CN113403046B - Shrinkage-expansion agent for preventing borehole wall instability in oil production and drilling processes of high-argillaceous oil reservoirs and preparation method of shrinkage-expansion agent - Google Patents
Shrinkage-expansion agent for preventing borehole wall instability in oil production and drilling processes of high-argillaceous oil reservoirs and preparation method of shrinkage-expansion agent Download PDFInfo
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Abstract
The invention provides a shrinkage-expansion agent for preventing borehole wall instability in the oil extraction and drilling process of a high-argillaceous oil reservoir and a preparation method thereof, and relates to the technical field of drilling fluids. The shrinking and swelling agent is prepared from a quaternary ammonium salt, a calcium chloride solution and an acrylic acid solution, wherein the mass ratio of the quaternary ammonium salt to the calcium chloride to the acrylic acid is 1:2: and 2, wherein the quaternary ammonium salt consists of bimolecular quaternary ammonium salt and a long-chain quaternary ammonium salt polymer, the bimolecular quaternary ammonium salt is synthesized by N, N-dimethyl dodecyl tertiary amine and 1, 3-dibromopropane in an ethanol solution, and the quaternary ammonium salt long-chain polymer is synthesized by N, N-dimethyl dodecyl tertiary amine and epichlorohydrin in the ethanol solution by taking azodiisobutyronitrile as an initiator. The swelling and shrinking agent prepared by the invention has good water solubility, can firmly adsorb clay particles, has obvious swelling and shrinking effect, can reach more than 40% when the mass fraction is 2%, effectively solves various problems caused by the expansion of the shale, makes up the vacancy of high-efficiency swelling and shrinking agent in domestic market, and is beneficial to the development of oil extraction industry.
Description
Technical Field
The invention relates to the technical field of drilling fluid, in particular to a shrinkage-expansion agent for preventing borehole wall instability in the oil extraction and drilling process of a high-argillaceous oil reservoir and a preparation method thereof.
Background
In the oil production drilling process, drilling fluid must be injected into a well in order to carry, suspend drill cuttings and lubricate and protect a drill bit, and because the underground formation environment is very complex, the injection of the drilling fluid can cause a series of problems of well wall instability. And as the drilling depth deepens, the borehole wall instability can cause a series of problems, and safety accidents can be caused besides the great reduction of the production efficiency. By analyzing the borehole wall instability, the borehole wall instability is generally considered to be caused by the hydration expansion of the shale.
The currently adopted swelling shrinkage agent is a new generation of shale inhibitor, and compared with a conventional clay stabilizer, the swelling shrinkage agent has better expansibility, and also has certain sand inhibition and swelling shrinkage effects, so that the acidification and blockage removal of a water injection well are facilitated to be improved, and the anti-swelling effective period of a drilling well is greatly shortened. The expansion shrinkage agent can recover the permeability of an oil and gas reservoir to a certain extent by reducing the volume of the expanded clay as the name implies, so that the water injection pressure is reduced, and the oil recovery rate is improved.
The research shows that the shrinkage-swelling mechanism of the shrinkage-swelling agent on the montmorillonite is generally four:
(1) A compressed double layer mechanism; through cation in the swelling shrinking agent and negative charge on the surface of montmorillonite crystal, zeta potential is reduced, and double electric layers are compressed, thereby macroscopically shrinking the volume of clay. (2) water molecule removal mechanism; the strong oxidizing substance carried in the swelling shrinking agent acts on the clay crystal to remove water molecules adsorbed in the montmorillonite crystal, shrink the volume of the clay and restore the permeability of the reservoir. (3) an ion exchange mechanism; each kind of cation has different hydration energy, the swelling of the montmorillonite crystal is caused by the ion with larger hydration energy, the particle with larger hydration energy can absorb more water molecules, so the low hydration energy cation carried in the swelling shrinking agent can be utilized to replace the ion with high hydration energy, thereby reducing the volume of the montmorillonite crystal, and the cation can also play the role of preventing swelling when being absorbed on the crystal surface. (4) a multi-point adsorption mechanism; the long-chain swelling and shrinking agent molecules are adopted, the bridging effect of the swelling and shrinking agent molecules is exerted through multi-point adsorption, and dispersed clay crystals are adsorbed together, so that the dispersion and the transportation of a part of the clay crystals are prevented, and the aims of improving the permeability of an oil and gas reservoir and improving the oil extraction efficiency are finally fulfilled.
For example, patent document CN 107338036A proposes "a shrinkage-swelling type solidless workover fluid and a preparation method thereof", which is prepared by compounding potassium chloride, sodium sulfite, cationic quaternary ammonium salt, a nonionic surfactant, a silicone surface, polysorbate and xanthan gum according to a certain ratio, and can greatly improve the effective permeability of the fluid in an experimental well, and the shrinkage-swelling rate is up to 82% measured in a laboratory. However, the preparation process of the shrinkage-expansion type solid-free workover fluid in the patent is complex, the flow is complicated, and the shrinkage-expansion type solid-free workover fluid is not suitable for large-scale production.
In addition, patent document CN 111607375A proposes "an anti-swelling and anti-swelling agent for low permeability sensitive oil reservoir and a preparation method thereof", which is prepared by polymerizing methacryloyloxyethyl trimethyl ammonium chloride and 3-allyloxy-2-hydroxy-1-propanesulfonic acid, wherein the anti-swelling rate can reach more than 98% and the swelling shrinkage rate is 40% at a concentration of 500 ppm. However, the swelling agent synthesized by the method disclosed by the patent has the problems of too large molecular weight, poor control of polymerization degree, complicated reaction process and deviation of water solubility, and the process of preparing the drilling fluid is time-consuming and is not beneficial to actual field construction.
Disclosure of Invention
Aiming at the phenomenon of borehole wall instability in the oil extraction and drilling process of the high-argillaceous oil reservoir, the invention provides the shrinkage-expansion agent for preventing borehole wall instability in the oil extraction and drilling process of the high-argillaceous oil reservoir and the preparation method thereof, so that various problems caused by mud shale expansion are effectively solved, the vacancy of the high-efficiency shrinkage-expansion agent in the domestic market is made up, and the development of the oil extraction industry is facilitated.
The invention adopts the following technical scheme:
a shrinkage-expansion agent for preventing borehole wall instability in the oil production and drilling process of a high-argillaceous oil reservoir is prepared from a quaternary ammonium salt, a calcium chloride solution and an acrylic acid solution, wherein the calcium chloride solution and the acrylic acid solution play a role in synergistic shrinkage-expansion, and the quaternary ammonium salt consists of a bimolecular quaternary ammonium salt and a long-chain quaternary ammonium salt polymer; the bimolecular quaternary ammonium salt is synthesized by N, N dimethyl dodecyl tertiary amine and 1,3 dibromopropane in ethanol solution and utilizes NH with lower hydration energy 4 + High-hydration-energy cations in the clay crystal are replaced, water molecules absorbed in the crystal are released, and the effect of ion replacement is achieved; the quaternary ammonium salt long-chain polymer takes azobisisobutyronitrile as an initiator, and is prepared from N, N-dimethyl dodecyl tertiary amine and epoxy chloridePropane is synthesized in an ethanol solution to play a role in multi-point adsorption, and the clay particles dispersed in water are bridged to prevent the dispersion and the transportation of the clay particles;
the reaction equation is:
preferably, the mass ratio of the quaternary ammonium salt, the calcium chloride and the acrylic acid in the swelling shrinking agent is 1: (1.9-2.1): (1.9-2.1) and the total mass fraction is 2-4%.
Preferably, the mass ratio of the quaternary ammonium salt, the calcium chloride and the acrylic acid in the swelling shrinking agent is 1:2:2, the total mass fraction is 2%.
Preferably, the mass fraction of the initiator azobisisobutyronitrile is 0.2-0.4%, and the molar ratio of 1, 3-dibromopropane to epichlorohydrin is (3.5-4.5): 1.
preferably, the mass fraction of the ethanol solution is 60%, the mass fraction of the initiator azobisisobutyronitrile is 0.2%, and the molar ratio of the 1, 3-dibromopropane to the epichlorohydrin is 4:1.
the preparation method of the shrinkage-expansion agent for preventing the borehole wall instability in the oil extraction and drilling process of the high-argillaceous oil reservoir comprises the following steps:
a. sequentially adding an ethanol solution and N, N-dimethyl dodecyl tertiary amine into a three-neck flask to obtain an amine solution, stirring the amine solution, raising the temperature of a system to 55-65 ℃ of a preheating temperature, slowly dripping 1, 3-dibromopropane into the system at a dripping speed of 0.5-1 ml/min, after the dripping of the 1, 3-dibromopropane is finished, raising the temperature of the system to 75-80 ℃ of a reaction temperature for quaternization, and preparing a bimolecular quaternary ammonium salt compound;
b. reducing the temperature of the system to 55-65 ℃ of preheating temperature, adding initiator azobisisobutyronitrile and epoxy chloropropane into a three-neck flask, then increasing the temperature of the system to 80-85 ℃ of reaction temperature for ring-opening addition polymerization, maintaining the temperature constant, after the reaction is finished, putting the three-neck flask into a vacuum oven, and drying the solvent in the system, wherein the shrinkage-expansion agent is used for preventing the instability of a well wall in the oil extraction and drilling process of a high-argillaceous oil reservoir.
Preferably, in the step a, the time length of the quaternization reaction is 10 to 12 hours.
Preferably, the ring-opening addition polymerization reaction time in the step b is 6 to 8 hours.
Preferably, in the step b, the temperature of the vacuum oven is 60 ℃, and the drying time is 5-7 h.
The invention has the beneficial effects that:
(1) the shrinking and swelling agent provided by the invention adopts bimolecular quaternary ammonium salt cations, and the efficiency of ion exchange is greatly improved by utilizing high-density cations, so that the shrinking and swelling efficiency of clay is improved.
(2) The swelling and shrinking agent provided by the invention has good water solubility, is convenient to construct on site, greatly improves the working efficiency, has low raw material cost and simple synthesis process, and is suitable for large-scale production.
(3) The shrinking and swelling agent provided by the invention can be firmly adsorbed on the surface of clay mineral, the action time is long, the effect is stable, and when the mass fraction of the shrinking and swelling agent is 2%, the shrinking and swelling rate can reach more than 40%.
Drawings
FIG. 1 is an infrared spectrum of bimolecular quaternary ammonium salt in the swelling shrinking agent.
FIG. 2 is an infrared spectrum of a quaternary ammonium salt long-chain polymer in the swelling shrinking agent.
Detailed Description
The invention is described in detail below with reference to the following figures and examples:
the shrinkage-expansion agent for preventing the borehole wall instability in the oil extraction and drilling process of the high-argillaceous oil reservoir is prepared from 2 mass percent of calcium chloride solution, 3 mass percent of acrylic acid solution and 1 mass ratio of quaternary ammonium salt, calcium chloride and acrylic acid: (1.9-2.1): (1.9-2.1) and the total mass fraction is 2% -4%, wherein the quaternary ammonium salt consists of bimolecular quaternary ammonium salt and long-chain quaternary ammonium salt polymer, the bimolecular quaternary ammonium salt is synthesized by N, N dimethyl dodecyl tertiary amine and 1,3 dibromopropane in ethanol solution, and an infrared spectrogram of the bimolecular quaternary ammonium salt is shown in figure 1; the quaternary ammonium salt long-chain polymer is synthesized by taking azobisisobutyronitrile with the mass fraction of 0.2-0.4% as an initiator in an ethanol solution from N, N dimethyl dodecyl tertiary amine and epichlorohydrin, wherein the molar ratio of 1, 3-dibromopropane to epichlorohydrin is (3.5-4.5): 1, an infrared spectrogram of the quaternary ammonium salt long-chain polymer is shown in figure 2, and the mass fraction of ethanol solution adopted in the preparation process is 60%.
The preparation method of the shrinkage-expansion agent for preventing the borehole wall instability in the oil extraction and drilling process of the high-argillaceous oil reservoir comprises the following steps:
a. adding an ethanol solution and N, N-dimethyl dodecyl tertiary amine into a three-neck flask in sequence to obtain an amine solution, stirring the amine solution, raising the temperature of the system to 55-65 ℃ of preheating temperature, slowly dripping 1, 3-dibromopropane into the system at a dripping speed of 0.5-1 ml/min, after the dripping of the 1, 3-dibromopropane is finished, raising the temperature of the system to 75-80 ℃ of reaction temperature for quaternization reaction for 10-12 h, and preparing the bimolecular quaternary ammonium salt compound.
b. Reducing the temperature of the system to 55-65 ℃ of preheating temperature, adding initiators of azodiisobutyronitrile and epichlorohydrin into a three-neck flask, raising the temperature of the system to 80-85 ℃ of reaction temperature, carrying out ring-opening addition polymerization reaction for 6-8 hours, keeping the temperature constant, after the reaction is finished, putting the three-neck flask into a vacuum oven at 60 ℃ for drying for 5-7 hours, and drying a solvent in the system to obtain the shrinkage-expansion agent for preventing borehole wall instability in the oil extraction and drilling process of the high-argillaceous oil deposit.
Example 1
The shrinking and swelling agent is prepared from a quaternary ammonium salt, a calcium chloride solution and an acrylic acid solution, wherein the mass fraction of the calcium chloride solution is 2%, the mass fraction of the acrylic acid solution is 3%, and the mass ratio of the quaternary ammonium salt to the calcium chloride to the acrylic acid is 1:1.9:1.9, wherein the quaternary ammonium salt consists of a bimolecular quaternary ammonium salt and a long-chain quaternary ammonium salt polymer, the bimolecular quaternary ammonium salt is synthesized by N, N-dimethyl dodecyl tertiary amine and 1, 3-dibromopropane in an ethanol solution, the quaternary ammonium salt long-chain polymer is synthesized by N, N-dimethyl dodecyl tertiary amine and epichlorohydrin in the ethanol solution by taking azobisisobutyronitrile with the mass fraction of 0.2% as an initiator, and the molar ratio of the 1, 3-dibromopropane to the epichlorohydrin is 3.5:1, the mass fraction of the ethanol solution is 60 percent.
The preparation method of the swelling shrinking agent comprises the following steps:
a. adding an ethanol solution and N, N-dimethyl dodecyl tertiary amine into a three-neck flask in sequence to obtain an amine solution, stirring the amine solution by using a magnetic stirrer, heating the system to 55 ℃ of a preheating temperature, slowly dripping 1, 3-dibromopropane into the system at a dripping speed of 0.5-1 ml/min, heating the system to 75 ℃ of a reaction temperature after the dripping of the 1, 3-dibromopropane is finished, and carrying out quaternization for 10 hours to prepare the bimolecular quaternary ammonium salt compound.
b. Reducing the temperature of the system to 55 ℃ of preheating temperature, adding initiators of azodiisobutyronitrile and epichlorohydrin into a three-neck flask, increasing the temperature of the system to 80 ℃ of reaction temperature for 6 hours of ring-opening addition polymerization reaction, maintaining the temperature constant, and after the reaction is finished, putting the three-neck flask into a vacuum oven at 60 ℃ for drying for 5 hours to obtain the shrinkage-expansion agent for preventing the instability of the well wall in the oil extraction and drilling process of the high-argillaceous oil reservoir.
Example 2
The shrinking and swelling agent is prepared from a quaternary ammonium salt, a calcium chloride solution and an acrylic acid solution, wherein the mass fraction of the calcium chloride solution is 2%, the mass fraction of the acrylic acid solution is 3%, and the mass ratio of the quaternary ammonium salt to the calcium chloride to the acrylic acid is 1:2: and 2, the total mass fraction is 3%, wherein the quaternary ammonium salt consists of bimolecular quaternary ammonium salt and long-chain quaternary ammonium salt polymer, the bimolecular quaternary ammonium salt is synthesized by N, N-dimethyl dodecyl tertiary amine and 1, 3-dibromopropane in an ethanol solution, the quaternary ammonium salt long-chain polymer is synthesized by N, N-dimethyl dodecyl tertiary amine and epoxy chloropropane in an ethanol solution by taking azobisisobutyronitrile with the mass fraction of 0.3% as an initiator, and the molar ratio of the 1, 3-dibromopropane to the epoxy chloropropane is 4:1, the mass fraction of the ethanol solution is 60 percent.
The preparation method of the swelling agent comprises the following steps:
a. adding an ethanol solution and N, N-dimethyl dodecyl tertiary amine into a three-neck flask in sequence to obtain an amine solution, stirring the amine solution by using a magnetic stirrer, raising the temperature of a system to a preheating temperature of 60 ℃, slowly dripping 1, 3-dibromopropane into the system at a dripping speed of 0.5-1 ml/min, after the dripping of the 1, 3-dibromopropane is completed, raising the temperature of the system to a reaction temperature of 75 ℃ for quaternization reaction for 11 hours, and preparing the bimolecular quaternary ammonium salt compound.
b. Reducing the temperature of the system to 60 ℃ of preheating temperature, adding initiators of azodiisobutyronitrile and epichlorohydrin into a three-neck flask, then increasing the temperature of the system to 85 ℃ of reaction temperature for 7 hours of ring-opening addition polymerization reaction, maintaining the temperature constant, and after the reaction is finished, putting the three-neck flask into a vacuum oven at 60 ℃ for drying for 6 hours to obtain the shrinkage-expansion agent for preventing the instability of the well wall in the oil extraction and drilling process of the high-argillaceous oil reservoir.
Example 3
The swelling shrinking agent is prepared from a quaternary ammonium salt, a calcium chloride solution and an acrylic acid solution, wherein the mass fraction of the calcium chloride solution is 2%, the mass fraction of the acrylic acid solution is 3%, and the mass ratio of the quaternary ammonium salt to the calcium chloride to the acrylic acid is 1:2.1:2.1, the total mass fraction is 4%, wherein the quaternary ammonium salt consists of bimolecular quaternary ammonium salt and long-chain quaternary ammonium salt polymer, the bimolecular quaternary ammonium salt is synthesized by N, N-dimethyl dodecyl tertiary amine and 1, 3-dibromopropane in ethanol solution, the quaternary ammonium salt long-chain polymer is synthesized by N, N-dimethyl dodecyl tertiary amine and epichlorohydrin in ethanol solution by taking azobisisobutyronitrile with the mass fraction of 0.4% as an initiator, and the molar ratio of 1, 3-dibromopropane to epichlorohydrin is 4.5:1, the mass fraction of the ethanol solution is 60 percent.
The preparation method of the swelling shrinking agent comprises the following steps:
a. adding an ethanol solution and N, N-dimethyl dodecyl tertiary amine into a three-neck flask in sequence to obtain an amine solution, stirring the amine solution by using a magnetic stirrer, raising the temperature of a system to a preheating temperature of 65 ℃, slowly dripping 1, 3-dibromopropane into the system at a dripping speed of 0.5-1 ml/min, after the dripping of the 1, 3-dibromopropane is completed, raising the temperature of the system to a reaction temperature of 80 ℃ for quaternization reaction for 11 hours, and preparing the bimolecular quaternary ammonium salt compound.
b. Reducing the temperature of the system to 65 ℃ of preheating temperature, adding initiators of azodiisobutyronitrile and epichlorohydrin into a three-neck flask, increasing the temperature of the system to 80 ℃ of reaction temperature for ring-opening addition polymerization reaction for 8 hours, maintaining the temperature constant, and after the reaction is finished, putting the three-neck flask into a vacuum oven at 60 ℃ for drying for 7 hours to obtain the shrinkage-expansion agent for preventing the instability of the well wall in the oil extraction and drilling process of the high-argillaceous oil reservoir.
In order to further measure the performance of the swelling shrinkage agents prepared in examples 1 to 3, the swelling shrinkage agents were prepared for the respective examples, and the swelling shrinkage effect of the swelling shrinkage agents was measured by the following methods, respectively, comprising the steps of:
(1) Putting a proper amount of clay into a beaker, putting the beaker into a blast type constant temperature drying oven with the temperature of 105 ℃ for drying for 3 hours, respectively weighing 0.5g of dried clay, putting the dried clay into 10ml centrifuge tubes with the numbers 1 and 2, respectively adding equal amount of kerosene into the centrifuge tube with the number 1, respectively adding equal amount of water into the centrifuge tube with the number 2, respectively adding equal amount of kerosene and water, shaking uniformly, standing for 2 hours, and processing at 1500 r.min -1 Centrifuging for 15min at the speed of (1), and recording the liquid volume in the centrifuge tube as V 0 Number 2 liquid volume in centrifuge tube is V 1 。
(2) Pouring out water in the centrifuge tube with the number 2, adding a shrinking and swelling agent with a fixed mass fraction, shaking up slightly, standing for 2 hours at 1500 r.min -1 Is centrifuged for 15min, and the volume of the liquid in the centrifuge tube with the number 2 is recorded as V 2 And calculating the shrinkage-expansion rate of the shrinkage-expansion agent, wherein the formula is as follows:
wherein P represents an expansion ratio.
The shrinkage-expansion ratio of the swelling agent prepared in each example was experimentally measured, the clay before and after the treatment with the swelling agent of the present invention was observed under a microscope, the contact angles of the clay before and after the treatment were compared, and the shrinkage-expansion effect of the swelling agent was expressed by the shrinkage-expansion ratio, as shown in Table 1.
TABLE 1 the effect of the examples on the expansion and contraction of the expansion and contraction agent
The shrinkage-expansion rate of the shrinkage-expansion agent prepared by the invention is more than 40%, and the shrinkage-expansion rate of the shrinkage-expansion agent prepared in the embodiment 2 is 44.1% at most, so that the shrinkage-expansion agent is suitable for solving the problem of borehole wall instability of a high-argillaceous oil reservoir in drilling operation, effectively overcomes the defects that the existing clay stabilizer has poor effect and does not have the function of reducing expanded clay, and has important engineering application value.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (7)
1. A shrinkage-expansion agent for preventing borehole wall instability in the process of oil production and well drilling of a high-argillaceous oil reservoir is characterized in that the shrinkage-expansion agent is prepared from a quaternary ammonium salt, a calcium chloride solution and an acrylic acid solution, wherein the quaternary ammonium salt consists of a bimolecular quaternary ammonium salt and a long-chain quaternary ammonium salt polymer, the bimolecular quaternary ammonium salt is synthesized from N, N dimethyl dodecyl tertiary amine and 1,3 dibromopropane in an ethanol solution, and the quaternary ammonium salt long-chain polymer is synthesized from N, N dimethyl dodecyl tertiary amine and epoxy chloropropane in the ethanol solution by taking azodiisobutyronitrile as an initiator;
the mass ratio of the quaternary ammonium salt, the calcium chloride and the acrylic acid in the swelling shrinking agent is 1: (1.9-2.1): (1.9-2.1), the total mass fraction is 2% -4%;
the initiator azobisisobutyronitrile is 0.2-0.4% by mass, and the molar ratio of 1, 3-dibromopropane to epichlorohydrin is (3.5-4.5): 1.
2. the shrinkage-expansion agent for preventing borehole wall instability in the oil production and drilling process of the high-argillaceous oil reservoir according to claim 1, wherein the mass ratio of the quaternary ammonium salt, the calcium chloride and the acrylic acid in the shrinkage-expansion agent is 1:2:2, the total mass fraction is 2%.
3. The shrinkage-swelling agent for preventing borehole wall instability during oil production and drilling of a high-shale oil reservoir according to claim 2, characterized in that the mass fraction of the ethanol solution is 60%, the mass fraction of the initiator azobisisobutyronitrile is 0.2%, and the molar ratio of 1, 3-dibromopropane to epichlorohydrin is 4:1.
4. the preparation method of the swelling shrinking agent for preventing the borehole wall instability in the oil production and drilling process of the high-argillaceous oil deposit according to any one of claims 1 to 3, characterized by comprising the following steps:
a. sequentially adding an ethanol solution and N, N-dimethyl dodecyl tertiary amine into a three-neck flask to obtain an amine solution, stirring the amine solution, raising the temperature of a system to 55-65 ℃ of a preheating temperature, slowly dripping 1, 3-dibromopropane into the system at a dripping speed of 0.5-1 ml/min, after the dripping of the 1, 3-dibromopropane is finished, raising the temperature of the system to 75-80 ℃ of a reaction temperature for quaternization, and preparing a bimolecular quaternary ammonium salt compound;
b. reducing the temperature of the system to 55-65 ℃ of preheating temperature, adding initiators of azodiisobutyronitrile and epichlorohydrin into the three-neck flask, raising the temperature of the system to 80-85 ℃ of reaction temperature for ring-opening addition polymerization reaction, maintaining the temperature constant, and after the reaction is finished, putting the three-neck flask into a vacuum oven for drying to obtain the shrinkage-expansion agent for preventing borehole wall instability in the oil extraction and drilling process of the high-argillaceous oil reservoir.
5. The preparation method of the swelling shrinking agent for preventing the borehole wall instability in the oil production and drilling process of the high-argillaceous oil deposit according to claim 4, wherein in the step a, the quaternization reaction time is 10-12 h.
6. The preparation method of the expansion reducing agent for preventing the borehole wall instability in the oil production and drilling process of the high-argillaceous oil deposit according to claim 4, wherein in the step b, the time of the ring-opening addition polymerization reaction is 6-8 h.
7. The preparation method of the shrinkage-expansion agent for preventing the borehole wall instability in the oil extraction and drilling process of the high-argillaceous oil reservoir according to claim 5 or 6, characterized in that in the step b, the temperature of the vacuum oven is 60 ℃, and the drying time is 5-7 h.
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Citations (4)
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