Method for producing filter-press improved water by using drilling filter-press water and application of filter-press improved water

Abstract

The invention discloses a method for producing filter-press improved water by using drilling filter-press water and application thereof, and belongs to the technical field of petroleum and natural gas drilling engineering.The method comprises the steps that pretreatment of the drilling filter-press water is conducted, specifically, the drilling filter-press water is introduced into an efficient sedimentation tank, a flocculating agent is added for natural sedimentation, and sand filtration and activated carbon filtration are conducted in sequence; water quality purification and adjustment: adding a high-efficiency ion exchanger, mixing to obtain a precipitate, filtering to obtain a filtrate, passing the filtrate through a strong-acid cation exchange resin column, carrying out adsorption filtration through zeolite, adding an acid-base regulator into the purified water to adjust the pH value of the purified water to 7-10, and finally adding a high-efficiency drilling fluid compatible stabilizer, uniformly stirring and mixing in a stirring tank to obtain filter pressing improved water; and preparing the drilling fluid by using the filter-press improved water. According to the invention, resource utilization of the drilling filter-pressing water is realized, water resource consumption and environmental pollution of drilling operation are reduced, and the drilling fluid which is stable in performance and meets various requirements of drilling engineering is prepared at the same time.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas drilling engineering technology, and relates to a method for producing improved filter water using drilling filter water, and more specifically to a method for producing improved filter water using drilling filter water and the application of improved filter water in the preparation of drilling fluid. Background Technology

[0002] In oil and gas drilling operations, drilling fluids play a crucial role, such as carrying cuttings, stabilizing the wellbore, and cooling and lubricating the drill bit. Traditional drilling fluid formulations typically rely on large quantities of high-quality water, which is not only costly but also faces limitations due to water scarcity in the context of increasingly scarce water resources.

[0003] Meanwhile, drilling processes generate large amounts of filter water. This filter water contains various solid particles, chemical additives, and heavy metal ions, among other pollutants. Direct discharge without treatment would cause serious environmental pollution. However, existing treatment methods mostly focus on achieving discharge standards, failing to adequately consider its resource utilization. Some attempts to use drilling filter water to prepare drilling fluids have resulted in unstable performance of the prepared fluids due to imperfect treatment processes, failing to meet the requirements of drilling operations.

[0004] Therefore, how to develop a method that can effectively treat drilling filter water and use the treated filter water to formulate drilling fluid with excellent performance that meets the needs of drilling engineering is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a method for producing modified filter water using drilling filter water and the application of modified filter water in the preparation of drilling fluid.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A method for producing modified filter water from well water includes the following steps:

[0008] (1) Pretreatment of drilling filter water: The drilling filter water is introduced into a high-efficiency sedimentation tank, flocculant is added for natural sedimentation, and then the supernatant after sedimentation is subjected to sand filtration and activated carbon filtration in sequence.

[0009] (2) Water purification and adjustment: The pretreated drilling filter water from step (1) is mixed with a high-efficiency ion exchanger to obtain a precipitate. The filtrate is filtered and passed through a strong acid cation exchange resin column, and then through zeolite for adsorption filtration to obtain purified water. Then, an acid-base regulator is added to the purified water to adjust the pH value to 7-10. Finally, a high-efficiency drilling fluid compatible stabilizer is added and the mixture is stirred evenly in a mixing tank to obtain the improved filter water.

[0010] The beneficial effects of this invention are: This invention utilizes the technology of preparing drilling fluid after treating drilling filter water to realize the resource utilization of drilling filter water, reduce water consumption and environmental pollution in drilling operations, and at the same time prepare drilling fluid with stable performance that meets various requirements of drilling engineering.

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] 1. Environmental benefits: It realizes the resource utilization of drilling filter water, reduces the discharge of drilling wastewater, and reduces environmental pollution.

[0013] 2. Economic Benefits: Using treated drilling filtration water to prepare drilling fluid replaces some high-quality water sources, reducing water resource procurement costs. Simultaneously, it reduces wastewater treatment costs, improves resource utilization efficiency, and lowers the overall cost of drilling operations.

[0014] 3. Technical performance advantages: The drilling fluid formulated by this invention has good rheological properties, filtration properties and stability, which can meet the drilling operation requirements under different geological conditions and improve drilling efficiency and quality.

[0015] Furthermore, in step (1), the flocculant is polyacrylamide, and the addition amount is 5-10 mg of polyacrylamide per 1 L of drilling filter water.

[0016] The beneficial effects of adopting the above-mentioned further technical solutions are that most of the solid particles in the water can be precipitated through natural sedimentation and the addition of flocculant polyacrylamide.

[0017] Furthermore, in step (1), the precipitation time is 2-4 hours.

[0018] Furthermore, in step (1), the above sand filter uses quartz sand with a particle size of 0.5-2mm and a filtration speed of 5-10m / h; the above activated carbon filter uses granular activated carbon and the contact time is 15-30 minutes.

[0019] The beneficial effects of adopting the above-mentioned further technical solutions are: quartz sand filtration removes residual fine particles in the water, and activated carbon filtration adsorbs organic matter and some heavy metal ions in the water.

[0020] Furthermore, in step (2), every 1m 3 Step (1) Add 10-15 kg of high-efficiency ion exchanger and 1-5 kg ​​of high-efficiency drilling fluid compatible stabilizer to the pretreated drilling filter water;

[0021] The aforementioned high-efficiency ion exchanger comprises sodium carbonate, sodium bicarbonate, sodium oxalate tetraacetate, and potassium carbonate, wherein the mass ratio of sodium carbonate, sodium bicarbonate, sodium oxalate tetraacetate, and potassium carbonate is 1:0.5:0.5:1.

[0022] The preparation method of the above-mentioned high-efficiency drilling fluid compatible stabilizer includes the following steps:

[0023] A high-efficiency drilling fluid compatible stabilizer is obtained by mixing a multi-component copolymer dry powder, sodium carboxymethyl cellulose and polysulfonyl phenolic resin, or by mixing a multi-component copolymer dry powder, sodium carboxymethyl cellulose and sulfonated asphalt.

[0024] The preparation method of the above-mentioned multi-component copolymer dry powder includes the following steps:

[0025] 1) Weigh the following raw materials according to the following mass parts: water 200-300 parts, methacrylamide 12.5-20.8 parts, 3-cyclohexylpropionic acid 8.2-10.7 parts, hydroxymethyl cellulose 3.5-6.5 parts, EDTA 0.2-6.5 parts, potassium persulfate 0.1-0.15 parts, sodium bisulfite 0.15-0.2 parts;

[0026] 2) Add methacrylamide to the water while stirring, and stir until the methacrylamide is completely dissolved;

[0027] 3) Continue stirring while adding 3-cyclohexylpropionic acid, stirring until the 3-cyclohexylpropionic acid is completely dissolved;

[0028] 4) Continue stirring while adding hydroxymethyl cellulose, stirring until the hydroxymethyl cellulose is completely dissolved;

[0029] 5) Continue stirring while adding EDTA. After the EDTA is added, add potassium persulfate and sodium bisulfite after a 1-minute interval to obtain a mixture;

[0030] 6) The mixture is heated to react, yielding a multi-component copolymer;

[0031] 7) The multi-component copolymer is spray-dried to produce multi-component copolymer dry powder.

[0032] The beneficial effects of adopting the above-mentioned further technical solutions are as follows: Highly efficient ion exchangers, followed by ion exchange resins and zeolite filtration and adsorption, can effectively remove metallic carbon cations (calcium, magnesium, aluminum, and iron) from drilling fluid. This causes the broken ions in the drilling fluid to form stable precipitates through filtration, resulting in only sodium chloride and potassium chloride solutions in the filtered water. This reduces the mineralization of the original filtered water; the solution is a material required for conventional drilling fluids and does not affect the various properties of the drilling fluid.

[0033] The removal of chloride ions and other substances from filter water with high-valence cations reduces the drilling fluid's zeta potential, high-temperature resistance, and filtration loss. Adding a high-efficiency drilling fluid compatibility agent restores the filter water's effect on these properties, making the filter water perform better than clean water in preparing drilling fluids.

[0034] Adding sodium carboxymethyl cellulose, a filtration loss reducer, lowers the filtration loss of the drilling fluid and prevents excessive water seepage into the formation. Depending on the specific drilling geological conditions and operational requirements, other functional additives are added. In easily collapsible formations, polysulfonated methyl phenolic resin, an anti-collapse agent, is added; in high-temperature and high-pressure environments, sulfonated asphalt, a high-temperature stabilizer, is added.

[0035] Furthermore, in step 6), the temperature is raised to 60-80℃, and the reaction time is 2-6 hours.

[0036] Furthermore, in step 7), the spray drying inlet temperature is controlled at 100-200℃ and the outlet temperature is controlled at 50-90℃.

[0037] Furthermore, in step (2), the flow rate of the above-mentioned strongly acidic cation exchange resin column is 2-5 m / h.

[0038] The beneficial effects of adopting the above-mentioned further technical solutions are: using ion exchange resin to remove some cations such as calcium, magnesium, aluminum and iron ions from water, thereby reducing water hardness.

[0039] Furthermore, in step (2), the zeolite adsorption time is 20-30 minutes; the acid-base regulator is sodium hydroxide or hydrochloric acid.

[0040] Furthermore, in step (2), the stirring speed is 300-500 r / min and the stirring time is 2-3 hours.

[0041] The present invention also provides an application of the pressure-filtered improved water produced by the above method in the preparation of drilling fluid. Detailed Implementation

[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] In this embodiment of the invention, the drilling fluid is a conventional second- to fourth-stage drilling fluid, JD-6 is a type of filtration loss reducer, WFB is a type of anti-collapse lubricant, KPAM is potassium polyacrylamide, LS-2 is a type of filtration loss reducer, and NH4PAN is hydrolyzed polyacrylonitrile ammonium salt.

[0044] Example 1

[0045] A method for producing improved filter water from well water includes the following steps:

[0046] (1) Pretreatment of drilling filter water: The drilling filter water is introduced into a high-efficiency sedimentation tank, and flocculant polyacrylamide is added for natural sedimentation for 3 hours. The addition amount is 5mg of polyacrylamide per 1L of drilling filter water. Then, the supernatant after sedimentation is filtered through a quartz sand layer with a particle size of 0.5-2mm and a layer thickness of 0.5m at a filtration speed of 8m / h. Then, activated carbon is used for filtration. Granular activated carbon is used for activated carbon filtration, and the contact time is 20 minutes.

[0047] (2) Water purification and adjustment: The pretreated drilling filter water from step (1) is mixed with a high-efficiency ion exchanger to obtain a precipitate. The filtrate is then filtered and passed through a strong acid cation exchange resin column at a flow rate of 3 m / h. It is then adsorbed through zeolite for 30 minutes and filtered to obtain purified water. Sodium hydroxide is added to the purified water to adjust the pH to 7.5. Finally, a high-efficiency drilling fluid compatible stabilizer is added, and the mixture is placed in a mixing tank and stirred until homogeneous at a stirring speed of 400 r / min for 2.5 hours to obtain improved filter water. Each 1 m 3 Step (1) Add 12 kg of high-efficiency ion exchanger and 3 kg of high-efficiency drilling fluid compatible stabilizer to the pretreated drilling filter water; the high-efficiency ion exchanger includes sodium carbonate, sodium bicarbonate, sodium oxalate tetraacetate and potassium carbonate, and the mass ratio of sodium carbonate, sodium bicarbonate, sodium oxalate tetraacetate and potassium carbonate is 1:0.5:0.5:1.

[0048] The preparation method of a high-efficiency drilling fluid compatible stabilizer includes the following steps:

[0049] A high-efficiency drilling fluid compatible stabilizer is obtained by mixing a multi-component copolymer dry powder, sodium carboxymethyl cellulose and polysulfonyl phenolic resin, or by mixing a multi-component copolymer dry powder, sodium carboxymethyl cellulose and sulfonated asphalt.

[0050] The preparation method of multi-component copolymer dry powder includes the following steps:

[0051] 1) Weigh out 250 kg of water, 17 kg of methacrylamide, 9 kg of 3-cyclohexylpropionic acid, 5 kg of hydroxymethyl cellulose, 3 kg of EDTA, 0.12 kg of potassium persulfate, and 0.17 kg of sodium bisulfite;

[0052] 2) Add methacrylamide to the water while stirring, and stir until the methacrylamide is completely dissolved;

[0053] 3) Continue stirring while adding 3-cyclohexylpropionic acid, stirring until the 3-cyclohexylpropionic acid is completely dissolved;

[0054] 4) Continue stirring while adding hydroxymethyl cellulose, stirring until the hydroxymethyl cellulose is completely dissolved;

[0055] 5) Continue stirring while adding EDTA. After the EDTA is added, add potassium persulfate and sodium bisulfite after a 1-minute interval to obtain a mixture;

[0056] 6) The mixture was heated to 70°C and reacted for 4 hours to obtain a multi-component copolymer;

[0057] 7) The multi-component copolymer is spray-dried to produce multi-component copolymer dry powder. The inlet temperature of the spray dryer is controlled at 150℃ and the outlet temperature is controlled at 70℃.

[0058] Location: Gaoshi 045-H8.

[0059] Example 1: Pressure-filtered improved water (denoted as a): Cl - Concentration 62000 mg / L, Ca 2+ Concentration 0 mg / L, Mg 2+ 0 mg / L, AL 3+ 0.05 mg / L, Fe 3+ 0.12 mg / L, Fe 2+ 0.13 mg / L.

[0060] Well slurry (denoted as b): KCl-polymer system, Cl - Concentration 50000 mg / L, Ca 2+ Concentration 1400 mg / L;

[0061] Comparative Example 1 Drilling fluid (denoted as c): includes well mud, gel and stone powder to restore density. The mass of the gel accounts for 10% of the well mud. The gel includes water and 3% KCL, 0.2% KPAM, 0.5% LS-2 and 1% NH4PAN, which account for 1% of the mass of the water.

[0062] Example 1 Drilling fluid (denoted as d): includes well slurry, gel, and stone powder to restore density. The mass of the gel accounts for 10% of the well slurry. The gel includes filter-modified water and 3% KCL, 0.2% KPAM, 0.5% LS-2, and 1% NH4PAN, which account for 3% of the mass of the filter-modified water.

[0063] Table 1 Comparison of Compatibility Results of Filter Press Improved Water and KCL Polymer Drilling Fluid

[0064]

[0065] Conclusion: The treatment performance of the filter-modified water solution with the same components is basically the same as that of the clear water solution. The filter-modified water solution has good compatibility with KCL-polymer, does not change the zeta potential of the drilling fluid, and has no adverse effects on the drilling fluid.

[0066] The methods for producing improved filter water using well water in Examples 2-6 are exactly the same as those in Example 1.

[0067] Example 2

[0068] Location: Gaoshi 018-H5.

[0069] Example 2: Pressure-filtered improved water (denoted as a): Cl - Concentration 60000 mg / L, Ca 2+ Concentration 2 mg / L, Mg 2+ 0.01 mg / L, AL 3+ 0.025 mg / L, Fe 3+ 0.05 mg / L, Fe 2+ 0.07 mg / L.

[0070] Well slurry (denoted as b): Potassium polysulfonate system, Cl - Concentration 59000 mg / L, Ca 2+ Concentration 200 mg / L;

[0071] Comparative Example 2 Drilling fluid (denoted as c): includes well mud, gel, JD-6, WFB and stone powder to restore density. The mass of gel accounts for 5% of the well mud, the mass of JD-6 accounts for 2% of the well mud, and the mass of WFB accounts for 2% of the well mud. Among them, the gel includes water and 3% KCl, 10% JD-6, 8% WFB and 0.3% NaOH, which account for 3% of the mass of water.

[0072] Example 2 Drilling fluid (denoted as d): includes well mud, gel, JD-6, WFB and stone powder to restore density. The mass of gel accounts for 5% of the well mud, the mass of JD-6 accounts for 2% of the well mud, and the mass of WFB accounts for 2% of the well mud. The gel includes filter press water and 3% KCL, 10% JD-6, 8% WFB and 0.3% NaOH, accounting for 3% of the mass of filter press water.

[0073] Table 2 Comparison of Compatibility Results of Filter Press Improved Water and Potassium Polysulfonate Drilling Fluid

[0074]

[0075] Conclusion: Filtration-modified water does not affect the high-temperature performance of drilling fluid or damage its colloidal properties; however, it is slightly inferior to clean water in reducing viscosity and shear rate.

[0076] Example 3

[0077] Location: Gaoshi 009-H22

[0078] Example 3: Filter-treated water (denoted as a); Example 2: Filter-treated water (denoted as a); Cl -Concentration 48000 mg / L, Ca 2+ Concentration 0 mg / L, Mg 2+ 0.01 mg / L, AL 3+ 0.04 mg / L, Fe 3+ 0.03 mg / L, Fe 2+ 0.05 mg / L.

[0079] Well slurry (denoted as b): Potassium polysulfonate system, Cl - Concentration 40000 mg / L, Ca 2+ Concentration 250 mg / L;

[0080] Comparative Example 3 Drilling Fluid (denoted as c): Well mud, gel and stone powder restored density, the mass of gel accounted for 10% of the well mud, wherein the gel included clean water and filter-modified water in a mass ratio of 1:1, and also included 15% JD-6, 10% WFB and 0.2% NaOH, accounting for 15% of the total mass of clean water and filter-modified water.

[0081] Example 3 Drilling fluid (denoted as d):

[0082] The density recovery includes well slurry, adhesive, and stone powder. The adhesive accounts for 10% of the well slurry mass. The adhesive includes filter press improved water and 15% JD-6 and 10% WFB by mass of the filter press improved water.

[0083] Table 3. Comparison of compatibility between filter-modified water and potassium polysulfonate drilling fluid.

[0084]

[0085] Conclusion: Filtration-modified water does not affect the high-temperature performance of drilling fluid or damage its colloidal properties; however, it is slightly inferior to clean water in reducing viscosity and shear rate.

[0086] Example 4

[0087] Location: Gaoshi 009-H18

[0088] Example 4: Pressure-filtered improved water (denoted as a); Cl - Concentration 50000 mg / L, Ca 2+ Concentration 0 mg / L, Mg 2+ 0.02 mg / L, AL 3+ 0 mg / L, Fe 3+ 0.03 mg / L, Fe 2+ 0.15 mg / L.

[0089] Well slurry (denoted as b): Potassium polysulfonate system, Cl - Concentration 59000 mg / L, Ca 2+ Concentration 200 mg / L;

[0090] Comparative Example 4 Drilling Fluid (denoted as c): well mud and gel, the gel accounting for 20% of the well mud mass, the gel including water and 5% KCl, 5% NaCl, 15% JD-6, 8% WFB and 0.5% NaOH accounting for 5% of the water mass.

[0091] Example 4 Drilling fluid (denoted as d): well mud and gel, the gel accounting for 20% of the mass of the well mud, the gel including filter-modified water and 15% JD-6 and 8% WFB accounting for 8% of the mass of the filter-modified water.

[0092] Table 4. Comparison of compatibility between filter-modified water and potassium polysulfonate drilling fluid.

[0093]

[0094] Conclusion: Filtration-modified water does not affect the high-temperature performance of drilling fluid or damage its colloidal properties; however, it is slightly inferior to clean water in reducing viscosity and shear rate.

[0095] Example 5

[0096] Location: Gaoshi 009-H17

[0097] Example 5: Pressure-filtered improved water (denoted as a): Cl - Concentration 32000 mg / L, Ca 2+ Concentration 0 mg / L, Mg 2+ 0.01 mg / L, AL 3+ 0 mg / L, Fe 3+ 0 mg / L, Fe 2+ 0.05 mg / L.

[0098] Well slurry (denoted as b): Potassium polysulfonate system, Cl - Concentration 30000 mg / L, Ca 2+ Concentration 200 mg / L;

[0099] Comparative Example 5 Drilling Fluid (denoted as c): This group of experiments does not compare the clean water and gel. It observes whether the key parameters of the maintenance slurry prepared with modified filter water can be restored with lime and whether other important indicators meet the requirements.

[0100] Example 5 Drilling fluid (denoted as d): includes well slurry, gel, and stone powder to restore density. The gel accounts for 20% of the mass of the well slurry. The gel includes filter press modified water and 12% JD-6 and 6% WFB, which account for 12% of the mass of the filter press modified water.

[0101] Table 5. Compatibility Test Results of Filter Press Improved Water-Potassium Polysulfonate Drilling Fluid

[0102]

[0103] Conclusion: Drilling fluid prepared with filter-modified water has adjustable and controllable properties.

[0104] Example 6

[0105] Location: Penglai 001-35-H1

[0106] Example 6: Pressure-filtered improved water (denoted as a): Cl - Concentration 50000 mg / L, Ca 2+ Concentration 5 mg / L, Mg 2+ 0.01 mg / L, AL 3+ 0 mg / L, Fe 3+ 0.5 mg / L, Fe 2+ 0.05 mg / L.

[0107] Well slurry (denoted as b): an organic salt polysulfonate system, Cl - Concentration 60000 mg / L, Ca 2+ Concentration 150 mg / L;

[0108] Comparative Example 6 Drilling Fluid (denoted as c): It includes well mud and gel, with the gel accounting for 20% of the mass of the well mud. The gel includes water and 5% KCl, 5% NaCl, 15% JD-6, 8% WFB and 0.5% NaOH, accounting for 15% of the mass of the water.

[0109] Example 6 Drilling fluid (denoted as d): includes well slurry and gel, the gel accounting for 20% of the mass of well slurry, the gel including filter-modified water and 15% JD-6 and 8% WFB accounting for 8% of the mass of filter-modified water.

[0110] Table 6. Comparison of compatibility between filter-modified water and potassium polysulfonate drilling fluid.

[0111]

[0112] Conclusion: The effect of filter-modified water on the high-temperature water loss of organic salt polysulfonate drilling fluid is small, and its effect on reducing viscosity is slightly inferior to that of clean water.

[0113] In summary, the filter-modified water of this invention exhibits good compatibility with drilling fluids and has no adverse effects on them. The ratio of filter-modified water to clean water can be adjusted to prepare adhesive solutions for reuse, depending on the drilling fluid system, density, and rheological properties required. The apparent viscosity of filter-modified water is five times that of clean water, meaning it has a higher liquid-phase viscosity. Therefore, the viscosity reduction of filter-modified water adhesive solutions with the same composition is slightly less than that of clean water adhesive solutions. Consequently, the ratio of filter-modified water to clean water can be adjusted to prepare adhesive solutions for reuse, depending on the drilling fluid system, density, and rheological properties required. The filter-modified water adhesive solution shows minimal impact on the high-temperature water loss of drilling fluids of different systems and densities, remaining within an acceptable range.

[0114] The performance testing methods in Tables 1-6 refer to GB / T16783.1-2014 "Field Testing of Drilling Fluids for Petroleum and Natural Gas Industry - Part 1: Water-based Drilling Fluids".

[0115] The description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily 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 invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for producing improved filter water using well water, characterized in that, Includes the following steps: (1) Pretreatment of drilling filter water: The drilling filter water is introduced into a high-efficiency sedimentation tank, flocculant is added for natural sedimentation, and then the supernatant after sedimentation is subjected to sand filtration and activated carbon filtration in sequence. (2) Water purification and adjustment: The pretreated drilling filter water from step (1) is mixed with a high-efficiency ion exchanger to obtain a precipitate. The filtrate is filtered and passed through a strong acid cation exchange resin column, and then through zeolite for adsorption filtration to obtain purified water. Then, an acid-base regulator is added to the purified water to adjust the pH value to 7-10. Finally, a high-efficiency drilling fluid compatible stabilizer is added and placed in a mixing tank for stirring and mixing to obtain the improved filter water.

2. The method for producing improved filter water using well water pressure as described in claim 1, characterized in that, In step (1), the flocculant is polyacrylamide, and the addition amount is 5-10 mg of polyacrylamide per 1 L of drilling filter water.

3. The method for producing improved filter water using well water pressure as described in claim 1, characterized in that, In step (1), the precipitation time is 2-4 hours.

4. The method for producing improved filter water using well water pressure as described in claim 1, characterized in that, In step (1), the sand filter uses quartz sand with a particle size of 0.5-2mm and a filtration speed of 5-10m / h; the activated carbon filter uses granular activated carbon and the contact time is 15-30 minutes.

5. The method for producing improved filter water using well water pressure as described in claim 1, characterized in that, In step (2), every 1m 3 Step (1) Add 10-15 kg of high-efficiency ion exchanger and 1-5 kg ​​of high-efficiency drilling fluid compatible stabilizer to the pretreated drilling filter water; The high-efficiency ion exchanger comprises sodium carbonate, sodium bicarbonate, sodium oxalate tetraacetate, and potassium carbonate, wherein the mass ratio of sodium carbonate, sodium bicarbonate, sodium oxalate tetraacetate, and potassium carbonate is 1:0.5:0.5:

1. The preparation method of the high-efficiency drilling fluid compatible stabilizer includes the following steps: A high-efficiency drilling fluid compatible stabilizer is obtained by mixing a multi-component copolymer dry powder, sodium carboxymethyl cellulose and polysulfonyl phenolic resin, or by mixing a multi-component copolymer dry powder, sodium carboxymethyl cellulose and sulfonated asphalt. The preparation method of the multi-component copolymer dry powder includes the following steps: 1) Weigh the following raw materials according to the following mass parts: water 200-300 parts, methacrylamide 12.5-20.8 parts, 3-cyclohexylpropionic acid 8.2-10.7 parts, hydroxymethyl cellulose 3.5-6.5 parts, EDTA 0.2-6.5 parts, potassium persulfate 0.1-0.15 parts, sodium bisulfite 0.15-0.2 parts; 2) Add methacrylamide to the water while stirring, and stir until the methacrylamide is completely dissolved; 3) Continue stirring while adding 3-cyclohexylpropionic acid, stirring until the 3-cyclohexylpropionic acid is completely dissolved; 4) Continue stirring while adding hydroxymethyl cellulose, stirring until the hydroxymethyl cellulose is completely dissolved; 5) Continue stirring while adding EDTA. After the EDTA is added, add potassium persulfate and sodium bisulfite after a 1-minute interval to obtain a mixture; 6) The mixture is heated to react, yielding a multi-component copolymer; 7) The multi-component copolymer is spray-dried to produce multi-component copolymer dry powder.

6. The method for producing improved filter water using well water pressure as described in claim 1, characterized in that, In step 6), the temperature is raised to 60-80℃ and the reaction time is 2-6 hours.

7. The method for producing improved filter water from well water according to claim 1, characterized in that, In step 7), the spray drying inlet temperature is controlled at 100-200℃ and the outlet temperature is controlled at 50-90℃.

8. The method for producing improved filter water using well water pressure as described in claim 1, characterized in that, In step (2), the flow rate of the strongly acidic cation exchange resin column is 2-5 m / h.

9. The method for producing improved filter water from well water according to claim 1, characterized in that, In step (2), the zeolite adsorption time is 20-30 minutes; the acid-base regulator is sodium hydroxide or hydrochloric acid.

10. The use of filter-modified water produced by the method of any one of claims 1-9 in the preparation of drilling fluids.

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