CN1325902C - Ground vibration detecting method for casing damage - Google Patents

Abstract

The present invention relates to a ground vibration detecting method for casing tube damage. The ground vibration detecting method mainly solves the problems of incapability of random online detection, high labor intensity and high cost in the existing casing tube damage detection. The present invention is characterized in that a steady and clean plane on a well head (3) of an oil pumping well or a water injection well is selected for placing a sensor (2); a device (1) is connected with the sensor (2); a switch of the detecting instrument (1) and a computer connected with the switch are opened, and explanation software is started; a knocker (4) is used for knocking the frontal plane of a smooth part at the upper end of a casing tube to generate vibration waves; the computer receives the feedback time tt of the oscillatory waves passing through a casing damage point (6) and the feedback time t2 of the oscillatory waves passing through an artificial well bottom; the transmission speed V2 of the oscillatory waves in the casing tube is calculated according to the depth L2 of the artificial well bottom and the feedback time t2 of the artificial well bottom; the position Lt of the casing damage point (6) is calculated; the computer stores detection document results of the position Lt of the casing damage point (6). the present invention has the characteristics of timely and accurate online detection and simple operation, and reduces workers' labor intensity and production cost.

Description

A kind of sleeve pipe damages the ground vibration detection method

Technical field:

The present invention relates to the used cover in oil-field development field and decrease detection method, belong to a kind of sleeve pipe and damage the ground vibration detection method.

Background technology:

After a bite well has bored, sleeve pipe need be placed between the stratum, in oilfield development process, enter the mud stone layer owing to inject water, the mechanical property and the stress state of mud stone have been changed, thereby make mud stone produce displacement and distortion, extruding causes sleeve pipe to damage, along with damaging, is on the increase by sleeve pipe, the testing amount also constantly increases, it is what to carry out when the ordinary production of oil-water well is affected that conventional cover decreases test, its detection method has borehole wall ultrasonic imaging well logger, magnetic logger etc., under the situation of oil-water well ordinary production, because the instrument external diameter does not have test channel more in addition, or the influence that is subjected to tubular column structure can not be carried out the detection of online cover damage, can not be because of overlapping the detection of damage at any time, only after tripping out tubing string, job execution could enroll the Casing Failure interrelated data, in conjunction with other data sleeve pipe is made detecting simultaneously and estimate, for the Casing Failure reparation or take the measure of scrapping that foundation is provided, it is more a lot of time lag than true cover damage that detected cover decreases the time, testing result is untimely, these methods all need to stop oil-water well production, direct cost, trip out down-hole string, one time expense is at 3～40,000 yuan, add testing expense 5～60,000 yuan of every mouthful of well, use the downhole television testing expense up to tens0000 yuan, the production oil mass and the water injection rate indirect loss that influence in the operation trials process are bigger, particularly for well, if the sleeve pipe bad break also continue water filling, that just might be along the water filling in resinous shale of bad break mouth, causing underground formation large tracts of land immersion territory, and the expansion in immersion territory, is huge to the injury on stratum, can cause that again cover in blocks decreases, the economic loss that this chain reaction caused is immeasurable.

Summary of the invention:

Can not carry out online detection, labour intensity at any time when having detection cover damage now and reach the high deficiency of expense greatly in order to overcome, the invention provides a kind of sleeve pipe and damage the ground vibration detection method, this method need not play flowline just can detect the degree of depth and the position that the oil pipe cover decreases at any time, easy to detect, simple to operate, production cost is low.

The technical solution adopted for the present invention to solve the technical problems is: this sleeve pipe damages the ground vibration detection method, comprise rod-pumped well or water injection well, well head 3, oil pipe and sleeve pipe 5, the oil pipe that has well head 3 places in the sleeve pipe 5, selects cleaner plane to be used to place sensor 2 on rod-pumped well or water injection well well head 3; Instrument 1 is linked to each other with sensor 2; Open detecting instrument 1 switch and continuous computer thereof, start interpretation software; The horizontal frontal plane that knocks smooth place, sleeve pipe 5 upper ends with knocker 4 produces vibration wave, and computer receives the feedback time t of vibration wave after cover decreases point 6 and artificial bottom of a well ₁And t ₂Degree of depth L according to the artificial bottom of a well ₂And the feedback time t of artificial bottom of a well ₂Calculate the transmission speed V of vibration wave in sleeve pipe ₂, calculate cover again and decrease point 6 position L ₁Computer will overlap and decrease some position L ₁Detection record result preserve.

The above-mentioned well head that knocks is that elasticity is knocked; The horizontal frontal plane that knocks smooth place, sleeve pipe 5 upper ends can substitute with the side.

The invention has the beneficial effects as follows, owing to adopted sleeve pipe to damage the ground vibration detection method, need only knock the generation accumulation signal at well head, in sleeve pipe, propagate and feed back to the frequency or the changes in amplitude on ground and feed back to time on ground according to ripple according to the exciting ripple, judge that sleeve pipe damages or the position of distortion, test duration is generally less than 30 minutes, in interpretation software, preserve a large amount of standard spectrum curves, the curve that on-the-spot test goes out is understood automatically and typical curve compares, error identifying, thereby the cover that analyzes this well decreases the degree of depth, need not play flowline and can detect the situation that cover decreases at any time, have and onlinely to detect, in time, accurately reach characteristics simple to operate, reduced working strength of workers and production cost.

Description of drawings:

Fig. 1 is a structural representation of the present invention;

Fig. 2,3, the 4th, the present invention specifically implement curve map.

1-testing tool among Fig. 1, the 2-sensor, the 3-well head, the 4-knocker, the 5-sleeve pipe, the 6-cover decreases point.

T among Fig. 2,3,4 ₀-vibration wave send a time, t ₁-cover change the time, t ₂The time of-artificial bottom of a well.

Embodiment:

Below in conjunction with the drawings and specific embodiments will the invention will be further described:

A kind of sleeve pipe damages the ground vibration detection method, for rod-pumped well that will detect and water injection well, at first selects steadily clean plane of a comparison on rod-pumped well and water injection well well head 3, sensor 2 is placed the place, plane of well head 3 again; Be used to receive the feedback of ripple, detecting instrument 1 links to each other with sensor 2; At this moment just can open detecting instrument 1 switch, open notebook computer, start interpretation software, after preliminary work is carried out, knock the horizontal frontal plane or the side of sleeve pipe 5 upper ends, also can knock the casing flange that links to each other with sleeve pipe 5 upper ends and the smooth place of well head 3 and can receive same effect with knocker 4; When knocking in order to receive measurement effect preferably, must note reaching elasticity knocks as far as possible, sensor 2 fed back sleeve pipe 5 testing results, judge with interpretation software by computer this moment, in sleeve pipe 5, propagate and feed back to the frequency or the changes in amplitude on ground and feed back to time on ground according to ripple according to the exciting ripple, can judge the position that cover decreases point 6 on the sleeve pipe 5, promptly interpretation software is according to the degree of depth L of artificial bottom of a well ₂And ripple is to the feedback time t of artificial bottom of a well ₂Calculate the biography wave velocity V of vibration wave in sleeve pipe 5 ₂, can calculate cover damage point 6 position L according to cover damage feedback time and velocity of wave again ₁Test duration is generally less than 30 minutes, in interpretation software, preserve a large amount of standard spectrum curves, the curve that on-the-spot test goes out is understood automatically and typical curve compares, error identifying, thereby the cover that analyzes this well decreases the degree of depth, detect the switch and the computer that after finishing sonic sensor 2 and well head 3 are disconnected, close detecting instrument 1, the detection of end process.

Embodiment 1, use this method Bei3-2-045Jing is made detection curve as shown in Figure 2, the signal that receives according to sensor is reflected to sees t on the detecting instrument ₁Point decreases point 6 for cover, and the beginning test duration is t ₀, the time that cover decreases point 6 is fed back to t ₁=390.6ms, wave form varies spike occurs on the less curve of fluctuation, illustrate that cover occurring becomes; Knock wave is reflected back ground at the bottom of sleeve pipe: time t ₂=488.3ms is at t ₂The sudden change of some waveform, horizontal elongation, illustrate knock wave to the shaft bottom, the artificial bottom of a well this moment: L ₂=1253.3m is according to t ₂=488.3ms, L ₂=1253.3m, sleeve pipe velocity of wave: V ₂=2 * 1253.3/488.3=5133.32m/s; The cover displacement is put: t ₁=390.6ms, V ₂=5133.32m/s, then ${\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="C0312875900071.png"\; state="\{\{state\}\}">L</figure-callout>}}_1=\frac{390.6\&times;5133.32}{2}=1002.54m;$ And true cover damage point is 1000m, and error is 2.54m, within acceptance index coverage error rate allows less than 15%.

Embodiment 2, use this method Bei1-61-548Jing is made detection curve as shown in Figure 3, the signal that receives according to sensor is reflected to sees t on the detecting instrument ₁Point decreases point 6 for cover, and the beginning test duration is t ₀, the time that cover decreases point 6 is fed back to t ₁=282.88ms, the waveform sudden change is transversely elongated, and illustrates that cover occurring becomes; Knock wave is reflected back ground at the bottom of sleeve pipe: time t ₂=402.33ms is at t ₂The sudden change of some waveform is laterally upwards elongated, and illustrate knock wave to the shaft bottom, artificial bottom of a well L this moment ₂=1052m is according to t ₂=402.33ms, L ₂=1052m, sleeve pipe velocity of wave: V ₂=2 * 1052/402.33=5229.53m/s, the cover displacement is put: L ₁=t ₁* V ₂/ 2=282.88 * 5.2295/2m=739m, and true cover damage point is 741.89m, error is 2.23m, within acceptance index coverage error rate allows less than 15%.

Embodiment 3, use this method to northern 1-7-more the third 037 wells make detection curve as shown in Figure 4, the signal that receives according to sensor is reflected to sees t on the detecting instrument ₁Point decreases point 6 for cover, and the beginning test duration is t ₀, the time that cover decreases point 6 is fed back to t ₁=293ms, the deformation position reflection though the waveform sudden change is not obvious, can be found out to have and transversely elongate product trend, illustrates that cover occurring becomes; Knock wave is reflected back ground at the bottom of sleeve pipe: time t ₂=415.22ms is at t ₂The sudden change of some waveform, horizontal elongation, illustrate knock wave to the shaft bottom, the artificial bottom of a well this moment:

L ₂=1053.1m is according to t ₂=415.22ms, L ₂=1053.1m,

Sleeve pipe velocity of wave: V ₂=2 * 1053.1/415.22=5072.49m/s,

The cover displacement is put: L ₁=5.0725 * 293/2=743.19m, and true cover damage point is 743.96m, error is 0.77m, within acceptance index coverage error rate allows less than 15%.

In actual the use, because this method can detect at any time to rod-pumped well and water injection well, whether existence to the sleeve pipe bad break, the test accuracy rate is greater than 90%, and sleeve pipe bad break position measurement error is less than 15%, and display interface is clear, easy, curve is easy to identification, online detection bad break position, diagnostic detection system operation safe ready, maximum range is 1500m, temperature-5～+ 40 degree, humidity range 0-90%.Need not play flowline and can detect the situation that cover decreases at any time, have easy to detect, timely, accurately reach characteristics simple to operate, reduced working strength of workers and production cost, be worthy of popularization.

Claims (3)

1, a kind of sleeve pipe damages the ground vibration detection method, is used for comprising the oil field equipment of rod-pumped well or water injection well, well head (3), oil pipe and sleeve pipe (5), and the oil pipe that has well head (3) places in the sleeve pipe (5), it is characterized in that:

A, go up at rod-pumped well or water injection well well head (3) and to select cleaner plane to be used to place sensor (2);

B, instrument (1) is linked to each other with sensor (2);

C, open detecting instrument (1) switch and continuous computer thereof, start interpretation software;

D, the horizontal frontal plane that knocks smooth place, sleeve pipe (5) upper end with knocker (4) produce vibration wave, and computer receives the feedback time t of vibration wave after cover decreases point (6) and artificial bottom of a well ₁And t ₂Degree of depth L according to the artificial bottom of a well ₂And the feedback time t of artificial bottom of a well ₂Calculate the transmission speed V of vibration wave in sleeve pipe ₂, calculate cover again and decrease point (6) position L ₁

E, computer will overlap and decrease point (6) position L ₁Detection record result preserve.

2, a kind of sleeve pipe according to claim 1 damages the ground vibration detection method, it is characterized in that: knock well head (3) and knock for elasticity.

3, a kind of sleeve pipe according to claim 1 damages the ground vibration detection method, it is characterized in that: the horizontal frontal plane at smooth place, sleeve pipe (5) upper end can substitute with the side.

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