While-drilling anti-sloughing plugging agent for fractured stratum and preparation and application method thereof

Abstract

The invention relates to a while-drilling anti-collapse plugging agent for fractured stratums and a preparation and application method thereof, and belongs to the technical field of oil and gas drilling. The water-based drilling fluid comprises the following components: an intelligent response type hydrogel material, a nanopore adsorption material, a degradable microcapsule plugging material, an enhanced fiber material, a microencapsulated phase change material, a high-strength inorganic particle reinforcing agent, a rheology control agent and water or water-based drilling fluid. The preparation and application method comprises the following steps: mixing the intelligent response type hydrogel material, the enhanced fiber material and the nanopore adsorption material dry powder; adding the dry powder material into water or a water-based drilling fluid to form a solution; adding a degradable microcapsule plugging material and a microencapsulated phase change material into the solution; and adding the rheology control agent and the high-strength inorganic particles, and uniformly stirring to obtain the anti-collapse plugging agent while drilling. And entering formation fractures while drilling. The plugging agent has remarkable flowability, cohesiveness and durability, can adapt to cracks of different sizes of complex fractured stratums, and is high in plugging success rate.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil and gas drilling, and relates to a downhole anti-collapse and leakage plugging agent for fracturing formations and a preparation and application method thereof. Background Art

[0002] In the field of oil and gas exploration and development, drilling operations often face challenges of complex geological conditions, among which fractured formations have become a major problem. The structure of fractured formations is unstable, and during the drilling process, the drilling fluid is extremely prone to leakage, and at the same time, the problem of wellbore instability occurs frequently. This situation not only greatly increases the risk of downhole sticking and burying of the drill, but also significantly increases the difficulty of hitting the target during drilling, seriously restricting the effective development of oil and gas resources.

[0003] Currently, for the problems of leakage and wellbore instability in drilling fractured formations, although conventional downhole leakage plugging agents have certain applications, there are many limitations. Common treating agents such as walnut shells, calcite, and fibers are prone to cause the "blocking" phenomenon in actual use. Once "blocked", the drilling fluid circulation channel is blocked, which will seriously affect the normal progress of drilling operations. In addition, the temperature resistance of these traditional leakage plugging agents is poor, and in a high-temperature formation environment, their performance will decline sharply, resulting in a low success rate of leakage plugging and being difficult to meet the requirements of efficient drilling under complex geological conditions.

[0004] From the perspective of the industry status quo, most of the research on leakage plugging agents focuses on the improvement of traditional materials, and there is a serious lack of exploration of new materials and new technologies. Especially in the aspects of intelligent leakage plugging agents and ecological materials, the number of related patents is scarce and the technological development is relatively lagging. Intelligent leakage plugging agents have the ability to automatically adjust their performance according to formation conditions and can achieve precise leakage plugging; ecological materials have advantages such as environmental protection and degradability, meeting the requirements of sustainable development. However, at present, no breakthrough progress has been made in these two aspects of research.

[0005] The characteristics of fractured formations themselves further exacerbate the difficulty of drilling operations. The instability of its structure leads to frequent problems of borehole collapse and fluid leakage during the drilling process. Borehole collapse not only damages drilling equipment, but also causes waste of drilling fluid and formation pollution; fluid leakage will cause imbalance of drilling fluid pressure, affect wellbore stability, and increase the probability of downhole accidents. Although existing anti-collapse and leakage plugging agents can alleviate these problems to a certain extent, they mainly focus on the improvement of traditional materials and lack in-depth research on new high-performance materials and their composite applications.

[0006] The novel high-performance materials have excellent physical and chemical properties, such as high strength, high toughness, good temperature resistance and chemical stability, etc. By applying these materials in combination, their respective advantages can be fully utilized to achieve a synergistic effect and improve the comprehensive performance of the anti-collapse and plugging agent. For example, combining nanomaterials with traditional plugging materials can enhance the sealing performance and durability of the plugging agent; using intelligent responsive materials enables the plugging agent to automatically adjust its performance according to changes in formation temperature, pressure and other parameters, realizing intelligent plugging.

[0007] In order to solve the deficiencies in the existing technology and promote the development of the oil and gas exploration and development industry, it is urgently necessary to develop a drill-in anti-collapse and plugging agent with multifunctional and long-term anti-collapse and plugging capabilities. Summary of the Invention

[0008] In view of this, the purpose of the present invention is to provide a drill-in anti-collapse and plugging agent for fractured formations and its preparation and application method to address the major challenges faced by fractured formations during oil and gas exploration and drilling.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] A drill-in anti-collapse and plugging agent for fractured formations, comprising the following components and their corresponding weight ratios: 15-30 parts of intelligent responsive hydrogel material, 5-15 parts of nanoporous adsorption material, 8-20 parts of degradable microcapsule plugging material, 10-25 parts of enhanced fiber material, 2-6 parts of microencapsulated phase change material, 10-20 parts of high-strength inorganic particle enhancer, and 3-8 parts of rheology control agent.

[0011] Optionally, it further includes water-based drilling fluid or water.

[0012] Optionally, the number of parts of the water-based drilling fluid or water, when added to the total number of parts of the foregoing materials, is equal to 100 parts.

[0013] Optionally, the intelligent responsive hydrogel material is a temperature-responsive polyacrylamide-based gel.

[0014] Optionally, the nanoporous adsorption material is nano-calcium carbonate.

[0015] Optionally, the degradable microcapsule plugging material is poly(lactic-co-glycolic acid) (PLGA) or polycaprolactone (PCL).

[0016] Optionally, the enhanced fiber material is a high-performance polymer fiber.

[0017] Optionally, the microencapsulated phase change material is sodium carbonate phase change microcapsules.

[0018] Optionally, the rheology control agent is hydroxypropyl methylcellulose HPMC.

[0019] A preparation and application method of any one of the above-mentioned anti-collapse and leakage plugging agents for formation breaking during drilling, comprising the following steps:

[0020] S1. Dry mixing:

[0021] Dry mix the intelligent responsive hydrogel material, enhanced fiber material and nanoporous adsorption material until evenly mixed;

[0022] S2. Solution preparation:

[0023] Add the dry powder material into water or water-based drilling fluid and stir until completely and evenly dispersed;

[0024] S3. Add the degradable microcapsule plugging material and microencapsulated phase change material into the solution and continue to stir until all materials are evenly distributed;

[0025] S4. Rheology control: Add the rheology control agent and high-strength inorganic particles and stir until completely uniform to obtain the above-mentioned anti-collapse and leakage plugging agent during drilling;

[0026] S5. Inject the anti-collapse and leakage plugging agent into the wellbore through the drilling fluid circulation system or mud pump and enter the formation fractures during drilling.

[0027] The beneficial effects of the present invention are as follows:

[0028] The purpose of the present invention is to provide a formula for anti-collapse and leakage plugging agent during drilling, which can adapt to the drilling operation in complex fractured formations and has comprehensive functions of high-efficiency anti-collapse, leakage plugging and wellbore stabilization. Through the synergistic effect of intelligent responsive materials, nano-enhanced materials and high-strength inorganic particle materials, it is ensured that the plugging agent can play a role in real time during the drilling process, improving the efficiency and safety of the drilling operation; at the same time, it can adaptively change to different sizes of fractures in the wellbore, greatly improving the success rate of leakage plugging.

[0029] Its beneficial effects:

[0030] (1) By introducing nanomaterials, the specific surface area and reaction activity of the plugging agent are greatly improved, which can quickly fill microfractures and pores, effectively prevent fluid leakage, and enhance formation stability; through the strengthening effect and intelligent response mechanism of nanoparticles, the fluidity, adhesiveness and persistence of the plugging agent are significantly improved;

[0031] (2) By adopting intelligent material design, the plugging agent can automatically adjust its physical properties according to changes in the external environment. Through the above innovations, the anti-collapse and leakage plugging agent during drilling of the present invention will improve the operation efficiency while ensuring safety, and promote the green transformation of the oil and gas industry.

[0032] Other advantages, objects, and features of the present invention will be set forth in part in the following description, and in part will be obvious to those skilled in the art upon examination of the following, or may be learned by practice of the present invention. The objects and other advantages of the present invention may be realized and obtained by the following description of the specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described in detail preferably with reference to the accompanying drawings, where:

[0034] Figure 1 It is a flowchart for the preparation application method. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] The following specific examples illustrate the embodiments of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0036] Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as limiting the present invention; in order to better illustrate the embodiments of the present invention, some components in the drawings will be omitted, enlarged, or reduced, and do not represent the dimensions of actual products; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0037] In the drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0038] The present invention provides a downhole anti-collapse and plugging agent for fractured formations, which includes the following components and their corresponding weight ratios: 15 - 30 parts of intelligent response hydrogel material, 5 - 15 parts of nanoporous adsorption material, 8 - 20 parts of degradable microcapsule plugging material, 10 - 25 parts of enhanced fiber material, 2 - 6 parts of microencapsulated phase change material, 10 - 20 parts of high-strength inorganic particle enhancer, and 3 - 8 parts of rheology control agent. It also includes water-based drilling fluid or water; the number of parts of water-based drilling fluid or water, when added to the total number of parts of the foregoing materials, equals 100 parts.

[0039] The intelligent response hydrogel material is a temperature-responsive polyacrylamide-based gel. As the core functional material, it has temperature-responsive characteristics; it can automatically adjust its volume according to the formation temperature change (such as swelling at high temperatures), fill the cracks in real time and form a tight plugging layer; enhance the adhesion and deformation ability of the plugging agent to adapt to cracks of different sizes; a high proportion of hydrogel can significantly improve the plugging effect.

[0040] The nanoporous adsorption material is nano-calcium carbonate. The present invention utilizes the nano-scale pores and high specific surface area characteristics to adsorb fluids and fill micro-cracks, quickly adsorb free water in the drilling fluid, reduce leakage; fill the tiny pores in the formation (such as nano-scale cracks), improve the overall stability of the formation; and cooperate with the enhanced fiber to form a dense network structure.

[0041] The degradable microcapsule plugging material is poly(lactic-co-glycolic acid) (PLGA) or polycaprolactone (PCL). It gradually releases the plugging agent through degradation to achieve long-term plugging. The microcapsule shell slowly degrades during the drilling process, releasing the internal plugging core components (such as plugging agents or reactive substances); extending the plugging timeliness (such as in Example 3, a high proportion of microcapsule materials improves the persistence); avoiding the "sealing door" phenomenon caused by one-time release and adapting to the dynamic drilling environment.

[0042] The enhanced fiber material is a high-performance polymer fiber. It provides mechanical support and tensile strength. It forms a three-dimensional network structure in the plugging layer, enhancing the anti-shear and anti-extrusion capabilities; preventing crack propagation (such as in Example 2, a high fiber proportion improves the toughness); improving the adaptability of the plugging agent in fractured formations and reducing the risk of wellbore collapse.

[0043] The microencapsulated phase change material is sodium carbonate phase change microcapsule. It adjusts the physical state and energy absorption through the phase change process. When undergoing a phase change, it absorbs or releases heat, buffering the impact of temperature fluctuations on the performance of the plugging agent; the volume change helps to adjust the density of the plugging layer; enhancing the stability of the material under complex temperature and pressure conditions.

[0044] The high-strength inorganic particle enhancer: provides mechanical strength and compressive capacity. It fills large-size cracks, forms a rigid support structure; improves the compressive strength of the plugging layer; prevents the plugging layer from cracking under high pressure, ensuring wellbore stability.

[0045] The rheology control agent is hydroxypropyl methylcellulose (HPMC). It regulates the rheological properties of the drilling fluid, optimizes the fluidity of the lost circulation material to ensure uniform dispersion during the pumping process, maintains suspension stability at rest to prevent particle settlement or stratification (e.g., the low-proportion rheology agent in Example 4 still maintains excellent fluidity), and enhances the adaptability of the lost circulation material at different shear rates.

[0046] The above components achieve a comprehensive anti-collapse and lost circulation prevention effect through functional complementarity. For example, the intelligent hydrogel and phase change material respond to environmental changes, the nano-materials and fibers fill the cracks and enhance the mechanical properties, the microcapsule material extends the lost circulation prevention time, the high-strength particles and inorganic additives ensure mechanical stability, and the rheology agent optimizes the construction performance. This multi-component collaborative design significantly improves the adaptability and reliability of the lost circulation material in fractured formations.

[0047] Please refer to Figure 1 , a preparation and application method of a drilling-fluid-loss prevention and anti-collapse agent for fractured formations, comprising the following steps:

[0048] S1. Dry mixing:

[0049] Dry mix the intelligent response hydrogel material, enhanced fiber material, and nano-porous adsorption material until evenly mixed;

[0050] S2. Solution preparation:

[0051] Add the dry powder material into water or a water-based drilling fluid and stir until completely and evenly dispersed;

[0052] S3. Add the degradable microcapsule plugging material and microencapsulated phase change material to the solution and continue stirring until all materials are evenly distributed.

[0053] S4. Rheology control: Add the rheology control agent and high-strength inorganic particles and stir until completely uniform to obtain the aforementioned drilling-fluid-loss prevention and anti-collapse agent;

[0054] S5. Inject the anti-collapse and lost circulation prevention agent into the wellbore through the drilling fluid circulation system or mud pump, and enter the formation cracks while drilling. Inject the anti-collapse and lost circulation prevention agent into the wellbore through the drilling fluid circulation system or mud pump, and enter the formation cracks while drilling, playing the role of anti-collapse and lost circulation prevention. According to the changes in downhole formation pressure and temperature, the intelligent response hydrogel material and phase change material will automatically respond to form a dense plugging layer, enhancing the stability of the formation. The degradable microcapsule material gradually releases the core plugging components during the drilling process to achieve a long-lasting plugging effect and prevent the collapse of the wellbore wall.

[0055] Example 1

[0056] Dry-mix 20% hydrogel material, 15% reinforcing fiber material, and 10% nanoporous adsorption material to ensure uniformity; gradually add the dry-mixed powder to the water-based drilling fluid while maintaining high-speed stirring until it is evenly dispersed; slowly add 15% degradable microcapsules and 4% microencapsulated phase change material, and continue stirring; add 5% rheology control agent and 15% high-strength inorganic particles, make up the water to 100%, and stir until completely uniform; inject it in real time through the drilling fluid circulation system, and use the intelligent responsiveness of the material to form a stable plugging layer.

[0057] This formulation effectively enhances the anti-collapse performance in high-temperature and high-pressure environments. The intelligent responsiveness of the hydrogel material enables it to rapidly expand when the temperature changes, forming a strong plugging structure.

[0058] Example 2

[0059] Dry-mix 25% hydrogel, 20% reinforcing fiber, and 8% nanoporous material evenly; slowly add the mixture to water and stir at low speed until completely dispersed; slowly add 12% degradable microcapsules and 5% phase change material to ensure uniform distribution; add 5% rheology control agent and 10% high-strength inorganic particles, make up the water to 100%, and continue stirring until uniform; inject through a mud pump, and the hydrogel material forms a sealing plugging layer with temperature changes.

[0060] By adding a high proportion of enhanced fiber materials, this formulation improves the overall toughness, can maintain good stability in fractured formations, and effectively prevents collapse and leakage.

[0061] Example 3

[0062] Mix 30% hydrogel, 10% reinforcing fiber, and 5% nanoporous material; gradually add the mixture to water and stir at low speed until uniform; slowly add 20% degradable microcapsules and 3% phase change material, and continue stirring; add 5% rheology control agent and 20% high-strength inorganic particles, make up the water to 100%, and stir until completely uniform; inject during drilling operations, and the intelligent responsiveness of the material provides a lasting plugging effect under changing formation conditions.

[0063] This example focuses on increasing the proportion of the degradable microcapsule plugging material, which can release the plugging agent after contacting water, effectively fill the pores, and improve the leak resistance effect.

[0064] Example 4

[0065] Dry mix 15% hydrogel, 25% reinforcing fibers, and 15% nanoporous material; gradually add the dry mix to water and stir at low speed until evenly dispersed; slowly add 10% degradable microcapsules and 2% phase change material to ensure uniform distribution; finally add 3% rheology control agent and 10% high-strength inorganic particles, make up water to 100%, and continue stirring; during drilling operations, inject through the circulation system, and the material responds to formation changes in real time to ensure the plugging effect.

[0066] This formulation significantly improves the tensile strength of the material by increasing the proportion of the reinforcing fiber material, and is suitable for use under formation conditions with higher requirements.

[0067] Example 5

[0068] Dry mix 18% hydrogel, 10% reinforcing fibers, and 12% nanoporous material evenly; gradually add the dry mix powder to water and stir at low speed until completely dispersed; slowly add 15% degradable microcapsules and 6% phase change material to ensure uniform distribution; add 4% rheology control agent and 15% high-strength inorganic particles, make up water to 100%, and stir until completely homogeneous; inject in real time through the drilling fluid circulation system, and utilize the intelligent responsiveness of the material to ensure formation stability.

[0069] The focus of this example lies in the high proportion of the hydrogel material, which can quickly respond to environmental changes and form an efficient plug, and is suitable for scenarios of rapid construction and dealing with emergencies.

[0070] Table 1 Test Results Table

[0071]

[0072]

[0073] In Table 1, fluidity refers to the fluidity of the anti-collapse and plugging agent during mixing and application; stability refers to the stability of the anti-collapse and plugging agent under environmental changes; the plugging effect represents the plugging ability of the anti-collapse and plugging agent to formation fractures in actual application; durability reflects the time for the anti-collapse and plugging agent to maintain the plugging effect during use.

[0074] Based on the test results of the above five examples, the following conclusions are obtained:

[0075] 1. Influence of formulation ratio on performance

[0076] A high proportion of intelligent responsive hydrogel materials (such as 20% in Example 1, 25% in Example 2, 30% in Example 3) significantly improves the plugging effect. Especially in high-temperature and high-pressure environments (Example 1), it can quickly expand to form a sealing plugging layer. However, too high a proportion (such as 30% in Example 3) may reduce fluidity and durability, and it is necessary to balance the response speed and other properties.

[0077] A high proportion of enhanced fiber materials (such as 20% in Example 2 and 25% in Example 4) significantly improves stability and tensile strength and is suitable for highly stressed fractured formations. However, if the fiber proportion is too high (such as 25% in Example 4), it may slightly reduce fluidity and needs to be adjusted according to construction conditions.

[0078] A high proportion of degradable microcapsule plugging materials (such as 20% in Example 3 and 20% in Example 4) can extend persistence, but excessive amounts may lead to insufficient initial plugging (the "medium" persistence in Example 3), and the release rate needs to be synergistically optimized with intelligent materials.

[0079] Increasing the proportion of microencapsulated phase change materials (such as 6% in Example 5) can enhance the temperature response ability, improve stability and the ability to adjust the density of the plugging layer, but the proportion needs to be controlled to avoid excessive phase change affecting fluidity.

[0080] A high proportion of high-strength inorganic particles (such as 20% in Example 3) can significantly improve the compressive strength (the plugging effect is "good"), but it may increase the risk of material settlement.

[0081] A low proportion of rheology control agent (such as 3% in Example 4) can still maintain "excellent" fluidity, indicating the high-efficiency rheology regulation ability of HPMC, but uniform dispersion needs to be ensured.

[0082] 2. Comprehensive technical effects

[0083] The technical effect of the anti-collapse and leakage plugging agent of the present invention has high-efficiency plugging ability. By utilizing the synergistic effect of the swelling property of the intelligent hydrogel and the microcrack filling of the nanomaterial, a fast and dense plugging layer is achieved, and it performs outstandingly under high temperature and high pressure; it can adapt to complex environments. The intelligent response-type materials (hydrogel + phase change material) can dynamically adjust the physical state of the plugging agent to adapt to the temperature and pressure fluctuations in the wellbore. The nanoporous adsorption material effectively adsorbs free water, reduces leakage and enhances formation stability; the degradable microcapsule material (PLGA / PCL) realizes long-term plugging and avoids the "door sealing" phenomenon; the combination of the phase change material and the fiber network extends the mechanical stability of the plugging layer; the rheology control agent (HPMC) optimizes the fluidity, ensures uniform pumping of the plugging agent, and reduces construction resistance. The synergistic effect of the high-strength inorganic particles and the fiber material ensures the anti-rupture ability of the plugging layer under high pressure.

[0084] The anti-collapse and leakage plugging agent of the present invention achieves the technical effects of high-efficiency plugging, dynamic response, and long-term stability through multi-component collaborative design, and is particularly suitable for the while-drilling operation in complex fractured formations. Different formulations can be flexibly adjusted according to specific geological conditions and engineering requirements, significantly reducing the drilling risk while ensuring the stability of the wellbore, and promoting the oil and gas industry to develop in the direction of high efficiency and greenness.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the present technical solution, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A collapse prevention and lost circulation material while drilling for fracturing formations, characterized in that: It comprises the following components and their corresponding weight ratios: 15-30 parts of intelligent responsive hydrogel material, 5-15 parts of nanoporous adsorption material, 8-20 parts of degradable microcapsule plugging material, 10-25 parts of enhanced fiber material, 2-6 parts of microencapsulated phase change material, 10-20 parts of high-strength inorganic particle enhancer, and 3-8 parts of rheology control agent.

2. The anti-collapse and plugging agent while drilling for breaking formation according to claim 1, wherein: It also includes water-based drilling fluid or water.

3. The anti-collapse and leakage plugging agent while drilling for fracturing formations according to claim 2, wherein: The parts of the water-based drilling fluid or water, when added to the sum of the parts of the foregoing materials, equal 100 parts.

4. The anti-collapse and plugging agent while drilling for formation breaking according to claim 1, wherein: The intelligent responsive hydrogel material is a temperature-responsive polyacrylamide-based gel.

5. The anti-collapse and leakage plugging agent while drilling for formation breaking according to claim 1, characterized in that: The nanoporous adsorption material is nano calcium carbonate.

6. The anti-collapse and leakage plugging agent while drilling for fracturing formation according to claim 1, characterized in that: The degradable microcapsule plugging material is poly(lactic-co-glycolic acid) (PLGA) or polycaprolactone (PCL).

7. The anti-collapse and leakage plugging agent while drilling for fracturing formation according to claim 1, characterized in that: The enhanced fiber material is a high-performance polymer fiber.

8. The anti-collapse and plugging agent while drilling for fracturing formation according to claim 1, wherein: The microencapsulated phase change material is sodium carbonate phase change microcapsule.

9. The anti-collapse and plugging agent while drilling for fracturing formation according to claim 1, wherein: The rheology control agent is hydroxypropyl methylcellulose HPMC.

10. A preparation application method of the anti-collapse and plugging agent while drilling for fracturing formations according to any one of claims 1-9, characterized in that: It comprises the following steps: S1. Dry mixing: Dry mix the intelligent responsive hydrogel material, enhanced fiber material and nanoporous adsorption material until evenly mixed; S2. Solution preparation: Add the dry powder materials into water or water-based drilling fluid and stir until completely and evenly dispersed; S3. Add the degradable microcapsule plugging material and microencapsulated phase change material into the solution and continue to stir until all materials are evenly distributed; S4. Rheology control: Add the rheology control agent and high-strength inorganic particles and stir until completely uniform to obtain the anti-collapse and plugging agent while drilling for fracturing formations according to any one of claims 1-9; S5. Inject the anti-collapse and plugging agent into the wellbore through the drilling fluid circulation system or mud pump and enter the formation fractures while drilling.

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