Ultrahigh-temperature-resistant efficient rock-carrying water-based drilling fluid

Abstract

The invention provides an ultrahigh-temperature-resistant efficient rock-carrying water-based drilling fluid, the water-based drilling fluid comprises a shear strength improving agent and a filtrate reducer, and the shear strength improving agent is prepared from sepiolite and silicon dioxide. The water-based drilling fluid has good rheological property and excellent filtrate loss reduction capacity, can meet the requirement for reducing the filtrate loss under the ultrahigh-temperature condition, meets the requirement for ultrahigh-temperature formation drilling, and has important significance on development of hot dry rocks.

Description

Technical Field

[0001] The invention belongs to the technical field of drilling, relates to a water-based drilling fluid, and further relates to an ultra-high temperature resistant and highly efficient rock-carrying water-based drilling fluid. Background Art

[0002] Geothermal energy is huge and renewable. As long as it is comprehensively utilized, reasonably developed and well planned, geothermal energy can be used forever by humans. Together with wind energy, solar energy and hydropower, it is called the "four major green renewable clean energy resources". The rational and multi-level cascade utilization of geothermal resources plays an important role in adjusting my country's energy supply structure, ensuring the security of energy resource supply, alleviating energy supply pressure and promoting regional economic development.

[0003] Compared with traditional hydrothermal geothermal resources, hot dry rock geothermal resources have the advantages of large energy, wide distribution, renewable, safe, clean and pollution-free, and not restricted by seasons and day and night. They are important targets for geothermal energy development. However, hot dry rock drilling has the following three main characteristics: First, hot dry rock has high hardness, strong abrasiveness, poor drillability, low drilling efficiency, especially low drilling efficiency when drilling large diameter wells; second, the temperature of hot dry rock formation is high, generally 180-650℃. After entering the high-temperature rock mass, the temperature in the well rises sharply. Long-term high temperature will cause the performance of drilling fluid to change sharply, affecting the carrying of cuttings and the cooling of drill tools, and easily causing the instability of the well wall and the acceleration of high-temperature corrosion of drill tools; third, the ground stress of hot dry rock formation is high. Under the influence of the alternating cold and hot cycles of drilling fluid, the hole wall is prone to creep and ground stress release, causing the well wall to fall off, thereby inducing well accidents such as falling off and stuck drill. Ultra-high temperature resistant and efficient rock-carrying water-based drilling fluid is the key to the safe and efficient development of hot dry rock, but the existing drilling fluids are difficult to meet the needs of hot dry rock drilling.

[0004] CN 107629768 A discloses a water-based drilling fluid resistant to ultra-high temperature. By adopting a rheological stabilizer, the drilling fluid can be resistant to a temperature of up to 260°C. This technology can well inhibit the decomposition of the drilling fluid treatment agent under ultra-high temperature conditions, but does not consider the problem of thickening of the drilling fluid under ultra-high temperature conditions; CN 103160259 A discloses a water-based drilling fluid resistant to ultra-high temperature of 255°C and its construction process. This technology can well solve the problem of regulating the performance of the drilling fluid under ultra-high temperature conditions, but the temperature resistance is less than 260°C, and the performance of the water-based drilling fluid under ultra-high temperature conditions is not considered. Therefore, the research on a water-based drilling fluid resistant to ultra-high temperature and efficient rock-carrying and its preparation method has important practical significance. Summary of the invention

[0005] In order to solve the above technical problems, the present application provides a water-based drilling fluid that is resistant to ultra-high temperatures and highly efficient in carrying rocks. The water-based drilling fluid has good rheological properties and excellent filtration loss reduction capabilities, can meet the requirements for reducing filtration loss under ultra-high temperature conditions, meet the needs of ultra-high temperature formation drilling, and is of great significance to the development of hot dry rocks.

[0006] In order to achieve the above technical effects, the present invention adopts the following technical solutions:

[0007] The invention provides an ultra-high temperature resistant and highly efficient rock-carrying water-based drilling fluid. The water-based drilling fluid comprises a shearing agent and a fluid loss reducer. The raw materials of the shearing agent comprise sepiolite and silicon dioxide.

[0008] As a preferred technical solution of the present invention, the raw material of the cutting agent also includes montmorillonite.

[0009] As a preferred technical solution of the present invention, the cutting agent includes 1 to 10 parts of sepiolite, 2 to 20 parts of montmorillonite and 1 to 10 parts of silicon dioxide in parts by mass. Among them, the mass part of sepiolite can be 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts, etc., the mass part of montmorillonite can be 2 parts, 3 parts, 5 parts, 8 parts, 10 parts, 12 parts, 15 parts, 18 parts or 20 parts, etc., and the mass part of silicon dioxide can be 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts, etc., but it is not limited to the listed values, and other values ​​not listed within the above numerical ranges are also applicable.

[0010] As a preferred technical solution of the present invention, the preparation method of the cutting agent comprises:

[0011] The sepiolite and montmorillonite are first screened and then mixed with silicon dioxide for ball milling. After washing and drying, they are second screened to obtain the shearing agent.

[0012] As a preferred technical solution of the present invention, the first screening is to pass the sepiolite and montmorillonite through a 100-200 mesh sieve, such as 100 mesh, 115 mesh, 120 mesh, 125 mesh, 130 mesh, 140 mesh, 150 mesh, 160 mesh, 170 mesh, 175 mesh, 180 mesh or 200 mesh, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0013] As a preferred technical solution of the present invention, the speed of the ball mill is 200-300 rpm, and the time is 3-6 hours. The speed can be 200 rpm, 210 rpm, 220 rpm, 230 rpm, 240 rpm, 250 rpm, 260 rpm, 270 rpm, 280 rpm, 290 rpm or 300 rpm, and the time can be 3 hours, 3.5 hours, 4 hours, 4.5 hours, 5 hours, 5.5 hours or 6 hours, but it is not limited to the listed values, and other values ​​not listed in the above numerical ranges are also applicable.

[0014] As a preferred technical solution of the present invention, the second screening is through a 150-200 mesh sieve, such as 150 mesh, 160 mesh, 170 mesh, 175 mesh, 180 mesh or 200 mesh, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0015] As a preferred technical solution of the present invention, the fluid loss reducer includes sulfonated phenolic resin, sulfonated lignite resin, sulfonated asphalt and polymerized alcohol.

[0016] As a preferred technical solution of the present invention, the water-based drilling fluid also includes a pH regulator, a reservoir protective agent, an inhibitor, a lubricant, a weighting agent and water.

[0017] As a preferred technical solution of the present invention, the water-based drilling fluid includes, by weight, 100 parts of water, 0.1-1 parts of pH adjuster, 1-4 parts of shearing agent, 2-6 parts of sulfonated phenolic resin, 2-6 parts of sulfonated lignite resin, 1-4 parts of sulfonated asphalt, 1-4 parts of polymeric alcohol, 2-8 parts of reservoir protective agent, 5-10 parts of inhibitor, 0.5-3 parts of lubricant and 0-100 parts of weighting agent.

[0018] Among them, the mass part of pH adjusting agent can be 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part or 1 part, etc., the mass part of cutting agent can be 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts or 4 parts, etc., the mass part of sulfonated phenolic resin can be 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5.5 parts or 6 parts, etc., the mass part of sulfonated lignite resin can be 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5.5 parts or 6 parts, etc., the mass part of sulfonated asphalt can be 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts or 4 parts, etc., the mass part of polyol can be The mass parts of the lubricant can be 0.5 parts, 1 parts, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts or 4 parts, the mass parts of the reservoir protection agent can be 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts or 8 parts, the mass parts of the inhibitor can be 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, 8.5 parts, 9 parts, 9.5 parts or 10 parts, the mass parts of the lubricant can be 0.5 parts, 1 parts, 1.5 parts, 2 parts, 2.5 parts or 3 parts, the mass parts of the weighting agent can be 1 part, 2 parts, 5 parts, 10 parts, 15 parts, 20 parts, 30 parts, 50 parts, 80 parts or 100 parts, but are not limited to the listed values, and other values ​​not listed within the above numerical ranges are equally applicable.

[0019] Compared with the prior art, the present invention has at least the following beneficial effects:

[0020] The present application provides an ultra-high temperature resistant and efficient rock-carrying water-based drilling fluid, which has good rheological properties and excellent filtration loss reduction capability, can meet the requirement of reducing filtration loss under ultra-high temperature conditions, meet the needs of ultra-high temperature formation drilling, and is of great significance to the development of hot dry rocks. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further illustrated below through specific implementation methods.

[0022] A specific embodiment of the present invention provides an ultra-high temperature resistant and efficient rock-carrying water-based drilling fluid, wherein the water-based drilling fluid comprises a shear enhancer and a fluid loss reducer, and the raw materials of the shear enhancer comprise sepiolite and silicon dioxide.

[0023] In the present invention, the shear enhancer component in the water-based drilling fluid improves the hydration stability of clay at ultra-high temperature by introducing sepiolite, and simultaneously the introduction of silicon dioxide improves the quality of the mud cake and the plugging performance of the drilling fluid.

[0024] In one specific embodiment of the present invention, the particle size of silicon dioxide in the shearing agent is 50 to 200 nm.

[0025] In a specific embodiment of the present invention, in the method for preparing the shearing agent, 50 to 100 parts of ethanol are added to the ball milling device before ball milling.

[0026] In one embodiment of the present invention, in the preparation method of the shearing agent, ethanol is used to wash the ball-milled material. The drying temperature can be 50-60°C.

[0027] In a specific embodiment of the present invention, the molecular weight of the sulfonated phenolic resin may be 10,000-50,000, the molecular weight of the sulfonated lignite resin may be 10,000-50,000, the weight average molecular weight of the sulfonated asphalt may be 1,000-10,000, and the molecular weight of the polyol may be 200-400.

[0028] In one embodiment of the present invention, the pH adjuster includes sodium hydroxide and / or sodium carbonate.

[0029] In a specific embodiment of the present invention, the reservoir protection agent includes any one of ultrafine calcium carbonate, a one-way pressure shielding temporary plugging agent or an oil film temporary plugging agent, or a combination of at least two thereof, preferably ultrafine calcium carbonate.

[0030] In one embodiment of the present invention, the inhibitor comprises potassium chloride and / or potassium formate.

[0031] In the present invention, the introduction of the inhibitor can effectively prevent the hydration and expansion of the formation and improve the stability of the well wall.

[0032] In one embodiment of the present invention, the lubricant comprises graphite and / or white mineral oil.

[0033] In the present invention, the lubricant can reduce the flow loss of the drilling fluid and the friction loss between the pipe string and the formation.

[0034] In a specific embodiment of the present invention, the weighting agent includes any one of iron ore powder, calcium carbonate powder, barite, hematite or galena powder, or a combination of at least two thereof, preferably barite.

[0035] In a specific embodiment of the present invention, the preparation method of water-based drilling fluid includes: adding a shearing agent to water, stirring at a low speed for 20 to 30 minutes, and then adding a pH regulator, a sulfonated phenolic resin, a sulfonated lignite resin, a sulfonated asphalt, a polymer alcohol, a reservoir protective agent, an inhibitor, a lubricant and a weighting agent in sequence, and stirring at a high speed for 20 minutes after each treatment agent is added; the low-speed stirring is 3000 to 4000 r / min, and the high-speed stirring is 6000-8000 r / s.

[0036] For the convenience of understanding the present invention, the present invention lists the following embodiments. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0037] Example 1

[0038] This embodiment provides an ultra-high temperature resistant and efficient rock-carrying water-based drilling fluid, and a preparation method thereof comprises the following steps:

[0039] 2 parts by weight of a shearing agent and 0.5 parts by weight of sodium hydroxide are added to 100 parts of water, stirred at high speed for 20 minutes, and then allowed to stand at room temperature for curing for 24 hours. The slurry is stirred at high speed for another 20 minutes, and 2 parts of sulfonated phenolic resin, 2 parts of sulfonated lignite resin and 1 part of sulfonated asphalt are added, and stirred at high speed for 20 minutes; 2 parts of polyol, 2 parts of ultrafine calcium carbonate, 1 part of white mineral oil and 5 parts of potassium chloride are added, and stirred at high speed for 20 minutes; 50 parts of a weighting agent are added, and stirred at high speed for 20 minutes. The drilling fluid is then put into an aging tank and hot-rolled at 260° C. for 16 hours to obtain the water-based drilling fluid F1.

[0040] The preparation method of the cutting agent comprises the following steps:

[0041] Weigh 1 part of sepiolite, 2 parts of montmorillonite, and 1 part of silicon dioxide with a particle size of 50 nm and add them into a ball mill filled with 50 parts of ethanol respectively. After ball milling at 200 rpm for 3 hours, the obtained composite material is washed with anhydrous ethanol, dried at 60°C for 2 hours, and finally sieved with 150 mesh to obtain the shearing agent.

[0042] Example 2

[0043] This embodiment provides an ultra-high temperature resistant and efficient rock-carrying water-based drilling fluid, and a preparation method thereof comprises the following steps:

[0044] 2 parts by weight of a shearing agent and 0.5 parts by weight of sodium hydroxide are added to 100 parts of water, stirred at high speed for 20 minutes, and then allowed to stand at room temperature for curing for 24 hours. The slurry is stirred at high speed for another 20 minutes, and 2 parts of sulfonated phenolic resin, 2 parts of sulfonated lignite resin and 1 part of sulfonated asphalt are added, and stirred at high speed for 20 minutes; 2 parts of polyol, 2 parts of ultrafine calcium carbonate, 1 part of white mineral oil and 5 parts of potassium chloride are added, and stirred at high speed for 20 minutes; 50 parts of a weighting agent are added, and stirred at high speed for 20 minutes. The drilling fluid is then put into an aging tank and hot-rolled at 260° C. for 16 hours to obtain the water-based drilling fluid F2.

[0045] The preparation method of the cutting agent comprises the following steps:

[0046] Weigh 5 parts of sepiolite, 10 parts of montmorillonite, and 5 parts of silicon dioxide with a particle size of 100 nm, respectively, and add them into a ball mill filled with 100 parts of ethanol. After ball milling at 300 rpm for 3 hours, the obtained composite material is washed with anhydrous ethanol, dried at 60°C for 2 hours, and finally sieved with 200 mesh to obtain the shearing agent.

[0047] Example 3

[0048] This embodiment provides an ultra-high temperature resistant and efficient rock-carrying water-based drilling fluid, and a preparation method thereof comprises the following steps:

[0049] 2 parts by weight of a shearing agent and 0.5 parts by weight of sodium carbonate are added to 100 parts of water, stirred at high speed for 20 minutes, and then allowed to stand and cure at room temperature for 24 hours. The slurry is stirred at high speed for another 20 minutes, and 2 parts of sulfonated phenolic resin, 5 parts of sulfonated lignite resin and 4 parts of sulfonated asphalt are added, and stirred at high speed for 20 minutes; 4 parts of polyol, 5 parts of ultrafine calcium carbonate, 1 part of modified graphite and 10 parts of potassium formate are added, and stirred at high speed for 20 minutes; 80 parts of a weighting agent are added, and stirred at high speed for 20 minutes. The drilling fluid is then put into an aging tank and hot-rolled at 260° C. for 16 hours to obtain the water-based drilling fluid F3.

[0050] The preparation method of the cutting agent comprises the following steps:

[0051] Weigh 2 parts of sepiolite, 5 parts of montmorillonite, and 2 parts of silicon dioxide with a particle size of 70 nm and add them into a ball mill filled with 50 parts of ethanol respectively. After ball milling at 200 rpm for 3 hours, the obtained composite material is washed with anhydrous ethanol, dried at 60°C for 2 hours, and finally sieved with 200 mesh to obtain the shearing agent.

[0052] Comparative Example 1

[0053] This comparative example provides a water-based drilling fluid that is resistant to ultra-high temperatures and has high efficiency and rock-carrying properties, and a preparation method thereof comprises the following steps:

[0054] 2 parts by mass of sodium bentonite are added to 100 parts of water, stirred at high speed for 20 minutes, and then allowed to stand and cure at room temperature for 24 hours. The bentonite slurry is stirred at high speed for another 20 minutes. 2 parts of sulfonated phenolic resin, 5 parts of sulfonated lignite resin and 4 parts of sulfonated asphalt are added and stirred at high speed for 20 minutes. 4 parts of polymer alcohol, 5 parts of ultrafine calcium carbonate, 1 part of modified graphite and 10 parts of potassium formate are added and stirred at high speed for 20 minutes. 80 parts of weighting agent are added and stirred at high speed for 20 minutes. The drilling fluid is loaded into an aging tank and hot-rolled at 260°C for 16 hours to obtain the water-based drilling fluid DF1.

[0055] Comparative Example 2

[0056] In this comparative example, except that sepiolite is not added to the shear enhancing agent, the other conditions are the same as those of Example 3 to obtain the water-based drilling fluid DF2.

[0057] Comparative Example 3

[0058] In this comparative example, except that silicon dioxide is not added to the shear enhancing agent, other conditions are the same as those in Example 3 to obtain the water-based drilling fluid DF3.

[0059] The sulfonated phenolic resin used in Examples 1-3 and Comparative Examples 1-3 has a molecular weight of about 20,000, the sulfonated lignite resin has a molecular weight of about 20,000, the sulfonated asphalt has a molecular weight of about 8,000, and the polyol has a molecular weight of about 300.

[0060] The rheological and filtration properties of the water-based drilling fluids provided in Examples 1-3 and Comparative Examples 1-3 were tested, and the results are shown in Table 1.

[0061] Rheological property test method: Pour the drilling fluid to be tested into the sample cup, place it on the sample cup holder of the instrument, adjust the height so that the liquid surface of the drilling fluid is just at the measuring line of the rotating drum, adjust the speed of the six-speed selective viscometer to 600r / min, read and record the value after the reading stabilizes, read and record the readings of 300, 200, 100, 6, and 3r / min in the same way, stir at 600r / min for 10s, let it stand for 10s, then read and record the maximum reading at 3r / min, stir at 600r / min for 10s, let it stand for 10min, then read and record the maximum reading at 3r / min.

[0062]

[0063] PV=Φ 600 -Φ 300

[0064] YP=0.511(Φ 300 -PV)

[0065] in:

[0066] Φ 600 —The reading on the viscometer at 600 r / min;

[0067] Φ 300 —The reading on the viscometer at 300 r / min;

[0068] AV—apparent viscosity, mPa·s;

[0069] PV—plastic viscosity, mPa·s;

[0070] YP—dynamic shear force, Pa.

[0071] Test method for filtration loss performance:

[0072] ①API medium pressure filtration loss (FL API )

[0073] The medium-pressure filter loss meter produced by Qingdao Tongchun Instrument Co., Ltd. was used for the filtration loss measurement. The filter cover, filter paper and rubber ring were installed on the base in sequence according to the operating procedures, the drilling fluid was poured into the tank to the scale line, the fixing nut was tightened, the ventilation device was connected, and the measuring cylinder was placed at the outlet of the liquid at the lower end of the container. The pressure was adjusted to 0.69MPa, and the vent valve was opened and the timing was started at the same time. The filtration loss of drilling fluid in 30 minutes was taken as the measurement result.

[0074] ②High temperature and high pressure filtration (FL HTHP )

[0075] The filtration loss was measured using a high-temperature and high-pressure filtration meter produced by Qingdao Tongchun Instrument Co., Ltd. Install the vent valve stem on the top of the pressure tank and rotate to close the vent valve. Pour the drilling fluid to be tested from the bottom of the tank to the scale, install the sealing ring, filter paper and filter screen in turn, cover the lid, tighten the fixed hexagonal screws and rotate to close the vent valve. Put the tank body face up into the heating device, adjust the preset temperature, put the metal thermometer instrument into the reserved measurement hole, check the sealing of all valve stems, and connect the upper and lower pressurized vent hose devices. According to the standard, adjust the upper pressure to the specified value of the corresponding temperature, open the upper vent valve of the sealed tank, ventilate and pressurize for 10s, and then close the upper vent valve; after the temperature rises to the set temperature, adjust the upper and lower pressures to the specified values ​​under the set test temperature conditions. Open the upper and lower vent valves (note that the upper and lower pressures should be adjusted first and then the lower pressures), and start timing. Intermittently and slowly open the filtrate outlet valve at the bottom of the tank, collect it with a measuring cylinder, record the total filtration loss within 30 minutes, and multiply the obtained filtration loss by 2 as the final filtration loss.

[0076] Table 1

[0077] Drilling Fluid AV,mPa.s PV,mPa.s YP,Pa 10s / 10min <![CDATA[FL API ,mL]]> <![CDATA[FL HTHP ,mL]]> F1 62 45 17 5 / 9 3.4 19.6 F2 68 49 19 6 / 9.5 2.8 16.8 F3 77 57 20 8 / 11 2.4 13.2 DF1 40 32 8 2 / 5 5.6 36.0 DF2 32 26 6 2 / 4 6.2 39.8 DF3 52 39 13 4 / 8 8.3 50.2

[0078] It can be seen from the rheological and filtration performance test results in Table 1 that the drilling fluid of the present invention has good rheological properties and excellent filtration loss reduction ability, can meet the requirements of reducing filtration loss under ultra-high temperature conditions, can meet the needs of ultra-high temperature formation drilling, and is of great significance to the development of hot dry rocks.

[0079] The applicant declares that the present invention illustrates the detailed process equipment and process flow of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned detailed process equipment and process flow, that is, it does not mean that the present invention must rely on the above-mentioned detailed process equipment and process flow to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A water-based drilling fluid that is resistant to ultra-high temperatures and highly efficient in carrying rocks, characterized in that: The water-based drilling fluid comprises a shear enhancer and a fluid loss reducer, and the raw materials of the shear enhancer comprise sepiolite and silicon dioxide.

2. The water-based drilling fluid according to claim 1, characterized in that: The raw material of the cutting agent also includes montmorillonite.

3. The water-based drilling fluid according to claim 1 or 2, characterized in that: The shearing agent comprises 1 to 10 parts of sepiolite, 2 to 20 parts of montmorillonite and 1 to 10 parts of silicon dioxide in parts by weight.

4. The water-based drilling fluid according to claim 3, characterized in that: The preparation method of the cutting agent comprises: The sepiolite and montmorillonite are first screened and then mixed with silicon dioxide for ball milling. After washing and drying, they are second screened to obtain the shearing agent.

5. The preparation method according to claim 4, characterized in that: The first screening is to pass the sepiolite and montmorillonite through a 100-200 mesh sieve.

6. The preparation method according to claim 4, characterized in that: The ball mill has a rotation speed of 200 to 300 rpm and a time of 3 to 6 hours.

7. The preparation method according to claim 4, characterized in that: The second screening is through a 150-200 mesh sieve.

8. The water-based drilling fluid according to claim 1, characterized in that: The fluid loss reducer comprises sulfonated phenolic resin, sulfonated lignite resin, sulfonated asphalt and polymeric alcohol.

9. The water-based drilling fluid according to claim 1, characterized in that: The water-based drilling fluid further comprises a pH regulator, a reservoir protectant, an inhibitor, a lubricant, a weighting agent and water.

10. The water-based drilling fluid according to claim 9, characterized in that: The water-based drilling fluid comprises, by weight, 100 parts of water, 0.1 to 1 parts of a pH adjuster, 1 to 4 parts of a shearing agent, 2 to 6 parts of a sulfonated phenolic resin, 2 to 6 parts of a sulfonated lignite resin, 1 to 4 parts of a sulfonated asphalt, 1 to 4 parts of a polymeric alcohol, 2 to 8 parts of a reservoir protective agent, 5 to 10 parts of an inhibitor, 0.5 to 3 parts of a lubricant and 0 to 100 parts of a weighting agent.

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