Water-based mud drilling cutting composite drying and curing agent and use method thereof

Abstract

The invention discloses a water-based mud drilling cutting composite drying and curing agent and a use method thereof, and belongs to the technical field of drilling waste curing, and the water-based mud drilling cutting composite drying and curing agent comprises the following raw materials in parts by mass: an agent A: 15-20 parts of cement, 1-3 parts of sodium silicate, 1-3 parts of sodium dodecyl naphthalene sulfonate, 3-8 parts of silicon dioxide and 5-10 parts of polyvinyl alcohol fiber; 3-7 parts of carboxymethyl cellulose, 4-7 parts of aluminum sulfate and 3-5 parts of polyferric sulfate; and an agent B: 5-10 parts of calcium formate, 5-10 parts of calcium oxide, 1-3 parts of magnesium oxide, 2-4 parts of ferric chloride, 10-15 parts of bentonite, 10-15 parts of fly ash, 1-3 parts of phthalic anhydride and 3-5 parts of an MT-18 heavy metal trapping agent. The water-based mud drilling cutting composite drying and curing agent is obtained by compounding the specific raw materials according to the specific ratio, the curing time can be obviously shortened, the using amount of the drying and curing agent is reduced, the drying and curing effect is excellent, and the drying and curing agent is suitable for wide application.

Description

Technical Field

[0001] The invention relates to the technical field of drilling waste solidification, and more particularly to a water-based mud drilling cuttings composite desiccant and a use method thereof. Background Art

[0002] According to the composition characteristics of the fluid medium and system in the drilling mud, the drilling mud can be divided into four categories: water-based drilling mud, oil-based drilling mud, gas-type drilling mud, and synthetic-based drilling mud. Among them, water-based drilling mud is the most widely used and has always occupied a dominant position in drilling mud. The solidification treatment technology of waste drilling mud is a harmless treatment technology for waste drilling mud developed in recent years. The principle is to add a dry solidifying agent with consolidation properties to the waste drilling mud to transform it into a solidified body similar to concrete, and consolidate the harmful components in it, such as heavy metal ions, organic matter, oils, etc., which can significantly reduce the infiltration into the soil, thereby reducing the impact and harm to the environment.

[0003] At present, the main comprehensive utilization technologies for drill cuttings are as follows: drill cuttings are used for building materials after solidification, such as brick making for well repair sites, and drill cuttings are used for planting vegetation after solidification. However, the existing water-based mud drill cuttings drying agent has a slow drying speed and is very difficult to dry. The most commonly used traditional method is to add cement, lime, fly ash, mineral powder, clay and other materials for solidification treatment, but the amount of addition is large, the effect is not ideal, the consumption of drilling waste is small, and the cost is high.

[0004] Therefore, how to develop a water-based mud drill cuttings composite desiccant and a method for using the same, which significantly shortens the curing time, requires less usage, is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] In view of this, the present invention provides a water-based mud drilling cuttings composite desiccant and a use method thereof.

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

[0007] A water-based mud drilling cuttings composite desiccant, comprising the following raw materials in parts by weight:

[0008] Agent A: 15-20 parts of cement, 1-3 parts of sodium silicate, 1-3 parts of sodium dodecylnaphthalene sulfonate, 3-8 parts of silicon dioxide, 5-10 parts of polyvinyl alcohol fiber, 3-7 parts of carboxymethyl cellulose, 4-7 parts of aluminum sulfate, 3-5 parts of polyferric sulfate;

[0009] Agent B: 5-10 parts of calcium formate, 5-10 parts of calcium oxide, 1-3 parts of magnesium oxide, 2-4 parts of ferric chloride, 10-15 parts of bentonite, 10-15 parts of fly ash, 1-3 parts of phthalic anhydride, and 3-5 parts of MT-18 heavy metal scavenger.

[0010] Furthermore, the water-based mud drilling cuttings composite desiccant comprises the following raw materials in parts by weight:

[0011] Agent A: 18 parts of cement, 2 parts of sodium silicate, 2 parts of sodium dodecylnaphthalene sulfonate, 5 parts of silicon dioxide, 8 parts of polyvinyl alcohol fiber, 5 parts of carboxymethyl cellulose, 5 parts of aluminum sulfate, 4 parts of polyferric sulfate;

[0012] Agent B: 8 parts of calcium formate, 8 parts of calcium oxide, 2 parts of magnesium oxide, 3 parts of ferric chloride, 12 parts of bentonite, 13 parts of fly ash, 2 parts of phthalic anhydride, and 4 parts of MT-18 heavy metal scavenger.

[0013] The beneficial effect of adopting the above further technical solution is as follows: the present invention has determined the best formula through a large number of experiments, and the water-based mud drill cuttings have the best drying effect.

[0014] Furthermore, the particle size of the silicon dioxide is 200-300 mesh, and the particle size of the fly ash is 200-300 mesh.

[0015] Furthermore, the diameter of the polyvinyl alcohol fiber is 50-80 μm and the length is 1-5 μm.

[0016] The present invention also provides a method for using a water-based mud drilling cuttings composite desiccant, comprising the following steps:

[0017] (1) Weighing various raw materials according to the above-mentioned water-based mud drilling cuttings composite desiccant;

[0018] (2) First add agent A and then agent B to the water-based mud cuttings, and stir them with a mixer until the mud changes from a flowing fluid to a loose soil state. Then stop stirring, let the material age and dry it in the sun to complete the drying.

[0019] Beneficial effects of the present invention: The present invention has simple use method, convenient operation and is suitable for wide application.

[0020] Furthermore, the mass ratio of the water-based mud cuttings, agent A and agent B is (320-380):(5-8):(10-15).

[0021] The beneficial effect of adopting the above further technical solution is that the water-based mud drill cuttings composite drying agent of the present invention has excellent drying effect, and only a small amount of drying agent is needed to achieve the required drying effect, thereby reducing the dosage and application cost.

[0022] Furthermore, the stirring temperature is above 5° C., the stirring speed is 1500-3000 rpm, and the mixing time is 5 min-15 min.

[0023] The beneficial effects of adopting the above further technical solution are: the raw materials can be fully mixed and evenly mixed, and the later aging and drying time can be shortened.

[0024] Furthermore, the aging and drying time of the stuffing is 24-30 hours.

[0025] The beneficial effect of adopting the above further technical solution is as follows: using the water-based mud drill cuttings composite drying agent of the present invention can significantly shorten the aging and air-drying time of the stuffing, that is, shorten the drying time and improve work efficiency.

[0026] Beneficial effects of the present invention:

[0027] The MT-18 heavy metal capture agent added in the present invention can react rapidly with various heavy metal ions (mercury, lead, copper, nickel, manganese, zinc, chromium, etc.) in wastewater at room temperature to generate chelates that are insoluble in water and have good chemical stability, thereby achieving the purpose of capturing and removing heavy metals. The heavy metal capture agent is non-toxic, odorless, and will not cause secondary pollution.

[0028] The present invention hardens cement and simultaneously adds fly ash for adsorption and synergistic effect with polyvinyl alcohol fiber and carboxymethyl cellulose to efficiently adsorb, wrap pollutants, dehydrate and harden to form a dense concretion, thereby achieving an efficient solidification effect.

[0029] The present invention uses silicon dioxide as the flocculation core, adds bentonite to absorb organic compounds in water-based mud drill cuttings, and adds magnesium oxide to consolidate the solid phase and condensed precipitate in the water-based mud drill cuttings to wrap harmful substances therein.

[0030] The present invention adds polyferric sulfate and ferric chloride, and through a series of complex physical and chemical changes such as polymerization, nucleation and precipitation of trivalent iron hydrolysis products in the waste drilling fluid, harmful substances such as heavy metals in the waste drilling fluid are condensed and sealed. Polyferric sulfate and ferric chloride contain a large amount of cationic electrolytes, which can neutralize the negative charge on the surface of water-based drill cuttings, reduce the potential, strip the adsorbed water and part of the crystal water of the water-based mud drill cuttings into free water, and can also accelerate the solidification of cement and accelerate the drying of the water-based drill cuttings solidified material.

[0031] The present invention adds surfactants such as sodium dodecylnaphthalene sulfonate calcium formate and phthalic anhydride to increase the stability of the dry solidified material, further stabilize harmful substances in the waste drilling fluid, and is safer and more environmentally friendly. The present invention does not add calcium oxide, which is beneficial to reducing the calcium oxide content in the solidified water-based drill cuttings, thereby reducing the cracking rate of the water-based drill cuttings when making bricks.

[0032] In summary, the water-based mud drill cuttings composite desiccant obtained by compounding with specific raw materials and proportions can significantly shorten the curing time, reduce the amount of desiccant used, have excellent desiccant effect, and are suitable for wide application. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Example 1

[0035] The method for using the water-based mud cuttings composite desiccant comprises the following steps:

[0036] (1) Weigh:

[0037] Agent A: 180 g cement (ordinary Portland cement, grade PO 42.5), 20 g sodium silicate, 20 g sodium dodecylnaphthalene sulfonate, 50 g silicon dioxide (particle size 200-300 mesh), 80 g polyvinyl alcohol fiber (diameter 50-80 μm, length 1-5 μm), 50 g carboxymethyl cellulose, 50 g aluminum sulfate, 40 g polyferric sulfate;

[0038] Agent B: 80 grams of calcium formate, 80 grams of calcium oxide, 20 grams of magnesium oxide, 30 grams of ferric chloride, 120 grams of bentonite, 130 grams of fly ash (particle size is 200-300 mesh), 20 grams of phthalic anhydride, and 40 grams of MT-18 heavy metal scavenger.

[0039] (2) First add 50 grams of agent A and then add 100 grams of agent B to 3500 grams of water-based mud drill cuttings. Stir with a mixer at room temperature until the mud changes from a flowing fluid to a loose soil state. Then stop stirring. The stirring speed is 2000 rpm and the mixing time is 10 minutes. The material is aged and air-dried for 24 hours to complete drying.

[0040] Example 2

[0041] The method for using the water-based mud cuttings composite desiccant comprises the following steps:

[0042] (1) Weigh: 150 g of cement (ordinary Portland cement, grade PO 42.5), 10 g of sodium silicate, 10 g of sodium dodecylnaphthalene sulfonate, 30 g of silicon dioxide (particle size 200-300 mesh), 50 g of polyvinyl alcohol fiber (diameter 50-80 μm, length 1-5 μm), 30 g of carboxymethyl cellulose, 40 g of aluminum sulfate, and 30 g of polyferric sulfate;

[0043] Agent B: 50 grams of calcium formate, 50 grams of calcium oxide, 10 grams of magnesium oxide, 20 grams of ferric chloride, 100 grams of bentonite, 100 grams of fly ash (particle size is 200-300 mesh), 10 grams of phthalic anhydride, and 30 grams of MT-18 heavy metal scavenger.

[0044] (2) First add 80 grams of agent A and then add 150 grams of agent B to 3500 grams of water-based mud drill cuttings. Stir with a mixer at room temperature until the mud changes from a flowing fluid to a loose soil state. Then stop stirring. The stirring speed is 1500 rpm and the mixing time is 15 minutes. The material is aged and air-dried for 30 hours to complete drying.

[0045] Example 3

[0046] The method for using the water-based mud cuttings composite desiccant comprises the following steps:

[0047] () Weigh: 200 g cement (ordinary Portland cement, grade PO 42.5), 30 g sodium silicate, 30 g sodium dodecylnaphthalene sulfonate, 80 g silicon dioxide (particle size 200-300 mesh), 100 g polyvinyl alcohol fiber (diameter 50-80 μm, length 1-5 μm), 70 g carboxymethyl cellulose, 70 g aluminum sulfate, 50 g polyferric sulfate;

[0048] Agent B: 100 grams of calcium formate, 100 grams of calcium oxide, 30 grams of magnesium oxide, 40 grams of ferric chloride, 150 grams of bentonite, 150 grams of fly ash (particle size is 200-300 mesh), 30 grams of phthalic anhydride, and 50 grams of MT-18 heavy metal scavenger.

[0049] (2) First add 60 grams of agent A and then add 120 grams of agent B to 3500 grams of water-based mud drill cuttings. Use a mixer to stir at room temperature until the mud changes from a flowing fluid to a loose soil state. Then stop stirring. The stirring speed is 3000 rpm and the mixing time is 5 minutes. The material is aged and air-dried for 27 hours to complete drying.

[0050] After the dry solidification treatment, the solidified body was immersed in water and shaken for 24 hours (25°C). The solidified body was intact without cracks, and the leached water was clear. The properties of the leached water are shown in Table 1.

[0051] Table 1 Properties of water leached from dried solids of Examples 1-3

[0052]

[0053] Conclusion: The water-based mud drill cuttings composite desiccant obtained by compounding with specific raw materials and proportions can significantly shorten the curing time, reduce the amount of desiccant used, have excellent desiccant effect, and are suitable for wide application.

[0054] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one 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 present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A water-based mud drilling cuttings composite desiccant, characterized in that: Including the following raw materials by weight: Agent A: 15-20 parts of cement, 1-3 parts of sodium silicate, 1-3 parts of sodium dodecylnaphthalene sulfonate, 3-8 parts of silicon dioxide, 5-10 parts of polyvinyl alcohol fiber, 3-7 parts of carboxymethyl cellulose, 4-7 parts of aluminum sulfate, 3-5 parts of polyferric sulfate; Agent B: 5-10 parts of calcium formate, 5-10 parts of calcium oxide, 1-3 parts of magnesium oxide, 2-4 parts of ferric chloride, 10-15 parts of bentonite, 10-15 parts of fly ash, 1-3 parts of phthalic anhydride, and 3-5 parts of MT-18 heavy metal scavenger.

2. A water-based mud drilling cuttings composite desiccant according to claim 1, characterized in that: Including the following raw materials by weight: Agent A: 18 parts of cement, 2 parts of sodium silicate, 2 parts of sodium dodecylnaphthalene sulfonate, 5 parts of silicon dioxide, 8 parts of polyvinyl alcohol fiber, 5 parts of carboxymethyl cellulose, 5 parts of aluminum sulfate, 4 parts of polyferric sulfate; Agent B: 8 parts of calcium formate, 8 parts of calcium oxide, 2 parts of magnesium oxide, 3 parts of ferric chloride, 12 parts of bentonite, 13 parts of fly ash, 2 parts of phthalic anhydride, and 4 parts of MT-18 heavy metal scavenger.

3. A water-based mud drilling cuttings composite desiccant according to claim 1, characterized in that: The particle size of the silicon dioxide is 200-300 meshes, and the particle size of the fly ash is 200-300 meshes.

4. A water-based mud drilling cuttings composite desiccant according to claim 1, characterized in that: The polyvinyl alcohol fiber has a diameter of 50-80 μm and a length of 1-5 μm.

5. A method for using a water-based mud cuttings composite desiccant, characterized in that: The following steps are involved: (1) Weighing the raw materials according to the water-based mud drilling cuttings composite desiccant according to any one of claims 1 to 4; (2) First add agent A and then agent B to the water-based mud cuttings, and stir them with a mixer until the mud changes from a flowing fluid to a loose soil state. Then stop stirring, let the material age and dry it in the sun to complete the drying.

6. The method for using a water-based mud drilling cuttings composite desiccant according to claim 5, characterized in that: The mass ratio of the water-based mud cuttings, agent A and agent B is (320-380):(5-8):(10-15).

7. The method for using a water-based mud drilling cuttings composite desiccant according to claim 5, characterized in that: The stirring temperature is above 5°C, the stirring speed is 1500-3000 rpm, and the mixing time is 5min-15min.

8. The method for using a water-based mud drilling cuttings composite desiccant according to claim 5, characterized in that: The aging and drying time of the stuffed material is 24-30 hours.

Images