CN117164754A - Secondary cross-linked cucurbituril hybrid polymer gel system for preventing channeling of tight oil reservoir - Google Patents

Abstract

The invention belongs to the technical field of petroleum exploitation, relates to a secondary cross-linked polymer gel system, and particularly relates to a secondary cross-linked cucurbituril hybrid polymer gel system for preventing channeling of a tight oil reservoir. Wherein the cucurbituril hybrid polymer comprises the following preparation raw materials: acrylamide, cucurbit acrylate, N-vinylimidazole, 2-acrylamido-dodecylsulfonic acid. The cucurbituril hybrid polymer can be prepared into polymer gel, and the polymer gel has a good filtration reducing effect and can slow down the damage of filtration liquid to a matrix; and then the primary weakly crosslinked gel enters the deep part of the oil reservoir, slowly forms the secondary crosslinked gel, and keeps good stability under the high-temperature and high-salt condition.

Description

Secondary cross-linked cucurbituril hybrid polymer gel system for preventing channeling of tight oil reservoir

Technical Field

The invention belongs to the technical field of petroleum exploitation, relates to a secondary cross-linked polymer gel system, and particularly relates to a secondary cross-linked cucurbituril hybrid polymer gel system for preventing channeling of a tight oil reservoir.

Background

The dense oil is largely concentrated near the source rock and is less affected by the formation than conventional crude oil. Although the recoverable reserves of the tight oil are large, the permeability of the tight oil deposit is low (0.01 mD-0.1 mD), the pore structure is complex, the connectivity of pore throats is poor, and the exploitation difficulty is high due to strong micro-heterogeneity.

The horizontal well volume fracturing is an effective means for developing a tight oil reservoir, but after the tight oil reservoir is hydraulically fractured, the place for enriching crude oil is intricate and complex, and the matrix permeability is far smaller than the fracture permeability, so that when the recovery ratio is further improved later, no matter water flooding or gas flooding, the injected medium is easy to generate cross flow along the fracture, and the sweep efficiency is low. In order to prevent injected medium from flowing in a cross way, maintain stratum energy and ensure larger production pressure difference, a cross flow channel needs to be regulated and controlled, so that the injected medium is diverted into a matrix with high oil saturation, the swept volume is increased, and the displacement efficiency is improved.

The conventional crack channeling prevention system is polymer gel, and the base fluid of the system consists of a high molecular polymer, a cross-linking agent and other additives. The cross-linking agent connects together a plurality of polymer molecules by chemical reactions or physical effects including electrostatic effects, van der Waals forces, etc., which ultimately form a three-dimensional network structure at reservoir conditions that retains the "liquid-like" character on a molecular scale, macroscopically resembling a solid. Due to the trans-scale nature of the crack permeability and the adjacent matrix permeability, during injection, some low molecular cross-linking agents and additives impregnate the matrix from the crack, resulting in matrix contamination, unstable gel properties in the crack, and poor channeling prevention.

In the prior art, although the polymer gel technology exists, the polymer gel technology cannot meet the anti-channeling requirement of a tight oil reservoir. For example, chinese patent application CN201110312551.8 discloses a high-mineralization polymer gel and its preparation method, the preparation method of the high-mineralization polymer gel comprises uniformly dispersing dry powder of partially hydrolyzed polyacrylamide HPAM into solvent water, stirring for 2 hours, the mass concentration of partially hydrolyzed polyacrylamide is 0.05% -0.50%, mixing organic chromium as cross-linking agent with polymer solution, stirring uniformly, and Cr ³⁺ The mass concentration to polymer mass concentration ratio is poly: cr (Cr) ³⁺ "=180: 1, the total mineralization degree of the solvent water is 30g/l to 180g/l, wherein Ca ²⁺ And Mg (magnesium) ²⁺ The ion concentration range is 0.01% -1.00%, the gel is formed for 15 min-30 min under the condition of the oil reservoir temperature or 25 ℃ -85 ℃, and then the mixed solution is injected into stratum or rock core.

Chinese patent application CN201811358571.7 discloses a middle-low temperature gelling high temperature resistant polymer gel, and preparation method and application thereof, wherein the middle-low temperature gelling high temperature resistant polymer gel is prepared from the following raw materials: acrylamide-2-acrylamido-2-methylpropanesulfonic acid-vinylpyrrolidone terpolymer, a heat stabilizer, a cross-linking agent, resorcinol, urotropine and water; wherein the heat stabilizer is thiourea and cobalt chloride; the cross-linking agent is chromium acetate or zirconium acetate; the gel strength reaches G grade above at medium and low temperature, can be stabilized for 90 days at 140 ℃ and above, meets the plugging operation requirement of the medium and low temperature oil reservoir steam flooding, has good application prospect in the plugging of the high permeability layer of the medium and low temperature heavy oil reservoir steam flooding, and can remarkably improve the crude oil recovery ratio.

The invention aims to provide a secondary cross-linked cucurbituril hybrid polymer gel system, which aims at the problems of filtration, easy pollution of matrix by the filtration liquid and unstable gel performance existing in the conventional in-situ polymer gel mother liquid injection process in a dense oil reservoir. When the system is used for preparing liquid on the ground, a primary weak crosslinking three-dimensional network structure is formed through physical-chemical double crosslinking, and after the system is pumped into a stratum, the filtration can be effectively reduced, and the damage of the filtration liquid to a matrix is slowed down; then the primary weakly crosslinked gel enters the deep part of the oil reservoir to slowly form the secondary crosslinked gel, and the rigid cucurbituril, the vinyl imidazole and the temperature-resistant and salt-resistant monomer 2-acrylamide-dodecyl sulfonic acid are introduced, so that the high-stability can be kept under the high-temperature and high-salt condition.

Disclosure of Invention

In order to solve the technical problems, the invention provides a secondary cross-linked cucurbituril hybrid polymer gel which has a good filtration reducing effect and can slow down the damage of filtration liquid to a matrix; and then the primary weakly crosslinked gel enters the deep part of the oil reservoir, slowly forms the secondary crosslinked gel, and keeps good stability under the high-temperature and high-salt condition.

In order to achieve the above object, the technical scheme provided by the invention is as follows:

a cucurbituril hybrid polymer comprises the following preparation raw materials: acrylamide, cucurbit acrylate, N-vinylimidazole, 2-acrylamido-dodecylsulfonic acid.

Preferably, the cucurbituril hybrid polymer comprises the following preparation raw materials in parts by mole: 0.25-0.45 part of acrylamide, 0.01-0.05 part of acrylic acid cucurbit ester, 0.05-0.1 part of N-vinylimidazole and 0.05-0.1 part of 2-acrylamide-dodecyl sulfonic acid.

Preferably, the viscosity average molecular weight of the cucurbituril hybrid polymer is 300 ten thousand to 1000 ten thousand, the solid content is 95%, the number of glycoluril structural units in cucurbituril is 5,6,7 and 8, and the structure of the cucurbituril hybrid polymer is shown as follows:

wherein x, y, m, n is the degree of polymerization of the monomer, x: y: m: n=0.25 to 0.45:0.01 to 0.05:0.05 to 0.1:0.05 to 0.1.

The invention also aims to provide a preparation method of the cucurbituril hybrid polymer, which comprises the following steps:

(1) Adding acrylamide, acrylic acid cucurbit ester, N-vinyl imidazole and 2-acrylamide-dodecyl sulfonic acid into deionized water according to a molar ratio to obtain a monomer solution;

(2) And adding an initiator, and reacting to obtain the cucurbituril hybrid polymer.

Preferably, in the step (1), the total mass concentration of the acrylamide, the acrylic acid cucurbit ester, the N-vinyl imidazole and the 2-acrylamide-dodecyl sulfonic acid in the monomer solution is 20-30%.

Preferably, in (2), the initiator is azobisisobutylamidine hydrochloride.

Preferably, the initiator is used in an amount of 0.01 to 0.05% by mass of the total mass of acrylamide, cucurbituril acrylate, N-vinylimidazole and 2-acrylamido-dodecylsulfonic acid.

Preferably, in the step (2), inert gas is introduced after the initiator is added for 30-60min, wherein the inert gas is nitrogen or helium.

Preferably, in (2), the reaction is carried out under sealed conditions.

Preferably, the temperature of the reaction is 40-60 ℃ and the reaction time is 4-8h.

The invention also aims to provide application of the cucurbituril hybrid polymer in preparing a secondary cross-linked cucurbituril hybrid polymer gel.

The invention also aims to provide a secondary cross-linked cucurbituril hybrid polymer gel which comprises the following components: cucurbituril hybrid polymer, primary cross-linking agent, secondary cross-linking agent, activating agent and high temperature stabilizer.

Preferably, the crosslinked cucurbituril hybrid polymer gel comprises the following components in percentage by mass: 0.2-2% of cucurbituril hybrid polymer, 0.01-0.03% of primary cross-linking agent, 0.1-1% of secondary cross-linking agent, 0.05-0.2% of activating agent, 0.05-5% of high-temperature stabilizing agent and the balance of water.

Preferably, the crosslinked cucurbituril hybrid polymer gel comprises the following components in percentage by mass:

preferably, the primary crosslinking agent is any one or more of organic chromium, aluminum citrate, aluminum sulfate, resol, catechol, resorcinol, hexamethylenetetramine and oxalic acid modified rare earth chloride.

Preferably, the secondary crosslinking agent is any one or more of organic phenolic aldehyde, water-soluble polyethyleneimine, formaldehyde, paraformaldehyde, borax, nano zirconium diboride, alkali-catalyzed phenolic resin and chloropropene phenolic resin.

Preferably, the high temperature stabilizer is any one or more of nano sodium bentonite, polyethylene glycol, polyvinyl alcohol and PA fiber.

Preferably, the activator is any one or more of ammonium acetate, ammonium chloride, ammonium bicarbonate and citric acid.

The invention also aims to provide a preparation method of the secondary cross-linked cucurbituril hybrid polymer gel, which comprises the following steps:

s1, preparing cucurbituril hybrid polymer solution;

s2, diluting the cucurbituril hybrid polymer solution with water to a required concentration, adding a high-temperature stabilizer and an activator, and then sequentially adding a primary cross-linking agent and a secondary cross-linking agent to obtain the secondary cross-linked cucurbituril hybrid polymer gel.

The invention also aims to provide an application of the cucurbituril hybrid polymer or the secondary cross-linked cucurbituril hybrid polymer gel in gas migration prevention of a gas-driven tight oil reservoir.

Compared with the prior art, the invention has the technical advantages that:

(1) The invention provides a cucurbituril hybrid polymer which can be used for preparing a secondary cross-linked cucurbituril hybrid polymer gel, and the polymer gel solves the problems of large fluid loss, poor stability and weak deep migration capacity of a conventional polymer gel system.

Under the ground condition (15-35 ℃), the cucurbituril hybrid polymer firstly forms a physical cross-linked network structure through hydrophobic association and host-guest inclusion, then encrypts a three-dimensional network structure through chemical cross-linking with a primary cross-linking agent, has controllable chemical cross-linking time (1-5 h), has the viscosity of 20-500 mPa.s after primary gel forming, has good injection performance and small matrix injury (the matrix injury rate is less than 20%), and can be pushed along cracks; and then secondary crosslinking is carried out under the oil reservoir condition (35-120 ℃), the gel forming time is controllable (5-30 d), the formed secondary crosslinking gel strength is F-H, and the oil reservoir channeling-preventing requirement is met. The addition of the activating agent reduces the activation energy of the primary crosslinking agent at low temperature, and can perform primary crosslinking at lower temperature to form a weak crosslinked gel network. The addition of the high temperature stabilizer enhances the gel strength and simultaneously endows the gel system with high temperature (120 ℃) and high salt (20 multiplied by 10) ⁴ mg/L) of the composition.

(2) The cucurbituril hybrid polymer used in the invention is a supermolecular polymer, has small molecular weight and high dissolution speed in liquid preparation, and can be directly injected by using produced water. The rigid cucurbituril, vinyl imidazole and flexible water-soluble hydrophobic monomer 2-acrylamide dodecyl sulfonic acid are simultaneously introduced into a polymer molecular chain, so that the intermolecular hydrophobic association and host-guest inclusion of the supramolecular polymer are endowed, the polymer is endowed with good shearing resistance by a nonlinear structure, in addition, the rigid cucurbituril and vinyl imidazole can keep larger hydrodynamic size of the polymer under the conditions of high temperature and high salt, and finally good stability under the conditions of high temperature and high salt is kept.

(3) The gel system of the secondary cross-linked cucurbituril hybrid polymer provided by the invention is a secondary cross-linked system, is beneficial to reducing the damage to a matrix, and can be better applied to dense oil reservoir channeling prevention.

Detailed Description

The present invention will be described by way of specific examples, to facilitate understanding and grasping of the technical solution of the present invention, but the present invention is not limited thereto. The experimental methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials, unless otherwise specified, are commercially available; and the different sources have no significant effect on the product performance.

Example 1

A preparation method of cucurbituril hybrid polymer comprises the following steps:

(1) Acrylamide, cucurbit acrylate, N-vinylimidazole and 2-acrylamido-dodecyl sulfonic acid are mixed according to the mole ratio of 0.3:0.02:0.05: adding 0.08 into deionized water, and adding deionized water after the solution is clear and transparent to keep the total mass concentration of the monomers at 25%;

(2) Adding initiator azo diisobutyl amidine hydrochloride with the mass concentration of 0.01% under the stirring condition; introducing N ₂ Sealing the solution after 30 minutes, heating to 40 ℃ for reaction for 4 hours, and crushing, drying and granulating to obtain the cucurbituril hybrid polymer.

Example 2

A preparation method of cucurbituril hybrid polymer comprises the following steps:

(1) Acrylamide, cucurbit acrylate, N-vinylimidazole and 2-acrylamido-dodecyl sulfonic acid are mixed according to the mole ratio of 0.25:0.01:0.05: adding 0.05 into deionized water, and adding deionized water after the solution is clear and transparent to keep the total mass concentration of the monomers at 20%;

(2) Adding initiator azo diisobutyl amidine hydrochloride with the mass concentration of 0.05% under the stirring condition; introducing N ₂ Sealing the solution after 30 minutes, heating to 60 ℃ for reaction for 4 hours, and crushing, drying and granulating to obtain the cucurbituril hybrid polymer.

Example 3

A preparation method of cucurbituril hybrid polymer comprises the following steps:

(1) Acrylamide, cucurbit acrylate, N-vinylimidazole and 2-acrylamido-dodecyl sulfonic acid are mixed according to the mole ratio of 0.45:0.05:0.1:0.1 adding deionized water, and adding deionized water after the solution is clear and transparent to keep the total mass concentration of the monomers at 30%;

(2) Adding initiator azo diisobutyl amidine hydrochloride with the mass concentration of 0.01% under the stirring condition; introducing N ₂ Sealing the solution after 60 minutes, heating to 80 ℃ for reaction for 4 hours, and crushing, drying and granulating to obtain the cucurbituril hybrid polymer.

Example 4

The performance test comprises the following experimental steps:

(1) Preparing a polymer solution by adopting a mixing method, preparing the polymer solution with the maximum concentration according to the requirement of the experiment, and diluting the mother solution to the required concentration of the experiment when the polymer solution is used. Calculating the polymer dosage required by preparing a certain volume of polymer mother liquor, and placing the injected water of the corresponding application dosage under an electric stirrer, and stirring to generate vortex; slowly adding the weighed polymer powder into the injected water at a constant speed to avoid the formation of fish eyes by rapid addition; stirring at a moderate rotation speed until the polymer is fully swelled, and standing for 12h for later use;

(2) The base solution of the secondary crosslinking gel system is prepared according to the following proportion: 0.5 to 1.5 percent of cucurbituril hybrid polymer (the polymer is the polymer obtained in the example 1, the viscosity average molecular weight is 300 ten thousand, x: y: m: n=0.3: 0.02:0.05: 0.08) +0.02% of primary crosslinking agent resorcinol+0.5% of secondary crosslinking agent organic phenolic aldehyde+0.2% of activator ammonium acetate+5% of high temperature stabilizer nano sodium bentonite, and the balance of water;

(3) After preparation, the viscosity of the mother solution is tested at 15 ℃ and then kept stand for 2 hours, the viscosity of the primary crosslinking system is tested, then the mother solution is placed in an oven at 120 ℃, the gel strength is observed through a gel code method (refer to Tanxin. Low Wen Liyan oil reservoir secondary gel system and profile control performance evaluation research; southwest Petroleum university, 2018.) (Table 1), the experimental result is shown in Table 2, after standing for 2 hours at 15 ℃, the primary crosslinking reaction of the base solution is carried out to form a weak crosslinking network, the viscosity of the system is increased, dehydration (strength is not represented by dehydration) does not occur after aging for 60 days, and higher strength is maintained.

TABLE 1 gel strength code Standard

TABLE 2 gel Properties

Example 5

Matrix damage caused by gel filtration is researched through a fracture core displacement experiment, and the damage of a secondary crosslinked gel system and primary crosslinked gel is compared, wherein the experimental steps are as follows:

(1) After the matrix permeability (0.16 mD) of the core is tested, the core is subjected to joint making, and the crack is saturated with stratum water and is placed in a core holder;

(2) Injecting formation water into the rock core at a speed of 0.5mL/min, and testing the permeability of the fracture to be 3.4D;

(3) The core was injected with a secondary gel system after primary crosslinking (gel system with a concentration of 1.5% polymer in example 4) and a system without primary crosslinking agent at a rate of 0.5mL/min, the pressure change was recorded, and after the displacement pressure was stabilized, the core was taken out.

(4) And scraping quartz sand and gel in the crack of the core, adhering the crack wall surface, and then testing the matrix permeability (0.15 mD) of the core again to obtain the damage degree of the secondary crosslinked gel system to the matrix of 6.25%, wherein the matrix damage rate of the conventional gel system is 23.4%.

For visual testing of the fluid loss of the system, the fluid loss of a secondary gel system (the concentration of the polymer is 1.5%) after primary crosslinking and a system without adding a primary crosslinking agent are studied by using an FADLT-1 type fracturing and acidizing working fluid dynamic fluid loss instrument, and the initial fluid loss and the accumulated fluid loss for 2 hours are respectively 0.015m ³ /m ² ，1.5mL；0.05m ³ /m ² 3.6mL, the secondary crosslinking system can obviously reduce fluid loss, and has a certain protection effect on the matrix.

Example 6

The experimental procedure was as follows:

(1) Preparing a polymer solution by adopting a mixing method, preparing the polymer solution with the maximum concentration according to the requirement of the experiment, and diluting the mother solution to the required concentration of the experiment when the polymer solution is used. Calculating the polymer dosage required by preparing a certain volume of polymer mother liquor, and placing the injected water of the corresponding application dosage under an electric stirrer, and stirring to generate vortex; slowly adding the weighed polymer powder into the injected water at a constant speed to avoid the formation of fish eyes by rapid addition; stirring at a moderate rotation speed until the polymer is fully swelled, and standing for 12h for later use;

(2) The mother liquor of the secondary cross-linked gel system is prepared according to the following proportion: 0.1 to 0.3 percent of cucurbituril hybrid polymer (the polymer is the polymer obtained in the example 3, the viscosity average molecular weight is 800 ten thousand, x: y: m: n=0.45:0.05:0.1:0.1) +0.02 percent of primary cross-linking agent hexamethylenetetramine+0.5 percent of polyethylene glycol modified high ortho phenolic resin+0.1 percent of activator citric acid+2 percent of high temperature stabilizer polyvinyl alcohol, and the balance of water;

(3) After the preparation, the viscosity of the mother solution was measured at 20 ℃, followed by standing for 2 hours, the viscosity of the primary crosslinking system was measured, and then the primary crosslinking system was placed in an oven at 90 ℃, and the strength of the gel was observed by a gel code method, and the experimental results are shown in table 3. After standing for 2 hours at 20 ℃, the base solution undergoes a primary crosslinking reaction to form a weak crosslinking network, the viscosity of the system is increased, dehydration does not occur after aging for 60 days, and high strength is maintained.

TABLE 3 gel Properties

Example 7

Matrix damage caused by gel filtration is researched through a fracture core displacement experiment, and the damage of a secondary crosslinked gel system and primary crosslinked gel is compared, wherein the experimental steps are as follows:

(1) After the matrix permeability (0.18 mD) of the core is tested, the core is subjected to joint making, and the crack is saturated with stratum water and is placed in a core holder;

(2) Injecting formation water into the rock core at a speed of 0.5mL/min, and testing the permeability of the fracture to be 3.6D;

(3) The core was injected with a secondary gel system after primary crosslinking (gel system with a concentration of 0.3% polymer in example 6) and a system without primary crosslinking agent at a rate of 0.5mL/min, the pressure change was recorded, and after the displacement pressure was stabilized, the core was taken out.

(4) And scraping quartz sand and gel in the core fracture, adhering the wall surface of the fracture, and then testing the matrix permeability of the core again to be 0.17mD to obtain the matrix injury degree of the secondary crosslinking gel system to be 5.6%, wherein the matrix injury rate without adding the primary crosslinking agent system is 20.15%.

For visual testing of the fluid loss of the system, the fluid loss of the secondary gel system after primary crosslinking (wherein the concentration of the polymer is 0.3%) and the fluid loss of the system without adding the primary crosslinking agent were studied by using an FADLT-1 type fracturing and acidifying working fluid dynamic fluid loss instrument, and the initial fluid loss and the accumulated fluid loss for 2 hours were respectively 0.004m ³ /m ² ，0.5mL；0.028m ³ /m ² 2.1mL, the formation of the primary gel during ground sample preparation can effectively reduce the fluid loss of the system, and has a certain protection effect on the matrix.

The foregoing detailed description is directed to one of the possible embodiments of the present invention, which is not intended to limit the scope of the invention, but is to be accorded the full scope of all such equivalents and modifications so as not to depart from the scope of the invention.

Claims (17)

1. The cucurbituril hybrid polymer is characterized by comprising the following preparation raw materials: acrylamide, cucurbit acrylate, N-vinylimidazole, 2-acrylamido-dodecylsulfonic acid.

2. The cucurbituril hybrid polymer of claim 1, comprising the following preparation raw materials in parts by mole: 0.25-0.45 part of acrylamide, 0.01-0.05 part of acrylic acid cucurbit ester, 0.05-0.1 part of N-vinylimidazole and 0.05-0.1 part of 2-acrylamide-dodecyl sulfonic acid.

3. The cucurbituril hybrid polymer of claim 1, wherein the viscosity average molecular weight of the cucurbituril hybrid polymer is 300 ten thousand to 1000 ten thousand, the solid content is 95%, the number of glycoluril structural units in cucurbituril is 5,6,7,8, and the structure of the cucurbituril hybrid polymer is as follows:

wherein x, y, m, n is the degree of polymerization of the monomer, x: y: m: n=0.25 to 0.45:0.01 to 0.05:0.05 to 0.1:0.05 to 0.1.

4. A method for preparing the cucurbituril hybrid polymer according to any one of claims 1 to 3, which comprises the steps of:

(1) Adding acrylamide, acrylic acid cucurbit ester, N-vinyl imidazole and 2-acrylamide-dodecyl sulfonic acid into deionized water according to a molar ratio to obtain a monomer solution;

(2) And adding an initiator, and reacting to obtain the cucurbituril hybrid polymer.

5. The method for preparing a cucurbituril hybrid polymer according to claim 4, wherein in (1), the total mass concentration of acrylamide, cucurbituril acrylate, N-vinylimidazole and 2-acrylamido-dodecylsulfonic acid in the monomer solution is 20% to 30%.

6. The method for preparing a cucurbituril hybrid polymer according to claim 4, wherein in (2), the initiator is azobisisobutylamidine hydrochloride.

7. The method for preparing a cucurbituril hybrid polymer according to claim 4, wherein the amount of the initiator is 0.01 to 0.05% of the total mass of acrylamide, cucurbituril acrylate, N-vinylimidazole and 2-acrylamido-dodecylsulfonic acid.

8. The method for preparing a cucurbituril hybrid polymer according to claim 4, wherein in (2), an inert gas is introduced after the initiator is added for 30 to 60 minutes, and the inert gas is nitrogen or helium.

9. The method for preparing the cucurbituril hybrid polymer according to claim 4, wherein the reaction temperature is 40-60 ℃ and the reaction time is 4-8h.

10. Use of a cucurbituril hybrid polymer according to any one of claims 1 to 3 or prepared by a method of preparing a cucurbituril hybrid polymer according to any one of claims 4 to 9 for preparing a secondary cross-linked cucurbituril hybrid polymer gel.

11. A secondary cross-linked cucurbituril hybrid polymer gel comprising the following components: a cucurbituril hybrid polymer according to any one of claims 1 to 3 or a cucurbituril hybrid polymer prepared by the method for preparing a cucurbituril hybrid polymer according to any one of claims 4 to 9, a primary crosslinking agent, a secondary crosslinking agent, an activator, and a high temperature stabilizer.

12. The secondary cross-linked cucurbituril hybrid polymer gel of claim 11, comprising the following components in mass percent: 0.2-2% of cucurbituril hybrid polymer, 0.01-0.03% of primary cross-linking agent, 0.1-1% of secondary cross-linking agent, 0.05-0.2% of activating agent, 0.05-5% of high-temperature stabilizing agent and the balance of water.

13. The secondary cross-linked cucurbituril hybrid polymer gel according to claim 11,

the primary cross-linking agent is any one or more of organic chromium, aluminum citrate, aluminum sulfate, resol, catechol, resorcinol, hexamethylenetetramine and oxalic acid modified rare earth chloride; the secondary cross-linking agent is any one or more of organic phenolic aldehyde, water-soluble polyethyleneimine, formaldehyde, paraformaldehyde, borax, nano zirconium diboride, alkali-catalyzed phenolic resin and chloropropene phenolic resin.

14. The secondary cross-linked cucurbituril hybrid polymer gel of claim 11, wherein the high temperature stabilizer is any one or more of nano sodium bentonite, polyethylene glycol, polyvinyl alcohol, and PA fiber.

15. The secondary cross-linked cucurbituril hybrid polymer gel of claim 11, wherein the activator is any one or more of ammonium acetate, ammonium chloride, ammonium bicarbonate, and citric acid.

16. A process for preparing a secondary cross-linked cucurbituril hybrid polymer gel according to any one of claims 11 to 15, comprising the steps of:

s1, preparing cucurbituril hybrid polymer solution;

s2, diluting the cucurbituril hybrid polymer solution with water to a required concentration, adding a high-temperature stabilizer and an activator, and then sequentially adding a primary cross-linking agent and a secondary cross-linking agent to obtain the secondary cross-linked cucurbituril hybrid polymer gel.

17. Use of the cucurbituril hybrid polymer of any of claims 1-3 or the cucurbituril hybrid polymer gel of any of claims 11-15 for gas migration prevention in a gas-driven tight reservoir.