CN104713631A - Detecting method for average sound velocity inside oil well - Google Patents

Detecting method for average sound velocity inside oil well Download PDF

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CN104713631A
CN104713631A CN 201310686583 CN201310686583A CN104713631A CN 104713631 A CN104713631 A CN 104713631A CN 201310686583 CN201310686583 CN 201310686583 CN 201310686583 A CN201310686583 A CN 201310686583A CN 104713631 A CN104713631 A CN 104713631A
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well
sound velocity
sound
oil well
average sound
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CN 201310686583
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CN104713631B (en )
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庞云伟
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贵州航天凯山石油仪器有限公司
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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

一种油井内平均声速的检测方法 Method for detecting the average speed of sound in a hydrocarbon well

技术领域 FIELD

[0001] 本发明涉及油井测试技术领域,特别是一种油井内平均声速的检测方法。 [0001] The present invention relates to well testing technical field, particularly the method for detecting the average speed of sound in a hydrocarbon well.

背景技术 Background technique

[0002] 目前,通常采用回声法测量油井液面深度。 [0002] It is usually measured using the well fluid level echo method. 平均声速的检测精度直接影响到液面深度的检测精度。 Average speed of sound detection accuracy directly affects the accuracy of the detection of fluid levels. 由于油井深度达几百米至几千米,井内压力、温度都会存在很大变化,所以全井范围内的声速也会存在很大变化。 Since the well depth of several hundred meters to several kilometers, the well pressure, there will be a large temperature change, so that the speed of sound in the whole range of the well there will vary widely. 现有测试仪器检测平均声速的方法有两种:一种是根据音标深度和音标反射波的回波时间检测出平均声速来代替全井平均声速;另一种是根据某两个节箍之间的距离和这两个节箍反射波之间的时间差检测出两个节箍间平均声速代替全井平均声速(受声波衰减影响,不可能测得液面以上的所有节箍波)。 Existing testing equipment to detect the average speed of sound in two ways: one is detected according to the average speed of sound and depth echo time phonetic phonetic reflected wave instead of the whole well average speed of sound; the other is between two sections of a cuff according to the distance and the time difference between the two reflected wave detected cuff sections between two sections cuff average speed of sound instead of whole wells average speed of sound (sound attenuation by impact, measured over the liquid surface can not all sections cuff wave). 这两种平均声速的检测方法都是用局部平均声速代替全井平均声速,误差较大,导致液面深度检测准确度偏低。 The two detection methods are replaced by the average speed of sound the speed of sound in the whole well local mean average speed of sound, the error is larger, resulting in low accuracy of detecting fluid levels.

发明内容 SUMMARY

[0003] 本发明要解决的技术问题是:提供一种误差较小的油井内平均声速的检测方法, 以克服现有技术的不足,进而提高液面深度的检测准确度。 [0003] The present invention is to solve the technical problem are: to provide a method of detecting the average speed of sound of small wells error, to overcome the disadvantages of the prior art, thus improving the detection accuracy of the fluid level.

[0004] 本发明是这样实现的:它包括下列步骤: a) 先在油井里选取不小于两段的采样区间,并使用液面测试仪器按照常规方法检测出每段采样区间的平均声速C、以及从每段采样区间内选取的测试点(测试点即为每个采样区间的中点)到基准点(基准点可在油井内任意选取)之间的距离L; b) 使用液面测试仪器的运算单元根据公¥ [0004] The present invention is implemented as follows: it comprises the following steps: a) Select the first sampling period of not less than two stages in the well, testing equipment using the liquid level detected each segment sampling interval average speed of sound C in a conventional manner, and the distance L from the selected test point each segment sampling period (sampling test point is the midpoint of each section) to the reference point (reference point may be arbitrarily selected in the well) between; b) a test instrument using the liquid level the arithmetic unit is well ¥

Figure CN104713631AD00031

){此公式的推导过程如下:对理想气体中的小振幅声波,其声速满足公式C2=KiP,理想气体又满足公式PV=K2T,公式中:C为声速,P为压强,T为绝对温度,KpK2为与气体有关的常数,V为气体体积。 ) {Derivation of this equation is as follows: small amplitude sound waves in an ideal gas, the speed of sound satisfies the equation C2 = KiP, over the gas and satisfies the equation PV = K2T, the formula: C is sound velocity, P is the pressure, T is the absolute temperature , KpK2 associated with the gas constant, V is the volume of gas. 对确定油井而言,气体体积V为常量,且不同深度Ki,K2的变化量可以忽略,因此可以推出公式C2=K^T/VzK/T。 For the determination of the well, the gas volume V is constant, and the different depths of Ki, K2 negligible amount of change, it is possible to launch the formula C2 = K ^ T / VzK / T. &表示与油井相关的系数。 & Represents the coefficient associated with the well. 对于确定油井,井内温度的变化规律又符合地温变化公式TzI^+KbL,公式中,I;为基准点温度,KB为地温系数,L为测试点距基准点的距离,即可推出公式C2=KAa+KA)},测算出与油井系数KA、基准点温度I;、地温系数KB有关的两个值心!;和KAKB ; c) 使用计算机根据方程〗 For determining the well, variation of the well temperature but also with the temperature variation formula TzI ^ + KbL, formula, I; reference point temperature, KB is the temperature coefficient, L is a distance from the test point from the reference point to the introduction of formula C2 = KAa + KA)}, and the estimated coefficient wells KA, the reference point I ;, geothermal temperature coefficient KB values ​​related to two heart;! and KAKB; c) according to the equation using a computer〗

Figure CN104713631AD00032

(该方程组中的dt为测试过程中的采样区间的时间间隔)进行运算,得出基准点到液面的距离和基准点到井口的距离(数据运算范围为井口波到液面波之间的往返时间);再将两个距离相加(即可得到油井深度)后再除以液面回波的时间t,即可输出油井内平均声速V。 Level Wave between (dt in the equation for the time sampling interval during the test interval) calculates, derived from the reference point to the reference point from the liquid surface to the wellhead (wave data calculation range to the wellhead round-trip time); and then adding the two distances (the well depth can be obtained) and then divided by the level of the echo time t, the well can output an average acoustic velocity V.

[0005] 上述的油井内平均声速的检测方法中,所述的每段采样区间的范围是油管长度的整数倍。 [0005] The above-described method for detecting the average speed of sound in the well, each segment of the range of the sampling period is an integer multiple of the length of tubing.

[0006] 前述的油井内平均声速的检测方法中,所述的采样区间之间的间隔距离L不小于五节油管的长度。 [0006] The foregoing method for detecting the average speed of sound in the well, the distance L between the sampling period is not less than the length of the five sections of tubing.

[0007] 由于采用了上述技术方案,与现有技术比较,本发明能够有效消除油井内介质差异、井口温度和地温变化系数的影响,避免了局部平均声速代替全井平均声速的检测方法, 大幅提高了油井平均声速的检测精度,进而大幅提高了油井液面深度的检测准确度,适于推广。 [0007] By adopting the technical solution, and the prior art comparison, the present invention can effectively eliminate the medium differences in the well, it affects the wellhead temperature and temperature variation coefficient to avoid the detection method of the locally averaged speed of sound in place of the whole well average speed of sound, a substantial the detection accuracy of the average speed of sound well, thereby greatly improving the detection accuracy of the fluid level of the well, is adapted to promote. 另外,将每段采样区间的范围设定为油管长度的整数倍,不仅便于采用现有的液面测试仪器进行检测,同时还能满足检测精度的要求。 Further, the range of the sampling interval of each segment is set to an integral multiple of the length of the tubing, not only to facilitate the use of existing test equipment for testing the liquid surface while still meet the requirements of detection accuracy. 再就是,经过研究和实践,将采样区间之间的间隔距离设定为十节油管的长度,每段采样区间声速会产生1%左右的变化,便于检测及运算,能进一步提高工作效率。 Then, through research and practice, the separation distance between the sampling period is set to Section 30 of the tubing length, each sampling period will produce sound velocity change of about 1%, to facilitate the detection and calculation efficiency can be further improved.

[0008] [0008]

具体实施方式: 本发明的实施例:以井口波到液面波时间为12S(此为往返时间,即液面回波时间t为6S)的油井为例,选取井口位置为基准点,选取井口以下第一节油管和第^^一节油管为采样区间,每一节油管长度为10m,为了便于检测并满足检测数据的精度需求,每段采样区间可选择为一节油管的长度,使用现有市售的液面测试仪器,将其采样频率设定为1MHz,油管长度的输入精度设定为〇. 〇lm,并采用常规方法(例如背景技术中的所述的第二种节箍法)检测出每段采样区间的平均声速C、以及从每段采样区间内选取的测试点到基准点之间的距离L。 DETAILED DESCRIPTION: Embodiments of the present invention: the liquid surface to the wellhead wave 12S wave time (this is the round trip time, i.e., the level of the echo time t 6S) wells, for example, the position of the reference point selected wellhead, the wellhead selection the first tubing and the second tubing ^^ one sampling interval, each section of tubing length 10m, in order to facilitate the detection accuracy and to meet the needs of data detection, each sampling interval may be selected to a length of tubing, using the now the level of commercially available test instruments, which the sampling frequency is set to 1MHz, accuracy of the input tubing length is set to be square. 〇lm, and a conventional method (e.g., the background art section of the second cuff method the distance between the reference point) is detected in the average speed of sound sampling period per segment C, and the selected test point from each segment to the sampling interval L. 得到的检测结果是:第一节油管的平均声速为342. 43m/S,第十一节油管的平均声速为344. 18m/S ;第一节油管的测试点到基准点的距离为5m,第十一节油管的测试点到基准点的距离为105m。 Detection result is obtained: the average speed of sound of the first tubing 342. 43m / S, an average acoustic velocity of the tubing section XI 344. 18m / S; a first tubing test point to the reference point distance of 5m, section XI tubing test point to the reference point distance of 105m.

[0009] 使用现有市售的液面测试仪器的运算单元根据公5 [0009] The use of conventional commercially available liquid level measuring instrument operation unit according to the well 5

Figure CN104713631AD00041

,测算出与油井系数KA、基准点温度凡、地温系数KB有关的两个值K/I;和K AKB。 , With the estimated well coefficients KA, where the reference point temperature, the temperature coefficient KB values ​​related to two K / I; and K AKB. 测算出的结果是:KATQ 的值为117198. 226525、KAKB 的值为12. 015675。 The results of the calculation are: KATQ value 117198. 226525, KAKB value 12.015675.

[0010] 使用计算机根据方程; [0010] According to the equation using a computer;

Figure CN104713631AD00042

,进行运算得出基准点到液面的距离和基准点到井口的距离(数据运算范围为井口波到液面波之间的往返时间,本实施例中为12S),再将两个距离相加得到的和,其结果为2162. 7m;最后用该结果除以液面回波时间t(本实施例中液面回波时间t为6S),即可输出油井内平均声速V,其结果是:360.45m/ S。 , Calculates the reference point to obtain liquid distance from the reference point to the wellhead (wellhead data operation range wave to wave round trip time between the liquid surface, in this embodiment as 12S), then the two distances from the and adding the obtained result, it was 2162. 7m; finally dividing the result by the liquid level echo time t (in the present embodiment the liquid surface echo time t is 6S embodiment), the well can output an average acoustic velocity V, as a result is: 360.45m / S. 该计算结果与油井中点处的瞬时声速非常接近,与按传统方法求得的声速342. 43m/S或344. 18m/S相比,计算精度得到大幅提高。 The calculation result to the instantaneous speed of sound is very close to the midpoint of the wells, and the sound velocity determined by the conventional method 342. 43m / S or 344. 18m / S as compared to the calculation accuracy is greatly improved.

[0011] 本发明的实施方式不限于上述实施例,在不脱离发明宗旨的前提下做出的各种变化均属于发明的保护范围。 Embodiment [0011] The present invention is not limited to the above embodiments, various modifications made without departing from the gist of the invention belong to the scope of the invention.

Claims (3)

  1. 1. 一种油井内平均声速的检测方法,其特征在于:包括下列步骤: a) 先在油井里选取不小于两段的采样区间,并使用液面测试仪器按照常规方法检测出每段采样区间的平均声速(C)、以及从每段采样区间内选取的测试点到基准点之间的距离(L); b)使用液面测试仪器的运算单元根据公式G2 =KaCTci + KbL),测算出与油井系数(KA)、基准点温度(I;)、地温系数(Kb)有关的两个值(KaTci)和(KaKb); 1. A method for detecting the average speed of sound in the well, characterized by: comprising the steps of: a) selecting first oil wells in the sampling period of not less than two, and the test equipment using the liquid level detected by the sampling period of each segment in a conventional manner the average speed of sound (C), and selecting the sampling period of each segment from the test point to the distance between the reference point (L); b) the use of the liquid level measuring instrument operation unit according to the equation G2 = KaCTci + KbL), measure out oil well coefficient (KA), the temperature of the reference point (I;), the temperature coefficient (Kb) relating to two values ​​(KaTci) and (KaKb);
    Figure CN104713631AC00021
    进行运算,得出基准点到液面的距离和基准点到井口的距离;再将两个距离相加后再除以液面回波的时间(t),即可输出油井内平均声速(V)。 Calculates, to obtain the reference point and the reference liquid distance from the wellhead to the point; and then divided by two and then adding the liquid level from the echo time (T), the average speed of sound can be output (V the well ).
  2. 2. 根据权利要求1所述的油井内平均声速的检测方法,其特征在于:所述的每段采样区间的范围是油管长度的整数倍。 The method for detecting the average speed of sound of the well of claim 1, wherein: each piece of range of the sampling period is an integer multiple of the length of tubing.
  3. 3. 根据权利要求1所述的油井内平均声速的检测方法,其特征在于:所述的采样区间之间的间隔距离(L)不小于五节油管的长度。 The method for detecting the average speed of sound of the well to claim 1, wherein: the distance between the sampling period (L) is not less than the length of the five sections of tubing.
CN 201310686583 2013-12-16 2013-12-16 Method for detecting the average speed of sound in a hydrocarbon well CN104713631B (en)

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