CN1796948A

CN1796948A - Continuous method for testing stratified flux under well and instrument

Info

Publication number: CN1796948A
Application number: CN 200410010584
Authority: CN
Inventors: 周敬训; 孙宝有
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-12-28
Filing date: 2004-12-28
Publication date: 2006-07-05

Abstract

The invention is an underground layered flow detecting method and apparatus. And the casing of the apparatus is connected with a throttle section whose outer diameter size matches the inner diameter of an operating cylinder and is somewhat less than that of the inner diameter of the operating cylinder, the throttle section is provided with upper and lower locating sensors, and a circuit has a function of high speed sampling and recording; a ground winch is used to make the apparatus go up and down in an underground tubular column, and the apparatus does not stop in the course of going up and down, and as the throttle section enters in the operating cylinder, the lower or upper locating sensor sends out a signal, the circuit samples at high speed and stores the data, and as the throttle section departs from the operating cylinder, the circuit stops high speed sampling and storing data, the upgoing and downgoing speeds of the apparatus are calculated according to the difference between the times the upper and lower locating sensors pass through the same section, successively.

Description

Laminated distributor under well flow continuous detecting method and instrument

Technical field:

The invention belongs to detection technique field, oil field, relate to a kind of water injection well (comprising polymer injection well) zonal flow rate continuous detecting technology and instrument.

Technical background:

The water injection well zonal flow rate detects and adopts collecting type and non-collective flow formula two big classes usually, most storing electronic instruments that adopt.

The detection method of collecting type is that instrument stand is gone into corresponding water injection allocator working barrel; the water that injects this layer flows into the stratum by flowmeter; owing to instrument reliably need be delivered to target working barrel position and seat envelope; through regular meeting run into because of factors such as underground work tube fouling cause instrument can not be accurately seat go into working barrel and effectively situations such as sealing cause detecting fail or data inaccurate, and operating difficulties, labour intensity is big, efficient is low.

The detection method of non-collective flow formula is a measuring center flow velocity in oil pipe, be converted to flow (instrumental calibration carries out) according to pipe aperture under the normal inner diameter condition, need to use centralizer to be in the oil pipe center to guarantee instrument, instrument need stop at the corresponding pipeline section of oil pipe when detecting, the pipe aperture variation that causes owing to reasons such as foulings will directly cause detecting the error of data, add the cumulative errors that successive subtraction method calculates, the layer less to injection rate IR, this error is unacceptable sometimes.

Summary of the invention:

The objective of the invention is that problem provides a kind of laminated distributor under well flow continuous detecting method and the instrument higher with precision that be convenient to operate in order to solve collecting type detection method operating difficulties, labour intensity is big, efficient is low and non-collective flow formula detection method error is big etc.

Laminated distributor under well flow continuous detecting method provided by the present invention is: adopt the ground winch to make instrument uplink and downlink in down-hole string, best and effectively the detection position be each layer working barrel or other minimum diameter place (because of in down-hole string everywhere internal diameter be different, usually minimum diameter is at the working barrel place of water injection allocator), the external diameter of instrument restriction portion and the formed gap of working barrel internal diameter are less, instrument does not stop in the uplink and downlink process, when the restriction portion of instrument enters working barrel, down (or on) alignment sensor sends signal, and the circuit high-speed sampling is also stored data; Go up (or down) and stop the high-speed sampling storage when alignment sensor leaves working barrel, during this period, restriction portion and working barrel axial overlap, most water can flow through the sense channel of instrument, the outside has only a small amount of leakage, be in accurate afflux state, it is the highest that detect flow accuracy this moment, the last alignment sensor on the instrument and the distance of following alignment sensor are known, the mistiming of passing through the same cross section of working barrel according to the last alignment sensor on the instrument and following alignment sensor calculates the uplink and downlink speed of instrument, thereby compensation is moved the relative discharge that is produced because of instrument with respect to working barrel, in the upstream or downstream process, all can realize flow detection, all detect in also can the uplink and downlink process so that confirm mutually and compensate.

Usually, the ground winch all is equipped with depth counter, can grasp the approximate location of instrument in the down-hole, near the Validity Test degree of depth time, can reduce winch velocity of rotation (being the translational speed of instrument in tubing string), to prolong effective detection time.

The gap that restriction portion and working barrel form can make the fraction flow not be detected because of leakage, but its shunting ratio fixes, and can simulate practical working situation calibrational capacity sensor to revise.

If instrument does not have the detection and localization function, equal high speed intensive sampling in whole descending and up process, detected flow value is higher through down-hole string internal diameter smaller part the time; Flow is less during through the internal diameter larger part, and these data all can go on record, need be with software or manually judged differentiation, be easy to generate identification error, and test curve is clear and intuitive inadequately, and the while also requires instrument that very big data storage capacity is arranged.

For the eccentric water injection string of routine, the water yield at each eccentric water distributor working barrel place is the summation of this water injection allocator and following each input horizon water yield, detects the flow at each water injection allocator working barrel place and adopts successive subtraction method, can obtain each layer injection rate IR.

Laminated distributor under well flow continuous detecting method provided by the present invention, it is low to have overcome traditional collecting type method operating difficulties, efficient; Shortcomings such as non-collective flow formula method low precision do not need seat envelope not need to stop in test process yet, have realized follow-on test, and are automatically in best and active position detection, easy and simple to handle, precision is high.

Laminated distributor under well flow continuous detecting instrument provided by the present invention, form by last alignment sensor 5 on fishing head 1, circuit 2, flow sensor 4, restriction portion 6 and the restriction portion 6 and following alignment sensor 8, the external diameter of restriction portion 6 and working barrel 12 couplings, be slightly less than the internal diameter of working barrel 12, the circuit 2 of instrument has the function of high-speed sampling record, restriction portion 6 can be made installation separately, also can make one with other parts, the external diameter that changes restriction portion 6 can adapt to the zonal flow rate detection needs of the water injection string of different minimum diameters.

Upper and lower alignment sensor 5 and 8 is used for the position of testing tube 12, when restriction portion 6 enters working barrel 12, can produce trigger pip and give circuit 2, this moment circuit 2 high-speed sampling and record data, upper and lower two position transducers 5 and 8 distance are known, can calculate the translational speed of instrument so that revise the relative current value that therefore produces according to its triggered time difference.

Laminated distributor under well flow continuous detecting instrument provided by the present invention is owing to instrument and working barrel when detecting flow are in accurate afflux state, accuracy of detection height; And because of alignment sensor is housed on the instrument, at high-speed sampling and record data effectively and during the optimum detection position, test data and curve are clear and intuitive.

Fig. 1 is a laminated distributor under well flow continuous detecting instrument structural representation provided by the present invention.

Fig. 2 is the principle schematic of alignment sensor 5 and following alignment sensor 8 on the laminated distributor under well flow continuous detecting instrument provided by the present invention.

Fig. 3 is that laminated distributor under well flow rate testing methods provided by the present invention is tested synoptic diagram in the eccentric water injection string of routine.

Among Fig. 1,1. 8. times alignment sensors of alignment sensor 6. restriction portions, 7. flow channels on fishing head 2. circuit 3. inlet openings 4. flow sensors 5..

Among Fig. 2,10. Hall circuit 11. magnet steel 12. working barrels

Among Fig. 3,9. packer 10. oil pipes 12. working barrels 13. water injection allocators

Embodiment:

As shown in Figure 3: for the eccentric water injection string of routine, by packer 9, oil pipe 10, water injection allocator 13 extremely working barrel 12 etc. form, the internal diameter of packer is 50-62mm, and pipe aperture is 62mm, and the internal diameter of working barrel 12 is 46mm, it is the minimum place of whole tubing string internal diameter, be the optimum position of flow detection, instrument restriction portion external diameter can be designed to 44mm, to guarantee to pass through smoothly working barrel, when the instrument restriction portion was in the 62mm oil pipe, water is flow measurement mistake outside instrument mainly; When the instrument restriction portion entered working barrel 12, most water flowed out through the flow channels 7 of instrument internal, has only a spot of water to flow through the annular gap, determines owing to its shunting ratio, can compensate and correct.

As shown in Figure 1: described laminated distributor under well flow continuous detecting instrument is made up of fishing head 1, circuit 2, inlet opening 3, flow sensor 4, last alignment sensor 5, following alignment sensor 8, restriction portion 6 and flow channels 7, upper and lower alignment sensor 5 and 8 is installed on the restriction portion 6, and the inner chamber of inlet opening 3, flow sensor 4 and flow channels 7 are communicated with.When restriction portion 6 enters working barrel, most water enters from inlet opening 3, flow out from flow channels 7 through flow sensor 4, circuit 2 is used to handle the signal of flow sensor 4 and the triggering state of basis and upper and lower alignment sensor 5 and 8, begins and stop high-speed sampling and data storage.

Flow sensor 4 can be the sensor of electromagnetism, ultrasound wave, whirlpool or other principle.

As shown in Figure 2: the last alignment sensor 5 and the following alignment sensor 8 of described laminated distributor under well flow continuous detecting instrument are made up of at least two pairs of switch Hall circuits 10 and magnet steel 11 respectively, they place the same cross section of restriction portion 6 and along the center symmetry, because of eccentric water distributor working barrel 12 is that permeability magnetic material is made, so, when restriction portion 6 during near it, the magnetic line of force of magnet steel 11 distributes and is changed, the magnetic field intensity that acts on the Hall circuit 10 can change, thereby changes the output state of Hall circuit 10.Have only when two pairs of Hall circuit signals change output state simultaneously, last alignment sensor 5 or down the output trigger pip of alignment sensor 8 be only useful signal, can avoid in descending and up process the one-sided generation erroneous trigger signal during near other position of tubing string of restriction portion like this.

Claims

1. laminated distributor under well flow continuous detecting method, adopt the ground winch to make instrument uplink and downlink in down-hole string, it is characterized in that: the detection position is at each layer working barrel or other minimum diameter place, instrument is not done stop in the uplink and downlink process, when the restriction portion of instrument enters working barrel, following (or on) alignment sensor on the instrument sends signal, the circuit high-speed sampling is also stored data, high-speed sampling finished when alignment sensor left working barrel to go up (or down), mistiming according to last orientation detection sensors and the same cross section of following orientation detection sensors process working barrel calculates the uplink and downlink speed of instrument, moves the relative discharge that is produced with respect to working barrel thereby compensate the modifying factor instrument.

2. laminated distributor under well flow continuous detecting method according to claim 1 is characterized in that: when the axial location of restriction portion and working barrel was overlapping, instrument was in accurate afflux state, and most water flows through from the instrument internal passage.

3. laminated distributor under well flow continuous detecting method according to claim 1 is characterized in that: can detect in the upstream or downstream process, compensate and revise so that the provisional capital detection is also mutual up and down.

4. laminated distributor under well flow continuous detecting instrument, comprise fishing head, circuit, flow sensor and shell etc., it is characterized in that: the inner chamber of inlet opening (3), sensor (4) and flow channels 7 are communicated with, on tool housing, connect restriction portion (6), its outside dimension and working barrel internal diameter size coupling, and less than the internal diameter of working barrel, alignment sensor (5) and following alignment sensor (8) are housed on the restriction portion (6), circuit (2) has the function of high-speed sampling record.

5. laminated distributor under well flow continuous detecting instrument according to claim 4 is characterized in that: go up alignment sensor (5) and following alignment sensor (8) and be made up of at least two pairs of Hall circuits (10) and magnet steel (11) respectively.

6. laminated distributor under well flow continuous detecting instrument according to claim 4, it is characterized in that: restriction portion (6) can be a separate part, also can make one with shell.