A solidification material for oil and gas field abandoned drilling fluid and a method of using the same

Abstract

The application discloses a solidification material for oil and gas field abandoned drilling fluid and a use method thereof, and the solidification material comprises 40-65 wt.% of a gelling material A, 20-30 wt.% of a gelling material B, 5-10 wt.% of a reinforcing material and 10-20 wt.% of an adsorbing material in percentage by weight; the gelling material A is formed by mixing sulphoaluminate cement and ferrialuminate cement at a mass ratio of 3:1; the gelling material B is formed by mixing lithium slag, chlorite and zirconium-silicon slag at a mass ratio of 3:1:1; the reinforcing material is formed by mixing quaternary ammonium silicate, triethanolamine and lithium hydroxide at a mass ratio of 1:2:(3-5); and the adsorbing material is formed by mixing expanded graphite, protein shale and diaspore at a mass ratio of (2-3):1:1. The abandoned drilling fluid treated by the solidification material and the use method thereof can effectively control the leaching of pollutants, and has fast solidification strength development, high solidification strength and obvious solidification effect.

Description

Technical Field

[0001] This invention relates to the field of oil and gas field drilling fluid technology, specifically to a solidification material for waste drilling fluid in oil and gas fields and its application method. Background Technology

[0002] With the rapid development of China's petroleum industry, drilling, as a preliminary engineering process for oil and gas extraction, generates a large amount of waste drilling fluid. Waste drilling fluid is alkaline and is a multiphase stable colloidal suspension system containing clay, various chemical treatment agents, wastewater, oily waste, and drill cuttings, as well as certain heavy metals and weighting materials. Long-term accumulation of waste drilling fluid at well sites severely damages surface vegetation, pollutes soil and water sources, and causes environmental pollution. Therefore, the comprehensive management of waste drilling fluid has become an urgent problem to be solved. Domestic and international waste drilling fluid treatment technologies mainly include chemical solidification treatment, enhanced solid-liquid separation technology, in-pit landfill, and injection into safe formations or annular spaces. Among these, solidification treatment technology has developed rapidly and is widely used in recent years as a harmless treatment technology.

[0003] Current solidification technologies often involve adding inorganic solidifying agents such as cement, fly ash, and lime to waste drilling fluids. This not only results in excessively large quantities of solidified material but also produces highly alkaline waste with generally low strength. Organic solidifying agents, on the other hand, require more complex treatment conditions and are more expensive, potentially causing secondary pollution. Furthermore, certain heavy metals in waste drilling fluids are difficult to control within national emission limits. Therefore, developing a high-efficiency, high-strength solidifying agent for waste drilling fluids that meets national emission standards is extremely urgent. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a solidification material for waste drilling fluid in oil and gas fields and its application method, so as to at least solve some of the above-mentioned technical problems.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A solidification material for waste drilling fluid in oil and gas fields, comprising the following components by weight percentage:

[0007] Cementitious material A: 40-65 wt.%;

[0008] Cementitious material B: 20-30 wt.%;

[0009] Reinforcing material: 5-10 wt.%;

[0010] Adsorbent material: 10-20 wt.%;

[0011] The cementitious material A is a mixture of sulfoaluminate cement and ferroaluminate cement in a mass ratio of 3:1.

[0012] The cementitious material B is a mixture of lithium slag, chlorite, and zirconium silicon slag in a mass ratio of 3:1:1.

[0013] The reinforcing material is composed of quaternary ammonium silicate, triethanolamine, and lithium hydroxide mixed in a mass ratio of 1:2:(3-5);

[0014] The adsorbent material is composed of expanded graphite, protein shale, and diaspore mixed in a mass ratio of (2-3):1:1.

[0015] Furthermore, the specific surface area of ​​the sulfoaluminate cement is 410-430 m². 2 / kg, alkalinity pH value 9.8; the specific surface area of ​​the aluminoferrite cement is 380-410m². 2 / kg.

[0016] Furthermore, the lithium slag contains not less than 50 wt.% SiO2 and not less than 20 wt.% Al2O3, and the particle size of the lithium slag is 2-10 μm.

[0017] Furthermore, the chlorite is a layered silicate mineral, mainly composed of SiO2, MgO and Al2O3, with a total content of 65-75 wt.% for SiO2, MgO and Al2O3, and a particle size of 5-15 μm.

[0018] Furthermore, the main component of the zirconium silicon slag is amorphous SiO2, and the SiO2 content is not less than 80 wt.%.

[0019] Furthermore, the quaternary ammonium silicate is a white solid powder with a purity > 99%; the triethanolamine is a colorless oily liquid with a purity > 95%; and the lithium hydroxide is a white powder with a purity > 85%.

[0020] Furthermore, the specific surface area of ​​the expanded graphite is 130-150 m². 2 / g.

[0021] Furthermore, the protein shale has a particle size of 35-50 μm, and its main component is amorphous active silica.

[0022] Furthermore, the purity of the diatomite is >90wt.% and the average particle size is 5-10μm.

[0023] This invention also provides a method for using a solidified material for waste drilling fluid in oil and gas fields, comprising the following steps:

[0024] S1: Calculate the weight of the solidified material based on 15-30 wt.% of the weight of the waste drilling fluid, and weigh the corresponding weights of cementing material A, cementing material B, adsorbent material and reinforcing material according to each weight percentage.

[0025] S2: Add the reinforcing material to the waste drilling fluid and stir for 20-40 minutes to obtain waste drilling fluid solidified slurry 1. The reinforcing material is fully dissolved and releases effective ions, which increases the alkalinity of the liquid phase environment of the waste drilling fluid and promotes the release of harmful ions in the waste drilling fluid.

[0026] S3: Add the adsorbent material to the waste drilling fluid solidification slurry 1 and stir for 50-80 minutes to obtain waste drilling fluid solidification slurry 2. Under the action of the reinforcing material, the adsorbent material enables the harmful ions to be initially adsorbed and fixed.

[0027] S4: Add cementitious material B to waste drilling fluid solidified slurry 2 and stir until uniform to obtain waste drilling fluid solidified slurry 3. Under the action of reinforcing material, the release of active ions in cementitious material B is promoted.

[0028] S5: Add cementitious material A to waste drilling fluid solidification slurry 3 and stir until uniform. Let it stand until solidified. The hydration reaction of cementitious material A is accelerated under the action of the reinforcing material. The active ions in cementitious material B further promote the hydration reaction of cementitious material A and the role of the reinforcing material.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The reinforcing material of the present invention has a synergistic promoting effect on the adsorbent material, cementing material B and cementing material A.

[0031] The reinforcing material is easily soluble in water and becomes highly alkaline after dissolution, which increases the alkalinity of the waste drilling fluid system. On the one hand, this disrupts the stability of the waste drilling fluid system and the surface structure of the adsorbent material, which facilitates the adsorption and fixation of harmful ions by the adsorbent material. On the other hand, it can destroy the structure of the cementitious material B and promote the release of its active ions.

[0032] Li in lithium hydroxide in reinforcing materials + With its small radius and strong polarization, it accelerates the rupture of the hydration protective film, better promoting the early strength development of cement with high alumina phase content (cementing material A), and helps hydration products form a denser microstructure, reducing their permeability. Triethanolamine in the reinforcing material not only promotes the reaction of the aluminum phase but also promotes the complexation of the iron phase, which is difficult to react in the cement system, thus accelerating the hydration process of ferrates in cementing material A.

[0033] The synergistic effect of the reinforcing materials greatly accelerates the hydration reaction of cementitious material A and the release of active ions from cementitious material B. The release of active ions from cementitious material B further promotes the hydration of cementitious material A and the synergistic effect of the reinforcing materials, resulting in curing with characteristics such as rapid strength development, high early strength, low permeability, and good water resistance.

[0034] 2. The expanded graphite in the adsorbent material of this invention has the characteristics of large specific surface area and good toughness. On the one hand, it can provide nucleation sites for hydration products, promoting their formation; on the other hand, it can quickly adsorb oils, organic molecules, and harmful substances in waste drilling fluid, and can also prevent cracking of the solidified body after the waste drilling fluid has solidified. The protein shale and gibbsite in the adsorbent material have a loose and porous structure with a large specific surface area, enabling them to quickly adsorb harmful substances and heavy metal ions in waste drilling fluid during stirring, reducing the migration of heavy metal ions; they can also release Si in an alkaline environment. 4+ And Al 3+ The active ions further promote the hydration of cementitious material A. Furthermore, the rapid solidification of cementitious material A forms hydrated alumina, calcium silicate hydrate, alumina, and other hydration products, which can fix some harmful substances in the crystal structure. It can also form a strong bond with adsorbent materials, effectively hindering the re-leaching and diffusion of harmful substances and heavy metal ions.

[0035] 3. The cementitious material A of this invention is a mixture of sulfoaluminate cement and ferroaluminate cement in a certain proportion, and has the characteristics of rapid early strength development, low permeability, low alkalinity, and good corrosion resistance. Because the waste drilling fluid solidified slurry 3 after steps S2, S3, and S4 contains a large amount of Si... 4+ And Al 3+ After the addition of cementitious material A, the reaction rate of the aluminum phase is inhibited at the beginning of hydration, thereby promoting the reaction between triethanolamine and the difficult-to-hydrate iron phase. The iron phase reaction also drives the aluminum phase reaction, enhancing early strength while preventing the decline in strength of the solidified body in the later stages. Cementitious material B is a combination of lithium slag, chlorite, and zirconium silicate slag. On the one hand, cementitious material B has pozzolanic activity, which can participate in and promote the hydration reaction of cementitious material A; on the other hand, the small particle size of each component of cementitious material B can act as seed crystals to nucleate and promote the early strength development of the solidified body. In addition, since lithium slag and zirconium silicate slag are acidic after water leaching, their incorporation can significantly reduce the pH of the solidified waste drilling fluid. Furthermore, the zirconium silicate slag contains some sodium silicate, which can effectively activate the lithium slag activity, not only enabling faster conversion of C2S to C3S in cementitious material A, accelerating cement hydration, but also working together with the quaternary ammonium silicate in the reinforcing material to improve the water resistance of the solidified body and prevent pollutants from leaching out. Chlorite has a layered structure, and zirconium silicon slag has a high specific surface area and abundant pore structure. Both can adsorb harmful substances and heavy metal ions, thus synergistically enhancing the curing ability of the curing material to remove harmful substances.

[0036] 4. Based on the principle of synergistic effect, this invention combines various effective components in appropriate proportions and employs the application method of this invention to fully utilize the characteristics and synergistic effects of each component, enhance the dissociation and release of active substances, and reduce the impact of organic matter and pollutants on the solidification of the solidified body. This results in the solidified material of this invention possessing characteristics such as being environmentally friendly, having good early strength, high cured strength, and low alkalinity after curing. The leachate from the solidified waste drilling fluid treated with the solidified material of this invention exhibits the following properties: pH, chemical oxygen demand (COD), petroleum hydrocarbons, color, and Cr. 6+ The measured values ​​of Hg and Pb meet the Class II pollutant Class I discharge standard of GB 8978-1996 "Integrated Wastewater Discharge Standard", which greatly reduces the environmental pollution caused by the accumulation of waste drilling fluid. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the embodiments. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0038] The specific surface area of ​​the sulfoaluminate cement described in this embodiment of the invention is 410-430 m². 2 / kg, alkalinity pH value 9.8; the specific surface area of ​​the aluminoferrite cement is 380-410m². 2 / kg; the lithium slag contains not less than 50 wt.% SiO2 and not less than 20 wt.% Al2O3, and the particle size of the lithium slag is 2-10 μm; the chlorite is a layered silicate mineral, mainly composed of SiO2, MgO and Al2O3, with a total content of 65-75 wt.% SiO2, MgO and Al2O3, and a particle size of 5-15 μm; the zirconium silicate slag is mainly composed of amorphous SiO2, with a SiO2 content of not less than 80 wt.%; the quaternary ammonium silicate is a white solid powder with a purity >99%; the triethanolamine is a colorless oily liquid with a purity >95%; the lithium hydroxide is a white powder with a purity >85%; the expanded graphite has a specific surface area of ​​130-150 m². 2 / g; the protein shale has a particle size of 35-50μm, and the main component of the protein shale is amorphous active silica; the diaspore has a purity of >90wt.% and an average particle size of 5-10μm.

[0039] Example 1

[0040] As a preferred embodiment of the present invention, the solidification material for waste drilling fluid in oil and gas fields and its specific composition are disclosed in Table 1.

[0041] Table 1

[0042] Components Weight percentage (wt%) Cementing material A 40 Cementing material B 30 Reinforcing materials 10 Adsorbent materials 20

[0043] In this embodiment, cementitious material A is composed of sulfoaluminate cement and ferroaluminate cement in a mass ratio of 3:1; cementitious material B is composed of lithium slag, chlorite and zirconium silicate slag in a mass ratio of 3:1:1; reinforcing material is composed of quaternary ammonium silicate, triethanolamine and lithium hydroxide in a mass ratio of 1:2:3; and adsorbent material is composed of expanded graphite, protein shale and gibbsite in a mass ratio of 2:1:1.

[0044] The specific method for using the curing material in this embodiment is as follows:

[0045] S1: Calculate the weight of solidified material based on 25 wt.% of the weight of waste drilling fluid, and weigh the corresponding weights of cementitious material A, cementitious material B, adsorbent material and reinforcing material according to each weight percentage;

[0046] S2: Add the reinforcing material to the waste drilling fluid and stir with a mixer for 30 minutes to obtain waste drilling fluid solidified slurry 1;

[0047] S3: Add the adsorbent material to the waste drilling fluid solidification slurry 1 and stir with a stirrer for 60 minutes to obtain waste drilling fluid solidification slurry 2;

[0048] S4: Add cementitious material B to waste drilling fluid solidification slurry 2 and stir with a mixer until uniform to obtain waste drilling fluid solidification slurry 3;

[0049] S5: Add cementitious material A to waste drilling fluid solidification slurry 3, stir thoroughly and evenly with a mixer, and let it solidify for a period of time.

[0050] Example 2

[0051] As a preferred embodiment of the present invention, the solidification material for waste drilling fluid in oil and gas fields and its specific composition are disclosed in Table 2.

[0052] Table 2

[0053] Components Weight percentage (wt%) Cementing material A 50 Cementing material B 27 Reinforcing materials 7 Adsorbent materials 16

[0054] In this embodiment, cementitious material A is composed of sulfoaluminate cement and ferroaluminate cement in a mass ratio of 3:1; cementitious material B is composed of lithium slag, chlorite and zirconium silicate slag in a mass ratio of 3:1:1; reinforcing material is composed of quaternary ammonium silicate, triethanolamine and lithium hydroxide in a mass ratio of 1:2:3; and adsorbent material is composed of expanded graphite, protein shale and gibbsite in a mass ratio of 2:1:1.

[0055] The specific method for using the curing material in this embodiment is as follows:

[0056] S1: Calculate the weight of solidified material based on 25 wt.% of the weight of waste drilling fluid, and weigh the corresponding weights of cementitious material A, cementitious material B, adsorbent material and reinforcing material according to each weight percentage;

[0057] S2: Add the reinforcing material to the waste drilling fluid and stir with a mixer for 30 minutes to obtain waste drilling fluid solidified slurry 1;

[0058] S3: Add the adsorbent material to the waste drilling fluid solidification slurry 1 and stir with a stirrer for 60 minutes to obtain waste drilling fluid solidification slurry 2;

[0059] S4: Add cementitious material B to waste drilling fluid solidification slurry 2 and stir with a mixer until uniform to obtain waste drilling fluid solidification slurry 3;

[0060] S5: Add cementitious material A to waste drilling fluid solidification slurry 3, stir thoroughly and evenly with a mixer, and let it solidify for a period of time.

[0061] Example 3

[0062] As a preferred embodiment of the present invention, the solidification material for waste drilling fluid in oil and gas fields and its specific composition are disclosed in Table 3.

[0063] Table 3

[0064] Components Weight percentage (wt%) Cementing material A 65 Cementing material B 20 Reinforcing materials 5 Adsorbent materials 10

[0065] In this embodiment, cementitious material A is composed of sulfoaluminate cement and ferroaluminate cement in a mass ratio of 3:1; cementitious material B is composed of lithium slag, chlorite and zirconium silicate slag in a mass ratio of 3:1:1; reinforcing material is composed of quaternary ammonium silicate, triethanolamine and lithium hydroxide in a mass ratio of 1:2:3; and adsorbent material is composed of expanded graphite, protein shale and gibbsite in a mass ratio of 2:1:1.

[0066] The specific method for using the curing material in this embodiment is as follows:

[0067] S1: Calculate the weight of solidified material based on 25 wt.% of the weight of waste drilling fluid, and weigh the corresponding weights of cementitious material A, cementitious material B, adsorbent material and reinforcing material according to each weight percentage;

[0068] S2: Add the reinforcing material to the waste drilling fluid and stir with a mixer for 30 minutes to obtain waste drilling fluid solidified slurry 1;

[0069] S3: Add the adsorbent material to the waste drilling fluid solidification slurry 1 and stir with a stirrer for 60 minutes to obtain waste drilling fluid solidification slurry 2;

[0070] S4: Add cementitious material B to waste drilling fluid solidification slurry 2 and stir with a mixer until uniform to obtain waste drilling fluid solidification slurry 3;

[0071] S5: Add cementitious material A to waste drilling fluid solidification slurry 3, stir thoroughly and evenly with a mixer, and let it solidify for a period of time.

[0072] Example 4

[0073] As a preferred embodiment of the present invention, the solidification material for waste drilling fluid in oil and gas fields and its specific composition are disclosed in Table 4.

[0074] Table 4

[0075] Components Weight percentage (wt%) Cementing material A 65 Cementing material B 20 Reinforcing materials 5 Adsorbent materials 10

[0076] In this embodiment, cementitious material A is composed of sulfoaluminate cement and ferroaluminate cement in a mass ratio of 3:1; cementitious material B is composed of lithium slag, chlorite and zirconium silicate slag in a mass ratio of 3:1:1; reinforcing material is composed of quaternary ammonium silicate, triethanolamine and lithium hydroxide in a mass ratio of 1:2:3; and adsorbent material is composed of expanded graphite, protein shale and gibbsite in a mass ratio of 3:1:1.

[0077] The specific method for using the curing material in this embodiment is as follows:

[0078] S1: Calculate the weight of solidified material based on 15 wt.% of the weight of waste drilling fluid, and weigh the corresponding weights of cementitious material A, cementitious material B, adsorbent material and reinforcing material according to each weight percentage.

[0079] S2: Add the reinforcing material to the waste drilling fluid and stir with a mixer for 30 minutes to obtain waste drilling fluid solidified slurry 1;

[0080] S3: Add the adsorbent material to the waste drilling fluid solidification slurry 1 and stir with a stirrer for 60 minutes to obtain waste drilling fluid solidification slurry 2;

[0081] S4: Add cementitious material B to waste drilling fluid solidification slurry 2 and stir with a mixer until uniform to obtain waste drilling fluid solidification slurry 3;

[0082] S5: Add cementitious material A to waste drilling fluid solidification slurry 3, stir thoroughly and evenly with a mixer, and let it solidify for a period of time.

[0083] Example 5

[0084] As a preferred embodiment of the present invention, the solidification material for waste drilling fluid in oil and gas fields and its specific composition are disclosed in Table 5.

[0085] Table 5

[0086] Components Weight percentage (wt%) Cementing material A 40 Cementing material B 30 Reinforcing materials 10 Adsorbent materials 20

[0087] In this embodiment, cementitious material A is composed of sulfoaluminate cement and ferroaluminate cement in a mass ratio of 3:1; cementitious material B is composed of lithium slag, chlorite and zirconium silicate slag in a mass ratio of 3:1:1; reinforcing material is composed of quaternary ammonium silicate, triethanolamine and lithium hydroxide in a mass ratio of 1:2:5; and adsorbent material is composed of expanded graphite, protein shale and gibbsite in a mass ratio of 3:1:1.

[0088] The specific method for using the curing material in this embodiment is as follows:

[0089] S1: Calculate the weight of solidified material based on 30 wt.% of the weight of waste drilling fluid, and weigh the corresponding weights of cementitious material A, cementitious material B, adsorbent material and reinforcing material according to each weight percentage;

[0090] S2: Add the reinforcing material to the waste drilling fluid and stir with a mixer for 30 minutes to obtain waste drilling fluid solidified slurry 1;

[0091] S3: Add the adsorbent material to the waste drilling fluid solidification slurry 1 and stir with a stirrer for 60 minutes to obtain waste drilling fluid solidification slurry 2;

[0092] S4: Add cementitious material B to waste drilling fluid solidification slurry 2 and stir with a mixer until uniform to obtain waste drilling fluid solidification slurry 3;

[0093] S5: Add cementitious material A to waste drilling fluid solidification slurry 3, stir thoroughly and evenly with a mixer, and let it solidify for a period of time.

[0094] Comparative Example 1

[0095] This comparative example is identical to Example 1 except that it does not contain cementitious material B.

[0096] Comparative Example 2

[0097] This comparative example is identical to Example 1 except that it does not contain triethanolamine.

[0098] Comparative Example 3

[0099] This comparative example is identical to Example 1 except that it does not contain expanded graphite.

[0100] Comparative Example 4

[0101] This comparative example is identical to Example 1 except that it does not contain protein shale and gibbsite.

[0102] Test case

[0103] The leachate of the solidified waste drilling fluid obtained by the above embodiments and comparative examples was tested, and the unsolidified waste drilling fluid was compared and tested. The test results are shown in Table 6.

[0104] Table 6

[0105]

[0106] According to the test results in Table 6, after treatment with the solidification material of this invention, the pH, COD, petroleum hydrocarbons, color, and Cr content in the leachate of the solidified drilling mud are significantly reduced. 6+ The measured values ​​of Hg and Pb not only meet the reference standard (GB 8978-1996 Integrated Wastewater Discharge Standard, Class II Pollutant Level 1 Discharge Standard), but are also significantly higher than the measured values ​​of the solidified drilling mud treated in the comparative proportion. This indicates that the solidified material of the present invention can effectively control the leaching of pollutants under the synergistic effect of its components, and exhibits rapid development of solidification strength, high solidification strength, and obvious solidification effect.

[0107] Finally, it should be noted that the above embodiments are merely preferred embodiments of the present invention used to illustrate the technical solutions of the present invention, and are not intended to limit the invention, nor are they intended to limit the patent scope of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention. That is to say, any changes or refinements made to the main design concept and spirit of the present invention that are not of substantial significance, but whose technical problems are still consistent with the present invention, should be included within the protection scope of the present invention. In addition, the direct or indirect application of the technical solutions of the present invention to other related technical fields are similarly included within the patent protection scope of the present invention.

Claims

1. A solidification material for waste drilling fluid in oil and gas fields, characterized in that, Includes components in the following weight percentages: Cementitious material A: 40-65 wt.%; Cementitious material B: 20-30 wt.%; Reinforcing material: 5-10 wt.%; Adsorbent material: 10-20 wt.%; The cementitious material A is a mixture of sulfoaluminate cement and ferroaluminate cement in a mass ratio of 3:

1. The cementitious material B is a mixture of lithium slag, chlorite, and zirconium silicon slag in a mass ratio of 3:1:

1. The reinforcing material is composed of quaternary ammonium silicate, triethanolamine, and lithium hydroxide mixed in a mass ratio of 1:2:(3-5); The adsorbent material is composed of expanded graphite, protein shale, and diaspore mixed in a mass ratio of (2-3):1:

1.

2. The solidification material for waste drilling fluid in oil and gas fields according to claim 1, characterized in that, The specific surface area of ​​the sulfoaluminate cement is 410-430 m². 2 / kg, alkalinity pH value 9.8; the specific surface area of ​​the aluminoferrite cement is 380-410m². 2 / kg.

3. The solidification material for waste drilling fluid in oil and gas fields according to claim 1, characterized in that, The lithium slag contains not less than 50 wt.% SiO2 and not less than 20 wt.% Al2O3, and the particle size of the lithium slag is 2-10 μm.

4. A solidification material for waste drilling fluid in oil and gas fields according to claim 1, characterized in that, The chlorite is a layered silicate mineral, mainly composed of SiO2, MgO and Al2O3, with a total content of 65-75 wt.% and a particle size of 5-15 μm.

5. A solidification material for waste drilling fluid in oil and gas fields according to claim 1, characterized in that, The main component of the zirconium silicon slag is amorphous SiO2, and the SiO2 content is not less than 80 wt.%.

6. A solidification material for waste drilling fluid in oil and gas fields according to claim 1, characterized in that, The quaternary ammonium silicate is a white solid powder with a purity > 99%; the triethanolamine is a colorless oily liquid with a purity > 95%; and the lithium hydroxide is a white powder with a purity > 85%.

7. A solidification material for waste drilling fluid in oil and gas fields according to claim 1, characterized in that, The specific surface area of ​​the expanded graphite is 130-150 m². 2 / g.

8. A solidification material for waste drilling fluid in oil and gas fields according to claim 1, characterized in that, The protein shale has a particle size of 35-50 μm, and its main component is amorphous active silica.

9. A solidification material for waste drilling fluid in oil and gas fields according to claim 1, characterized in that, The purity of the diaspore is >90wt.%, and the average particle size is 5-10μm.

10. A method for using a solidification material for waste drilling fluid in oil and gas fields according to any one of claims 1 to 9, characterized in that, Includes the following steps: S1: Calculate the weight of the solidified material based on 15-30 wt.% of the weight of the waste drilling fluid, and weigh the corresponding weights of cementing material A, cementing material B, adsorbent material and reinforcing material according to each weight percentage. S2: Add the reinforcing material to the waste drilling fluid and stir for 20-40 minutes to obtain waste drilling fluid solidified slurry 1; S3: Add the adsorbent material to the waste drilling fluid solidification slurry 1 and stir for 50-80 minutes to obtain waste drilling fluid solidification slurry 2; S4: Add cementitious material B to waste drilling fluid solidification slurry 2 and stir until uniform to obtain waste drilling fluid solidification slurry 3; S5: Add cementitious material A to waste drilling fluid solidification slurry 3 and stir until uniform, then let it stand until solidified.

Images