CN114517079A - Clay-phase-free micro-bubble drilling fluid - Google Patents
Clay-phase-free micro-bubble drilling fluid Download PDFInfo
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- 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
- C09K8/06—Clay-free compositions
- C09K8/12—Clay-free compositions containing synthetic organic macromolecular compounds or their precursors
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/58—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine
- C08F220/585—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine and containing other heteroatoms, e.g. 2-acrylamido-2-methylpropane sulfonic acid [AMPS]
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- C08F257/00—Macromolecular compounds obtained by polymerising monomers on to polymers of aromatic monomers as defined in group C08F12/00
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- C08G65/2618—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds the other compounds containing nitrogen
- C08G65/2633—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds the other compounds containing nitrogen the other compounds containing amide groups
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Abstract
The invention provides a clay-phase-free microbubble drilling fluid, which comprises: the base pulp comprises the following components in parts by weight: 0.1-0.4 parts of soda ash; 100 parts of water; the treating agent comprises the following components in parts by weight based on the water in the base slurry: 0.5-1.5 parts of foaming agent; 0.3-0.8 part of a foam stabilizer; 0.2-0.6 part of a foam reinforcing agent; 0.1-0.3 part of high-temperature stabilizer; 2-6 parts of a filtrate reducer; 2-4 parts of a wall protecting agent; 1-3 parts of an inhibitor; the high-temperature stabilizer is one of sodium sulfite, sodium thiosulfate and triethylamine. According to the invention, the viscoelastic surfactant is used as a foaming agent, and is matched with a high-temperature stabilizer, a foam reinforcing agent, a filtrate reducer, a wall protecting agent and an inhibitor in a system, so that the sealing property of the micro-bubbles to an internal air core can be improved, the compression resistance of the micro-bubbles under the conditions of high temperature and high pressure can be enhanced, the pressure-bearing plugging property of the micro-bubble drilling fluid can be improved, and the probability of well leakage can be reduced.
Description
Technical Field
The invention relates to the technical field of drilling fluid, in particular to clay-phase-free microbubble drilling fluid.
Background
After the old oil and gas fields in China are mined for a long time, the formation pressure coefficient of a reservoir layer is reduced year by year, and the formation pressure coefficient of a part of blocks is even below 1.0. In the drilling process of the low-pressure reservoir, the conventional water-based drilling fluid is easy to cause drilling fluid loss, and the low-density drilling fluid is required to be adopted to reduce the density of the drilling fluid, reduce the leakage occurrence probability and ensure the drilling construction safety.
The micro-bubble drilling fluid is a novel low-density drilling fluid system, micro-bubbles in the system are formed by three layers of surfactant molecules wrapping air, the diameter of each micro-bubble is 25-200 mu m, and the micro-bubble drilling fluid has a rigid energy accumulation effect and strong compression resistance. The microbubble drilling fluid has low system density, can be repeatedly used, is not influenced by underground tools such as MWD (measurement while drilling) and drilling fluid motors, has the advantages of no need of adding equipment for injecting gas on site and the like, can effectively block micro cracks, and can effectively prevent or reduce the leakage of the drilling fluid when drilling the micro cracks of the stratum. The conventional microbubble drilling fluid system contains clay, which is beneficial to improving the stability of microbubbles, but the clay in the system easily pollutes a reservoir during drilling, and the clay-phase-free microbubble drilling fluid is required to be used for improving the protection of the reservoir.
ZL201110252738.3 discloses a solid-free microbubble drilling fluid, but the system does not consider the insufficient stability and compression resistance of microbubbles formed by conventional surfactants under the conditions of high temperature and high pressure, so that the microbubbles are easy to break, and the leakage-proof performance of the system is seriously influenced; meanwhile, the system inhibition is not considered, which may cause the borehole wall instability in the construction process to cause the drill sticking accident.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to provide a clay-free phase microbubble drilling fluid, which does not contain clay, can improve the pressure-bearing plugging performance of the microbubble drilling fluid, and reduce the probability of lost circulation; meanwhile, the system has strong inhibition, and can effectively inhibit the hydration and dispersion of the shale.
The invention provides a clay-phase-free microbubble drilling fluid, which comprises:
the base slurry comprises the following components in parts by weight: 0.1-0.4 parts of soda ash; 100 parts of water;
the treating agent comprises the following components in parts by weight based on the water in the base slurry:
the high-temperature stabilizer is one of sodium sulfite, sodium thiosulfate and triethylamine.
Preferably, the foaming agent is dodecyl dimethyl betaine and sodium cocoyl methyl taurate.
Preferably, the mass ratio of the dodecyl dimethyl betaine to the sodium cocoyl methyl taurate is 1: (0.1-10).
Preferably, the foam stabilizer is welan gum and high-viscosity sodium carboxymethyl cellulose.
Preferably, the mass ratio of the welan gum to the high-viscosity sodium carboxymethyl cellulose is 1: (0.2-2).
Preferably, the fluid loss additive is low-viscosity sodium carboxymethyl cellulose, sulfonated phenolic resin and sulfonated lignite;
preferably, the mass ratio of the low-viscosity sodium carboxymethyl cellulose to the sulfonated phenolic resin to the sulfonated lignite is 1: (0.5-4): (0.5 to 4).
Preferably, the foam reinforcing agent is prepared from acrylamide, 2-acrylamide-2-methylpropanesulfonic acid and dimethyl allyl dodecyl ammonium chloride; the molar ratio of the acrylamide to the 2-acrylamido-2-methylpropanesulfonic acid to the dimethylallyldodecyl ammonium chloride is (4-8): (22-28): (13-17).
Preferably, the wall protecting agent is prepared from acrylamide, polystyrene and butyl methacrylate; the mass ratio of the acrylamide to the polystyrene to the butyl methacrylate is (0.5-1.5): (0.7-1.3): (1-3).
Preferably, the inhibitor is prepared from acrylamide, dimethylamine and epichlorohydrin; the mol ratio of the acrylamide to the dimethylamine to the epichlorohydrin is 1: (0.5-0.7): (0.5 to 0.7).
Compared with the prior art, the invention provides a clay-phase-free microbubble drilling fluid, which comprises the following components in percentage by weight: the base slurry comprises the following components in parts by weight: 0.1-0.4 parts of soda ash; 100 parts of water; the treating agent comprises the following components in parts by weight based on the water in the base slurry: 0.5-1.5 parts of foaming agent; 0.3-0.8 part of a foam stabilizer; 0.2-0.6 part of a foam reinforcing agent; 0.1-0.3 part of high-temperature stabilizer; 2-6 parts of a filtrate reducer; 2-4 parts of a wall protecting agent; 1-3 parts of an inhibitor; the high-temperature stabilizer is one of sodium sulfite, sodium thiosulfate and triethylamine. According to the invention, the viscoelastic surfactant is used as a foaming agent, and is matched with a high-temperature stabilizer, a foam reinforcing agent, a filtrate reducer, a wall protecting agent and an inhibitor in a system, so that the sealing property of the micro-bubbles to an internal air core can be improved, the compression resistance of the micro-bubbles under the conditions of high temperature and high pressure is enhanced, the pressure-bearing plugging property of the micro-bubble drilling fluid is improved, and the probability of well leakage occurrence is reduced; meanwhile, the system has strong inhibition, can effectively inhibit hydration and dispersion of the shale, and reduces complex underground environments such as borehole wall instability and the like in the construction process.
Drawings
Figure 1 is a graph of the PVT fluid tester results for compression resistance at 135 ℃ for example 4 and comparative example 1.
Detailed Description
The invention provides a clay-phase-free microbubble drilling fluid, which can be realized by appropriately improving process parameters by referring to the content in the text by a person skilled in the art. It is expressly intended that all such similar substitutes and modifications apparent to those skilled in the art are deemed to be within the scope of the invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those of skill in the art that variations and modifications in the methods and applications disclosed herein, or appropriate variations and combinations thereof, may be made to implement and use the techniques of this invention without departing from the spirit and scope of the invention.
The invention provides a clay-phase-free microbubble drilling fluid, which comprises:
the base slurry comprises the following components in parts by weight: 0.1-0.4 parts of soda ash; 100 parts of water;
the treating agent comprises the following components in parts by weight based on the water in the base slurry:
the high-temperature stabilizer is one of sodium sulfite, sodium thiosulfate and triethylamine.
The invention provides a clay-phase-free microbubble drilling fluid which comprises base slurry.
The base pulp is calculated by weight parts. The base slurry comprises: 0.1-0.4 parts of soda ash; specifically, it may be 0.1 part, 0.2 part, 0.3 part, or 0.4 part, or a point value between any two of the above.
The base slurry comprises 100 parts of water.
The invention provides a clay-phase-free microbubble drilling fluid which comprises a treating agent, wherein the treating agent comprises the following components in parts by weight based on water in base slurry:
according to the invention, the foaming agent is preferably 0.5-1.5 parts by weight; more preferably 0.7 to 1.3 parts; most preferably 0.8 to 1.2. In the present invention, the foaming agent is preferably dodecyl dimethyl betaine and sodium cocoyl methyl taurate. In the present invention, the mass ratio of the dodecyl dimethyl betaine to the sodium cocoyl methyl taurate is preferably 1: (0.1 to 10), more preferably 1: (0.5 to 8), more preferably 1: (1 to 6), more preferably 1: (2-5), most preferably 1: (3-4).
In the invention, the weight portion of the foam stabilizer is preferably 0.3-0.8, and more preferably 0.3-0.7. In the invention, the foam stabilizer is preferably welan gum and high-viscosity sodium carboxymethyl cellulose. In the invention, the mass ratio of the welan gum to the high-viscosity sodium carboxymethyl cellulose is preferably 1: (0.2-2), more preferably 1: (0.5 to 1.5), more preferably 1: (0.8 to 1.2), and most preferably 1: 1.
In the invention, the weight part of the foam reinforcing agent is preferably 0.2-0.6 part, and more preferably 0.3-0.6 part. In the invention, the foam reinforcing agent is prepared from the following raw materials:
acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, and dimethylallyldodecylammonium chloride.
In the invention, the mol ratio of the acrylamide to the 2-acrylamido-2-methylpropanesulfonic acid to the dimethylallyldodecylammonium chloride is preferably (4-8): (22-28): (13-17), more preferably (5-7): (24-26): (14-16), and most preferably 6:25: 15.
In the invention, the relative molecular mass of the foam reinforcing agent is preferably 30000-45000, more preferably 35000-40000, and most preferably 35000.
In the present invention, the method for preparing the foam enhancer is preferably:
under the action of thioglycollic acid and ammonium persulfate, reacting a dodecyl dimethyl allyl ammonium chloride solution, an acrylamide solution and a 2-acrylamide-2-methylpropanesulfonic acid solution to obtain a foam reinforcing agent solution.
In the invention, the reaction temperature is preferably 85-95 ℃, more preferably 88-92 ℃, and most preferably 90 ℃. In the present invention, the reaction time is preferably 0.5 to 1.5 hours, more preferably 0.8 to 1.2 hours, and most preferably 1 hour.
In the present invention, it is preferable to adjust the pH of the reaction system to 8 with an alkaline substance after the completion of the reaction.
In the present invention, the method for preparing the foam enhancer is more preferably:
adding mercaptoacetic acid, a dodecyl dimethyl allyl ammonium chloride solution, an acrylamide solution and a 2-acrylamide-2-methyl propanesulfonic acid solution into a reaction vessel, heating to 55-65 ℃, then adding an ammonium persulfate solution into a reaction system, heating the system to 85-95 ℃, reacting for 0.5-1.5 hours, and adjusting the pH value of the solution to 8 by using sodium hydroxide to obtain a foam reinforcing agent solution.
In the invention, the temperature of the temperature rise is preferably 58-62 ℃, and more preferably 60 ℃. In the present invention, the reaction temperature and time are the same as those in the above technical scheme, and are not described herein again.
In the invention, the high-temperature stabilizer is 0.1-0.3 weight part; preferably, it may be 0.1 parts by weight, 0.2 parts by weight or 0.3 parts by weight.
The high-temperature stabilizer is one of sodium sulfite, sodium thiosulfate and triethylamine. The present invention is not limited in its source, and may be commercially available.
In the invention, the weight part of the fluid loss additive is preferably 2-6 parts, and more preferably 5 parts. In the present invention, the fluid loss additive is preferably low viscosity sodium carboxymethyl cellulose, sulfonated phenol resin, and sulfonated lignite. In the invention, the mass ratio of the low-viscosity sodium carboxymethyl cellulose to the sulfonated phenolic resin to the sulfonated lignite is preferably 1: (0.5-4): (0.5 to 4), more preferably 1: (1-3): (1-3), most preferably 1: (1.5-2.5): (1.5-2.5).
In the invention, the weight part of the wall protecting agent is preferably 2-4 parts, and more preferably 3-4 parts. In the invention, the wall protecting agent is prepared from the following raw materials:
acrylamide, polystyrene and butyl methacrylate.
In the invention, the mass ratio of the acrylamide to the polystyrene to the butyl methacrylate is preferably (0.5-1.5): (0.7-1.3): (1-3), more preferably (0.8-1.2): (0.8-1.2): (1.5-2.5), and most preferably 1:0.8: 2.
In the invention, the wall protecting agent is preferably a wall protecting agent aqueous solution, and the mass concentration of the wall protecting agent aqueous solution is preferably 25-35%, more preferably 27-32%, and most preferably 30%. In the present invention, the viscosity of the aqueous solution of the wall protecting agent is preferably 10 to 15 mPas.
In the present invention, the preparation method of the wall protecting agent is preferably:
mixing acrylamide, sodium dodecyl benzene sulfonate and water to obtain a water phase;
mixing polystyrene foam, octylphenol polyoxyethylene ether and butyl methacrylate to obtain an organic phase;
dropwise adding the organic phase into the water phase for emulsification to obtain emulsion;
and introducing nitrogen into the emulsion, and then adding azodiisobutyl amidine hydrochloride to react to obtain the wall protecting agent.
In the present invention, the polystyrene foam is preferably a waste polystyrene foam.
In the invention, the mass ratio of the acrylamide to the sodium dodecyl benzene sulfonate to the water is preferably (13-17): (1-3): (180-220), more preferably (14-16): (1.5-2.5): (190-210), most preferably 15:2: 205.
In the invention, the mass ratio of the polystyrene foam to the octylphenol polyoxyethylene ether to the butyl methacrylate is preferably (10-20): (1-3): (55-65), more preferably (12-18): (1.5-2.5): (58-62), most preferably (14-16): 2:60.
In the invention, the temperature of the organic phase dripped in the water phase is preferably 40-50 ℃, more preferably 42-48 ℃, and most preferably 44-46 ℃; the time for dripping the organic phase into the water phase is preferably 20-30 min, more preferably 22-28 min, and most preferably 24-26 min.
In the invention, the rotation speed in the emulsification process is preferably 550-650 rpm, more preferably 580-620 rpm, and most preferably 600 rpm; the emulsifying time is preferably 0.5 to 1.5 hours, more preferably 0.8 to 1.2 hours, and most preferably 1 hour.
In the invention, the temperature of the nitrogen introduced into the emulsion is preferably 55-65 ℃, more preferably 58-62 ℃, and most preferably 60 ℃; the time for introducing nitrogen into the emulsion is preferably 25-35 min, more preferably 28-32 min, and most preferably 30 min.
In the present invention, the azobisisobutyramidine hydrochloride is preferably an azobisisobutyramidine hydrochloride solution. In the invention, the time for adding the azodiisobutyramidine hydrochloride for reaction is preferably 5 to 7 hours, more preferably 5.5 to 6.5 hours, and most preferably 6 hours.
In the invention, the weight part of the inhibitor is preferably 1-3 parts, and specifically may be 1 part, 2 parts or 3 parts. In the present invention, the inhibitor is preferably prepared from:
acrylamide, dimethylamine and epichlorohydrin.
In the present invention, the molar ratio of acrylamide, dimethylamine and epichlorohydrin is preferably 1: (0.5-0.7): (0.5 to 0.7), more preferably 1: (0.5-0.6): (0.5 to 0.6), and most preferably 1:0.6: 0.6.
In the invention, the relative molecular mass of the inhibitor is preferably 4-5 ten thousand, and more preferably 4 ten thousand.
In the present invention, the preparation method of the inhibitor is preferably:
reacting an acrylamide solution with dimethylamine to obtain a reaction product;
reacting the reaction product with epoxy chloropropane to obtain an intermediate product;
and reacting the intermediate product with ammonium persulfate to obtain the inhibitor.
In the invention, the reaction temperature of the acrylamide solution and the dimethylamine is preferably 20-30 ℃, more preferably 22-28 ℃, and most preferably 24-26 ℃; the reaction time of the acrylamide solution and dimethylamine is preferably 1.5-2.5 hours, and more preferably 2 hours.
In the invention, the reaction temperature of the reaction product and epichlorohydrin is preferably 55-65 ℃, more preferably 58-62 ℃, and most preferably 60 ℃; the reaction time of the reaction product and the epichlorohydrin is preferably 0.5-1.5 hours, more preferably 0.8-1.2 hours, and most preferably 1 hour.
In the invention, the reaction temperature of the intermediate product and ammonium persulfate is preferably 85-95 ℃, more preferably 88-92 ℃, and most preferably 90 ℃; the reaction time of the intermediate product and ammonium persulfate is preferably 0.3-0.7 hour, more preferably 0.4-0.6 hour, and most preferably 0.5 hour.
The foam reinforcing agent can generate a synergistic effect with a foaming agent, so that the wall thickness of the micro-bubbles is increased, the sealing property of the micro-bubbles to air cores in the micro-bubbles is improved, and the stability and the compression resistance of the micro-bubbles under the conditions of high temperature and high pressure are enhanced; the wall protecting agent can be bonded on the surface of a well wall to form a film, and the micro cracks of the well wall are sealed, so that the wall protecting agent and the micro bubbles generate a synergistic effect, the pressure-bearing plugging performance of the micro bubble drilling fluid is obviously improved, and the drilling fluid leakage occurrence probability in the drilling process of a low-pressure easily-leaked stratum is reduced. According to the invention, the high-temperature performance of the drilling fluid is improved by adding the high-temperature stabilizer, and the viscoelastic surfactant is used as a foaming agent and matched with the high-temperature stabilizer, the foam reinforcing agent, the filtrate reducer, the wall protecting agent and the inhibitor in the system, so that the sealing property of the micro-bubbles to an internal air core can be improved, the compression resistance of the micro-bubbles under the conditions of high temperature and high pressure is enhanced, the pressure-bearing plugging performance of the micro-bubble drilling fluid is improved, and the probability of well leakage is reduced; meanwhile, the system has strong inhibitive performance, can effectively inhibit the hydration and dispersion of the shale, and reduces the underground complex environments such as borehole wall instability and the like in the construction process.
In the invention, the preparation method of the microbubble drilling fluid is preferably as follows:
adding soda ash into water, mixing, and preparing to obtain base slurry;
and sequentially adding the treating agents, namely the foaming agent, the foam stabilizer, the foam reinforcing agent, the high-temperature stabilizer, the filtrate reducer, the wall protecting agent and the inhibitor into the base slurry, and stirring to obtain the micro-bubble drilling fluid.
The stirring method of the present invention is not limited and those skilled in the art can easily understand the method.
The clay-free phase microbubble drilling fluid disclosed by the invention has the temperature resistance of 135 ℃ and the density of 0.80-1.0 g/cm3The micro-bubble anti-compression agent is adjustable, the micro-bubble stability and the anti-compression capability are strong, the anti-leakage performance is outstanding, the inhibition performance and the reservoir protection effect are good, and the anti-leakage effect is good in low-pressure easily-leaked stratum.
In order to further illustrate the present invention, the following detailed description is made of a clay-phase-free micro-bubble drilling fluid provided by the present invention with reference to the following examples.
EXAMPLE 1 preparation of foam enhancer
Dissolving 10g of dodecyl dimethyl allyl ammonium chloride in 100g of clear water for later use;
dissolving 80g of acrylamide and 10g of 2-acrylamido-2-methylpropanesulfonic acid in 250g of clear water for later use;
dissolving 1g of ammonium persulfate in 50g of clear water for later use;
adding 0.1g of thioglycolic acid, a dodecyl dimethyl allyl ammonium chloride solution, acrylamide and a 2-acrylamide-2-methyl propanesulfonic acid solution into a reaction container, heating to 60 ℃, then adding an ammonium persulfate solution into a reaction system, heating the system to 90 ℃, reacting for 1 hour, and adjusting the pH value of the solution to 8 by using NaOH to obtain the foam reinforcing agent with the solid phase content of 20%.
EXAMPLE 2 preparation of a Barrier
Adding 15g of acrylamide, 2.1g of sodium dodecyl benzene sulfonate and 205g of distilled water into a four-neck flask, and uniformly stirring to obtain a water phase;
dissolving 15.0g of polystyrene foam and 2.1g of octylphenol polyoxyethylene ether in 60.0g of butyl methacrylate to obtain an organic phase;
uniformly dripping the organic phase into the water phase within 30min at 45 deg.C, emulsifying at 600rpm for 1 hr, and heating to 6 ℃ 0 ℃ C, introducing N2After 30min, 5g of aqueous solution containing 0.27g of azobisisobutyramidine hydrochloride was added, and the reaction was stopped after 6 hours to obtain a wall protecting agent.
EXAMPLE 3 preparation of inhibitors
Dissolving 100g of acrylamide in 300g of water, adding 50g of dimethylamine after uniformly stirring, reacting at room temperature for 2 hours, heating to 35 ℃, adding 50g of epichlorohydrin in batches into a reactor, heating the obtained solution to 60 ℃, reacting for 1 hour, adding 10mL of aqueous solution containing 1.5g of ammonium persulfate, heating to 90 ℃, and reacting for 0.5 hour to obtain the inhibitor.
Example 4
0.3g of soda ash is added into 100g of clear water, the mixture is stirred uniformly to obtain base slurry (1), then 0.8g of foaming agent (prepared by mixing dodecyl hydroxypropyl sulphobetaine and sodium cocoyl methyl taurate in a ratio of 1: 0.5), 0.4g of foam stabilizer (prepared by mixing Wenlun glue and high-viscosity sodium carboxymethyl cellulose in a ratio of 1: 0.6), 0.3g of foam enhancer, 0.1g of sodium sulfite, 3g of filtrate reducer (prepared by mixing low-viscosity sodium carboxymethyl cellulose and sulfonated phenolic resin in a ratio of 1:2: 2), 2g of wall protecting agent and 1.5g of inhibitor are added into the base slurry (1) in sequence, and the treating agent is mixed uniformly by a stirrer for standby.
Examples 5 to 8
The microbubble drilling fluid prepared by the method of example 4 is different from example 4 in the ratio of the used raw materials, and the used raw materials of examples 5 to 8 are shown in table 1.
TABLE 1 dosage of raw materials used for preparing micro-bubble drilling fluid in examples 5-8
Comparative example 1
Sodium dodecyl sulfate was used as a foaming agent, and the other treating agents were the same as in example 4, and the density was also 0.87g/cm3。
Comparative example 2
Adding 3g of bentonite and 0.15g of soda into 100g of clear water, stirring at a high speed for 2 hours, and standing and maintaining at room temperature for 24 hours to obtain base slurry;
0.8g of a foaming agent (a mixture of dodecyl dimethyl betaine and sodium cocoyl methyl taurate in a mass ratio of 1: 0.5), 0.3g of a foam stabilizer (a mixture of welan gum and high-viscosity sodium carboxymethyl cellulose in a mass ratio of 1: 0.8), 0.3g of the foam enhancer prepared in example 1, 5g of a fluid loss additive (a mixture of low-viscosity sodium carboxymethyl cellulose, a sulfonated phenol resin and sulfonated lignite in a mass ratio of 1:2: 2), 3g of the wall protecting agent prepared in example 2, and 1.3g of the inhibitor prepared in example 3 were added to the base slurry, and mixed uniformly with a stirrer to obtain a micro-bubble drilling fluid.
Example 9
Foaming the drilling fluid prepared in the examples 4-8 by using a stirrer, and stirring for 10min at 600 revolutions per minute to obtain the drilling fluid with the density of 0.87g/cm3And (3) evaluating the performance of the microbubble drilling fluid.
(1) Evaluation of temperature resistance
The foamed micro-bubble drilling fluid is aged for 16 hours at the high temperature of 135 ℃, the rheological property of the drilling fluid is measured by using a six-speed rotational viscosity agent, and the detection result is shown in table 2.
TABLE 2 temperature resistance of micro-bubble drilling fluids prepared in accordance with the examples of the present invention
As can be seen from Table 2, the microbubble drilling fluid shows good temperature resistance due to little change in the rheological property and density of the system after being aged at a high temperature of 135 ℃.
(2) Evaluation of leakage prevention Performance
Adding 40-60 meshes of sand with the same volume into a visual sand bed respectively, then adding 350mL of clay-free phase microbubble drilling fluid and 5% bentonite-based slurry (5 g of bentonite and 0.3g of soda ash are added into 100g of clear water, stirring at a high speed for 2 hours, and standing and maintaining at room temperature for 24 hours to obtain 5% bentonite-based slurry) into a visual sand bed simulation leakage blocking device respectively for comparison test, wherein the results are shown in Table 3.
TABLE 30.7 MPa evaluation of the leak-proof Performance of different drilling fluids
As can be seen from table 3, compared with 5% bentonite-based slurry, the clay-phase-free microbubble drilling fluid can significantly reduce the drilling fluid leakage in the visual sand bed simulated plugging device.
(3) Core permeability recovery value
A109-Wen well core (2818-2823 m well section, mud-containing sandstone) is taken, a core flow experiment instrument and a core vacuum saturation device are utilized to measure the permeability recovery values of the clay-phase-free microbubble drilling fluid system prepared in the examples 4-8 and the core of the microbubble drilling fluid system added with 4% of bentonite, and the experiment results are shown in the following table.
TABLE 4 core Permeability recovery values for different types of drilling fluid systems
From the table above, it can be seen that compared with the drilling fluid containing 4% of bentonite microbubble, the clay-phase-free microbubble drilling fluid has significantly reduced pollution to the reservoir, and the core permeability recovery value of example 4 reaches 94.9%, which indicates that the pollution degree to the reservoir is low and the reservoir protection performance is good.
(4) Evaluation of inhibitory Properties
Using rock debris at 2700m deep in a horse 12 well, drying 2.0-3.8 mm shale to constant weight at 105 +/-3 ℃, and cooling to room temperature. Weighing 10G of shale (G)0) Placing into the drilling fluid prepared in example 4, rolling for 16h at 120 ℃, taking out after cooling, recovering the core by using a sieve with the aperture of 0.42mm, drying to constant weight at 105 +/-3 ℃, cooling to room temperature and weighing the recovered core (G)1) (ii) a Then putting the weighed and recovered rock core into clear water at 120 DEG CRolling for 2h, cooling, taking out, recovering core with 0.42mm mesh sieve, drying at 105 + -3 deg.C to constant weight, cooling to room temperature, and weighing the recovered core quality (G)2) Calculating the shale recovery rate according to the following formula:
primary shale recovery rate
Recovery rate of secondary shale
Relative shale recovery rate
TABLE 5 comparison of shale recoveries of different fluids
As can be seen from table 4, the cuttings are heavily dispersed in the clear water with a recovery of only 2.7%. The clay-phase-free microbubble drilling fluid prepared in example 4 has obviously improved inhibition performance, the primary shale recovery rate reaches 96.3%, the relative recovery rate reaches 97.4%, and the recovered shale has clear edges and corners and shows good inhibition performance.
(5) Resistance to compression
The compression resistance of example 4 and comparative example 1 was evaluated at 135 c using a PVT fluid tester and the results are shown in fig. 1, and fig. 1 is a graph of the compression resistance of the PVT fluid tester at 135 c for example 4 and comparative example 1.
As can be seen from FIG. 1, the clay-phase-free microbubble drilling fluid prepared in example 4 has high compressibility resistance, and the drilling fluid still maintains low density under the high-pressure conditions at the bottom of a well, which is beneficial to the exertion of the leakage-proof performance of the system.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A clay-phase-free micro-bubble drilling fluid comprising:
the base slurry comprises the following components in parts by weight: 0.1-0.4 parts of soda ash; 100 parts of water;
the treating agent comprises the following components in parts by weight based on the water in the base slurry:
the high-temperature stabilizer is one of sodium sulfite, sodium thiosulfate and triethylamine.
2. The micro-bubble drilling fluid of claim 1, wherein the foaming agent is dodecyl dimethyl betaine and sodium cocoyl methyl taurate.
3. The micro-bubble drilling fluid according to claim 2, wherein the mass ratio of the dodecyl dimethyl betaine to the sodium cocoyl methyl taurate is 1: (0.1-10).
4. The micro-bubble drilling fluid according to claim 1, wherein the foam stabilizer is welan gum and high-viscosity sodium carboxymethyl cellulose.
5. The micro-bubble drilling fluid according to claim 4, wherein the mass ratio of the welan gum to the high-viscosity sodium carboxymethyl cellulose is 1: (0.2-2).
6. The micro-bubble drilling fluid according to claim 1, wherein the fluid loss additive is low viscosity sodium carboxymethyl cellulose, sulfonated phenolic resin, and sulfonated lignite.
7. The micro-foam drilling fluid according to claim 1, wherein the mass ratio of the low-viscosity sodium carboxymethyl cellulose to the sulfonated phenolic resin to the sulfonated lignite is 1: (0.5-4): (0.5 to 4).
8. The micro-bubble drilling fluid according to claim 1, wherein the foam enhancer is prepared from a mixture comprising acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, and dimethylallyldodecylammonium chloride; the mol ratio of the acrylamide to the 2-acrylamido-2-methylpropanesulfonic acid to the dimethylallyldodecylammonium chloride is (4-8): (22-28): (13-17).
9. The micro-bubble drilling fluid according to claim 1, wherein the wall protecting agent is prepared from a group consisting of acrylamide, polystyrene and butyl methacrylate; the mass ratio of the acrylamide to the polystyrene to the butyl methacrylate is (0.5-1.5): (0.7-1.3): (1-3).
10. The micro-bubble drilling fluid according to claim 1, wherein the inhibitor is prepared from a mixture comprising acrylamide, dimethylamine and epichlorohydrin; the mol ratio of the acrylamide to the dimethylamine to the epichlorohydrin is 1: (0.5-0.7): (0.5 to 0.7).
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