CN1479116A - Wells monitoring method of movable water saturation between using gadolinium tracing neutron gamma energy spectrum - Google Patents
Wells monitoring method of movable water saturation between using gadolinium tracing neutron gamma energy spectrum Download PDFInfo
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- CN1479116A CN1479116A CNA031465757A CN03146575A CN1479116A CN 1479116 A CN1479116 A CN 1479116A CN A031465757 A CNA031465757 A CN A031465757A CN 03146575 A CN03146575 A CN 03146575A CN 1479116 A CN1479116 A CN 1479116A
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Abstract
A method for estimating the residual petroleum reserve in oil field and the useful regions features that the Gd instead of tritium is used as tracing agent in interwall monitor, the well logging is combined with the sampling at well mouth, and the saturation degree of the flowing water in stratum is measured. It includes such steps as measuring the neutronic gamma base line of water injection well and oil well, injecting tracing agent Gd inw ater injection well, measuring the tracing cross-section, logging the oil well while sampling at well mouth, and analyzing reservoir by reservoir.
Description
Technical field the invention belongs to waterflooding oil field gadolinium spike inter-well test technology, relate to the application of nuclear technology in reservoir engineering, calculating, water injection well neutron-gamma logging and the water injection profile that comprises selection, the injection rate IR of water-soluble gadolinium tracer agent detects, producing well neutron-gamma logging and tracer agent well head and down-hole combined monitoring, adopts section contrast and integrated interpretation through notes and asks for that mobile water saturation distributes between well.
The existing nuclear tracing method that is used for inter-well test of background technology adopts tritide to make tracer agent.Tritium is a very long radioactive nuclide of half life period, and its use is subjected to the restriction of environmental requirement and construction safety.And gadolinium is a non-radioactive substance, and is harmless to environment and personnel.Contain the gadolinium tracer agent as if use in inter-well test and then can realize safe construction, and can use the neutron well logging method, accurately measure carrying gadolinium water in water injection well each input horizon position and producing well in corresponding output layer position, thereby bring considerable economy and environmental benefit.
Summary of the invention core technology of the present invention is to replace tritium to make tracer agent with gadolinium in the monitoring between also, the well head single detection of sampling is expanded to down-hole well logging and is sampled as secondary comprehensive detection for the well head of advocating peace, monitoring objective is changed into mensuration stratum mobile water saturation from measuring the stratum water saturation, for estimation remaining oil saturation and prediction tertiary oil recovery potentiality provide foundation.Compare with tracing method between existing well, realize that at thick zone subdivision, thin layer evaluation with a kind of tracer agent aspect such as multilayer detection has advantage.Particular content comprises:
1, replace HTO to make tracer agent with containing gadolinium water-soluble tracer (comprising the chloride, complex compound of gadolinium etc.).
2, replace moisture volume to calculate the consumption of gadolinium by following formula with movable water volume
Q=A * V
WmIn * MDQ (1) formula: Q is the consumption of tracer element gadolinium;
But MDQ is minimum detected level, mg/L;
A is the index correction coefficient, is decided by the unit of Q and MDQ, the delay and the outflow loss amount of tracer agent;
V
WmBe the maximum movable water volume of injection-production well group control, m
3,
V
Wm=π r
2H S
Wm=π r
2H [1-(S
Wi+ S
Oi)] in (2) formula: r is a well spacing, m; H is a reservoir average effective thickness, m; is an average pore, decimal; S
WmBe the high saturation of movable water; S
WiBe irreducible water saturation; S
OiBe residual oil saturation.
3, in water injection well, measure gadolinium spike water injection profile with the neutron gamma spectrometry log.
4, in producing well, survey the payzone section, divide substratum to calculate gadolinium tracer agent quantum of output and the movable water voids of gadolinium spike degree with the neutron gamma spectrometry log.
5, water injection well, producing well neutron gamma gadolinium spike section are done between well and contrasted, divide substratum to determine to annotate and adopt corresponding relation.
6, to water injection well and producing well gadolinium spike neutron-gamma logging section and the processing of inter-well test aggregation of data, divide substratum to determine that mobile water saturation distributes between water drive direction, speed and well.
Technological merit: 1. can measure gadolinium spike neutron gamma spectra continuous logging section, obtain layering injection rate IR, mobile water saturation and water logging grade; 2. be convenient to dynamically Duo Jing stratum contrast between water injection well and producing well; 3. the tracer agent gadolinium is a rare earth element, and China's rare-earth mineral reserves account for the first in the world, and it is secure to originate; 4. tracer agent is "dead", nontoxic, and is free from environmental pollution, do not injure the workmen.
Embodiment
1, collects data
Collect related datas such as the required geology of job design, reservoir engineering, well logging, overall understanding construction well group is annotated the process of adopting.
2, determine the minimum extraction concentration of tracer agent
Calculating learns that gadolinium thermal-neutron capture cross-section identical in quality is 8456 times of fresh water, and its photon yield is 8456 * 3=25368 times of fresh water.About 0.0394 milligram of gadolinium equates with the photon yield of 1g water.If the concentration of gadolinium is 7.88mg/L in the movable water, its photon yield then is 1.2 times of fresh water.The concentration of the end of extraction that this concentration can be decided to be gadolinium.
3, calculate the consumption of tracer agent
After minimum extraction concentration is determined, can calculate the injection rate IR of tracer agent, and check with different calculation methods.
4, survey the tracer agent input profile
Before injecting tracer agent,, record background valuess such as gross-count rate, skeleton counting rate and hydrogen counting rate earlier at neutron gamma spectra of water filling well surveying.After injecting tracer agent, survey water injection profile, remove background values, determine that substratum water sucting thickness and tracer agent inject sendout.Carry the slug volume of tracer agent, determine with total consumption by injecting the gadolinium maximum concentration.Theoretical Calculation points out, the gadolinium maximum concentration should be greater than every cubic metre of reservoir 410g, is 30% water layer to factor of porosity, and the Cmax that injects the aqueous solution gadolinium is 1.37Kg/m
3
5, the flow direction and the produced quantity of tracer agent between well monitored
Before tracer agent no show producing well,, and begin sample detecting at well head earlier at relevant each well surveying baseline.After finding the slight trace agent, the neutron gamma spectroscopy tool (GST) placed appropriate depth detects in the well.When the tracer agent quantum of output is significantly increased, instrument is surveyed tracer agent payzone section to zone of interest down.The deduction background is done detail stratigraphic division and analysis to tracer agent extraction section.
6, contrast between well
To water injection well in the well group and producing well, adopt corresponding relation by contrasting between tracer agent injection and extraction section well carrying out, divide substratum to get clear to annotate, and then inject the flow direction, flow velocity and the assignment of traffic of water in the clear and definite well group and try to achieve mobile water saturation distribution between well.
Claims (2)
1, the present invention is " a gadolinium spike neutron gamma spectra mobile water saturation monitoring method between well ", belongs to waterflooding oil field tracer agent inter-well test method, it is characterized by:
(1) makees circulating water tracer agent between well with containing gadolinium water-soluble tracer (chloride, complex compound and other water soluble compound that comprise gadolinium), and in computing formula, replace the consumption of moisture volume estimation gadolinium with movable water volume;
(2) measure gadolinium tracer agent water injection profile at water injection well with the neutron gamma spectrometry log;
(3) (annular space) tracer agent output combined monitoring in producing well is implemented well head and well is measured gadolinium tracer agent production profile with the neutron gamma spectrometry log;
(4) the tracer agent water filling and the production profile of water injection well and producing well are done contrast and multiwell analysis between well, segmentation substratum injection-production relation, comprehensive well head and underground monitoring data are divided substratum to determine to inject between current direction, flow velocity and mobile water saturation well and are distributed.
2, require " the neutron gamma spectrometry log " of indication in 1, it is characterized by:
(1) adopts isotope neutron source or pulsed neutron source;
(2) adopt scintillation detector, measure and capture gamma spectra or intergral counting rate;
(3) adopt minor diameter list/double source apart from downhole cartridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031465757A CN1479116A (en) | 2003-07-08 | 2003-07-08 | Wells monitoring method of movable water saturation between using gadolinium tracing neutron gamma energy spectrum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031465757A CN1479116A (en) | 2003-07-08 | 2003-07-08 | Wells monitoring method of movable water saturation between using gadolinium tracing neutron gamma energy spectrum |
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|---|---|
| CN1479116A true CN1479116A (en) | 2004-03-03 |
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| CNA031465757A Pending CN1479116A (en) | 2003-07-08 | 2003-07-08 | Wells monitoring method of movable water saturation between using gadolinium tracing neutron gamma energy spectrum |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101135733B (en) * | 2007-10-09 | 2010-05-19 | 西安奥华电子仪器有限责任公司 | Pulse neutron double spectrum tracing remaining oil saturation logging method |
| CN1699998B (en) * | 2005-06-06 | 2011-08-31 | 里群 | Constant quantity substance tracer agent for oilfield monitoring and application in oil deposit dynamic monitoring |
| CN103321636A (en) * | 2013-07-11 | 2013-09-25 | 中国石油天然气股份有限公司 | Non-radioactivity tracing flow well logging method and process based on pulse neutron technology |
| CN104564024A (en) * | 2014-12-30 | 2015-04-29 | 焦春红 | Environment-friendly tracer flow water witch |
| CN106150481A (en) * | 2015-04-01 | 2016-11-23 | 中国石油天然气股份有限公司 | Profile-log of water injection measuring method based on natural gamma baseline |
-
2003
- 2003-07-08 CN CNA031465757A patent/CN1479116A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1699998B (en) * | 2005-06-06 | 2011-08-31 | 里群 | Constant quantity substance tracer agent for oilfield monitoring and application in oil deposit dynamic monitoring |
| CN101135733B (en) * | 2007-10-09 | 2010-05-19 | 西安奥华电子仪器有限责任公司 | Pulse neutron double spectrum tracing remaining oil saturation logging method |
| CN103321636A (en) * | 2013-07-11 | 2013-09-25 | 中国石油天然气股份有限公司 | Non-radioactivity tracing flow well logging method and process based on pulse neutron technology |
| CN104564024A (en) * | 2014-12-30 | 2015-04-29 | 焦春红 | Environment-friendly tracer flow water witch |
| CN106150481A (en) * | 2015-04-01 | 2016-11-23 | 中国石油天然气股份有限公司 | Profile-log of water injection measuring method based on natural gamma baseline |
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