NL2013995B1 - High temperature resisting temporary plugging agent with self deplugging for water-based drilling fluid and preparing method thereof. - Google Patents
High temperature resisting temporary plugging agent with self deplugging for water-based drilling fluid and preparing method thereof. Download PDFInfo
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
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Abstract
The present disclosure provides a high temperature resisting temporary plugging agent with self deplugging for water-based drilling fluid, comprising products obtained by reaction of starch, alkali metal hydroxide, halogenated organic acid, carbonate, hydrophobic modifier, alcohol and water, and nano-calcium carbonate. The present disclosure further provides a preparing method for said high temperature resisting temporary plugging agent with self deplugging for water-based drilling fluid, comprising feeding said components with said proportion to a kneader, and kneading said components to obtain said high temperature resisting temporary plugging agent with self deplugging for water-based drilling fluid. The temporary plugging agent of the present disclosure has relatively good high temperature resistance, which reaches 140 oC, and has good temporary plugging effect and significant reservoir protection effect. Both the temporary plugging rate and the recovery rate of permeability of oil of water-based drilling fluid added with said temporary plugging agent are quite high. The temporary plugging agent of the present disclosure has self deplugging ability, and self deplugging can be realized through the formation of hydrophobic channels during backflow process in subsequent process. No pickling for removing the mud cake process is necessary, and thus the secondary damage to the reservoir can be avoided.
Description
Title: High temperature resisting temporary plugging agent with self deplugging for water-based drilling fluid and preparing method thereof
Field of the Invention
The present disclosure relates to the technical field of hydrophobic temporary plugging with self deplugging during oil drilling, and particularly to a high temperature resisting temporary plugging agent with self deplugging for water-based drilling fluid used for protecting a reservoir and a preparing method thereof.
Background of the Invention
The reservoir protection technology during drilling process is used for, preventing the drilling fluid from penetrating into the reservoir as much as possible, and preventing the plugging of reservoir caused by penetrated components to the largest extent. In recent years, the temporary plugging technology is mainly used as a reservoir protection measure during drilling process, wherein enough bridge particles and filling particles matching with reservoir pores are added to the drilling fluid and a temporary plugging annulus is formed at the zone near the wellbore, whereby various damages resulted from solid substances and filtrate of the drilling fluid penetrating into the reservoir can be avoided effectively. When the drilling completed, the plugging thereof can be removed through perforating, acid dissolution, and oil dissolution, whereby the reservoir can be protected. Since the shielding temporary plugging technology is successfully developed and applied in China in 1990s, various temporary plugging agents are emerging one after another, including water soluble temporary plugging agents, acid soluble temporary plugging agents, alkali soluble temporary plugging agents, and oil soluble temporary plugging agents, all of which are developed and used widely.
However, although the shielding temporary plugging technology is promoted vigorously and various temporary plugging agent products are used widely, there are still many technical problems to be solved in China in the development and application of temporary plugging agents. On one hand, the high temperature resistance of temporary plugging agents needs to be improved urgently. Ordinary temporary plugging agents would be degraded after being injected into the pay zone owing to their poor high temperature resistance and cannot play the role of temporary plugging. On the other hand, there are many inherent disadvantages in conventional temporary plugging agents. For example, using acid soluble temporary plugging agents would cause secondary damage to the reservoir during adding process for removing the mud cake. The disadvantages of oil soluble temporary plugging agents are as follows. First, the softening temperature of oil soluble temporary plugging agent is not necessary for its unique appropriate using temperature, and in practice, the granularity of temporary plugging agent and the diameter of core pores should be matched on the basis of the matching of the using temperature and the softening temperature of temporary plugging agent, which is difficult to be realized. Second, the oil soluble resinous materials would stick to the screen during circulating out and plugging removal process, which would cause unnecessary trouble for the operation thereof. Third, the high temperature resistance of oil soluble temporary plugging agent is generally poor.
The technology of hydrophobic temporary plugging with self deplugging provides a new idea for solving the aforesaid problems, wherein hydrophobic modifying particles and hydrophobic modifying polymer are cross finked, and a hydrophobic channel through the mud cake can be formed by the hydrophobic components. During the drilling and completion, the channel can control the invasion of filtrate, and simultaneously form effective oil flow paths in the mud cake, whereby oil and gas can enter into the bore-hole easily. The water permeability of the mud cake produced therein is rather low, while the oil permeability thereof is very high. The temporary plugging agent can dissociate automatically and gradually in the oil flow during the production, and thus the effect of self deplugging can be achieved. No chemical gel breaker is necessary in the technology of hydrophobic temporary plugging with self deplugging, and the secondary damage to the reservoir during pickling process for removing the mud cake can be avoided. The technology of hydrophobic temporary plugging with self deplugging, having advantages of easy and convenient, high efficient, and without side effects, is mainly used in the operation of open hole completions, and also has unique advantages in the operation of non-open hole completions. A drilling fluid treatment agent used for protecting the reservoir is raised by Lan Qiang et al (CN 102134479A), wherein the hydrophobization of starch and octenyl succinic anhydride is conducted in 15% ethanol solution, nano-calcium carbonate is added, and said drilling fluid treatment agent is produced. The treatment agent, which can reduce the starting pressure of oil flow effectively, is used for protecting the reservoir. The recovery rate of permeability of oil thereof is very high, but the high temperature resistance thereof is only 115 °C. A temporary plugging agent for drilling fluid is raised by Zhen Jianwu et al (CN 102911647A), wherein 2-acrylamide-2-methylpro panesulfonic acid, acrylic acid, acrylamide, cross linker made of inorganic materials and inorganic aluminum salt, N,N’-methylene bisacrylamide organic cross linker and initiator are cross linked under alkaline condition, and said temporary plugging agent for drilling fluid is produced. The high temperature resistance of said temporary plugging agent reaches 150 °C. The temporary plugging agent can plug the throats of side-wall effectively, reduce the penetration of filtrate into the reservoir, and promote the productivity of the reservoir. However, since the temporary plugging agent is acid soluble, the permeability of the reservoir needs to be recovered through plugging removal by pickling. Thus, the temporary plugging agent with good high temperature resistance and self deplugging ability is not reported until now.
Summary of the Invention
To overcome the disadvantages in the prior temporary plugging technology, the present disclosure provides a high temperature resisting temporary plugging agent with self deplugging for water-based drilling fluid, which has the advantages of good high temperature resistance and self deplugging ability, as well as desirable protection of the reservoir. Simultaneously, the present disclosure also provides a preparing method for the aforesaid temporary plugging agent.
To achieve the aforesaid purpose, the technical solution of the present disclosure is as follows. A high temperature resisting temporary plugging agent with self deplugging for water-based drilling fluid, comprising products obtained by reaction of starch, alkali metal hydroxide, halogenated organic add, carbonate, hydrophobic modifier, alcohol and water, and nano-calcium carbonate.
In one preferred embodiment of the present disclosure, said temporary plugging agent comprises the products obtained by reaction of 1000 parts by mass of starch, 250-350 parts by mass of alkali metal hydroxide, 350-500 parts by mass of halogenated organic acid, 50-150 parts by mass of carbonate, 120-250 parts by mass of hydrophobic modifier, 600-1000 parts by volume of alcohol and 50-150 parts by volume of water, and 800-1200 parts by mass of nano-calcium carbonate, wherein the parts by mass in grams, and parts by volume in milliliters.
In the present disclosure, the products obtained by reaction of starch, alkali metal hydroxide, halogenated organic acid, carbonate, hydrophobic modifier, alcohol and water are starch granules with hydrophobic modifying functional groups. The structural formula of said hydrophobic modifying functional groups are
and/or
, wherein R is any one selected from a group consisting of H, CH3, CH2CH3 and COC1.
In one preferred embodiment of the present disclosure, said alkali metal hydroxide is at least one selected from a group consisting of hthium hydroxide, sodium hydroxide, and potassium hydroxide, and preferably, sodium hydroxide is selected. The role of sodium hydroxide is, on one hand, entering into the structural units of starch to form active centers of etherification, and on the other hand, promoting rapid swelling of starch and opening intramolecular channels thereof, to facilitate fully contact and reaction of etherifying agent and starch.
In one preferred embodiment of the present disclosure, said halogenated organic acid is at least one selected from a group consisting of fluorinated organic acid, chlorinated organic acid, brominated organic acid, and iodinated organic acid, and preferably, chloroacetic acid is selected. Chloroacetic acid, serving as etherifying agent, can introduce carboxymethyl groups into the structural units of starch, and promote high temperature resistance of the temporary plugging agent significantly.
In one preferred embodiment of the present disclosure, said carbonate is selected from sodium carbonate and/or potassium carbonate, and preferably, sodium carbonate is selected. Sodium carbonate can promote the reaction of hydrophobic modifier and the structural units of starch, and thus the hydrophobic modification reaction can proceed more sufficiently, whereby the temporary plugging agent with high hydrophobicity can be obtained, and the effect of hydrophobic temporary plugging with self deplugging becomes more evident.
In one preferred embodiment of the present disclosure, said starch is waxy maize starch. Waxy maize starch is almost all amylopectin, and the paste thereof is stable and is not easy to be aged. The expansivity thereof is high, which is 2.5 times the expansivity of common maize starch. In addition, the waxy maize starch has the advantages of high transparency and good film-forming property.
In one preferred embodiment of the present disclosure, said hydrophobic modifier is at least one selected from a group consisting of benzoyl chloride, 4-methylbenzoyl chloride, 4-ethylbenzoyl chloride, terephthaloyl chloride, sodium benzoate, and sodium phenylacetate.
In one preferred embodiment of the present disclosure, an oil (Dioctyl Phthalate, DOP) absorption value of said nano-calcium carbonate is 25-40 ml/100g, and a particle size thereof is 40-60 nm.
In one preferred embodiment of the present disclosure, said alcohol is at least one selected from a group consisting of ethanol, propanol, and isopropanol, and preferably, ethanol is selected. Ethanol, serving as the reaction medium, can promote the swelling of starch, and ensure the heat of the system spreading uniformly, so that the reaction can proceed smoothly.
The present disclosure further provides a preparing method for said high temperature resisting temporary plugging agent with self deplugging for water-based drilling fluid, comprising feeding said components with said proportion to a kneader, and kneading said components to obtain said high temperature resisting temporary plugging agent with self deplugging for water-based drilling fluid.
In one preferred embodiment of the present disclosure, the preparing method for said high temperature resisting temporary plugging agent with self deplugging for water-based drilling fluid comprises the steps of: (1) feeding starch to a kneader, adding a first part of said alkali metal hydroxide, a first part of said alcohol and water to said kneader, and performing kneading; (2) adding a second part of said alkali metal hydroxide, said halogenated organic acid, and a second part of said alcohol to a product obtained in step (1), and performing kneading; (3) adding carbonate to a product obtained in step (2), and performing kneading; (4) adding a third part of said alcohol and hydrophobic modifier to a product obtained in step (3), and performing kneading; and (5) adding nano-calcium carbonate to a product obtained in step (4), and performing kneading to obtain said high temperature resisting temporary plugging agent with self deplugging for water-based drilling fluid.
Preferably, in the aforementioned preparing method, 1000 parts by mass of starch is taken as the standard, thus, the first part of alkali metal hydroxide is 100-150 parts by mass, and the second part of alkali metal hydroxide is 150-200 parts by mass; the first part of alcohol is 200-300 parts by volume, the second part of alcohol is 200-300 parts by volume, and the third part of alcohol is 200-400 parts by volume.
Preferably, in the aforesaid preparing method, the product obtained in step e), after being discharged, is washed 3-5 times by organic solvent, dried in vacuum with the temperature of 55-70 °C, and crushed to obtain said high temperature resisting temporary plugging agent with self deplugging for water-based drilling fluid, wherein said organic solvent is at least one selected from a group consisting of ethanol, propanol, isopropanol, acetone, ether, and petroleum ether.
In one most preferred embodiment of the present disclosure, the preparing method for said high temperature resisting temporary plugging agent with self deplugging for water-based drilling fluid comprises the steps of: (1) 1000 parts by mass of starch is fed to a kneader, 100-150 parts by mass of sodium hydroxide, 200-300 parts by volume of ethanol, and 50-150 parts by volume of water are added to the kneader, and the kneading reaction proceeds for 50-80 minutes in a closed environment with the temperature of 20-30 °C; (2) 150-200 parts by mass of sodium hydroxide, 350-500 parts by mass of chloroacetic acid, and 200-300 parts by volume of ethanol are added to the product obtained in step (1), and the kneading reaction proceeds for 100-180 minutes in a closed environment with the temperature of 40-60 °C; (3) 50-150 parts by mass of sodium carbonate is added to the product obtained in step (2) after said product is cooled, and the kneading reaction proceeds for 40-80 minutes in a closed environment with the temperature of 20-30 °C; (4) 200-400 parts by volume of ethanol, and 120-250 parts by mass of hydrophobic modifier are added to the product obtained in step (3), and the kneading reaction proceeds for 60-120 minutes in a closed environment with the temperature of 30-50 °C; (5) 800-1200 parts by mass of nano-calcium carbonate is added to the product obtained in step (4), and the kneading reaction proceeds for 40-80 minutes in a closed environment with the temperature of 30-50 °C; and (6) stop stirring, the temperature thereof drops to room temperature, and the material in the kneader is discharged after another 3-6 hours, washed 3-5 times by organic solvent, dried in vacuum with the temperature of 55-70 °C, and crushed to obtain said high temperature resisting temporary plugging agent with self deplugging for water-based drilling fluid.
Compared with the prior art, the present disclosure has the following advantages. (1) The temporary plugging agent of the present disclosure has relatively good high temperature resistance, which reaches 140 °C. (2) The temporary plugging agent of the present disclosure has good temporary plugging effect and significant reservoir protection effect. Both the temporary plugging rate and the recovery rate of permeability of oil of water-based drilling fluid added with said temporary plugging agent are quite high. (3) The temporary plugging agent of the present disclosure has self deplugging ability, and self deplugging can be realized through the formation of hydrophobic channels during backflow process in subsequent process. No pickling for removing the mud cake process is necessary, and thus the secondary damage to the reservoir can be avoided. (4) The temporary plugging agent of the present disclosure does not have a big effect on the viscosity of water-based drilling fluid, and has good compatibility with various drilling fluid agents. (5) The temporary plugging agent of the present disclosure is manufactured through kneading, and the whole process proceeds in a kneader. Therefore, the reaction thereof is sufficient and uniform, and the reaction can be conducted in large quantities. The using amount of organic solvent is small, the production cost thereof is relatively low, and the harmful effect on the environment can be reduced to a large extent.
Detailed Description of the Embodiments
The present disclosure will be explained in detail in combination with the examples, but the protection scope of the present disclosure is not limited by the embodiments disclosed herein.
Example 1
The preparing method for high temperature resisting temporary plugging agent with self deplugging for water-based drilling fluid according to the present disclosure comprises the steps of: (1) 1000 g of starch is fed to a kneader, 100 g of sodium hydroxide, 200 mL of propanol, and 100 mL of water are added to the kneader, and the kneading reaction proceeds for 50 minutes in a closed environment with the temperature of 20 °C; (2) 150 g of sodium hydroxide, 350 g of chloroacetic acid, and 200 mL of propanol are added to the product obtained in step (1), the temperature thereof is raised to 40 °C, and the kneading reaction proceeds for 100 minutes in a closed environment with such temperature; (3) the product obtained in step (2) is cooled, 50 g of sodium carbonate is added to the product, and the kneading reaction proceeds for 40 minutes in a closed environment with the temperature of 20 °C; (4) 200 mL of propanol, and 120 g of 4-methylbenzoyl chloride are added to the product obtained in step (3), the temperature thereof is raised to 30 °C, and the kneading reaction proceeds for 60 minutes in a closed environment with such temperature; (5) 800 g of nano-calcium carbonate (an oil absorption value thereof is 25 ml/100g, and a particle size thereof is 40 nm) is added to the product obtained in step (4), and the kneading reaction proceeds for 40 minutes in a closed environment with the temperature of 30 °C; and (6) stop stirring, the temperature thereof drops to room temperature, and the material in the kneader is discharged after another 3 hours, washed 3 times by isopropanol, dried in vacuum with the temperature of 55 °C for 24 hours, and crushed to obtain said high temperature resisting temporary plugging agent with self deplugging for water-based drilling fluid.
The high temperature resisting temporary plugging agent with self deplugging for water-based drilling fluid manufactured by the method of the present example comprises hydrophobic modifying starch obtained by reaction of 1000 g of starch, 250 g of sodium hydroxide, 350 g of chloroacetic acid, 50 g of sodium carbonate, 120 g of 4-methylbenzoyl chloride serving as hydrophobic modifier, 600 mL of propanol and 100 mL of water, and 800 g of nano-calcium carbonate.
Example 2
The preparing method for high temperature resisting temporary plugging agent with self deplugging for water-based drilling fluid according to the present disclosure comprises the steps of: (1) 1000 g of starch is fed to a kneader, 150 g of sodium hydroxide, 250 mL of ethanol, and 50 mL of water are added to the kneader, and the kneading reaction proceeds for 60 minutes in a closed environment with the temperature of 25 °C; (2) 170 g of sodium hydroxide, 450 g of chloroacetic acid, and 250 mL of ethanol are added to the product obtained in step (1), the temperature thereof is raised to 50 °C, and the kneading reaction proceeds for 180 minutes in a closed environment with such temperature; (3) the product obtained in step (2) is cooled, 100 g of sodium carbonate is added to the product, and the kneading reaction proceeds for 60 minutes in a closed environment with the temperature of 25 °C. (4) 350 mL of ethanol, and 180 g of benzoyl chloride are added to the product obtained in step (3), the temperature thereof is raised to 40 °C, and the kneading reaction proceeds for 90 minutes in a closed environment with such temperature; (5) 900 g of nano-calcium carbonate (an oil absorption value thereof is 40 ml/100g, and a particle size thereof is 60 nm) is added to the product obtained in step (4), and the kneading reaction proceeds for 60 minutes in a closed environment with the temperature of 40 °C; and (6) stop stirring, the temperature thereof drops to room temperature, and the material in the kneader is discharged after another 4 hours, washed 4 times by ethanol, dried in vacuum with the temperature of 60 °C for 24 hours, and crushed to obtain said high temperature resisting temporary plugging agent with self deplugging for water-based drilling fluid.
The high temperature resisting temporary plugging agent with self deplugging for water-based drilling fluid manufactured by the method of the present example comprises hydrophobic modifying starch obtained by reaction of 1000 g of starch, 320 g of sodium hydroxide, 450 g of chloroacetic acid, 100 g of sodium carbonate, 180 g of benzoyl chloride serving as hydrophobic modifier, 850 mL of ethanol and 50 mL of water, and 900 g of nano-calcium carbonate.
Example 3
The preparing method for high temperature resisting temporary plugging agent with self deplugging for water-based drilling fluid according to the present disclosure comprises the steps of: (1) 1000 g of starch is fed to a kneader, 150 g of sodium hydroxide, 300 mL of isoisopropanol, and 150 mL of water are added to the kneader, and the kneading reaction proceeds for 80 minutes in a closed environment with the temperature of 30 °C; (2) 200 g of sodium hydroxide, 500 g of chloroacetic acid, and 300 mL of isopropanol are added to the product obtained in step (1), the temperature thereof is raised to 60 °C, and the kneading reaction proceeds for 150 minutes in a closed environment with such temperature; (3) the product obtained in step (2) is cooled, 150 g of sodium carbonate is added to the product, and the kneading reaction proceeds for 80 minutes in a closed environment with the temperature of 30 °C; (4) 400 mL of isopropanol, and 250 g of sodium phenylacetate are added to the product obtained in step (3), the temperature thereof is raised to 50 °C, and the kneading reaction proceeds for 120 minutes in a closed environment with such temperature; (5) 1200 g of nano-calcium carbonate (an oil absorption value thereof is 35 ml/100g, and a particle size thereof is 50 nm) is added to the product obtained in step (4), and the kneading reaction proceeds for 80 minutes in a closed environment with the temperature of 50 °C; and (6) stop stirring, the temperature thereof drops to room temperature, and the material in the kneader is discharged after another 6 hours, washed 5 times by petroleum ether, dried in vacuum with the temperature of 70 °C for 24 hours, and crushed to obtain said high temperature resisting temporary plugging agent with self deplugging for water-based drilling fluid.
The high temperature resisting temporary plugging agent with self deplugging for water-based drilling fluid manufactured by the method of the present example comprises hydrophobic modifying starch obtained by reaction of 1000 g of starch, 350 g of sodium hydroxide, 500 g of chloroacetic acid, 150 g of sodium carbonate, 250 g of sodium phenylacetate serving as hydrophobic modifier, 1000 mL of isopropanol and 150 mL of water, and 1200 g of nano-calcium carbonate.
Example 4
The performance evaluation of the high temperature resisting temporary plugging agent with self deplugging for water-based drilling fluid of the present disclosure is as follows.
The performance of the high temperature resisting temporary plugging agent with self deplugging is measured based on the basic formula of water-based drilling fluid commonly used onsite.
The experimental mud is formulated in the following way: 5 wt% of bentonite slurry, 0.3 wt% of sodium carbonate, 0.2 wt% of sodium hydroxide, 0.1 wt% of dry powder of polyacrylamide, 0.3 wt% of modified ammonium salt, 0.3 wt% of carboxymethylcellulose sodium of low viscosity, 0.2 wt% of polyacrylamide potash, 3 wt% of polymeric alcohol, 2 wt% of filtration control additive with high temperature resistance, anti-salt and anti-collapse, and 3 wt% of sulfonated phenolic resin (SMP-2). The experimental mud is added with 3.0 wt% high temperature resisting temporary plugging agents with self deplugging of examples 1-3 respectively, rolled for 16 hours in a rolling oven under different temperatures, after that cooled to the room temperature. The performance of which is measured, and the influence of high temperature resisting temporary plugging agents with self deplugging on water-based drilling fluid is researched. The result of which is shown in Table 1.
Table 1 The influence of high temperature resisting temporary plugging agents with self deplugging on water-based drilling fluid
The specific measuring method is shown in GB/T 16783.1-2006, wherein AV represents apparent viscosity, PV represents plastic viscosity, YP represents yield point, Gel represents gel strength, and FL represents filtration loss under normal temperature and normal pressure.
It can be seen from Table 1 that, the temporary plugging agent of the present disclosure can play the role of reducing filtration loss in the water-based drilling fluid system. The apparent viscosity, yield point, and gel strength of the drilling fluid, after being added with the temporary plugging agent, do not change largely, which indicates that the temporary plugging agent has good compatibility with various treatment agents of original system, and would not have a great impact on operation onsite.
In addition, as shown in Table 1, the apparent viscosity, plastic viscosity, yield point, and gel strength of the drilling fluid 1, which is not added with the temporary plugging agent of the present disclosure, drop significantly with the rising of temperature. However, the viscosities of the drilling fluids 2-4, which are added with the temporary plugging agents of examples 1-3 respectively, rise continuously with the rising of temperature. This is because the hydrophobic modifying starch continues to swell and expand with the rising of temperature, and the exposure of hydrophobic sites enhances the hydrophobic association of hydrophobic sites of nanocalcium carbonate and various treatment agents, whereby the overall viscosity of the drilling fluid system increases. The viscosity of which drops when the temperature exceeds 140 °C, the performance of the mud cake formed thereof becomes poor, and the filtration loss increases significantly, which indicate that the high temperature resistance of the temporary plugging agent is 140°C.
It can be seen from the above analysis that the temporary plugging agent of the present disclosure has good high temperature resistance. This is because, on one hand, carboxymethyl groups are introduced through etherification reaction, and on the other hand, more hydrophobic sites are provided by nano-calcium carbonate, the hydrophobic association of the system is enhanced, and the temporary plugging agent has better high temperature resistance compared with a single polymer.
The temporary plugging effect and the reservoir protection effect of the temporary plugging agent are evaluated through core flooding experiments, and the JHMD- Π assessment system for dynamic core damage under high temperature and high pressure is used. Three cores of artificial sandstone, i.e., high permeability, medium permeability, and low permeability, are used respectively in the experiments (the vapor permeability of high permeability cores ranges from 1035.22 to 1067.11 mD (milli-darcy), and the porosity of which ranges from 13.9% to 16.5%; the vapor permeability of medium permeability cores ranges from 216.07 to 239.33 mD, and the porosity of which ranges from 12.1% to 13.7%; and the vapor permeabihty of low permeability cores ranges from 51.38 to 59.16 mD, and the porosity of which ranges from 9.1% to 9.7%. The length of all three cores ranges from 6.10 cm to 6.18 cm, and the diameter thereof ranges from 2.50 cm to 2.56 cm).
The results of the experiments are shown as follows:
Table 2 The core flooding experiment result of high permeability cores
Table 3 The core flooding experiment result of medium permeability cores
Table 4 The core flooding experiment result of low permeability cores
It can be seen from Table 2 to Table 4 that the high temperature resisting temporary plugging agent with self deplugging of the present disclosure has good temporary plugging effect and reservoir protection effect. Both the temporary plugging rate and the recovery rate of permeability of oil of high permeability cores, medium permeability cores, and low permeabihty cores are over 90%. The higher the initial permeability is, the higher the temporary plugging rate is, and the lower the recovery rate of permeability would be. This is because the higher the permeability is, the higher the instantaneous filtration loss of the drilling fluid would be. Under such circumstances, some solid particles would be introduced in inevitably, which could deposit when move to relatively narrow pore throats in the pores of high permeabihty cores, thereby playing a certain role of plugging. The influence of temperature on the temporary plugging effect is low. The temporary plugging rate decreases slightly while the recovery rate of permeability increases slightly with the rising of temperature, and this is because the macromolecular structures of the composites expand gradually with the rising of temperature.
It can be seen from the results of the core flooding experiments that the temporary plugging agent has self deplugging ability. It is not necessary to cut a core with a certain thickness before testing the recovery rate of permeabihty of oil, while backflow and plugging removal can be realized by the oil flow channels formed by the dispersion effect of oil phase of the hydrophobic components in the mud cake. It can be seen from the experimental result that, the time of stable oil flow of each of the cores are all within 6 hours, and the recovery rate of permeabihty of oil thereof all can reach or surpass 90% within 3-6 hours, which indicate that the temporary plugging agent has good self deplugging performance. In general, the temporary plugging agent has remarkable reservoir protection effect. The aforesaid time of stable oil flow means the time when water is completely displaced by oil in core flooding experiments and both the volume of oil flow and the displacing pressure reach stable. The shorter the time of stable oil flow is, the faster the hydrophobic oil flow channels would be established during backflow and plugging removal process in subsequent process, and the better the self deplugging ability of the temporary plugging agent would be.
Claims (12)
- Claims1. A high temperature resisting temporary plugging agent with self deplugging for water-based drilling fluid, comprising products obtained by reaction of starch, alkali metal hydroxide, halogenated organic add, carbonate, hydrophobic modifier, alcohol and water, and nano-calcium carbonate.
- 2. The temporary plugging agent according to claim 1, comprising the products obtained by reaction of 1000 parts by mass of starch, 250-350 parts by mass of alkali metal hydroxide, 350-500 parts by mass of halogenated organic acid, 50-150 parts by mass of carbonate, 120-250 parts by mass of hydrophobic modifier, 600-1000 parts by volume of alcohol and 50-150 parts by volume of water, and 800-1200 parts by mass of nanocalcium carbonate, wherein the parts by mass in grams, and parts by volume in millihters.
- 3. The temporary plugging agent according to claim 1 or claim 2, wherein the products obtained by said reaction are starch granules with hydrophobic modifying functional groups.
- 4. The temporary plugging agent according to any one of claims 1 to 3, wherein said alkali metal hydroxide is at least one selected from a group consisting of lithium hydroxide, sodium hydroxide, and potassium hydroxide, and preferably, sodium hydroxide is selected.
- 5. The temporary plugging agent according to any one of claims 1 to 4, wherein said halogenated organic acid is at least one selected from a group consisting of fluorinated organic acid, chlorinated organic acid, brominated organic acid, and iodinated organic acid, and preferably, chloroacetic acid is selected.
- 6. The temporary plugging agent according to any one of claims 1 to 5, wherein said carbonate is selected from sodium carbonate and/or potassium carbonate, and preferably, sodium carbonate is selected.
- 7. The temporary plugging agent according to any one of claims 1 to 6, wherein said starch is waxy maize starch.
- 8. The temporary plugging agent according to any one of claims 1 to 7, wherein said hydrophobic modifier is at least one selected from a group consisting of benzoyl chloride, 4-methylbenzoyl chloride, 4-ethylbenzoyl chloride, terephthaloyl chloride, sodium benzoate, and sodium phenylacetate.
- 9. The temporary plugging agent according to any one of claims 1 to 8, wherein an oil absorption value of said nano-calcium carbonate is 25-40 ml/100g, and a particle size thereof is 40-60 nm.
- 10. The temporary plugging agent according to any one of claims 1 to 9, wherein said alcohol is at least one selected from a group consisting of ethanol, propanol, and isopropanol, and preferably, ethanol is selected.
- 11. A preparing method for said high temperature resisting temporary plugging agent with self deplugging for water-based drilling fluid according to any one of claims 1 to 10, comprising feeding said components with said proportion to a kneader, and kneading said components to obtain said high temperature resisting temporary plugging agent with self deplugging for water-based drilling fluid.
- 12. The method according to cl aim 11, comprising the steps of: 1) feeding starch to a kneader, adding a first part of said alkali metal hydroxide, a first part of said alcohol and water to said kneader, and performing kneading; 2) adding a second part of said alkali metal hydroxide, said halogenated organic acid, and a second part of said alcohol to a product obtained in step 1), and performing kneading; 3) adding carbonate to a product obtained in step 2), and performing kneading; 4) adding a third part of said alcohol and hydrophobic modifier to a product obtained in step 3), and performing kneading; and 5) adding nano-calcium carbonate to a product obtained in step 4), and performing kneading to obtain said high temperature resisting temporary plugging agent with self deplugging for water-based drilling fluid.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310693283 | 2013-12-17 | ||
| CN201310693283.8A CN104710967B (en) | 2013-12-17 | 2013-12-17 | A kind of water-base drilling fluid is with from de-plugging temperature resistance diverting agent and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NL2013995A NL2013995A (en) | 2015-06-18 |
| NL2013995B1 true NL2013995B1 (en) | 2016-06-21 |
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| CN108059952A (en) * | 2018-01-03 | 2018-05-22 | 中国石油天然气股份有限公司 | A kind of degradable shielding protection agent and its preparation method and application |
| CN109536145A (en) * | 2018-12-03 | 2019-03-29 | 中国石油集团川庆钻探工程有限公司 | A kind of water solubility pressure break diverting agent and its synthetic method |
| CN109666466A (en) * | 2019-01-28 | 2019-04-23 | 中国海洋石油集团有限公司 | A kind of low permeability reservoir environment-protection nano water-base drilling fluid and preparation method thereof |
| CN110079288A (en) * | 2019-06-04 | 2019-08-02 | 中国石油化工股份有限公司 | A kind of dilatancy diverting agent and preparation method thereof |
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| CN102199222A (en) * | 2010-03-26 | 2011-09-28 | 中国石油大学(北京) | Amphiphilic starch and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108059952A (en) * | 2018-01-03 | 2018-05-22 | 中国石油天然气股份有限公司 | A kind of degradable shielding protection agent and its preparation method and application |
| CN108059952B (en) * | 2018-01-03 | 2020-05-08 | 中国石油天然气股份有限公司 | Degradable shielding protective agent and preparation method and application thereof |
| CN109536145A (en) * | 2018-12-03 | 2019-03-29 | 中国石油集团川庆钻探工程有限公司 | A kind of water solubility pressure break diverting agent and its synthetic method |
| CN109666466A (en) * | 2019-01-28 | 2019-04-23 | 中国海洋石油集团有限公司 | A kind of low permeability reservoir environment-protection nano water-base drilling fluid and preparation method thereof |
| CN110079288A (en) * | 2019-06-04 | 2019-08-02 | 中国石油化工股份有限公司 | A kind of dilatancy diverting agent and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104710967A (en) | 2015-06-17 |
| CN104710967B (en) | 2019-01-01 |
| NL2013995A (en) | 2015-06-18 |
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