CN104763409A - Device and method for measuring underground flow rate of petroleum well - Google Patents

Abstract

The invention discloses a device and a method for measuring underground flow rate of a petroleum well. The device comprises a ground logging truck, and an instrument string which is connected through a cable and arranged in a sleeved oil pipe of an underground sleeve, wherein the instrument string comprises a halter, a first centering device, a magnetic positioning shot, a second centering device, a pressure difference density meter, a flow logger, a third centering device and a plug; a circuit system control motor or a hydraulic driving arm is mounted on the flow logger; static pressure sampling openings are respectively formed in the control motor or the hydraulic driving arm and the pressure difference density meter; the control motor or the hydraulic driving arm is opened or closed to measure underground flow rate of the petroleum well. According to the device, minimum annular section area between the arm and the sleeve is adjusted through the flow logger, so that the flow logger can be adapted to oil wells with various size and aperture; the construction processes are decreased; the working cost is saved; the working hours are reduced; the flow logger is applied to measuring of flow rate of a vertical shaft and a large-inclination-degree well, and the measuring precision is high.

Description

A kind of oil well down-off measurement mechanism and measuring method

Technical field

The invention belongs to petroleum industry measurement technology class, it is specifically related to a kind of oil well down-off measurement mechanism and measuring method, and a kind of oil well down-off measuring method involved in the present invention and device are specially adapted to vertical shaft and high angle hole.

Background technology

Along with the high speed development of petroleum industry, the management of the development and production in oil field gradually to intelligent management development, and obtain the wide promotion and application sent out.Downhole flow control technology is the indispensable pith of oilfield technology, and it mainly by transferring flow control valve to fulfil assignment in oil well.

Conventional oil well yield measuring device mainly contains packer flowmeter, turbine flowmeter etc.Its main operational principle is, at turbine wheel shaft, sensor is housed, and carries out by the metering turbine rotation number of turns mode flow-measuring method measuring well liquid in oil well.This flowmeter technology relative maturity, measuring accuracy is higher, but its major defect is that duty cycle is long, and auxiliary equipment is complicated, investment is large, and being subject to oil well hole condition affects certainty of measurement.And be applicable to single well flow and measure, when many wells transition measurement, reducing casing tube well measurements, then exist obviously not enough, and need the long period just can reach stable to measure.

Downhole flow control technology mainly solves the problem to the Real-time Collection of downhole flow data, monitoring and process in oil development, thus reaches Modify rapidly oil production technology, optimizes the output of payzone, improves the object of recovery ratio.Existing equipment and technology can't meet the needs of actual production.

Summary of the invention

For overcoming the deficiencies in the prior art part, the object of this invention is to provide a kind of downhole flow measurement method, and profit produced flow measurement device---traffic logger in this way, it has that structure is simple, working range is wide, certainty of measurement is high, stable performance, can Real-time Collection downhole flow data, can realize fixing a point, the feature of continuous measurement.

According to as above conceiving, the present invention realizes above-mentioned purpose by the following technical solutions.

A kind of oil well down-off measurement mechanism, comprise ground logging truck, and by the instrument string be located in down-hole casing socket oil pipe that cable is connected, described instrument string comprises the halter, centralizer, magnetic orientation pipe nipple, centralizer, pressure reduction Density Measuring Instrument, traffic logger, centralizer and the plug that connect successively from top to bottom and realizes carrying construction operation;

Described traffic logger controls motor or hydraulic-driven arm built with Circuits System, control to be respectively equipped with static pressure thief hatch in motor or hydraulic-driven arm and pressure reduction Density Measuring Instrument, control motor or hydraulic-driven arm open or closed action, realize oil downhole flow measurement.

Further, described instrument string comprises the halter, centralizer, magnetic orientation pipe nipple, centralizer, traffic logger, pressure reduction Density Measuring Instrument, centralizer and the plug that connect successively from top to bottom and realizes transferring construction operation.

Further, described instrument string comprises the halter, centralizer, magnetic orientation pipe nipple, centralizer, traffic logger, centralizer and the plug that connect successively from top to bottom and realizes flushing construction operation.

Further, P is provided with in the middle part of the control motor in described traffic logger or hydraulic-driven arm ₄static pressure thief hatch B, P ₄static pressure thief hatch B is arranged on the minimum place of annular cross-sectional area between sleeve pipe and control motor or hydraulic-driven arm external diameter; The two ends up and down of described control motor or hydraulic-driven arm are symmetrically arranged with P ₃static pressure thief hatch C and P ₅static pressure thief hatch A.

Further, described symmetrically arranged P ₃static pressure thief hatch C and P ₅static pressure thief hatch A is relative to controlling the upper and lower side of motor or hydraulic-driven arm apart from equal and equidirectional layout.

Further, described traffic logger upper end connects pressure reduction Density Measuring Instrument, and the certain altitude difference Δ h place on pressure reduction Density Measuring Instrument is respectively arranged with P ₁static pressure sample tap E and P ₂static pressure sample tap D, measures the density p at well depth H place; Wherein Δ h ≠ 0.

Correspondingly, The present invention gives a kind of oil well down-off measuring method based on said apparatus, comprise the steps:

1) the ground logging truck of instrument string sends instructions to control motor in traffic logger or hydraulic-driven arm expansion action to setting size by cable;

2) control motor or form minimum circular passage between hydraulic-driven arm and sleeve pipe, its smallest cross-sectional is S;

3) when described instrument string is in well H depths, when well liquid is by minimum circular passage, the flowing velocity of well liquid can be caused by V _obe increased to V; Meanwhile, the static pressure of well liquid is by P ₃be reduced to P ₄, and P ₄the force samples mouth of static pressure thief hatch B point is at smallest cross-sectional S place, minimum circular passage; If when instrument string being carried logging operation, the flow direction of well liquid flows from the bottom to top, instrument at the uniform velocity on propose motion, obtain:

P ₃>P ₄①

S ₀>S ②

V ₀<V ③；

Wherein, S ₀for the annular cross-sectional area on traffic logger between C point and sleeve pipe; S is P ₄annular cross-sectional area between static pressure thief hatch B point and sleeve pipe; V ₀for during by C point, the flowing velocity of well liquid; When V is by B point, the flowing velocity of well liquid;

4) pressure reduction Density Measuring Instrument records density p, if P at the section at well depth H place ₁static pressure thief hatch E and P ₂the static pressure difference Δ P=P of static pressure thief hatch D point pressure thief hatch ₂-P ₁, then:

$\mathrm{\&rho;}=\frac{P_2-P_1}{\mathrm{\&Delta;h}\&times;g}=\frac{\mathrm{\&Delta;P}}{\mathrm{\&Delta;h}\&times;g}$ ④

Wherein: P ₁, P ₂that pressure reduction Density Measuring Instrument is at well depth H place P respectively with Δ h ₁static pressure thief hatch E and P ₂the static pressure of the force samples mouth of static pressure thief hatch D point and difference in height, g is weight acceleration; ρ is the density at well depth H place;

5) as the control motor in traffic logger or hydraulic-driven arm minimum ring tee section P ₄static pressure thief hatch B point when moving to well depth H section, now, is Q by the flow of this section well liquid, then

Q＝S ₀×V ₀＝S×V ⑤

$P_3-P_4=\frac{\mathrm{\&rho;}}{2}(V^2-V_0^2)$ ⑥

Wherein: P ₄, P ₃be respectively traffic logger when well depth H place, P ₄static pressure thief hatch B and P ₃the static pressure of the force samples mouth of static pressure thief hatch C point; S ₀, V ₀be respectively traffic logger when well depth H place, P ₃the ring section sum well liquid flowing velocity of static pressure thief hatch C point; S, V be respectively traffic logger when well depth H place, P ₄the ring section sum well liquid flowing velocity of static pressure thief hatch B point;

6) 5. formula is 6. substituted into by above-mentioned:

$Q=S_0\sqrt{\frac{2(P_3-P_4)}{\mathrm{\&rho;}({\left(\frac{S_0}{S}\right)}^2-1)}}=S\sqrt{\frac{2(P_3-P_4)}{\mathrm{\&rho;}(1-{\left(\frac{S}{S_0}\right)}^2)}}$ ⑦

7) 4. substitute into 7. formula by above-mentioned, traffic logger is drawing at well depth H place, the well flow quantity Q value recorded:

$Q=S_0\sqrt{\frac{2\mathrm{\&Delta;h}(P_3-P_4)g}{\mathrm{\&Delta;P}({\left(\frac{S_0}{S}\right)}^2-1)}}=S\sqrt{\frac{2\mathrm{\&Delta;h}(P_3-P_4)g}{\mathrm{\&Delta;P}(1-{\left(\frac{S}{S_0}\right)}^2)}}$ ⑧。

Further, when carrying construction operation on described, traffic logger is positioned at below pressure reduction Density Measuring Instrument, measures at well depth H place P ₃static pressure thief hatch C, P ₄static pressure thief hatch B, P ₂static pressure thief hatch D and P ₁the static pressure at static pressure thief hatch E place.

Further, described in when transferring construction operation, traffic logger is positioned at above pressure reduction Density Measuring Instrument, measures at well depth H place P ₅static pressure thief hatch A, P ₄static pressure thief hatch B, P ₂static pressure thief hatch D and P ₁the static pressure at static pressure thief hatch E place;

When transferring construction operation, the well flow quantity Q value obtained:

$Q=S_0\sqrt{\frac{2\mathrm{\&Delta;h}(P_5-P_4)g}{\mathrm{\&Delta;P}({\left(\frac{S_0}{S}\right)}^2-1)}}=S\sqrt{\frac{2\mathrm{\&Delta;h}(P_5-P_4)g}{\mathrm{\&Delta;P}(1-{\left(\frac{S}{S_0}\right)}^2)}}.$

Further, during described water flooding construction operation, traffic logger is measured at well depth H place P ₃static pressure thief hatch C and P ₄the static pressure at static pressure thief hatch B place, wherein, P ₃the well flow quantity Q value that the measurement of the static pressure at static pressure thief hatch C place obtains:

$Q=S_0\sqrt{\frac{2\mathrm{\&Delta;h}(P_3-P_4)g}{\mathrm{\&Delta;P}({\left(\frac{S_0}{S}\right)}^2-1)}}=S\sqrt{\frac{2\mathrm{\&Delta;h}(P_3-P_4)g}{\mathrm{\&Delta;P}(1-{\left(\frac{S}{S_0}\right)}^2)}}.$

Owing to have employed technique scheme, compared with prior art, the present invention has the following advantages:

1, the arm of traffic logger is that the mode adopting Circuits System to control motor/hydraulic pressure drives, and carries out the minimum annular cross-sectional area between regulating arm and sleeve pipe, makes the oil well of the suitable for multiple sizes bore of traffic logger.

2, the arm of traffic logger can be closed to instrument maximum outside diameter size, is without lifting flowline, directly traffic logger can be transferred to position to be measured and measure.Decrease construction technological process, saved operating cost greatly and shortened the activity duration.

3, form annular overflow section between traffic logger and oil well casing and amass S, can carry out latus rectum/reducing casing tube oil well continuous/one-point measurement.

4, this traffic logger is applicable to vertical shaft and high angle hole flow measurement.

5, this traffic logger certainty of measurement is high.

Accompanying drawing explanation

Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a application's part, does not form inappropriate limitation of the present invention, in the accompanying drawings:

Accompanying drawing 1 is for the present invention is by operation schematic diagram during oil pipe.

Accompanying drawing 2 is construction operation schematic diagram when the present invention carries in oil well well logging.

Accompanying drawing 3 for the present invention is by after oil pipe, at the n-n sectional schematic diagram of Fig. 2.

Accompanying drawing 4 is after the control motor of inventive flow logging instrument or hydraulic-driven arm open certain size, at the m-m sectional schematic diagram of Fig. 2.

Accompanying drawing 5 is the present invention's construction operation schematic diagram when oil well well logging is transferred.

Accompanying drawing 6 is the construction operation schematic diagram of flushing measurement injection flow of the present invention.

In figure: 1, plug; 2, centralizer; 3, traffic logger; 4, pressure reduction Density Measuring Instrument; 5, magnetic orientation pipe nipple; 6, halter; 7, cable; 8, oil pipe; 9, sleeve pipe; 10, ground logging truck; 11, motor or hydraulic-driven arm is controlled; A, P ₅static pressure thief hatch; B, P ₄static pressure thief hatch; C, P ₃static pressure thief hatch; D, P ₂static pressure thief hatch; E, P ₁static pressure thief hatch; S ₀, annular cross-sectional area on traffic logger between A/C point and sleeve pipe; V ₀, by A/C point time, the flowing velocity of well liquid; P ₅/ P ₃, by A/C point time, the static pressure of well liquid; S, P ₄annular cross-sectional area between static pressure thief hatch B point and sleeve pipe; V, by B point time, the flowing velocity of well liquid; P ₄, by B point time, the static pressure of well liquid.

Detailed description of the invention

Describe the present invention in detail below in conjunction with accompanying drawing and specific embodiment, be used for explaining the present invention in this illustrative examples of the present invention and explanation, but not as a limitation of the invention.

Shown in accompanying drawings 1, a kind of oil well down-off of the present invention measurement mechanism, comprise ground logging truck 10, and be socketed instrument string in oil pipe 8 by the down-hole casing 9 of being located at that cable 7 is connected, on when carrying construction operation, instrument string comprises the halter 6, centralizer 2, magnetic orientation pipe nipple 5, centralizer 2, pressure reduction Density Measuring Instrument 4, traffic logger 3, centralizer 2 and the plug 1 that connect successively from top to bottom, and construction operation is carried in realization;

Traffic logger 3 controls motor or hydraulic-driven arm 11 built with Circuits System, control to be respectively equipped with static pressure thief hatch in motor or hydraulic-driven arm 11 and pressure reduction Density Measuring Instrument 4, control motor or hydraulic-driven arm 11 open or closed action, realize oil downhole flow measurement.

Oil well down-off measurement mechanism of the present invention, comprises traffic logger 3, and traffic logger 3 controls motor built with Circuits System or hydraulic-driven arm 11 realizes opening or closed action.The control motor of described traffic logger 3 or form annular overflow section between hydraulic-driven arm 11 and oil well casing to be measured 9 and amass S, the size of its annular cross-sectional area S can be regulated by the built-in control motor of traffic logger 3 or hydraulic-driven arm 11, and control motor or hydraulic-driven arm 11 middle are provided with P ₄static pressure thief hatch B, i.e. P ₄static pressure thief hatch B is arranged on the minimum place of annular cross-sectional area (S), and the two ends controlling motor or hydraulic-driven arm 11 are equal and equidirectional position is provided with P ₃static pressure thief hatch C and P ₅static pressure thief hatch A.

Described traffic logger 3 upper end connects pressure reduction Density Measuring Instrument 4, and the certain altitude difference Δ h place on pressure reduction Density Measuring Instrument 4 is respectively arranged with P ₁static pressure thief hatch E and P ₂static pressure thief hatch D, wherein Δ h ≠ 0.Measure the density p at well depth H place.

The instrument string using the produced flow measurement device-traffic logger 3 of the present invention to connect leads to operation through tubing.Ground logging truck 10 and halter 6 are coupled together with cable 7, conveying instrument string, in oil well to be measured, is all threaded connection between halter 6, centralizer 2, magnetic orientation pipe nipple 5, pressure reduction Density Measuring Instrument 4, traffic logger 3, plug 1.When operation through tubing, control motor or the hydraulic-driven arm 11 of traffic logger 3 are closed to instrument maximum outside diameter, entered in sleeve pipe smoothly carry out logging operation by oil pipe.Wherein, centralizer 2 adopts roller type to help instrument string placed in the middle in oil pipe/sleeve pipe, and can even running in oil well.The depth of falling well of magnetic orientation pipe nipple 5 register instrument string; The density p at pressure reduction Density Measuring Instrument 4 register instrument string dark H place in down-hole.

Shown in accompanying drawings 2, use the instrument string that the produced flow rate log device-traffic logger 3 of the present invention connects, construction operation when carrying in oil well well logging.

Concrete steps are as follows:

1) the ground logging truck 10 of instrument string sends instructions to Circuits System in traffic logger 3 by cable 7 and controls the control motor of motor/hydraulic-driven traffic logger 3 or hydraulic-driven arm 11 expansion action to setting size;

2) then control motor or form minimum circular passage between hydraulic-driven arm 11 and sleeve pipe 9, its minimum sectional area is S;

3) when described instrument string is in well H depths, set up Venturi effect Mathematical Modeling according to hydrodynamics, fluid continuity equation and fluid mechanical energy law of conservation, when well liquid is by minimum circular passage, the flowing velocity of well liquid can be caused by V _obe increased to V, meanwhile, the static pressure of well liquid is by P ₃be reduced to P ₄, and the force samples mouth of B point is at minimum annular channel cross-section place.Suppose: when described instrument string carries logging operation, the flow direction of well liquid flows from the bottom to top, instrument at the uniform velocity on propose motion.Namely following data are obtained:

P ₃>P ₄①

S ₀>S ②

V ₀<V ③；

Wherein, S ₀for the annular cross-sectional area on traffic logger between C point and sleeve pipe; S is P ₄annular cross-sectional area between static pressure thief hatch B point and sleeve pipe; V ₀for during by C point, the flowing velocity of well liquid; When V is by B point, the flowing velocity of well liquid;

4) pressure reduction Density Measuring Instrument 4 records density p at the section at well depth H place, if the static pressure difference Δ P=P of E and D point pressure thief hatch ₂-P ₁, then:

$\mathrm{\&rho;}=\frac{P_2-P_1}{\mathrm{\&Delta;h}\&times;g}=\frac{\mathrm{\&Delta;P}}{\mathrm{\&Delta;h}\&times;g}$ ④

Wherein: P ₁, P ₂with Δ h be respectively pressure reduction Density Measuring Instrument 4 at well depth H place, the static pressure of the force samples mouth of E and D point and difference in height, g is weight acceleration;

Ground logging truck 10, when gathering traffic logger 3 and pressure reduction Density Measuring Instrument 4 data, adopts the mode of time delays to carry out image data;

5) when control motor or the hydraulic-driven arm 11 minimum ring tee section B point of traffic logger 3, when moving to well depth H section, now, be Q by the flow of this section well liquid, then

Q＝S ₀×V ₀＝S×V ⑤

$P_3-P_4=\frac{\mathrm{\&rho;}}{2}(V^2-V_0^2)$ ⑥

Wherein: P ₄, P ₃be respectively traffic logger 3 when well depth H place, the static pressure of the force samples mouth of B and C point; S ₀, V ₀be respectively traffic logger 3 when well depth H place, the annular interface sectional area of C point and well liquid flowing velocity; S, V be respectively traffic logger 3 when well depth H place, the annular interface sectional area of B point and well liquid flowing velocity;

6. 5. formula is substituted into by above-mentioned:

$Q=S_0\sqrt{\frac{2(P_3-P_4)}{\mathrm{\&rho;}({\left(\frac{S_0}{S}\right)}^2-1)}}=S\sqrt{\frac{2(P_3-P_4)}{\mathrm{\&rho;}(1-{\left(\frac{S}{S_0}\right)}^2)}}$ ⑦；

4. substitute into 7. formula by above-mentioned, described traffic logger (3) is drawing at well depth H place, the well flow quantity Q value recorded:

$Q=S_0\sqrt{\frac{2\mathrm{\&Delta;h}(P_3-P_4)g}{\mathrm{\&Delta;P}({\left(\frac{S_0}{S}\right)}^2-1)}}=S\sqrt{\frac{2\mathrm{\&Delta;h}(P_3-P_4)g}{\mathrm{\&Delta;P}(1-{\left(\frac{S}{S_0}\right)}^2)}}$ ⑧。

Fig. 3 be inventive flow logging instrument 3 by after oil pipe 9, at the n-n sectional schematic diagram of Fig. 2.

Fig. 4 is after the control motor of inventive flow logging instrument 3 or hydraulic-driven arm 11 open certain size, at the m-m sectional schematic diagram of Fig. 2.

According to the present invention produced flow rate log device-traffic logger 3, other construction technologies some also can be derived.Wherein two kinds are enumerated at this.

The first, transfer well logging construction operation.

Shown in accompanying drawings 5, with the construction operation of the produced flow measurement device-traffic logger 3 of a kind of oil well down-off of the present invention logging method when well logging transferred by oil well.Be ground logging truck 10, cable 7, halter 6, centralizer 2, magnetic orientation pipe nipple 5, centralizer 2, traffic logger 3, pressure reduction Density Measuring Instrument 4, centralizer 2 and plug 1 connected mode from top to bottom in the connection of well logging construction Instrumental string.

The data point of analyzing and processing is in well logging: the static pressure sample point of described traffic logger 3 is A, B, D and E respectively, and other, consult construction technological process when carrying logging operation, can draw the value of the flow Q at well depth H place.

Wherein, step 3) in,

When instrument string transfers logging operation, the flow direction of well liquid flows from the bottom to top, and instrument at the uniform velocity transfers motion, obtains:

P ₅>P ₄①

S ₀>S ②

V ₀<V ③；

Wherein, S ₀for the annular cross-sectional area on traffic logger between A point and sleeve pipe; S is P ₄annular cross-sectional area between static pressure thief hatch B point and sleeve pipe; V ₀for during by A point, the flowing velocity of well liquid; When V is by B point, the flowing velocity of well liquid; P ₅for during by A point, the static pressure of well liquid;

When transferring construction operation, the well flow quantity Q value obtained:

$Q=S_0\sqrt{\frac{2\mathrm{\&Delta;h}(P_5-P_4)g}{\mathrm{\&Delta;P}({\left(\frac{S_0}{S}\right)}^2-1)}}=S\sqrt{\frac{2\mathrm{\&Delta;h}(P_5-P_4)g}{\mathrm{\&Delta;P}(1-{\left(\frac{S}{S_0}\right)}^2)}}.$

The second, during flushing, measures the construction operation of injection flow Q.

Shown in accompanying drawings 6, with the well logging construction operation of the produced flow measurement device-traffic logger 3 of a kind of downhole flow logging method of the present invention when flushing.It is ground logging truck 10, cable 7, halter 6, centralizer 2, magnetic orientation pipe nipple 5, centralizer 2, traffic logger 3, centralizer 2 and plug 1 connected mode from top to bottom that the series winding of well logging construction Instrumental connects.The same when carrying or transfer construction operation, pressure samples method is identical.Here not having pressure reduction Density Measuring Instrument 4, because the sealing of water is known, is constant.

The data point of analyzing and processing is in well logging: the static pressure sample point of described traffic logger 3 is C and B respectively, and other, consult construction technological process when carrying logging operation, can draw the value of the flow Q at well depth H place.Wherein, P ₃the measurement of the static pressure at static pressure thief hatch C place,

The well flow quantity Q value obtained:

$Q=S_0\sqrt{\frac{2\mathrm{\&Delta;h}(P_3-P_4)g}{\mathrm{\&Delta;P}({\left(\frac{S_0}{S}\right)}^2-1)}}=S\sqrt{\frac{2\mathrm{\&Delta;h}(P_3-P_4)g}{\mathrm{\&Delta;P}(1-{\left(\frac{S}{S_0}\right)}^2)}}.$

Above content is in conjunction with concrete preferred embodiment further description made for the present invention; can not assert that the specific embodiment of the present invention is only limitted to this; for general technical staff of the technical field of the invention; without departing from the inventive concept of the premise; some simple deduction or replace can also be made, all should be considered as belonging to the present invention by submitted to claims determination scope of patent protection.

Claims (10)

1. an oil well down-off measurement mechanism, comprise ground logging truck (10), and pass through the connected instrument string be located in down-hole casing (9) socket oil pipe (8) of cable (7), it is characterized in that, described instrument string comprises the halter (6), centralizer (2), magnetic orientation pipe nipple (5), centralizer (2), pressure reduction Density Measuring Instrument (4), traffic logger (3), centralizer (2) and the plug (1) that connect successively from top to bottom, and construction operation is carried in realization;

Described traffic logger (3) controls motor or hydraulic-driven arm (11) built with Circuits System, control to be respectively equipped with static pressure thief hatch in motor or hydraulic-driven arm (11) and pressure reduction Density Measuring Instrument (4), control motor or hydraulic-driven arm (11) open or closed action, realize oil downhole flow measurement.

2. oil well down-off measurement mechanism according to claim 1, it is characterized in that, described instrument string comprises the halter (6), centralizer (2), magnetic orientation pipe nipple (5), centralizer (2), traffic logger (3), pressure reduction Density Measuring Instrument (4), centralizer (2) and the plug (1) that connect successively from top to bottom, realizes transferring construction operation.

3. oil well down-off measurement mechanism according to claim 1, it is characterized in that, described instrument string comprises the halter (6), centralizer (2), magnetic orientation pipe nipple (5), centralizer (2), traffic logger (3), centralizer (2) and the plug (1) that connect successively from top to bottom, realizes flushing construction operation.

4. the oil well down-off measurement mechanism according to any one of claim 1-3, is characterized in that, the control motor in described traffic logger (3) or hydraulic-driven arm (11) middle part are provided with P ₄static pressure thief hatch B, P ₄the minimum place of annular cross-sectional area that static pressure thief hatch B is arranged on sleeve pipe (9) and controls between motor or hydraulic-driven arm (11) external diameter; The two ends up and down of described control motor or hydraulic-driven arm (11) are symmetrically arranged with P respectively ₃static pressure thief hatch C and P ₅static pressure thief hatch A.

5. oil well down-off measurement mechanism according to claim 4, is characterized in that, described symmetrically arranged P ₃static pressure thief hatch C and P ₅static pressure thief hatch A relative to the upper and lower side controlling motor or hydraulic-driven arm (11) apart from equal and relative to the equidirectional layout of traffic logger (3) tube wall.

6. oil well down-off measurement mechanism according to claim 1, it is characterized in that, described traffic logger (3) upper end connects pressure reduction Density Measuring Instrument (4), and the certain altitude difference Δ h place on pressure reduction Density Measuring Instrument (4) is respectively arranged with P ₁static pressure sample tap E and P ₂static pressure sample tap D, measures the density p at well depth H place; Wherein Δ h ≠ 0.

7., based on an oil well down-off measuring method for device described in claim 1, it is characterized in that, the method comprises the steps:

1) the ground logging truck (10) of instrument string sends instructions to control motor in traffic logger (3) or hydraulic-driven arm (11) expansion action to setting size by cable (7);

2) control motor or form minimum circular passage between hydraulic-driven arm (11) and sleeve pipe (9), its smallest cross-sectional is S;

3) when described instrument string is in well H depths, when well liquid is by minimum circular passage, the flowing velocity of well liquid can be caused by V _obe increased to V; Meanwhile, the static pressure of well liquid is by P ₃be reduced to P ₄, and P ₄the force samples mouth of static pressure thief hatch B point is at smallest cross-sectional S place, minimum circular passage; When instrument string being carried logging operation, the flow direction of well liquid flows from the bottom to top, instrument at the uniform velocity on propose motion, obtain:

P ₃>P ₄①

S ₀>S ②

V ₀<V ③

Wherein, S ₀for the annular cross-sectional area on traffic logger between C point and sleeve pipe; S is P ₄annular cross-sectional area between static pressure thief hatch B point and sleeve pipe; V ₀for during by C point, the flowing velocity of well liquid; When V is by B point, the flowing velocity of well liquid;

4) pressure reduction Density Measuring Instrument (4) records density p, if P at the section at well depth H place ₁static pressure thief hatch E and P ₂the static pressure difference Δ P=P of static pressure thief hatch D point pressure thief hatch ₂-P ₁, then:

$\mathrm{\&rho;}=\frac{P_2-P_1}{\mathrm{\&Delta;h}\&times;g}=\frac{\mathrm{\&Delta;P}}{\mathrm{\&Delta;h}\&times;g}$ ④

Wherein: P ₁, P ₂that pressure reduction Density Measuring Instrument (4) is at well depth H place P respectively with Δ h ₁static pressure thief hatch E and P ₂the static pressure of the force samples mouth of static pressure thief hatch D point and difference in height, g is weight acceleration;

5) as the control motor in traffic logger (3) or hydraulic-driven arm (11) minimum ring tee section P ₄static pressure thief hatch B point when moving to well depth H section, now, is Q by the flow of this section well liquid, then

Q＝S ₀×V ₀＝S×V ⑤

$P_3-P_4=\frac{\mathrm{\&rho;}}{2}(V^2-V_0^2)$ ⑥

Wherein: P ₄, P ₃be respectively traffic logger (3) when well depth H place, P ₄static pressure thief hatch B and P ₃the static pressure of the force samples mouth of static pressure thief hatch C point; S ₀, V ₀be respectively traffic logger (3) when well depth H place, P ₃the ring section sum well liquid flowing velocity of static pressure thief hatch C point; S, V be respectively traffic logger (3) when well depth H place, P ₄the ring section sum well liquid flowing velocity of static pressure thief hatch B point;

6) 5. formula is 6. substituted into by above-mentioned:

$Q=S_0\sqrt{\frac{2(P_3-P_4)}{\mathrm{\&rho;}({\left(\frac{S_0}{S}\right)}^2-1)}}=S\sqrt{\frac{2(P_3-P_4)}{\mathrm{\&rho;}(1-{\left(\frac{S}{S_0}\right)}^2)}}$ ⑦；

7) 4. substitute into 7. formula by above-mentioned, traffic logger (3) is drawing at well depth H place, the well flow quantity Q value recorded:

$Q=S_0\sqrt{\frac{2\mathrm{\&Delta;h}(P_3-P_4)g}{\mathrm{\&Delta;P}({\left(\frac{S_0}{S}\right)}^2-1)}}=S\sqrt{\frac{2\mathrm{\&Delta;h}(P_3-P_4)g}{\mathrm{\&Delta;P}(1-{\left(\frac{S}{S_0}\right)}^2)}}$ ⑧。

8. oil well down-off measuring method according to claim 7, is characterized in that, when carrying construction operation on described, traffic logger (3) is positioned at pressure reduction Density Measuring Instrument (4) below, measures at well depth H place P ₃static pressure thief hatch C, P ₄static pressure thief hatch B, P ₂static pressure sample tap D and P ₁the static pressure at static pressure thief hatch E place.

9. oil well down-off measuring method according to claim 7, is characterized in that, described in when transferring construction operation, traffic logger (3) is positioned at pressure reduction Density Measuring Instrument (4) top, measures at well depth H place P ₅static pressure thief hatch A, P ₄static pressure thief hatch B, P ₂static pressure thief hatch D and P ₁the static pressure at static pressure thief hatch E place;

When transferring construction operation, the well flow quantity Q value obtained:

$Q=S_0\sqrt{\frac{2\mathrm{\&Delta;h}(P_5-P_4)g}{\mathrm{\&Delta;P}({\left(\frac{S_0}{S}\right)}^2-1)}}=S\sqrt{\frac{2\mathrm{\&Delta;h}(P_5-P_4)g}{\mathrm{\&Delta;P}(1-{\left(\frac{S}{S_0}\right)}^2)}}.$

10. oil well down-off measuring method according to claim 7, is characterized in that, during described water flooding construction operation, traffic logger (3) is measured at well depth H place P ₃static pressure thief hatch C and P ₄the static pressure at static pressure thief hatch B place, wherein, P ₃the well flow quantity Q value that the measurement of the static pressure at static pressure thief hatch C place obtains:

$Q=S_0\sqrt{\frac{2\mathrm{\&Delta;h}(P_3-P_4)g}{\mathrm{\&Delta;P}({\left(\frac{S_0}{S}\right)}^2-1)}}=S\sqrt{\frac{2\mathrm{\&Delta;h}(P_3-P_4)g}{\mathrm{\&Delta;P}(1-{\left(\frac{S}{S_0}\right)}^2)}}.$