Method and equipment for preparing low-density environment-friendly drilling fluid

Abstract

The invention relates to the field of drilling fluid manufacturing, and particularly discloses low-density environment-friendly drilling fluid manufacturing equipment which comprises a preparation cylinder, a stirring mechanism is arranged in the preparation cylinder and comprises a filter cylinder, a conveying pipe and a conveying spiral blade, the conveying spiral blade is rotationally arranged in the conveying pipe, and the upper end of the conveying pipe is fixedly connected with the lower end of the filter cylinder; the conveying pipe and the filter cartridge are arranged, the upper end of the filter cartridge is closed, a through groove penetrating through the peripheral wall of the filter cartridge is formed in the peripheral wall of the filter cartridge, the motor drives the center shaft to rotate, so that the conveying spiral blade rotates along with the center shaft, and drilling fluid raw materials in the preparation cartridge enter the conveying pipe, are conveyed upwards and are discharged into the preparation cartridge again through the tubular partition piece and the filter screen. By means of the circulation, uniform mixing of the drilling fluid raw materials is achieved, impurities in the raw materials are filtered through the filter screen, the finished product quality of the drilling fluid is improved, the impurities are collected in the collecting groove between the tubular partition piece and the inner wall of the filter cylinder, and follow-up unified treatment of the impurities is also facilitated.

Description

Technical Field

[0001] The invention relates to the field of drilling fluid production, in particular to low-density environmentally friendly drilling fluid production equipment. Background Art

[0002] Drilling fluid is a general term for various circulating fluids that meet the needs of drilling work with their multiple functions during the drilling process. Among them, low-density environmentally friendly drilling fluid refers to a drilling fluid system with low density, low viscosity and good permeability. It can reduce the invasion of drilling fluid into the formation and the impact on pore pressure, and at the same time has the characteristics of low pollution to the environment. Its representative products include water-based drilling fluid, oil-based drilling fluid, synthetic-based drilling fluid, etc. Among them, water-based drilling fluid is mainly prepared from fresh water, slurry bentonite, lignite and various treatment agents that have a dispersing effect on clay and drill cuttings. In the preparation process of water-based drilling fluid, these raw materials need to be fully mixed. If the purity of these raw materials is insufficient, they will inevitably carry some impurities, and these impurities will eventually affect the quality of the finished drilling fluid. Summary of the invention

[0003] The purpose of the present invention is to provide a low-density environmentally friendly drilling fluid production device to overcome the above-mentioned defects in the prior art.

[0004] According to the present invention, a low-density environmentally friendly drilling fluid production equipment includes a preparation cylinder, a stirring structure is arranged in the preparation cylinder, the stirring mechanism includes a filter cylinder, a feed pipe and a feed spiral blade, the feed spiral blade is rotatably arranged in the feed pipe, the upper end of the feed pipe is fixedly connected to the lower end of the filter cylinder, the feed pipe is arranged with the filter cylinder, the upper end of the filter cylinder is closed, a through groove penetrating the peripheral wall of the filter cylinder is opened, a filter screen is fixed in the through groove, a tubular baffle is fixed in the filter cylinder, a collecting groove is formed between the outer periphery of the tubular baffle and the inner wall of the filter cylinder, and the lower end of the collecting groove is closed.

[0005] The feed pipe is fixed to the inner wall of the preparation cylinder through a plurality of first connecting rods, a motor is fixed to the upper end surface of the filter cylinder, a spline sleeve is fixed to the lower end of the rotating shaft of the motor, a central shaft is arranged in the feed pipe, and the upper end of the central shaft is splined in the spline sleeve.

[0006] A shaft sleeve is rotatably connected to the central shaft, and the shaft sleeve is fixed to the inner wall of the upper end of the material conveying pipe through a plurality of second connecting rods.

[0007] The lower end of the filter cartridge is fixedly connected to the upper end of the feed pipe by bolts, a circle of fixing plates is fixedly provided on the outer periphery of the lower end of the tubular baffle, an annular groove is opened in the lower end surface of the filter cartridge, the fixing plate is embedded in the annular groove, the filter cartridge and the feed pipe clamp the fixing plate and fix it between the filter cartridge and the feed pipe.

[0008] A discharge pipe connected to the preparation cylinder is fixed on the lower side of the preparation cylinder, a sealing plug is embedded in the discharge pipe, a plurality of brackets evenly distributed circumferentially with the discharge pipe as the center are fixed on the lower side of the preparation cylinder, a cover plate for sealing the upper opening of the preparation cylinder is provided at the upper end of the preparation cylinder, a circular hole is opened in the cover plate and penetrates through the thickness thereof, and the circular hole is penetrated at the upper end of the filter cylinder.

[0009] The beneficial effect of the present invention is that the motor drives the central shaft to rotate, so that the feeding spiral blade rotates accordingly, and the drilling fluid raw materials in the preparation cylinder enters the feeding pipe and is transported upward, and is re-discharged into the preparation cylinder through the tubular baffle and the filter screen. This cycle achieves uniform mixing of the drilling fluid raw materials, and the setting of the filter screen filters impurities in the raw materials, thereby improving the quality of the finished drilling fluid product. The impurities are collected in the collection groove between the tubular baffle and the inner wall of the filter cylinder, which also facilitates the subsequent unified treatment of the impurities.

[0010] Furthermore, a method for preparing a low-density environmentally friendly drilling fluid is applied to the above-mentioned low-density environmentally friendly drilling fluid production equipment; comprising the following steps:

[0011] S1. Lift the cover plate from the upper end of the preparation tube, then pour the raw materials into the preparation tube according to the proportion, and then cover the cover plate. At this time, the lower end of the feed pipe is immersed in the raw materials;

[0012] S2, start the motor, which drives the central shaft to rotate, and then the feeding spiral blade rotates, so that the raw materials are transported upward along the feeding pipe, flow through the tubular baffle and the filter, and then are discharged into the raw materials outside the feeding pipe again, and this cycle is repeated to achieve uniform mixing of the raw materials;

[0013] S3. When the raw material flows through the filter screen, the filter screen filters the impurities in the raw material. Due to the obstruction of the tubular baffle and the flow of the raw material fluid, the impurities will eventually gather in the collection groove between the tubular baffle and the inner wall of the filter cylinder;

[0014] S4. When the low-density environmentally friendly drilling fluid is prepared, turn off the motor, remove the cover plate, loosen the bolts between the filter cartridge and the feed pipe, remove the filter cartridge from the upper end of the feed pipe, and remove the tubular baffle together with the filter cartridge, so that the impurities in the collection tank can be cleaned;

[0015] S5. Place the liquid storage barrel under the discharge pipe and remove the sealing plug from the discharge pipe. Then, the prepared low-density environmentally friendly drilling fluid can be discharged through the discharge pipe and flow into the liquid storage barrel.

[0016] Among them, the raw materials used to prepare low-density environmentally friendly drilling fluid include: clean water: 800 parts to 1100 parts; bentonite: 70 parts to 86 parts; wall protective agent: 4 parts to 6 parts; cellulose: 0.7 parts to 1.3 parts; dehydration agent: 0.75 parts to 1.4 parts; soda ash: 0.82 parts to 1.5 parts.

[0017] Compared with traditional drilling fluids, the above-mentioned design has stronger inhibition, sealing and lubricity, can effectively stabilize mudstone and shale, improve the integrity of cuttings and mechanical drilling speed, reduce the torque and resistance of downhole drilling tools, and reduce the pressure problem in sliding drilling;

[0018] It can significantly save the total drilling cost, and effectively solve the problems of oil-based drilling fluid, environmental protection and waste disposal; it improves environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2 is an exploded view of the present invention;

[0021] Figure 3 is a cross-sectional schematic diagram of the present invention;

[0022] Figure 4 The present invention Figure 1 The enlarged schematic diagram at A in the middle;

[0023] Figure 5 It is a structural schematic diagram of the stirring mechanism in the present invention;

[0024] Figure 6 It is an exploded view of the stirring mechanism in the present invention.

[0025] In the figure:

[0026] 10. Preparation cylinder; 11. Bracket; 13. Cover plate; 14. Motor; 15. Round hole; 16. First connecting rod; 17. Discharge pipe; 18. Sealing plug; 19. Spline sleeve; 20. Feed pipe; 21. Filter cylinder; 22. Feed spiral blade; 23. Center axis; 24. Tubular baffle; 25. Filter screen; 26. Second connecting rod; 27. Fixing plate; 28. Bushing. DETAILED DESCRIPTION

[0027] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of simplifying the description of the present invention, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0028] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is specifically described in conjunction with the embodiments below. It should be understood that the following text is only used to describe one or several specific embodiments of the present invention, and does not strictly limit the scope of protection of the specific claims of the present invention. As used herein, the terms up, down and left, right are not limited to their strict geometric definitions, but include reasonable and inconsistent tolerances for machining or human errors. The specific features of the low-density environmentally friendly drilling fluid production equipment are described in detail below:

[0029] Embodiment 1

[0030] Reference Figure 1-Figure 6 The present invention provides a low-density environmentally friendly drilling fluid production equipment, including a preparation barrel 10, wherein a stirring structure is arranged in the preparation barrel 10, the stirring mechanism includes a filter barrel 21, a feed pipe 20 and a feed spiral blade 22, the feed spiral blade 22 is rotatably arranged in the feed pipe 20, the upper end of the feed pipe 20 is fixedly connected to the lower end of the filter barrel 21, the feed pipe 20 and the filter barrel 21 are arranged, the upper end of the filter barrel 21 is closed, a through groove penetrating the peripheral wall of the filter barrel 21 is opened, a filter screen 25 is fixed in the through groove, a tubular baffle 24 is fixed in the filter barrel 21, a collecting groove is formed between the outer periphery of the tubular baffle 24 and the inner wall of the filter barrel 21, and the lower end of the collecting groove is closed.

[0031] The filter screen 25 can filter the impurities in the drilling fluid raw material passing through the filter screen 25, and the impurities after filtering are collected in the collection tank for subsequent unified processing.

[0032] The feed pipe 20 is fixed to the inner wall of the preparation cylinder 10 through a plurality of first connecting rods 16. The motor 14 is fixed to the upper end surface of the filter cylinder 21. The lower end of the rotating shaft of the motor 14 is fixed to a spline sleeve 19. A central shaft 23 is arranged in the feed pipe 20. The upper end of the central shaft 23 is splined in the spline sleeve 19.

[0033] The spline connection between the upper end of the central shaft 23 and the spline sleeve 19 makes it easy to disassemble the central shaft 23 and the spline sleeve 19. When the filter cartridge 21 is disassembled, the spline sleeve 19 can be separated from the upper end of the central shaft 23.

[0034] A shaft sleeve 28 is rotatably connected to the central shaft 23 , and the shaft sleeve 28 is fixed to the inner wall of the upper end of the material conveying pipe 20 through a plurality of second connecting rods 26 .

[0035] The arrangement of the shaft sleeve 28 increases the stability of the central shaft 23 when it rotates.

[0036] The lower end of the filter cartridge 21 is fixedly connected to the upper end of the feed pipe 20 by bolts. A circle of fixing plates 27 is fixedly provided on the outer periphery of the lower end of the tubular baffle 24. An annular groove is opened in the lower end surface of the filter cartridge 21. The fixing plate 27 is embedded in the annular groove. The filter cartridge 21 and the feed pipe 20 clamp the fixing plate 27 and fix it between the filter cartridge 21 and the feed pipe 20.

[0037] The setting of the fixing plate 27 enables the tubular baffle 24 to be fixed when the filter cartridge 21 is fixed to the feed pipe 20, and also facilitates the removal of the tubular baffle 24 when the filter cartridge 21 is disassembled from the feed pipe 20, thereby facilitating the disposal of impurities in the collection tank.

[0038] A discharge pipe 17 connected to the preparation cylinder 10 is fixed on the lower side of the preparation cylinder 10, and a sealing plug 18 is embedded in the discharge pipe 17. A plurality of brackets 11 uniformly distributed circumferentially with the discharge pipe 17 as the center are fixed on the lower side of the preparation cylinder 10. A cover plate 13 for sealing the upper opening of the preparation cylinder 10 is provided on the upper end of the preparation cylinder 10. A circular hole 15 is opened in the cover plate 13 and penetrates along the thickness thereof. The circular hole 15 penetrates the upper end of the filter cylinder 21.

[0039] Embodiment 2

[0040] A method for preparing a low-density environmentally friendly drilling fluid comprises the following steps:

[0041] S1, lift the cover plate 13 from the upper end of the preparation tube 10, then pour the raw materials required for preparing the low-density environmentally friendly drilling fluid into the preparation tube 10, and then cover the cover plate 13, at this time, the lower end of the feed pipe 20 is immersed in the raw materials;

[0042] S2, start the motor 14, which drives the central shaft 23 to rotate, and then the feeding spiral blade 22 rotates, so that the raw material is transported upward along the feeding pipe 20, flows through the tubular baffle 24 and the filter 25, and then is discharged into the raw material outside the feeding pipe 20, and this cycle is repeated to achieve uniform mixing of the raw materials;

[0043] S3. When the raw material flows through the filter screen 25, the filter screen 25 filters the impurities in the raw material. Due to the obstruction of the tubular baffle 24 and the flow of the raw material fluid, the impurities will eventually gather in the collection groove between the tubular baffle 24 and the inner wall of the filter cylinder 21;

[0044] S4. When the low-density environmentally friendly drilling fluid is prepared, turn off the motor 14, remove the cover plate 13, loosen the bolts between the filter cartridge 21 and the feed pipe 20, remove the filter cartridge 21 from the upper end of the feed pipe 20, and remove the tubular baffle 24 together with the filter cartridge 21, so that the impurities in the collection tank can be cleaned;

[0045] S5. Place the liquid storage barrel on the lower side of the discharge pipe 17 and take out the sealing plug 18 from the discharge pipe 17. Then, the prepared low-density environmentally friendly drilling fluid can be discharged through the discharge pipe 17 and flow into the liquid storage barrel.

[0046] The raw materials used to prepare the low-density environmentally friendly drilling fluid include: clean water: 800 parts; bentonite: 70 parts; wall protective agent: 4 parts; cellulose: 0.7 parts; dehydration agent: 0.75 parts; soda ash: 0.82 parts;

[0047] Embodiment 3

[0048] A method for preparing a low-density environmentally friendly drilling fluid comprises the following steps:

[0049] S1, lift the cover plate 13 from the upper end of the preparation tube 10, then pour the raw materials required for preparing the low-density environmentally friendly drilling fluid into the preparation tube 10, and then cover the cover plate 13, at this time, the lower end of the feed pipe 20 is immersed in the raw materials;

[0050] S2, start the motor 14, which drives the central shaft 23 to rotate, and then the feeding spiral blade 22 rotates, so that the raw material is transported upward along the feeding pipe 20, flows through the tubular baffle 24 and the filter 25, and then is discharged into the raw material outside the feeding pipe 20, and this cycle is repeated to achieve uniform mixing of the raw materials;

[0051] S3. When the raw material flows through the filter screen 25, the filter screen 25 filters the impurities in the raw material. Due to the obstruction of the tubular baffle 24 and the flow of the raw material fluid, the impurities will eventually gather in the collection groove between the tubular baffle 24 and the inner wall of the filter cylinder 21;

[0052] S4. When the low-density environmentally friendly drilling fluid is prepared, turn off the motor 14, remove the cover plate 13, loosen the bolts between the filter cartridge 21 and the feed pipe 20, remove the filter cartridge 21 from the upper end of the feed pipe 20, and remove the tubular baffle 24 together with the filter cartridge 21, so that the impurities in the collection tank can be cleaned;

[0053] S5. Place the liquid storage barrel on the lower side of the discharge pipe 17 and take out the sealing plug 18 from the discharge pipe 17. Then, the prepared low-density environmentally friendly drilling fluid can be discharged through the discharge pipe 17 and flow into the liquid storage barrel.

[0054] The raw materials used to prepare the low-density environmentally friendly drilling fluid include: clean water: 1100 parts; bentonite: 86 parts; wall protective agent: 6 parts; cellulose: 1.3 parts; dehydration agent: 1.4 parts; soda ash: 1.5 parts;

[0055] Embodiment 4

[0056] A method for preparing a low-density environmentally friendly drilling fluid comprises the following steps:

[0057] S1, lift the cover plate 13 from the upper end of the preparation tube 10, then pour the raw materials required for preparing the low-density environmentally friendly drilling fluid into the preparation tube 10, and then cover the cover plate 13, at this time, the lower end of the feed pipe 20 is immersed in the raw materials;

[0058] S2, start the motor 14, which drives the central shaft 23 to rotate, and then the feeding spiral blade 22 rotates, so that the raw material is transported upward along the feeding pipe 20, flows through the tubular baffle 24 and the filter 25, and then is discharged into the raw material outside the feeding pipe 20, and this cycle is repeated to achieve uniform mixing of the raw materials;

[0059] S3. When the raw material flows through the filter screen 25, the filter screen 25 filters the impurities in the raw material. Due to the obstruction of the tubular baffle 24 and the flow of the raw material fluid, the impurities will eventually gather in the collection groove between the tubular baffle 24 and the inner wall of the filter cylinder 21;

[0060] S4. When the low-density environmentally friendly drilling fluid is prepared, turn off the motor 14, remove the cover plate 13, loosen the bolts between the filter cartridge 21 and the feed pipe 20, remove the filter cartridge 21 from the upper end of the feed pipe 20, and remove the tubular baffle 24 together with the filter cartridge 21, so that the impurities in the collection tank can be cleaned;

[0061] S5. Place the liquid storage barrel on the lower side of the discharge pipe 17 and take out the sealing plug 18 from the discharge pipe 17. Then, the prepared low-density environmentally friendly drilling fluid can be discharged through the discharge pipe 17 and flow into the liquid storage barrel.

[0062] The raw materials used to prepare the low-density environmentally friendly drilling fluid include: clean water: 1000 parts; bentonite: 74 parts; wall protective agent: 5.6 parts; cellulose: 1 part; dehydration agent: 1 part; and soda ash: 1 part.

[0063] It will be clear to those skilled in the art that various modifications to the above embodiments may be made without departing from the overall spirit and concept of the present invention. All of these modifications fall within the scope of protection of the present invention. The protection scheme of the present invention shall be subject to the claims attached to the present invention.

Claims

1. A low-density environmentally friendly drilling fluid production device, comprising a preparation tube, characterized in that: A stirring structure is arranged in the preparation cylinder, and the stirring mechanism includes a filter cylinder, a feed pipe and a feed spiral blade, the feed spiral blade is rotatably arranged in the feed pipe, the upper end of the feed pipe is fixedly connected to the lower end of the filter cylinder, the feed pipe is arranged with the filter cylinder, the upper end of the filter cylinder is closed, a through groove penetrating the peripheral wall of the filter cylinder is opened, a filter screen is fixed in the through groove, a tubular baffle is fixed in the filter cylinder, a collecting groove is formed between the outer periphery of the tubular baffle and the inner wall of the filter cylinder, and the lower end of the collecting groove is closed.

2. The low-density environmentally friendly drilling fluid production equipment according to claim 1, characterized in that: The feed pipe is fixed to the inner wall of the preparation cylinder through a plurality of first connecting rods, a motor is fixed to the upper end surface of the filter cylinder, a spline sleeve is fixed to the lower end of the rotating shaft of the motor, a central shaft is arranged in the feed pipe, and the upper end of the central shaft is splined in the spline sleeve.

3. The low-density environmentally friendly drilling fluid production equipment according to claim 2, characterized in that: A shaft sleeve is rotatably connected to the central shaft, and the shaft sleeve is fixed to the inner wall of the upper end of the material conveying pipe through a plurality of second connecting rods.

4. The low-density environmentally friendly drilling fluid production equipment according to claim 1, characterized in that: The lower end of the filter cartridge is fixedly connected to the upper end of the feed pipe by bolts, a circle of fixing plates is fixedly provided on the outer periphery of the lower end of the tubular baffle, an annular groove is opened in the lower end surface of the filter cartridge, the fixing plate is embedded in the annular groove, the filter cartridge and the feed pipe clamp the fixing plate and fix it between the filter cartridge and the feed pipe.

5. The low-density environmentally friendly drilling fluid production equipment according to claim 1, characterized in that: A discharge pipe connected to the preparation cylinder is fixed on the lower side of the preparation cylinder, a sealing plug is embedded in the discharge pipe, a plurality of brackets evenly distributed circumferentially with the discharge pipe as the center are fixed on the lower side of the preparation cylinder, a cover plate for sealing the upper opening of the preparation cylinder is provided at the upper end of the preparation cylinder, a circular hole is opened in the cover plate and penetrates through the thickness thereof, and the circular hole is penetrated at the upper end of the filter cylinder.

6. A method for preparing a low-density environmentally friendly drilling fluid, characterized in that: The low-density environmentally friendly drilling fluid production equipment applied to any one of claims 1 to 5 above comprises the following steps: S1. Lift the cover plate from the upper end of the preparation tube, then pour the raw materials into the preparation tube according to the proportion, and then cover the cover plate. At this time, the lower end of the feed pipe is immersed in the raw materials; S2, start the motor, which drives the central shaft to rotate, and then the feeding spiral blade rotates, so that the raw materials are transported upward along the feeding pipe, flow through the tubular baffle and the filter, and then are discharged into the raw materials outside the feeding pipe again, and this cycle is repeated to achieve uniform mixing of the raw materials; S3. When the raw material flows through the filter screen, the filter screen filters the impurities in the raw material. Due to the obstruction of the tubular baffle and the flow of the raw material fluid, the impurities will eventually gather in the collection groove between the tubular baffle and the inner wall of the filter cylinder; S4. When the low-density environmentally friendly drilling fluid is prepared, turn off the motor, remove the cover plate, loosen the bolts between the filter cartridge and the feed pipe, remove the filter cartridge from the upper end of the feed pipe, and remove the tubular baffle together with the filter cartridge, so that the impurities in the collection tank can be cleaned; S5. Place the liquid storage barrel under the discharge pipe and remove the sealing plug from the discharge pipe. Then, the prepared low-density environmentally friendly drilling fluid can be discharged through the discharge pipe and flow into the liquid storage barrel.

7. The method for preparing a low-density environmentally friendly drilling fluid according to claim 6, characterized in that: The raw materials used to prepare the low-density environmentally friendly drilling fluid include: clean water: 800 parts to 1100 parts; bentonite: 70 parts to 86 parts; wall protecting agent: 4 parts to 6 parts; cellulose: 0.7 parts to 1.3 parts; dehydrating agent: 0.75 parts to 1.4 parts; and soda ash: 0.82 parts to 1.5 parts.

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