High-temperature-resistant clean solid-free particle type temporary plugging liquid
By preparing a solid-free particulate temporary plugging fluid containing specific copolymer materials, the problem of insufficient stability of conventional temporary plugging fluids at high temperatures was solved, achieving a temporary plugging effect with adjustable density at high temperatures, reducing reservoir damage, and ensuring smooth construction.
Patent Information
- Application Number
- CN202510955247.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-11
- Publication Date
- 2025-10-28
AI Technical Summary
Existing conventional chemical plugging fluids lack stability at high temperatures, making it difficult to meet the downhole construction requirements of deep oil and gas reservoirs. They are also prone to causing reservoir damage, failing to effectively isolate the reservoir, and affecting subsequent production capacity release.
A solid-free particulate temporary plugging fluid is used. By adding copolymer materials containing carboxyl groups, zwitterions, sulfonic acid groups, hydroxyl groups and amide groups, a three-dimensional network structure of particles is formed. These particles can absorb brine and expand at high temperatures. A crosslinking agent is added to enhance the crosslinking strength, thus preparing a temporary plugging fluid with adjustable density to prevent leakage and reservoir damage.
It maintains stability at 160℃, has adjustable density, can effectively temporarily plug downhole operations, reduce reservoir damage, adapt to most working environments, and ensure the smooth completion of operations.
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Figure CN120843073A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of oilfield chemical technology, specifically relating to a high-temperature resistant, clean, solid-free particulate temporary plugging fluid. Background Technology
[0002] The development of deep and ultra-deep oil and gas reservoirs is the mainstay of future oil and gas production. The high-temperature environment of deep reservoirs poses severe challenges to downhole working fluids. Conventional chemical plugging fluids typically have a temperature resistance limit of 140℃, making them ineffective at isolating the reservoir during perforation and production tubing runs, failing to meet the plugging requirements of high-temperature wells, and prone to filtration loss and water lock damage within the reservoir. Currently, deep well formation temperatures are generally between 120 and 160℃, with high total formation water salinity and complex reservoir geological conditions, characterized by low porosity, low permeability, and strong heterogeneity. The high-temperature deep reservoirs and complex wellbore environment lead to insufficient stability and poor plugging effects of conventional plugging technologies. Furthermore, high-flow-rate circulation during well completion causes leakage in the open hole section, easily resulting in water lock, which is detrimental to subsequent flowback and production release, posing further challenges to well completion plugging processes.
[0003] Superabsorbent polymer (SAP) particles possess excellent water absorption and retention properties, making them a promising candidate for temporary plugging materials. They are hydrophilic polymer networks that utilize cross-linking to create an elastic structure. Common polymerization methods for preparing SAP include bulk polymerization, solution polymerization, and suspension polymerization. Monomers, initiators, and cross-linking agents are the three components in SAP preparation. The reaction is generally carried out in aqueous solutions or other solute media to control the heat of polymerization and the properties of the SAP. After the reaction, the obtained SAP sample needs to be washed to remove residual unreacted impurities or by-products. In 2015, Zhang Zhongliang et al. proposed a novel cross-linked temporary plugging workover fluid. This workover fluid can protect the reservoir from external fluid contamination, withstand temperatures up to 120℃, and has strong pressure-resistant temporary plugging capabilities. Furthermore, the on-site operation process is simple, requires small preparation quantities, and reduces operating costs. (Zhang Zhongliang, Xu Anguo. Application of cross-linked temporary plugging workover fluid in Bohai Oilfield [J]. Inner Mongolia Petroleum and Chemical Industry, 2015, (13): 16-18.)
[0004] In 2019, Shen Sihong et al. prepared salt-resistant superabsorbent resins using natural sodium alginate as raw material and two reaction systems, acrylic acid and chitosan, respectively. The study found that the acrylic acid-containing superabsorbent resin had a slightly higher salt water absorption rate than the pure water absorption rate. Both superabsorbent resins were derived from natural products, offering environmental advantages. Furthermore, the acrylic acid-containing superabsorbent resin exhibited a higher salt water absorption rate than the pure water absorption rate, demonstrating excellent salt resistance. (Shen Sihong, Qiu Qiankun, Shen Zhenli, et al. Preparation and water absorption properties of salt-resistant superabsorbent resins [J]. Journal of Environment and Health, 2019, 36(06):544-547.)
[0005] In 2020, Liu et al. studied the properties of nanocomposite membranes composed of carboxymethyl cellulose, cellulose nanofibers, and silica. Carboxymethyl cellulose can be used as a thickener and flotation agent; however, it is prone to rapid degradation at high temperatures. (Liu, Jianxin, et al. "Nanocomposites membranes from cellulose nanofibers, SiO2 and carboxymethyl cellulose with improved properties." Carbohydrate Polymers 233(2020):115818.)
[0006] In 2021, Wang Zimin et al. prepared a salt-resistant superabsorbent resin by aqueous solution polymerization. The main components included cassava starch (CST), acrylic acid (AA), and dimethylaminopropylacrylamide (DMAPAA). This superabsorbent resin exhibited good thermal stability below 200℃, and after soaking in salt water for a period of time, it showed an ideal swelling ratio. In ultra-high concentration salt water, the swelling ratio was considerable, and no aggregation occurred, demonstrating good salt resistance. (Wang Zimin, Shi Haixin, Wang Airong, et al. Preparation of CST-g-AA-DMAPAA superabsorbent resin and its swelling properties in salt water [J]. New Chemical Materials, 2021, 49(01):180-183+189.)
[0007] In 2022, Jia Hu et al. invented a novel high-temperature resistant, density-adjustable flexible colloidal completion fluid. The system is a viscoelastic body, primarily elastic, exhibiting minimal working fluid leakage during field construction and demonstrating excellent operational performance. This fluid provides technical support for safe and efficient well completion operations in multi-pressure oil and gas reservoirs, and offers new ideas and technologies for safe and efficient drilling and production in deep, low-permeability oil and gas reservoirs. (Jia Hu, Dai Changlou, Li Sanxi, et al. A novel high-temperature resistant, density-adjustable flexible colloidal completion fluid [J]. Natural Gas Industry, 2022, 42(12):106-116.)
[0008] Currently, particulate, solid-free cleaning plugging fluid systems, represented by sodium carboxymethyl cellulose (CMC), remain stable for 16 hours at 120°C. However, they are prone to thermal oxidation and degradation, limiting their use in temporary plugging operations in high-temperature oil and gas wells. Addressing the issues of insufficient stability at high temperatures and difficulty in weighting conventional plugging systems to meet the requirements of high-pressure, high-temperature well plugging, there is an urgent need to develop a high-temperature resistant and weight-bearing cleaning plugging fluid system. Summary of the Invention
[0009] To address at least one of the aforementioned problems, this invention provides a high-temperature resistant, clean, solid-free particulate temporary plugging fluid with an adjustable density (1.01–1.55 g / cm³). 3It has a wide operating temperature range (40~160℃) and is resistant to high temperature and high salt content, as well as good compatibility with high-mineralization formation water for conventional plugging fluids.
[0010] The technical solution of this invention is as follows: Take a certain amount of hydrophilic material, add weighting salt while stirring until it is completely dissolved, and then add solid-free particles. The particles are self-developed in the laboratory and are copolymer materials containing carboxyl groups (-COOH), zwitterions, sulfonic acid groups, hydroxyl groups (-OH), and amide groups (-CONH2). They have a three-dimensional network structure and can absorb a certain mass concentration of salt water and expand. At room temperature, the particle size is 0.1-1.5 mm, and after absorbing salt, the particle size is 0.5-2.5 mm. The crosslinking agent contains four carbon-carbon double bonds to enhance the crosslinking strength and temperature resistance. The particles contain nitrogen positive ion groups and chloride negative ions to enhance the salt absorption capacity. The absorption ratio of different types of salt water is 17.4-28.8 g / g. After standing for 24-72 hours, the particles are completely swollen to obtain a temporary plugging solution.
[0011] The aforementioned weighting salt is mainly used to increase the system density to facilitate compatibility with the working fluid and formation water. Its main mechanism is as follows: During on-site construction, after the temporary plugging system is pumped to the bottom of the well, kill fluid is pumped into the upper part. Therefore, the weighted granular temporary plugging fluid ensures that it will not float under the action of the kill fluid. Simultaneously, the absence of solid particles in the temporary plugging fluid allows it to enter the perforation during the plugging process, forming a granular temporary plugging layer, reducing or preventing leakage of the weighting fluid and minimizing reservoir damage.
[0012] In one embodiment of the present invention, the density of the high-temperature resistant, clean, solid-free particulate temporary plugging fluid is 1.01–1.55 g / cm³. 3 .
[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:
[0014] The high-temperature resistant, clean, solid-free particulate temporary plugging solution of this invention exhibits good high-temperature stability. After aging at 160°C for 10 days, the particles remain elastic without significant gel breakage. The density of the temporary plugging solution is 1.01–1.55 g / cm³. 3 It can adapt to most working environments. Before aging, at a measurement frequency of 10Hz, the particle elastic modulus ranges from 1020 to 1360 Pa, and the viscous modulus from 63.3 to 118 Pa. After aging, the particle elastic modulus ranges from 1019 to 1540 Pa, the viscous modulus from 62.4 to 117 Pa, and the viscosity ranges from 48 to 200 mPa·s. These data indicate that the temporary plugging fluid proposed in this invention has good mechanical properties during on-site construction, ensuring the smooth completion of the temporary plugging operation. Attached Figure Description
[0015] Figure 1 Example 1: Viscosity-temperature relationship of high-temperature resistant, clean, solid-free particulate temporary plugging fluid
[0016] Figure 2 Example 2: Schematic diagram of compatibility test between high-temperature resistant, clean, solid-free particulate temporary plugging fluid and formation water.
[0017] Figure 3 Example 2: Elastic modulus graphs of high-temperature resistant, clean, solid-free particulate temporary plugging fluid at different concentrations before aging.
[0018] Figure 4 Example 2: Viscosity modulus of high-temperature resistant, clean, solid-free particulate temporary plugging fluid before aging at different concentrations
[0019] Figure 5 Example 3: High-temperature resistant, clean, solid-free particulate temporary plugging solution (6% particle concentration, viscoelastic modulus diagram)
[0020] Figure 6 Example 4: High-Temperature Resistant Clean Solid-Free Particulate Temporary Plugging Liquid (5% Particle Concentration Viscoelastic Modulus)
[0021] Figure 7 Example 5: High-Temperature Resistant Clean Solid-Free Particulate Temporary Plugging Liquid (4% Particle Concentration Viscoelastic Modulus)
[0022] Figure 8 Example 6: High-Temperature Resistant Clean Solid-Free Particulate Temporary Plugging Liquid (3% Particle Concentration Viscoelastic Modulus) Detailed Implementation
[0023] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.
[0024] Unless otherwise specified, the raw materials used in the following embodiments are all conventional commercial products.
[0025] Unless otherwise specified, the methods used in the following embodiments are conventional methods in the art.
[0026] In the following embodiments, its high-temperature resistance was measured using the following methods:
[0027] The temporary plugging solution can be subjected to closed high-temperature aging in a roller furnace at 160℃. After removal, its viscosity at different temperatures is measured, and the strength of the aged product is observed to examine the temperature resistance of the temporary plugging solution.
[0028] Example 1
[0029] This embodiment provides a method for preparing a high-temperature resistant, clean, solid-free particulate temporary plugging fluid, including the following raw material ratio and preparation method: The high-temperature resistant, clean, solid-free particulate temporary plugging fluid comprises 93 wt% weighting liquid, wherein the weighting salt is potassium formate with a density of 1.55 g / cm³. 37wt% solid-free particles (laboratory-developed, particle size 0.1-1.5 mm at room temperature, particle size 0.5-2.5 mm after salt absorption), salt absorption 17.4 g / g.
[0030] This embodiment also provides a method for preparing solid-particle-free formulations:
[0031] Add distilled water to a three-necked flask, weigh an appropriate amount of CMC and add it to the flask, connect a condenser, and stir in an oil bath at 60°C until dissolved. After the CMC dissolves, add KPS solution to the flask and activate for 10 min. Prepare appropriate amounts of AA (neutralization degree 70-90%), AMPS, and DAC solutions, lower the oil bath temperature to 50°C, and add them to the flask. When the temperature rises to 60°C, add an appropriate amount of TAAC solution, raise the oil bath temperature to 70°C, and react for 3 h. After the reactants in the flask become a transparent colloid, transfer the product to a beaker, chop it, soak and wash it with ethanol, then transfer it to an 80°C oven to dry until the quality stabilizes, and grind it to obtain granular particles without solid phase.
[0032] In this embodiment, the viscosity-temperature relationship of the high-temperature resistant, clean, solid-free particulate temporary plugging fluid after aging at 160°C for 10 days is shown in Table 1.
[0033] Table 1 Relationship between temporary plugging fluid viscosity and temperature
[0034]
[0035] The results are as follows Figure 1 As shown, at the same temperature, the effective viscosity of the plugging fluid without solid particles increases with increasing shear rate, ranging from 48 to 200 mPa·s. At a constant shear rate, the effective viscosity of the plugging fluid gradually decreases with increasing temperature. At the same temperature (20-90℃), the effective viscosity of the plugging fluid changes with increasing shear rate. At low shear rates (approximately 0-500 s⁻¹), the effective viscosity decreases with increasing shear rate. -1 At high shear rates (>500 s⁻¹), the viscosity of the various temperature curves remains relatively stable; at high shear rates (>500 s⁻¹), the viscosity of the other temperature curves remains relatively stable. -1 After that, the viscosity increases significantly with the shear rate, and the lower the temperature, the greater the slope of viscosity increase. At the same shear rate, the lower the temperature, the higher the effective viscosity. For example, at a shear rate of 1000 s⁻¹... -1 At 20°C, the viscosity is much higher than that at 90°C, indicating that as the temperature increases, the viscosity of the temporary plugging fluid generally decreases, and the fluid flowability improves.
[0036] Example 2
[0037] This embodiment provides a method for preparing a high-temperature resistant, clean, solid-free particulate temporary plugging fluid, including the following raw material ratios and preparation method: The high-temperature resistant, clean, solid-free particulate temporary plugging fluid comprises, by mass percentage, weighting solutions of varying concentrations, including potassium formate with a density of 1.55 g / cm³. 3The sample contains a certain amount of clean water, as well as particles of different concentrations without solid phase (developed in the laboratory, with a particle size of 0.1–1.5 mm at room temperature and 0.5–2.5 mm after salt absorption), and absorbs 17.4 g / g of salt water.
[0038] The preparation method of the high-temperature resistant, clean, solid-free particulate temporary plugging fluid in this embodiment is the same as that in Example 1, and will not be described further.
[0039] In this embodiment, a high-temperature resistant, clean, solid-free particulate temporary plugging liquid is used, such as... Figure 2 As shown, the temporary plugging fluid mixed with simulated formation water at a salinity of 25,000 remained at the bottom without rising to the surface or producing flocculent material, indicating good compatibility between the surface plugging fluid and the formation water. Figure 3 , Figure 4 As shown, within the range of 0 to 40 Hz, at a measurement frequency of 10 Hz, the elastic modulus ranges from 1020 to 1360 Pa, and the viscous modulus ranges from 63.3 to 118 Pa. Before aging, the particle G' decreases slightly, while G" increases slightly, indicating that the system without solid phase particles temporarily blocking it is a viscoelastic (G'>G").
[0040] In summary, the high-temperature resistant, clean, solid-free particulate temporary plugging fluid of this invention exhibits advantages such as high-temperature resistance, high-salinity resistance, and good compatibility with high-mineralization formation water over a wide temperature range (40–160°C). It can meet the needs of practical temporary plugging operations. Furthermore, its cost is relatively low, making it suitable for large-scale promotion.
[0041] Example 3
[0042] This embodiment provides a method for preparing a high-temperature resistant, clean, solid-free particulate temporary plugging fluid, including the following raw material ratio and preparation method: The high-temperature resistant, clean, solid-free particulate temporary plugging fluid comprises 94 wt% weighting liquid, wherein the weighting salt is sodium chloride with a density of 1.10 g / cm³. 3 The water contains a certain amount of clean water, and also includes 6wt% solid-free particles (developed in the laboratory, with a particle size of 0.1-1.5 mm at room temperature and 0.5-2.5 mm after salt absorption) and 28.8 g / g of salt water.
[0043] The preparation method of the high-temperature resistant, clean, solid-free particulate temporary plugging fluid in this embodiment is the same as that in Example 1, and will not be described further.
[0044] In this embodiment, the high-temperature resistant, clean, solid-free particulate temporary plugging fluid, after being aged at 160°C for 10 days, exhibited an elastic modulus of 1070 Pa and a viscous modulus of 62.4 Pa at a measurement frequency of 10 Hz. Figure 5At 0–40 Hz, the salt-absorbing particle G' decreased slightly after aging, while G" increased slightly, indicating that the non-solid particle plugging system is a viscoelastic body (G'>G"). After aging, the plugging solution of this particle concentration was mixed with simulated formation water with a salinity of 25,000. Both solutions remained at the bottom and did not float, nor did they produce flocculent matter, indicating good compatibility between the surface plugging solution and the formation water.
[0045] Example 4
[0046] This embodiment provides a method for preparing a high-temperature resistant, clean, solid-free particulate temporary plugging fluid, including the following raw material ratios and preparation method: The high-temperature resistant, clean, solid-free particulate temporary plugging fluid comprises 95 wt% weighting liquid, with the weighting salt potassium chloride having a density of 1.20 g / cm³. 3， A certain quality of clean water also includes 5 wt% solid-free particles (laboratory-developed, particle size 0.1-1.5 mm at room temperature, particle size 0.5-2.5 mm after salt absorption), and 22.3 g / g of salt water absorbed.
[0047] The preparation method of the high-temperature resistant, clean, solid-free particulate temporary plugging fluid in this embodiment is the same as that in Example 1, and will not be described further.
[0048] In this embodiment, the high-temperature resistant, clean, solid-free particulate temporary plugging fluid, after being aged at 160°C for 10 days, exhibited an elastic modulus of 1540 Pa and a viscous modulus of 117 Pa at a measurement frequency of 10 Hz. Figure 6 At 0–40 Hz, the salt-absorbing particle G' decreased slightly after aging, while G" increased slightly, indicating that the non-solid particle plugging system is a viscoelastic body (G'>G"). After aging, the plugging solution of this particle concentration was mixed with simulated formation water with a salinity of 25,000. Both solutions remained at the bottom and did not float, nor did they produce flocculent matter, indicating good compatibility between the surface plugging solution and the formation water.
[0049] Example 5
[0050] This embodiment provides a method for preparing a high-temperature resistant, clean, solid-free particulate temporary plugging fluid, including the following raw material ratios and preparation method: The high-temperature resistant, clean, solid-free particulate temporary plugging fluid comprises 96 wt% weighting liquid, wherein the weighting salt sodium formate has a density of 1.40 g / cm³. 3 The water contains a certain amount of clean water, and also includes 4wt% solid-free particles (developed in the laboratory, with a particle size of 0.1-1.5 mm at room temperature and 0.5-2.5 mm after salt absorption) and 20.6 g / g of salt water.
[0051] The preparation method of the high-temperature resistant, clean, solid-free particulate temporary plugging fluid in this embodiment is the same as that in Example 1, and will not be described further.
[0052] In this embodiment, the high-temperature resistant, clean, solid-free particulate temporary plugging fluid, after being aged at 160°C for 10 days, exhibited an elastic modulus of 1019 Pa and a viscous modulus of 63.3 Pa at a measurement frequency of 10 Hz. Figure 7 At 0–40 Hz, the salt-absorbing particle G' decreased slightly after aging, while G" increased slightly, indicating that the non-solid particle plugging system is a viscoelastic body (G'>G"). After aging, the plugging solution of this particle concentration was mixed with simulated formation water with a salinity of 25,000. Both solutions remained at the bottom and did not float, nor did they produce flocculent matter, indicating good compatibility between the surface plugging solution and the formation water.
[0053] Example 6
[0054] This embodiment provides a method for preparing a high-temperature resistant, clean, solid-free particulate temporary plugging fluid, including the following raw material ratio and preparation method: The high-temperature resistant, clean, solid-free particulate temporary plugging fluid comprises 97 wt% weighting liquid, wherein the weighting salts potassium formate and sodium formate are compounded, with a density of 1.50 g / cm³. 3 The water contains a certain amount of clean water, and also includes 3wt% solid-free particles (developed in the laboratory, with a particle size of 0.1-1.5 mm at room temperature and 0.5-2.5 mm after salt absorption) and 18.1 g / g of salt water.
[0055] The preparation method of the high-temperature resistant, clean, solid-free particulate temporary plugging fluid in this embodiment is the same as that in Example 1, and will not be described further.
[0056] In this embodiment, the high-temperature resistant, clean, solid-free particulate temporary plugging fluid, after being aged at 160°C for 10 days, exhibited an elastic modulus of 1460 Pa and a viscous modulus of 87.1 Pa at a measurement frequency of 10 Hz. Figure 8 At 0–40 Hz, the salt-absorbing particles G' decreased slightly after aging, while G" increased slightly, indicating that the temporary plugging system without solid particles is a viscoelastic body (G'>G"). After aging, the plugging fluid was mixed with simulated formation water with a salinity of 25,000, and both remained at the bottom without floating or producing flocculent matter, indicating good compatibility between the surface plugging fluid and formation water.
[0057] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the embodiments of the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.
Claims
1. A high-temperature resistant, clean, solid-particle-free temporary plugging fluid, characterized in that, By mass percentage, it includes 93wt% to 99.5wt% of a weighting liquid, which is a weighting salt solution, specifically a mixture of one or more of potassium formate, sodium chloride, potassium chloride, and sodium formate; and by mass percentage, it includes 0.5wt% to 7wt% of solid-free particles.
2. The high-temperature resistant, clean, solid-free particulate temporary plugging fluid according to claim 1, characterized in that, The concentration of the weighting salt is 0.5 wt% to 61 wt% by mass percentage.
3. The high-temperature resistant, clean, solid-free particulate temporary plugging fluid according to claim 1, characterized in that, The weighting salt is specifically one or more of potassium formate, sodium chloride, potassium chloride, and sodium formate, and the particles are placed in the weighting solution at room temperature for 24-72 hours to allow them to fully swell.
4. The high-temperature resistant, clean, solid-free particulate temporary plugging fluid according to claim 1, characterized in that, The solid-free particles, with a concentration of 0.5-7%, are mainly prepared by polymerization of sodium carboxymethyl cellulose (CMC), acrylic acid (AA), and 2-acrylamido-2-methylpropanesulfonic acid (AMPS).
5. The high-temperature resistant, clean, solid-free particulate temporary plugging fluid according to claim 1, characterized in that, The particles are copolymer materials containing carboxyl groups (-COOH), sulfonic acid groups, hydroxyl groups (-OH), amide groups (-CONH2), and zwitterions.
6. The high-temperature resistant, clean, solid-free particulate temporary plugging fluid according to claim 1, characterized in that... The granular structure consists of monomers grafted onto the CMC framework, forming a three-dimensional network structure.
7. The high-temperature resistant, clean, solid-free particulate temporary plugging fluid according to claim 1, characterized in that, The particulate crosslinking agent contains four carbon-carbon double bonds to enhance crosslinking strength and temperature resistance, and contains nitrogen positive ion groups and chloride negative ions to enhance salt absorption capacity. At room temperature, the particle size is 0.1-1.5 mm, and after salt absorption, the particle size is 0.5-2.5 mm.
8. The high-temperature resistant, clean, solid-free particulate temporary plugging fluid according to claim 1, characterized in that, The density of the temporary plugging fluid varies from 1.01 to 1.55 g / cm³. 3 The corresponding apparent viscosity is in the range of 48–200 mPa·s.
9. The high-temperature resistant, clean, solid-free particulate temporary plugging fluid according to claim 1, characterized in that, The temporary plugging fluid has a good viscoelastic modulus. Before aging, the particle elastic modulus ranges from 1020 to 1360 Pa and the viscous modulus ranges from 63.3 to 118 Pa at a measurement frequency of 10 Hz. After aging, the particle elastic modulus ranges from 1019 to 1540 Pa.
10. The high-temperature resistant, clean, solid-free particulate temporary plugging fluid according to claim 1, characterized in that, The temporary plugging fluid has good compatibility with formation water. After aging, when the temporary plugging fluid is mixed with simulated formation water with a mineralization of 25,000 mg / L, it remains at the bottom and does not float to the surface, and no flocculent matter is produced.