A kind of rock wool based on drill cuttings, its preparation method and application

Abstract

The present invention provides a rock wool based on drill cuttings, a preparation method thereof and an application thereof; the preparation raw materials include: drill cuttings subjected to dewatering treatment and modification treatment, a binder and a water repellent; the drill cuttings are water-based drilling fluid drill cuttings and / or oil-based drilling fluid drill cuttings from deep formations more than 3000 meters, the binder is acrylic resin, and the water repellent is silicone; the dewatered and modified drill cuttings are melted to obtain a melt; the melt is drawn into a fiber shape, and the binder and the water repellent are sprayed during the fiber forming process to obtain a primary rock wool felt; then the primary rock wool felts are stacked layer by layer and pressed to cure to obtain a finished rock wool product. The rock wool prepared by the present invention has strong heat insulation and good waterproof performance, and can be used for preparing rock wool boards; moreover, the problem of treating waste drill cuttings is solved, which has good environmental protection significance.

Description

Technical Field

[0001] The present invention relates to the technical field of rock wool preparation, and particularly relates to a drill cuttings-based rock wool, a preparation method thereof, and an application thereof. Background Art

[0002] Rock wool originated in Hawaii. After the first volcanic eruption on the Hawaiian Islands, the residents on the island found strands of soft, melted rock on the ground, which was the initially recognized rock wool fiber by humans. The production process of rock wool actually simulates this natural process of volcanic eruption in Hawaii. Rock wool products all use high-quality basalt, dolomite, etc. as the main raw materials. After being melted at a temperature above 1450°C, they are centrifuged into fibers at high speed by an internationally advanced four-axis centrifuge. At the same time, a certain amount of binder, dust-proof oil, and water-repellent agent are sprayed in, and then collected by a cotton collecting machine. Through the pendulum method process, after three-dimensional cotton laying, they are solidified and cut to form rock wool products of different specifications and uses.

[0003] In the prior art, basalt and dolomite are usually used as raw materials, supplemented with materials such as shale, slag, and coke. Rock wool fibers are generated by centrifugation at high temperature, and then rock wool products are formed. For example, in Chinese Patent Application CN 111331995 A, basalt, dolomite, slag, and coke are mixed, and the mixture of basalt, dolomite, slag, and coke is fed into a preheated melting furnace, and the mixture is melted into a melt to be formed into fibers, and then formaldehyde-free rock wool is produced. For example, in Chinese Patent CN 104445908 B, the raw materials of the rock wool material include 70 - 80 parts by weight of basalt, 5 - 8 parts of limestone, 8 - 10 parts of slag, 20 - 30 parts of coke, and 3 - 5 parts of auxiliary materials. This ratio is easy to melt, has good fiber-forming effect, and the fiber distribution is uniform. The auxiliary materials are selected from fluorite, diatomite, or shale to further improve the melting effect.

[0004] The drill cuttings in oil drilling, especially those in deep formations, are actually debris of formation rocks, which are formed after being broken by the drill bit and drilling fluid during the drilling process. Their main components are sandstone, limestone, mudstone, shale, etc., and there are also basalt and dolomite. Moreover, drill cuttings are usually drilling waste, which are discharged or used for other purposes, such as paving, after being treated. Therefore, using drill cuttings as raw materials and producing rock wool through a certain process can find a suitable way for the treatment of drill cuttings, which is of great significance. However, drill cuttings are usually adhered and wrapped by drilling fluid during the drilling process and adhere to some small particulate solids, which will have a certain impact on the production process when producing rock wool. Summary of the Invention

[0005] In order to solve the above problems in the prior art, the present invention provides a drill cuttings-based rock wool, a preparation method thereof, and an application thereof.

[0006] In a first aspect, the present invention provides a rock wool based on drill cuttings, and the preparation raw materials include: drill cuttings subjected to dewatering treatment and modification treatment, a binder, and a water repellent;

[0007] The drill cuttings are water-based drilling fluid cuttings and / or oil-based drilling fluid cuttings; preferably, the drill cuttings are cuttings from deep formations more than 3000 meters; the dosage of the drill cuttings is 80-96 wt% of the total amount of the preparation raw materials;

[0008] The binder is acrylic resin, and the addition amount of the binder is 1-5 wt% of the total amount of the preparation raw materials;

[0009] The water repellent is silicone, and the addition amount of the water repellent is 1-3 wt% of the total amount of the preparation raw materials.

[0010] As a specific embodiment of the present invention, whether the drill cuttings are water-based drilling fluid cuttings or oil-based drilling fluid cuttings, their main components include limestone, sandstone, mudstone or shale.

[0011] As a specific embodiment of the present invention, the dewatering treatment is centrifugal dewatering treatment. The drill cuttings can remove the adhered drilling fluid and solid particles through centrifugal dewatering. After dewatering, the content of drilling fluid and moisture in the drill cuttings is greatly reduced, and the water content of the drill cuttings ≤ 10%, which is beneficial to the next melting and the operation of the rock wool preparation process.

[0012] As a specific embodiment of the present invention, the modification treatment includes: adding a modifier and a fibrous mineral to the drill cuttings after the dewatering treatment, and performing pre-sintering treatment after mixing.

[0013] As a specific embodiment of the present invention, the modifier is at least one of sodium dodecylbenzenesulfonate, OP-10, soy lecithin, polyethylene glycol, Tween-20, and silane coupling agent KH550; the addition amount of the modifier is 1-3 wt% of the total amount of the preparation raw materials. The role of the modifier is to change the wettability of the rock wool, make the rock wool have good hydrophobicity, and have better water resistance after forming the product.

[0014] As a specific embodiment of the present invention, the fibrous mineral is at least one of sepiolite, diatomite, and attapulgite; the addition amount of the fibrous mineral is 1-9 wt% of the total amount of the preparation raw materials. Adding the fibrous mineral during the pre-sintering treatment can further improve the fiber-forming effect and the fiber distribution is uniform.

[0015] As a specific embodiment of the present invention, the pre-sintering treatment temperature is 200°C to 650°C, and the pre-sintering treatment time is 1 to 6 h. The pre-sintering enables the modifier and the fibrous mineral to better combine with the drill cuttings.

[0016] As a specific embodiment of the present invention, after the cuttings are subjected to dewatering treatment, they are basically free of drilling fluid and moisture, which is beneficial to the next step of melting. At the same time, the cuttings are subjected to modification treatment, and the surface contains surfactants, having good hydrophobicity, and the water resistance of the formed product is better. Moreover, through high-temperature roasting, the oil attached to the oil-based cuttings is thermally desorbed, and the cleanliness of the cuttings is further improved, which is beneficial to the quality of the finished product; when roasting, fiber minerals are added, which can further improve the fiber-forming effect and the fiber distribution is uniform. The rock wool prepared by the present invention has strong heat insulation and good water resistance, and can be used for preparing rock wool boards.

[0017] In a second aspect, the present invention provides a method for preparing the rock wool as described above, comprising the following steps:

[0018] S1: Melting the dewatered and modified cuttings to obtain a melt;

[0019] S2: Drawing the melt obtained in step S1 into a fiber shape, and spraying a binder and a water-repellent agent during the fiber forming process to obtain a primary rock wool felt;

[0020] S3: Stacking and pressing the primary rock wool felt obtained in step S2 layer by layer to cure and obtain a finished rock wool product.

[0021] As a specific embodiment of the present invention, in step S1, the dewatered and modified cuttings are water-based drilling fluid cuttings and / or oil-based drilling fluid cuttings; preferably, the cuttings are deep formation cuttings more than 3000 meters; its main components include limestone, sandstone, mudstone or shale; the dosage of the cuttings is 80-96 wt% of the total amount of the preparation raw materials.

[0022] The dewatering treatment includes centrifugally dewatering the cuttings in a drilling fluid centrifuge and then performing pressure filtration treatment using a filter press, and the water content of the treated cuttings ≤ 10%; preferably, the centrifugal speed is 1000-2500 prm;

[0023] Specifically, after the cuttings are centrifugally dewatered by a drilling fluid centrifuge to remove the adhered drilling fluid and small particle solids, a filter press is used to further remove the adhered drilling fluid.

[0024] The modification treatment includes: adding a modifier and fiber minerals to the dewatered cuttings, mixing and then performing pre-sintering treatment;

[0025] The modifier is at least one of sodium dodecylbenzenesulfonate, OP-10, soy lecithin, polyethylene glycol, Tween-20 and silane coupling agent; the addition amount of the modifier is 1-3 wt% of the total amount of the preparation raw materials.

[0026] The fibrous mineral is one or more of sepiolite, diatomite, and attapulgite; the addition amount of the fibrous mineral is 1-9 wt% of the total amount of the preparation raw materials.

[0027] The temperature of the pre-sintering treatment is 200°C to 650°C, and the time of the pre-sintering treatment is 1-6 h.

[0028] As a specific embodiment of the present invention, in the step S1, the melting temperature is 1450°C to 1600°C.

[0029] As a specific embodiment of the present invention, in the step S2, the binder is acrylic resin, and the addition amount of the binder is 1-5 wt% of the total amount of the preparation raw materials; the water repellent is silicone, and the addition amount of the water repellent is 1-3 wt% of the total amount of the preparation raw materials.

[0030] As a specific embodiment of the present invention, in the step S3, the pressing includes pressing by a pressure roller and a pleating machine.

[0031] The above raw materials in the present invention can be self-made or obtained by commercial purchase, and the present invention does not make special limitations on this.

[0032] In the third aspect, the present invention provides the application of the rock wool in the fields of construction, road construction, and fireproof materials

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0034] 1. For the rock wool of the present invention, after the drill cuttings are subjected to dewatering treatment, they basically do not contain drilling fluid and moisture, which is beneficial to the next step of melting. At the same time, the drill cuttings are subjected to modification treatment, and the surface contains surfactants, having good hydrophobicity, and the water resistance of the formed product is better. Moreover, through high-temperature roasting, the oil attached to the oil-based drill cuttings is thermally desorbed, and the cleanliness of the drill cuttings is further improved, which is beneficial to the quality of the finished product; when roasting, fibrous minerals are added, which can further improve the fiber-forming effect and the fibers are evenly distributed. The rock wool prepared by the present invention has strong heat insulation and good water resistance, and can be used to prepare rock wool boards.

[0035] 2. The rock wool prepared by the present invention has strong heat insulation and good water resistance. Before and after high-temperature melting, surfactants and water repellents are respectively added, so that the water resistance of the rock wool is increased by 3%.

[0036] 3. The rock wool prepared by the method of the present invention can be used to prepare products such as rock wool boards, and solves the problem of the treatment of waste drill cuttings, having good environmental protection significance. Specific Embodiments

[0037] The present invention will be further described below in conjunction with specific embodiments, but it does not constitute any limitation to the present invention.

[0038] In each embodiment of the present invention, the specific information of the reagents used is as follows:

[0039] Modifier: Sodium dodecylbenzenesulfonate, Brand: Aladdin, Molecular weight: 348.48, Manufacturer: Shanghai Aladdin Biochemical Technology Co., Ltd.

[0040] OP-10, brand: Aladdin, manufacturer: Shanghai Aladdin Biochemical Technology Co., Ltd.;

[0041] Soy lecithin, brand: Aladdin, molecular weight: 758.06, manufacturer: Shanghai Aladdin Biochemical Technology Co., Ltd.

[0042] Polyethylene glycol, brand: Aladdin, molecular weight: 44.05, manufacturer: Shanghai Aladdin Biochemical Technology Co., Ltd.;

[0043] Tween-20, brand: Aladdin, manufacturer: Shanghai Aladdin Biochemical Technology Co., Ltd.

[0044] Silane coupling agent KH550, manufacturer: Shanghai Zhehua Chemical Materials Co., Ltd.

[0045] Sepiolite, manufacturer: Hebei Lingshou County Baorun Mineral Products Co., Ltd.

[0046] Diatomaceous earth, manufacturer: Guangdong Senda Diatomaceous Earth Materials Co., Ltd.

[0047] Attapulgite, manufacturer: Hebei Lingshou County Baorun Mineral Products Co., Ltd.

[0048] Binder: acrylic resin, manufacturer: Shandong Weifang Ruiguang Chemical Co., Ltd.

[0049] Water repellent: silicone water repellent, manufacturer: Beijing Zhongjinkai Technology Co., Ltd.

[0050] In each embodiment of the present invention, the specific information of the equipment used is as follows:

[0051] Drilling fluid centrifuge, manufacturer: Siji Petroleum Machinery Co., Ltd.

[0052] Melting furnace, manufacturer: Xi'an Gaole Mechanical and Electrical Equipment Co., Ltd.;

[0053] Cotton collecting machine, manufacturer: Jiangsu Litekai Machinery Co., Ltd.

[0054] In each embodiment of the present invention, the specific information of the testing method used is as follows:

[0055] Thermal conductivity was measured using a high-precision thermal conductivity meter from Xi'an Xiaxi Electronic Technology Co., Ltd.

[0056] Hydrophobicity rate. The measurement method is specified in GB-T 10299 "Test Method for Hydrophobicity of Thermal Insulation Materials".

[0057] Volume water absorption rate. The measurement method is specified in GB-T 16401-1996 "Test Method for Water Absorbency of Mineral Wool Products".

[0058] Example 1

[0059] This example provides a kind of rock wool based on drill cuttings and its preparation method. The specific details are as follows:

[0060] A kind of rock wool based on drill cuttings, the preparation raw materials include: drill cuttings, modifier, binder, water repellent and fibrous mineral, and the mass percentages are 91%, 1.5%, 3%, 1%, 3.5% respectively.

[0061] The steps of the preparation method are as follows:

[0062] S1: Drill cuttings dewatering: After mixing the water-based drilling fluid drill cuttings with a well depth of 3000 m to 4500 m evenly, remove the adhered drilling fluid and small particle solids through a drilling fluid centrifuge for dewatering, and then use a filter press to further remove the attached drilling fluid;

[0063] Modification treatment: Add the modifier OP-10 to the dewatered drill cuttings, mix evenly, and then add the fibrous mineral sepiolite for pre-sintering treatment. The pre-sintering treatment temperature is 450 °C and the pre-sintering treatment time is 5 h;

[0064] S2: Add the drill cuttings treated in step S1 into a melting furnace and melt them into a melt. The temperature of the melting furnace is 1500 °C;

[0065] S3: Under the high-speed centrifugal action of a four-roll centrifuge, draw the melt obtained in step S2 into a fiber shape, and spray the binder acrylic resin and the water repellent silicone during the fiber forming process, and at the same time apply blowing air to send it to a collecting machine; form a primary rock wool felt through the collecting machine;

[0066] S4: Lay the primary rock wool felt obtained in step S3 layer by layer, press it with a pressing roller and a pleating machine, and then cure it in a curing furnace to obtain the finished rock wool product.

[0067] The rock wool obtained in Example 1 was tested, and its thermal conductivity was 0.040 W / (m·K); the hydrophobicity rate was 98.0%; the volume water absorption rate was 3.26%.

[0068] Example 2

[0069] This example provides a kind of rock wool based on drill cuttings and its preparation method. The specific details are as follows:

[0070] A kind of rock wool based on drill cuttings, the preparation raw materials include: drill cuttings, modifier, binder, water repellent and fiber mineral, and the mass percentages are 80%, 3%, 5%, 3% and 9% respectively.

[0071] The preparation method steps are as follows:

[0072] S1: Drill cuttings dewatering: After mixing the water-based drilling fluid drill cuttings with a well depth of more than 4000 meters evenly, dewater and remove the adhering drilling fluid and small particle solids through a drilling fluid centrifuge, and then use a filter press to further remove the adhering drilling fluid;

[0073] Modification treatment; Add the modifier silane coupling agent to the dewatered drill cuttings, mix evenly, and then add the fiber mineral attapulgite and mix for pre-sintering treatment. The pre-sintering treatment temperature is 350 °C, and the pre-sintering treatment time is 6 h;

[0074] S2: Add the drill cuttings treated in step S1 into a melting furnace and melt them into a melt. The temperature of the melting furnace is 1550 °C;

[0075] S3: Under the high-speed centrifugal action of a four-roll centrifuge, draw the melt obtained in step S2 into a fiber shape, and spray the binder acrylic resin and the water repellent silicone during the fiber forming process, and at the same time apply blowing air to send it to a cotton collecting machine; Form a primary rock wool felt through the cotton collecting machine;

[0076] S4: Layer by layer stack the primary rock wool felt obtained in step S3, then press it by a pressing roller and a pleating machine, and then cure it in a curing furnace to obtain the finished rock wool.

[0077] The rock wool obtained in Example 2 was tested, and its thermal conductivity was 0.040 W / (m·K); the water repellency was 97.5%; the volume water absorption rate was 3.79%.

[0078] Example 3

[0079] This example provides a kind of rock wool based on drill cuttings and its preparation method. The specific details are as follows:

[0080] A kind of rock wool based on drill cuttings, the preparation raw materials include: drill cuttings, modifier, binder, water repellent and fiber mineral, and the mass percentages are 92%, 1%, 1%, 1% and 5% respectively.

[0081] The preparation method steps are as follows:

[0082] S1: Drill cuttings dewatering: After mixing the oil-based drilling fluid drill cuttings with a well depth of 3000 meters to more than 4000 meters evenly, dewater and remove the adhering drilling fluid and small particle solids through a drilling fluid centrifuge, and then use a filter press to further remove the adhering drilling fluid;

[0083] Modification treatment: After the centrifugal separation treatment of the drill cuttings, sodium dodecylbenzenesulfonate as a modifier is added, and after being mixed evenly, fibrous mineral sepiolite is added and mixed for pre-sintering treatment. The pre-sintering treatment temperature is 650 °C, and the pre-sintering treatment time is 6 h;

[0084] S2: Add the drill cuttings treated in step S1 into a melting furnace to melt into a melt, and the temperature of the melting furnace is 1580 °C;

[0085] S3: Through the high-speed centrifugal action of a four-roll centrifuge, the melt obtained in step S2 is drawn into a fiber shape, and during the fiber forming process, binder acrylic resin and water-repellent agent silicone are sprayed, and at the same time, blowing air is applied and sent to a cotton collecting machine; Rock wool primary felt is formed by the cotton collecting machine;

[0086] S4: Layer by layer stack the rock wool primary felt obtained in step S3, then press it with a pressure roller and a pleating machine, and then cure it in a curing furnace to obtain the finished rock wool product.

[0087] The rock wool obtained in Example 3 is tested, and its thermal conductivity is 0.040 W / (m·K); the water-repellent rate is 98%; the volume water absorption rate is 3.35%.

[0088] Example 4

[0089] This example provides a kind of rock wool based on drill cuttings and its preparation method, and the specific details are as follows:

[0090] A kind of rock wool based on drill cuttings, the preparation raw materials include: drill cuttings, modifier, binder, water-repellent agent and fibrous mineral, and the mass percentages are 90%, 1%, 3%, 1%, 5% respectively.

[0091] The preparation method steps are as follows:

[0092] S1: Drill cuttings centrifugal separation: After mixing the oil-based drilling fluid drill cuttings with a well depth of 3000 m to more than 4000 m evenly, remove the adhered drilling fluid and small particle solids through a drilling fluid centrifuge, and then use a filter press to further remove the adhered drilling fluid;

[0093] Modification treatment: After the centrifugal separation treatment of the drill cuttings, sodium dodecylbenzenesulfonate as a modifier is added, and after being mixed evenly, fibrous mineral sepiolite is added and mixed for pre-sintering treatment. The pre-sintering treatment temperature is 550 °C, and the pre-sintering treatment time is 4 h;

[0094] S2: Add the drill cuttings treated in step S1 into a melting furnace to melt into a melt, and the temperature of the melting furnace is 1500 °C;

[0095] S3: Through the high-speed centrifugal action of a four-roll centrifuge, the melt obtained in step S2 is drawn into a fibrous shape, and during the fiber forming process, a binder acrylic resin and a water-repellent agent silicone are sprayed in, while a blowing-off air is applied and sent to a cotton collecting machine; a primary rock wool felt is formed through the cotton collecting machine;

[0096] S4: The primary rock wool felt obtained in step S3 is laid layer by layer, then pressed by a pressing roller and a pleating machine, and further cured in a curing furnace to obtain a finished rock wool product.

[0097] The rock wool obtained in Example 4 was tested, and its thermal conductivity was 0.040 W / (m·K); the water-repellent rate was 97%; the volume water absorption rate was 3.52%.

[0098] Example 5

[0099] This example provides a drill cuttings-based rock wool and its preparation method, and the specific details are as follows:

[0100] A drill cuttings-based rock wool, the preparation raw materials include: drill cuttings, a modifier, a binder, a water-repellent agent, and a fibrous mineral, with mass percentages of 89%, 1%, 4%, 2%, and 4% respectively.

[0101] The preparation method steps are as follows:

[0102] S1: Drill cuttings dewatering: After mixing the water-based drilling fluid drill cuttings with a well depth of 3000 m to over 4000 m evenly, they are dewatered by a drilling fluid centrifuge to remove the adhered drilling fluid and small particle solids, and then a filter press is used to further remove the adhered drilling fluid;

[0103] Modification treatment; After the dewatered drill cuttings are added with a modifier sodium dodecylbenzenesulfonate and mixed evenly, fibrous mineral sepiolite is added and mixed for pre-sintering treatment. The pre-sintering treatment temperature is 500 °C, and the pre-sintering treatment time is 5 h;

[0104] S2: Add the drill cuttings treated in step S1 into a melting furnace and melt them into a melt. The temperature of the melting furnace is 1550 °C;

[0105] S3: Through the high-speed centrifugal action of a four-roll centrifuge, the melt obtained in step S2 is drawn into a fibrous shape, and during the fiber forming process, a binder acrylic resin and a water-repellent agent silicone are sprayed in, while a blowing-off air is applied and sent to a cotton collecting machine; a primary rock wool felt is formed through the cotton collecting machine;

[0106] S4: The primary rock wool felt obtained in step S3 is laid layer by layer, then pressed by a pressing roller and a pleating machine, and further cured in a curing furnace to obtain a finished rock wool product.

[0107] The rock wool obtained in Example 5 was tested, and its thermal conductivity was 0.040 W / (m·K); the water-repellent rate was 98%; the volume water absorption rate was 3.39%.

[0108] Example 6

[0109] This example provides a kind of rock wool based on drill cuttings and its preparation method. The specific details are as follows:

[0110] A kind of rock wool based on drill cuttings, the preparation raw materials include: drill cuttings, modifier, binder, water repellent and fiber mineral, and the mass percentages are 92%, 2%, 1%, 1%, 4% respectively.

[0111] The preparation method steps are as follows:

[0112] S1: Drill cuttings dewatering: After mixing the water-based drilling fluid drill cuttings with a well depth of more than 3500m to 4500m evenly, remove the adhered drilling fluid and small particle solids through a drilling fluid centrifuge for dewatering, and then use a filter press to further remove the attached drilling fluid;

[0113] Modification treatment; Add modifier OP-10 to the dewatered drill cuttings, mix evenly, and then add fiber mineral sepiolite for pre-sintering treatment. The pre-sintering treatment temperature is 600°C and the pre-sintering treatment time is 6h;

[0114] S2: Add the drill cuttings treated in step S1 into a melting furnace to melt into a melt, and the temperature of the melting furnace is 1550°C;

[0115] S3: Under the high-speed centrifugal action of a four-roll centrifuge, draw the melt obtained in step S2 into a fiber shape, and spray binder acrylic resin and water repellent silicone during the fiber forming process, and at the same time apply blowing air to send it to a cotton collecting machine; Form a primary rock wool felt through the cotton collecting machine;

[0116] S4: Lay the primary rock wool felt obtained in step S3 layer by layer, then press it by a pressing roller and a pleating machine, and then cure it in a curing furnace to obtain the finished rock wool.

[0117] The rock wool obtained in Example 6 is tested, and its thermal conductivity is 0.041W / (m·K); the water repellency rate is 98%; the volume water absorption rate is 3.67%.

[0118] Example 7

[0119] This example provides a kind of rock wool based on drill cuttings and its preparation method. The specific details are as follows:

[0120] A kind of rock wool based on drill cuttings, the preparation raw materials include: drill cuttings, modifier, binder, water repellent and fiber mineral, and the mass percentages are 90%, 1%, 2%, 1%, 6% respectively.

[0121] The preparation method steps are as follows:

[0122] S1: Drill cuttings dewatering: After uniformly mixing the water-based drilling fluid cuttings from a well depth of 3,500 m to over 4,500 m, remove the adhering drilling fluid and small particulate solids through dewatering by a drilling fluid centrifuge, and then use a filter press to further remove the adhering drilling fluid;

[0123] Modification treatment; Add the surfactant Tween-20 to the dewatered cuttings, mix uniformly, and then add fibrous mineral diatomaceous earth and mix for pre-sintering treatment. The pre-sintering treatment temperature is 650 °C, and the pre-sintering treatment time is 6 h;

[0124] S2: Add the cuttings treated in step S1 into a melting furnace and melt them into a melt. The temperature of the melting furnace is 1,550 °C;

[0125] S3: Under the high-speed centrifugal action of a four-roll centrifuge, draw the melt obtained in step S2 into a fibrous shape, and spray the binder acrylic resin and the water-repellent agent silicone during the fiber forming process, and at the same time apply a blowing-off air to send it to a cotton collecting machine; Form a primary rock wool felt through the cotton collecting machine;

[0126] S4: Lay the primary rock wool felt obtained in step S3 layer by layer, then press it with a pressing roller and a pleating machine, and then cure it in a curing furnace to obtain a finished rock wool product.

[0127] The rock wool obtained in Example 7 was tested, and its thermal conductivity was 0.041 W / (m·K); the water-repellent rate was 98%; the volume water absorption rate was 3.89%.

[0128] Example 8

[0129] This example provides a drill cuttings-based rock wool and its preparation method, and the specific details are as follows:

[0130] A drill cuttings-based rock wool, the preparation raw materials include: drill cuttings, modifier, binder, water-repellent agent and fibrous mineral, with mass percentages of 92%, 1%, 5%, 1%, and 1% respectively.

[0131] The preparation method steps are as follows:

[0132] S1: Drill cuttings dewatering: After uniformly mixing the water-based drilling fluid cuttings from a well depth of 3,000 m to over 4,000 m, remove the adhering drilling fluid and small particulate solids through dewatering by a drilling fluid centrifuge, and then use a filter press to further remove the adhering drilling fluid;

[0133] Modification treatment; Add the silane coupling agent as the modifier to the dewatered cuttings, mix uniformly, and then add fibrous mineral diatomaceous earth and mix for pre-sintering treatment. The pre-sintering treatment temperature is 650 °C, and the pre-sintering treatment time is 6 h;

[0134] S2: Add the cuttings treated in step S1 into a melting furnace and melt them into a melt. The temperature of the melting furnace is 1,550 °C;

[0135] S3: Through the high-speed centrifugal action of a four-roll centrifuge, the melt obtained in step S2 is drawn into a fiber shape, and during the fiber forming process, a binder acrylic resin and a water-repellent agent silicone are sprayed, and at the same time, a blowing-off air is applied and sent to a cotton collecting machine; a primary rock wool felt is formed through the cotton collecting machine.

[0136] S4: The primary rock wool felt obtained in step S3 is laid layer by layer, then pressed by a pressing roller and a pleating machine, and then cured in a curing furnace to obtain a finished rock wool product.

[0137] The rock wool obtained in Example 8 was tested, and its thermal conductivity was 0.040 W / (m·K); the water-repellent rate was 97%; the volume water absorption rate was 4.15%.

[0138] Example 9

[0139] This example provides a rock wool based on drill cuttings and its preparation method. The specific details are as follows:

[0140] A rock wool based on drill cuttings, the preparation raw materials include: drill cuttings, a modifier, a binder, a water-repellent agent, and a fibrous mineral, with mass percentages of 87%, 1%, 2%, 1%, and 9% respectively.

[0141] The preparation method steps are as follows:

[0142] S1: Drill cuttings dewatering: After mixing the water-based drilling fluid drill cuttings with a well depth of 3000 m to over 4000 m evenly, they are dewatered by a drilling fluid centrifuge to remove the adhered drilling fluid and small particle solids, and then a filter press is used to further remove the adhered drilling fluid.

[0143] Modification treatment; After the dewatered drill cuttings are added with a modifier sodium dodecylbenzenesulfonate and mixed evenly, fibrous mineral diatomaceous earth is added and mixed for pre-sintering treatment. The pre-sintering treatment temperature is 55 °C, and the pre-sintering treatment time is 5 h.

[0144] S2: The drill cuttings treated in step S1 are added into a melting furnace and melted into a melt. The temperature of the melting furnace is 1600 °C.

[0145] S3: Through the high-speed centrifugal action of a four-roll centrifuge, the melt obtained in step S2 is drawn into a fiber shape, and during the fiber forming process, a binder acrylic resin and a water-repellent agent silicone are sprayed, and at the same time, a blowing-off air is applied and sent to a cotton collecting machine; a primary rock wool felt is formed through the cotton collecting machine.

[0146] S4: The primary rock wool felt obtained in step S3 is laid layer by layer, then pressed by a pressing roller and a pleating machine, and then cured in a curing furnace to obtain a finished rock wool product.

[0147] The rock wool obtained in Example 9 was tested, and its thermal conductivity was 0.040 W / (m·K); the water-repellent rate was 97.2%; and the volume water absorption rate was 3.85%.

[0148] Comparative Example 1

[0149] In this comparative example, the drill cuttings at a well depth of 1000 m were used to prepare rock wool, and the specific details are as follows:

[0150] A kind of rock wool based on drill cuttings, the preparation raw materials include: drill cuttings, binder and water-repellent agent, and the mass percentages are 96%, 3%, and 1% respectively.

[0151] The preparation method steps are as follows:

[0152] S1: The drill cuttings at a well depth of 1000 m were directly added into the melting furnace and melted into a melt, and the temperature of the melting furnace was 1500 °C;

[0153] S2: The melt obtained in step S1 was drawn into a fiber shape by the high-speed centrifugal action of a four-roll centrifuge, and the binder acrylic resin and the water-repellent agent silicone were sprayed during the fiber forming process, and at the same time, a blowing-off wind was applied and sent to the cotton collecting machine; a primary rock wool felt was formed through the cotton collecting machine;

[0154] S3: The primary rock wool felt obtained in step S2 was laid layer by layer, then pressed by a pressure roller and a pleating machine, and then cured in a curing furnace to obtain the finished rock wool.

[0155] The rock wool obtained in Comparative Example 1 was soft and not formed.

[0156] Comparative Example 2

[0157] A method for preparing rock wool using drill cuttings, which includes the following steps:

[0158] A kind of rock wool based on drill cuttings, the preparation raw materials include: drill cuttings, binder and water-repellent agent, and the mass percentages are 96%, 3%, and 1% respectively.

[0159] The preparation method steps are as follows:

[0160] S1: The drill cuttings at a well depth of 3000 m to 4000 m were directly added into the melting furnace and melted into a melt, and the temperature of the melting furnace was 1500 °C;

[0161] S2: The melt obtained in step S1 was drawn into a fiber shape by the high-speed centrifugal action of a four-roll centrifuge, and the binder acrylic resin and the water-repellent agent silicone were sprayed during the fiber forming process, and at the same time, a blowing-off wind was applied and sent to the cotton collecting machine; a primary rock wool felt was formed through the cotton collecting machine;

[0162] S3: The primary rock wool felt obtained in step S2 was laid layer by layer, then pressed by a pressure roller and a pleating machine, and then cured in a curing furnace to obtain the finished rock wool.

[0163] The rock wool obtained in Comparative Example 2 was tested, and its thermal conductivity was 0.040 W / (m·K); the hydrophobicity rate was 95.0%; the volume water absorption rate was 4.85%.

[0164] From the comparison of Examples 1-9, it can be seen that Example 1 is the optimal example.

[0165] From the comparison of Examples 1-9 and Comparative Examples 1-2, it can be seen that the modification treatment in the steps is relatively critical and has a great impact. The pre-sintering also provides good help for the performance of the next cotton formation. At the same time, the properties shown by the cuttings at different depths are different during the cotton formation process, which affects the product performance.

[0166] In summary, the rock wool prepared by the present invention has strong heat insulation and good waterproof performance. After the cuttings are subjected to dewatering treatment and modification treatment, the waterproof performance is further improved.

[0167] It should be noted that the above-described embodiments are only used to explain the present invention and do not constitute any limitation to the present invention. The present invention has been described by referring to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory words rather than limiting words. Modifications can be made to the present invention within the scope of the claims of the present invention, and the present invention can be revised without departing from the scope and spirit of the present invention. Although the present invention described therein relates to specific methods, materials and embodiments, it does not mean that the present invention is limited to the specific examples disclosed therein. On the contrary, the present invention can be extended to all other methods and applications with the same function.

[0168] It should be noted that the above-described embodiments are only used to explain the present invention and do not constitute any limitation to the present invention. The present invention has been described by referring to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory words rather than limiting words. Modifications can be made to the present invention within the scope of the claims of the present invention, and the present invention can be revised without departing from the scope and spirit of the present invention. Although the present invention described therein relates to specific methods, materials and embodiments, it does not mean that the present invention is limited to the specific examples disclosed therein. On the contrary, the present invention can be extended to all other methods and applications with the same function.

Claims

1. A rock wool based on drill cuttings, characterized in that, The preparation raw materials include: drill cuttings subjected to dewatering and modification treatment, a binder, and a water repellent; The drill cuttings are water-based drilling fluid drill cuttings and / or oil-based drilling fluid drill cuttings; the dosage of the drill cuttings is 80-96 wt% of the total amount of the preparation raw materials; The binder is an acrylic resin; the addition amount of the binder is 1-5 wt% of the total amount of the preparation raw materials; The water repellent is silicone; the addition amount of the water repellent is 1-3 wt% of the total amount of the preparation raw materials; The modification treatment includes: adding a modifier and a fibrous mineral to the drill cuttings after dewatering treatment, and performing pre-sintering treatment after mixing; The modifier is at least one of sodium dodecylbenzenesulfonate, OP-10, soy lecithin, polyethylene glycol, Tween-20, and silane coupling agent KH550; The addition amount of the modifier is 1-3 wt% of the total amount of the preparation raw materials; The addition amount of the fibrous mineral is 1-9 wt% of the total amount of the preparation raw materials.

2. The rock wool according to claim 1, characterized in that, The drill cuttings are deep formation drill cuttings at a depth of more than 3000 meters.

3. The rock wool according to claim 1, characterized in that, The dewatering treatment is centrifugal dewatering treatment.

4. The rock wool according to any one of claims 1 to 3, characterized in that, The fibrous mineral is at least one of sepiolite, diatomite, and attapulgite.

5. The rock wool according to any one of claims 1 to 3, characterized in that The pre-sintering treatment temperature is 200°C to 650°C, and the pre-sintering treatment time is 1 to 6 hours.

6. The preparation method of rock wool according to claim 1, characterized in that, It includes the following steps: S1: Melting the drill cuttings after dewatering and modification treatment to obtain a melt; S2: Pulling the melt obtained in step S1 into a fibrous shape, and spraying the binder and the water repellent during the fiber forming process to obtain a primary rock wool felt; S3: Laying the primary rock wool felt obtained in step S2 layer by layer and pressing to cure to obtain a finished rock wool product.

7. The preparation method according to claim 6, characterized in that, In step S1, the dewatering treatment includes centrifugally dewatering the drill cuttings in a drilling fluid centrifuge and then performing pressure filtration treatment with a filter press, and the moisture content of the treated drill cuttings ≤ 10%.

8. The preparation method according to claim 7, characterized in that, The centrifugal speed of the centrifugal dewatering treatment is 1000-2500 prm.

9. The preparation method according to claim 6, characterized in that, The fibrous mineral is one or more of sepiolite, diatomite, and attapulgite; and / or, the pre-sintering treatment temperature is 200°C to 650°C, and the pre-sintering treatment time is 1 to 6 hours; and / or, in step S1, the drill cuttings after dewatering and modification treatment are deep formation drill cuttings at a depth of more than 3000 meters.

10. The preparation method according to claim 6, characterized in that, In step S1, the melting temperature is 1450°C to 1600°C.

11. The preparation method according to claim 6, wherein, In step S2, the binder is an acrylic resin, and the addition amount of the binder is 1-5 wt% of the total amount of the preparation raw materials; and / or, the water repellent is silicone, and the addition amount of the water repellent is 1-3 wt% of the total amount of the preparation raw materials.

12. The preparation method according to any one of claims 6-11, characterized in that, In step S3, the pressing includes pressing by a pressure roller and a pleating machine.

13. Application of the rock wool according to any one of claims 1-5 or the rock wool prepared by the preparation method according to any one of claims 6-12 in the fields of construction, road construction, and fireproof materials.