CN102383788B - Underground reservoir porosity measurement method during drilling - Google Patents
Underground reservoir porosity measurement method during drilling Download PDFInfo
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- CN102383788B CN102383788B CN201110274887XA CN201110274887A CN102383788B CN 102383788 B CN102383788 B CN 102383788B CN 201110274887X A CN201110274887X A CN 201110274887XA CN 201110274887 A CN201110274887 A CN 201110274887A CN 102383788 B CN102383788 B CN 102383788B
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Abstract
The invention relates to an underground reservoir porosity measurement method during drilling. When a drilling time meter, a gas logging apparatus, a comprehensive logging meter, a drilling instrument and other logging devices are used for collecting and recording logging drilling time, a reservoir porosity measurement value during drilling POR is determined by a cover layer drilling time ROPn, a reservoir drilling time ROPs, a cover layer reference porosity PORb and an area ground surface incompact formation porosity PORa. A ratio RROP of the cover layer drilling time ROPn and the reservoir drilling time ROPs is used for evaluation of the reservoir. The evaluation result is shown to users or supplied to the users through the internet so that the users can evaluate the property of the reservoir and reservoir fluid. The underground reservoir porosity measurement method during drilling is convenient to use on site, easy to operate, wide in application range and reliable in results. The absolute value of relative error is less than or equal to 15%, and the absolute value of absolute error is less than or equal to 2%. The underground reservoir porosity measurement method during drilling can meet the requirement for logging evaluation reservoir and judging the property of reservoir fluid.
Description
Technical field
Patent of the present invention relates to a kind of underground reservoir porosity measurement method during drilling.Be mainly used in boring, measuring in real time the subsurface reservoir degree of porosity in drilling well and well logging process, for evaluating reservoir provides the explanation key parameter.
Background technology
In geology and petroleum exploration and development drilling well, mud logging service process, generally all need interval of interest or exist oil/gas show well section to carry out Quantitative Evaluation of Reservoirs, may existing and Reservoir levels of judgement reservoir, and in conjunction with other hydrocarbon content parameter, properties of fluid in bearing stratum is differentiated, for the exploration and development decision-making provides foundation.
In drilling well, mud logging service process, measure the subsurface reservoir degree of porosity three kinds of modes are arranged, the one, utilize LWD instrument DHM-MWD, the 2nd, utilize landwaste or rock core in ground survey, the 3rd, utilize the dc index of comprehensive logging instrument record, Sigma value to calculate formation porosity with boring.
The LWD instrument has generally been integrated conventional density, neutron, acoustic logging, external advanced LWD instrument also has the nuclear magnetic resonance log function, when the abundant hydrocarbon information in stratum can be provided in the measurement while drilling process, can also provide the downhole in reservoir degree of porosity with brill.Because measuring apparatus has a segment distance apart from drill bit, be generally 9m to 18m, than the real stratum of boring of drill bit, to lag behind, and also expensive, complicated operation, can't all be used at all drilling wells, well logging scene.
The rock core that utilization obtains from landwaste or the drilling and coring delivery on Shang Fanzhi ground, down-hole with drilling fluid, in logging equipment room, well site, measure reservoir porosity by the nuclear magnetic resonance logging instrument, than the LWD measurement result, more lag behind, but advantage is repeated multiple timesly to measure.
The logging devices such as instrument, mud logging unit during both at home and abroad with brill comprehensive logging instrument, brill, and drilling parameter recording instrument, all record while boring, the pressure of the drill, rotary speed and property of drilling fluid data, comprehensive logging instrument can pass through dc index, the definite formation porosity of Sigma value.The dc index method is applicable to the sand shale stratum, and Sigma value method is applicable to carbonate formation.These relevant methods relate to drilling well, logging parameters is numerous, complicated operation, and influence factor is many, and on-the-spot the use has more limitation.
Summary of the invention
The objective of the invention is for above-mentioned present situation, aim to provide that a kind of cost is low, wide accommodation, method be easy, can be with boring the underground reservoir porosity measurement method during drilling of measuring in real time.
The implementation of the object of the invention is, a kind of underground reservoir porosity measurement method during drilling, instrument, mud logging unit, comprehensive logging instrument, drilling instrument and other logging device collection and when recording well logging and boring when boring, during described brill, that drill bit creeps into the 1m time used, dimension is min/m, and during brill, gathering and record step-length is 1 point/m～1 point/0.1m, and concrete steps are as follows:
ROPs while 1) reading the reservoir brill, get the minimum virtual value of reservoir, data while rejecting the brill that the impact of making up a joint, make a trip is arranged,
While 2) choosing the cap rock brill of reservoir top 5m to 20m, at first ask for initial average output value ROPn1, then reject when being more than or equal to 1.5 times of initial average output value or being less than or equal to the cap rock brill of 0.5 times average ROPn2 while again asking for these cap rocks brills, ROPn when choosing this value ROPn2 and boring as cap rock
3) chosen area earth's surface compacted formation degree of porosity PORa not,
Chosen area interpretation parameter, regional interpretation parameters comprise not compacted formation degree of porosity PORa of earth's surface, basin, and PORa chooses according to basin mud stone, limestone Compaction Law, and span is 40.0%～60.0%;
4) according to basin cap rock criteria for classification, choose the reservoir cap rock with reference to degree of porosity PORb, span is 1.0%～15.0%, one class cap rock, PORb=1%, two class cap rocks, PORb=3%, two class cap rocks, PORb=5%, the like to 15%,
While 5) utilizing above-mentioned brill and following formula determine reservoir porosity POR:POR=PORa-[(PORa-PORb) * LgROPs/LgROPn,
In formula: PORa=40.0%～60.0%; PORb=1.0%～15.0%,
Ratio while 6) boring, when while utilizing cap rock to bore, ROPn and reservoir bored, the ratio R ROP of ROPs carried out evaluating reservoir, RROP >=4, evaluating reservoir has been reservoir or high pressure reservoir; 4>RROP >=2, evaluating reservoir are medium reservoir; 2>RROP >=1.2, evaluating reservoir is poor reservoir; 1.2>RROP, be non-reservoir.
Other logging device collection such as instrument, mud logging unit, comprehensive logging instrument and when recording well logging and boring when the present invention utilizes existing brill, ROPs when ROPn, reservoir brill while boring by cap rock, cap rock with reference to degree of porosity PORb, regional earth's surface not compacted formation degree of porosity PORa determine reservoir porosity measurement while drilling value POR.When while utilizing cap rock to bore, ROPn and reservoir bored, the ratio R ROP of ROPs carried out evaluating reservoir, and evaluation result is shown to the user or offers the user by network, estimates reservoir and properties of fluid in bearing stratum for the user.More timely in the ground survey result than LWD measurement result, landwaste or rock core, cost is lower.Than dc index, Sigma value, determine that the method for formation porosity is easier, accommodation is wider, and result is more reliable.
The invention provides that a kind of scene is easy to use, simple to operate, wide accommodation, reliable results, the absolute value of relative error is not more than 15%, and the absolute value of absolute error is not more than 2%.The present invention can meet the needs that well logging is estimated reservoir and discrimination of reservoir fluid properties.
The accompanying drawing explanation
Fig. 1 is fundamental diagram of the present invention,
Fig. 2 is the specific embodiment of the present invention figure.
The specific embodiment
With reference to Fig. 1, the present invention utilizes comprehensive logging instrument, the logging devices such as instrument, mud logging unit while boring, when when the reservoir of measurement while drilling bored, ROPs and the cap rock (non-reservoir) adjacent with reservoir bored average ROPn and earth's surface with provincial characteristics not compacted formation degree of porosity PORa, reservoir cap rock with reference to degree of porosity PORb data, through POR=PORa-[(PORa-PORb) * LgROPs/LgROPn calculating, draw with boring and measure in real time reservoir porosity POR value under the drilling well of drill bit institute.The POR value is called again gas and surveys degree of porosity, reaction be the reservoir total porosity.
During brill, instrument, mud logging unit, comprehensive logging instrument, drilling instrument and other logging device adopt existing drilling well, mud logging equipment.While gathering and recording the well logging brill, be that drill bit creeps into the 1m time used, dimension is min/m, and during brill, gathering and record step-length is 1 point/m～1 point/0.1m, common 1 point/m or 1 point/0.5m.
Below with reference to Fig. 2 in detail concrete steps of the present invention are described in detail:
ROPs (min/m) while 1) reading the reservoir brill, get the minimum virtual value of reservoir, data while rejecting the brill that the impact of making up a joint, make a trip is arranged,
Described single 1 drilling rod that refers to.After 1 rod boring is complete, need stops brill and connect other 1 drilling rod; Namely need more bit change or adjustment operation, as carry out wireline logging etc., need to pull out of hole, lower brill after the task after the operation adjustment completes.What the impact that makes up a joint, makes a trip referred to is exactly to pull out of hole, operation adjustment impact.
While 2) choosing the cap rock brill of reservoir top 5m to 20m, at first ask for initial average output value ROPn1, then reject and be more than or equal to 1.5 times of initial average output value or be less than or equal to the cap rock of 0.5 times while boring, average ROPn2 when again asking for these cap rocks and boring, ROPn when choosing this value ROPn2 and boring as cap rock.
3) chosen area earth's surface compacted formation degree of porosity PORa not.
Chosen area interpretation parameter.Regional interpretation parameters comprises not compacted formation degree of porosity PORa of earth's surface, basin, and PORa chooses according to basin mud stone, limestone Compaction Law, and span is 40.0%～60.0%.
4) according to basin cap rock criteria for classification, choose the reservoir cap rock with reference to degree of porosity PORb, span is 1.0%～15.0%, one class cap rock, PORb=1%, two class cap rocks, PORb=3%, three class cap rocks, PORb=5%, the like to 15%.
While 5) utilizing above-mentioned brill and following formula determine reservoir porosity POR:POR=PORa-[(PORa-PORb) * LgROPs/LgROPn.
In formula: PORa=40.0%～60.0%; PORb=1.0%～15.0%.
When when 6) reservoir bored, ratio R ROP cap rock bored, ROPn and reservoir bored, ratio calculating method and evaluating reservoir, the multi-parameter of ROPs were explained.It is characterized in that: RROP=ROPn/ROPs; RROP >=4, evaluating reservoir have been reservoir or high pressure reservoir; 4>RROP >=2, evaluating reservoir are medium reservoir; 2>RROP >=1.2, evaluating reservoir is poor reservoir; 1.2>RROP, stratum is non-reservoir.
7) output measurement result.The reservoir porosity measurement result is offered to the user, estimate reservoir and properties of fluid in bearing stratum for the user.
8) on collection or process software, increase the formation porosity that some program codes can be measured each step-length automatically, comprise reservoir porosity.
Claims (3)
1. underground reservoir porosity measurement method during drilling, while it is characterized in that when boring instrument, mud logging unit, comprehensive logging instrument, drilling instrument and other logging device collection and recording well logging boring, during described brill, that drill bit creeps into the 1m time used, dimension is min/m, during brill, gathering and record step-length is 1 point/m～1 point/0.1m, and concrete steps are as follows:
ROPs while 1) reading the reservoir brill, get the minimum virtual value of reservoir, data while rejecting the brill that the impact of making up a joint, make a trip is arranged,
While 2) choosing the cap rock brill of reservoir top 5m to 20m, at first ask for initial average output value ROPn1, then reject when being more than or equal to 1.5 times of initial average output value or being less than or equal to the cap rock brill of 0.5 times average ROPn2 while again asking for these cap rocks brills, ROPn when choosing this value ROPn2 and boring as cap rock
3) chosen area earth's surface compacted formation degree of porosity PORa not,
Chosen area interpretation parameter, regional interpretation parameters comprise not compacted formation degree of porosity PORa of earth's surface, basin, and PORa chooses according to basin mud stone, limestone Compaction Law, and span is 40.0%～60.0%;
4) according to basin cap rock criteria for classification, choose the reservoir cap rock with reference to degree of porosity PORb, span is 1.0%～15.0%, one class cap rock, PORb=1%, two class cap rocks, PORb=3%, three class cap rocks, PORb=5%, the like to 15%,
While 5) utilizing above-mentioned brill and following formula determine reservoir porosity POR:POR=PORa-[(PORa-PORb) * LgROPs/LgROPn,
In formula: PORa=40.0%～60.0%; PORb=1.0%～15.0%,
Ratio while 6) boring, when while utilizing cap rock to bore, ROPn and reservoir bored, the ratio R ROP of ROPs carried out evaluating reservoir, RROP >=4, evaluating reservoir has been reservoir or high pressure reservoir; 4>RROP >=2, evaluating reservoir are medium reservoir; 2>RROP >=1.2, evaluating reservoir is poor reservoir; 1.2>RROP, be non-reservoir.
2. a kind of underground reservoir porosity measurement method during drilling according to claim 1, while it is characterized in that boring, gathering and record step-length is 1 point/m～1 point/0.1m.
3. a kind of underground reservoir porosity measurement method during drilling according to claim 2, while it is characterized in that boring, gathering and record step-length is 1 point/m or 1 point/0.5m.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102748004B (en) * | 2012-06-06 | 2015-08-05 | 中国石油化工股份有限公司 | The defining method of mud logging hydrocarbon saturation |
| CN102748016B (en) * | 2012-07-10 | 2014-10-08 | 中国石油大学(华东) | Geologic history period sandstone reservoir porosity evolution recovery method |
| CN102900432B (en) * | 2012-10-31 | 2016-01-20 | 中国石油集团川庆钻探工程有限公司 | Method for evaluating reservoir by calculating logging porosity while drilling through data during micro-drilling |
| CN106150449B (en) * | 2015-04-22 | 2018-08-17 | 中国石油化工股份有限公司 | A kind of recognition methods of fluid properties for the open oil-gas reservoir of carbon dioxide intrusion |
| CN108412488B (en) * | 2018-03-13 | 2021-09-10 | 中石化石油工程技术服务有限公司 | Logging method for rapidly determining organic porosity of shale gas reservoir |
| CN112727440B (en) * | 2021-01-11 | 2022-02-01 | 西南石油大学 | Reservoir identification method of fracture-cavity oil and gas reservoir based on drilling time data |
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| US6885942B2 (en) * | 2003-01-09 | 2005-04-26 | Schlumberger Technology Corporation | Method to detect and visualize changes in formation parameters and borehole condition |
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