Foam carrier and catalytic modification system and application for heavy oil steam recovery

Abstract

The present invention relates to the technical field of heavy oil reservoir development, and discloses a foam carrier and catalytic modification system and application for heavy oil steam extraction. The foam carrier comprises a foaming agent, inorganic particles and water, wherein the foaming agent is selected from two or more of lauryl glucoside, kochia saponin, tea saponin and Tween 40, and the inorganic particles are selected from one or more of fly ash, nano-bentonite or silicon dioxide. The present invention provides a foam carrier with good heat resistance and good compatibility with an oil phase modifier. The foam carrier is based on a foaming agent solution, to which a certain amount of inorganic particles is added. While enhancing the viscosity of the foam base liquid, the mechanical strength of the foam carrier interface film can also be enhanced, so that the foam carrier has a good foam stabilizing effect and also has a certain stabilizing effect on the oil phase modifier, ultimately allowing the foam to reach a stable state after contacting the oil phase modifier, and achieving the purpose of enhancing heat resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of heavy oil reservoir development, and in particular to a foam carrier and catalytic modification system for heavy oil steam production and applications. Background Art

[0002] SAGD technology is a highly efficient method for heavy oil recovery. Its key principle is to inject high-dryness steam, which condenses at the boundaries of a steam chamber and transfers heat to the surrounding oil sands. The condensed water and heated crude oil flow by gravity toward the production well at the bottom of the steam chamber, where they are then transported to the surface. After the steam injection establishes thermal connectivity, it overlies the formation, forming a steam chamber. The steam chamber then moves upward and laterally, exchanging heat with the crude oil in the reservoir. The heated crude oil reduces its viscosity and increases its fluidity, allowing it to be produced from the production well. However, thermal recovery suffers from high energy consumption, complex technology, and limited applicability, making it inadequate for current heavy oil recovery needs. Hydrothermal catalytic cracking offers a new approach to heavy oil recovery. This approach simultaneously injects steam and delivers appropriate reforming catalysts and other additives to the oil reservoir. This allows the heavy components in the heavy oil to be catalytically cracked under hydrothermal conditions, reducing their viscosity and facilitating recovery, significantly improving oil recovery efficiency. However, as heavy oil is produced, the steam chamber gradually expands, preventing the hydrothermal catalytic cracking agent from crossing the steam chamber and directly reaching unrecovered heavy oil.

[0003] Based on heavy oil steam recovery technology, the current development direction is to develop environmentally friendly and heat-resistant carriers for reforming systems to address the difficulties of reforming catalyst migration within the steam chamber and steam channeling. By injecting the carrier, catalyst particles can migrate with the carrier within the steam chamber, passing through the steam chamber to contact the oil layer in the upper part of the reservoir, thereby cracking and reducing viscosity. Water-based carrier systems reduce the efficiency of steam heat utilization and the economic viability of thermal recovery. Single foam carriers are widely used due to their environmental friendliness and good migration characteristics within different pore spaces. However, due to the high reservoir temperature during thermal recovery, the foam strength is low, resulting in poor results after multiple cycles of implementation. Therefore, enhancing the foam's heat resistance and stability is a technical challenge for reforming carriers.

[0004] The application of foam carriers in the steam chamber not only improves the contact efficiency between the modifier and heavy oil, but also allows for displacement within the steam chamber, plugging high-permeability pores, controlling gas channeling, reducing crude oil viscosity, and improving crude oil rheology. Compared to the steam injected earlier, the foam significantly reduces the mobility ratio after entering the steam chamber, ensuring full contact between the modifier and the crude oil, extending contact time and reducing costs. Summary of the Invention

[0005] The purpose of the present invention is to overcome the problems of poor stability and temperature resistance of foam carriers used to carry heavy oil modifiers in steam chambers in the prior art, and to provide a foam carrier and catalytic modification system and application for heavy oil steam extraction.

[0006] In order to achieve the above-mentioned object, the first aspect of the present invention provides a foam carrier for heavy oil steam extraction, wherein the foam carrier comprises a foaming agent, inorganic particles and water, wherein the foaming agent is selected from two or more of lauryl glucoside, kochia saponin, tea saponin and Tween 40, and the inorganic particles are selected from one or more of fly ash, nano-bentonite or silica.

[0007] The second aspect of the present invention provides the use of the foam carrier in heavy oil production.

[0008] A third aspect of the present invention provides a catalytic reforming system for heavy oil steam recovery, wherein the catalytic reforming system comprises a reforming agent and the foam carrying agent.

[0009] A fourth aspect of the present invention provides application of the catalytic upgrading system in heavy oil production.

[0010] Through the above technical solution, the present invention provides a foam carrier with good temperature resistance and good compatibility with an oil-phase modifier. The foam carrier is based on a foaming agent solution. During the preparation of the foaming agent solution, a certain amount of inorganic particles is added thereto. While increasing the viscosity of the foam base liquid, the mechanical strength of the foam carrier interfacial film can also be enhanced. The foam carrier has a good foam stabilizing effect and also has a certain stabilizing effect on the oil-phase modifier. Ultimately, the foam reaches a stable state after contacting the oil-phase modifier, and the purpose of enhancing the temperature resistance is achieved. The foam carrier still has the ability to migrate in the steam chamber after carrying the oil-phase modifier, thereby ensuring that the modifier can smoothly reach the top of the steam chamber to crack and reduce the viscosity of the heavy oil reservoir before extraction. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The foaming volume of foam carriers A1-A5 and B1-B4 at 25°C and 220°C;

[0012] Figure 2 is the foam half-life of foam carriers A1-A5 and B1-B4 at 25°C and 220°C;

[0013] Figure 3 is the foaming volume of catalytic modified systems C1-C5 and D1-D4 at 25℃ and 220℃;

[0014] Figure 4 It is the foam half-life of catalytic modified systems C1-C5 and D1-D4 at 25℃ and 220℃. DETAILED DESCRIPTION

[0015] The endpoints of the ranges and any values ​​disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoints of each range, the endpoints of each range and individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered to be specifically disclosed herein.

[0016] A first aspect of the present invention provides a foam carrier for heavy oil steam extraction, wherein the foam carrier comprises a foaming agent and inorganic particles, wherein the foam carrier comprises a foaming agent, inorganic particles and water, wherein the foaming agent is selected from two or more of lauryl glucoside (APG), kochia saponin (ZS), tea saponin (TS), and Tween 40 (YC), and the inorganic particles are selected from one or more of fly ash (EMH), nano-bentonite (PR) or silicon dioxide (WSI).

[0017] In some specific embodiments of the present invention, preferably, the foaming agent is a combination of lauryl glucoside, kochia saponin, tea saponin and Tween 40; wherein, relative to the total amount of the foam carrier, lauryl glucoside is 0.1-0.15wt%, kochia saponin is 0.1-0.15wt%, tea saponin is 0.1-0.15wt%, and Tween 40 is 0.1-0.15wt%.

[0018] In the present invention, the foaming agent includes lauryl glucoside and Tween 40 as well as pentacyclic triterpenoid foaming agents, among which Kochia scoparia saponin and tea saponin are both pentacyclic triterpenoid foaming agents. Pentacyclic triterpenoid foaming agents are relatively advanced in terms of temperature resistance compared to conventional foaming agents. For pentacyclic triterpenoid foaming agents, when they contain a large number of hydrophilic groups such as hydroxyl groups and sulfonic acid groups, they have a strong affinity for water molecules, which can greatly reduce the water molecules from leaving the liquid film, thereby preventing drainage. When the temperature rises, the water molecules still tend to be retained inside the liquid film, which is manifested as excellent foam temperature resistance for the foam carrier. When the temperature continues to rise, the carbon-carbon bond in the foaming agent molecule is easily broken, resulting in the inactivation of the foaming agent. Introducing groups with larger bond energy into the foaming agent molecule can effectively improve the temperature resistance limit of the foaming agent. Lauryl glucoside, with its 12-carbon hydrophobic end and numerous hydroxyl groups, exhibits excellent stability at the water-air interface. Therefore, at room temperature, before adding modifiers, its foam volume and foam half-life are excellent, and its compatibility with inorganic particles is optimal. Tween 40, a heat-resistant foaming agent, exhibits excellent foam stability at high temperatures.

[0019] Therefore, the present invention combines lauryl glucoside, Tween 40 and pentacyclic triterpenoid foaming agents to achieve very good composite foam stability, ultimately allowing the foam to reach a stable state after contacting the oil phase modifier, and achieving the purpose of enhancing the temperature resistance. The enhanced foam carrying agent still has the ability to migrate in the steam chamber after carrying the material, thereby ensuring that the modifier smoothly reaches the top of the steam chamber to crack and reduce the viscosity of the heavy oil reservoir before extraction.

[0020] In some specific embodiments of the present invention, in the foam carrier, the foaming agent accounts for 0.3-0.5 wt %, the inorganic particles account for 0.15-0.2 wt %, and water accounts for 99.3-99.55 wt %.

[0021] In some specific embodiments of the present invention, in the foam carrier, the foaming agent accounts for 0.35-0.5 wt %, the inorganic particles account for 0.17-0.2 wt %, and water accounts for 99.3-99.48 wt %.

[0022] In some specific embodiments of the present invention, in the foam carrier, the mass ratio of the foaming agent to the inorganic particles is 2.5-2.9:1.

[0023] In some embodiments of the present invention, the average particle size of the inorganic particles is 0.05-1 micron. Within this range, the average particle size of the inorganic particles can enhance the viscosity of the foam base liquid while also enhancing the mechanical strength of the foam carrier interface film, thereby improving the stability of the foam system.

[0024] In the present invention, inorganic particles act in the system, not only enhancing the viscosity of the foaming agent so that the foam formed after foaming has a larger viscoelastic modulus, but also forming a layer of micro-nano particle armor on the surface of the foam liquid film, delaying the drainage process of the foam system, thereby achieving temperature-resistant and stable mass-carrying foam.

[0025] In the present invention, the inorganic particles are selected from fly ash (EMH), nano-bentonite (PR), or silicon dioxide (WSI). The inventors have discovered that the foam carrier formed by the inorganic silicon dioxide particles and the aforementioned foaming agent has superior performance, while the foam stability, temperature resistance, and mass-carrying stability of fly ash and nano-bentonite are inferior to those of the inorganic silicon dioxide particles.

[0026] In some specific embodiments of the present invention, the foam carrier has a foam volume of 380-450 mL at 25°C, and a half-life of 14-38 minutes, preferably 30-38 minutes, at 25°C. Preferably, the foam carrier has a foam volume of 340-400 mL at 220°C, and a half-life of 5-25 minutes, preferably 15-22 minutes, at 220°C. A larger product of the foam volume and half-life indicates better foam stability of the system.

[0027] In the present invention, the foam carrier has excellent heat resistance. The foaming agent prepared by compounding lauryl glucoside, kochia saponin, tea saponin, and Tween 40, combined with inorganic particles, can achieve a foaming volume of 380 mL at 220°C, with a foam half-life of 22 minutes. After adding 5-8% of a modifier, a catalytic modification system is formed, and at the same temperature, the foaming volume reaches 390 mL, and the foam half-life reaches 20 minutes. This meets the conditions of formations treated with steam flooding as the precursor and still has good stability at 220°C. In addition, the foam carrier exhibits even better stability after carrying the material.

[0028] The second aspect of the present invention provides the use of the foam carrier in heavy oil production.

[0029] A third aspect of the present invention provides a catalytic reforming system for heavy oil steam recovery, wherein the catalytic reforming system comprises a reforming agent and the foam carrying agent.

[0030] In some specific embodiments of the present invention, based on the total amount of the catalytic modification system, in the catalytic modification system, the modifying agent is 5-8 wt %, and the foam carrying agent is 92-95 wt %.

[0031] In some specific embodiments of the present invention, the modifier is a solvent oil solution containing ferric naphthenate, wherein the iron content in the modifier is 5-7wt%, the modifier has a viscosity reduction rate of over 70%, and after the addition of the modifier, the viscosity of the heavy oil is reduced by over 70%. The modifier is an oil-phase solution, and the foam carrier system has the characteristic of defoaming when exposed to oil. Therefore, a foam carrier with good compatibility with the modifier is required to achieve the mass carrying stability of the catalytic modification system.

[0032] In some specific embodiments of the present invention, the foaming volume of the catalytic modification system at 25°C is 330-450mL, and the half-life of the catalytic modification system at 25°C is 10-35min, preferably 25-35min; the foaming volume of the catalytic modification system at 220°C is 330-390mL, and the half-life of the catalytic modification system at 220°C is 6-20min, preferably 14-20min. The foam carrier of the present invention has good compatibility with the oil phase modifier, and has a large foaming volume and half-life at 220°C. It can be seen that the foam carrier system of the present invention has very good mass carrying stability, so that it has a good foam stabilizing effect while also playing a certain stabilizing role on the oil phase modifier, and ultimately makes the foam reach a stable state after contacting the oil phase modifier, and achieves the purpose of enhancing the temperature resistance, so that the enhanced foam carrier still has the ability to migrate in the steam chamber after carrying the mass, thereby ensuring that the modifier smoothly reaches the top of the steam chamber to crack and reduce the viscosity of the heavy oil reservoir and then recover it.

[0033] A fourth aspect of the present invention provides application of the catalytic upgrading system in heavy oil production.

[0034] The present invention will be described in detail below through examples.

[0035] Lauryl glucoside was purchased from Shandong Yousuo Chemical Technology Co., Ltd.;

[0036] Kochia scoparia saponins were purchased from Maclean's Reagent Network;

[0037] Tea saponin was purchased from Shanghai Yingxin Laboratory Equipment Co., Ltd.

[0038] Tween 40 was purchased from Thermo Fisher Scientific (China) Co., Ltd.;

[0039] Fly ash was purchased from Lingshou County Yiran Mineral Products Processing Plant;

[0040] Naki bentonite (PR) was purchased from Anyang Yihe Bentonite Co., Ltd.;

[0041] Fumed silica (WSI) was purchased from MacLean Reagent Network.

[0042] The heavy oil modifier carried by the heat-resistant foam in the present invention is a solvent oil solution containing iron naphthenate (iron content 5-7%, viscosity reduction rate of more than 70%), which is purchased from Maclean Reagent Network.

[0043] Measurement method of foam volume and foam half-life (abbreviated as half-life):

[0044] Prepare 100 mL of a foaming agent solution of a certain concentration at a certain temperature and normal pressure. Use a GJ-3H high-speed stirrer at 7000 r / min for 3 minutes to generate foam. Transfer the generated foam to a 2 L graduated cylinder within 30 seconds after the stirring is completed. Record the foaming volume of the generated foam to evaluate the foaming ability of the foaming agent. Start timing after the foam is transferred into the graduated cylinder and stop timing when the foam volume in the graduated cylinder decays to half. Record the foam half-life time to evaluate the stability of the generated foam.

[0045] In the following examples and comparative examples, if no specific conditions are specified, the experiments were carried out under conventional conditions or those recommended by the manufacturer. All reagents and instruments used, if no manufacturer is specified, are commercially available conventional products.

[0046] Preparation Example 1

[0047] 0.2 wt% of WSI inorganic particles and 99.3 wt% of water were added to a foaming agent composed of 0.1 wt% of lauryl glucoside, 0.1 wt% of kochia saponin, 0.15 wt% of tea saponin, and 0.15 wt% of Tween 40, and the mixture was placed in a high-speed blender and stirred at 7000 r / min for 3 min to form a foam carrier A1. The stability of the foam carrier was determined by measuring the foaming volume and half-life at 25°C and 220°C. The mass ratio of the foaming agent to the inorganic particles was 2.5:1, and the average particle size of the inorganic particles was 0.05 μm.

[0048] Preparation Example 2

[0049] 0.2 wt% of WSI inorganic particles and 99.3 wt% of water were added to a foaming agent composed of 0.2 wt% of kochia saponin, 0.15 wt% of tea saponin, and 0.15 wt% of Tween 40, and the whole was placed in a high-speed stirrer and stirred at a speed of 7000 r / min for 3 minutes to form a foam carrier A2. The stability of the foam carrier was determined by measuring the foaming volume and half-life at 25°C and 220°C. The mass ratio of the foaming agent to the inorganic particles was 2.5:1, and the average particle size of the inorganic particles was 0.05 microns.

[0050] Preparation Example 3

[0051] 0.2 wt% of WSI inorganic particles and 99.3 wt% of water were added to a foaming agent composed of 0.1 wt% of lauryl glucoside, 0.1 wt% of kochia saponin, and 0.3 wt% of tea saponin, and the mixture was placed in a high-speed stirrer and stirred at 7000 r / min for 3 minutes to form a foam carrier A3. The stability of the foam carrier was determined by measuring the foaming volume and half-life at 25°C and 220°C. The mass ratio of the foaming agent to the inorganic particles was 2.5:1, and the average particle size of the inorganic particles was 0.05 microns.

[0052] Preparation Example 4

[0053] 0.2 wt% of WSI inorganic particles and 99.3 wt% of water were added to a foaming agent composed of 0.2 wt% of lauryl glucoside and 0.3 wt% of Tween 40, and the mixture was placed in a high-speed stirrer and stirred at 7000 r / min for 3 minutes to form a foam carrier A4. The stability of the foam carrier was determined by measuring the foam volume and half-life at 25°C and 220°C. The mass ratio of the foaming agent to the inorganic particles was 2.5:1, and the average particle size of the inorganic particles was 0.05 microns.

[0054] Preparation Example 5

[0055] 0.2 wt% of PR inorganic particles and 99.3 wt% of water were added to a foaming agent composed of 0.1 wt% of lauryl glucoside, 0.1 wt% of kochia saponin, 0.15 wt% of tea saponin, and 0.15 wt% of Tween 40, and the mixture was placed in a high-speed blender and stirred at 7000 r / min for 3 min to form a foaming agent A5. The stability of the foaming agent was determined by measuring the foaming volume and half-life at 25°C and 220°C. The mass ratio of the foaming agent to the inorganic particles was 2.5:1, and the average particle size of the inorganic particles was 1 micron.

[0056] Preparation Comparative Example 1

[0057] To a foaming agent containing 0.5 wt% of lauryl glucoside, 0.2 wt% of WSI inorganic particles and 99.3 wt% of water were added, and the whole was placed in a high-speed stirrer and stirred at a speed of 7000 r / min for 3 minutes to form a foam carrier B1. The stability of the foam carrier was determined by measuring the foam volume and half-life at 25°C and 220°C.

[0058] Preparation Comparative Example 2

[0059] 0.2 wt% of WSI inorganic particles and 99.3 wt% of water were added to a foaming agent containing 0.5 wt% of Kochia scoparia saponin, and the whole was placed in a high-speed stirrer and stirred at 7000 r / min for 3 min to form a foam carrier B2. The stability of the foam carrier was determined by measuring the foam volume and half-life at 25°C and 220°C.

[0060] Preparation Comparative Example 3

[0061] 0.2 wt% of WSI inorganic particles and 95 wt% of water were added to a foaming agent containing 0.5 wt% of tea saponin, and the whole was placed in a high-speed stirrer and stirred at a speed of 7000 r / min for 3 minutes to form a foam carrier B3. The stability of the foam carrier was determined by measuring the foam volume and half-life at 25°C and 220°C.

[0062] Preparation Comparative Example 4

[0063] 0.2 wt % of WSI inorganic particles and 95 wt % of water were added to a foaming agent containing 0.5 wt % of Tween 40, and the mixture was placed in a high-speed stirrer and stirred at 7000 r / min for 3 min to form a foam carrier B4. The stability of the foam carrier was determined by measuring the foam volume and half-life at 25°C and 220°C.

[0064] The foaming volume and half-life of the foaming agents obtained in Preparation Examples 1-5 and Comparative Preparation Examples 1-4 at 25° C. were measured. The results are shown in Table 1.

[0065] Table 1

[0066] foaming agent Foaming volume / mL Foam half-life / min Preparation Example 1 470 15 Preparation Example 2 430 13 Preparation Example 3 460 15 Preparation Example 4 470 12 Preparation Example 5 470 10 Preparation Comparative Example 1 500 8 Preparation Comparative Example 2 420 6 Preparation Comparative Example 3 440 9 Preparation Comparative Example 4 420 6

[0067] The foaming volume and half-life of the foam carriers A1-A5 and B1-B4 obtained in Preparation Examples 1-5 and Comparative Examples 1-4 at 25° C. were measured. The results are shown in Table 2.

[0068] Table 2

[0069] Foam carrier Foaming volume / mL Foam half-life / min A1 400 38 A2 370 33 A3 420 36 A4 390 30 A5 450 14 B1 420 20 B2 370 18 B3 380 18 B4 360 13

[0070] It can be seen from Tables 1 and 2 that the foam carrier formed by the foaming agent and inorganic particles of the present invention, by compounding the foaming agent and adding inorganic particles at the same time, makes the foam carrier have a higher foaming volume and foam half-life, enhances the foam stability, and has a good foam stabilizing effect.

[0071] Test Example 1: Temperature resistance of foam carrier

[0072] The foam carriers A1-A5 and B1-B4 obtained above were placed at 25°C and 220°C for stability evaluation. The results are as follows: Figure 1 、 Figure 2 shown.

[0073] Depend on Figure 1-2 The results show that as temperature increases, the foam volume and foam half-life of all foam carriers decrease. While A1-A3 exhibit a significant decrease in half-life, their originally long half-lives at room temperature ultimately maintain a significant performance advantage even at elevated temperatures. A5, a PR particle-stabilized foam, demonstrates poor compatibility with this four-component foaming agent. A4, a two-component foaming agent, exhibits slightly lower thermal stability than the three- and four-component foaming agents, but still offers considerable advantages compared to other single-component foaming agents.

[0074] Example 1

[0075] The water content in the foam carrier A1 was changed to 90%, and 5 wt% of a heavy oil modifier was added. The entire mixture was placed in a high-speed stirrer and stirred at 7000 r / min for 3 minutes to obtain a catalytic modification system C1. The foaming volume and half-life of the catalytic modification system were measured at 25°C and 220°C to determine the mass-carrying stability of the foam carrier.

[0076] Example 2

[0077] The water content in the foam carrier A2 was changed to 90%, and 5 wt% of a heavy oil modifier was added. The entire mixture was placed in a high-speed stirrer and stirred at a speed of 7000 r / min for 3 minutes to obtain a catalytic modification system C2. The foaming volume and half-life of the catalytic modification system were measured at 25°C and 220°C to determine the mass carrying stability of the foam carrier.

[0078] Example 3

[0079] The water content in the foam carrier A3 was changed to 90%, and 5 wt% of a heavy oil modifier was added. The entire mixture was placed in a high-speed stirrer and stirred at 7000 r / min for 3 minutes to obtain a catalytic modification system C3. The foaming volume and half-life of the catalytic modification system were measured at 25°C and 220°C to determine the mass carrying stability of the foam carrier.

[0080] Example 4

[0081] The water content in the foam carrier A4 was changed to 90%, and 5 wt% of a heavy oil modifier was added. The entire mixture was placed in a high-speed stirrer and stirred at 7000 r / min for 3 minutes to obtain a catalytic modification system C4. The foaming volume and half-life of the catalytic modification system were measured at 25°C and 220°C to determine the mass carrying stability of the foam carrier.

[0082] Example 5

[0083] The water content in the foam carrier A5 was changed to 90%, and 5 wt% of a heavy oil modifier was added. The entire mixture was placed in a high-speed stirrer and stirred at 7000 r / min for 3 minutes to obtain a catalytic modification system C5. The foaming volume and half-life of the catalytic modification system were measured at 25°C and 220°C to determine the mass carrying stability of the foam carrier.

[0084] Comparative Example 1

[0085] The water content in the foam carrier B1 was changed to 90%, and 5 wt% of a heavy oil modifier was added. The entire mixture was placed in a high-speed stirrer and stirred at a speed of 7000 r / min for 3 minutes to obtain a catalytic modification system D1. The foaming volume and half-life of the catalytic modification system were measured at 25°C and 220°C to determine the mass carrying stability of the foam carrier.

[0086] Comparative Example 2

[0087] The water content in the foam carrier B2 was changed to 90%, and 5 wt% of a heavy oil modifier was added. The entire mixture was placed in a high-speed stirrer and stirred at a speed of 7000 r / min for 3 minutes to obtain a catalytic modification system D2. The foaming volume and half-life of the catalytic modification system were measured at 25°C and 220°C to determine the mass carrying stability of the foam carrier.

[0088] Comparative Example 3

[0089] The water content in the foam carrier B3 was changed to 90%, and 5 wt% of a heavy oil modifier was added. The entire mixture was placed in a high-speed stirrer and stirred at 7000 r / min for 3 minutes to obtain a catalytic modification system D3. The foaming volume and half-life of the catalytic modification system were measured at 25°C and 220°C to determine the mass carrying stability of the foam carrier.

[0090] Comparative Example 4

[0091] The water content in the foam carrier B4 was changed to 90%, and 5 wt% of a heavy oil modifier was added. The entire mixture was placed in a high-speed stirrer and stirred at 7000 r / min for 3 minutes to obtain a catalytic modification system D4. The foaming volume and half-life of the catalytic modification system were measured at 25°C and 220°C to determine the mass-carrying stability of the foam carrier.

[0092] Test Example 2: Carrying Mass Stability

[0093] The foaming volume and half-life of the catalytic modified systems C1-C5 and D1-D4 at 25°C were measured to determine the mass carrying stability of the foam carrier. The results are shown in Table 3.

[0094] Table 3

[0095] Catalytic reforming system Foaming volume / mL Foam half-life / min Carrying mass stability C1 400 35 excellent C2 370 25 good C3 410 25 good C4 330 14 good C5 440 10 good D1 410 6 Difference D2 370 9 Difference D3 360 9 Difference D4 350 3 Difference

[0096] As can be seen from Table 3, the foaming agent of catalytically modified system C1 is a compound system of lauryl glucoside, kochia saponins, tea saponin, and Tween 40. The foam half-life after carrying the agent is much longer than that of the other comparative examples, and the foam volume is also larger. Therefore, the addition of the oil-phase modifier to catalytically modified system C1 does not cause its original stability to be damaged. The half-life of catalytically modified systems C2-C5 all decreases within a certain range due to the introduction of the modifier. However, compared with the comparative examples, the catalytically modified systems C2-C5 have better mass carrying stability than the comparative examples.

[0097] Test Example 3: Temperature resistance of catalytic modification system

[0098] The stability tests of the catalytic modified systems C1-C5 and D1-D4 were carried out at 25℃ and 220℃ respectively. The results are as follows: Figure 3 、 Figure 4 shown.

[0099] Depend on Figure 3-4 The results show that the foam half-life of the catalytically modified systems is affected to varying degrees at high temperatures. C1, as the optimal system, exhibits the best heat resistance. Systems C2 and C3 have slightly lower performance than C1, but still offer a certain stability advantage over the control. The addition of an oil-phase modifier destabilizes the foam carrier system, resulting in D2 exhibiting almost no foaming.

[0100] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, various simple variations of the technical solution of the present invention may be made, including combining the various technical features in any other appropriate manner. These simple variations and combinations should also be regarded as disclosed in the present invention and fall within the scope of protection of the present invention.

Claims

1. A foam carrier for heavy oil steam extraction, characterized in that: The foam carrier comprises a foaming agent, inorganic particles and water, wherein the foaming agent is selected from two or more of lauryl glucoside, kochia saponin, tea saponin and Tween 40, and the inorganic particles are selected from one or more of fly ash, nano-bentonite or silicon dioxide; The foaming agent is a compound of lauryl glucoside, kochia saponin, tea saponin and Tween 40.

2. The foam carrier according to claim 1, characterized in that in, Relative to the total amount of the foam carrier, the lauryl glucoside is 0.1-0.15wt%, the kochia saponin is 0.1-0.15wt%, the tea saponin is 0.1-0.15wt%, and the Tween 40 is 0.1-0.15wt%.

3. The foam carrier according to claim 1 or 2, characterized in that In the foam carrier, the foaming agent accounts for 0.3-0.5 wt %, the inorganic particles account for 0.15-0.2 wt %, and water accounts for 99.3-99.55 wt %.

4. The foam carrier according to claim 3, characterized in that In the foam carrier, the foaming agent accounts for 0.35-0.5 wt %, the inorganic particles account for 0.17-0.2 wt %, and water accounts for 99.3-99.48 wt %.

5. The foam carrier according to any one of claims 1, 2 or 4, characterized in that In the foam carrier, the mass ratio of the foaming agent to the inorganic particles is 2.5-2.9:

1.

6. The foam carrier according to claim 3, characterized in that In the foam carrier, the mass ratio of the foaming agent to the inorganic particles is 2.5-2.9:

1.

7. The foam carrier according to any one of claims 1, 2, 4 or 6, characterized in that The average particle size of the inorganic particles is 0.05-1 micron.

8. The foam carrier according to claim 3, characterized in that The average particle size of the inorganic particles is 0.05-1 micron.

9. The foam carrier according to claim 5, characterized in that The average particle size of the inorganic particles is 0.05-1 micron.

10. The foam carrier according to any one of claims 1, 2, 4, 6, 8 or 9, characterized in that The foaming volume of the foam carrier at 25° C. is 380-450 mL, and the half-life of the foam carrier at 25° C. is 14-38 min.

11. The foam carrier according to claim 10, characterized in that The foaming volume of the foam carrier at 25° C. is 380-450 mL, and the half-life of the foam carrier at 25° C. is 30-38 min.

12. The foam carrier according to claim 3, characterized in that The foaming volume of the foam carrier at 25° C. is 380-450 mL, and the half-life of the foam carrier at 25° C. is 14-38 min.

13. The foam carrier according to claim 12, characterized in that The foaming volume of the foam carrier at 25° C. is 380-450 mL, and the half-life of the foam carrier at 25° C. is 30-38 min.

14. The foam carrier according to claim 5, characterized in that The foaming volume of the foam carrier at 25° C. is 380-450 mL, and the half-life of the foam carrier at 25° C. is 14-38 min.

15. The foam carrier according to claim 14, characterized in that The foaming volume of the foam carrier at 25° C. is 380-450 mL, and the half-life of the foam carrier at 25° C. is 30-38 min.

16. The foam carrier according to claim 7, characterized in that The foaming volume of the foam carrier at 25° C. is 380-450 mL, and the half-life of the foam carrier at 25° C. is 14-38 min.

17. The foam carrier according to claim 16, characterized in that The foaming volume of the foam carrier at 25° C. is 380-450 mL, and the half-life of the foam carrier at 25° C. is 30-38 min.

18. The foam carrier according to claim 10, characterized in that The foaming volume of the foam carrier at 220° C. is 340-400 mL, and the half-life of the foam carrier at 220° C. is 5-25 min.

19. The foam carrier according to claim 18, characterized in that The foaming volume of the foam carrier at 220° C. is 340-400 mL, and the half-life of the foam carrier at 220° C. is 15-22 min.

20. Use of the foam carrier according to any one of claims 1 to 19 in heavy oil production.

21. A catalytic reforming system for heavy oil steam recovery, characterized in that: The catalytic modification system comprises a modifier and a foam carrier according to any one of claims 1 to 19; Wherein, the modifier is a solvent oil solution containing iron naphthenate.

22. The catalytic reforming system according to claim 21, characterized in that: Based on the total amount of the catalytic modification system, in the catalytic modification system, the modifier is 5-8wt% and the foam carrier is 92-95wt%; And / or, the modifier is a solvent oil solution containing iron naphthenate, wherein the iron content in the modifier is 5-7wt%, and the viscosity reduction rate of the modifier is more than 70%.

23. The catalytic upgrading system according to claim 21 or 22, characterized in that: The foaming volume of the catalytic modification system at 25°C is 330-450 mL, and the half-life of the catalytic modification system at 25°C is 10-35 min; And / or, the foaming volume of the catalytic modification system at 220° C. is 330-390 mL, and the half-life of the catalytic modification system at 220° C. is 6-20 min.

24. The catalytic upgrading system according to claim 23, characterized in that: The foaming volume of the catalytic modification system at 25°C is 330-450 mL, and the half-life of the catalytic modification system at 25°C is 25-35 min; And / or, the foaming volume of the catalytic modification system at 220° C. is 330-390 mL, and the half-life of the catalytic modification system at 220° C. is 14-20 min.

25. Use of the catalytic upgrading system according to any one of claims 21 to 24 in heavy oil production.

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