CN101029569A - Neutron gamma logging instrument and method for determining residual-oil saturation degree - Google Patents
Neutron gamma logging instrument and method for determining residual-oil saturation degree Download PDFInfo
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- CN101029569A CN101029569A CN 200710064808 CN200710064808A CN101029569A CN 101029569 A CN101029569 A CN 101029569A CN 200710064808 CN200710064808 CN 200710064808 CN 200710064808 A CN200710064808 A CN 200710064808A CN 101029569 A CN101029569 A CN 101029569A
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Abstract
A gamma detector includes cable head, collar locator, gamma detector, shield, scatterer, neutron source room, neutron source rod, quick release coupling and circuit system. A scintillation counter is preset in the gamma detector. There is Am-Be neutron source in the source room. A method for saturation detection of left oil in well is also included. It includes: detecting gamma base line, injecting tracer liquid, detecting well depth, detecting tracer line.
Description
Technical field
The present invention relates to a kind of oil well logger, and use it for the method for determining remaining oil saturation in the oil-producing formation.
Background technology
Remaining oil saturation is to weigh the important parameter of oil reservoir recovery percent.For the payzone that the cased well water saturation rises, adopted boron (gadolinium) the neutron life time log method of annotating at present, the use neutron lifetime logging tool is determined the remaining oil saturation in the oil-producing formation.Neutron lifetime logging tool utilization oil, water are determined remaining oil saturation to the difference of thermal-neutron capture cross-section.Instrument mainly comprises accelerator for neutron production, far and near gamma detector, box cupling magnetic locator and Circuits System, accelerator for neutron production uses neutron tube as pulsed neutron source, the neutron tube price is high and be consumers, and this just causes this instrument overall price costliness, and cost reaches more than 1,000,000 yuan.Also need do loaded down with trivial details parameter when being used for determining remaining oil saturation and convert, cause logging cost higher.And annotate in boron (gadolinium) the neutron life time log construction, the tracking measurement number of times is few, causes measure error bigger, is difficult to obtain explanation results accurately.
Summary of the invention
Technical problem to be solved by this invention provides a kind of simple in structure, stable performance, and the logging instrument that cost is cheap is relatively used it in the remaining oil exploitation and can be improved accuracy of measurement, and logging cost greatly reduces, thereby is easy to apply.
For this reason, the invention provides a kind of neutron-gamma logging instrument, it is characterized in that: comprise cable head, collar locator, gamma detector, shield, scattering object, neutron source chamber, neutron source bar, snap joint and circuit control system; Described gamma detector is built-in with scintillation counter; The indoor Am-Be neutron source that is equipped with of described neutron source;
Connect successively by screw thread between described cable head, collar locator, gamma detector, shield, the scattering object, be connected by bulb between scattering object and the neutron source chamber, be connected successively by screw thread between neutron source chamber and neutron source bar, the snap joint;
Described Circuits System comprises low-voltage circuit, high-tension circuit, gamma detector, front end circuit, shaping compound circuit, cable drive circuit and box cupling positioning circuit; Described low-voltage circuit is imported power supply with cable and is processed into DC source, supply with high-tension circuit, front end circuit, shaping compound circuit, cable drive circuit and box cupling positioning circuit, described high-tension circuit provides high voltage source for gamma detector, the output signal of described gamma detector is amplified through front end circuit, carrying out signal with the output signal of box cupling positioning circuit through the shaping compound circuit synthesizes, after the cable drive circuit carries out power amplification and impedance matching, deliver to the well logging ground instrument by cable again through cable head.
Described neutron source mid point to the distance between the scintillation counter mid point is 550mm.
The external diameter of described neutron-gamma logging instrument is 45mm, and length is 2620mm.
The present invention also provides the method that above-mentioned neutron-gamma logging instrument is used for determining the oil-producing formation remaining oil saturation, comprises the steps:
(1) the neutron gamma-ray tool is checked: the neutron source chamber is not installed during inspection apparatus, provides DC voltage, if box cupling positioning circuit and gamma detector output pulse signal illustrate that instrument is working properly to instrument;
(2) the neutron source chamber is installed: the neutron source bar with after the neutron source chamber is threaded, is extracted the neutron source chamber rapidly from the neutron source jar, and with after the other parts of neutron-gamma logging instrument are connected, in time with in the neutron-gamma logging instrument lower going-into-well;
(3) measure neutron gamma baseline: the neutron-gamma logging instrument is arrived the shaft bottom down, be located on the ball-and-seat of oil pipe bottom, carry logger on lentamente then, when the signal of collar locator, gamma detector occurring, carry on maintenance 800m/h tests the speed and measure neutron gamma baseline, up to measuring well section top 20m, measure article one baseline; Then instrument is arrived the shaft bottom once more down, the duplicate measurements baseline when two baseline repeatability reach requirement, arrives the shaft bottom down with instrument, waits for the gadolinium-injecting labelling agent aqueous solution;
(4) the gadolinium-injecting labelling agent aqueous solution: the concentration that will prepare in advance is that 1.0% or 0.75% the gadolinium tracer aqueous solution injects well from oil pipe, clear water reinjects, control suitable injection pressure, to guarantee that the tracer aqueous solution to Water Flooding Layer and diffusion of water logging position and infiltration, forms high capture cross-section district; Guarantee simultaneously to be full of the gadolinium tracer aqueous solution with oil casing annular space in the oil pipe corresponding, so that the log base value is stable with the measuring well section;
(5) the log school is dark: the curve in the neutron gamma baseline that records and the completion well logging constitutional diagram is compared, and the calibration depth of stratum also identifies the perforated zone;
(6) measure the neutron gamma and ooze gadolinium spike curve: carry out 3～5 real-time follow-ups, with measure one by one to ooze gadolinium spike curve superimposed with baseline, observation is in the variation of perforated zone neutron gamma counting rate value;
(7) ooze gadolinium spike curve after the measurement pressure release: sleeve gate is opened pressure release, survey 1～2 again and ooze gadolinium spike curve, observe variation, to confirm high pressure water-yielding stratum, main force's water-yielding stratum and to scurry groove in each perforated zone counting rate value;
(8) unload the neutron source chamber: well logging finishes, and the neutron-gamma logging instrument is hung out from well head, and dismounting neutron source chamber is inserted the neutron carrying shield rapidly with the neutron source chamber, and returned the storehouse, source.
(9) calculate remaining oil saturation: according to the neutron gamma baseline of being surveyed and select ooze gadolinium spike curve, carry out well-log information and handle and explain, calculate the remaining oil saturation of oil-producing formation, and definite Water Flooding Layer.
Beneficial effect of the present invention is: compare with the neutron lifetime logging tool that present use is more, neutron-gamma logging instrument of the present invention is simple in structure, good stability; And logging speed is fast, can repeatedly carry out tracking measurement after oozing the gadolinium tracer, thereby reliable well-log information is provided, and guarantees the accuracy of explanation results.The radioactive source of neutron-gamma logging instrument of the present invention is an Am-Be neutron source, and long half time, so the long service life of instrument make the cost of instrument and well logging expense greatly reduce, thereby be easy to apply.
Description of drawings
Fig. 1 is the structural representation of neutron-gamma logging instrument of the present invention;
Fig. 2 is the Circuits System block diagram of neutron-gamma logging instrument of the present invention;
Fig. 3 is that the neutron source chamber of neutron-gamma logging instrument of the present invention is loaded on the structural representation in the neutron carrying shield.
The specific embodiment
Further specify the present invention below in conjunction with the drawings and specific embodiments.
Figure 1 shows that the structural representation of neutron-gamma logging instrument of the present invention, comprise cable head 1, collar locator 2, gamma detector 3, shield 4, scattering object 5, neutron source chamber 6, neutron source bar 7, snap joint 8.Gamma detector 3 is built-in with scintillation counter 9, and neutron source chamber 6 is built-in with Am-Be neutron source 10, and Am-Be neutron source 10 to the distance between the gamma-ray probe 9 is 550mm.The external diameter of neutron-gamma logging instrument is 45mm, and total length is 2620mm.Connect successively by screw thread between cable head 1, collar locator 2, gamma detector 3, shield 4, the scattering object 5, be connected by snap joint 11 between scattering object 5 and the neutron source chamber 6, be connected successively by screw thread between neutron source chamber 6 and neutron source bar 7, the snap joint 8.
Figure 2 shows that the Circuits System block diagram of neutron-gamma logging instrument of the present invention.As seen from the figure, circuit control system comprises low-voltage circuit, high-tension circuit, gamma detector, front end circuit, shaping compound circuit, cable drive circuit and box cupling positioning circuit; Described low-voltage circuit is imported power supply with cable and is processed into DC source, supply with high-tension circuit, front end circuit, shaping compound circuit, cable drive circuit and box cupling positioning circuit, described high-tension circuit provides high voltage source for gamma detector, the output signal of described gamma detector is amplified through front end circuit, carrying out signal with the output signal of box cupling positioning circuit through the shaping compound circuit synthesizes, after the cable drive circuit carries out power amplification and impedance matching, deliver to the well logging ground instrument by cable again through cable head.
The neutron source chamber that Figure 3 shows that neutron-gamma logging instrument of the present invention is loaded on the structural representation in the neutron carrying shield.Because Am-Be neutron source has radioactivity, so Am-Be neutron source places in the metal can of filling paraffin at ordinary times, prevents neutron to external radiation, just is installed on the neutron-gamma logging instrument when needs are logged well, immediately in the lower going-into-well.As shown in the figure, the top of neutron carrying shield 12 is provided with cover 13 and handle 14, and neutron source chamber 6 places in the neutron carrying shield 12 as shown in the figure.When needs are installed neutron source chamber 6, rapidly neutron source bar 7 is threaded with neutron source chamber 6 by screw thread 15, neutron source chamber 6 is extracted from neutron source jar 12, and be connected by snap joint 11 with the other parts of neutron-gamma logging instrument.
Claims (4)
1. a neutron-gamma logging instrument is characterized in that: comprise cable head, collar locator, gamma detector, shield, scattering object, neutron source chamber, neutron source bar, snap joint and circuit control system; Described gamma detector is built-in with scintillation counter; The indoor Am-Be neutron source that is equipped with of described neutron source;
Connect successively by screw thread between described cable head, collar locator, gamma detector, shield, the scattering object, be connected by snap joint between scattering object and the neutron source chamber, be connected successively by screw thread between neutron source chamber and neutron source bar, the snap joint;
Described Circuits System comprises low-voltage circuit, high-tension circuit, gamma detector, front end circuit, shaping compound circuit, cable drive circuit and box cupling positioning circuit; Described low-voltage circuit is imported power supply with cable and is processed into DC source, supply with high-tension circuit, front end circuit, shaping compound circuit, cable drive circuit and box cupling positioning circuit, described high-tension circuit provides high voltage source for gamma detector, the output signal of described gamma detector is amplified through front end circuit, carrying out signal with the output signal of box cupling positioning circuit through the shaping compound circuit synthesizes, after the cable drive circuit carries out power amplification and impedance matching, deliver to cable head and transmit earthward again.
2. a kind of neutron-gamma logging instrument according to claim 1 is characterized in that: described neutron source mid point to the distance between the scintillation counter mid point is 550mm.
3. a kind of neutron-gamma logging instrument according to claim 1 is characterized in that: the external diameter of described neutron-gamma logging instrument is 45mm, and length is 2620mm.
4. the method for remaining oil saturation in the definite oil well comprises the steps:
(1) the described neutron-gamma logging instrument of claim 1 is checked: the neutron source chamber is not installed during inspection apparatus, provides DC voltage, if box cupling positioning circuit and gamma detector output pulse signal illustrate that instrument is working properly to instrument;
(2) the neutron source chamber is installed: the neutron source bar with after the neutron source chamber is threaded, is extracted the neutron source chamber rapidly from the neutron source jar, and with after the other parts of neutron-gamma logging instrument are connected, in time with in the neutron-gamma logging instrument lower going-into-well;
(3) measure neutron gamma baseline: the neutron-gamma logging instrument is arrived the shaft bottom down, be located on the ball-and-seat of oil pipe bottom, carry logger on lentamente then, when the signal of collar locator, gamma detector occurring, carry on maintenance 800m/h tests the speed and measure neutron gamma baseline, up to measuring well section top 20m, measure article one baseline; Then instrument is arrived the shaft bottom once more down, the duplicate measurements baseline when two baseline repeatability reach requirement, arrives the shaft bottom down with instrument, waits for the gadolinium-injecting labelling agent aqueous solution;
(4) the gadolinium-injecting labelling agent aqueous solution: the concentration that will prepare in advance is that 1.0% or 0.75% the gadolinium tracer aqueous solution injects well from oil pipe, clear water reinjects, control suitable injection pressure, to guarantee that the tracer aqueous solution is to Water Flooding Layer and diffusion of water logging position and infiltration, form high capture cross-section district, and can not drive away oil or water in the payzone; Guarantee simultaneously to be full of the gadolinium tracer aqueous solution with oil casing annular space in the oil pipe corresponding, so that the log base value is stable with the measuring well section;
(5) the log school is dark: the curve in the neutron gamma baseline that records and the completion well logging constitutional diagram is compared, and the calibration depth of stratum also identifies the perforated zone;
(6) measure the neutron gamma and ooze gadolinium spike curve: carry out 3～5 real-time follow-ups, with measure one by one to ooze gadolinium spike curve superimposed with baseline, observation is in the variation of perforated zone neutron gamma counting rate value;
(7) ooze gadolinium spike curve after the measurement pressure release: sleeve gate is opened pressure release, survey 1～2 again and ooze gadolinium spike curve, observe variation, to confirm high pressure water-yielding stratum, main force's water-yielding stratum and to scurry groove in each perforated zone counting rate value;
(8) unload the neutron source chamber: well logging finishes, and the neutron-gamma logging instrument is hung out from well head, and dismounting neutron source chamber is inserted the neutron carrying shield rapidly with the neutron source chamber, and returned the storehouse, source;
(9) calculate remaining oil saturation: according to the neutron gamma baseline of being surveyed and select ooze gadolinium spike curve, carry out well-log information and handle and explain, calculate the remaining oil saturation of oil-producing formation, and definite Water Flooding Layer.
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| CN 200710064808 CN101029569A (en) | 2007-03-27 | 2007-03-27 | Neutron gamma logging instrument and method for determining residual-oil saturation degree |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101451434A (en) * | 2007-12-05 | 2009-06-10 | 普拉德研究及开发股份有限公司 | Downhole imaging tool utilizing x-ray generator |
| CN101240706B (en) * | 2008-03-13 | 2012-05-23 | 西安石油大学 | Annular space logging process of neutron gamma-ray logging instrument for well gadolinium-injecting labelling |
| CN102606142A (en) * | 2012-04-13 | 2012-07-25 | 武汉海阔科技有限公司 | Logging coupling detection system |
| CN103069106A (en) * | 2010-04-21 | 2013-04-24 | 沙特阿拉伯石油公司 | An expert system for selecting fit-for-purpose technologies and wells for reservoir saturation monitoring |
| CN104564024A (en) * | 2014-12-30 | 2015-04-29 | 焦春红 | Environment-friendly tracer flow water witch |
| CN105672981A (en) * | 2016-01-11 | 2016-06-15 | 沈阳弗雷泽物探技术有限公司 | High-precision oil-well residual oil gas logging instrument based on controllable source technology and method |
| CN107851401A (en) * | 2015-07-28 | 2018-03-27 | 西达-赛奈医疗中心 | MRI CT compatibility dynamic motile moulds |
| CN108005645A (en) * | 2017-12-01 | 2018-05-08 | 西京学院 | A kind of portable compensated neutron logging tool three-stage graduation device |
| CN109870731A (en) * | 2019-03-15 | 2019-06-11 | 中广核研究院有限公司 | The production method and well logging apparatus of neutron source of gamma gamma logging |
| CN113464130A (en) * | 2021-08-19 | 2021-10-01 | 陕西恒合石油科技有限公司 | Rapid and accurate water finding method for horizontal well |
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2007
- 2007-03-27 CN CN 200710064808 patent/CN101029569A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101451434B (en) * | 2007-12-05 | 2013-10-02 | 普拉德研究及开发股份有限公司 | Downhole imaging tool utilizing X-ray generator |
| CN101451434A (en) * | 2007-12-05 | 2009-06-10 | 普拉德研究及开发股份有限公司 | Downhole imaging tool utilizing x-ray generator |
| CN101240706B (en) * | 2008-03-13 | 2012-05-23 | 西安石油大学 | Annular space logging process of neutron gamma-ray logging instrument for well gadolinium-injecting labelling |
| CN103069106B (en) * | 2010-04-21 | 2015-06-10 | 沙特阿拉伯石油公司 | Tool for selecting fit-for-purpose technologies for reservoir saturation monitoring and computerized method |
| CN103069106A (en) * | 2010-04-21 | 2013-04-24 | 沙特阿拉伯石油公司 | An expert system for selecting fit-for-purpose technologies and wells for reservoir saturation monitoring |
| CN102606142A (en) * | 2012-04-13 | 2012-07-25 | 武汉海阔科技有限公司 | Logging coupling detection system |
| CN102606142B (en) * | 2012-04-13 | 2014-12-10 | 武汉海阔科技有限公司 | Logging coupling detection system |
| CN104564024A (en) * | 2014-12-30 | 2015-04-29 | 焦春红 | Environment-friendly tracer flow water witch |
| CN107851401A (en) * | 2015-07-28 | 2018-03-27 | 西达-赛奈医疗中心 | MRI CT compatibility dynamic motile moulds |
| CN105672981A (en) * | 2016-01-11 | 2016-06-15 | 沈阳弗雷泽物探技术有限公司 | High-precision oil-well residual oil gas logging instrument based on controllable source technology and method |
| CN108005645A (en) * | 2017-12-01 | 2018-05-08 | 西京学院 | A kind of portable compensated neutron logging tool three-stage graduation device |
| CN108005645B (en) * | 2017-12-01 | 2020-12-01 | 西京学院 | Portable compensation neutron logger three-level graduator |
| CN109870731A (en) * | 2019-03-15 | 2019-06-11 | 中广核研究院有限公司 | The production method and well logging apparatus of neutron source of gamma gamma logging |
| CN113464130A (en) * | 2021-08-19 | 2021-10-01 | 陕西恒合石油科技有限公司 | Rapid and accurate water finding method for horizontal well |
| CN113464130B (en) * | 2021-08-19 | 2024-07-09 | 陕西恒合石油科技有限公司 | Rapid and accurate water finding method for horizontal well |
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Open date: 20070905 |