CN116925714A - Low-density solid-phase drilling fluid for middle-deep complex well bore and application thereof - Google Patents
Low-density solid-phase drilling fluid for middle-deep complex well bore and application thereof Download PDFInfo
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- 238000005553 drilling Methods 0.000 title claims abstract description 221
- 239000012530 fluid Substances 0.000 title claims abstract description 126
- 239000007790 solid phase Substances 0.000 title claims abstract description 24
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims abstract description 65
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 63
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 38
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 34
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 26
- 239000001103 potassium chloride Substances 0.000 claims abstract description 26
- 235000011164 potassium chloride Nutrition 0.000 claims abstract description 26
- 229920005614 potassium polyacrylate Polymers 0.000 claims abstract description 25
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims abstract description 24
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000001768 carboxy methyl cellulose Substances 0.000 claims abstract description 22
- 229920002239 polyacrylonitrile Polymers 0.000 claims abstract description 22
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims abstract description 22
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims abstract description 22
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229920002678 cellulose Polymers 0.000 claims abstract description 21
- 239000001913 cellulose Substances 0.000 claims abstract description 21
- 235000011121 sodium hydroxide Nutrition 0.000 claims abstract description 21
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000000292 calcium oxide Substances 0.000 claims abstract description 20
- 239000010426 asphalt Substances 0.000 claims abstract description 19
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000314 lubricant Substances 0.000 claims abstract description 15
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 13
- 235000017550 sodium carbonate Nutrition 0.000 claims abstract description 9
- 239000012459 cleaning agent Substances 0.000 claims abstract description 8
- 150000003863 ammonium salts Chemical class 0.000 claims abstract description 3
- 229910000281 calcium bentonite Inorganic materials 0.000 claims abstract description 3
- 239000002131 composite material Substances 0.000 claims abstract description 3
- -1 compound ammonium salt Chemical class 0.000 claims description 34
- 239000000440 bentonite Substances 0.000 claims description 22
- 229910000278 bentonite Inorganic materials 0.000 claims description 22
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 22
- 239000004576 sand Substances 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 10
- 238000009472 formulation Methods 0.000 claims description 8
- 239000003638 chemical reducing agent Substances 0.000 claims description 7
- 239000000706 filtrate Substances 0.000 claims description 7
- 229920003023 plastic Polymers 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 5
- 230000000153 supplemental effect Effects 0.000 claims description 2
- 230000003301 hydrolyzing effect Effects 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 20
- 238000005520 cutting process Methods 0.000 abstract description 10
- 231100000252 nontoxic Toxicity 0.000 abstract 1
- 230000003000 nontoxic effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 17
- 239000002002 slurry Substances 0.000 description 16
- 239000011575 calcium Substances 0.000 description 15
- 230000007062 hydrolysis Effects 0.000 description 11
- 238000006460 hydrolysis reaction Methods 0.000 description 11
- 239000011435 rock Substances 0.000 description 7
- 239000013256 coordination polymer Substances 0.000 description 6
- 239000011148 porous material Substances 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 239000003995 emulsifying agent Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 229910001414 potassium ion Inorganic materials 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 239000010454 slate Substances 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- 239000002199 base oil Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 230000001502 supplementing effect Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 231100000956 nontoxicity Toxicity 0.000 description 2
- 229920000447 polyanionic polymer Polymers 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000000080 wetting agent Substances 0.000 description 2
- 101001018064 Homo sapiens Lysosomal-trafficking regulator Proteins 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 102100033472 Lysosomal-trafficking regulator Human genes 0.000 description 1
- 235000010703 Modiola caroliniana Nutrition 0.000 description 1
- 244000038561 Modiola caroliniana Species 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000003042 antagnostic effect Effects 0.000 description 1
- 235000012216 bentonite Nutrition 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000000375 suspending agent Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
Classifications
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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
-
- 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
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
-
- 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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- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Earth Drilling (AREA)
Abstract
The low-density solid-phase drilling fluid for the middle-deep complex well bore is water-based, and comprises the following components: calcium bentonite, caustic soda, sodium carbonate, sodium carboxymethyl cellulose, potassium polyacrylate, hydrolyzed polyacrylonitrile composite ammonium salt, polyanionic cellulose, potassium chloride, sulfonated asphalt, superfine calcium carbonate, calcium oxide, barite powder, anti-sticking agent, cleaning agent and lubricant. The invention also comprises application of the low-density solid-phase drilling fluid for the middle-deep complex well bore. The low-density solid-phase water-based drilling fluid disclosed by the invention is nontoxic and environment-friendly, can protect the well wall, is controllable in fluid loss, enhances the cuttings carrying capacity, reduces the probability of sticking accidents in the process of lowering a drilling tool or a casing, improves the drilling efficiency, reduces the accidents in the well, and simultaneously saves the engineering cost.
Description
Technical Field
The invention relates to a drilling fluid and application thereof, in particular to a low-density solid-phase drilling fluid and application thereof.
Background
In recent years, the development and utilization of geothermal energy have been highly emphasized, and particularly, the development of geothermal energy has been rapid in the fields such as isthmus, shandong, hebei, tianjin and the like. The initial investment of the geothermal energy of the middle and deep layer is large, the drilling cost accounts for 50-70% of the whole supply system, and one of the most important works in the whole drilling system is called drilling fluid with drilling blood. At present, the drilling fluid is commonly used in two types of water-based type and oil-based type, the traditional low-density solid-phase drilling fluid is more used in petroleum and shale gas well formation, mainly aims at solving the problems of cuttings carrying and stable safety of the hole wall, has a narrow application range, and needs to adjust or replace the drilling fluid system in real time according to different drilling conditions, so that the drilling safety risk is increased in the deep well drilling process.
CN113088268A discloses an oil-based drilling fluid composition, an oil-based drilling fluid, and a preparation method and application thereof; the oil-based drilling fluid composition comprises a base fluid and a treating agent, wherein the base fluid comprises base oil and an inhibitor; the treating agent comprises organic soil, a main emulsifier, an auxiliary emulsifier, a plugging agent, a weighting agent, a wetting agent, an alkaline regulator and a filtrate reducer; the base oil-based waterproof adhesive comprises, by weight, 100 parts of base oil, 5-25 parts of an inhibitor, 5-12 parts of organic soil, 1-6 parts of a main emulsifier, 2-8 parts of an auxiliary emulsifier, 3-18 parts of a plugging agent, 5-30 parts of a weighting agent, 2-6 parts of a wetting agent, 2-7 parts of an alkaline regulator and 2-10 parts of a filtrate reducer. The drilling fluid is difficult to exert the effect of improving the drilling efficiency on the rock stratum with strong abrasive property.
Disclosure of Invention
The invention aims to solve the technical problems, overcome the defects in the prior art and provide low-density solid-phase drilling fluid for middle-deep complex well bores with high drilling efficiency and application thereof.
The technical scheme adopted for solving the technical problems is as follows: a low-density solid-phase drilling fluid for middle-deep complex well bores, which is water-based,the formula comprises: calcareous bentonite, caustic soda, sodium carbonate, sodium carboxymethylcellulose (CMC-Na), potassium polyacrylate (K-PAM), and hydrolyzed polyacrylonitrile compound ammonium salt (NH) 4 HPAN), polyanionic cellulose (PAC), potassium chloride (KCl), sulfonated asphalt (SHA), ultrafine calcium carbonate (Ca) 2 CO 3 ) Calcium oxide, barite powder (BaSO) 4 ) Anti-seize agent, cleaning agent, lubricant.
The functions of each component include:
calcareous bentonite: improving hydration and dispersion properties of bentonite, increasing slurry-making rate and consistency of bentonite, and removing Ca in drilling fluid 2+ The performance of the drilling fluid is improved;
caustic soda: the concentration of cations can be controlled, and the pH value can be adjusted;
soda ash: promoting hydration of bentonite and controlling Ca 2+ The content is as follows;
sodium carboxymethyl cellulose (CMC-Na): the slurry preparation method is characterized in that the slurry preparation method comprises the steps of suspending agent, plugging agent and thickening agent, so that the slurry preparation rate can be improved, the fluid loss is controlled, and the apparent viscosity of well fluid is improved;
potassium polyacrylate (K-PAM): the anti-collapse agent has an upward anti-collapse effect on sandstone and shale;
hydrolysis polyacrylonitrile compound ammonium salt (NH) 4 -HPAN): the drilling fluid rheological property is changed, so that the anti-collapse effect is realized, the drilling speed can be increased, and the sticking accident is reduced;
polyanionic cellulose (PAC): is a tackifier, and has the effect of reducing the filtration loss;
potassium chloride (KCl): the potassium ions in the drilling fluid are inorganic treating agents, so that hydration and expansion of the water-sensitive stratum can be effectively inhibited, and collapse of the water-sensitive stratum is prevented;
sulfonated asphalt (SHA): the mud cake lubricity is improved, the resistance and torsion of a drilling tool are reduced, the service life of a drill bit can be prolonged, and the anti-blocking and anti-blocking effects are realized;
superfine calcium carbonate (CaCO) 3 ): the limestone powder is insoluble in water, can supplement the drilling fluid loss to block the stratum pores, and is used for well fluid weighting;
calcium oxide (CaO): is inorganic treating agent, and can be mixed with water to obtain turbid suspension for controlling Na + And the concentration of calcium montmorillonite；
Barite powder (BaSO) 4 ): increasing the density of the drilling fluid and increasing the pressure of the drilling fluid column;
anti-sticking agent: the lubricating agent has the functions of dispersing lubrication and reducing friction resistance, improves the fluidity of drilling fluid, and prevents filter cakes from adhering to a drill sticking.
By adopting the technical means, the drilling efficiency can be improved, the accidents in the well can be reduced, and meanwhile, the engineering cost can be saved.
Preferably, the low density solid phase drilling fluid for middle and deep complex wellbores is 1m each 3 The volume formula comprises:
calcareous bentonite: 20-28 kg;
1.5-9 kg of caustic soda;
1-6 kg of sodium carbonate;
1-6 kg of sodium carboxymethylcellulose (CMC-Na);
3-6 kg of potassium polyacrylate (K-PAM);
hydrolysis polyacrylonitrile compound ammonium salt (NH) 4 -HPAN）5~12kg；
10-25 kg of polyanionic cellulose (PAC);
35-80 kg of potassium chloride (KCl);
10-25 kg of sulfonated asphalt (SHA);
superfine calcium carbonate (Ca) 2 CO 3 ）10~28kg；
0.5-3 kg of calcium oxide;
barite powder (BaSO) 4 ）0.06~0.3kg；
1.6-6 kg of anti-sticking agent.
By adopting the technical means, the drilling efficiency can be improved, the accidents in the well can be reduced, and meanwhile, the engineering cost can be saved.
Preferably, the weight ratio of sodium carboxymethylcellulose (CMC-Na) to potassium polyacrylate (K-PAM) is 0.3-0.9:1.
Preferably, the potassium polyacrylate (K-PAM) is combined with the hydrolyzed polyacrylonitrile compound ammonium salt (NH) 4 HPAN) is 0.3-0.6:1 by weight.
Preferably, the total weight of sodium carboxytetramethyl cellulose (CMC-Na), potassium polyacrylate (K-PAM) and the hydrolyzed polyacrylonitrile compound ammonium salt (NH) 4 -HPAN) is 0.6~1∶1。
CMC-Na，K-PAM，NH 4 The HPAN materials have certain interactions, and the optimal effects of the materials can be exerted by the above proportions in the formula.
Preferably, the formulation of the drilling fluid is adjusted according to the effective drilling fluid state in the well during the drilling process: the judging conditions are as follows:
(1) The density is less than or equal to 1.15g/cm 3 The funnel viscosity is less than or equal to 40, the S, pH value is less than or equal to 6.5, and the outlet temperature is less than or equal to 32 ℃;
(2) The density is more than 1.15 and less than or equal to 1.25g/cm 3 The viscosity of the funnel is more than 40 and less than or equal to 50S, the pH value is more than 6.5 and less than or equal to 7.2, the outlet temperature is more than 32 and less than or equal to 36 ℃;
(3) Density > 1.25g/cm 3 The funnel viscosity is more than 50, the S, pH value is more than 7.2, and the outlet temperature is more than 36 ℃;
when all or part of the conditions are met in (3), using formula C; when the unconditional meets the condition (3) and all or part of the conditions meet the condition (2), using the formula B; when all conditions are met in (1), formula A is used;
the formula A comprises:
calcareous bentonite: 21-23 kg/m 3 ；
1.9-2.3 kg/m caustic soda 3 ；
1.2-1.4 kg/m of sodium carbonate 3 ；
Sodium carboxymethylcellulose (CMC-Na) 1.16-1.24 kg/m 3 ；
Potassium polyacrylate (K-PAM) 3.3-3.7 kg/m 3 ；
Hydrolysis polyacrylonitrile compound ammonium salt (NH) 4 -HPAN）5.6~6.4kg/m 3 ；
Polyanionic cellulose (PAC) 11-13 kg/m 3 ；
Potassium chloride (KCl) 39-41 kg/m 3 ；
Sulfonated asphalt (SHA) 10.4-11.6 kg/m 3 ；
Superfine calcium carbonate (Ca) 2 CO 3 ）11~13kg/m 3 ；
0.7-0.9 kg/m of calcium oxide 3 ；
Barite powder (BaSO) 4 ）0.06~0.07kg/m 3 ；
Anti-seize agent 1.7-2.5 kg/m 3 ；
The formula B comprises:
calcareous bentonite: 23-25 kg/m 3 ；
Caustic soda 2.3-2.7 kg/m 3 ；
1.7-1.9 kg/m of sodium carbonate 3 ；
Sodium carboxymethylcellulose (CMC-Na) 1.96-2.04 kg/m 3 ；
Potassium polyacrylate (K-PAM) 3.3-3.7 kg/m 3 ；
Hydrolysis polyacrylonitrile compound ammonium salt (NH) 4 -HPAN）7.6~8.4kg/m 3 ；
Polyanionic cellulose (PAC) 14-16 kg/m 3 ；
41-43 kg/m of potassium chloride (KCl) 3 ；
12.4-13.6 kg/m sulfonated asphalt (SHA) 3 ；
Superfine calcium carbonate (Ca) 2 CO 3 ）15~17kg/m 3 ；
0.9-1.1 kg/m of calcium oxide 3 ；
Barite powder (BaSO) 4 ）0.065~0.075kg/m 3 ；
Anti-sticking agent 2.2-3 kg/m 3 ；
The formula C comprises:
calcareous bentonite: 24-26 kg/m 3 ；
Caustic soda 2.8-3.2 kg/m 3 ；
1.9-2.1 kg/m of sodium carbonate 3 ；
Sodium carboxymethylcellulose (CMC-Na) 2.46-2.54 kg/m 3 ；
Potassium polyacrylate (K-PAM) 3.6-4 kg/m 3 ；
Hydrolysis polyacrylonitrile compound ammonium salt (NH) 4 -HPAN）8.1~8.9kg/m 3 ；
Polyanionic cellulose (PAC) 19-21 kg/m 3 ；
Potassium chloride (KCl) 49-51 kg/m 3 ；
14.4-15.6 kg/m sulfonated asphalt (SHA) 3 ；
Superfine calcium carbonate (Ca) 2 CO 3 ）19~21kg/m 3 ；
1.5-1.7 kg/m of calcium oxide 3 ；
Barite powder (BaSO) 4 ）0.105~0.115kg/m 3 ；
3.1-3.9 kg/m of anti-sticking agent 3 。
In the drilling process, the formula A, B, C can be prepared on the basis of the existing effective drilling fluid components in the well, and the formula can be quickly switched according to the monitoring condition in the drilling process, so that trial-and-distribution time is shortened, and working efficiency is greatly improved. For geological conditions of different well drilling, different basic configuration materials can be used first, and after drilling to a certain depth, the same formula A, B, C can be adopted, so that the construction is more convenient.
The effective drilling fluid state in the well can be measured by the following method, and other accurate measurement modes are also feasible:
the density can be measured by YM type liquid densitometer;
funnel viscosity can be measured using an MK-03 type six-speed rotational viscometer;
the pH value can be measured by adopting an Asmik liquid pH meter;
the outlet temperature may be measured using an RS-WD-HW infrared temperature sensor.
By adopting the technical means, the drilling fluid formula can be further optimized for different conditions.
Preferably, the formulation of the drilling fluid further comprises: cleaning agent 2-3 kg/m 3 Lubricant 5-10 kg/m 3 Anti-collapse filtrate reducer 15-20 kg/m 3 。
By adopting the technical means, the formula of the drilling fluid is more reasonable.
Preferably, the additional value of the drilling fluid density is 0.05-0.10g/cm 3 。
By adopting the technical means, the drilling effect is good.
Preferably, the anti-sticking agent is CP233 anti-sticking agent.
By adopting the technical means, the drilling effect is good.
Aiming at the application of the low-density solid-phase drilling fluid of the middle-deep complex well bore, after drilling to the depth of 100m, 2.5-4 kg of polyanion cellulose, more preferably 2.8-3.2 kg, is added into the drilling fluid every time when drilling is 1 m.
By adopting the technical means, the drilling effect is good.
Preferably, each time the drilling depth is increased by 100 meters, the drilling fluid density is increased by 0.04-0.06 g/cm 3 Until the density of the drilling fluid reaches 1.45-1.55 g/cm 3 。
By adopting the technical means, the method is beneficial to antagonizing the formation pressure and has better drilling effect.
Preferably, increasing the drilling fluid density is achieved by the supplemental addition of barite powder.
By adopting the technical means, the density of the drilling fluid in the well can be well controlled.
Preferably, 8-15 kg of lubricant, more preferably 9-11 kg of lubricant is added to the drilling fluid in a supplementary manner every 100 meters in drilling depth.
By adopting the technical means, the drilling effect is good.
Preferably, KCl is supplemented when the KCl content in the well effective drilling fluid is less than 6%.
By adopting the technical means, the drilling effect is good.
Preferably, the sand content of the effective drilling fluid in the well is controlled to be less than 0.2% by the sand remover.
By adopting the technical means, the solid phase content in the drilling fluid in the well can be controlled, and the drilling effect is better.
Preferably, the dynamic shear force of the effective drilling fluid in the well is controlled to be not less than 5 and the plastic viscosity is controlled to be not less than 10 by a six-speed rotary viscometer. When the dynamic shear force and viscosity are too small, the properties of the slurry will be affected.
By adopting the technical means, the sand carrying performance of the drilling fluid and the safety in the well are improved, and the drilling fluid has a good drilling effect.
The formula of the invention aims at the problems that in the drilling process of a long straight section complex well hole with two open holes, the sandstone is clamped with calcium fine sandstone and mudstone with higher grinding degree, conglomerate and sandstone stratum, an improved low-density solid phase water-based drilling fluid formula is adopted, and the materials such as calcium bentonite, sodium carboxymethyl cellulose, potassium polyacrylate, hydrolyzed polyacrylonitrile composite ammonium salt, polyanion cellulose, potassium chloride, sulfonated asphalt, superfine carbonic acid, barite powder, anti-seizing agent and the like are utilized.
The related information of projects, including regional stratum lithology and layering, adjacent stratum pore pressure, well completion report, drilling fluid system and performance, complicated well section treatment measures, ground temperature and other related data, should be collected in advance before drilling. The requirements for key parameter control in the geological design of the project geothermal well are familiar, and the situation that the well track is tested by wireless while-drilling equipment in the drilling process comprises a deflecting point, a deflecting rate and water level displacement information is familiar.
The drilling fluid has the advantages of keeping the well wall stable, controlling the fluid loss, improving the cuttings carrying capacity, reducing sticking accidents in the process of lowering a drilling tool or a casing, improving the drilling efficiency, reducing accidents in the well, saving the engineering cost and the like, and is suitable for the drilling process of long straight open hole sections of medium-deep geothermal drilling.
The drilling fluid is based on the long straight section complex well drilling process, can overcome the safety problem of rock debris returning to the wall of a borehole, can also be based on the characteristics of considering drilling efficiency and sticking accidents of the downward release of a drilling tool, and has the advantages of cleanness, non-toxicity and environmental protection.
The invention has the beneficial effects that:
the invention adopts a low-density solid phase water-based drilling liquid formula, has no toxicity and environmental protection, can protect the well wall, has controllable filtration loss, enhances the cuttings carrying capacity, reduces the probability of sticking accidents in the process of lowering a drilling tool or a casing, improves the drilling efficiency, reduces the accidents in the well, and simultaneously saves the engineering cost.
Detailed Description
The invention is further illustrated by the following examples.
The starting materials used in the examples of the present invention were all obtained by conventional commercial means.
Example 1
The method comprises the steps of pre-collecting project related information before drilling, wherein the project related information comprises regional stratum lithology and layering, adjacent well stratum pore pressure, drilling and completion reports, drilling fluid systems and performances, and related information such as treatment measures of complex well sections, ground temperature and the like. The requirements for key parameter control in the geological design of the project geothermal well are familiar, and the situation that the well track is tested by wireless while-drilling equipment in the drilling process comprises a deflecting point, a deflecting rate and water level displacement information is familiar.
The open hole long straight section of the project is 100-2000m, a PDC drill bit with the diameter of 215.9mm is adopted for drilling, the outer diameter of a drill rod is 127mm, the inner diameter of the drill rod is 108mm, the drilling meets the stratum and is that thick layer-shaped calcareous fine sandstone sandy mudstone is sandwiched in the mauve of a chalk system, calcareous argy cement is glued, partial sandy stone is sandwiched with calcareous siltsstone, thick layer-shaped siltstone slate sandy slate is sandwiched in the lower brook group, and the like; the stratum pressure coefficient is 1.02, and a water-based drilling fluid system is adopted.
The formula of the drilling fluid comprises:
calcareous bentonite: 25kg/m 3 ；
Caustic soda 3kg/m 3 ；
Soda 2kg/m 3 ；
Sodium carboxymethylcellulose (CMC-Na) 2.5kg/m 3 ；
Potassium polyacrylate (K-PAM) 3.8kg/m 3 ；
Hydrolysis polyacrylonitrile compound ammonium salt (NH) 4 -HPAN）8.5kg/m 3 ；
Polyanionic cellulose (PAC) 20kg/m 3 ；
Potassium chloride (KCl) 50kg/m 3 ；
Sulfonated asphalt (SHA) 15kg/m 3 ；
Superfine calcium carbonate (Ca) 2 CO 3 ）20kg/m 3 ；
Calcium oxide 1.6kg/m 3 ；
Barite powder (BaSO) 4 ）0.11kg/m 3 ；
Anti-sticking agent (CP 233) 3.5kg/m 3 ；
2kg/m of cleaning agent 3 5kg/m of lubricant 3 Anti-collapse filtrate reducer 15kg/m 3 ；
The additional value of the drilling fluid density is 0.06g/cm 3 。
When drilling to a depth of 100m, the effective drilling fluid quantity in the well is 5m 3 Adding bentonite to 125kg, CMC-Na12.5kg, K-PAM 19 kg, NH 4 HPAN 42.5kg, caustic soda 15kg, soda 10kg, PAC100kg, KCl250kg, SHA75kg, ca 2 CO 3 100kg of calcium oxide 8kg of BaSO 4 0.55kg, CP23317.5kg. Testing the index Density of the main slurry to be 1.26g/cm 3 Continuously drilling downwards at the funnel viscosity of 52S, pH value of 7.3 and the outlet temperature of 36.4 ℃, monitoring the state of the effective drilling fluid in the well in the drilling process in real time, adjusting the formula of the newly added drilling fluid, and judging the conditions as follows:
(1) The density is less than or equal to 1.15g/cm 3 The funnel viscosity is less than or equal to 40, the S, pH value is less than or equal to 6.5, and the outlet temperature is less than or equal to 32 ℃;
(2) The density is more than 1.15 and less than or equal to 1.25g/cm 3 The viscosity of the funnel is more than 40 and less than or equal to 50S, the pH value is more than 6.5 and less than or equal to 7.2, the outlet temperature is more than 32 and less than or equal to 36 ℃;
(3) Density > 1.25g/cm 3 The funnel viscosity is more than 50, the S, pH value is more than 7.2, and the outlet temperature is more than 36 ℃;
when all or part of the conditions are met in (3), using formula C; when the unconditional meets the condition (3) and all or part of the conditions meet the condition (2), using the formula B; when all conditions are met in (1), formula A is used;
the formula A comprises:
calcareous bentonite: 22kg/m 3 ；
Caustic soda 2.1kg/m 3 ；
Soda 1.3kg/m 3 ；
Sodium carboxymethylcellulose (CMC-Na) 1.2kg/m 3 ；
Potassium polyacrylate (K-PAM) 3.5kg/m 3 ；
Hydrolysis polyacrylonitrile compound ammonium salt (NH) 4 -HPAN）6kg/m 3 ；
Polyanionic cellulose (PAC) 12kg/m 3 ；
40kg/m of potassium chloride (KCl) 3 ；
Sulfonated asphalt (SHA) 11kg/m 3 ；
Superfine calcium carbonate (Ca) 2 CO 3 ）12kg/m 3 ；
Calcium oxide 0.8kg/m 3 ；
Barite powder (BaSO) 4 ）0.065kg/m 3 ；
Anti-sticking agent (CP 233) 2.1kg/m 3 ；
The formula B comprises:
calcareous bentonite: 24kg/m 3 ；
Caustic soda 2.5kg/m 3 ；
Soda 1.8kg/m 3 ；
Sodium carboxymethylcellulose (CMC-Na) 2kg/m 3 ；
Potassium polyacrylate (K-PAM) 3.5kg/m 3 ；
Hydrolysis polyacrylonitrile compound ammonium salt (NH) 4 -HPAN）8kg/m 3 ；
Polyanionic cellulose (PAC) 15kg/m 3 ；
Potassium chloride (KCl) 42kg/m 3 ；
Sulfonated asphalt (SHA) 13kg/m 3 ；
Superfine calcium carbonate (Ca) 2 CO 3 ）16kg/m 3 ；
Calcium oxide 1kg/m 3 ；
Barite powder (BaSO) 4 ）0.07kg/m 3 ；
Anti-sticking agent (CP 233) 2.6kg/m 3 ；
The formula C comprises:
calcareous bentonite: 25kg/m 3 ；
Caustic soda 3kg/m 3 ；
Soda 2kg/m 3 ；
Sodium carboxymethylcellulose (CMC-Na) 2.5kg/m 3 ；
Potassium polyacrylate (K-PAM) 3.8kg/m 3 ；
Hydrolysis polyacrylonitrile compound ammonium salt (NH) 4 -HPAN）8.5kg/m 3 ；
Polyanionic cellulose (PAC) 20kg/m 3 ；
Potassium chloride (KCl) 50kg/m 3 ；
Sulfonated asphalt (SHA) 15kg/m 3 ；
Superfine calcium carbonate (Ca) 2 CO 3 ）20kg/m 3 ；
Calcium oxide 1.6kg/m 3 ；
Barite powder (BaSO) 4 ）0.11kg/m 3 ；
Anti-sticking agent (CP 233) 3.5kg/m 3 。
In the down-drilling process, CMC-Na, K-PAM and NH are maintained according to the volume ratio 4 Size molecular polymers of HPAN are used in combination. Every 1m downwards drilling is carried out, and every 1 hour, the slurry index value is tested, and when the slurry index value is based on a normal value, 3kg PAC is added every 1m downwards drilling, so that a better mud cake can be formed, and the loss of drilling fluid is reduced.
With the increase of drilling depth, in order to prevent well collapse and reduce lost circulation and promote the capacity of drilling fluid for carrying rock cuttings, the drilling fluid density is increased by 0.05g/cm every 100 meters of drilling depth 3 By supplementing the barite powder until the density reaches 1.50g/cm 3 After that, the density was kept at 1.50g/cm 3 No longer increases; while 10kg of lubricant was added per 100 meters. The content of chloride ions and potassium ions is detected periodically every 1-2 hours, so that the content of KCl in the slurry is not less than 6%.
In order to control the solid content not to be more than 7%, the sand content is timely controlled to be less than 0.2% in the outlet sand remover so as to reduce the friction coefficient of the drilling fluid.
The six-speed rotary viscometer is adopted, and the drilling fluid cutting force is controlled to be not less than 5 and the plastic viscosity is controlled to be not less than 10 by adjusting the reading of the rotating speed dial, so that the sand carrying performance of the drilling fluid and the safety in a well are improved. And (5) finishing the drilling work of the open hole long straight section.
The drilling fluid of the embodiment ensures that the well drilling is smoothly carried out. By using the drilling fluid, no well accident caused by the drilling fluid occurs, the effect is good, the drilling speed is improved by 20%, the construction period is shortened, and the engineering cost is reduced.
Example 2
The same working thought as in example 1, in the working method, project related information including regional stratum lithology and layering, adjacent stratum pore pressure of adjacent wells, well completion report, treatment measures of drilling fluid system and performance with complex well sections, ground temperature statistics and other related data are collected in advance before drilling. The requirements for key parameter control in the geological design of the project geothermal well are familiar, and the situation that the well track is tested by wireless while-drilling equipment in the drilling process comprises a deflecting point, a deflecting rate and water level displacement information is familiar.
The open hole long straight section of the project is 100-2200m, PDC drill bit with the diameter of 215.9mm is adopted for drilling, the outer diameter of a drill rod is 127mm, the inner diameter of the drill rod is 108mm, the drilling meets the stratum to form a chalky middle-thick lamellar calcareous fine sandstone and silty mud rock interbedded, the local conglomerate and calcareous silty sandstone interbedded, the underlying mud basin is the vain conglomerate, the thick lamellar metamorphic fine sandstone in the thick lamellar silty slate clamp of the plawhile group and the like; the stratum pressure coefficient is 1.02, and a water-based drilling fluid system is adopted.
The formula of the drilling fluid comprises:
calcareous bentonite: 22kg/m 3 ；
Caustic soda 2kg/m 3 ；
Soda 1.6kg/m 3 ；
Sodium carboxymethylcellulose (CMC-Na) 2.2kg/m 3 ；
Potassium polyacrylate (K-PAM) 3.1kg/m 3 ；
Hydrolysis polyacrylonitrile compound ammonium salt (NH) 4 -HPAN）8.0kg/m 3 ；
Polyanionic cellulose (PAC) 15kg/m 3 ；
Potassium chloride (KCl) 45kg/m 3 ；
Sulfonated asphalt (SHA) 12kg/m 3 ；
Superfine calcium carbonate (Ca) 2 CO 3 ）16kg/m 3 ；
Calcium oxide 1.1kg/m 3 ；
Barite powder (BaSO) 4 ）0.08kg/m 3 ；
Anti-sticking agent (CP 233) 3.0kg/m 3 ；
2kg/m of cleaning agent 3 5kg/m of lubricant 3 Anti-collapse filtrate reducer 15kg/m 3 ；
The additional value of the drilling fluid density is 0.06g/cm 3 。
When drilling to a depth of 100m, the effective drilling fluid quantity in the well is 5m 3 The addition amount of bentonite reaches 110kg, CMC-Na11.0kg, K-PAM 15.5 kg, NH 4 40.0kg of HPAN, 10kg of caustic soda, 8kg of soda ash, 75kg of PAC, 225kg of KCl, 60kg of SHA, ca 2 CO 38 0kg of calcium oxide 6kg of BaSO 4 0.4kg,CP233 15.0kg. Testing the index Density of the main slurry to be 1.21g/cm 3 The funnel viscosity was 45. 45S, pH, the outlet temperature was 34.0 ℃, the downhole was continued, the state of the effective drilling fluid in the well was monitored in real time during the drilling process, the formulation of the newly added drilling fluid was adjusted, and the conditions and specific formulation were the same as in example 1.
In the down-drilling process, CMC-Na, K-PAM and NH are maintained according to the volume ratio 4 Size molecular polymers of HPAN are used in combination. Every 1m downwards drilling is carried out, and every 1 hour, the slurry index value is tested, and when the slurry index value is based on a normal value, 3kg PAC is added every 1m downwards drilling, so that a better mud cake can be formed, and the loss of drilling fluid is reduced.
With the increase of drilling depth, in order to prevent well collapse and reduce lost circulation and promote the capacity of drilling fluid for carrying rock cuttings, the drilling fluid density is increased by 0.05g/cm every 100 meters of drilling depth 3 By supplementing the barite powder until the density reaches 1.50g/cm 3 After that, the density was kept at 1.50g/cm 3 No longer increases; while 10kg of lubricant was added per 100 meters. The content of chloride ions and potassium ions is detected periodically every 1-2 hours, so that the content of KCl in the slurry is not less than 6%.
In order to control the solid content not to be more than 7%, the sand content is timely controlled to be less than 0.2% in the outlet sand remover so as to reduce the friction coefficient of the drilling fluid.
The six-speed rotary viscometer is adopted, and the drilling fluid cutting force is controlled to be not less than 5 and the plastic viscosity is controlled to be not less than 10 by adjusting the reading of the rotating speed dial, so that the sand carrying performance of the drilling fluid and the safety in a well are improved. And (5) finishing the drilling work of the open hole long straight section.
The drilling fluid of the embodiment ensures that the well drilling is smoothly carried out. By using the drilling fluid, no well accident caused by the drilling fluid occurs, the effect is good, the drilling speed is improved by 18.5%, compared with the embodiment 1, the drilling fluid has the advantages of 200m drilling length, similar well completion time, cost saving and construction period shortening.
Example 3
The same working thought as in example 2, the project related information is collected in advance before drilling, including the regional stratum lithology and layering, the pore pressure of adjacent stratum, the report of drilling and completion, the treatment measures of the drilling fluid system and performance with complex well sections, the ground temperature statistics and other related data. The requirements for key parameter control in the geological design of the project geothermal well are familiar, and the situation that the well track is tested by wireless while-drilling equipment in the drilling process comprises a deflecting point, a deflecting rate and water level displacement information is familiar.
The open hole long straight section of the project is 100-2200m, PDC drill bit with the diameter of 215.9mm is adopted for drilling, the outer diameter of a drill rod is 127mm, the inner diameter of the drill rod is 108mm, the drilling meets the stratum to form a chalky middle-thick lamellar calcareous fine sandstone and silty mud rock interbedded, the local conglomerate and calcareous silty sandstone interbedded, the underlying mud basin is the vain conglomerate, the thick lamellar metamorphic fine sandstone in the thick lamellar silty slate clamp of the plawhile group and the like; the stratum pressure coefficient is 1.02, and a water-based drilling fluid system is adopted.
The formula of the drilling fluid comprises:
calcareous bentonite: 28kg/m 3 ；
Caustic soda 8kg/m 3 ；
Soda 5.5kg/m 3 ；
Sodium carboxymethylcellulose (CMC-Na) 5.2kg/m 3 ；
Potassium polyacrylate (K-PAM) 6.0kg/m 3 ；
Hydrolysis polyacrylonitrile compound ammonium salt (NH) 4 -HPAN）11.5kg/m 3 ；
PolyanionCellulose (PAC) 24.5kg/m 3 ；
Potassium chloride (KCl) 70kg/m 3 ；
Sulfonated asphalt (SHA) 22kg/m 3 ；
Superfine calcium carbonate (Ca) 2 CO 3 ）26kg/m 3 ；
Calcium oxide 2.4kg/m 3 ；
Barite powder (BaSO) 4 ）0.24kg/m 3 ；
Anti-sticking agent (CP 233) 5.0kg/m 3 ；
2kg/m of cleaning agent 3 5kg/m of lubricant 3 Anti-collapse filtrate reducer 15kg/m 3 ；
The additional value of the drilling fluid density is 0.06g/cm 3 。
When drilling to a depth of 100m, the effective drilling fluid quantity in the well is 5m 3 Adding bentonite to reach 140kg, CMC-Na26kg, K-PAM 30kg and NH 4 HPAN 57.5kg, caustic soda 40kg, soda 27.5kg, PAC122.5kg, KCl350kg, SHA110kg, ca 2 CO 3 130kg, calcium oxide 12kg, baSO 4 1.2kg, CP233.25 kg. Testing main slurry index Density of 1.41g/cm 3 The funnel viscosity was 55. 55S, pH, the outlet temperature was 41.6 ℃, the downhole was continued, the state of the effective drilling fluid in the well was monitored in real time during the drilling process, the formulation of the newly added drilling fluid was adjusted, and the conditions and specific formulation were the same as in example 1.
In the down-drilling process, CMC-Na, K-PAM and NH are maintained according to the volume ratio 4 Size molecular polymers of HPAN are used in combination. Every 1m downwards drilling is carried out, and every 1 hour, the slurry index value is tested, and when the slurry index value is based on a normal value, 3.5kg PAC is added every 1m downwards drilling, so that a better mud cake can be formed, and the loss of drilling fluid is reduced.
With the increase of drilling depth, in order to prevent well collapse and reduce lost circulation and promote the capacity of drilling fluid for carrying rock cuttings, the drilling fluid density is increased by 0.05g/cm every 100 meters of drilling depth 3 By supplementing the barite powder until the density reaches 1.50g/cm 3 After that, the density was kept at 1.50g/cm 3 No longer increases; at the same time each10kg of lubricant was added 100 meters. The content of chloride ions and potassium ions is detected periodically every 1-2 hours, so that the content of KCL in the slurry is not less than 6%.
In order to control the solid content not to be more than 7%, the sand content is timely controlled to be less than 0.2% in the outlet sand remover so as to reduce the friction coefficient of the drilling fluid.
The six-speed rotary viscometer is adopted, and the drilling fluid cutting force is controlled to be not less than 5 and the plastic viscosity is controlled to be not less than 10 by adjusting the reading of the rotating speed dial, so that the sand carrying performance of the drilling fluid and the safety in a well are improved. And (5) finishing the drilling work of the open hole long straight section.
The drilling fluid of the embodiment ensures that the well drilling is smoothly carried out. By using the drilling fluid, no well accident caused by the drilling fluid occurs, the effect is good, compared with the embodiment 2, the drilling of the embodiment through a calcareous gravel stratum is thicker, about 185m, the leakage amount is larger, compared with the embodiment 2, the rate is reduced, but the drilling rate can be still improved by 12% compared with the traditional formula fluid.
Claims (10)
1. A low-density solid-phase drilling fluid for a middle-deep complex well bore is water-based, and is characterized in that the formula comprises: calcium bentonite, caustic soda, sodium carbonate, sodium carboxymethyl cellulose, potassium polyacrylate, hydrolyzed polyacrylonitrile composite ammonium salt, polyanionic cellulose, potassium chloride, sulfonated asphalt, superfine calcium carbonate, calcium oxide, barite powder, anti-sticking agent, cleaning agent and lubricant.
2. The low density solid phase drilling fluid for deep and medium complex wellbores of claim 1, wherein each 1m 3 The volume formula comprises:
calcareous bentonite: 20-28 kg;
1.5-9 kg of caustic soda;
1-6 kg of sodium carbonate;
1-6 kg of sodium carboxymethylcellulose;
3-6 kg of potassium polyacrylate;
5-12 kg of hydrolyzed polyacrylonitrile compound ammonium salt;
10-25 kg of polyanionic cellulose;
35-80 kg of potassium chloride;
10-25 kg of sulfonated asphalt;
10-28 kg of superfine calcium carbonate;
0.5-3 kg of calcium oxide;
0.06-0.3 kg of barite powder;
1.6-6 kg of anti-sticking agent;
wherein the weight ratio of the sodium carboxymethyl cellulose to the potassium polyacrylate is 0.3-0.9:1; the weight ratio of the potassium polyacrylate to the hydrolyzed polyacrylonitrile compound ammonium salt is 0.3-0.6:1; the weight ratio of the total weight of the sodium carboxymethyl cellulose and the potassium polyacrylate to the hydrolyzed polyacrylonitrile compound ammonium salt is 0.6-1:1.
3. The low density solid phase drilling fluid for deep and medium complex wellbores of claim 1 or 2, wherein the formulation of the drilling fluid is adjusted according to the effective fluid state in the well during drilling: the judging conditions are as follows:
(1) The density is less than or equal to 1.15g/cm 3 The funnel viscosity is less than or equal to 40, the S, pH value is less than or equal to 6.5, and the outlet temperature is less than or equal to 32 ℃;
(2) The density is more than 1.15 and less than or equal to 1.25g/cm 3 The viscosity of the funnel is more than 40 and less than or equal to 50S, the pH value is more than 6.5 and less than or equal to 7.2, the outlet temperature is more than 32 and less than or equal to 36 ℃;
(3) Density > 1.25g/cm 3 The funnel viscosity is more than 50, the S, pH value is more than 7.2, and the outlet temperature is more than 36 ℃;
when all or part of the conditions are met in (3), using formula C; when the unconditional meets the condition (3) and all or part of the conditions meet the condition (2), using the formula B; when all conditions are met in (1), formula A is used;
the formula A comprises:
calcareous bentonite: 21-23 kg/m 3 ；
1.9-2.3 kg/m caustic soda 3 ；
1.2-1.4 kg/m of sodium carbonate 3 ；
1.16-1.24 kg/m sodium carboxymethylcellulose 3 ；
3.3-3.7 kg/m of potassium polyacrylate 3 ；
5.6-6.4 kg/m of hydrolyzed polyacrylonitrile compound ammonium salt 3 ；
11-13 kg/m of polyanionic cellulose 3 ；
Potassium chloride 39-41 kg/m 3 ；
Sulfonated asphalt 10.4-11.6 kg/m 3 ；
11-13 kg/m of superfine calcium carbonate 3 ；
0.7-0.9 kg/m of calcium oxide 3 ；
0.06-0.07 kg/m of barite powder 3 ；
Anti-seize agent 1.7-2.5 kg/m 3 ；
The formula B comprises:
calcareous bentonite: 23-25 kg/m 3 ；
Caustic soda 2.3-2.7 kg/m 3 ；
1.7-1.9 kg/m of sodium carbonate 3 ；
1.96-2.04 kg/m of sodium carboxymethyl cellulose 3 ；
3.3-3.7 kg/m of potassium polyacrylate 3 ；
Hydrolyzed polyacrylonitrile compound ammonium salt 7.6-8.4 kg/m 3 ；
Polyanionic cellulose 14-16 kg/m 3 ；
41-43 kg/m of potassium chloride 3 ；
12.4-13.6 kg/m sulfonated asphalt 3 ；
Superfine calcium carbonate 15-17 kg/m 3 ；
0.9-1.1 kg/m of calcium oxide 3 ；
Barite powder 0.065-0.075 kg/m 3 ；
Anti-sticking agent 2.2-3 kg/m 3 ；
The formula C comprises:
calcareous bentonite: 24-26 kg/m 3 ；
Caustic soda 2.8-3.2 kg/m 3 ；
1.9-2.1 kg/m of sodium carbonate 3 ；
Sodium carboxymethylcellulose 2.46-2.54 kg/m 3 ；
Potassium polyacrylate 3.6-4 kg/m 3 ；
Hydrolytic polypropylene8.1-8.9 kg/m of dinitrile compound ammonium salt 3 ；
19-21 kg/m of polyanionic cellulose 3 ；
49-51 kg/m of potassium chloride 3 ；
14.4-15.6 kg/m sulfonated asphalt 3 ；
Superfine calcium carbonate 19-21 kg/m 3 ；
1.5-1.7 kg/m of calcium oxide 3 ；
0.105-0.115 kg/m of barite powder 3 ；
3.1-3.9 kg/m of anti-sticking agent 3 。
4. The low density solid phase drilling fluid for deep and medium complex wellbores of any one of claims 1-3, wherein the formulation of the drilling fluid further comprises: cleaning agent 2-3 kg/m 3 Lubricant 5-10 kg/m 3 Anti-collapse filtrate reducer 15-20 kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The additional value of the drilling fluid density is 0.05-0.10g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The anti-sticking agent is CP233 anti-sticking agent.
5. The use of a low density solid phase drilling fluid for deep and medium complex wellbores according to any one of claims 1 to 4, wherein 2.5 to 4kg of polyanionic cellulose is added to the drilling fluid after drilling to a depth of 100m for each 1m of drilling; every 100 meters of drilling depth is increased, the drilling fluid density is increased by 0.04-0.06 g/cm 3 Until the density of the drilling fluid reaches 1.45-1.55 g/cm 3 。
6. The use of a low density solid phase drilling fluid for deep and medium complex wellbores of claim 5, wherein increasing the drilling fluid density is achieved by supplemental addition of barite powder.
7. The use of a low density solid phase drilling fluid for deep and medium complex wellbores according to any one of claims 1 to 6, wherein 8 to 15kg of lubricant is added to the drilling fluid for every 100 meters of drilling depth.
8. The use of a low density solid phase drilling fluid for deep and medium complex wellbores according to any one of claims 1 to 7, wherein KCl is supplemented when the KCl content in the well effective drilling fluid is below 6%.
9. The use of a low density solid phase drilling fluid for deep and medium complex wellbores as claimed in any one of claims 1 to 8, wherein the sand content of the well effective drilling fluid is controlled to be less than 0.2% by sand removal means.
10. The use of a low density solid phase drilling fluid for deep and medium complex wellbores according to any one of claims 1 to 9, wherein the dynamic shear force of the effective drilling fluid in the well is controlled to be not less than 5 and the plastic viscosity is controlled to be not less than 10.
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| CN202310900007.8A CN116925714A (en) | 2023-07-21 | 2023-07-21 | Low-density solid-phase drilling fluid for middle-deep complex well bore and application thereof |
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