Two, background technology
Plugging agent and leakage-stop liquid that existing petroleum drilling uses, (1) bridging plug blocking agent is arranged, prescription is: wilkinite 1-5 part nut-shell 1-5 part mica 1-5 part, water is made into, its shortcoming or deficiency are the construction technology complexity, long construction period can only block up the bearing capacity that can not improve the stratum temporarily, and the leak stopping success ratio is low; (2) quick talking cement, filling a prescription is: 100 parts of oil well cements, water 40-50 part, setting accelerator 5-30 part, its shortcoming or deficiency are the cement density height, but thickening time, gelation time and pump time are difficult to control, grout very easily takes place run off fast or the fast setting problem, construction safety is difficult to guarantee; (3) DCM plugging agent, filling a prescription is: bridging agent 5-7 part, weighting agent 70-75 part, propping agent 1-5 part, 15 parts of tougheners, solidifying agent 0.1-0.5 part, its shortcoming or deficiency are only to be applicable to that the shutoff microfracture slightly misses the stratum.In a word, above-mentioned plugging agent function singleness, a little less than the adaptability, weak effect, use cost height, the blocking construction cycle is long, during the low-pressure stratum construction, density can not reduce, aggravation leakage degree, particularly those serious thief zones and leakage storage are caused severe contamination or injury with the stratum of layer, greatly reduce oil recovery factor.
Three, summary of the invention
The technical problem that the present invention solves provides a kind of improved drilling leakage blockage liquid or drilling fluid, and shortcoming or deficiency that it can overcome effectively or avoid existing in the above-mentioned prior art improve plugging effect and drilling speed effectively.
Drilling leakage blockage liquid of the present invention or drilling fluid, it consists of, weight part:
(A) base slurry: wilkinite 4-6 soda ash 0.2-0.3 water 100
(B) additive: 1. carry stick SD-LHV 0.5--3
2. fluid loss agent SK-II 0.5--2.5
3. flow pattern regulator SD-R 0.5--2.5
4. density adjuster SD-D 0.5--5
5. fill strengthening agent MF-1 2--8
6. linking agent MD-III 2--15
7. bridging agent MD-II 8--20
Wherein, the described stick SD-LHV that carries, content 0.5-3 part, by the ratio of CMC: XC: HEC=0.5-2: 1-3: 0.5-2 combined efficiently carry stick.Described fluid loss agent SK-II, content 0.5-2.5 part is acrylic-multipolymer.Described flow pattern regulator SD-R, content 0.5-2.5 part is combined by the ratio of ammonium salt: XY-27: 80A-51=3-7: 6-10: 3-7.Described density adjuster SD-D, content 0.5-5 part is combined by the ratio of ABS: AS: F873=2-4: 2-4: 6-10.Described filling strengthening agent MF-1, content 2-8 part, by calcium carbonate superfine powder: the ratio of oil-soluble resin: silicate=2-4: 3-6: 5-10 is combined.Described linking agent MD-III, content 2-15 part, by furfural: the ratio of particle shell: vegetable fibre=3-7: 4-8: 1-5 is combined.The bridging agent MD-II of institute, content 8-20 part, by sawdust: the ratio of cotton seed hull: corn cob=6-10: 4-8: 3-7 is combined.
Compound method: conventional compound method preparation.Preparation (A) adds (B) in (A) more successively earlier.
The present invention has following advantage or beneficial effect compared with prior art:
1, function is many, adaptability is strong, both can be used as leakage-stop liquid, can be used as drilling fluid again, both can apply to the low pressure weak zone, can apply to most permeable zone, solution cavity type stratum, crack again, and leaks storage with layer.
2, adopted the leak-stopping additive,, in leakage channel, formed the shutoff barrier fast, improved reinforcement ability and bearing capacity, reached more than 98% according to the measuring and calculating sealing ratiod as efficient linking agent, filling strengthening agent.
3, have leakproof, leak stopping, leakage function, can improve drilling speed, can improve leakage strata drilling speed more than 50% according to measuring and calculating.
4, the Auto-regulating System of Density of Heavy Medium scope is wide, can reduce density in the low-pressure stratum construction.
5, improve the repair ability and the cementing quality on leakage stratum, electrical measurement success ratio and well cementation good rate equal 100% are up to standard.
6, leak storage and have selectivity, block drop ply with layer leak stopping, the protection oil reservoir, use cost is low.
7, can simplify the serious thief zone drilling program.
8, be the drilling fluid flow pattern of high-ductility, low power.
Five, embodiment:
By drilling leakage blockage liquid of the present invention or drilling fluid, it consists of, weight part:
(A) base slurry: wilkinite 4-6 soda ash 0.2-0.3 water 100
(B) additive: 1. carry stick SD-LHV 0.5--3
2. fluid loss agent SK-II 0.5-2.5
3. flow pattern regulator SD-R 0.5-2.5
4. density adjuster SD-D 0.5-5
5. fill strengthening agent MF-1 2-8
6. linking agent MD-3 2-15
7. bridging agent MD-2 8-20
Compound method: conventional compound method preparation.Preparation (A) earlier adds in (A) with (B) more successively:
The 1st example
(A) base slurry: wilkinite 4 soda ash 0.2 water 100
(B) additive:
1. carry 0.5 part of stick SD-LHV, combined by the ratio of CMC (Xylo-Mucine): XC (biological polymer): HEC (Natvosol)=0.5: 1: 0.5;
2. fluid loss agent SK-II is an acrylic-multipolymer, is 0.5 part;
3. flow pattern regulator SD-R is 0.5 part, and is combined by the ratio of ammonium salt (hydrolyzed polyacrylonitrile ammonium salt): XY-27 (vinyl monomer multiple copolymer): 80A-51 (acrylamide propylene sodium multipolymer)=3: 6: 3;
4. density adjuster SD-D is 0.5 part, and is combined by the ratio of ABS (Sodium dodecylbenzene sulfonate): AS (alkyl sodium sulfonate): F873 (mixture of Oleum Cocois single ethanol amide sulfonation coral amber acid esters disodium salt and fatty alcohol-ether sulfonation coral amber acid esters disodium salt)=2: 2: 6;
5. fill strengthening agent MF-12 part, by calcium carbonate superfine powder: oil-soluble resin (paraffin): the ratio of silicate (water glass)=2: 3: 5 is combined;
6. linking agent MD-III is 2 parts, and by furfural: rice husk: the ratio of vegetable fibre (unginned cotton)=3: 4: 1 is combined;
7. bridging agent MD-II is 8 parts, and by sawdust: cotton seed hull: the ratio of corn cob=6: 4: 3 is combined.
The 2nd example
(A) base slurry: wilkinite 4 soda ash 0.2 water 100
(B) additive:
1. carry 2 parts of stick SD-LHV, combined by the ratio of CMC (Xylo-Mucine): XC (biological polymer): HEC (Natvosol)=1: 2: 1;
2. fluid loss agent SK-II is 1.2 parts;
3. flow pattern regulator SD-R is 1.5 parts, and is combined by the ratio of ammonium salt (hydrolyzed polyacrylonitrile ammonium salt): XY-27 (vinyl monomer multiple copolymer): 80A-51 (acrylamide propylene sodium multipolymer)=4: 8: 5;
4. density adjuster SD-D is 2.5 parts, and is combined by the ratio of ABS (Sodium dodecylbenzene sulfonate): AS (alkyl sodium sulfonate): F873 (mixture of Oleum Cocois single ethanol amide sulfonation coral amber acid esters disodium salt and fatty alcohol-ether sulfonation coral amber acid esters disodium salt)=3: 3: 8;
5. fill strengthening agent MF-15 part, by calcium carbonate superfine powder (460 order): oil-soluble resin (paraffin): the ratio of silicate (water glass)=3: 4.5: 8 is combined;
6. linking agent MD-III is 9 parts, and by furfural: particle shell (rice husk): the ratio of vegetable fibre (unginned cotton)=4: 6: 3 is combined;
7. bridging agent MD-II is 15 parts, and by sawdust: cotton seed hull: the ratio of corn cob=8: 6: 4 is combined.
The 3rd example
(A) base slurry: wilkinite 4 soda ash 0.3 water 100
(B) additive:
1. carry 3 parts of stick SD-LHV, combined by the ratio of CMC (Xylo-Mucine): XC (biological polymer): HEC (Natvosol)=2: 3: 2;
2. fluid loss agent SK-II is 2.5 parts;
3. flow pattern regulator SD-R is 2.5 parts, and is combined by the ratio of ammonium salt (hydrolyzed polyacrylonitrile ammonium salt): XY-27 (vinyl monomer multiple copolymer): 80A-51 (acrylamide propylene sodium multipolymer)=7: 10: 7;
4. density adjuster SD-D is 5 parts, and is combined by the ratio of ABS (Sodium dodecylbenzene sulfonate): AS (alkyl sodium sulfonate): F873 (mixture of Oleum Cocois single ethanol amide sulfonation coral amber acid esters disodium salt and fatty alcohol-ether sulfonation coral amber acid esters disodium salt)=4: 6: 10;
5. fill strengthening agent MF-18 part, by calcium carbonate superfine powder: oil-soluble resin (paraffin): the ratio of silicate (water glass)=4: 6: 10 is combined;
6. linking agent MD-III is 15 parts, and by furfural: particle shell (rice husk): the ratio of vegetable fibre (unginned cotton)=7: 8: 5 is combined;
7. bridging agent MD-II is 20 parts, and by sawdust: cotton seed hull: the ratio of corn cob=10: 8: 7 is combined.
The 4th example
(A) base slurry: wilkinite 5 soda ash 0.3 water 100
(B) additive:
1. carry 0.8 part of stick SD-LHV, by CMC (Xylo-Mucine): XC (biological polymer): HEC (Natvosol)=1: 2: the ratio of I was combined;
2. fluid loss agent SK-II is 1.0 parts;
3. flow pattern regulator SD-R is 1.0 parts, and is combined by the ratio of ammonium salt (hydrolyzed polyacrylonitrile ammonium salt): XY-27 (vinyl monomer multiple copolymer): 80A-51 (acrylamide propylene sodium multipolymer)=5: 8: 5;
4. density adjuster SD-D is 3 parts, and is combined by the ratio of ABS (Sodium dodecylbenzene sulfonate): AS (alkyl sodium sulfonate): F873 (mixture of Oleum Cocois single ethanol amide sulfonation coral amber acid esters disodium salt and fatty alcohol-ether sulfonation coral amber acid esters disodium salt)=3: 3: 8;
5. fill strengthening agent MF-15 part, by calcium carbonate superfine powder: oil-soluble resin (paraffin): the ratio of silicate (water glass)=3: 5: 8 is combined;
6. linking agent MD-III is 5 parts, and by furfural: rice husk: the ratio of vegetable fibre (unginned cotton)=5: 6: 3 is combined;
7. bridging agent MD-II is 10 parts, and by sawdust: cotton seed hull: the ratio of corn cob=8: 6: 5 is combined.More than each example be conventional preparation, wherein, the 1st example, the 2nd example, the 3rd example are embodiment, the 4th example is a comparative example, its every performance test data such as following table:
Embodiment |
Sealing ratiod % |
Bearing capacity MPa |
Suspension stability h |
Auto-regulating System of Density of Heavy Medium rate % |
The molten rate % of acid |
The 1st example |
96 |
20 |
200 |
25 |
92 |
The 2nd example |
98 |
20 |
220 |
28 |
93 |
The 3rd example |
99 |
20 |
240 |
29 |
91 |
The 4th example |
97 |
20 |
210 |
26 |
90 |
As seen from the above table, no matter the present invention as leakage-stop liquid, still is that performance all is superior as drilling fluid.