CN116064002A - Bicontinuous drilling fluid system, preparation method and evaluation method - Google Patents
Bicontinuous drilling fluid system, preparation method and evaluation method Download PDFInfo
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- 239000012530 fluid Substances 0.000 title claims abstract description 226
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- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 1
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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
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
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Abstract
The invention provides a drilling fluid system with water phase and oil phase both being continuous phases, which realizes respective continuity of the oil-based system and the water-based system in a blending system by optimizing components and addition of the water-based system and the oil-based system, and simultaneously establishes a method for evaluating the bicontinuous phase drilling fluid system by conductivity. The drilling fluid system can exert the advantages of strong rock carrying capacity of the water-based drilling fluid, strong inhibition and lubrication capacity of the oil-based drilling fluid and long well wall stabilization period, and achieves the purposes of safe and quick drilling.
Description
Technical Field
The invention relates to the technical field of oilfield drilling fluid, in particular to a bicontinuous phase drilling fluid system, a preparation method and an evaluation method.
Background
Water-based drilling fluids and oil-based drilling fluids are currently the two most commonly used drilling fluid systems in petroleum exploration and development processes. In comparison, both drilling fluid systems have respective advantages and disadvantages.
The water-base drilling fluid is composed of bentonite, filtrate reducer, sulfonated heat-resisting material, collapse-preventing material, lubricant, pH regulator and weighting agent. Compared with oil-based drilling fluid, the water-based system has the advantages of higher shear force, stronger rock carrying capacity and relatively lower cost, but the hydration of filtrate to minerals is easy to cause necking or stratum collapse when drilling complex stratum with strong water sensitivity, fragility and the like, the stratum collapse period is short, and the underground safety risk is high.
The oil-based drilling fluid is a water-in-oil system taking oil as a continuous phase, and is composed of organic soil, an emulsifying agent, a filtrate reducer, a flow pattern regulator, calcium chloride, calcium oxide and other treatment agents, and the oil-based system has good lubricating property by forming an oil film on the surface of a stratum, so that the water-based drilling fluid can resist hydration expansion of water-phase filtrate on easily-hydrated minerals of a complex stratum, is beneficial to improving the stability of a well wall and prolonging the safety period of a well bore, but has the defects of troublesome later well cementation treatment, environmental protection, low cost and the like.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a bicontinuous phase drilling fluid system with a continuous phase water phase and an oil phase, and the bicontinuous phase drilling fluid system is beneficial to exerting the advantages of strong rock carrying capacity of water-based drilling fluid, hydration inhibition of oil-based drilling fluid and well wall stability. In addition, the bicontinuous drilling fluid system has the advantages of both water-based drilling fluid and oil-based drilling fluid, and has the capacities of carrying rock, lubricating, blocking, preventing collapse, inhibiting hydration and dispersion of clay and the like, so that the aims of reducing underground safety risk and improving drilling efficiency are fulfilled. Further, the invention also provides a preparation method and an evaluation method of the bicontinuous drilling fluid system.
In a first aspect, the present invention provides a bicontinuous phase drilling fluid system, wherein both the water-based drilling fluid and the oil-based drilling fluid are continuous phase drilling fluid systems;
the water phase drilling fluid comprises bentonite, a pH regulator, a clay stabilizer, a water-based fluid loss additive, a plugging anti-collapse agent, a weighting agent, a demulsifier and water;
the oil-based drilling fluid comprises organic soil, an oil-based filtrate reducer, a wetting agent, a weighting agent and base oil;
the volume ratio of the water-based drilling fluid to the oil-based drilling fluid is 30:70-70:30.
Preferably, the volume ratio of the water-based drilling fluid to the oil-based drilling fluid is 35:65-65:35;
more preferably, the volume ratio of the water-based drilling fluid to the oil-based drilling fluid is 40:60 to 60:40.
As a specific embodiment of the invention, the water-based drilling fluid comprises the following components in parts by weight:
100 parts of water, and the water content is equal to 100 parts,
0.1-15 parts of bentonite,
0.02-0.3 part of pH regulator,
0.05 to 0.3 portion of clay stabilizer,
0.5-4.0 parts of water-based filtrate reducer,
0.5 to 4.0 portions of plugging anti-collapse agent,
1-55 parts of a first weighting agent,
0.1-3.0 parts of demulsifier.
As a specific embodiment of the invention, the water-based drilling fluid comprises the following components in parts by weight: 100 parts of water, and the water content is equal to 100 parts,
0.5 to 10.0 parts of bentonite,
0.03-0.2 part of pH regulator,
0.06-0.3 part of clay stabilizer,
1.0 to 3.0 parts of water-based filtrate reducer,
1.0 to 3.5 portions of plugging anti-collapse agent,
2-50 parts of a first weighting agent,
and 0.3-2.5 parts of demulsifier.
As a specific embodiment of the invention, the water-based drilling fluid comprises the following components in parts by weight: 100 parts of water, and the water content is equal to 100 parts,
0.5 to 8.0 portions of bentonite,
0.05 to 0.2 part of pH regulator,
0.1 to 0.25 portion of clay stabilizer,
1.0 to 2.5 parts of water-based filtrate reducer,
1.5 to 3.0 portions of plugging anti-collapse agent,
5 to 45 parts of a first weighting agent,
0.5 to 2.0 portions of demulsifier.
As a specific embodiment of the invention, the oil-based drilling fluid comprises the following components in parts by weight:
100 parts of base oil, namely, a mixture of two or more of the following components,
0.1-10 parts of organic soil,
0.5 to 6.0 parts of oil-based filtrate reducer,
0.1-5 parts of wetting agent,
10-80 parts of a second weighting agent.
As a specific embodiment of the invention, the oil-based drilling fluid comprises the following components in parts by weight:
100 parts of base oil, namely, a mixture of two or more of the following components,
0.5 to 8.0 portions of organic soil,
1.0 to 5.0 parts of oil-based filtrate reducer,
0.5-4 parts of wetting agent,
20-75 parts of a second weighting agent.
As a specific embodiment of the invention, the oil-based drilling fluid comprises the following components in parts by weight:
100 parts of base oil, namely, a mixture of two or more of the following components,
0.5 to 6.0 portions of organic soil,
2.0 to 4.5 parts of oil-based filtrate reducer,
0.8 to 3.0 portions of wetting agent,
30-70 parts of a second weighting agent.
As a specific embodiment of the present invention, the bentonite is one or more of sodium bentonite, calcium bentonite, lithium bentonite and calcium sodium bentonite.
As a specific embodiment of the present invention, the pH adjustor is NaOH, KOH, ca (OH) 2 One or more of LiOH.
As a specific embodiment of the present invention, the pH adjuster functions to maintain a pH of 9.5-13.0 for the water-based drilling fluid.
As a specific embodiment of the present invention, the clay stabilizer is Na 2 CO 3 、K 2 CO 3 、NaHCO 3 、KHCO 3 One or more of the following.
As a specific embodiment of the present invention, the water-based fluid loss additive includes natural biological fluid loss additives and/or synthetic high molecular polymers.
As a specific embodiment of the present invention, the natural biological fluid loss agent may be polyanionic cellulose, carboxymethyl and/or hydroxyethyl cellulose sodium/potassium salt. The synthetic high molecular polymer can be polyacrylamide or polyacrylamide potassium salt.
As a specific embodiment of the invention, the plugging and anti-collapse agent is one or more of emulsified asphalt, sulfonated asphalt and cationic asphalt powder.
As a specific embodiment of the present invention, the first weighting agent is one or more of heavy rock, micro manganese and limestone.
In the invention, the particle size of the first weighting agent can be distributed in multiple stages, and the particle size distribution range is preferably 10 nm-500 um, so that the dual functions of weighting and plugging microcracks can be achieved.
As specific embodiments of the invention, the demulsifier is one or more of random polyether and polyethylene polyamine demulsifier.
As a specific embodiment of the invention, the random polyether can be one or more of isomeric dodecanol random polyether, propylene glycol random polyether and glycerol random polyether.
In the present invention, the molar ratio of oxyethyl EO to oxypropyl PO in the polyether ranges from m (EO)/m (PO) =1:8 to 1:2, preferably from 1:6 to 1:2.5, more preferably from 1:5 to 1:2.5.
As a specific embodiment of the present invention, the polyethylene polyamine may be one or more of triethylene tetramine polyether, tetraethylene pentamine polyether, and polyethylene polyamine silicone.
As a specific embodiment of the present invention, the base oil is one or more of vegetable oil or mineral oil.
Wherein, the vegetable oil is preferably cotton seed oil or biodiesel; the mineral oil is preferably diesel oil, white oil, alpha-olefins, linear paraffins, saturated or unsaturated polyalphaolefins.
As a specific embodiment of the invention, the organic soil is quaternary ammonium salt with chain length of C8-C14 and organic amine modified sodium bentonite.
As a specific embodiment of the invention, the oil-based filtrate reducer is one or more of colloid, asphaltene, oxidized asphalt and organic amine modified humic acid.
As a specific embodiment of the invention, the wetting agent is one or more of vegetable oil fatty acid and vegetable oil fatty acid ester; among them, one or more of castor oil fatty acid and/or ester, rapeseed oil fatty acid and/or ester, linseed oil fatty acid and/or ester, cottonseed oil fatty acid and/or ester are preferable.
As a specific embodiment of the present invention, the second weighting agent is one or more of barite and limestone. Wherein, the particle size is required to be distributed in multiple stages, the particle size distribution range is 10 nm-500 um, and the dual functions of aggravating and plugging microcracks are achieved.
The above-mentioned raw materials in the present invention are all self-made or commercially available, and the present invention is not particularly limited thereto.
In a second aspect, the present invention provides a method for preparing a bicontinuous phase drilling fluid system, wherein a water-based drilling fluid is mixed with an oil-based drilling fluid in proportion under stirring, preferably at a speed of 50-500rpm, to obtain a bicontinuous phase drilling fluid system.
As a specific embodiment of the present invention, mixing the water-based drilling fluid with the oil-based drilling fluid includes pouring the oil-based drilling fluid into the water-based drilling fluid, or pouring the water-based drilling fluid into the oil-based drilling fluid, the water-based and oil-based drilling fluids being miscible with each other.
It should be noted that, in order to achieve mutual continuous dependence in the longitudinal direction after the water-based and oil-based drilling fluids are compounded, the density values of the water-based and oil-based should be similar, preferably, the density difference between the two before compounding should be not more than 0.02g/cm 3 。
As a specific embodiment of the invention, the water-based drilling fluid preparation method comprises the following steps:
s101: adding a pH regulator and a clay stabilizer into water under stirring at normal temperature, and stirring (for example, 1-10 minutes) for dissolution;
s102: adding bentonite into the solution obtained in the step S101, stirring for 2-3 hours, and then sealing and standing for 24-48 hours;
s103: and (3) adding the water-based filtrate reducer, the plugging anti-collapse agent, the first weighting agent and the demulsifier into the material obtained in the step (S102) under the stirring condition, and stirring to obtain the water-based drilling fluid.
As a specific embodiment of the present invention, the oil-based drilling fluid preparation method includes the steps of:
s201: adding a wetting agent into the base oil under stirring at normal temperature, and stirring (for example, 1-10 minutes) for dissolution;
s202: adding organic soil into the solution obtained in the step S201, stirring for 2-3 hours, and then sealing and standing for 12-24 hours;
s203: and adding the oil-based filtrate reducer and the second weighting agent into the material obtained in the step 202 under the stirring condition, and stirring to obtain the oil-based drilling fluid.
As a specific embodiment of the invention, the density of the bicontinuous drilling fluid system is 1.00-1.30g/cm 3 8-20Pa of dynamic cutting force, 4-10/7-15 of initial/final cutting force, 0.4-0.8 of dynamic-plastic ratio and less than 0.1 of extreme pressure lubrication coefficient.
In a third aspect, the invention provides a method for evaluating a bicontinuous drilling fluid system, characterized by characterizing the presence of the bicontinuous drilling fluid system by conductivity testing.
As a specific embodiment of the invention, the conductivities of the water-based drilling fluid and the oil-based drilling fluid are tested firstly, then the conductivity test value of the bicontinuous phase drilling fluid is tested continuously, the bicontinuous phase drilling fluid is changed along with time to be in a zigzag shape or a wave shape, and the conductivity value of the bicontinuous phase drilling fluid is not higher than the conductivity of the water-based drilling fluid, namely the bicontinuous phase drilling fluid system is prepared.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the bicontinuous drilling fluid system provided by the invention, the water-based drilling fluid takes water as a continuous phase, the oil-based drilling fluid takes oil as a continuous phase, the water-based drilling fluid and the oil-based drilling fluid are mixed in proportion to obtain the bicontinuous drilling fluid system, and the drilling fluid system integrating the advantages of the water-based drilling fluid and the oil-based drilling fluid is obtained by adjusting the properties of the respective continuous phases and through the interaction between the treatment agents, wherein the oil-based drilling fluid coats an oil film around a well wall, so that the well wall instability caused by hydration stress after the water-based drilling fluid is lost is reduced, and meanwhile, the relatively high viscosity-shear effect of the water-based drilling fluid is ensured, so that the purpose of safe and rapid drilling is realized.
2. The density of the bicontinuous phase drilling fluid system obtained by the embodiment of the invention is 1.0-1.3 g/cm 3 The dynamic cutting force is 8-20Pa, the primary/final cutting force is 4-10/7-15Pa, the dynamic plastic ratio is 0.4-0.8, the extreme pressure lubrication coefficient is less than 0.1, the temperature resistance is 130 ℃, and the requirement of rapid drilling within the formation temperature of 130 ℃ can be met. The rheological property and the change rule of the conductivity of the system are obviously changed beyond 130 ℃, and the change is particularly characterized in that thickening and flow pattern deterioration occur after stirring, and the change of the conductivity is slowed down with time.
3. The preparation method of the double continuous phase drilling fluid system provided by the invention does not need precise instruments and equipment, is simple and easy to operate, has low cost and good economy, is used along with preparation, and is suitable for drilling working conditions.
4. The evaluation method of the bicontinuous phase drilling fluid system, which is provided by the invention, is characterized by the existence of the bicontinuous phase drilling fluid system through a conductivity test method, and has the advantages of simplicity, strong operability and convenience in test during working conditions.
Drawings
FIG. 1 is a graph of conductivity of the bicontinuous drilling fluid system obtained in example 1 over time;
FIG. 2 is a graph of conductivity of the bicontinuous drilling fluid system obtained in example 2 over time;
FIG. 3 is a graph of conductivity versus time for the bicontinuous drilling fluid system obtained in example 3.
Detailed Description
The invention is further illustrated below in connection with specific examples, which are not to be construed as limiting the invention in any way.
The water-based drilling fluid, the oil-based drilling fluid and the bicontinuous phase drilling fluid system obtained in each embodiment of the invention evaluate the comprehensive performance of the drilling fluid according to SY/T5621-1993 drilling fluid test procedure.
The rock carrying capacity of the system is considered to be stronger as the dynamic shear force and the dynamic plastic ratio are larger under the same displacement condition; the linear expansion rate can indirectly represent the stress change of the stratum after the drilling fluid permeates into the mudstone stratum, and the smaller the relative expansion rate of the mudstone is, the smaller the hydration stress of the stratum is; the drilling speed is closely related to the drilling fluid, namely the rock carrying capacity and the solid phase content, the rock carrying capacity is strong, drill cuttings can be returned in time, repeated grinding of the drill cuttings at the bottom of a well is avoided, and the drilling speed is improved; meanwhile, under the condition of ensuring enough shear force and dynamic plastic ratio, the relatively lower solid phase content can also help to improve the mechanical drilling speed.
Example 1
The embodiment provides a bicontinuous phase drilling fluid system and a preparation method thereof, and the specific details are as follows:
the components and the contents of the water-based drilling fluid, the oil-based drilling fluid and the bicontinuous phase drilling fluid system are as follows:
the water-based drilling fluid comprises the following components in parts by mass:
sodium bentonite 0.6 part, naOH 0.06 part, na 2 CO 3 0.1 part of low-viscosity hydroxyethyl cellulose (1% aqueous solution with the normal temperature AV value less than or equal to 10mPa.s and the substitution degree of 1.8-3.0) 1.0 part, and emulsified asphalt (carbon chain C 8 ～C 22 Aryl or cycloalkyl quaternary ammonium salt) 1.5 parts, barite 6 parts, glycerol random polyether (molecular weight 2500-5500dal, molar ratio of oxyethyl EO to oxypropyl PO m (EO)/m (PO) =1:3) 0.7 parts, water 100 parts.
The oil-based drilling fluid comprises the following components in parts by mass:
organic soil (carbon chain C) 8 -C 14 Kneading and modifying quaternary ammonium salt of (2) 0.8 parts, asphalt oxide 2.0 parts, rapeseed oil fatty acid ester 0.9 parts, barite 32 parts and diesel oil 100 parts.
The preparation method of the water-based drilling fluid in the embodiment comprises the following components in parts by mass:
to 100 parts of water were added 0.06 part of NaOH and 0.1 part of Na 2 CO 3 0.6 part of sodium bentonite, uniformly stirring, standing and hydrating for 24 hours, sequentially adding 1.0 part of low-viscosity hydroxyethyl cellulose, 1.5 parts of emulsified asphalt, 6 parts of barite and 0.7 part of glycerol random polyether, and uniformly stirring at a low speed to obtain the density of 1.09g/cm 3 Is a water-based drilling fluid.
The oil-based drilling fluid in this embodiment is prepared by the following method:
adding 0.9 part of rapeseed oil fatty acid ester and 0.8 part of organic soil into 100 parts of diesel oil, uniformly stirring, standing and hydrating for 24 hours, sequentially adding 2.0 parts of oxidized asphalt and 32 parts of barite, and uniformly stirring at a low speed to obtain the density of 1.08g/cm 3 Is an oil-based drilling fluid.
The preparation method of the bicontinuous phase drilling fluid in the embodiment comprises the following steps:
slowly pouring the obtained water-based drilling fluid into the stirred oil-based drilling fluid, stirring for 1-3min at the speed of 100rpm, and standing for 5-10 min to obtain the bicontinuous phase drilling fluid, wherein the volume ratio of the water-based drilling fluid to the oil-based drilling fluid is 40:60.
The water-based drilling fluid, oil-based drilling fluid and bicontinuous phase drilling fluid system obtained in example 1 were evaluated for comprehensive properties according to SY/T5621-1993 drilling fluid test procedure, and the results are shown in Table 1.
Table 1 properties of drilling fluids obtained in example 1
The water-based drilling fluid, the oil-based drilling fluid and the bicontinuous phase drilling fluid system obtained in the example 1 are respectively tested in conductivity, as shown in fig. 1, the conductivity value of the bicontinuous phase drilling fluid is in a zigzag shape along with the time change, and the conductivity value of the bicontinuous phase drilling fluid is not higher than the conductivity of the water-based drilling fluid, which indicates that the bicontinuous phase drilling fluid system prepared in the example 1 can be used for practical production.
Example 2
The embodiment provides a bicontinuous phase drilling fluid system and a preparation method thereof, and the specific details are as follows:
the components and the contents of the water-based drilling fluid, the oil-based drilling fluid and the bicontinuous phase drilling fluid system are as follows:
the water-based drilling fluid comprises the following components in parts by mass:
3.0 parts of sodium bentonite, 0.12 part of NaOH and Na 2 CO 3 0.17 part of low-viscosity sodium carboxymethyl cellulose (1% aqueous solution with the normal temperature AV value less than or equal to 30mPa.s, the substitution degree of 1.5-2.5), 2.1 parts of sulfonated asphalt (sodium sulfonate content more than or equal to 10%), 25 parts of barite, 1.2 parts of heterogeneous dodecanol random polyether (molecular weight of 1000-2500dal, mol ratio of oxyethyl EO and oxypropyl PO of m (EO)/m (PO) =1:3.5) and 100 parts of water.
The oil-based drilling fluid comprises the following components in parts by mass:
organic soil (carbon chain C) 8 -C 14 Kneading and modifying quaternary ammonium salt of (2) 3.0 parts, asphaltene 3.2 parts, castor oil fatty acid ester 1.9 parts, barite 32 parts, and 5# white oil 100 parts.
The preparation method of the water-based drilling fluid in the embodiment comprises the following components in parts by mass:
to 100 parts of water were added 0.12 part NaOH, 0.17 part Na 2 CO 3 3.0 parts of sodium bentonite, uniformly stirring, standing and hydrating for 36 hours, sequentially adding 1.5 parts of low-viscosity sodium carboxymethyl cellulose, 2.1 parts of sulfonated asphalt, 25 parts of barite and 1.2 parts of heterogeneous dodecanol random polyether, and uniformly stirring at a low speed to obtain the density of 1.20g/cm 3 Is a water-based drilling fluid.
The oil-based drilling fluid in this embodiment is prepared by the following method:
adding 1.9 parts of castor oil fatty acid ester and 0.8 part of organic soil into 100 parts of No. 5 white oil, uniformly stirring, standing and hydrating for 20 hours, sequentially adding 3.2 parts of asphaltene and 32 parts of barite, and uniformly stirring at a low speed to obtain the density of 1.19g/cm 3 Is an oil-based drilling fluid.
The preparation method of the bicontinuous phase drilling fluid in the embodiment comprises the following steps:
slowly pouring the obtained water-based drilling fluid into the stirred oil-based drilling fluid, stirring at 300rpm for 1-3min, and standing for 5-10 min to obtain the bicontinuous phase drilling fluid, wherein the volume ratio of the water-based drilling fluid to the oil-based drilling fluid is 45:55.
The water-based drilling fluid, oil-based drilling fluid and bicontinuous phase drilling fluid system obtained in example 2 were evaluated for comprehensive properties according to SY/T5621-1993 drilling fluid test procedure, and the results are shown in Table 2.
Table 2 example 2 drilling fluid properties
The water-based drilling fluid, the oil-based drilling fluid and the bicontinuous phase drilling fluid system obtained in the example 2 are respectively tested for conductivity, as shown in fig. 2, the conductivity value of the bicontinuous phase drilling fluid is in a zigzag shape along with the time change, and the conductivity value of the bicontinuous phase drilling fluid is not higher than the conductivity of the water-based drilling fluid, which indicates that the bicontinuous phase drilling fluid system prepared in the example 2 can be used for practical production.
Example 3
The embodiment provides a bicontinuous phase drilling fluid system and a preparation method thereof, and the specific details are as follows:
the components and the contents of the water-based drilling fluid, the oil-based drilling fluid and the bicontinuous phase drilling fluid system are as follows:
the water-based drilling fluid comprises the following components in parts by mass:
6.5 parts of calcium sodium bentonite, 0.16 part of NaOH and Na 2 CO 3 0.22 part of hydroxyethyl cellulose sodium (1% aqueous solution with the normal temperature AV value less than or equal to 30mPa.s, the substitution degree of 1.5-2.7), 0.1 part of polyacrylamide (with the molecular weight of 6000-150000 dal.) and 2.6 parts of cationic asphalt powder, 41 parts of barite, propylene glycol random polyether (with the molecular weight of 1000-15000 dal.) and 0.7 part of water, wherein the mol ratio of the oxyethyl EO and the oxypropyl PO is m (EO)/m (PO) =1:4.5.
The oil-based drilling fluid comprises the following components in parts by mass:
C 8 -C 14 5.5 parts of organic amine modified sodium bentonite, 4.2 parts of asphaltene, 2.4 parts of flaxseed fatty acid ester, 66 parts of barite and C carbon chain 12 -C 16 100 parts of linear paraffin.
The preparation method of the water-based drilling fluid in the embodiment comprises the following components in parts by mass:
to 100 parts of water were added 0.16 part NaOH, 0.22 part Na 2 CO 3 6.5 parts of calcium-based sodium bentonite, uniformly stirring, standing and hydrating for 24 hours, sequentially adding 0.8 part of hydroxyethyl cellulose sodium, 0.1 part of polyacrylamide, 2.6 parts of cationic asphalt powder, 41 parts of barite and 0.7 part of propylene glycol random polyether, and uniformly stirring at a low speed to obtain the density of 1.30g/cm 3 Is a water-based drilling fluid.
The oil-based drilling fluid in this embodiment is prepared by the following method:
adding 2.4 parts of flaxseed fatty acid ester and 55 parts of organic amine modified sodium bentonite into 100 parts of linear paraffin, uniformly stirring, standing and hydrating for 24 hours, sequentially adding 1.2 parts of asphaltene and 66 parts of barite, and uniformly stirring at a low speed to obtain the density of 1.30g/cm 3 Is an oil-based drilling fluid.
The preparation method of the bicontinuous phase drilling fluid in the embodiment comprises the following steps:
slowly pouring the obtained water-based drilling fluid into the stirred oil-based drilling fluid, stirring at 400rpm for 1-3min, and standing for 5-10 min to obtain the bicontinuous phase drilling fluid, wherein the volume ratio of the water-based drilling fluid to the oil-based drilling fluid is 50:50.
The water-based drilling fluid, oil-based drilling fluid and bicontinuous phase drilling fluid system obtained in example 3 were evaluated for comprehensive properties according to SY/T5621-1993 drilling fluid test procedure, and the results are shown in Table 3.
Table 3 example 3 drilling fluid properties
The water-based drilling fluid, the oil-based drilling fluid and the bicontinuous phase drilling fluid system obtained in the example 3 are respectively tested for conductivity, as shown in fig. 3, the conductivity value of the bicontinuous phase drilling fluid is in a zigzag shape along with the time change, and the conductivity value of the bicontinuous phase drilling fluid is not higher than the conductivity of the water-based drilling fluid, which indicates that the bicontinuous phase drilling fluid system prepared in the example 3 can be used for practical production.
The density of the bicontinuous phase drilling fluid obtained in the embodiments 1 to 3 of the invention is 1.08 to 1.30g/cm 3 The primary/final cutting force is 4-7 Pa/7-13 Pa, the dynamic plastic ratio is 0.47-0.66, the dynamic cutting force and the dynamic plastic ratio can represent the rock carrying capacity, and under the same displacement condition, the larger the dynamic cutting force and the dynamic plastic ratio, the stronger the rock carrying capacity of the system is considered, so that the rock carrying capacity of the bicontinuous phase drilling fluid obtained by the embodiment of the invention is similar to the rock carrying capacity of the water-based drilling fluid.
Compared with water-based, oil-based and bicontinuous systems, the oil-based drilling fluid has the advantages that the relative expansion rate of the mudstone is minimum, the hydration stress is also minimum, the oil-based system is soaked in the oil-based system to be the most stable, but the oil-based system has the problem that the lithology carrying performance is much worse than that of the water-based system, the bicontinuous system just overcomes the defect of the oil-based system, and simultaneously, the advantage of keeping the oil-based as much as possible is realized, namely the oil-based drilling fluid has lower mudstone expansion rate.
The drilling speed is closely related to the drilling fluid, namely the rock carrying capacity and the solid phase content, the rock carrying capacity is strong, drill cuttings can be returned in time, repeated grinding of the drill cuttings at the bottom of a well is avoided, and the drilling speed is improved; meanwhile, under the condition of ensuring enough shear force and dynamic plastic ratio, relatively lower solid content can also help to improve the mechanical drilling speed, and the bicontinuous phase system has good dynamic shear force and dynamic plastic ratio, and does not need to ensure the shear force and dynamic plastic ratio by increasing the bentonite content like a water-based system, so that the bicontinuous phase can keep relatively lower solid content.
In conclusion, the bicontinuous phase drilling fluid system provided by the invention can fully play the advantages of strong rock carrying capacity of the water-based drilling fluid, strong inhibition and lubrication capacity of the oil-based drilling fluid and long well wall stability period, and achieves the purposes of safe and rapid drilling. The preparation method of the double continuous phase drilling fluid system is simple, efficient, good in economical efficiency and simple and convenient in evaluation method, and provides a guarantee for accelerating drilling production.
Any numerical value recited in this disclosure includes all values incremented by one unit from the lowest value to the highest value if there is only a two unit interval between any lowest value and any highest value. For example, if the amount of one component, or the value of a process variable such as temperature, pressure, time, etc., is stated to be 50-90, it is meant in this specification that values such as 51-89, 52-88 … …, and 69-71, and 70-71 are specifically recited. For non-integer values, 0.1, 0.01, 0.001 or 0.0001 units may be considered as appropriate. This is only a few examples of the specific designations. In a similar manner, all possible combinations of numerical values between the lowest value and the highest value enumerated are to be considered to be disclosed in this application.
It should be noted that the above-described embodiments are only for explaining the present invention and do not constitute any limitation of the present invention. The invention has been described with reference to exemplary embodiments, but it is understood that the words which have been used are words of description and illustration, rather than words of limitation. Modifications may be made to the invention as defined in the appended claims, and the invention may be modified without departing from the scope and spirit of the invention. Although the invention is described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein, as the invention extends to all other means and applications which perform the same function.
Claims (10)
1. The bicontinuous drilling fluid system is characterized by comprising a water-based drilling fluid and an oil-based drilling fluid, wherein the water-based drilling fluid and the oil-based drilling fluid are continuous phases;
the water phase drilling fluid comprises bentonite, a pH regulator, a clay stabilizer, a water-based filtrate reducer, a plugging anti-collapse agent, a first weighting agent, a demulsifier and water;
the oil-based drilling fluid comprises organic soil, an oil-based filtrate reducer, a wetting agent, a second weighting agent and base oil;
the volume ratio of the water-based drilling fluid to the oil-based drilling fluid is 30:70-70:30;
preferably, the volume ratio of the water-based drilling fluid to the oil-based drilling fluid is 35:65-65:35;
more preferably, the volume ratio of the water-based drilling fluid to the oil-based drilling fluid is 40:60 to 60:40.
2. The drilling fluid system of claim 1, wherein the water-based drilling fluid comprises, in parts by weight:
100 parts of water, and the water content is equal to 100 parts,
0.1-15 parts of bentonite,
0.02-0.3 part of pH regulator,
0.05 to 0.3 portion of clay stabilizer,
0.5-4.0 parts of water-based filtrate reducer,
0.5 to 4.0 portions of plugging anti-collapse agent,
1-55 parts of a first weighting agent,
0.1-3.0 parts of demulsifier.
3. The drilling fluid system of claim 1, wherein the water-based drilling fluid comprises, in parts by weight:
100 parts of water, and the water content is equal to 100 parts,
0.5 to 10.0 parts of bentonite,
0.03-0.2 part of pH regulator,
0.06-0.3 part of clay stabilizer,
1.0 to 3.0 parts of water-based filtrate reducer,
1.0 to 3.5 portions of plugging anti-collapse agent,
2-50 parts of a first weighting agent,
and 0.3-2.5 parts of demulsifier.
4. The drilling fluid system of claim 1, wherein the water-based drilling fluid comprises, in parts by weight, more preferably,
100 parts of water, and the water content is equal to 100 parts,
0.5 to 8.0 portions of bentonite,
0.05 to 0.2 part of pH regulator,
0.1 to 0.25 portion of clay stabilizer,
1.0 to 2.5 parts of water-based filtrate reducer,
1.5 to 3.0 portions of plugging anti-collapse agent,
5 to 45 parts of a first weighting agent,
0.5 to 2.0 portions of demulsifier.
5. The drilling fluid system of any one of claims 1-4, wherein the oil-based drilling fluid comprises, in parts by weight:
100 parts of base oil, namely, a mixture of two or more of the following components,
0.1-10 parts of organic soil,
0.5 to 6.0 parts of oil-based filtrate reducer,
0.1-5 parts of wetting agent,
10-80 parts of a second weighting agent.
6. The drilling fluid system of any one of claim 1 to 4, wherein the oil-based drilling fluid comprises, in parts by weight,
100 parts of base oil, namely, a mixture of two or more of the following components,
0.5 to 8.0 portions of organic soil,
1.0 to 5.0 parts of oil-based filtrate reducer,
0.5-4 parts of wetting agent,
20-75 parts of a second weighting agent.
7. The drilling fluid system of any one of claim 1 to 4, wherein the oil-based drilling fluid comprises, in parts by weight,
100 parts of base oil, namely, a mixture of two or more of the following components,
0.5 to 6.0 portions of organic soil,
2.0 to 4.5 parts of oil-based filtrate reducer,
0.8 to 3.0 portions of wetting agent,
30-70 parts of a second weighting agent.
8. The drilling fluid system of any one of claim 1 to 7,
the bentonite is one or more of sodium bentonite, calcium bentonite, lithium bentonite and calcium sodium bentonite; and/or
The pH regulator is NaOH, KOH, ca (OH) 2 One or more of LiOH; and/or
The clay stabilizer is Na 2 CO 3 、K 2 CO 3 、NaHCO 3 、KHCO 3 One or more of the following; and/or
The water-based filtrate reducer comprises a natural biological filtrate reducer and/or a synthetic high molecular polymer; and/or
The plugging anti-collapse agent is one or more of emulsified asphalt, sulfonated asphalt and cationic asphalt powder; and/or
The first weighting agent is one or more of heavy rock, micro manganese and limestone; and/or
The demulsifier is one or more of random polyether and polyethylene polyamine demulsifier; and/or
The base oil is one or more of vegetable oil or mineral oil; and/or
The organic soil is quaternary ammonium salt with chain length of C8-C14 and/or organic amine modified sodium bentonite; and/or
The oil-based filtrate reducer is one or more of colloid, asphaltene, oxidized asphalt and organic amine modified humic acid; and/or
The wetting agent is one or more of vegetable oil fatty acid and vegetable oil fatty acid ester; and/or
The second weighting agent is one or more of heavy rock and limestone.
9. A method for preparing a bicontinuous phase drilling fluid system according to any one of claims 1-8, characterized in that the water-based drilling fluid and the oil-based drilling fluid are mixed in proportion under stirring, and stirring is carried out to obtain the bicontinuous phase drilling fluid system;
preferably, the water-based drilling fluid preparation method comprises the following steps:
s101: adding a pH regulator and a clay stabilizer into water under a normal-temperature stirring state, and stirring and dissolving;
s102: adding bentonite into the solution obtained in the step S101, stirring for 2-3 hours, and then sealing and standing for 24-48 hours;
s103: under the stirring condition, adding a water-based filtrate reducer, a plugging anti-collapse agent, a first weighting agent and a demulsifier into the material obtained in the step S102, and stirring to obtain a water-based drilling fluid;
preferably, the oil-based drilling fluid preparation method comprises the following steps:
s201: adding a wetting agent into the base oil under a normal-temperature stirring state, and stirring and dissolving;
s202: adding organic soil into the solution obtained in the step 201, stirring for 2-3 hours, and then sealing and standing for 12-24 hours;
s203: and adding the oil-based filtrate reducer and the second weighting agent into the material obtained in the step 202 under the stirring condition, and stirring to obtain the oil-based drilling fluid.
10. A method of evaluating a bicontinuous drilling fluid system, characterized by characterizing the presence of a bicontinuous drilling fluid system according to any one of claims 1-8 by conductivity testing.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105419750A (en) * | 2014-09-17 | 2016-03-23 | Cesi化工有限公司 | Methods And Compositions For Use In Oil And/Or Gas Wells |
| CN109971441A (en) * | 2019-04-15 | 2019-07-05 | 西南石油大学 | A kind of interpenetrating composite, preparation method and drilling fluid containing the microemulsion and preparation method thereof |
| CN110642739A (en) * | 2019-08-08 | 2020-01-03 | 中国石油大学(北京) | PH responsive soilless phase reversible emulsified drilling fluid and preparation and reversion method thereof |
-
2021
- 2021-11-02 CN CN202111287610.0A patent/CN116064002A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105419750A (en) * | 2014-09-17 | 2016-03-23 | Cesi化工有限公司 | Methods And Compositions For Use In Oil And/Or Gas Wells |
| CN109971441A (en) * | 2019-04-15 | 2019-07-05 | 西南石油大学 | A kind of interpenetrating composite, preparation method and drilling fluid containing the microemulsion and preparation method thereof |
| CN110642739A (en) * | 2019-08-08 | 2020-01-03 | 中国石油大学(北京) | PH responsive soilless phase reversible emulsified drilling fluid and preparation and reversion method thereof |
Non-Patent Citations (3)
| Title |
|---|
| 刘佳林;罗明良;贾自龙;孙厚台;廖乐军;任斌;: "微乳液型油气增产助剂研究进展", 应用化工, vol. 40, no. 08, pages 1440 - 1443 * |
| 李波;蓝强;唐代绪;: "降低非常规储层的地层伤害和增加产气量的钻井完井液的现场研究", 国外油田工程, vol. 25, no. 06, pages 33 - 36 * |
| 高静, 李晓, 张卫英: "双连续相微乳液聚合特征与应用", 合成橡胶工业, vol. 26, no. 05, pages 319 - 323 * |
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