usually adopted to measure oil-well level.The accuracy of detection of bulk sound velocity directly has influence on the accuracy of detection of level.Because oil well depth reaches hundreds of rice to a few km, all can there are great changes in borehole pressure, temperature, so the velocity of sound within the scope of full well also can exist great changes.The method that existing testing tool detects bulk sound velocity has two kinds: a kind of is detect that bulk sound velocity replaces full well bulk sound velocity according to the echo time of the phonetic symbol degree of depth and phonetic symbol reflection wave; Another kind be according to certain two joint hoops between Distance geometry these two joint hoop reflection wave between mistimings detect that between two joint hoops, bulk sound velocity replaces full well bulk sound velocity (affect by acoustic attenuation, all joints that can not record more than liquid level bind round ripples).The detection method of these two kinds of bulk sound velocities is all replace full well bulk sound velocity by the local average velocity of sound, and error is comparatively large, causes level accuracy in detection on the low side.
Summary of the invention
The technical problem to be solved in the present invention is: the detection method providing bulk sound velocity in oil well that a kind of error is less, to overcome the deficiencies in the prior art, and then improves the accuracy in detection of level.
The present invention is achieved in that it comprises the following steps:
A) first in oil well, choose the sampling interval being not less than two sections, and use liquid level test instrument conventionally detect every section of sampling interval bulk sound velocity C and from the test point chosen in every section of sampling interval (test point is the mid point of each sampling interval) to reference point (reference point can be chosen arbitrarily in oil well) distance L;
B) use the arithmetic element of liquid level test instrument according to formula
{ derivation of this formula is as follows: to the little amplitude acoustic wave in ideal gas, its velocity of sound meets formula C
2=K
1p, ideal gas meets again formula PV=K
2t, in formula: C is the velocity of sound, P is pressure, and T is absolute temperature, K
1, K
2for the constant relevant with gas, V is gas volume.For determining oil well, gas volume V is constant, and different depth K
1, K
2variable quantity can ignore, therefore can release formula C
2=K
1k
2t/V=K
at.K
arepresent the coefficient relevant to oil well.For determining oil well, the Changing Pattern of well temperature meets again ground temperature change formula T=T
0+ K
bl, in formula, T
0for reference point temperature, K
bfor ground temperature coefficient, L is the distance of test point apart from reference point, can release formula C
2=K
a(T
0+ K
bl) }, calculate and oil well COEFFICIENT K
a, reference point temperature T
0, ground temperature COEFFICIENT K
btwo relevant value K
at
0and K
ak
b;
C) use computing machine according to system of equations
(dt in this system of equations is the time interval of the sampling interval in test process) carries out computing, show that reference point is to the Distance geometry reference point of liquid level to the distance (data operation scope is the two-way time between well head ripple to liquid surface wave) of well head; Again two distances are added again divided by the time t of liquid level echo after (can obtain oil well depth), i.e. bulk sound velocity V in exportable oil well.
In above-mentioned oil well bulk sound velocity detection method in, the scope of every section of described sampling interval is the integral multiple of tubing length.
In aforesaid oil well bulk sound velocity detection method in, the spacing distance L between described sampling interval is not less than the length of five Oil-saving pipes.
Owing to have employed technique scheme, compared with the prior art, the present invention effectively can eliminate the impact of medium difference in oil well, wellhead temperature and ground temperature variation factor, avoid the detection method that the local average velocity of sound replaces full well bulk sound velocity, significantly improve the accuracy of detection of oil well bulk sound velocity, and then significantly improve the accuracy in detection of oil-well level, be suitable for promoting.In addition, be the integral multiple of tubing length by the range set of every section of sampling interval, be not only convenient to adopt existing liquid level test instrument to detect, the requirement of accuracy of detection can also be met simultaneously.Besides, through research and practice, the spacing distance between sampling interval is set as the length of ten Oil-saving pipes, every section of sampling interval velocity of sound can produce the change of about 1%, is convenient to detect and computing, can increases work efficiency further.
Embodiment:
Embodiments of the invention: (this is for two-way time for 12S to the liquid surface wave time with well head ripple, namely liquid level echo time t is 6S) oil well be example, choosing pithead position is reference point, choose the following first segment oil pipe of well head and the 11 Oil-saving pipe is sampling interval, each Oil-saving pipe length is 10m, for the ease of detecting and meeting the accuracy requirement detecting data, every section of sampling interval may be selected to be the length of an Oil-saving pipe, use existing commercially available liquid level test instrument, its sample frequency is set as 1MHz, the input precision of tubing length is set as 0.01m, and adopt conventional method (the described the second joint hoop method in such as background technology) to detect the bulk sound velocity C of every section of sampling interval, and from the test point chosen in every section of sampling interval to reference point distance L.The testing result obtained is: the bulk sound velocity of first segment oil pipe is 342.43m/S, and the bulk sound velocity of the 11 Oil-saving pipe is 344.18m/S; The test point of first segment oil pipe is 5m to the distance of reference point, and the test point of the 11 Oil-saving pipe is 105m to the distance of reference point.
Use the arithmetic element of existing commercially available liquid level test instrument according to formula
, calculate and oil well COEFFICIENT K
a, reference point temperature T
0, ground temperature COEFFICIENT K
btwo relevant value K
at
0and K
ak
b.The result calculated is: K
at
0value be 117198.226525, K
ak
bvalue be 12.015675.
Use computing machine according to system of equations
, carry out computing and show that reference point is to the Distance geometry reference point of liquid level to the distance (data operation scope is the two-way time between well head ripple to liquid surface wave, is 12S in the present embodiment) of well head, then two distances are added obtain and, its result is 2162.7m; Be finally 6S by this result divided by liquid level echo time t in liquid level echo time t(the present embodiment), i.e. bulk sound velocity V in exportable oil well, consequently: 360.45m/S.Closely, compared with the velocity of sound 342.43m/S traditionally tried to achieve or 344.18m/S, computational accuracy is largely increased the instantaneous velocity of sound of this result of calculation and oil well midpoint.
Embodiments of the present invention are not limited to above-described embodiment, and the various changes made under the prerequisite not departing from invention aim all belong to the protection domain of invention.
Claims (3)
1. the detection method of bulk sound velocity in oil well, is characterized in that: comprise the following steps:
A) first in oil well, choose the sampling interval being not less than two sections, and use liquid level test instrument conventionally detect every section of sampling interval bulk sound velocity (C) and from the test point chosen in every section of sampling interval to reference point distance (L);
B) use the arithmetic element of liquid level test instrument according to formula
, calculate and oil well coefficient (K
a), reference point temperature (T
0), ground temperature coefficient (K
b) relevant two value (K
at
0) and (K
ak
b);
C) use computing machine according to system of equations
Carry out computing, show that reference point is to the Distance geometry reference point of liquid level to the distance of well head; Again divided by the time (t) of liquid level echo after again two distances being added, i.e. bulk sound velocity (V) in exportable oil well.
2. the detection method of bulk sound velocity in oil well according to claim 1, is characterized in that: the scope of every section of described sampling interval is the integral multiple of tubing length.
3. the detection method of bulk sound velocity in oil well according to claim 1, is characterized in that: the spacing distance (L) between described sampling interval is not less than the length of five Oil-saving pipes.
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| CN104713631B CN104713631B (en) | 2018-01-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104963679A (en) * | 2015-07-24 | 2015-10-07 | 中国石油化工股份有限公司 | Pumping well static liquid level accurate calculating method |
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| US5996691A (en) * | 1996-10-25 | 1999-12-07 | Norris; Orley (Jay) | Control apparatus and method for controlling the rate of liquid removal from a gas or oil well with a progressive cavity pump |
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|---|---|---|---|---|
| CN104963679A (en) * | 2015-07-24 | 2015-10-07 | 中国石油化工股份有限公司 | Pumping well static liquid level accurate calculating method |
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| CN104713631B (en) | 2018-01-05 |
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