CN105419758A - Well cementation flushing liquid system suitable for oil-based drilling fluid and preparation method thereof - Google Patents
Well cementation flushing liquid system suitable for oil-based drilling fluid and preparation method thereof Download PDFInfo
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Abstract
A well cementation flushing liquid system suitable for an oil-based drilling fluid and a preparation method thereof. The invention mainly solves the defects of low flushing efficiency, poor wetting conversion capability and poor interface cementing quality in the flushing liquids in the prior art. The flushing liquid system comprises the following components, by weight: 100 parts of clear water, 0.8-1.2 parts of an anionic surfactant, 0.6-0.8 parts of a nonionic surfactant, 0.7-1.0 part of a cosurfactant, 6.0-10.0 parts of an oil phase, 8.0-12.0 parts of a salt water phase, 0.15-5.0 parts of a polymer, 0.0-150 parts of a weighting agent and 1.0-2.5 parts of salt. The flushing liquid system is adjustable in density within 1.01-1.90 g/cm<3> and is 20-130 DEG C in available temperature range. The flushing liquid system can quickly remove residual oil-based drilling fluid, is strong in wetting conversion capability, ensures cementation between cement rings and an annular space, and is wide in application prospect.
Description
Technical field
The present invention relates to oil gas well cementing operation field, particularly relate to a kind of the well cementation washing fluid system and the preparation method that are applicable to oil base drilling fluid, before being specially adapted to well cementation, oil base drilling fluid is rinsed, improve well cementation interface agglutination quality.
Background technology
Oil base drilling fluid contamination resistance is strong, stable performance, strong inhibition capability, oilness are good; be conducive to keeping wellbore stability; can reservoir protec-tion to greatest extent, apply in the bad ground such as mud shale, saline bed and the construction of the Special Drilling Operation such as deep-well, extended reach well and increase year by year.But in oil gas well cementing operation, oil base drilling fluid can have a negative impact to cementing quality: oil base drilling fluid viscosity is high, adhesive ability strong, sleeve pipe and the borehole wall is caused to rinse difficulty; Oil base drilling fluid forms fine and close filter cake on the borehole wall, is difficult to be rinsed liquid and effectively rinses, and causes forming micro-annulus in bore hole annulus interface; Oil base drilling fluid can make the borehole wall and casing wall become lipophilicity, affects grout and the borehole wall and ferrule interface bonding quality.Due to above reason, reduce first, second interface cementing strength of well cementation, have a strong impact on cementing quality, even likely cause oil gas water channeling.For many years, how effectively to remove the wettability of oil residues base drilling fluid and filter cake, guarantee sleeve pipe and the borehole wall, always be the difficult problem in casing and cementing.
Large quantifier elimination has been carried out both at home and abroad with regard to the washing fluid being applicable to oil base drilling fluid.Oil base drilling fluid well cementation washing fluid disclosed in CN1174075C, primarily of macrogol ester, water-wetter alkylphenol polyoxyethylene and base oil phase composite, this washing fluid can effectively rinse oil residues base drilling fluid and filter cake, has dilution viscosity reduction effect preferably to oil base drilling fluid simultaneously.Oil base drilling fluid washing fluid and preparation method thereof disclosed in CN1405265A, be mainly used in solving the low problem of second interface consolidation strength, its Main Function composition is sequestrant disodium ethylene diamine tetraacetate, Surfactant SDS and alkyl fatty polyoxyethylenated alcohol.A kind of oil base drilling fluid washing fluid being applicable to high temperature and high salt environment disclosed in CN103555306A, Main Function composition is ionogenic surfactant AES and nonionogenic tenside ethoxylated dodecyl alcohol, this system has higher salt concn, and can higher temperature resistant.Yue Qiansheng etc. develop a kind of oil base drilling fluid filter cake removal liquid HCF, and it is a kind of metastable oil-in-water emulsion systems, and wherein aqueous phase is made up of mixing acid, cleaning permeate agent, clay stabilizer, inhibiter, emulsifying agent and scale inhibitor etc.King's Chong etc. have developed a kind of washing fluid BCS-020L being applicable to oil base drilling fluid, has good rinse capability and wettability reversal ability.United States Patent (USP) 6,686, a kind of washing fluid disclosed in 323, its mechanism of action utilizes the mixing solutions of alkyl poly glucoside class tensio-active agent and esters solvent to rinse.The Jonathan etc. of the people such as the Ryan of Halliburton Company, Baker Hughes Inc proposes microemulsion technology to be applied in well cementation washing fluid per capita, for cleaning oil base drilling fluid residual in well, and tentatively achieves certain achievement.
Generally believe effective flushing of the oil base drilling fluid to Interface Adhesion, filter cake at present and be the key factor improving interface bonding quality under oil base drilling fluid condition to the efficient wettability reversal in interface.The well cementation washing fluid system being directed to oil base drilling fluid of current institute research and development, main based on polymkeric substance, surfactant soln, there is wettability reversal ability weak, efficiently drilling fluid on the borehole wall and filter cake cannot to be cleaned up etc. not enough, be difficult to satisfied well cementation demand.Therefore, study the efficient well cementation washing fluid being applicable to oil base drilling fluid and there is significant market efficiency.
Summary of the invention
The object of the invention is to overcome that existing well cementation washing fluid is low to oil base drilling fluid flush efficiency, the ropy shortcoming and defect of interface agglutination, providing a kind of the well cementation washing fluid system and the preparation method that are applicable to oil base drilling fluid.This washing fluid system is by microemulsion is diluted to nanoemulsions, and adds polymkeric substance, weighting agent, dispersion agent and stablizer etc., and preparing density is 1.01g/cm
3~ 1.90g/cm
3, Applicable temperature scope can reach the washing fluid of 20 DEG C ~ 130 DEG C.The performance such as the nanoemulsions in this well cementation washing fluid has infiltration, dissolving, solubilising, carry, residual oil base drilling fluid can be removed fast and efficiently, with oil base drilling fluid, there is good consistency, to annular space interface, there is good wetting modifying function, be conducive to promoting the cementing of cement mantle and annular space interface, have site operation simply with the advantage significantly improving cementing quality.
For achieving the above object, well cementation washing fluid system of the present invention, according to mass fraction, it consists of:
100 parts, clear water;
Anion surfactant 0.8 ~ 1.2 part;
Nonionogenic tenside 0.6 ~ 0.8 part;
Cosurfactant 0.7 ~ 1.0 part;
Oil phase 6.0 ~ 10.0 parts;
Salt aqueous phase 8.0 ~ 12.0 parts;
0.15 ~ 5.0 part, polymkeric substance;
Weighting agent 0.0 ~ 150 part;
Salt 1.0 ~ 2.5 parts.
Described anion surfactant can be the one in Sodium dodecylbenzene sulfonate, sodium laurylsulfonate, sodium lauryl sulphate.
Described nonionogenic tenside can be the one in fatty alcohol-polyoxyethylene ether AEO-3, AEO-5, AEO-9 or polyol ester Tween40, Tween60, Tween80.
Described cosurfactant can be the one in n-propyl alcohol, propyl carbinol, Pentyl alcohol, propandiol butyl ether, propylene glycol monomethyl ether, butyl glycol ether.
Described oil phase can be the one in normal hexane, normal heptane, octane, hexanaphthene.
Described salt aqueous phase can be one of sodium chloride aqueous solution, potassium chloride solution, and mass percent concentration is 1.5 ~ 3.0%.
Described polymkeric substance can be 2-acrylamide-2-methyl propane sulfonic (AMPS) and N,N-DMAA (DMAA) polymkeric substance, 2-acrylamide-2-methyl propane sulfonic (AMPS) and the one or more combination in acrylamide (AM) polymkeric substance, carboxymethyl hydroxyethyl cellulose (CMHEC), polyvinyl alcohol (PVA), xanthan gum.
Described weighting agent can be the one or more combination in barite powder, quartz sand, powdered iron ore, and described barite particle diameter is between 25 ~ 48 μm, and described quartz sand particle size is between 58 ~ 106 μm, and described powdered iron ore particle diameter is between 10 ~ 37 μm.
Described salt can be the one in Repone K, sodium-chlor.
The described preparation method being applicable to the washing fluid system of oil base drilling fluid, step is as follows:
8.0 ~ 12 parts of salt aqueous phases are added in slurry cup, add 0.6 ~ 0.8 portion of nonionogenic tenside and 0.8 ~ 1.2 portion of anion surfactant again, stir with certain rotating speed, add 6 ~ 10 parts of oil phases, then 0.7 ~ 1.0 portion of cosurfactant is added, leave standstill 1 ~ 3h, the microemulsion that the spontaneous formation of system is stable; 100 parts of clear water are added in another slurry cup, and add 1.0 ~ 2.5 portions of salt, after it thoroughly dissolves, drop into 0.15 ~ 5.0 part of polymkeric substance, first with 800 ~ 1200r/min high-speed stirring, 10 ~ 30min again with 150 ~ 300r/min stirring at low speed 1h, then add 0.0 ~ 150 part of weighting agent, stir; Above-mentioned two kinds of solution are mixed and stirs 1 ~ 3min with 800 ~ 3000r/min, the well cementation washing fluid system being applicable to oil base drilling fluid can be obtained.
Advantage of the present invention: the short chain alcohol in (1) the present invention can be dissolved in oil phase and aqueous phase simultaneously, has to a certain degree modifying function to oil phase and aqueous phase, can effectively reduce interfacial tension between profit, and being conducive to increases the rinse capability to oil; (2) there is a large amount of micella in washing fluid punching, can a large amount of oil of solubilising also " dissolving " in water, improve rinse capability and take oily ability; (3) tensio-active agent in washing fluid can be sprawled at the borehole wall of oil wettability and ferrule interface and come, make it to become hygroscopicity, make that oil base drilling fluid is more difficult to be sticked to its surface thus be more easily rinsed, provide suitable for grout is cementing, clean environment simultaneously; (4) the nano-liquid droplet structure in washing fluid increases interfacial area, adds the contact efficiency of washing fluid and oil base drilling fluid, can wash oil base drilling fluid effectively; (5) nanoemulsions particle diameter is very little, may penetrate in filter cake, accelerates the failure, dissolving filter cake, improves the developing result to filter cake.
The invention provides the washing fluid system that a kind of principle is reliable, preparation is simple, cost is low, can meet on-the-spot cementing requirements, this washing fluid system overcomes that the existing well cementation flush efficiency for oil base drilling fluid is low, the shortcoming of wettability reversal ability, and density is at 1.01g/cm
3~ 1.90g/cm
3between adjustable, well cementation rinse range of working temperature can reach 20 DEG C ~ 130 DEG C.
Embodiment
Embodiment 1: a kind of composition being applicable to the well cementation washing fluid system of oil base drilling fluid
A kind of well cementation washing fluid system being applicable to oil base drilling fluid can be made up of following material, the mass fraction of each material is specially: 100 parts, clear water, anionic surfactant sodium dodecylbenzene sulfonate 1 part, nonionogenic tenside fatty alcohol-polyoxyethylene ether AEO-90.7 part, cosurfactant propyl carbinol 0.7 part, oil phase normal heptane 7 parts, salt aqueous phase potassium chloride solution 9 parts, polymer carboxymethyl Natvosol 3 parts, weighting agent quartz sand 32 parts, 2 parts, Repone K, washing fluid density is 1.2g/cm
3.
Embodiment 2: a kind of composition being applicable to the well cementation washing fluid system of oil base drilling fluid
A kind of well cementation washing fluid system being applicable to oil base drilling fluid can be made up of following material, the mass fraction of each material is specially: 100 parts, clear water, anion surfactant sodium laurylsulfonate 0.8 part, nonionogenic tenside polyol ester Tween800.6 part, cosurfactant propandiol butyl ether 0.8 part, oil phase hexanaphthene 6 parts, salt aqueous phase sodium chloride aqueous solution 8 parts, polymer polyethylene alcohol 5 parts, 94 parts, weighting agent barite, 2 parts, sodium-chlor, washing fluid density is 1.7g/cm
3.
Embodiment 3: the consistent flow sex change of washing fluid system is evaluated
Be tested object with embodiment 1 rinsing liq, first washing fluid is prepared, then consistent flow sex change is evaluated by People's Republic of China (PRC) oil and gas industry standard SY/T5374-2000 " Oil/gas Well cementing spearhead using method ", drilling fluid/washing fluid 95/5,75/25,50/50,25/75,5/95 to mix in proportion, use six fast viscometer determining rheologicals, and contrast with the drilling fluid not being mixed with washing fluid, probe temperature 70 DEG C.The oil base drilling fluid formula adopted consists of: white oil+1.5%VG-69 organophilic clay+0.5%LCR-01D primary emulsion+3% fluid loss agent+25% water+5% calcium chloride+0.5% co-emulsifier, drilling fluid density is 1.30g/cm
3.Test-results is in table 1.
Table 1 is cemented the well the consistent flow sex change of washing fluid system
Wherein,
pV=Ф 600-Ф 300; N=3.32lg (Ф 600/ Ф 300); K=(0.511 Ф 600)/1022
n.
Embodiment 4: the flushing rate of washing fluid system is evaluated
Be tested object with embodiment 1 rinsing liq, first washing fluid is prepared, then evaluate flush efficiency by People's Republic of China (PRC) oil and gas industry standard SY/T5374-2000 " Oil/gas Well cementing spearhead using method ", rotating speed is 1400 revs/min, and flush time is 5 minutes.The oil base drilling fluid formula adopted consists of: white oil+1.5%VG-69 organophilic clay+0.5%LCR-01D primary emulsion+3% fluid loss agent+25% water+5% calcium chloride+0.5% co-emulsifier, drilling fluid density is 1.30g/cm
3.Test-results is in table 2.
The flushing rate of table 2 washing fluid system
Wherein, flushing rate
Embodiment 5: washing fluid system is to cement plane wettability reversal performance evaluation
Be tested object with embodiment 1 rinsing liq, first prepare washing fluid.As follows to well cementation interface pollution experimental technique: to adopt wellbore hole simulator method, according to standard GB/T/T16783.2-2012 " drilling fluid on-the-spot test part 2: oil base drilling fluid ", under certain temperature, 3.5MPa condition, carry out oil base drilling fluid pollute experiment in 30 minutes, with oil base drilling fluid, sleeve pipe (the first interface of cementing the well) and core (well cementation second contact surface) are polluted.Experimental technique is rinsed to well cementation interface as follows: adopt wellbore hole simulator method, under certain temperature, 3.5MPa condition, use well cementation washing fluid system to rinse sleeve pipe, core, according to People's Republic of China (PRC) oil and gas industry standard SY/T5374-2000 " Oil/gas Well cementing spearhead using method ", washing fluid discharge speed is 0.5m/s, and flush time is 10min.Wetting angle adopts DSA100 optical contact angle measuring instrument to measure.Interface cementing strength measuring method: sleeve pipe and core are put into mould, injects grout, in the water-bath of 70 DEG C after maintenance 24h, measures interface cementing strength with pressing machine.The oil base drilling fluid formula adopted consists of: white oil+1.5%VG-69 organophilic clay+0.5%LCR-01D primary emulsion+3% fluid loss agent+25% water+5% calcium chloride+0.5% co-emulsifier, drilling fluid density is 1.30g/cm
3.Experimental result is in table 3.
Table 3 cements the well washing fluid system to cement plane wettability reversal performance
As can be seen from table 1, table 2 and table 3, washing fluid system of the present invention and drilling fluid have good consistency, within a short period of time oil base drilling fluid can be cleaned up, have higher flush efficiency and temperature resistance, after rinsing first, second interface of well cementation, two interfaces are wetting ability, wettability reversal is functional, provide suitable environment for grout is cementing, ensure interface cementing strength, contribute to very much improving well cementation interface agglutination quality and cementing quality.
Certainly; the above is only one embodiment of the present invention; should be understood that those skilled in the art; under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications all belong within the protection domain of the claims in the present invention.
Claims (10)
1. be applicable to a well cementation washing fluid system for oil base drilling fluid, it is characterized in that each component and part by weight as follows:
2. the well cementation washing fluid system being applicable to oil base drilling fluid according to claim 1, it is characterized in that preparation method is: in slurry cup, add 8.0 ~ 12 parts of salt aqueous phases, add 0.6 ~ 0.8 portion of nonionogenic tenside and 0.8 ~ 1.2 portion of anion surfactant again, stir with certain rotating speed, add 6 ~ 10 parts of oil phases, then add 0.7 ~ 1.0 portion of cosurfactant, leave standstill 1 ~ 3h, the microemulsion that the spontaneous formation of system is stable; 100 parts of clear water are added in another slurry cup, and add 1.0 ~ 2.5 portions of salt, after it thoroughly dissolves, drop into 0.15 ~ 5.0 part of polymkeric substance, first with 800 ~ 1200r/min high-speed stirring, 10 ~ 30min again with 150 ~ 300r/min stirring at low speed 1h, then add 0.0 ~ 150 part of weighting agent, stir; Above-mentioned two kinds of solution are mixed and stirs 1 ~ 3min with 800 ~ 3000r/min, the well cementation washing fluid system being applicable to oil base drilling fluid can be obtained.
3. the well cementation washing fluid system being applicable to oil base drilling fluid according to claim 1, is characterized in that described anion surfactant can be the one in Sodium dodecylbenzene sulfonate, sodium laurylsulfonate, sodium lauryl sulphate.
4. the well cementation washing fluid system being applicable to oil base drilling fluid according to claim 1, is characterized in that described nonionogenic tenside can be the one in fatty alcohol-polyoxyethylene ether AEO-3, AEO-5, AEO-9 or polyol ester Tween40, Tween60, Tween80.
5. the well cementation washing fluid system being applicable to oil base drilling fluid according to claim 1, is characterized in that described cosurfactant can be the one in n-propyl alcohol, propyl carbinol, Pentyl alcohol, propandiol butyl ether, propylene glycol monomethyl ether, butyl glycol ether.
6. the well cementation washing fluid system being applicable to oil base drilling fluid according to claim 1, is characterized in that described oil phase can be the one in normal hexane, normal heptane, octane, hexanaphthene.
7. the well cementation washing fluid system being applicable to oil base drilling fluid according to claim 1, it is characterized in that described salt aqueous phase can be one of sodium chloride aqueous solution, potassium chloride solution, mass percent concentration is 1.5 ~ 3.0%.
8. the well cementation washing fluid system being applicable to oil base drilling fluid according to claim 1, it is characterized in that described polymkeric substance can be 2-acrylamide-2-methyl propane sulfonic (AMPS) and N,N-DMAA (DMAA) polymkeric substance, 2-acrylamide-2-methyl propane sulfonic (AMPS) and the one or more combination in acrylamide (AM) polymkeric substance, carboxymethyl hydroxyethyl cellulose (CMHEC), polyvinyl alcohol (PVA), xanthan gum.
9. the well cementation washing fluid system being applicable to oil base drilling fluid according to claim 1, it is characterized in that described weighting agent can be the one or more combination in barite powder, quartz sand, powdered iron ore, described barite particle diameter is between 25 ~ 48 μm, described quartz sand particle size is between 58 ~ 106 μm, and described powdered iron ore particle diameter is between 10 ~ 37 μm.
10. the well cementation washing fluid system being applicable to oil base drilling fluid according to claim 1, is characterized in that described salt can be the one in Repone K, sodium-chlor.
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Application publication date: 20160323 |