CN1156473A - Thermally stable oil-base drilling fluid - Google Patents
Thermally stable oil-base drilling fluid Download PDFInfo
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- CN1156473A CN1156473A CN 95194261 CN95194261A CN1156473A CN 1156473 A CN1156473 A CN 1156473A CN 95194261 CN95194261 CN 95194261 CN 95194261 A CN95194261 A CN 95194261A CN 1156473 A CN1156473 A CN 1156473A
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Abstract
An oil-base drilling fluid containing an unsulfonated polymer and/or an inorganophile clunch is capable of holding a desired flowing deformation property under an increased temperature.
Description
Invention field
The present invention relates to oil-based drilling mud or drilling fluid and the system and method that is used in the stratum drilling well.
Oil base drilling fluid and be well known to a person skilled in the art with the technology that reclaims hydrocarbon (gentle) as oil with the drilling well in the stratum of this class I liquid I.These drilling fluids contain oil, weighting agent, tensio-active agent and organophilic clay usually.Five kinds of major functions of oil base drilling fluid are (a) cooling and lubricated drill bit, and (b) drilling cuttings of cleaning borehole bottom (c) is transported to drilling cuttings on the ground, (d) stablizes well bore and (e) creates conditions for suitable formation evaluation.
In some cases, for example, when extracting out in the drill string lower going-into-well or from well, carry out boring log, carry out fishing operation or carrying out other operation in drilling operation course, the drilling fluid in the well keeps stagnating, and its temperature can reach and remain on the bottom temperature a few days.Although this is out of question usually, when oil base drilling fluid remained on the bottom temperature of 176.7 ℃ (350), the organophilic clay in the described liquid can be degraded, and influences the rheological property of drilling fluid unfriendly.Particularly this degraded can reduce the 3rpm rheology value of yield point and drilling fluid.Because the ability of these rheology value representation drilling fluid suspension drilling cuttings and weighting agent, the degraded of organophilic clay make drilling fluid if not impossible also be unlikely to make solid suspension and cause the high drilling problem of cost,, fluid density change sagging as weighting agent, solid precipitation, adhesion drilling pipe, bad clear hole, too much liquid are lost in the stratum and the cementing job of difference.
People have carried out many trials for the degradation problem of the organophilic clay that solves drilling fluid used in high-temperature service.Referring to for example U.S.4425455, U.S.4425461, U.S.4425462, U.S.4447338, U.S.4537688 and SPE 13560, these documents are incorporated herein by reference in full.These researchs make it include one or more sulfonated polymers based on improving the oil base drilling fluid prescription.Yet sulfonated polymers (for example sulfonated ethylene-propylene diene terpolymer (sulfonated EPDM)) is more expensive, and obtains if not impossible also being difficult to.For example, it is believed that sulfonated EPDM (is the existing spendable product of this petroleum industry of not making more than a year of unique known supplier of Tekmud 1949 board sulfonated-EPDM).
Summary of the invention
The present invention uses the composition be easy to get also to use inexpensive polymkeric substance, and selective oil base drilling fluid is provided, described drilling fluid demonstrate surpass 176.7 ℃ (350 °F) if the time unlike the drilling fluid that contains sulfonated polymers rheological property similar with it well arranged also.Particularly, oil base drilling fluid of the present invention contains (i) oil, (ii) weighting agent, (iii) tensio-active agent and (iv) non-sulfonated polymers and or (v) non-organophilic clay.(the used term " non-sulfonated polymers " of this specification sheets and claim is meant that a kind of per 100 gram polymkeric substance contain the polymkeric substance of the following sulfo group of 4 milliequivalents (meq); And term " non-organophilic clay " be meant a kind of still the processing without amine and from the fuel-displaced clay of changing into of water outlet).
In addition, the present invention also provides a kind of well system and method that is used for drilling well.This well system comprises (a) stratum, (b) penetrates the well on stratum, (c) is suspended in the drill bit in the well and (d) places well and be close to the above-mentioned drilling fluid of drill bit.
About boring method of the present invention, this method is included in aforementioned drilling fluid and exists down at the borehole bottom rotary drill bit, to collect drilling cuttings and at least a portion drilling cuttings is carried out well.Detailed Description Of The Invention
Be not subjected to the restriction of any concrete operations theory, we think that oil base drilling fluid of the present invention keeps its rheological property by using non-sulfonated polymers and/or non-organophilic clay etc. through about 176.7 ℃ (350) above aging back.The example of non-organophilic clay includes but not limited to polynite (wilkinite), hectorite, talcum powder, attapulgite and illite, and preferred non-organophilic clay is wilkinite and hectorite.Described non-organophilic clay can be separately or mixing effect.
The organophilic clay that non-organophilic clay was used for oil base drilling fluid relatively in the past has at least two advantages.First, because non-organophilic clay is not handle with amine, they are more cheap than its corresponding organophilic clay.In addition, it is believed that at high temperature that amino disconnects or separates with organophilic clay, produces modified clay, it brings the rheological property of resulting drilling fluid difference.On the contrary, because be to handle with amine by the non-organophilic clay of definition, at high temperature they give the better rheological property of oil base drilling fluid than the organophilic clay Belt of temperature degraded.
The organic polymer that Table I was listed under the example of non-sulfonated polymers comprised.
Table I
The thermoplastic rubber of non-sulfonated polymers kind material; Polyvinyl chloride; Nylon; Fluorocarbon; Linear polyethylene; Urethane;
Polystyrene, poly-(o-methyl styrene), poly-(vinyl toluene), poly-(to methyl
Vinylbenzene), poly-(2, the 4-dimethyl styrene), poly-(2, the 5-dimethyl styrene),
Poly-(to t-butyl styrene), poly-(to chloro-styrene), poly-(alpha-methyl styrene),
Polystyrene, poly-(o-methyl styrene), poly-(vinyl toluene), poly-(to methyl
Vinylbenzene), poly-(2, the 4-dimethyl styrene), poly-(2, the 5-dimethyl styrene),
Poly-(to t-butyl styrene), poly-(to chloro-styrene) and poly-(alpha-methyl styrene)
Each other or with being total to of vinyl cyanide, Vinyl toluene or methyl methacrylate
Polymers or terpolymer; Polypropylene; Acrylic resin (for example vinylformic acid, first
Base vinylformic acid, these sour esters (for example methyl acrylate, ethyl propenoate, propylene
Acid butyl ester, methyl methacrylate, Jia Jibingxisuanyizhi, methacrylic acid fourth
Ester, Propenoic acid, 2-methyl, isobutyl ester, isodecyl methacrylate, methacrylic acid
Ten diester, methacrylic acid 13 esters, stearyl methacrylate, dimethyl propylene
Olefin(e) acid 1,3 butylene glycol ester, trimethylammonium vinylformic acid trishydroxymethyl propyl ester, methacrylic
Acid tertiary butyl amino ethyl ester, Rocryl 410) polymkeric substance or multipolymer),
Or vinyl cyanide; The cellulosic resin (for example, cellulose acetate, carboxymethyl cellulose,
Hydroxy alkyl cellulose (for example Natvosol, Walocel MT 20.000PV)); Polyethylene
Base toluene; Elastomerics (unvulcanized); Polyhutadiene; Polybutene; Polyisoprene;
The heat cured elastomerics of natural rubber (sulfurized); Crosslinked polyethylene; Phenoplast; Synolac; Polyester;
Ethylene-propylene-diene terpolymer (EPDM); Isoprene-isobutylene rubber; Vinylbenzene-
Butadienecopolymer; Chloroprene rubber; Paracril; Thiorubber
The used unvulcanized polymkeric substance of the present invention generally has an appointment 40, and the number-average molecular weight of 000-about 120,000 is about 250, the dispersity of the weight-average molecular weight of 000-about 500,000 and about 3-about 6.(used term " dispersity " is meant the ratio of weight-average molecular weight and number-average molecular weight in this specification sheets and the claim).Preferred non-sulfonated polymers is a polystyrene.
Because it seems that sulfonation strengthen polymer properties used in the drilling fluid of the present invention not obviously, the preferred every 100g polymkeric substance of non-sulfonated polymers contains following, more preferably following, the best sulfo group of about 0meq of following, the further preferred 1meq of 2meq of 3meq.With the monomeric parts by weight of sulfonated, non-sulfonated polymers generally contain be less than about 0.5, preferably be less than about 0.4, more preferably less than about 0.25, further preferably be less than about 0.1, the best sulfonated monomer of about 0 weight part.
The oil, tensio-active agent, weighting agent, shale inhibition salt and the fluid loss control agent that are usually used in the oil base drilling fluid also are suitable in the liquid of the present invention.The example of oil, tensio-active agent and weighting agent for example, has been described among U.S4447338 and the U.S.4425462.In addition, oil can be paraffin oil, the paraffin oil of describing in the U.S. Patent application 08/065644 for example, and the document is incorporated herein by reference in full.
It is basic metal and alkaline earth salt that typical shale suppresses salt.Calcium chloride and sodium-chlor are that preferred shale suppresses salt.
The example of fluid loss control agent includes but not limited to pitch class (as sulfonated bituminous matter and bituminous matter), brown coal, rock asphalt and leonardite.The softening temperature of fluid loss control agent is high as far as possible, and advantage is at least about 148.9 (300), more preferably at least about 176.7 (350).Because its high softening-point, rock asphalt is a kind of preferred fluid loss control agent.The softening temperature of 143.3 ℃ (290)-Yue 204.4 ℃ (400) (the commercially available rock asphalt have an appointment).Leonardite also is a kind of preferred fluid loss control agent.
Selective a kind of sulfonated polymers and/or a kind of organophilic clay of also containing of oil base drilling fluid of the present invention.For example among U.S.4425455, U.S.4425461, U.S.4425462, U.S.4447338, U.S.4537688 and the SPE13560 sulfonated polymers is being described.Because they be it seems and strengthen the rheological property that contains the drilling fluid of non-sulfonated polymers of the present invention, preferably need not or use sulfonated polymers hardly in drilling fluid of the present invention not obviously.Thereby the concentration of the sulfonated polymers in containing the drilling fluid of non-sulfonated polymers is generally less than about 0.143g/m
3(every barrel 0.05 pound (ppb)) is preferably less than about 0.057g/m
3(0.02ppb), be more preferably less than about 0.029g/m
3(0.01ppb), and preferably about 0.
The prescription of oil base drilling fluid of the present invention is shown in down in the Table II:
Table II
A. volume percent is based on the cumulative volume of drilling fluid.B. the used term " tensio-active agent " of this specification sheets and claim is meant a kind of material, when it was present in the system with lower concentration, it had on the surface of the system of being adsorbed onto or the interface and changes the surface on these surfaces (or interface) or the character of interfacial free energy significantly.Definition as the tensio-active agent of front is used, and the interface between any two non-miscible phases represented in term " interface ", and term " surface " expression one is the normally interface during air of gas mutually.The example that is called the composition of tensio-active agent by those skilled in the art comprises emulsifying agent and oil-wetting agent.C. every barrel poundage (ppb) is based on the final composition of drilling fluid.D. the used term " lime " of this specification sheets and claims is meant the unslaked lime (white lime (Ca (OH) for example of unslaked lime (CaO), unslaked lime precursor and hydration
2)).
| Composition | Typically | More typical |
| Oil, volume % a | 25-85 | 40-60 |
| Tensio-active agent b(active), ppb c?????????????????????kg/m 3 | 0.5-40 2.86-57.2 | 3-25 2.86-28.6 |
| Water, volume % a | Maximum 45 | 1-20 |
| Weighting agent, PPb kg/m 3 | Maximum 700 maximum 2002 | 150-600 429-1716 |
| Non-organophilic clay, PPb kg/m 3 | 0.05-15 0.143-42.9 | 0.1-10 0.286-28.6 |
| Non-sulfonated polymers, ppb kg/m 3 | 0.05-15 0.143-42.9 | 0.1-6 0.286-17.16 |
| Organophilic clay, ppb kg/m 3 | Maximum 15 maximum 42.9 | 0.1-6 0.286-17.16 |
| Shale suppresses salt, ppb kg/m 3 | Maximum 60 maximum 171.6 | 5-30 143-85.8 |
| Lime d，ppb ???????kg/m 3 | Maximum 30 maximum 85.8 | 1-20 2.86-57.2 |
| Fluid loss control agent, ppb kg/m 3 | Maximum 30 maximum 85.8 | 2-20 5.72-57.2 |
The character (as water oil ratio, density etc.) that can regulate oil base drilling fluid is to be fit to any drilling operation.For example, drilling fluid of the present invention is mixed with usually and has an appointment 100: the density of about 40: the 60 profit volume ratio of 0-and about 0.9kg/L (per gallon 7.5 pounds (ppg))-Yue 2.4kg/L (20ppg).More typical is that the density of drilling fluid is about 1.1kg/L (9PPg)-Yue 2.3kg/L (19ppg).
In addition, the weight ratio of non-sulfonated polymers and non-organophilic clay is generally about 1: about 4: 1 of 4-, more typical is about 1: about 3: 1 of 3-.Yet when the weight ratio of non-sulfonated polymers and non-organophilic clay is about 1: 2-is in the time of about 2: 1, obtains best, consistent initial and aged yield point and initial and aged 3rpm reading, and all other parameters keep constant.
Equally, with regard to the ratio of non-organophilic clay and organophilic clay, the weight ratio of non-organophilic clay and organophilic clay typically is about 4: about 1: 4 of 1-, and be more typically about 3: about 1: 3 of 1-, when the weight ratio of non-organophilic clay and organophilic clay is about 2: 1 to about 1: 2, obtain best, consistent initial and aged yield point and initial and aged 3rpm reading, all other parameters remain unchanged.
Drilling fluid preferably mixes moiety by following order and prepares: (a) oil, (b) emulsifying agent, (c) lime, (d) fluid loss control agent (e) contains the aqueous solution that water and shale suppress salt, (f) organophilic clay, (g) oil-wetting agent, (h) weighting agent, (i) non-sulfonated polymers and (j) non-organophilic clay.When using sulfonated polymers, it generally added before or after non-sulfonated polymers.
Example
Following example compares the various character of the oil base drilling fluid that exemplifies in the scope of the invention (routine 1-6) and the oil base drilling fluid (comparative example 7) of prior art, and these examples only play illustration and do not limit the present invention, and the present invention is defined by the claims.Example 1-6
Add six kinds of oil base drilling fluids (every clock drilling fluid preparation 3 experiment buckets, every experiment bucket contains about 350ml) of the density of the 2.16kg/L that has an appointment (about 18ppg) in the described one-tenth assignment system scope of the invention in succession by the order of listing by Table A.After adding every kind of composition, before adding the composition of back, mix said composition, the mixing time shown in continuing to resultant composition.
Table A
A.76 the styrene butadiene polymkeric substance of RES 4470 trades mark polystyrene of RES 7116 trades mark b.76
| Example | Mixing time | ||||||
| Composition | ?1 | ?2 | ?3 | ?4 | ?5 | ?6 | Minute |
| Diesel oil, ml | ?164. ?5 | ?164.5 | ?164.5 | ?164.5 | ?164.5 | ?164.5 | |
| The main emulsifying agent of the Invermul NT trade mark, ml | ?8.5 | ?8.5 | ?8.5 | ?8.5 | ?8.5 | ?8.5 | |
| Lime, g | ?8.0 | ?8.0 | ?8.0 | ?8.0 | ?8.0 | ?8.0 | |
| The fluid loss control agent of the Duratone 11T trade mark, g | ?10.0 | ?10.0 | ?10.0 | ?10.0 | ?10.0 | ?10.0 | ????20 |
| Salt brine solution CaCl2, g | ?12.1 | ?12.1 | ?12.1 | ?12.1 | ?12.1 | ?12.1 | ????10 |
| Water, ml | ?23.8 | ?23.8 | ?23.8 | ?23.8 | ?23.8 | ?23.8 | |
| The organophilic clay of Bentone 38 trades mark, g | ?1.0 | ?2.0 | ?3.0 | ?2.0 | ?2.0 | ?1.0 | ????20 |
| The oil-wetting agent of the EZ Mul NT trade mark, ml | ?6.0 | ?6.0 | ?6.0 | ?6.0 | ?6.0 | ?6.0 | ????10 |
| Barium sulfate, g | ?572 | ?572 | ?572 | ?572 | ?572 | ?572 | ????20 |
| The styrene butadiene polymkeric substance a，g | ?0 | ?0 | ?0 | ?0 | ?0 | ?2.0 | ????10 |
| Polystyrene b，g | ?3.0 | ?3.0 | ?3.0 | ?4.0 | ?2.0 | ?3.0 | ????10 |
| Wilkinite, g | ?3.0 | ?3.0 | ?3.0 | ?2.0 | ?4.0 | ?3.0 | ????35 |
The polystyrene of the 76RES7116 trade mark that example 1-6 is used have an appointment 82,000 number-average molecular weight, about 380,000 weight-average molecular weight and about 1,130,000 Z-average molecular weight.The polystyrene of the 76RES7116 trade mark is the product that is designated as Rov.7116 that can obtain from Rohm ﹠ Haas Corp at present.
A sample survey initial rheology matter of the every kind of different drilling fluid preparation that makes among the use-case 1-6.Test two less important aged samples, two parts of samples that are about to various drilling fluid preparations wore out 72 hours.To in the aging bullet form height pressure vessel that about 190.6 ℃ (375) rotate, putting into the weathering test sample in the presence of the nitrogen of about 790.8kpa (100psi).After aging, the denseness of amount that the test upper strata is separating of oil and record drilling fluid.Then with the sample remix of burn-in test and detect their rheological property.Unless indicate in addition among the following table B, measured initial and aging rheological property is according to " working specification-standard step that is used for the recommendation of field assay drilling fluid ", the working specification 13B-2 (RP13B-2) that API recommends, second edition, on December 1st, 1991, american petroleum research institute, Washington, the described step in district of Columbia (hereinafter referred to as " API ") records at about 48.9 ℃ (120 °F), and API is incorporated herein by reference in full.Test result is shown among its B.
Table B
A. " I " expression " initial " b. " A " expression " aged " c. is according to API, the 9-10 page or leaf, and the described step of 2.4 to 2.5 joints is measured, and 115 volts of motor-driven viscometers obtain meter reading.D. according to API, the 10th page, 2.5 to 2.6 save the step of description and the PV that computing method is measured.E. according to API, the 10th page, 2.5-2.6 saves the step of description and the YP that computing method is measured.F. according to API, the 10th page, 2.5 save, 10 seconds and 10 minutes gel strength of the step measurements that f and g section are described.G.HTHP represents " High Temperature High Pressure test ", and according to API, 13-14 page or leaf, the step measurements that the 3rd joint is described.H. " ES " expression " elctrical stability ", and according to API, 21-22 page or leaf, the described step measurements of the 6th joint.I. by decant and the oil reservoir of measuring on the solid be present in the drilling fluid that aging bullet describes the burn-in test in the device measure the separating of oil amount in upper strata.
| Example | ||||||||||||
| Character | ??????1 | ??????2 | ????????3 | ??????4 | ????????5 | ??????6 | ||||||
| ?I a | ?A b | ?I | ??A | ??I | ??A | ??I | ??A | ??I | ??A | ??I | ??A | |
| Meter reading c， | ||||||||||||
| 600rpm， | ?112 | ?128 | ?125 | ??157 | ??149 | ??190 | ??115 | ??154 | ??142 | ??156 | ??160 | ??164 |
| 300rpm， | ?63 | ?69 | ?71 | ??90 | ??89 | ??115 | ??67 | ??87 | ??85 | ??88 | ??87 | ??86 |
| 200rpm， | ?48 | ?50 | ?54 | ??67 | ??71 | ??88 | ??51 | ??67 | ??69 | ??65 | ??70 | ??64 |
| 100rpm， | ?30 | ?29 | ?35 | ??40 | ??46 | ??54 | ??32 | ??40 | ??44 | ??38 | ??44 | ??35 |
| 6rpm， | ?8 | ?6 | ?11 | ??10 | ??14 | ??18 | ??10 | ??12 | ??14 | ??10 | ??14 | ??6 |
| 3rpm， | ?7 | ?6 | ?9 | ??9 | ??12 | ??17 | ??8 | ??11 | ??12 | ??9 | ??13 | ??5 |
| PV d，cp | ?49 | ?59 | ?54 | ??67 | ??60 | ??75 | ??48 | ??67 | ??57 | ??68 | ??73 | ??78 |
| ?????N-sec/m 2(10 3) | ?49 | ?59 | ?54 | ??67 | ??60 | ??75 | ??48 | ??67 | ??57 | ??68 | ??73 | ??78 |
| VP e，1b/100ft 2 | ?14 | ?10 | ?17 | ??23 | ??29 | ??40 | ??19 | ??20 | ??28 | ??20 | ??14 | ??8 |
| ???????kg/10m 2 | ?6.8 | ?4.9 | ?8.3 | ??11.2 | ??14.2 | ??19.5 | ??9.3 | ??9.8 | ??13.7 | ??9.8 | ??6.8 | ??3.9 |
| Gel strength f | ||||||||||||
| 10sec，1b/100ft 2 | ?8 | ?10 | ?11 | ??15 | ??14 | ??25 | ??10 | ??18 | ??14 | ??17 | ??14 | ??6 |
| ???????kg/10m 2 | ?3.9 | ?4.9 | ?5.4 | ??7.3 | ??6.8 | ??12.2 | ??4.9 | ??8.8 | ??6.8 | ??8.3 | ??6.8 | ??2.9 |
| 10min，1b/100ft 2 | ?10 | ?33 | ?13 | ??50 | ??16 | ??64 | ??12 | ??48 | ??15 | ??48 | ??19 | ??29 |
| ???????kg/10m 2 | ?4.9 | ?16.1 | ?6.3 | ??24.4 | ??7.8 | ??31.2 | ??5.9 | ??23.4 | ??7.3 | ??23.4 | ??9.3 | ??14.2 |
| The loss of HTHP liquid g，ml | ?2.0 | ?2.4 | ?2.6 | ??2.6 | ??2.4 | ??3.4 | ??1.6 | ??3.0 | ??2.0 | ??4.4 | ??2.4 | ??3.0 |
| ES h, volt | ?626 | ?726 | ?511 | ??237 | ??683 | ??970 | ??642 | ??903 | ??582 | ??237 | ??401 | ??590 |
| The separating of oil amount in upper strata i，ml | ?33 | ??22 | ??15 | ??28 | ??16 | ??20 | ||||||
The data of listing among the table B show the interesting trend that is demonstrated by oil base drilling fluid of the present invention.Particularly, as previously mentioned, the ability of 3rpm and yield point rheology value representation drilling fluid suspension drilling cuttings and weighting agent.As show shown in the B, for the oil base drilling fluid in the scope of the invention, the 3rpm of aged, heat treated drilling fluid and mobile point value tend to similar to the value of liquid before they corresponding aging or are higher than its value.In fact, under the used test condition, the ratio of the 3rpm reading of aged oil base drilling fluid and the 3rpm reading of not aged oil base drilling fluid is tending towards at least about 0.7: 1 in example 1-6.Preferred this ratio is about 0.7: about 1.5: 1 of 1-, more preferably about 0.8: about 1.5: 1 of 1-further is preferably about 0.85: about 1.4: 1 of 1-most preferably is about 0.9: about 1.4: 1 of 1-.Comparative Examples 7
In Comparative Examples 7, the density of the 2.16kg/l that has an appointment (about 18ppg) and the oil base drilling fluid (3 experiment bucket, every barrel contains about 350ml) that exceeds the scope of the invention add described one-tenth in succession and assign to prepare by connecing the order that proposes among the table C.After adding each composition, at the composition that mixes gained before composition adds the composition of back, mixing wherein continues pointed mixing time.
Table C
| Composition | Example 7 | Mixing time (minute) |
| Diesel oil, ml | ????164.5 | |
| The main emulsifying agent of the Invermul NT trade mark, ml | ????8.5 | |
| Lime, g | ????6.0 | |
| The fluid loss control agent of the Duratone HT trade mark, g | ????10.0 | ????20 |
| Salt brine solution CaCl 2，g | ????12.1 | ????10 |
| Water, ml | ????23.8 | |
| The organophilic clay of Bentone 38 trades mark, g | ????2.0 | ????20 |
| The oil-wetting agent of the EZ Mul NT trade mark, ml | ????4.2 | ????10 |
| Barium sulfate, g | ????572 | ????20 |
The initial rheology matter of a sample of the drilling fluid that detection is joined by above-mentioned table C system.Test two less important aged samples, promptly two wellbore fluid samples wore out about 72 hours.In the presence of about 790.8kpa (100psi) nitrogen, the sample of burn-in test put into and agingly play the form height pressure vessel, and this container is rotated at about 190.6 ℃ (375 °F).After aging, measure the denseness of separating of oil amount in upper strata and record drilling fluid.Then with the sample remix of burn-in test and detect their rheological property.Unless among the table D explanation is arranged in addition, measures the rheological property of initial and burn-in test according to the step described in the API at about 48.9 ℃ (120 °F).Measuring result is shown among the table D.
Table D
| Comparative Examples 7 | ||
| Character | ????I a | ????A b |
| Meter reading c， | ||
| 600rpm， | ????118.5 | ????99 |
| 300rpm， | ????66 | ????47 |
| 200rpm， | ????48.5 | ????32.5 |
| 100rpm， | ????31 | ????18.5 |
| 6rpm， | ????8 | ????3 |
| 3rpm， | ????7 | ????2 |
| PV d，cp | ????52.5 | ????52 |
| ?????N-sec/m 2(10 3) | ????52.5 | ????52 |
| VP e，1b/100ft 2 | ????13.5 | ????-5 |
| ????????kg/10m 2 | ????6.6 | ????-2.4 |
| Gel strength f | ||
| 10sec，1b/100ft 2 | ????8.5 | ????4 |
| ???????kg/10m 2 | ????4.1 | ????2.0 |
| 10min，1b/100ft 2 | ????11 | ????9.5 |
| ???????kg/10m 2 | ????5.4 | ????4.6 |
| The loss of HTHP liquid g，ml | ????3.0 | ????3.8 |
| ES h, volt | ????405 | ????439 |
| The separating of oil amount in upper strata i，ml | ????17.5 | |
A-i is identical with top table B footmark note.
The trend that demonstrates with drilling fluid in the scope of the invention is opposite, and the aged of prior art, the 3rpm of heat treated oil base drilling fluid and mobile point value are significantly less than the value before drilling fluid aging of same prior art shown in table D.Thereby, the liquid of the prior art that example 7 is surveyed does not have the advantage of oil base drilling fluid of the present invention, and oil base drilling fluid of the present invention produces 3rpm aged, heat treated drilling fluid 3rpm and the mobile point value similar or higher with mobile point value to the preceding drilling fluid that wears out.
Though the present invention describes in detail with reference to some preferred version, other scheme also is possible.Thereby the essence of claim and scope are not necessarily limited to preferred version described here.
Claims
Modification according to the 19th of treaty
1. oil base drilling fluid, contain:
(a) a kind of non-sulfonated thermoplastic polymer that is selected from following material: polystyrene; Poly-(o-methyl styrene); Poly-(vinyl toluene); Poly-(p-methylstyrene); Poly-(2, the 4-dimethyl styrene); Poly-(2, the 5-dimethyl styrene); Poly-(to t-butyl styrene); Poly-(to chloro-styrene); Poly-(alpha-methyl styrene); Polystyrene, poly-(o-methyl styrene), poly-(vinyl toluene), poly-(p-methylstyrene), poly-(2, the 4-dimethyl styrene), the multipolymer and the terpolymer of poly-(2, the 5-dimethyl styrene), poly-(to t-butyl styrene), poly-(to chloro-styrene) and poly-(alpha-methyl styrene);
(b) a kind of oil;
(c) a kind of weighting agent;
(d) a kind of tensio-active agent; With
(e) a kind of non-organophilic clay.
2. the oil base drilling fluid of claim 1, wherein non-organophilic clay is selected from polynite, wilkinite, hectorite, talcum powder, attapulgite, illite or its mixture.
3. the oil base drilling fluid of claim 1, wherein non-organophilic clay is selected from wilkinite, hectorite or its mixture.
4. the oil base drilling fluid of one of claim 1-3, wherein non-sulfonated thermoplastic polymer is a polystyrene.
5. the oil base drilling fluid of one of claim 1-4, wherein in the presence of about 790.8kPa (100Psi) nitrogen, be at least about 0.70 at the 3rpm reading of the oil base drilling fluid of about 190.6 ℃ (375) of about 190.6 ℃ (375) thermal ageings after about 72 hours and ratio at the 3rpm reading of the oil base drilling fluid of the temperature of about 48.9 ℃ (120), the 3rpm reading is to utilize " working specification-standard step that is used for the recommendation of field assay drilling fluid ", the working specification 13B-2 (RP13B-2) that recommends, the 2nd edition, on December 1st, 1991, american petroleum research institute, Washington, the district of Columbia, described in 115 volts of motor-driven viscometers record.
6. the oil base drilling fluid of one of claim 1-5 further contains a kind of organophilic clay.
7. the oil base drilling fluid of claim 6, wherein the ratio of the weight of the weight of non-organophilic clay and organophilic clay is about 4: about 1: 4 of 1-.
8. the oil base drilling fluid of one of claim 1-7 has less than about 0.143g/m
2The total concn of sulfonated polymers (0.05ppb).
9. the oil base drilling fluid of one of claim 1-8, wherein the total concn of the non-sulfonated thermoplastic polymer of all in the oil base drilling fluid is greater than the total concn of the polymkeric substance of the non-thermal plasticity of oil base drilling fluid.
10. the oil base drilling fluid of one of claim 1-9, the ratio of the weight of wherein non-sulfonated thermoplastic polymer and the weight of non-organophilic clay is about 1: about 4: 1 of 4-.
11. the oil base drilling fluid of one of claim 1-10 contains the about 42.9kg/m of the 0.143-that has an appointment
3The non-sulfonated thermoplastic polymer of (0.05-15 pound/bucket).
12. the oil base drilling fluid of one of claim 1-11 contains the about 42.9kg/m of the 0.143-that has an appointment
3The non-organophilic clay of (0.05-15 pound/bucket).
13. a well system comprises:
(a) a kind of stratum;
(b) well that penetrates the stratum;
(c) drill bit that is suspended in the well; With
(d) near a kind of drilling fluid that is placed in the well and drill bit, wherein drilling fluid is the oil base drilling fluid of one of claim 1-12.
14. the method for a drilling well in the stratum, this method comprises the steps:
(a) the borehole bottom rotary drill bit and
(b) a kind of drilling fluid is added well and collect drilling cuttings and (ii) take at least a portion drilling cuttings out of well with (i), wherein drilling fluid is the oil base drilling fluid of one of claim 1-12.
Claims (26)
1. an oil base drilling fluid that contains oil, weighting agent and tensio-active agent is characterized in that oil base drilling fluid further contains a kind of non-organophilic clay.
2. the oil base drilling fluid of claim 1, wherein non-organophilic clay is selected from polynite, wilkinite, hectorite, talcum powder, attapulgite and illite or its mixture.
3. the oil base drilling fluid of claim 1, wherein non-organophilic clay is selected from wilkinite, hectorite or its mixture.
4. the oil base drilling fluid of claim 1 further contains a kind of non-sulfonated polymers.
5. the oil base drilling fluid of claim 1 further contains a kind of non-sulfonated thermoplastic polymer.
6. the oil base drilling fluid of claim 1 further contains a kind of non-sulfonated thermoplastic polymer that is selected from following material: rubber; Polyvinyl chloride; Nylon; Fluorocarbon; Linear polyethylene; Polyurethane prepolymer; Polystyrene; Poly-(o-methyl styrene); Poly-(vinyl toluene); Poly-(p-methylstyrene); Poly-(2, the 4-dimethyl styrene); Poly-(2, the 5-dimethyl styrene); Poly-(to t-butyl styrene); Poly-(to chloro-styrene); Poly-(alpha-methyl styrene); Polystyrene, poly-(o-methyl styrene), poly-(vinyl toluene), poly-(p-methylstyrene), poly-(2, the 4-dimethyl styrene), poly-(2, the 5-dimethyl styrene), poly-(to t-butyl styrene), poly-(to chloro-styrene) and gather (alpha-methyl styrene) each other or with the multipolymer or the terpolymer of vinyl cyanide, Vinyl toluene or methyl methacrylate; Polypropylene; Acrylic resin; The cellulosic resin; With polyvinyl toluene.
7. the oil base drilling fluid of claim 1 further contains a kind of non-sulfonated thermoplastic polystyrene polymkeric substance.
8. the oil base drilling fluid of claim 1, wherein non-organophilic clay is selected from polynite, wilkinite, hectorite, talcum powder, attapulgite, illite or its mixture, and drilling fluid further contains a kind of non-sulfonated polymers.
9. the oil base drilling fluid of claim 1, wherein non-organophilic clay is selected from polynite, wilkinite, hectorite, talcum powder, attapulgite, illite or its mixture, and drilling fluid further contains a kind of non-sulfonated thermoplastic polymer.
10. the oil base drilling fluid of claim 1, wherein non-organophilic clay is selected from polynite, wilkinite, hectorite, talcum powder, attapulgite, illite or its mixture, and this drilling fluid further contains a kind of non-sulfonated thermoplastic polymer that is selected from following material: rubber; Polyvinyl chloride; Nylon; Fluorocarbon; Linear polyethylene; Polyurethane prepolymer; Polystyrene; Poly-(o-methyl styrene); Poly-(vinyl toluene); Poly-(p-methylstyrene); Poly-(2, the 4-dimethyl styrene); Poly-(2, the 5-dimethyl styrene); Poly-(to t-butyl styrene); Poly-(to chloro-styrene); Poly-(alpha-methyl styrene); Polystyrene, poly-(o-methyl styrene), poly-(vinyl toluene), poly-(p-methylstyrene), poly-(2, the 4-dimethyl styrene), poly-(2, the 5-dimethyl styrene), poly-(to t-butyl styrene), poly-(to chloro-styrene) and gather (alpha-methyl styrene) each other or with the multipolymer or the terpolymer of vinyl cyanide, Vinyl toluene or methyl methacrylate; Polypropylene; Acrylic resin; The cellulosic resin; With polyvinyl toluene.
11. the oil base drilling fluid of claim 1, wherein non-organophilic clay is selected from polynite, wilkinite, hectorite, talcum powder, attapulgite, illite or its mixture, and drilling fluid further contains a kind of non-sulfonated thermoplastic polystyrene polymkeric substance.
12. the oil base drilling fluid of claim 1, wherein non-organophilic clay is selected from wilkinite, hectorite or its mixture, and drilling fluid further contains a kind of non-sulfonated thermoplastic polystyrene polymkeric substance.
13. the oil base drilling fluid of claim 1, wherein be at least about 0.70 at the 3rpm reading of the oil base drilling fluid of about 190.6 ℃ (375) of about 190.6 ℃ (375) thermal ageings after about 72 hours and ratio in the presence of the nitrogen of about 790.8kPa (100Psi) at the 3rpm reading of the oil base drilling fluid of the temperature of about 48.9 ℃ (120), utilization is in " working specification-standard step that is used for the recommendation of field assay drilling fluid ", the working specification 13B-2 (RP13B-2) that recommends, second edition, on December 1st, 1991, american petroleum research institute, Washington, the district of Columbia, described in 115 volts of motor-driven viscometers obtain described 3rpm reading.
14. the oil base drill-in fluid of claim 1 further contains a kind of organophilic clay.
15. a well system comprises:
(a) stratum;
(b) well that penetrates described stratum;
(c) drill bit that is suspended in the well; With
(d) near a kind of drilling fluid that is put in the well and drill bit, wherein drilling fluid is the oil base drilling fluid of claim 1.
16. the method for a drilling well in the stratum, this method comprises the steps:
(a) the bottom of well rotary drill bit and
(b) drilling fluid is introduced well and collected drilling cuttings and (ii) take at least a portion drilling cuttings out of well with (i), wherein drilling fluid is the oil base drilling fluid of claim 1.
17. an oil base drilling fluid that contains oil, weighting agent and tensio-active agent is characterized in that oil base drilling fluid further contains a kind of non-sulfonated polymers, and has less than about 0.143g/m
2Sulfonated polymers total concn (0.05ppb).
18. the oil base drilling fluid of claim 17, wherein non-sulfonated polymers is a kind of thermoplastic polymer.
19. the oil base drilling fluid of claim 17, wherein non-sulfonated polymers is a kind of non-sulfonated thermoplastic polymer, and the total concn of all the non-sulfonated thermoplastic polymers in oil base drilling fluid is greater than the total concn of all the non-thermal plasticity polymkeric substance in the oil base drilling fluid.
20. the oil base drilling fluid of claim 17 further contains a kind of non-organophilic clay.
21. the oil base drilling fluid of claim 17, further contain a kind of non-organophilic clay, wherein non-sulfonated polymers is a kind of non-sulfonated thermoplastic polymer, and the weight ratio of the weight of non-sulfonated thermoplastic polymer and non-organophilic clay is about 1: 4 to about 4: 1.
22. the oil base drilling fluid of claim 17, wherein oil base drilling fluid further contains a kind of non-organophilic clay and a kind of organophilic clay, and the ratio of the weight of non-organophilic clay and organophilic weight is about 4: about 1: 4 of 1-.
23. the oil base drilling fluid of claim 17, wherein non-sulfonated polymers are a kind of non-sulfonated thermoplastic polymers, and oil base drilling fluid contains the about 42.9kg/m of the 0.143-that has an appointment
3The non-sulfonated thermoplastic polymer of (0.05-15 pound/bucket).
24. the oil base drilling fluid of claim 17 further contains the about 42.9kg/m of the 0.143-that has an appointment
3The non-organophilic clay of (0.05-15 pound/bucket).
25. a well system comprises:
(a) stratum;
(b) well that penetrates described stratum;
(c) drill bit that is suspended in the well; With
(d) a kind ofly put near drilling fluid well and drill bit, wherein drilling fluid is the oil base drilling fluid of claim 17.
26. the method for a drilling well in the stratum, this method comprises the steps:
(a) the borehole bottom rotary drill bit and
(b) drilling fluid is added in the well with (i) and collect drilling cuttings and (ii) take at least a portion drilling cuttings out of well, wherein drilling fluid is the oil base drilling fluid of claim 17.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95194261 CN1156473A (en) | 1994-06-30 | 1995-06-22 | Thermally stable oil-base drilling fluid |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/268,801 | 1994-06-30 | ||
| CN 95194261 CN1156473A (en) | 1994-06-30 | 1995-06-22 | Thermally stable oil-base drilling fluid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1156473A true CN1156473A (en) | 1997-08-06 |
Family
ID=5082641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95194261 Pending CN1156473A (en) | 1994-06-30 | 1995-06-22 | Thermally stable oil-base drilling fluid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1156473A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102191022A (en) * | 2010-03-19 | 2011-09-21 | 长江大学 | Low-emulsifier-content oil-base drilling fluid |
-
1995
- 1995-06-22 CN CN 95194261 patent/CN1156473A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102191022A (en) * | 2010-03-19 | 2011-09-21 | 长江大学 | Low-emulsifier-content oil-base drilling fluid |
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