CN104927805A - High-density water-based drilling fluid applicable to continental deposit sensitive shale formation - Google Patents
High-density water-based drilling fluid applicable to continental deposit sensitive shale formation Download PDFInfo
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- CN104927805A CN104927805A CN201510354521.1A CN201510354521A CN104927805A CN 104927805 A CN104927805 A CN 104927805A CN 201510354521 A CN201510354521 A CN 201510354521A CN 104927805 A CN104927805 A CN 104927805A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/22—Synthetic organic compounds
- C09K8/24—Polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/5086—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/34—Lubricant additives
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Abstract
The invention relates to high-density water-based drilling fluid applicable to continental deposit sensitive shale formation. Based on the fact the mass of added water is 100%, the high-density water-based drilling fluid comprises, by mass percentage, 2-7% of bentonite, 0.1-0.3% of sodium carbonate, 2-8% of fluid loss agent, 2-5% of high-temperature and high-pressure fluid loss agent, 3-5% of polyglycol, 3-6% of blocking anti-collapse agent, 1-3% of aluminum-bases polymer, 0-2% of shale inhibitor, 4-35% of sodium chloride, 0.1-0.5% of sodium hydroxide, 2-5% of lubricant and 50-200% of the weighting material. The high-density water-based drilling fluid has the advantages that chemical blocking materials are used to increase formation semipermeable membrane efficiency, drilling fluid water activity is controlled by adjusting the use amount of the sodium chloride, drilling fluid's permeation to the formation is reduced, the well wall stability problem of the continental deposit sensitive shale formation is solved effectively, and the drilling fluid is high in density, good in rheological property and lubricating performance, and capable of satisfying the high-pressure formation shale gas exploitation horizontal well drilling requirements.
Description
Technical field
The present invention relates to oil drilling technical field, particularly relate to a kind of high-density water-based drilling fluid system being applicable to creeping into nonmarine deposit susceptibility shale formation.
Background technology
Along with the increase day by day of energy consumption, the exploitation of shale gas, shale wet goods unconventional energy resource come into one's own gradually.China's explored shale oil gas pool reserve is huge, and exploratory development is worth high.Current exploitation shale gas mainly adopts long section horizontal well, the method for multistage subsection pressure break, to improve per-well production, promotes commercial mining and is worth.Because shale formation water sensitivity is strong, fracture development, easily occur collapsing, the complexcase such as undergauge in drilling process, the main difficult technical that the drill in fluid therefore exploiting shale gas faces is the Wellbore Stability of long section horizontal well.
Current page rock stratum horizontal well mainly adopts oil base drilling fluid, can solve Wellbore Stability preferably.But shale gas individual well quantum of output is general lower, and the cost of oil-base mud is higher, reduce the industrial value of shale gas exploitation, and oil base drilling fluid exists problems such as feature of environmental protection difference, cost recovery are high, poor stability.It is lower that water-base drilling fluid has cost, relatively more environmental protection, and be easy to find the advantages such as oil and gas reservoir, but common water base drilling fluid system borehole wall stability is poor, lubricate and sticking control scarce capacity, limits the application of water-base drilling fluid in shale oil and gas development.
China's shale gas generally buries darker, such as Sichuan Basin Lower Cambrian Series shale gas-bearing formation buried depth 2000-3500 rice, reservoir pressure is large, and bad grounds such as meeting super high pressure oil gas-bearing formation, brine layer and cream mud stone can be bored, when bore meet the air content comparatively large and shale formation of fracture development time, gas overflowing amount increases severely may cause the accident such as blowout, well kick.Improving drilling fluid density can active balance reservoir pressure, improves borehole wall stability, prevents complexcase from occurring.Therefore, develop a set of high-density water-based drilling fluid being applicable to creep into shale formation, for China's shale oil gas reservoir safe, efficient, low cost development is significant.
Summary of the invention
Main purpose of the present invention is: develop a kind of drilling fluid system being applicable to nonmarine deposit susceptibility shale formation, by high-density equilibrium strata pressure; By using the chemical plugging materials such as aluminium base polymkeric substance, reducing shale rate of permeation, improving semipermeable membrane efficiency; By adding the material such as sodium-chlor, polymeric alcohol, controlling drilling liquid water activity, forming inverse osmosis pressure, reduce the trend that water permeates to stratum, effectively improve shale borehole wall stability.
Specifically, the present invention is achieved through the following technical solutions:
The involved in the present invention high-density water-based drilling fluid system being applicable to nonmarine deposit susceptibility shale formation is 100% by the quality adding water, by percentage to the quality, containing following material:
Wilkinite 2-7%;
Sodium carbonate 0.1-0.3%;
Fluid loss agent 2%-8%;
High Temperature High Pressure fluid loss agent 2-5%;
Polymeric alcohol 3-5%;
Shutoff anti-sloughing agent 3-6%;
Aluminium base polymkeric substance 1-3%;
Shale control agent 0-2%;
Sodium-chlor 4-35%;
Alkaline conditioner 0.1-0.5%;
Lubricant 2-5%;
High-density weighting material 50-150.
Wherein, wilkinite is the moisture clay pit based on montmorillonite, and its chemical general formula is: (Al
2mg
3) (Si
4o
10) (OH)
2nH
2o, has and presss from both sides by two silicon-oxy tetrahedrons the 2:1 type crystal structure that one deck alumina octahedral forms.The present invention can use commercially available conventional sodium bentonite.The sodium bentonite of Shengli Oil Field blogger Mud Technology company limited supply is preferably used in the present invention.
Wherein, described fluid loss agent is one or more in small molecules co-polymer of sulfonate, low adhesive aggregation anionic cellulose, nitrile silicon polymer, hydrolyzed polyacrylonitrile ammonium salt, sulfonated lignite resin.
Wherein, described High Temperature High Pressure fluid loss agent is sulfonated-phenoformoldehyde resin for drilling fluid.
Wherein, described polymeric alcohol is methyl alcohol, tetramethylolmethane etc. containing active hydrogen initiator and one or more in oxyethane, propylene oxide, butylene oxide ring, the liquid ether material that polyaddition reaction obtains under catalyst action.
The anhydrous polymeric alcohol that Shandong get Shun Yuan Petroleum Technology Co., Ltd produces preferably is used in the present invention.
Wherein, described shutoff anti-sloughing agent is one or more in latex bitumen, sulfonated gilsonite, asphalt powder.
The acid-soluble sulfonated gilsonite of height that Shandong get Shun Yuan Petroleum Technology Co., Ltd produces preferably is used in the present invention.
Wherein, described aluminium base polymkeric substance is polymerize aluminum chloride and organic acid complex compound.
The aluminium base polymkeric substance DLP-1 that Shandong get Shun Yuan Petroleum Technology Co., Ltd produces preferably is used in the present invention.
Wherein, described shale control agent is amido polyalcohols, is formed by one or more monomer condenses in organic amine and oxyethane, propylene oxide.
The amido polyalcohols AP-1 that Shandong get Shun Yuan Petroleum Technology Co., Ltd produces preferably is used in the present invention.
Sodium-chlor described in the present invention, comprise edible sodium chloride salt, industrial chlorinations sodium salt etc., what meet standard GB/T/T5462-2003 is all applicable to the present invention.
Sodium hydroxide described in the present invention, comprises the sodium hydroxide of the various purity of use for laboratory, industrial sodium hydroxide etc.
Lubricant described in the present invention be mineral oil modified lubricant, plant oil modified lubricant, emulsified olefin, modified graphite, water base lubricant one or more.
The extreme pressure lubricant HY-202 that Shandong get Shun Yuan Petroleum Technology Co., Ltd produces preferably is used in the present invention.
High-density weighting material described in the present invention, comprise in barite, powdered iron ore, limestone powder, trimanganese tetroxide one or more.
High-density water-based drilling fluid described in the present invention, mainly refers to that density is between 1.5-2.2g/cm
-3between, take water as the drilling fluid of dispersion medium.
A kind of high-density water-based drilling fluid being applicable to nonmarine deposit susceptibility shale formation of the present invention, prepare in accordance with the following steps:
Step one, determines actual amount and the ratio of each treatment agent as the case may be;
Step 2, is added to the water wilkinite and sodium carbonate, prehydration process 24 hours;
Step 3, to in the bentonite slurry after prehydration, proportionally add fluid loss agent, High Temperature High Pressure fluid loss agent, polymeric alcohol, shutoff anti-sloughing agent, aluminium base polymkeric substance, shale control agent, sodium-chlor successively, and observe dissolving or the deployment conditions of often kind for the treatment of agent, after a kind for the treatment of agent fully dissolves or disperses, add lower a kind for the treatment of agent again, until all add;
Step 4, uses the alkaline conditioner of said ratio by between pH regulator to 8-10;
Step 5, adds lubricant and high-density weighting material, stirs 20min, makes drilling fluid density reach drilling well requirement.
Beneficial effect of the present invention is: the present invention uses chemical plugging material to improve stratum semipermeable membrane efficiency, drilling liquid water activity is controlled by adjustment sodium-chlor consumption, reduce drilling fluid to permeate to stratum, effectively solve the Wellbore Stability of nonmarine deposit susceptibility shale formation.There is the feature that high-density, rheological and oilness are good simultaneously, meet high pressure formation shale gas development level well drilling well demand.
Embodiment
Below in conjunction with embodiment and embodiment, the invention will be further described, but illustrated embodiment is not as the restriction to this patent.
Embodiment 1
Take according to the amount of each component of embodiment in table 11, (11000r/min) prepares drilling fluid according to mode of the present invention under high velocity agitation.
Embodiment 2
Take according to the amount of each component of embodiment in table 12, (11000r/min) prepares drilling fluid according to mode of the present invention under high velocity agitation.
Embodiment 3
Take according to the amount of each component of embodiment in table 13, (11000r/min) prepares drilling fluid according to mode of the present invention under high velocity agitation.
Embodiment 4
Take according to the amount of each component of embodiment in table 14, (11000r/min) prepares drilling fluid according to mode of the present invention under high velocity agitation.
The drilling fluid composition composition of table 1 embodiment 1-4
。
The mensuration of embodiment 5 rheological, API filtration, high temperature and high pre ssure filtration
To the drilling fluid system of embodiment 1-4 in strict accordance with the rheological of the method evaluation 120 DEG C of aging front and back in " GB/T 16783.1-2006 industrial gas oil drilling fluid on-the-spot test part 1: water-base drilling fluid " and API filtration, and 150 DEG C, high temperature and high pre ssure filtration under 3.5MPa.The parameter wherein measured has AV(apparent viscosity), PV(plastic viscosity), YP(yield value), ρ (drilling fluid density), FL
aPI(API filtration), FL
hTHP(high temperature and high pre ssure filtration), measurement result is in table 2.
Rheological, filter loss, the Density measurements of table 2 embodiment 1-4 drilling fluid system
As can be seen from above-described embodiment, the rheological of the drilling fluid system described in embodiment 1-4 is good, API filtration and high temperature and high pre ssure filtration low, there is good high-temperature resistance.
Embodiment 6 inhibition is tested
Shengli Oil Field is selected to seek 722 flat 2 well mud stone rock samples, through washing, air-dry, pulverize, cross aperture be that 2.00-3.20 mm sieves, according to the roll experiment evaluation method in " SY/T 6335-1997 shale-control agent for drilling fluid evaluation method ", carry out landwaste recovery experiment, the experiment of rock core swell increment to the drilling fluid system described in embodiment 1-4, experimental data is in table 3.
Table 3 embodiment 1-4 drilling fluid system inhibition experimental result
As can be seen from above-described embodiment, the drilling fluid system described in embodiment 1-4 has higher landwaste and reclaims increase rate, lower rock core swell increment, illustrates that it has stronger inhibition, effectively can control clay dispersion, be conducive to wellbore stability.
Embodiment 7 lubrication experiment
Carry out oilness experiment to the drilling fluid system described in embodiment 1-4, measure sticking coefficient and lubricating coefficient with High Temperature High Pressure adherometer and extreme boundary lubrication instrument respectively, experimental data is in table 4.
Table 4 embodiment 1-4 drilling fluid system oilness experimental result
As can be seen from above-described embodiment, the drilling fluid system described in embodiment 1-4 has good antiseized card ability and extreme boundary lubrication performance, meets the demand of long section shale gas horizontal well.
Embodiment 8 shutoff experiment (sand-bed filtration)
Sand-bed filtration experiment is carried out to the drilling fluid system described in embodiment 1-4, selects 350cm3 to cross the sand of 40-80 mesh sieve,
Test 30min under 0.7MPa, investigate the sealing characteristics of drilling fluid system, experimental data is in table 5.
Table 5 embodiment 1-4 drilling fluid system casting bed seal-off effect experimental result
As can be seen from above-described embodiment, the drilling fluid system described in embodiment 1-4 has good shut-off capacity.
Embodiment 9 high temperature resistance is tested
The drilling fluid system selecting embodiment 4 to prepare carries out high temperature resistance experiment, according to the method evaluation 120 DEG C in " GB/T 16783.1-2006 industrial gas oil drilling fluid on-the-spot test part 1: water-base drilling fluid ", rheological before and after 150 DEG C of aging 16h and API filtration, wherein location parameter has AV(apparent viscosity), PV(plastic viscosity), YP(yield value), FL
aPI(API filtration), measurement result is in table 6.
The high temperature resistance experimental result of table 6 embodiment 4 drilling fluid system
As can be seen from above-described embodiment, the drilling fluid system described in embodiment 4, after 150 DEG C of aging 16h, still has good rheological and lower filter loss, illustrates that it has good high-temperature resistance.
Embodiment 10 water activity is tested
Wellbore fluid prepared by mensuration pure water and embodiment 1-4 ties up to the α at 25 DEG C
watervalue (water activity value), measurement result is in table 7.
The water activity value of table 7 embodiment 1-4 drilling fluid system
As can be seen from above-described embodiment, under the acting in conjunction of sodium-chlor and other treatment agents, drilling liquid water activity can be reduced to 0.63, is conducive to reducing the partial potential that water permeate to stratum, reduces the destruction of infiltration water formation, raising borehole wall stability.
The anti-inferior soil of embodiment 11 pollutes experiment
Calcium bentonite pollution experiment is carried out to drilling fluid system prepared by embodiment 4, be 100% by the quality adding water, by percentage to the quality, add the calcium bentonite of 2%, 4%, 6%, 8%, 10%, 12%, 14% respectively, according to the rheological before and after the method evaluation 120 DEG C of aging 16h in " GB/T 16783.1-2006 industrial gas oil drilling fluid on-the-spot test part 1: water-base drilling fluid " and API filtration, wherein location parameter has AV(apparent viscosity), PV(plastic viscosity), YP(yield value), FL
aPI(API filtration), measurement result is in table 8.
Base is starched: drilling fluid prepared by embodiment 4; 1#: base slurry+2% calcium bentonite; 2#: base slurry+4% calcium bentonite; 3#: base slurry+6% calcium bentonite; 4#: base slurry+8% calcium bentonite; 5#: base slurry+10% calcium bentonite; 6#: base slurry+12% calcium bentonite; 7#: base slurry+14% calcium bentonite.
The anticalcium wilkinite of table 8 embodiment 4 drilling fluid system pollutes experimental result
As can be seen from above-described embodiment, the wellbore fluid described in embodiment 4 still has manipulable rheological property after tying up to the calcium bentonite adding 14%.
Embodiment 12 calcium fouling resistance is tested
Sulfuric-resisting calcium contamination experiment is carried out to drilling fluid system prepared by embodiment 4, be 100% by the quality adding water, by percentage to the quality, add the calcium sulfate of 0.2%, 0.5%, 1.0%, 1.5%, 2.0%, 4.0% respectively, according to the rheological before and after the method evaluation 120 DEG C of aging 16h in " GB/T 16783.1-2006 industrial gas oil drilling fluid on-the-spot test part 1: water-base drilling fluid " and API filtration, wherein location parameter has AV(apparent viscosity), PV(plastic viscosity), YP(yield value), FL
aPI(API filtration), measurement result is in table 9.
Base is starched: drilling fluid system prepared by embodiment 4; 1#: base slurry+0.2% calcium sulfate; 2#: base slurry+0.5% calcium sulfate; 3#: base slurry+1.0% calcium sulfate; 4#: base slurry+1.5% calcium sulfate; 5#: base slurry+2.0% calcium sulfate; 6#: base slurry+4.0% calcium sulfate.
The calcium fouling resistance experimental result of table 9 embodiment 4 drilling fluid system
Found out by the experimental result of embodiment 11, embodiment 12, preferred drilling fluid composition, anticalcium wilkinite pollutes and reaches 14%, anti-gypsum pollutes and reach 4.0%, illustrate that the preferred drilling fluid system of the present invention has stronger contamination resistance.
Claims (10)
1. being applicable to a high-density water-based drilling fluid system for nonmarine deposit susceptibility shale formation, it is characterized in that, is 100% by the quality adding water, by percentage to the quality, containing following material:
Wilkinite 2-7%;
Sodium carbonate 0.1-0.3%;
Fluid loss agent 2%-8%;
High Temperature High Pressure fluid loss agent 2-5%;
Polymeric alcohol 3-5%;
Shutoff anti-sloughing agent 3-6%;
Aluminium base polymkeric substance 1-3%;
Shale control agent 0-2%;
Sodium-chlor 4-35%;
Sodium hydroxide 0.1-0.5%;
Lubricant 2-5%;
High-density weighting material 50-200%.
2. according to the drilling fluid system described in claim 1, it is characterized in that: the described high-density water-based drilling fluid system being applicable to nonmarine deposit susceptibility shale formation is prepared according to following step:
Step one, determines actual amount and the ratio of each treatment agent as the case may be;
Step 2, is added to the water wilkinite and sodium carbonate, prehydration process 24 hours;
Step 3, to in the bentonite slurry after prehydration, proportionally add fluid loss agent, High Temperature High Pressure fluid loss agent, polymeric alcohol, shutoff anti-sloughing agent, aluminium base polymkeric substance, shale control agent, sodium-chlor successively, and observe dissolving or the deployment conditions of often kind for the treatment of agent, after a kind for the treatment of agent fully dissolves or disperses, add lower a kind for the treatment of agent again, until all add;
Step 4, uses the alkaline conditioner of said ratio by between pH regulator to 8-10;
Step 5, adds lubricant and high-density weighting material, stirs 20min, makes drilling fluid density reach drilling well requirement.
3. drilling fluid system according to claim 1 and 2, is characterized in that: described fluid loss agent is one or more in small molecules co-polymer of sulfonate, low adhesive aggregation anionic cellulose, nitrile silicon polymer, hydrolyzed polyacrylonitrile ammonium salt, sulfonated lignite resin.
4. drilling fluid system according to claim 1 and 2, is characterized in that: described High Temperature High Pressure fluid loss agent is sulfonated-phenoformoldehyde resin for drilling fluid.
5. drilling fluid system according to claim 1 and 2, it is characterized in that: described polymeric alcohol is methyl alcohol, tetramethylolmethane etc. containing active hydrogen initiator and one or more in oxyethane, propylene oxide, butylene oxide ring, the liquid ether material that polyaddition reaction obtains under catalyst action.
6. drilling fluid system according to claim 1 and 2, is characterized in that: described shutoff anti-sloughing agent is one or more in latex bitumen, sulfonated gilsonite, asphalt powder.
7. drilling fluid system according to claim 1 and 2, is characterized in that: described aluminium base polymkeric substance is polymerize aluminum chloride and organic acid complex compound.
8. drilling fluid system according to claim 1 and 2, is characterized in that: described shale control agent is amido polyalcohols, is formed by one or more monomer condenses in organic amine and oxyethane, propylene oxide.
9. drilling fluid system according to claim 1 and 2, is characterized in that: described lubricant be mineral oil modified lubricant, plant oil modified lubricant, emulsified olefin, modified graphite, water base lubricant one or more.
10. drilling fluid system according to claim 1 and 2, is characterized in that: described high-density weighting material, comprises one or more in barite, powdered iron ore, limestone powder, trimanganese tetroxide.
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| CN105295863A (en) * | 2015-10-27 | 2016-02-03 | 中国石油天然气集团公司 | Water-based drilling fluid inhibitor and water-based drilling fluid and application thereof |
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| CN105400500A (en) * | 2015-12-26 | 2016-03-16 | 刘应才 | Preparation method of drilling liquid additive |
| CN105586019A (en) * | 2016-03-11 | 2016-05-18 | 西南石油大学 | Low-fluorescent anti-sloughing drilling fluid |
| CN106047316A (en) * | 2016-07-07 | 2016-10-26 | 中国石油集团川庆钻探工程有限公司 | Water-based drilling fluid suitable for high well temperature and low formation pressure coefficient |
| CN106190066A (en) * | 2016-07-07 | 2016-12-07 | 中国石油集团川庆钻探工程有限公司 | Water-based drilling fluid suitable for low well temperature and high formation pressure coefficient |
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