CN103775056A - Fireflood well gas tracer detecting method - Google Patents
Fireflood well gas tracer detecting method Download PDFInfo
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Abstract
The invention discloses a fireflood well gas tracer detecting method, and belongs to the technical field of oil exploitation. The parameters such as distribution of injected air, the air movement direction and the migration time are analyzed according to monitoring data, then the combustion direction of a firing line can be judged, and a reference and a basis are provided for injecting and exploiting parameter regulating and controlling. Sulfur hexafluoride serves as a fireflood well gas tracer agent, during the fireflood air injecting process, a certain number of tracer agents are injected into a gas-injection well along with air, the injected tracer agents in the stratum flow to surrounding production wells along with the air and are exploited out of the ground with fireflood flue gases to be detected through a detecting instrument, and then the movement situation of the air in the stratum and the communication situations among the wells are analyzed; the tracer agent detecting instrument is a special portable tracer agent infrared detector or a gas chromatograph provided with an appropriate chromatographic column; the usage quantity of the tracer agents is determined according to the gas injection speed of the gas-injection well, the gas injection quantity and the measuring range of the tracer agent detecting instrument.
Description
Technical field
The present invention relates to tracer gas technique detection method between a kind of fireflood well, belong to oil recovery technique field.
Background technology
Fireflood refers to air to inject constantly oil reservoir, then oil reservoir is lighted, and the heat that utilizes oil reservoir burning to produce is realized the multiple displacement mode such as steam flooding, flue gas flooding, thereby improves a kind of thermal recovery mode of oil recovery factor.It is high that fire flood mode has recovery ratio, and energy consumption is little, can again develop the feature of discarded oil reservoir, thereby day by day come into one's own.But, due to fireflood mechanism more complicated, and the non-homogeneity on stratum, in fireflood gas injection process, be easy to occur air fingering, break phenomenon, adopt parameter regulation and control to on-the-spot note and bring larger difficulty, therefore, strengthen the dynamic monitoring dynamics of well group, adopting parameter regulation and control for the dynamic analysis of fireflood effect and note provides data accurately and timely just to seem particularly important.
Tracer Technique is one of high effective means of oozing passage of monitoring oil reservoir.In liquid tracer type, conventional have rhodanate, bromide, iodide, a HTO etc.; In gas tracer type, conventional have tritiated methane, helium, a fluorochlorohydrocarbon class etc.But, due to the high-temperature characteristic (maximum temperature can reach 800 ℃) on fireflood stratum, conventional liq Tracer Technique and gas Tracer Technique or cannot apply, or construction is complicated, monitoring difficulty.Therefore, a kind of high temperature resistant, stable in properties of necessary searching, absorption loss are little, and cheap, construct tracer and detection technique thereof simple, easy to detect, that be applicable to fire flood technology.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides gas tracer method and detection method between a kind of fireflood well.
The object of the invention is provides tracer gas technique detection method between a kind of fireflood well for fire flood technology.
Tracer gas technique detection method between a kind of fireflood well, is characterized in that injecting according to Analysis on monitoring data the parameter such as distribution, air migration direction, migration time of air, thereby can judge live wire burning direction, adopts parameter regulation and control reference and foundation are provided for note.
Tracer gas technique detection method between a kind of fireflood well, contains following steps; Adopt sulfur hexafluoride as gas tracer between fireflood well, in fireflood air injection process, by a certain amount of tracer with air Injection gas injection well, with air, producing well is mobile towards periphery on stratum for the tracer injecting, extraction ground together with fireflood flue gas, then detect with detecting instrument, analyze accordingly air and between migration situation and well, exchange information in stratum; Tracer detecting instrument is tracer special portable formula infrared radiation detection apparatus or the gas chromatograph that is equipped with suitable chromatographic column; Tracer consumption is determined according to gas injection well gas injection speed, gas injection rate and tracer detecting instrument range;
Tracer injection mode can adopt air compressor air intake mouth to inject or well head is followed air Injection mode, and preferably well head is followed air Injection mode; Tracer sampling mode can be producing well sleeve pipe and gets gas sample valve and be directly connected with portable infrared detector, then the automatic air-breathing detection of open detection instrument, or with detecting with portable detector or gas chromatograph after airbag sampling, the sampling period determines according to gas injection speed, tracer injection rate, well spacing and Field Production Data;
Air compressor air intake mouth injection mode is that tracer is connected with air compressor air intake mouth, then discharges tracer according to the concentration that needs of the air-breathing speed of the air of air compressor machine and tracer, and individual-well injection rate is 2-15m3; Well head is followed air Injection mode to refer to tracer is connected with head valve, needs concentration to open reducing valve according to gas injection speed and tracer, follows air to inject equably stratum tracer; In two kinds of injection modes, preferably well head is followed air Injection mode.
Tracer gas technique detection method between a kind of fireflood well, tracer for tracer technique between fireflood well provided by the invention is sulfur hexafluoride, in gas injection well air injection process, by a certain amount of tracer with air Injection shaft bottom, with air, producing well is mobile towards periphery on stratum for the tracer injecting, finally extraction ground together with flue gas, analyzes tracer content in flue gas by portable infrared detector or gas chromatograph, thereby analyzes oil reservoir combustion position and interwell communication situation.
Tracer detection mode of the present invention needs quantitatively to detect, and detecting instrument is portable infrared detector or gas chromatograph.The chromatographic condition of gas chromatograph is according to the difference of chromatographic column and difference, and the detection mode of portable detector is also different.The on-the-spot detecting instrument used of the present invention is portable infrared detector, and sensitivity is that 1ppm, range are 3000ppm, and it is more simple, convenient to operate mutually compared with gas chromatograph.
The tracer consumption that the present invention adopts is determined according to the sensitivity of gas injection well gas injection speed and tracer detecting instrument, and generally, individual-well injection rate is 2-15m
3.
The tracer injection mode that the present invention adopts can be the injection of air compressor air intake mouth or well head is followed air Injection, air compressor air intake mouth injection mode is that tracer is connected with air compressor air intake mouth, then discharges tracer according to the concentration that needs of the air-breathing speed of the air of air compressor machine and tracer; Well head is followed air Injection mode to refer to tracer is connected with head valve, needs concentration to open reducing valve according to gas injection speed and tracer, follows air to inject equably stratum tracer.In two kinds of injection modes, preferably well head is followed air Injection mode, because the method is simpler, convenient.
Producing well sampling mode of the present invention is adopted in two ways, and one is got gas sample valve for production casing and is directly connected with portable infrared detector, the then automatic air-breathing detection of open detection instrument; It two is with detecting with portable detector after airbag sampling.In addition, be divided into a line well, two wires well, three line wells according to producing well apart from the distance of gas injection well, sampling period determines according to gas injection speed, well spacing and Field Production Data, generally sampling period interval is greater than the injection length section of tracer, but should guarantee that a line well at least samples once every day, to guarantee that the very first time monitors tracer, can suitably adjust the sampling period according to testing result simultaneously.The sampling time started of two wires well and three line wells is later than a line well, and the sampling period can be greater than the sampling period of a line well.
The specific embodiment
Obviously the many modifications and variations that, those skilled in the art do based on aim of the present invention belong to protection scope of the present invention.
Embodiment 1: tracer gas technique detection method between a kind of fireflood well, this technology adopts sulfur hexafluoride as tracer, by tracer consumption calculate, tracer injection mode is selected, adopt the steps such as producing well tracer sampling detections implements, according to parameters such as the distribution of Analysis on monitoring data injection air, migration direction, migration times.Tracer that this technology adopts is high temperature resistant, stable in properties, and it is convenient to inject, and stratum background concn is low, and detection sensitivity is high, to personnel and the corrosion-free effect of equipment, is easy to apply.
Tracer gas technique detection method between a kind of fireflood well, adopt sulfur hexafluoride as gas tracer between fireflood well, in fireflood air injection process, by a certain amount of tracer with air Injection gas injection well, with air, producing well is mobile towards periphery on stratum for the tracer injecting, extraction ground together with fireflood flue gas, then detects with detecting instrument, analyzes accordingly air and between migration situation and well, exchanges information in stratum.
Tracer detecting instrument is tracer special portable formula infrared radiation detection apparatus or the gas chromatograph that is equipped with suitable chromatographic column.
Tracer consumption is determined according to gas injection well gas injection speed, gas injection rate and tracer detecting instrument range.
Tracer injection mode can adopt air compressor air intake mouth to inject or well head is followed air Injection mode, and preferably well head is followed air Injection mode.
Tracer sampling mode can be producing well sleeve pipe and gets gas sample valve and be directly connected with portable infrared detector, then the automatic air-breathing detection of open detection instrument, or with detecting with portable detector or gas chromatograph after airbag sampling, the sampling period determines according to gas injection speed, tracer injection rate, well spacing and Field Production Data.
Embodiment 2:
A well is gas injection well, and gas injection speed is 800m
3/ h, 9 mouthfuls of well group producing wells, wherein 6 mouthfuls of wells are produced, and well spacing 50-70m adopts air compressor air intake mouth to inject tracer 6m
3, injection length is 4h, in well group, the producing well sampling period is decided to be 8h.B well detects that tracer concentration is 12ppm in the complete 24h rear pass gas of construction, and after this shortening the sampling period is 4-6h, detects that tracer concentration raises gradually, after 40h, tracer concentration reaches peak value, is 237ppm, then tracer concentration starts to decline, and after 10d, can't detect.C well and D well start to detect respectively tracer after 32h and 48h, and after this tracer concentration maintains between 8-50ppm, continue 7d left and right, and other 3 mouthfuls of wells do not detect tracer.Also 5-70ppm tracer not etc. after 3d, detected at two wires well, the three line wells of other well groups of A well-B well direction.These data declarations A well air break through is 1d left and right, and has channeling direction is mainly A well-B well direction, and other the 3 mouthfuls wells that tracer do not detected are smooth sea and the well of gas injection well A well or do not involve well, involved by other gas injection wells.
Embodiment: 3:
A ' well is gas injection well, and gas injection speed is 500m
3/ h, 8 mouthfuls of well group producing wells, wherein 7 mouthfuls of wells are produced, and well spacing 50-70m adopts well head to follow air mode to inject tracer 4m3, and injection length is 2h, and in well group, the producing well sampling period is decided to be 6h.B ' well detects that tracer concentration is 9ppm in the complete 56h rear pass gas of construction, and after this extending the sampling period is 12h, detects that tracer concentration raises gradually, after 4d, tracer concentration reaches peak value, is 129ppm, then tracer concentration starts to decline, and after 15d, can't detect.C ' well, D ' well, E ' and F ' well start to detect respectively tracer after 4-6d, and after this tracer concentration, between 5-80ppm, continue 15d left and right, and other 2 mouthfuls of wells does not detect tracer.Also 5-40ppm tracer not etc. after 5d, detected at the two wires of other well groups well, three line wells.These data declarations A ' well air break through is 56h left and right, and in well group, producing well is subject to effect better, and gas channeling phenomenon is not serious.
As mentioned above, embodiments of the invention are explained, but as long as not departing from fact inventive point of the present invention and effect can have a lot of distortion, this will be readily apparent to persons skilled in the art.Therefore, within such variation is also all included in protection scope of the present invention.
Claims (4)
1. a tracer gas technique detection method between fireflood well, is characterized in that injecting according to Analysis on monitoring data the parameter such as distribution, air migration direction, migration time of air, thereby can judge live wire burning direction, adopts parameter regulation and control reference and foundation are provided for note.
2. tracer gas technique detection method between a kind of fireflood well according to claim 1, it is characterized in that adopting sulfur hexafluoride as gas tracer between fireflood well, in fireflood air injection process, by a certain amount of tracer with air Injection gas injection well, with air, producing well is mobile towards periphery on stratum for the tracer injecting, extraction ground together with fireflood flue gas, then detects with detecting instrument, analyzes accordingly air and between migration situation and well, exchanges information in stratum; Tracer detecting instrument is tracer special portable formula infrared radiation detection apparatus or the gas chromatograph that is equipped with suitable chromatographic column; Tracer consumption is determined according to gas injection well gas injection speed, gas injection rate and tracer detecting instrument range;
Tracer injection mode can adopt air compressor air intake mouth to inject or well head is followed air Injection mode, and preferably well head is followed air Injection mode; Tracer sampling mode can be producing well sleeve pipe and gets gas sample valve and be directly connected with portable infrared detector, then the automatic air-breathing detection of open detection instrument, or with detecting with portable detector or gas chromatograph after airbag sampling, the sampling period determines according to gas injection speed, tracer injection rate, well spacing and Field Production Data;
Air compressor air intake mouth injection mode is that tracer is connected with air compressor air intake mouth, then discharges tracer according to the concentration that needs of the air-breathing speed of the air of air compressor machine and tracer, and individual-well injection rate is 2-15m
3; Well head is followed air Injection mode to refer to tracer is connected with head valve, needs concentration to open reducing valve according to gas injection speed and tracer, follows air to inject equably stratum tracer; In two kinds of injection modes, preferably well head is followed air Injection mode.
3. tracer gas technique detection method between a kind of fireflood well according to claim 2, it is characterized in that tracer is sulfur hexafluoride, in gas injection well air injection process, by a certain amount of tracer with air Injection shaft bottom, with air, producing well is mobile towards periphery on stratum for the tracer injecting, finally extraction ground together with flue gas, analyzes tracer content in flue gas by portable infrared detector or gas chromatograph, thereby analyzes oil reservoir combustion position and interwell communication situation;
Tracer detection mode is quantitatively to detect, and detecting instrument is portable infrared detector or gas chromatograph; The chromatographic condition of gas chromatograph is according to the difference of chromatographic column and difference, and the detection mode of portable detector is also different; Detecting instrument is portable infrared detector, and sensitivity is that 1ppm, range are 3000ppm;
Tracer consumption is determined according to the sensitivity of gas injection well gas injection speed and tracer detecting instrument, and individual-well injection rate is 2-15m
3;
Tracer injection mode can be the injection of air compressor air intake mouth or well head is followed air Injection, air compressor air intake mouth injection mode is that tracer is connected with air compressor air intake mouth, then discharges tracer according to the concentration that needs of the air-breathing speed of the air of air compressor machine and tracer; Well head is followed air Injection mode to refer to tracer is connected with head valve, needs concentration to open reducing valve according to gas injection speed and tracer, follows air to inject equably stratum tracer; In two kinds of injection modes, preferably well head is followed air Injection mode;
Producing well sampling procedure is adopted in two ways, and one is got gas sample valve for production casing and is directly connected with portable infrared detector, the then automatic air-breathing detection of open detection instrument; It two is with detecting with portable detector after airbag sampling; In addition, be divided into a line well, two wires well, three line wells according to producing well apart from the distance of gas injection well, sampling period determines according to gas injection speed, well spacing and Field Production Data, sampling period interval is greater than the injection length section of tracer, but should guarantee that a line well at least samples once every day, to guarantee that the very first time monitors tracer, can suitably adjust the sampling period according to testing result simultaneously; The sampling time started of two wires well and three line wells is later than a line well, and the sampling period can be greater than the sampling period of a line well.
4. according to tracer gas technique detection method between a kind of fireflood well described in claim 2 or 3, it is characterized in that
A well is gas injection well, and gas injection speed is 800m
3/ h, 9 mouthfuls of well group producing wells, wherein 6 mouthfuls of wells are produced, and well spacing 50-70m adopts air compressor air intake mouth to inject tracer 6m
3, injection length is 4h, in well group, the producing well sampling period is decided to be 8h; B well detects that tracer concentration is 12ppm in the complete 24h rear pass gas of construction, and after this shortening the sampling period is 4-6h, detects that tracer concentration raises gradually, after 40h, tracer concentration reaches peak value, is 237ppm, then tracer concentration starts to decline, and after 10d, can't detect; C well and D well start to detect respectively tracer after 32h and 48h, and after this tracer concentration maintains between 8-50ppm, continue 7d left and right, and other 3 mouthfuls of wells do not detect tracer; Also 5-70ppm tracer not etc. after 3d, detected at two wires well, the three line wells of other well groups of A well-B well direction; These data declarations A well air break through is 1d left and right, and has channeling direction is mainly A well-B well direction, and other the 3 mouthfuls wells that tracer do not detected are smooth sea and the well of gas injection well A well or do not involve well.
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Cited By (4)
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| CN104594887A (en) * | 2014-12-01 | 2015-05-06 | 中国石油天然气股份有限公司 | Reagent, application and equipment for detecting whether oil layer enters high-temperature oxidation stage or not |
| CN106065773A (en) * | 2016-07-21 | 2016-11-02 | 中国海洋石油总公司 | A kind of gas well liquid loading tubing string leakage detection method based on gas tracer |
| 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 |
| CN115450594A (en) * | 2022-09-22 | 2022-12-09 | 中国矿业大学 | Gas injection displacement effect detection method |
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| 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 |
| CN115450594A (en) * | 2022-09-22 | 2022-12-09 | 中国矿业大学 | Gas injection displacement effect detection method |
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