Foam carrying agent for thickened oil steam recovery, catalytic modification system and application

Abstract

The invention relates to the technical field of heavy oil reservoir development, and discloses a foam carrying agent for heavy oil steam recovery, a catalytic modification system and application. Wherein the foam carrying agent comprises a foaming agent, inorganic particles and water, 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, sodium bentonite and silicon dioxide. The invention provides a foam carrying agent with good temperature resistance and good compatibility with an oil phase modifier, a foaming agent solution is used as a basis, a certain amount of inorganic particles are added into the foaming agent solution, the viscosity of a foam base solution is enhanced, meanwhile, the mechanical strength of an interfacial film of the foam carrying agent can be enhanced, the foam carrying agent has a good foam stabilizing effect, and meanwhile, the foam carrying agent has good temperature resistance and good compatibility with the oil phase modifier. A certain stabilizing effect is achieved on the oil phase modifier, finally, the foam is in a stable state after making contact with the oil phase modifier, and the purpose of strengthening the temperature resistance is achieved.

Description

Technical Field

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

[0002] SAGD technology is an efficient way to recover heavy oil. Its main content is to inject high-dryness steam, which condenses at the boundary of the steam chamber and transfers heat to the surrounding oil sands. Condensed water and heated crude oil flow to the production well at the bottom of the steam chamber under the action of gravity, and then are transported to the ground. After the steam is injected to form a thermal connection, the injected steam overlaps upward in the formation to form a steam chamber, which moves upward and laterally, and exchanges heat with the crude oil in the oil layer. The heated crude oil has a lower viscosity and an increased fluidity, and is produced from the production well. However, thermal recovery has problems such as high consumption, complex technology, and low applicability, which can no longer meet the current needs of heavy oil recovery. Hydrothermal catalytic cracking reaction brings a new idea for heavy oil recovery. It injects steam while also giving the oil layer a suitable reforming catalyst and other additives, so that the heavy components in the heavy oil can be catalytically cracked under hydrothermal conditions, thereby reducing its viscosity and making it easier to recover, greatly improving oil recovery efficiency. However, as the heavy oil is recovered, the steam chamber gradually expands, resulting in the inability of the hydrothermal catalytic cracking reformer of the heavy oil to cross the steam chamber and directly reach the unrecovered heavy oil.

[0003] Based on the heavy oil steam recovery technology, the current development direction is to develop a more environmentally friendly and heat-resistant reforming system carrier to address the difficulty of reforming catalyst migration in the steam chamber and the problem of steam channeling. By injecting the carrier, the catalyst particles can migrate with the carrier in the steam chamber, and then pass through the steam chamber to reach the upper part of the reservoir and contact the oil layer, playing a role in cracking and viscosity reduction. The water-based carrier system will reduce the efficiency of steam thermal utilization and the economic efficiency of thermal recovery. For a single foam carrier, it has been widely used due to its environmental friendliness and good migration characteristics in different pores. However, due to the high reservoir temperature and low foam strength during thermal recovery, the effect deteriorates after multiple rounds of implementation. Therefore, enhancing the foam's temperature resistance and stability is a technical difficulty for the reforming system carrier.

[0004] The application of foam carrier in steam chamber not only has the advantage of improving the contact efficiency between modifier and heavy oil, but also can adjust and drive the steam chamber, with the advantages of blocking high permeability channels, controlling gas channeling, reducing crude oil viscosity, and improving crude oil rheology. Compared with the steam injected in the early stage, the foam can also significantly reduce the mobility ratio after entering the steam chamber, so that the modifier can fully contact with the crude oil while extending the 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 poor temperature resistance of the foam carrier used to carry the heavy oil modifying agent in the steam chamber in the prior art, and to provide a foam carrier and catalytic modifying 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] The 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] The fourth aspect of the present invention provides the application of the catalytic upgrading system in heavy oil production.

[0010] Through the above technical scheme, 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 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. Finally, the foam reaches a stable state after contacting the oil phase modifier, and the purpose of enhancing the temperature resistance is achieved, so that the enhanced foam carrier 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. 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 the catalytic reforming systems C1-C5 and D1-D4 at 25°C and 220°C;

[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 and any values ​​of the ranges disclosed in this article 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 endpoint values ​​of each range, the endpoint values ​​of each range and the 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 as specifically disclosed in this article.

[0016] The 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 compound 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, Tween 40 and pentacyclic triterpenoid foaming agent, among which, Kochia scoparia saponin and tea saponin are pentacyclic triterpenoid foaming agents, which are relatively advanced in temperature resistance compared with 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 macroscopically. 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 has a hydrophobic end with 12 carbon atoms and a large number of hydroxyl groups, so it has good stability at the water-air interface. Therefore, at room temperature, before adding a modifier, its foaming volume and foam half-life are good, and its compatibility with inorganic particles is optimal. Tween 40 is a good temperature-resistant foaming agent, and it has good foam stability at high temperatures.

[0019] Therefore, the present invention combines lauryl glucoside, Tween 40 and pentacyclic triterpenoid foaming agents to have very good composite foam stability, and finally 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 carrying agent still has the migration ability 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 and then produce it.

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

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

[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 specific embodiments of the present invention, the average particle size of the inorganic particles is 0.05-1 micron. When the average particle size of the inorganic particles is within this range, the viscosity of the foam base liquid can be increased while the mechanical strength of the foam carrier interface film can be increased, which is beneficial to 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 layer 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). Among them, the inventors found that the foam carrier formed by the inorganic silicon dioxide particles and the above-mentioned foaming agent has better performance, and the foam stability, temperature resistance and mass carrying stability of fly ash and nano-bentonite are not as good as those of the inorganic silicon dioxide particles.

[0026] In some specific embodiments of the present invention, 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, preferably 30-38 min; preferably, 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, preferably 15-22 min. For the foaming volume and half-life of the foam, the larger the multiplication of the foaming volume and the half-life, the better the foam stability of the system.

[0027] In the present invention, the foam carrier has excellent temperature resistance. The foaming agent prepared by compounding lauryl glucoside, kochia saponin, tea saponin and Tween 40 is combined with inorganic particles, and the foaming volume can reach 380mL at 220°C, and the foam half-life reaches 22min. After adding 5-8% of the modifier, a catalytic modification system is formed, and the foaming volume reaches 390mL at the same temperature, and the foam half-life reaches 20min. It meets the formation conditions of steam flooding for the precursor treatment and still has good stability at 220°C. In addition, the foam carrier shows 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] The 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 modification agent is 5-8wt%, and the foam carrier is 92-95wt%.

[0031] In some specific embodiments of the present invention, the modifier is a solvent oil solution containing iron naphthenate, wherein the iron content in the modifier is 5-7wt%, the viscosity reduction rate of the modifier is more than 70%, and after adding the modifier, the viscosity of the heavy oil is reduced by more than 70%. The modifier is an oil phase solution, and the foam carrier system has the characteristic of defoaming when encountering oil, so 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 finally makes the foam reach a stable state after contacting the oil phase modifier, and achieves the purpose of strengthening 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 reaches the top of the steam chamber smoothly to crack and reduce the viscosity of the heavy oil reservoir and then produce it.

[0033] The fourth aspect of the present invention provides the 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, 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%, and viscosity reduction rate of more than 70%), which is purchased from MacLean Reagent Network.

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

[0044] A 100 mL foaming agent solution of a certain concentration was prepared at a certain temperature and normal pressure. The solution was stirred at 7000 r / min for 3 min using a GJ-3H high-speed stirrer to generate foam. The generated foam was transferred to a 2 L measuring cylinder within 30 s after the stirring. The foaming volume of the generated foam was recorded to evaluate the foaming ability of the foaming agent. The timing was started after the foam was transferred into the measuring cylinder and was stopped when the foam volume in the measuring cylinder decayed to half. The half-life of the foam was recorded 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 conditions recommended by the manufacturer. The reagents or instruments used, if no manufacturer is specified, are all conventional products that can be obtained through commercial channels.

[0046] Preparation Example 1

[0047] 0.2wt% of WSI inorganic particles and 99.3wt% of water were added to a foaming agent composed of 0.1wt% of lauryl glucoside, 0.1wt% of kochia scoparia saponin, 0.15wt% of tea saponin and 0.15wt% of Tween 40, and the whole was placed in a high-speed stirrer and stirred at a speed of 7000r / min for 3 minutes 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, wherein 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.

[0048] Preparation Example 2

[0049] 0.2wt% of WSI inorganic particles and 99.3wt% of water were added to a foaming agent composed of 0.2wt% of Kochia scoparia saponin, 0.15wt% of tea saponin and 0.15wt% of Tween 40, and the whole was placed in a high-speed stirrer and stirred at a speed of 7000r / 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, wherein 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] 0.2wt% of WSI inorganic particles and 99.3wt% of water were added to a foaming agent composed of 0.1wt% of lauryl glucoside, 0.1wt% of kochia scoparia saponin and 0.3wt% of tea saponin, and the whole was placed in a high-speed stirrer and stirred at a speed of 7000r / 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] 0.2wt% of WSI inorganic particles and 99.3wt% of water were added to a foaming agent composed of 0.2wt% of lauryl glucoside and 0.3wt% of Tween 40, and the whole was placed in a high-speed stirrer and stirred at a speed of 7000r / min for 3min to form a foam carrier A4. The stability of the foam carrier was determined by measuring the foaming volume and half-life at 25°C and 220°C, wherein 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] 0.2wt% of PR inorganic particles and 99.3wt% of water were added to a foaming agent composed of 0.1wt% of lauryl glucoside, 0.1wt% of kochia scoparia saponin, 0.15wt% of tea saponin and 0.15wt% of Tween 40, and the whole was placed in a high-speed stirrer and stirred at a speed of 7000r / min for 3min to form a foam carrier A5. The stability of the foam carrier was determined by measuring the foaming volume and half-life at 25°C and 220°C, wherein 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] 0.2 wt % of WSI inorganic particles and 99.3 wt % of water were added to a foaming agent containing 0.5 wt % of lauryl glucoside, and the whole was placed in a high-speed stirrer and stirred at a speed of 7000 r / min for 3 min to form a foam carrier B1. The stability of the foam carrier was determined by measuring the foaming 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 mixer 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 foaming 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 7000 r / min for 3 min to form a foam carrier B3. The stability of the foam carrier was determined by measuring the foaming 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 whole was placed in a high-speed mixer and stirred at a speed of 7000 r / min for 3 min to form a foam carrier B4. The stability of the foam carrier was determined by measuring the foaming 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 the temperature rises, the foaming volume and foam half-life of all foam carriers decrease. Among them, although the half-life of A1-A3 decreases significantly, they originally have a longer half-life at room temperature, so they still have obvious performance advantages even at high temperatures. A5 is a PR particle stabilized foam. The results show that PR has poor compatibility with the four-component compound system foaming agent. As a two-component compound system, A4 has slightly worse temperature stability than the three-component and four-component compound systems, but it still has 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 5wt% of the heavy oil modifier was added. The whole was placed in a high-speed stirrer and stirred at a speed of 7000r / min for 3 minutes to obtain the catalytic modification system C1. The foaming volume and half-life of the catalytic modification system at 25°C and 220°C were measured to determine the carrying stability of the foam carrier.

[0076] Example 2

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

[0078] Example 3

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

[0080] Example 4

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

[0082] Example 5

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

[0084] Comparative Example 1

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

[0086] Comparative Example 2

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

[0088] Comparative Example 3

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

[0090] Comparative Example 4

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

[0094] Table 3

[0095] Catalytic Modification 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 the catalytic modified system C1 is a compound system of lauryl glucoside, kochia saponin, tea saponin and Tween 40. The foam half-life after carrying the agent is much longer than that of other comparative examples, and the foaming volume is also larger. Therefore, the catalytic modified system C1 is not damaged by the addition of the oil phase modifier. Due to the introduction of the modifier, the half-life of the catalytic modified systems C2-C5 has decreased within a certain range, but compared with the comparative examples, the carrying stability of the catalytic modified systems C2-C5 is better than that of each comparative example.

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

[0098] The stability tests of the catalytic modification systems C1-C5 and D1-D4 were carried out at 25°C and 220°C 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 catalytic modification system is affected to varying degrees at high temperatures. C1, as the optimal system, has the best temperature resistance. For the C2 and C3 systems, their performance is slightly lower than that of C1, but compared with the comparative example, their stability still has certain advantages. The addition of the oil phase modifier destroys the stability of the foam carrier system, for example, D2 directly shows almost no foaming.

[0100] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope 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.

2. The foam carrier according to claim 1, characterized in that: The foaming agent is a compound of lauryl glucoside, kochia saponin, tea saponin and Tween 40; Preferably, relative to the total amount of the foam carrier, the lauryl glucoside is 0.1-0.15wt%, the kochia scoparia 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 0.3-0.5wt%, the inorganic particles account for 0.15-0.2wt%, and water accounts for 99.3-99.55wt%.

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

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

7. The foam carrier according to any one of claims 1 to 6, 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, preferably 30-38 min; Preferably, 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, preferably 15-22 min.

8. Use of the foam carrier according to any one of claims 1 to 7 in heavy oil production.

9. A catalytic reforming system for heavy oil steam recovery, characterized in that: The catalytic modification system comprises a modifying agent and a foam carrier as described in any one of claims 1 to 7.

10. The catalytic reforming system according to claim 9, characterized in that: Based on the total amount of the catalytic modification system, in the catalytic modification system, the modification agent is 5-8wt%, and the foam carrier is 92-95wt%; Preferably, the modifier is a solvent oil solution containing iron cyclohexaneate, wherein the iron content in the modifier is 5-7wt%, and the viscosity reduction rate of the modifier is more than 70%.

11. The catalytic reforming system according to claim 9 or 10, characterized in that: 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; Preferably, 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, preferably 14-20 min.

12. Use of the catalytic upgrading system according to any one of claims 9 to 11 in heavy oil production.

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