A kind of asphalt shale inhibitor and its preparation method and application

Abstract

The present invention relates to an asphalt shale inhibitor and a preparation method and application thereof, and relates to the technical field of shale inhibitors. The asphalt shale inhibitor comprises the following raw materials by weight: 40 to 55 parts of natural asphalt, 18 to 25 parts of petroleum asphalt, 8 to 15 parts of a modifier and 1 to 10 parts of a solubilizer; the modifier is prepared by using saponin powder, fly ash and a coupling agent in a weight ratio of (8 to 15): (3 to 6): (0.1 to 2). The asphalt shale inhibitor provided by the present invention uses natural asphalt as the main raw material and a small amount of petroleum asphalt, and adds a modifier and a solubilizer prepared by saponin powder, fly ash and a coupling agent in an appropriate proportion to improve the comprehensive modification effect of asphalt. When used to prepare water-based drilling fluid, excellent anti-collapse performance and good high temperature and high pressure filtration loss effect can be obtained, which provides a new idea for the preparation of asphalt shale inhibitors and has a wide range of practical application value.

Description

Technical Field

[0001] The present invention relates to the technical field of shale inhibitors, and in particular to an asphalt shale inhibitor and a preparation method and application thereof. Background Art

[0002] Shale inhibitors, commonly known as anti-collapse agents, are treatment agents used to inhibit the hydration, expansion, and decomposition of clay minerals contained in shale to prevent well collapse. Commonly used shale inhibitors include gypsum, silicates, lime, various potassium salts, ammonium salts, various asphalt products, and potassium, ammonium, and calcium salts of polymers.

[0003] At present, asphalt products in drilling fluid treatment agents include sulfonated asphalt, alkylated asphalt, cationic asphalt, emulsified asphalt, oxidized asphalt and asphalt blends prepared by one or more of them with surfactants, humic acids, etc., but when the above-mentioned asphalt shale inhibitors are applied to water-based drilling fluids, although they have excellent anti-collapse performance, the high-temperature and high-pressure filtration loss of the obtained drilling fluid is high, which cannot meet the use requirements of deep well operations. In addition, asphalt is divided into natural asphalt and synthetic asphalt. Natural asphalt exists in nature, but is rarely used nowadays. It is generally difficult to contact, and toxic substances can basically volatilize, so it is not harmful to the human body. Synthetic asphalt is the residue after coal tar or petroleum distillation (petroleum asphalt). It contains substances such as benzopyrene in the odor, which is highly toxic and has certain toxicity to the human body. It can cause human poisoning through the skin and respiratory tract, causing skin damage, respiratory damage, etc.

[0004] In view of this, it is very necessary to provide an asphalt shale inhibitor that meets the use requirements of deep well operations and is safer and more environmentally friendly. Summary of the invention

[0005] In order to solve the above problems, the present invention provides an asphalt shale inhibitor and a preparation method and application thereof.

[0006] In a first aspect, the present invention provides an asphalt shale inhibitor, which comprises the following raw materials in parts by weight:

[0007] 40-55 parts of natural asphalt, 18-25 parts of petroleum asphalt, 8-15 parts of modifier and 1-10 parts of solubilizer;

[0008] The modifier is prepared by using saponin powder, fly ash and coupling agent in a weight ratio of (8-15):(3-6):(0.1-2).

[0009] Furthermore, the weight ratio of the natural asphalt to the petroleum asphalt is 2.5:1.

[0010] Furthermore, the added weight of the modifier accounts for (0.15-0.20) of the total weight of the natural asphalt and the petroleum asphalt.

[0011] Furthermore, the asphalt shale inhibitor includes the following raw materials in parts by weight:

[0012] 50 parts of natural asphalt, 20 parts of petroleum asphalt, 12 parts of modifier and 7 parts of solubilizer.

[0013] Furthermore, the particle size of the soapberry powder is 300 mesh to 500 mesh; the fly ash is primary fly ash; the natural asphalt includes at least one of Xinjiang natural asphalt, Sichuan natural asphalt, Iranian natural rock asphalt and North American rock asphalt; the model of the petroleum asphalt includes at least one of No. 10, No. 70 and No. 90; the coupling agent includes at least one of a silane coupling agent, an aluminate coupling agent and a titanate coupling agent; the solubilizer includes at least one of a cycloalkyl rubber oil and an aromatic rubber oil.

[0014] In a second aspect, the present invention provides a method for preparing the asphalt shale inhibitor according to any one of the first aspects, the preparation method comprising the following steps:

[0015] The natural asphalt and petroleum asphalt are mixed and crushed, and then subjected to low-temperature plasma modification to obtain a composite asphalt material;

[0016] Adding saponin powder, fly ash and coupling agent into water, stirring and mixing, and then concentrating and drying to obtain a modifier;

[0017] The composite asphalt material and the solubilizer are heated and melted, and then the modifier is added and stirred while being kept warm to obtain the asphalt shale inhibitor.

[0018] Furthermore, the step of mixing and crushing natural asphalt and petroleum asphalt, and then performing low-temperature plasma modification to obtain a composite asphalt material includes the following process:

[0019] The natural asphalt and petroleum asphalt are mixed and crushed to obtain a mixture with a particle size of less than 5 mm;

[0020] The mixed material is added into a low-temperature plasma treatment device. When the vacuum degree in the device is adjusted to below 10Pa, oxygen is introduced at an oxygen flow rate of 35-45cm 3 / min and a power supply of 90-110W, low-temperature plasma modification is performed for 2-5 minutes to obtain the composite asphalt material.

[0021] Furthermore, the working parameters of the heat preservation and stirring include: a temperature of 160° C. to 245° C., a time of 15 to 30 minutes, and a stirring speed of 800 to 1200 rpm.

[0022] In a third aspect, the present invention provides the use of the asphalt shale inhibitor described in any one of the first aspect and / or the asphalt shale inhibitor prepared by the preparation method described in any one of the second aspect in oil and gas drilling.

[0023] In a fourth aspect, the present invention provides a drilling fluid, wherein the drilling fluid comprises the asphalt shale inhibitor described in any one of the first aspect and / or the asphalt shale inhibitor prepared by the preparation method described in any one of the second aspect.

[0024] The above technical solution provided by the embodiment of the present invention has at least the following advantages compared with the prior art:

[0025] The embodiment of the present invention provides an asphalt shale inhibitor, which mainly uses natural asphalt and a small amount of petroleum asphalt as the main raw materials, effectively reduces the content of harmful substances caused by petroleum asphalt, especially reduces the content of harmful substances such as benzopyrene in petroleum asphalt, and is more in line with the operating requirements of the "National Environmental Protection Standard of the People's Republic of China HJ892-2017". Modifiers and solubilizers prepared by using appropriate proportions of saponin powder, fly ash and coupling agents are added to improve the comprehensive modification effect of asphalt. When used to prepare water-based drilling fluid, excellent anti-collapse performance and good high temperature and high pressure filtration loss effect can be obtained, which provides a new idea for the preparation of asphalt shale inhibitors and has a wide range of practical application value. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0028] In a first aspect, the present invention provides an asphalt shale inhibitor, which comprises the following raw materials in parts by weight:

[0029] 40-55 parts of natural asphalt, 18-25 parts of petroleum asphalt, 8-15 parts of modifier and 1-10 parts of solubilizer;

[0030] The modifier is prepared by using saponin powder, fly ash and coupling agent in a weight ratio of (8-15):(3-6):(0.1-2).

[0031] The embodiment of the present invention provides an asphalt shale inhibitor, which mainly uses natural asphalt and a small amount of petroleum asphalt as the main raw materials, effectively reduces the content of harmful substances caused by petroleum asphalt, especially reduces the content of harmful substances such as benzopyrene in petroleum asphalt, and is more in line with the operating requirements of the "National Environmental Protection Standard of the People's Republic of China HJ892-2017". Modifiers and solubilizers prepared by using appropriate proportions of saponin powder, fly ash and coupling agents are added to improve the comprehensive modification effect of asphalt. When used to prepare water-based drilling fluid, excellent anti-collapse performance and good high temperature and high pressure filtration loss effect can be obtained, which provides a new idea for the preparation of asphalt shale inhibitors and has a wide range of practical application value.

[0032] In some specific embodiments, the asphalt shale inhibitor may be composed of only 40-55 parts of natural asphalt, 18-25 parts of petroleum asphalt, 8-15 parts of modifier and 1-10 parts of solubilizer, measured by weight; the modifier is prepared by using saponin powder, fly ash and coupling agent in a weight ratio of (8-15):(3-6):(0.1-2).

[0033] In some specific embodiments, the weight proportions of the natural asphalt may be 40 parts, 41 parts, 42 parts, 43 parts, 44 parts, 45 parts, 46 parts, 47 parts, 48 ​​parts, 49 parts, 50 parts, 51 parts, 52 parts, 53 parts, 54 parts, 55 parts, etc.

[0034] In some specific embodiments, the weight proportion of the petroleum asphalt may be 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, etc.

[0035] In some specific embodiments, the weight proportion of the modifier may be 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, etc.

[0036] In some specific embodiments, the weight proportion of the solubilizer may be 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, etc.

[0037] In some specific embodiments, the weight ratio of the sapodilla powder, fly ash and coupling agent is preferably 14:5:0.5.

[0038] In some specific embodiments, the weight ratio of the natural asphalt to the petroleum asphalt is 2.5:1.

[0039] In some specific embodiments, the added weight of the modifier accounts for (0.15-0.20) of the total weight of the natural asphalt and the petroleum asphalt; preferably 0.17.

[0040] In some specific embodiments, the particle size of the soapnut powder is 300-500 mesh; and the fly ash is primary fly ash.

[0041] In some specific embodiments, the natural asphalt includes at least one of Xinjiang natural asphalt, Sichuan natural asphalt, Iranian natural rock asphalt and North American rock asphalt; preferably Sichuan natural asphalt and Xinjiang natural asphalt, etc.

[0042] In some specific embodiments, the type of petroleum asphalt includes at least one of No. 10, No. 70 and No. 90; preferably, it is No. 70 petroleum asphalt.

[0043] In some specific embodiments, the coupling agent includes at least one of a silane coupling agent, an aluminate coupling agent and a titanate coupling agent; preferably a titanate coupling agent such as isopropyl dioleyl (dioctyl phosphate) titanate, isopropyl trioleyl titanate, monoalkoxy titanate coupling agent, etc.

[0044] In some specific embodiments, the solubilizing agent includes at least one of cycloalkyl rubber oil and aromatic rubber oil; specifically, cycloalkyl rubber oil of Kunlun brand KN4006.

[0045] In some specific embodiments, preferably, the asphalt shale inhibitor comprises the following raw materials in parts by weight:

[0046] 50 parts of natural asphalt, 20 parts of petroleum asphalt, 12 parts of modifier and 7 parts of solubilizer.

[0047] It should be noted that, unless otherwise specified or specified, the raw materials of the components involved in the asphalt shale inhibitor provided in the embodiments of the present invention can be directly commercially available products.

[0048] In a second aspect, based on a general inventive concept, the present invention provides a method for preparing the asphalt shale inhibitor according to any one of the first aspects, the preparation method comprising the following steps:

[0049] The natural asphalt and petroleum asphalt are mixed and crushed, and then subjected to low-temperature plasma modification to obtain a composite asphalt material;

[0050] Adding saponin powder, fly ash and coupling agent into water, stirring and mixing, and then concentrating and drying to obtain a modifier;

[0051] The composite asphalt material and the solubilizer are heated and melted, and then the modifier is added and stirred while being kept warm to obtain the asphalt shale inhibitor.

[0052] The preparation method provided in the embodiment of the present invention improves the comprehensive modification effect of asphalt by using low-temperature plasma modification for physical modification and combining chemical modification with a modifier prepared by using appropriate proportions of saponin powder, fly ash and coupling agent. When used in the preparation of water-based drilling fluid, excellent anti-collapse performance and good high temperature and high pressure filtration loss reduction effect can be obtained, providing a new idea for the preparation of asphalt shale inhibitors.

[0053] In some specific embodiments, the step of mixing and crushing natural asphalt and petroleum asphalt, and then performing low-temperature plasma modification to obtain a composite asphalt material includes the following process:

[0054] The natural asphalt and petroleum asphalt are mixed and crushed to obtain a mixture with a particle size of less than 5 mm;

[0055] The mixed material is added into a low-temperature plasma treatment device. When the vacuum degree in the device is adjusted to below 10Pa, oxygen is introduced at an oxygen flow rate of 35-45cm 3 / min and a power supply of 90-110W, low-temperature plasma modification is performed for 2-5 minutes to obtain the composite asphalt material.

[0056] In some specific embodiments, the working parameters of the heat preservation and stirring include: a temperature of 160° C. to 245° C., a time of 15 to 30 minutes, and a stirring speed of 800 to 1200 rpm.

[0057] In some specific embodiments, the amount of water added to obtain the modifier is sufficient to ensure that the saponin powder, fly ash and coupling agent can be fully stirred.

[0058] It should be noted that the operating steps involved in the preparation method of the asphalt shale inhibitor provided in the embodiment of the present invention, unless otherwise specified or explained, can be carried out in a conventional manner in the art or using existing equipment, and will not be described one by one here.

[0059] In a third aspect, based on a general inventive concept, the present invention provides the use of the asphalt shale inhibitor described in any one of the first aspect and / or the asphalt shale inhibitor prepared by the preparation method described in any one of the second aspect in oil and gas drilling.

[0060] The present invention provides a novel asphalt shale inhibitor, which can obtain excellent anti-collapse performance and better high temperature and high pressure filtration loss reduction effect when used in preparing water-based drilling fluid, and has wide practical application value.

[0061] In a fourth aspect, the present invention provides a drilling fluid, wherein the drilling fluid comprises the asphalt shale inhibitor described in any one of the first aspect and / or the asphalt shale inhibitor prepared by the preparation method described in any one of the second aspect.

[0062] The drilling fluid provided by the present invention is realized based on the asphalt shale inhibitor described in any one of the first aspects above, and therefore has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0063] The drilling fluid provided by the present invention can use existing known commonly used drilling fluids such as polysulfone drilling fluid as the base fluid, and then add 1 to 5 wt % of the asphalt shale inhibitor provided by the present invention.

[0064] In some specific embodiments, the asphalt shale inhibitor provided by the present invention can also be adaptively adopted according to the water-based drilling fluid formula disclosed in the prior art. For example, the drilling fluid includes the following components by weight: 1 part of montmorillonite, 100 parts of water, 20 parts of barite, 1 part of polyethylene glycol, and 5 parts of shale inhibitor; the shale inhibitor is the asphalt shale inhibitor described in any one of the first aspects, and / or the asphalt shale inhibitor prepared by the preparation method described in any one of the second aspects.

[0065] In some specific embodiments, the preparation of the drilling fluid provided by the present invention can be carried out according to conventional methods in the art or using existing equipment, which will not be described in detail here.

[0066] The present invention will be further described below in conjunction with specific examples. It should be understood that these examples are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. The experimental methods in the following examples that do not specify specific conditions are usually measured according to national standards. If there is no corresponding national standard, then the conditions recommended by the manufacturer are followed.

[0067] Example 1

[0068] This example provides an asphalt shale inhibitor, which includes the following raw materials, measured in parts by weight (each part by weight is 10g): 40 parts of natural asphalt (specifically, Xinjiang natural asphalt produced in Xinjiang with a softening point of 130°C to 160°C), 18 parts of petroleum asphalt (specifically, No. 70 petroleum asphalt), 8 parts of a modifier and 7 parts of a solubilizer (specifically, Kunlun brand KN4006 cycloalkyl rubber oil); the modifier is prepared by using saponin powder (specifically, saponin powder with a particle size of 300 mesh to 500 mesh), fly ash (specifically, primary fly ash) and a coupling agent (specifically, isopropyl trioleate titanate) in a weight ratio of 8:3:0.2.

[0069] The preparation method of the above-mentioned asphalt shale inhibitor comprises the following steps:

[0070] Step (1): natural asphalt and petroleum asphalt are mixed and crushed to obtain a mixture with a particle size of less than 5 mm; the mixture is added to a low-temperature plasma treatment device, and when the vacuum degree in the device is adjusted to below 10 Pa, oxygen is introduced, and the oxygen flow rate is 42 cm 3 / min and a power supply of 95W for 3 minutes to obtain the composite asphalt material;

[0071] Step (2): adding sapodilla powder, fly ash and a coupling agent to 40 parts by weight of water, stirring and mixing for 30 minutes, and then concentrating and drying under reduced pressure to a constant weight to obtain a modifier;

[0072] Step (3): heat and melt the composite asphalt material and solubilizer obtained in step (1), then add the modifier obtained in step (2), stir at 200° C. and 1000 rpm for 25 minutes, then cool and crush to obtain the asphalt shale inhibitor.

[0073] Example 2

[0074] This example provides an asphalt shale inhibitor, which differs from Example 1 only in that, in parts by weight (each part by weight is 10 g), the asphalt shale inhibitor includes the following raw materials: 55 parts of natural asphalt, 25 parts of petroleum asphalt, 15 parts of modifier and 10 parts of solubilizer, and the modifier is prepared by using saponin powder, fly ash and coupling agent in a weight ratio of 15:6:1; the remaining steps and parameters are the same.

[0075] Example 3

[0076] This example provides an asphalt shale inhibitor, which differs from Example 1 only in that the amount of natural asphalt is 45 parts and the amount of modifier is adjusted to 10 parts; the remaining steps and parameters are the same.

[0077] Example 4

[0078] This example provides an asphalt shale inhibitor, which is different from Example 1 only in that the modifier is prepared by using saponin powder, fly ash and coupling agent in a weight ratio of 14:5:0.5; the remaining steps and parameters are the same.

[0079] Example 5

[0080] This example provides an asphalt shale inhibitor, which differs from Example 1 only in that, in parts by weight (each part by weight is 10 g), the asphalt shale inhibitor includes the following raw materials: 50 parts of natural asphalt, 20 parts of petroleum asphalt, 12 parts of modifier and 7 parts of solubilizer, and the modifier is prepared by using saponin powder, fly ash and coupling agent in a weight ratio of 14:5:0.5; the remaining steps and parameters are the same.

[0081] Comparative Example 1

[0082] This example provides an asphalt shale inhibitor, which is different from Example 1 only in that the amount of natural asphalt is adjusted to 18 parts and the amount of petroleum asphalt is adjusted to 40 parts; the remaining steps and parameters are the same.

[0083] Comparative Example 2

[0084] This example provides an asphalt shale inhibitor, which is different from Example 1 only in that the modifier is saponin powder with a particle size of 300-500 meshes; the remaining steps and parameters are the same.

[0085] Comparative Example 3

[0086] This example provides an asphalt shale inhibitor, which is different from Example 1 only in that the modifier is primary fly ash; the remaining steps and parameters are the same.

[0087] Comparative Example 4

[0088] This example provides an asphalt shale inhibitor, which differs from Example 1 only in that step (1) is adjusted to: mixing and crushing natural asphalt and petroleum asphalt to obtain a composite asphalt material with a particle size of less than 5 mm; the remaining steps and parameters are the same.

[0089] Test Case

[0090] This example tests the effects of the asphalt shale inhibitors provided in Examples 1 to 5 and Comparative Examples 1 to 4, including the following process:

[0091] 1. Preparation of water-based drilling fluid: Referring to the prior art, a water-based drilling fluid is prepared according to the following weight proportions: 1 part of montmorillonite, 100 parts of water, 20 parts of barite, 1 part of polyethylene glycol, and 5 parts of shale inhibitor; wherein the shale inhibitors are asphalt shale inhibitors provided in Examples 1 to 5 and Comparative Examples 1 to 4, respectively, and are recorded as water-based drilling fluid 1 (prepared using the asphalt shale inhibitor provided in Example 1), water-based drilling fluid 2 (prepared using the asphalt shale inhibitor provided in Example 2), water-based drilling fluid 3 (prepared using the asphalt shale inhibitor provided in Example 3), and water-based drilling fluid 4 (prepared using the asphalt shale inhibitor provided in Example 4). ), water-based drilling fluid 4 (prepared using the asphalt shale inhibitor provided in Example 4), water-based drilling fluid 5 (prepared using the asphalt shale inhibitor provided in Example 5), water-based drilling fluid 6 (prepared using the asphalt shale inhibitor provided in Comparative Example 1), water-based drilling fluid 7 (prepared using the asphalt shale inhibitor provided in Comparative Example 2), water-based drilling fluid 8 (prepared using the asphalt shale inhibitor provided in Comparative Example 3), and water-based drilling fluid 9 (prepared using the asphalt shale inhibitor provided in Comparative Example 4).

[0092] 2. The performance tests were performed on water-based drilling fluid test samples 1 to 9 obtained by using the asphalt shale inhibitors provided in Examples 1 to 5 and Comparative Examples 1 to 4, respectively: the high-temperature and high-pressure filtration loss of the water-based drilling fluid test samples at 150° C. and a pressure difference of 3.45 MPa was measured according to the method specified in GB / T 16783.1; the shale expansion rate of the water-based drilling fluid test samples was measured using a shale expansion meter. The test results are shown in Table 1.

[0093] Table 1

[0094]

[0095]

[0096] As shown in Table 1, the asphalt shale inhibitor provided by the present invention, when used to prepare water-based drilling fluid, not only has excellent anti-collapse performance, which is beneficial to well wall reinforcement, but also has a good effect of reducing high temperature and high pressure filtration loss, which can meet the use requirements of deep well operations. At the same time, compared with the comparative example, the asphalt shale inhibitor provided by the embodiment of the present invention has better performance.

[0097] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An asphalt shale inhibitor, characterized in that: The asphalt shale inhibitor includes the following raw materials in parts by weight: 40-55 parts of natural asphalt, 18-25 parts of petroleum asphalt, 8-15 parts of modifier and 1-10 parts of solubilizer; The modifier is prepared by using sapodilla powder, fly ash and coupling agent in a weight ratio of (8-15): (3-6): (0.1-2); The preparation method of the asphalt shale inhibitor comprises the following steps: The natural asphalt and petroleum asphalt are mixed and crushed, and then subjected to low-temperature plasma modification to obtain a composite asphalt material; Adding saponin powder, fly ash and coupling agent into water, stirring and mixing, and then concentrating and drying to obtain a modifier; The composite asphalt material and the solubilizer are heated and melted, and then the modifier is added and stirred while being kept warm to obtain the asphalt shale inhibitor.

2. The asphalt shale inhibitor according to claim 1, characterized in that: The weight ratio of the natural asphalt to the petroleum asphalt is 2.5:

1.

3. The asphalt shale inhibitor according to claim 1, characterized in that: The added weight of the modifier accounts for (0.15-0.20) of the total weight of the natural asphalt and the petroleum asphalt.

4. The asphalt shale inhibitor according to claim 1, characterized in that: The asphalt shale inhibitor includes the following raw materials in parts by weight: 50 parts of natural asphalt, 20 parts of petroleum asphalt, 12 parts of modifier and 7 parts of solubilizer.

5. The asphalt shale inhibitor according to claim 1, characterized in that: The particle size of the soapnut powder is 300 mesh to 500 mesh; the fly ash is first-grade fly ash; the natural asphalt includes at least one of Xinjiang natural asphalt, Sichuan natural asphalt, Iranian natural rock asphalt and North American rock asphalt; the model of the petroleum asphalt includes at least one of No. 10, No. 70 and No. 90; the coupling agent includes at least one of a silane coupling agent, an aluminate coupling agent and a titanate coupling agent; the solubilizer includes at least one of a cycloalkyl rubber oil and an aromatic rubber oil.

6. The asphalt shale inhibitor according to claim 1, characterized in that: The step of mixing and crushing natural asphalt and petroleum asphalt, and then performing low-temperature plasma modification to obtain a composite asphalt material comprises the following process: The natural asphalt and petroleum asphalt are mixed and crushed to obtain a mixture with a particle size of less than 5 mm; The mixed material is added into a low-temperature plasma treatment device. When the vacuum degree in the device is adjusted to below 10Pa, oxygen is introduced at an oxygen flow rate of 35-45cm 3 / min and a power supply of 90-110W, low-temperature plasma modification is performed for 2-5 minutes to obtain the composite asphalt material.

7. The asphalt shale inhibitor according to claim 1, characterized in that: The working parameters of the heat preservation and stirring include: temperature of 160° C. to 245° C., time of 15 to 30 minutes, and stirring speed of 800 to 1200 rpm.

8. Use of the asphalt shale inhibitor according to any one of claims 1 to 7 in oil and gas drilling.

9. A drilling fluid, characterized in that: The drilling fluid contains the asphalt shale inhibitor according to any one of claims 1 to 7.

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