GB2389380A - Rapid characterisation of lithology at the head of a drilling tool - Google Patents
Rapid characterisation of lithology at the head of a drilling tool Download PDFInfo
- Publication number
- GB2389380A GB2389380A GB0309969A GB0309969A GB2389380A GB 2389380 A GB2389380 A GB 2389380A GB 0309969 A GB0309969 A GB 0309969A GB 0309969 A GB0309969 A GB 0309969A GB 2389380 A GB2389380 A GB 2389380A
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- United Kingdom
- Prior art keywords
- well
- formation
- drilling
- nature
- property
- Prior art date
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- Granted
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 88
- 238000012512 characterization method Methods 0.000 title 1
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 82
- 239000012530 fluid Substances 0.000 claims abstract description 49
- 238000005259 measurement Methods 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims description 23
- 239000000126 substance Substances 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 2
- 241000125205 Anethum Species 0.000 claims 1
- 230000000630 rising effect Effects 0.000 claims 1
- 238000005755 formation reaction Methods 0.000 abstract description 73
- 230000003993 interaction Effects 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 229930195733 hydrocarbon Natural products 0.000 description 7
- 150000002430 hydrocarbons Chemical class 0.000 description 7
- 239000000203 mixture Substances 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 244000269722 Thea sinensis Species 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- KHOITXIGCFIULA-UHFFFAOYSA-N Alophen Chemical compound C1=CC(OC(=O)C)=CC=C1C(C=1N=CC=CC=1)C1=CC=C(OC(C)=O)C=C1 KHOITXIGCFIULA-UHFFFAOYSA-N 0.000 description 1
- 101100511466 Caenorhabditis elegans lon-1 gene Proteins 0.000 description 1
- 244000180577 Sambucus australis Species 0.000 description 1
- 235000018734 Sambucus australis Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 210000000050 mohair Anatomy 0.000 description 1
- KRTSDMXIXPKRQR-AATRIKPKSA-N monocrotophos Chemical compound CNC(=O)\C=C(/C)OP(=O)(OC)OC KRTSDMXIXPKRQR-AATRIKPKSA-N 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/005—Testing the nature of borehole walls or the formation by using drilling mud or cutting data
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The nature of the formation 11 at the bottom of well 8 is determined as the well is drilled by taking measurements of the drilling fluid inside 22 and outside 24 of the drillstring 2. Differences between the pairs of measurements reflect interaction between the formation and the drilling fluid. Sensors 26 measure one or more physicochemical properties of the drilling fluid in the drillstring and sensors 28 measure the same properties as the fluid circulates back up the borehole. Both sets of sensors are located close to the drilling tool 14 to minimise the time delay between drilling across a change in lithology and the change being detected. Communication device 10 transmits the measurements to a receiver 16 at the surface. Tertiary sensors 30 may also be located close to the drilling tool to survey the drilled formations directly. Predetermined charts can be used to allow rapid classification of each new formation encountered.
Description
METHOD AND DEVICE FOR DETERMINING T}lE: NATURE OF A FORMATION AT THE HEAD
OF A DRILLING TOOL
TECHNICAL FIELD
Ins invent) can is related to the i- aid of me' hods and dev ces for deter.nining the nature of the formation a L the head Cal a drill ing sol. Acre specify tally, the ir;7ention ^r ce.rr R r eT h: us Arid he- i e: to,- Jets -hi - ing the,,t;rc a.: & forma. Jon at Lee well bottom during dell ir.g operas ens, s as to be able to adapt the dri 1 ling tea rectory in relation to the results obtained.
PRIOR STATE OF THE ART
v When do ring, i t is preen -able to be able Lo bring data on the formation located around the bottom of -: he reel t?-c to the ground surface as f fist as rt:.r.C:;i he Cal.
In of 1ect, by aeterinir.g as quickly as possible he nature of the formation at the;eve of the drilling tool 5 pos_ticned at the bottom end of a drill string, it s opti orally possible to alter the direct or of the drilling tool so teat it moves into an. area rich in hydrocarbons, or qu te simply to pT event the tool from moving toward formations basically containing water.
20 In thi s technical f geld, several implementations have al ready been proposed.
In general, the drilling of a wel ' is performed using a drilling tool caused to rotate with a dry 31 string. The 1 after i s made up of an assembly of hollow rods screwed 25 one to another. A drilling fluid circulating within the well from inside to outside the drill string, also called arillir.c mud, is used in particular for cooling and lubricating the drilling tool, and more particularly for removing formation debris cut away by the drilling tool.
Concernr.g the removal function of formation debris of away by the drilling tool, a first type of method for determining the nature of a formation at the bottom of a we:l, is known. Basica ly, this method consists of and ysing the composition of the drilling fluid when it has carried out a complete cycle within the well, arid it has red bed ground level.
S,r:-e t:ho drilling fluid is extracted CGMt nuously from the well, automat) or manual collection of samples C c' Lois I1U G is conducted on the surface. These samples ore used to perform tests so as to determine one or more physicochemical properties of the constituent formation of We bottom of the well, by analysing, for example, some of the debris extracted from the fluid derived directly from 5 the formation through which the drilling tool has cut.
Nevertheless, th Or, yore Gal method has a r,ajor drawback. connection with drilling depth, which is often cor.sderable possibly reaching several kilometres.
Where the drill ng fluid is discharged from the drill 20 siring at the level of the drilling tool, it takes in debris derived from the formation through which the tool has drilled and then moves back towards ground level. In very deep wells, the fluid containing the debris able to provide information on the nature of the drilled formation 25 sometimes only reaches ground level some hours after passing through the drilling tool. Consequently, the information does not reach ground level fast enough '-or its real time use in adapting the drilling trajectory.
A second type of method is also known for determining 30 the nature of a formation at the bottom of a well.
In this type of method, measuring means are assembled on the drill string in the vicinity of the drilling tool.
It is to be specifies that the distance between the drilling tool and the measuring means is sufficient to
prevent any Gamage to the measuring means since the latter s subjected to impacts and vibrations caused partly by the dr]ng too]. L:ue to the r.onexister.ce GAIL ss.i_fact:oy rrect-anical prc.ection, ii is the] el' r: -:-ec::mmende that the meas,urlr,g means be nstalea a certain distance away from the drilling tool. By way of example, the measuring means are usually positioned >,A,r.,matc y tent or twenty me res Groom he dry lTng, o., or at an e:.en greater distance. 'the measur rg means may be i.) of any kind. Means are known which eriab e 'Loagino While r;ling' echr.iques, which may, for example, measure the res-stvi y or the nuclear density of the formations Jiggled by the drilling tool.
In one such method, the data measurec is generally transit tec JO ground leve],.:s.ng sound waves, which makes ii a. s-b' G to correct the foci fact '' 'r! Of -illl.-, f necessary, almost instantaneously after the measurement RcS been Taken.
However, one essential drawbac.< remains at the tire : of mplemer.ting th s type of method.
While ii is true that the transmission Of the physicochemical data measured is very fast, these da a nevertheless concern physicochemical properties relating to the formations located at the level of the measuring i'., means. On this account, the measurements made do not concern the formation forming the bottom of the well directly in contact with the drilling tool, but only concern the formation or formations located at some dens of metres, even at over one hundred metres above the 33 bottom of the well.
Consequently, when information on a physicochemical property of a formation reaches the ground surface, the drilling tool is already quite distant from that formation. Therefore, the drilling tool may be located in
a format,cr having a totally different nature Lo that Cal the formation for which data is available. In such event, the Contact. of the drilling tool with a host le form&ton would not be noted at ground level anti some rime -, afterwards, which may be as long as several hours.
Furthermore, this drawback is even more restrictive wi-ten hydrocarbonrich formations are not very thick, for example, just a fee mattes deep, with the margin of ert7 in the drilling trajectory then becoming more restr ctec.
2'0 The Methods of the prior art using conventional
drill ng fluids therefore do not provide real time information on the physicochemlcal properties of the Tormation at the bottom of the well.
This situation not only causes substantial extra 15 drilling costs through a non-optimised drilling r&,r chop: knit also adu' Hi oral costs due to the drill_..
equipment used. Since a formation rich in hydrocarbons is generally in contact with an underlying formation mainly made up by water, it a drilling tool mistakenly reaches a Or! water source, the hydrocarbons come into contact with and are mixed with the water. This then causes the formation of a hydrocarbon/water mixture making the material to be extracted from the well considerably heavier. One possible consequence of this trajectory error is to make the well 25 non-eruptive, requiring heavy pum-type means to pump out the hydrocarbon/water mixture from the well, together with costly means for separating the water from the hydrocarbons and re-injecting the water into the ground.
Also, it is to be pointed out that the lack of real 30 time control over the drilling trajectory may also represent a major explosion risk, should the drilling Cool perforate a cavity containing gas under heavy pressure.
SUMMARY OF THE INVENTION
The purpose of the invention its therefore to present a method an: a device for deterrriin.ing the r,ature of a fo'-maio-n Al r he Plead c a d:^^ lima tool, t:hereb: ovrcom rho, at leas. in part, the abovedescribed cirawbacks -elating to She implementations of the prior art. lthe preser,t -.-.ve,-.._on also sets out so p::os teethed and device enabling almost real-time delivery of C ilforration or. the forma ion that makes up the boLLor of the gel_ durtrg do fling of the wel.
To achieve these purposes, the subject of the inventiorn.s firstly method for determining the nature of a formation at the bottom of a well whi].e the well is i. being dri] call, the wel' being equ.pped with a dri 1 string fitted.^:. '-_ 1-in_ co1 Gild L led w a drilir.c fluid circle sting within the we from inside to Outside se-d drill s ring. According to the nvention, the method comprises The following steps: 0 differential measurement, between the outside and the inside of the drill string in the v cinity of the dril ing tool, of at least one physicochemical property of the drilling fluid; using the differential measurement to determine the i nature of the formation at the bottom of the well.
Advantsocously, the method according to the invention, allows very fast determination of the nature of the formation that makes up the bottom of the well using a single measurement of an appropriate physicochemical 30 property or properties of the drilling fluid.
-A effect, the time required for the drilling fluid to c rculate between the formation at the bottom of the well, where it takes in deter s, and the measuring means
positioned in the vic city of the drilling too], remains short era; does not. exceed a few minutes.
r,hus, nformatio: is::railah e with which Lo determine the natt.re of the formation at the bottom of the c, well in distinctly quicker manner than with the methods:'{-
he pri OK art.
In addition, with the differential measurement obtained it 1S p::ssiLle Lo overcome variations in measurement due to changes in measuring conditions causecl, 10 for examp e, by a temperature increase in the drilling fluid as a-d when the well increases in depth.
According to a first preferred embodiment, the determination of the nature of the formation at the bottom of the well consists of qualitatively determining at least :.- one physicochemical property of the formation at the bottom,, Of the we l. Ill this way, a simple comparison between the physicochemical properties of the drilling fluid and those of the formation at the bottom of the well, lead to easy determination of the nature of this 2C formation.
Also in a second preferred embodiment of the Invention, provision may also be made so that determination of The nature of the formation at the bottom of the well consists of a quantitative determination of at least one physicochemical property of the formation at the bottom of the well. In this case, in addition to qua itat ve know edge of at least one physicochemical property of the formation at the bottom of the well, it its also possible to deduce the value of these physcochemica 3C properties relative to the formation.
According to a third preferred embodiment of the invention, the determination of the nature of the formation may consist of comparing at least one measured physicoehemical property of the drilling fluid with pre
set values. Advantageous' y, these pre-set yes are able 7-C provide direct informaticn on the net bate or the -at-r,7tio!s encountered by the d-illLrg tool.
It JO be she.-- fief Hat tie method ma; Include a ta-trsns,ission step for the rrsr.s.i ssLor of informat- or.
rror the bottom to the top surface of the well, arci this may be conducted conti.ucusly when drilling.
1\ fur'::ner subject A. the nventi is device for determining the nature of a formation at the bottom o a i";;e,1 whie the well is Heinz drilled, the wail being equipped with a trails str ng fitted with B drilling tool - d f lies' w-th a drilling fluid circulating within the sell from. inside outside said drill string, said device .... somprls.ng primary measurloc; means once secondary measuring means moLnted on the drill string in the vicinity of tree d.--n tool. Acsc-ing t t.-.e Love:., she:^.mary measuring means and the seco.dary measuring mea-,s are Sl- Cable or measuring at least one physicocner,lcal property Of the drilling fluid respectively located 20 outside and inside said chill string, so as to obtain a differed is' measurement of each measured pr.ysicochemca' popery, at least one physic chemical property measured enabling determination of the nature of the forma.lon at the bottom of the well.
Further, the primary measuring means are able to measure at least one of the phys_cochemical properties o he drllllng fluid chosen from among the group comprising impedance, pa, nuclear density, electric voltage and chemical tracers which react with the fluid contained in 3() the formation.
Other characteristics and advantages of the invention -iL1 become apparent in the nonrestrictive description
Given below.
BRIEF DESCRIPTION OF THE DRAWINGS
The description is made with reference to the single
Lgu:-.:wir,a.S:llemt'(- \7j Or t-'llirv; asrl.: comprising a device for determir,irg the nature of a rat formation at the bottom of a we 1 during drilling, according to one preferred embodiment of the invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
With reference to the single figure, a drilling 1 assem:l.y 1 can be sQerl which comprises in particular a drill string 2 car ryinq a drilling tool 14 at its lower ens. The drilling assembly 1 is located inside and is drilling a well 4, being delimited upwards by the ground level 6 and downwards by the well bottom 8 with which the -'? drilling tool 14 is in contact.
The drilling Assembly 1 also comprises a device 9 For determining the nature of a formation il at the bottom 8 OF the well 4, corresponding to the formation 11 located a, She head of the drilling tool 14.
20 In this embodiment, the device 9 includes several parts including a data transmitter 10 and a measuring unit 12, these parts being mounted respect vely one on top of one another on the drill string 2, in the direction leading from the bottom 8 of the we'1 4 to the ground ?- surface level 6, at the level of a lower part 2a of this drill string 2. The measuring unit 12 comprises primary neas.:ring means 26, secondary measuring means 28 and tertiary measuring means 30.
The device 9 also includes a data receiver 16 30 assembled in an upper part 2b of the drill string 2, and cooperating with the data transmitter JO in the lower part 2a Of the drill string 2.
The drilling tool 14 is located in the vicinity of the primary measuring means 26, and preferably in the
vicinity of each of measuring units 26, 28, 30. It is to he.specfied that the average distance 15 between the part of the tool 14 in cortact with the well ho.tom and Or' measu-i.:g rr,eans 26, 2^, 80 is in the crier O; a Few do cr; : metres. This distance 15 could evidently be shorter, but a -
value of approximately one hundred rr.etres seems fully appYop'-ia-e for probe.g measuring mesas 26, 28, 30 from ,c: Grid as caused by dril.ir.g tool 14..
The cir,Jli.na assembly i also includes a dri-'ing i 10 field added continuously frcr. the gro,r!d srfacc level 6
to the ns-de of a exible pipe:0, via a reservoir (not: shown) of cir2llinq fluid 18.
It is be noted tha. the drilling fluid 18 fills a -
CY1inGLj CG1 space 2? inside the drill string 2 anti also a -
l: r ng-shape.i space 24 located between the wall of well 4 Mu tl. Grill Disc A /.. _ When. boring a grill well I, the drilling fluid 18 er.te-s he flexible pipe 2u uncle- pressure as -
schematically outl red by arrow A In the single 'inure.
20 The fluic-i 18 therefore enters space 22 inside the drill -
string 2, then follows the direction of arrow B towards the well bottom, 8.
After passing through the measuring unit 12, he fluid is discharged from the drill string 2 via the 2' drilling tool 14, as shown by arrow C, then it moves up into ing-shaped space 24 located between the well 4 and the drill string 2.
To conduct a drilling operation, the drilling tool 14 is driven with a rotating movement produced by means (not 30 shown) located at ground surface level 6, or by the drilling fluid 18. In addition, the drilling tool 1.4 is also subjected to a translational movement in the direction leading from ground surface level 6 to the well
but on 3, wh-ch enables -t to cross through anc fragment a formaLior 11 formed by we].1 Horton 8.
Formation cuttings (net shown) are creates at well bottom 8, and they are extracted from the we-.1 4 moving up 5 with the drilling fluid]8 into the rng-shaped space 24, as is shown by arrow D in the single figure.: The drilling fluid 18, containing cuttings, is then Expelled from the well ' via a rayed pipe 3= lo ated above the around surface level. 6.
I) According to the invention, the primary measuri.g means 26 and the secondary measuring means 28 are ab]e to measure at least one physicochemical property of the drilling fluid 18 respectively positioned outside and: inside the drill string 2, so as to obtain a differential -
i5 measurement of each measured physicochemical property, at 1 erase ^, n\A,^a,tt,-cd phtyTsicoche't Cal property able to be used to determine the nature of the formation 11 of the bottom 8 of the well 4. -
In his way, a differential measurement is obtained 20 of the physicochemical property of the drilling fluid 18, -
which makes it possible to cope w-th any variations in the physicochemical property which are not due to a change in the nature of formation 11, but which may possibly derive in particular from a change in depth of the well 4. -
25 The measured physicochemical property or properties of fluid]8 circulating in the ring-shaped space 24, may in particular be impedance, pH, nuclear density through measured absorption of gamma-ray photons, or even electric voltage. 30 The measured physicochemical properties of the drilling fluid 18 may evidently be of any kind, provided they give information on the nature of the formation 11 forming well bottom 8. Persons sk l ed in the art are able to determine the appropriate physlcochemical properties of
the irUlCi 18 to be measured, so tI-at the cu t-r.g aebrs mixed with the f]u.ia:& and derived from. the c-l<..lle:.i orma;.lon 1 ma:. rc,ssibl. cause fine halest --ysicoche: al p-opety or rc->ert es to vary; -n to a.. n Lo Lee r.a:re of focrration 1. It is Lo be noted by way <,4 example that it is possible to group format 0!15 =.r.to heed typos Of difler-ent natures, namely fc,rmations which do no -.o:L..i any- hyci>-,carhons, formations contain:! ng $.ydrocaJ-bo,s arch formal ions rot cor.tair.-ng any O.kydro.crb,^,ns arcs< esse...ially formed of water.
rReterrr iratior of the nature Of the to-mat on 1 a+ well r,otorn & may be performed in di fferent ways. Severa-
Refired e.mbodlmerits of the Invention are descr hec Below, if which the primary measuring means 26 and r.he .-, secondary- eaSurl.g means ?8 only Measure one single Why soche.l grope- ELI roe do llg Fluid 1&. These embed mends -.<ay evidently also apply JO cases when a plurals of phys cochemical properties a-e measured.
'rstly, it is Lo be poi.rl.ted out that the measured z:; physicoche,ical property is transmitted flours the primary 26 and secondary 28 measuring means towards the ground surface level 6, v a the data transmitter 10 directly ir.keo to measuring means 26, 28, and via the data receiver:6 cooperating with the transmitter 10. In z5 general, data derived from the transmitter 10 is transmitted by sound waves circular ing in the drilling fluid 18 within the cylindrical space 22 located inside the dril string 2. Data on the measured physicochemical property of the fluid 18 is then analysed at ground 30 surface level 6, preferably in continuous manner during he conducting of a drilling operation.
According to a first preferred embodiment of the invention, the determination of the nature of formation 11 at wel' bottom 8 consists of a qualitative determination
of a pvsicochemical property Of the fcrmatior 11 at well bottom 8. In ether words, the measured pinysicochemcal roper+v of the drilling fluid lq is such that its variatio'> over time can he used to deduce dJ rectly the variat on of a physicochemica] property relating to formation 11 at well bottom 8, the dedu ed variation lo rh-s p>-,ysicochemical property being able to prcvde direr+ ir4^:-ri!-, can chase in Who nature of t.e drilled format ion 1]. Indeed, the variation in t:he chysicochemical JO property of formation 11, such as resistivi y for example, a2lovs detection of changes in the nature of the drilled formations by means of a simple analysis, such as the charge when tool 14 crosses from a formation rich ire hydrocarbons to a formation essentially formed of water.
15 Also, when there is a well-known correlation between the rph:sGochemicl property of the drilling flu -8..d a physicochemical property relating to the Coronation 11, a sample variation in the physicochemica] property of the drillirg fluid 18 can directly provide information on a 20 change in the nature of the formation 11. Consequently very swift deducing can be made of the nature of the ormation 11 located at the head of the drilling tool i4.
According to a second preferred embodiment of the invention, n addition to the qualitative determination of '5 a physicochemlcal property of format on ll at well bottom 8, it is also possible to make provision for this determination to be carried out in quantitative manner.
To do so, global use is made of the same technique as previously with the difference that each measured value Of 30 the phys_cochemical property of fluid 18 is caused to corr-espcnd to a value of the physicochemical property of the dril ed formation 11. It is thus possible to determine more accurately the composition of formation 11 cut by tie drilling tool 14, in particular when the deduced
physicochemical property concerns reslstivity or the dcrsity of' formtior. 11.
Bv Why of example provision may be dada fc r the eti art: mc. asu:-lnc3 means 30 t o meas:e a physics hem- i al property of a frrn.ati,n 33 located at the level of teaser tic: means 12, and more prow sely aT the level of tertiary measuri nq bears 30. None he ess, due to -the I- sra. lcc i exist.. between.'-.e t: Liar y beast r ng means 30 arid he formation 1 at well bottom 8, th,.s value w Al only reach he surface a few hours after the arrival at gr-o:^nd surface level 6 of the value o f he physicocher.rilca2.
proper": a' the drilling fluid 18. Despite this rime lag, ins ter i ary rreasring means 30 are adapr.ed so as t u conduct i egging to indicate the rotation and penetraT - on speeds of too-. 14 and the drilling tea Rectory. In Audi i or., these Lent i c by i;Cl.. TIC an also prcv- we infomatlor On the pl-.ys Biochemical properties Of fomatlcn <3, sue,. as nets ral radicac.ivity, yes sti: i By, ox ever dens by.
20 In order to prevent the tirr,e lag in the measurements mentioned above, t is possible to use other factors to determine the value of the Whys cochemical property Cal ormation ll at well bottom 8. Prior to the dri fling operations, tests may be performed o determine the correl.atiori existing between the values of the physi cochemical property of fluid 18 and the values of the physicochemical property of formation ll at well bottom 8.
It is therefore not necessary to wait for the measurements arriving from the tertiary measur ng means 30 in order to determine the value of the physicochemical property of formation ll cut by tool 14, and faster determination con therefore be made of the nature of this formation ll.
In a third preferred embodiment of the invention, the determination of the nature of for,atlon ll may consist of
sir.:ply comparing the values ob aided for he Whys cochemlca] property of the fluid 18 measured by the pYirnarv ?6, and secondary:8 measur ng means, with presser valves t.:or this same physicochemical property. In this way, ii is no longer obligatory to conduct an intermediate step for determining a physicochemical property Of creation ll. the brevet values of judci ously chosen p',v',, v< Rig.- i'2''';''-'!-t>' fir- l'i-i lo. tray' 'I'm set Afar On graph form, so that the measurement made can s. impy be l() read off- to Mohair direct informaLi.on on the nature of formation 11.
In the method for determining the nature of formation ld at well bottom 8, the primary 26 and secondary measuring means are positioned in the vicinity of the 15 drilling tool and preferably a few dozen metres froth that part of tool 14 i n contact with well bottom Q. Consequently, since the average rise speed of drilling fluid 18 into the ring-shaped space 24 is approximately a few metres per second, the physicochemical property of the 20 fluid 18 containing cutting debris from formation 11 can then be measured less than one minute after the tool 14 has cut through this formation 11. With the information on this physicochemical property being immediately ransmlLted to Ground surface level 6 via transmitter 10 :. and receiver 16, adaptation of the dr1l ing trajectory, by orionting tool 14, can thus be performed very quickly. In this case, between the time when the drilling tool 14 has cuL through a formation and the time when it is possible to determine the nature of this formation, the dril'inc C tool 14 will only have advanced a few centimetres into well bottom S. With such a method, almost total optimization of the drilling tralectory can therefore be considered.
Various modi fixations nay eviciently be made by persors skill ed i n the or t o the rnethoo arch devi he ast described solel y for i ' lsL'ative prpcses and non-
Yes-_ct ivy.
Claims (1)
1..: method for distort sing -e n.atarc of a formstioi-.
at the. bct.tom of a well while the we'1 is being drilled, -he well being equipped with a dill' string fitted wits a d:i31-r.g tool and filled with a drilling fluid circulating 5 wiLhi.n one we11 from inside to outside the drill st.r:ng, i''.' '!!G'..W''' Oi,tp rising -l-, Lllowrg steps: making a differential measurement between We outside and the inside of the dril. string, in the vicinity of the drilling tOO], of at least one physicochemlcal property of 1G the -Irilling fluid; using the differential measurement to determine the nature of Ihe formation at the bottom of the we]1.
2. I. thud ccrvi-.y to claim 1, wherein the determination of the nature of the formation at the bottoms cc the well consists of a qualitative determination of at least one physicochemical property of the formation at the bottom of the well.
2C 3. method according JO claim 1 or claim 2, wherein the deters nation of the nature of formation at the bottom of the we.1 consists of a quantitative determination of at least one physicochemical property of the formation at the bottom of the well.
z5 4. A method according to claim 1, wherein the determination of the nature of formation at the bottom of the well its made by comparison w th pre-set Values.
30 5. F. method according to any of the preceding claims, further comprising a data transmission step, from the bottom of the well towards the surface.
6. A method according to any preceding claim, nereir.
reasremen. -s Trade of at.east one Of the phvsicce.r.^,ic-= p-:p=rte.- Of drilling flick chosen food among t}-.e or^oup made up Of electric.a.. Impedance, pa, nuclear density and electric voltage.
If\ me.hoa according to any precedr!g c air.:, the rnet.hod He 9 implemented continuously due rich do 'sing.
O S. A Device for determining the nature of a formation at the Lot'om of a well while the well is being drilled, Lie well being equipped with a drill sty nG flLted with a dr2i tco2 and filled with a drill-.ng fluid circlla.:r.g i-, w th n the well Boor inside to outs de the drill string, the _-;i-- omprising pr ' wary measu-:nc means and secondary.easurlng means mounted or. the drill string in the v Gin By of the cril.lir.g tool, wherein the Or wary easurir.g means and the secondary measuring means are : so table for measuring a least one physic chemical property of the drilling fluid respectively located inside and outside the drill string so as to obtain a different al measurement of the at least one measured physlcochemica property, the at least one measured zip physicochemical property enabling determinat on of the nature of formation at the bottom of the well.
9. A device according to claim 8, further comprising tertiary measuring means mounted on the drill string in the vicinity of the drilling tool and suitable for measuring at least one physiGocheica1 property of a formation located at the level of the tertiary measuring means.
1C.. device according to claim i, Or Claire 9, further
comprising a data ttans.r;itter on the drill s:.:ing In the vic;ity at the measuring means, and a da a receiver pCSl- i owed at the surface.
r 1. A device according to any one of claims 8 to -0, where.r the prirrcJry and secor-dary measuring means are able Do, r,,c..r rag least Gnu of the pl-,yslco-.l-eml:.c Prices cT the drilling fluid chosen idiom the group comprising LO' impedance, parer nuclear density and electric voll,age.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0205844A FR2839531B1 (en) | 2002-05-13 | 2002-05-13 | METHOD AND DEVICE FOR DETERMINING THE NATURE OF A HEAD FORMATION OF A DRILLING TOOL |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2389380A true GB2389380A (en) | 2003-12-10 |
| GB2389380B GB2389380B (en) | 2004-10-06 |
Family
ID=29286425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0309969A Expired - Fee Related GB2389380B (en) | 2002-05-13 | 2003-05-01 | Method and device for determining the nature of a formation at the head of a drilling tool |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20030209364A1 (en) |
| FR (1) | FR2839531B1 (en) |
| GB (1) | GB2389380B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1911928A1 (en) | 2006-10-09 | 2008-04-16 | Services Pétroliers Schlumberger | Apparatus and method for detecting hydrocarbons in a wellbore during drilling |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB201001833D0 (en) * | 2010-02-04 | 2010-03-24 | Statoil Asa | Method |
| CA2965289C (en) | 2014-12-31 | 2019-03-26 | Halliburton Energy Services, Inc. | Real-time control of drilling fluid properties using predictive models |
| IT201800004117A1 (en) * | 2018-03-30 | 2019-09-30 | Eni Spa | METHOD AND APPARATUS FOR THE CONTINUOUS CHARACTERIZATION OF FORMATION FLUIDS DURING DRILLING |
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| WO1980002053A1 (en) * | 1979-03-26 | 1980-10-02 | Sredneaziat Nii Prirod Gaza | Method of continuous logging of borehole |
| US6176323B1 (en) * | 1997-06-27 | 2001-01-23 | Baker Hughes Incorporated | Drilling systems with sensors for determining properties of drilling fluid downhole |
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| US3800277A (en) * | 1972-07-18 | 1974-03-26 | Mobil Oil Corp | Method and apparatus for surface-to-downhole communication |
| US3885429A (en) * | 1973-11-30 | 1975-05-27 | Mihaly Megyeri | Method for measuring the rheological properties of fluids in the bore holes of deep-wells |
| WO1980001496A1 (en) * | 1979-01-16 | 1980-07-24 | Sredneaziat Nii Prirod Gaza | Method for controlling a drilling mud dispersing process |
| SU904370A1 (en) * | 1979-03-27 | 1983-08-15 | Среднеазиатский научно-исследовательский институт природного газа | Method for controlling properties of drilling mud during circulation |
| US4553226A (en) * | 1980-01-10 | 1985-11-12 | Scherbatskoy Serge Alexander | Systems, apparatus and methods for measuring while drilling |
| US4297880A (en) * | 1980-02-05 | 1981-11-03 | General Electric Company | Downhole pressure measurements of drilling mud |
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| CA2256248A1 (en) * | 1998-12-16 | 2000-06-16 | Kosta Zamfes | Quantification of the characteristics of porous formations while drilling - hydrocarbon saturation index ("hcsi") |
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- 2002-05-13 FR FR0205844A patent/FR2839531B1/en not_active Expired - Fee Related
-
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- 2003-05-01 GB GB0309969A patent/GB2389380B/en not_active Expired - Fee Related
- 2003-05-13 US US10/436,811 patent/US20030209364A1/en not_active Abandoned
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1980002053A1 (en) * | 1979-03-26 | 1980-10-02 | Sredneaziat Nii Prirod Gaza | Method of continuous logging of borehole |
| US6176323B1 (en) * | 1997-06-27 | 2001-01-23 | Baker Hughes Incorporated | Drilling systems with sensors for determining properties of drilling fluid downhole |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1911928A1 (en) | 2006-10-09 | 2008-04-16 | Services Pétroliers Schlumberger | Apparatus and method for detecting hydrocarbons in a wellbore during drilling |
| US7832501B2 (en) | 2006-10-09 | 2010-11-16 | Schlumberger Technology Corporation | Measurement ahead of the drilling bit by analysis of formation cuttings using ultraviolet light to detect the presence of oil or gas |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2839531B1 (en) | 2005-01-21 |
| GB2389380B (en) | 2004-10-06 |
| US20030209364A1 (en) | 2003-11-13 |
| FR2839531A1 (en) | 2003-11-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20150501 |