A process for the manufacture of frac quartz

Abstract

The application discloses a processing technology of quartz sand for fracturing, and relates to the field of quartz sand processing technology, which comprises the following steps: crushing a quartz sand mine; screening the crushed quartz sand to screen out required to-be-used materials; performing desliming treatment on the to-be-used materials; classifying the to-be-used materials according to weight in a centrifugal manner, and obtaining intermediate particles meeting quality requirements; and performing magnetic separation on the intermediate particles, so as to obtain qualified quartz sand particles. The application has the effect of removing impurities heavier than qualified quartz sand and / or lighter than qualified quartz sand in the quartz sand, thereby helping to improve the quality of the quartz sand.

Description

Technical Field

[0001] This application relates to the field of quartz sand processing technology, and in particular to a processing technology for quartz sand used in fracturing. Background Technology

[0002] Quartz sand for fracturing is an indispensable material in oil and gas field development. With its high hardness, excellent wear resistance, pressure resistance, and corrosion resistance, it plays a crucial role in fracturing operations in oil, gas, and water wells. In oil and gas field development, injecting quartz sand into the wellbore under high pressure effectively breaks up the rock, forming a fracture network, thereby improving the extraction efficiency of oil and gas resources.

[0003] A patent with publication number CN109909150B discloses a quartz sand production process, which includes the following steps: a) Coarse screening: The quartz sand ore is crushed, and the crushed quartz sand is screened for the first time using a linear vibrating screen to separate quartz sand into 20-100 mesh sizes; b) Washing: The 20-100 mesh quartz sand is placed into a washing device for cleaning and then conveyed out; c) Dewatering: The washing device includes a dewatering unit, and the quartz sand is dewatered after flowing out of the washing device; d) Drying: The dewatered quartz sand is dried; e) Fine screening: The dried quartz sand is placed into a grading vibrating screen for a second screening to separate quartz sand of different particle sizes. This invention has the effect of reducing heat consumption during the drying process.

[0004] However, even after screening, the particle size of the quartz sand can meet the requirements, but there are often some impurities in the quartz sand mine. These impurities are crushed into particles and mixed in with the quartz sand, resulting in poor quality of the quartz sand, which urgently needs to be improved. Summary of the Invention

[0005] In order to improve the problem of poor quality quartz sand caused by impurities mixed in the quartz sand in related technologies, this application provides a processing technology for quartz sand used in fracturing.

[0006] This application provides a processing technology for fracturing quartz sand, which adopts the following technical solution:

[0007] A processing method for fracturing quartz sand includes the following steps:

[0008] Crushing of quartz sand ore;

[0009] The crushed quartz sand is screened to select the material that meets the requirements for use.

[0010] Desliming treatment is performed on the materials to be used;

[0011] The materials to be processed are sorted by weight using centrifugation to obtain intermediate particles that meet quality requirements;

[0012] Magnetic separation is performed on the intermediate particles to obtain qualified quartz sand particles.

[0013] By adopting the above technical solution and using centrifugation to classify the material to be used by weight, impurities that are heavier than qualified quartz sand and / or lighter than qualified quartz sand can be removed, thereby helping to improve the quality of quartz sand.

[0014] Preferably, a centrifuge is used to classify the materials to be used by weight;

[0015] The centrifuge device includes a frame, on which a spiral channel is provided. The spiral channel has a vertical circumferential axis, and a flow divider is provided at the lower end of the spiral channel, which divides the lower end of the spiral channel into two discharge ports.

[0016] When classifying materials to be used, place the materials to be used at the top of the spiral channel.

[0017] By adopting the above technical solution, in practical application, the material to be used is placed into the spiral channel from the top and slides down the spiral channel under the action of gravity. As the material slides down the spiral channel, it is subjected to centrifugal force, causing lighter particles to move towards the outside of the spiral channel and heavier particles to move towards the inside, thus classifying them. Finally, the heavier particles are discharged through the first outlet, and the lighter particles are discharged through the second outlet. This effectively achieves the classification of the material to be used.

[0018] It should be noted that when classifying materials to be used solely through a spiral channel, lighter or heavier materials can be selected as needed.

[0019] Preferably, the spiral channels are provided in multiple ways, and the multiple spiral channels include a first centrifugal channel and a second centrifugal channel. There are two second centrifugal channels, and both second centrifugal channels are located below the first centrifugal channel.

[0020] The first centrifugal channel has two discharge ports, namely the first discharge port and the second discharge port, and the first discharge port is located inside the second discharge port.

[0021] The upper ends of the two second centrifugal channels are respectively connected to the first discharge port and the second discharge port. The two discharge ports of the second centrifugal channel connected to the first discharge port are the third discharge port and the fourth discharge port, and the third discharge port is located inside the fourth discharge port. The two discharge ports of the second centrifugal channel connected to the second discharge port are the fifth discharge port and the sixth discharge port, and the fifth discharge port is located inside the sixth discharge port.

[0022] In the step of classifying the material to be used by weight using a centrifugal device, the material flowing out through the fourth and fifth discharge ports is intermediate particles.

[0023] By adopting the above technical solution, in practical application, the materials classified by the first centrifugal channel enter two second centrifugal channels through the first and second discharge ports, respectively, where heavier and lighter materials are further classified. Finally, the heavier materials discharged from the third discharge port and the lighter materials discharged from the sixth discharge port are both unqualified materials, while the materials flowing out through the fourth and fifth discharge ports are intermediate particles. In this way, on the one hand, heavier and lighter unqualified materials are separated from the materials to be used, and on the other hand, the qualified materials carried by the unqualified materials are reduced.

[0024] Preferably, the flow divider is slidably disposed at the lower port of the spiral channel along the width direction of the bottom wall of the lower port of the spiral channel, and the lower end of the spiral channel is further provided with a driving component for driving the flow divider to slide.

[0025] By adopting the above technical solution, in practical applications, workers can drive the flow divider plate to slide through the drive components, adjust the position of the flow divider plate, and adjust the flow divider plate according to the required quality of quartz sand particles, so that the spiral channel can reasonably screen out impurities, thereby helping to improve the applicability of the spiral channel to screening impurities in quartz sand of various particle sizes.

[0026] Preferably, the driving component includes a lead screw, which is arranged along the sliding direction of the splitter plate. The lead screw is rotatably mounted on the side wall of the spiral channel and passes through the splitter plate and is threadedly connected to the splitter plate.

[0027] By adopting the above technical solution, in practical applications, rotating the lead screw drives the flow plate to move, which facilitates the adjustment of the flow plate position and helps to ensure the stability of the flow plate.

[0028] Preferably, in the step of sorting the materials to be used by weight using centrifugation, the materials to be used and the liquid enter the spiral channel together.

[0029] By adopting the above technical solution, the materials to be used and the water are fed into the spiral channel together. The water can act as a lubricant and encapsulate the materials to be used, reducing the friction between the materials to be used and the spiral channel. This reduces the occurrence of bridging and blockage of the materials to be used in the spiral channel, which helps to ensure that the spiral channel can properly classify the materials to be used.

[0030] Preferably, the outer side of any segment of the spiral channel is higher than the inner side.

[0031] By adopting the above technical solution, the occurrence of a large amount of material crowding on the outside of the spiral channel under the action of centrifugal force can be reduced.

[0032] Preferably, the bottom wall of the spiral channel is provided with a disintegration protrusion.

[0033] By adopting the above technical solution, the dispersing protrusions disperse the aggregated materials to be used, reducing the occurrence of the aggregated materials carrying heavier or lighter particles, which helps to improve the sorting effect of the spiral channel on the materials to be used.

[0034] Preferably, the spiral channel is made of elastic sheet material, the spiral channel includes several layered channels, each layer of the layered channel has a connecting lug fixed on its outer side, a support column is vertically fixed on the frame, the support column passes through each connecting lug, and the support column is threaded with adjusting nuts on the upper and lower sides of each connecting lug.

[0035] By adopting the above technical solution, in practical applications, workers can rotate the adjusting nut according to the required qualified particle size and weight of the quartz sand, so that the spiral channel is extended or compressed, thereby changing the slope of each layer of the spiral channel, increasing or decreasing the downward speed of the intermediate particles, adjusting the centripetal force on the intermediate particles, and thus helping to improve the applicability of the spiral channel to the sorting operation of quartz sand with different particle sizes and weights.

[0036] Preferably, a limiting post is vertically fixed on the frame. The limiting post is located on the side of the spiral channel away from the supporting post and is spaced apart from the spiral channel. A mounting frame is slidably mounted on the limiting post. A fixing member is detachably connected between the limiting post and the mounting frame. The mounting frame is provided with a clamping component for clamping the layered channel.

[0037] By adopting the above technical solution, in practical applications, the edge of the layered channel is clamped by the clamping component, and the mounting bracket is locked and fixed to the limiting post by the fixing component, which helps to improve the stability and load-bearing capacity of the spiral channel.

[0038] Preferably, the clamping component includes a clamping plate and a lead screw. The clamping plate is slidably connected to the mounting frame in the vertical direction. Two clamping plates are arranged parallel to each other in the vertical direction. The lead screw is vertical and is mounted on the mounting frame around its axis. The threads on both sides of the lead screw are in opposite directions. The two sides of the lead screw pass through the two clamping plates respectively and are threadedly connected to the corresponding clamping plates.

[0039] By adopting the above technical solution, in practical applications, rotating the lead screw can drive the two clamping plates to move closer or further apart, thereby facilitating the clamping or releasing of the layered channel. Attached Figure Description

[0040] Figure 1 Example 1 is a flowchart illustrating the processing technology of quartz sand for fracturing.

[0041] Figure 2 This is an isometric schematic diagram of the overall structure of the centrifuge device, which is the main feature of Example 1.

[0042] Figure 3 This is a schematic diagram illustrating the spiral channel structure, as shown in Example 1.

[0043] Figure 4 This is a schematic diagram illustrating the main structure of the drive component in Embodiment 1;

[0044] Figure 5 This is a schematic diagram illustrating the spiral channel structure, as shown in Example 2.

[0045] Figure 6 This is a partially exploded view of the limiting groove and sliding key structure, which is the main features of Embodiment 2.

[0046] Figure 7 This is a schematic diagram illustrating the structure of the clamping component, which is the main feature of Embodiment 2.

[0047] Reference numerals: 1. Frame; 2. Central column; 3. Spiral channel; 31. Feed inlet; 32. Diverter plate; 33. Dispersion protrusion; 34. First centrifugal channel; 341. First discharge port; 342. Second discharge port; 35. Second centrifugal channel; 351. Third discharge port; 352. Fourth discharge port; 353. Fifth discharge port; 354. Sixth discharge port; 36. Layered channel; 361. Connecting lug; 362. Slide key; 4. Drive component; 41. Lead screw; 42. Handwheel; 5. Support column; 51. Adjusting nut; 52. Limiting groove; 6. Limiting column; 7. Mounting bracket; 71. Locking bolt; 8. Clamping component; 81. Clamping plate; 82. Lead screw; 83. Rotary handle. Detailed Implementation

[0048] The present application will be further described in detail below with reference to the accompanying drawings.

[0049] This application discloses a processing technology for fracturing quartz sand.

[0050] Example 1:

[0051] Reference Figure 1 The processing technology for fracturing quartz sand includes the following steps:

[0052] S1, Crushing operation.

[0053] Crushing of quartz sand ore is carried out using crushers, ball mills, etc., with ball mills being the preferred choice.

[0054] S2, Screening operation.

[0055] A screening machine is used to screen the crushed quartz sand, separating out the material that meets the requirements for use. In this embodiment, the material that meets the requirements mainly refers to the material that passes through the screening machine screen and whose size meets the requirements. For materials that are difficult to pass through the screening machine screen, a further crushing operation will be performed.

[0056] S3, Desliming treatment.

[0057] The material to be used is fed into the desliming hopper along with the water to perform the desliming operation.

[0058] S4. Centrifugal classification.

[0059] The deslimed material is fed into a centrifuge along with the liquid. The centrifuge then sorts the material by weight and obtains intermediate particles that meet the quality requirements.

[0060] Specifically, see Figure 2 and Figure 3 The centrifuge device includes a frame 1, on which a central column 2 is vertically fixed. A spiral channel 3 is arranged around the axis of the central column 2, and the inner sidewall of the spiral channel 3 is fixedly connected to the central column 2. A feed inlet 31 is provided at the upper end of the spiral channel 3, and a flow divider 32 is provided at the lower end of the spiral channel 3, dividing the lower end of the spiral channel 3 into two discharge outlets. Furthermore, the outer side of any section of the spiral channel 3 is higher than the inner side. Dispersing protrusions 33 are provided on the inner bottom wall of the spiral channel 3. In this embodiment, multiple dispersing protrusions 33 are provided on the upper part of the spiral channel 3, and additional ones are provided on the lower part of the spiral channel 3, to prevent the dispersing protrusions 33 from disrupting the centrifuged and sorted quartz sand.

[0061] Three spiral channels 3 are provided on the frame 1, with a one-to-one correspondence between the central column 2 and the spiral channel 3. The three spiral channels 3 include a first centrifugal channel 34 and two second centrifugal channels 35. Both the first centrifugal channel 34 and the second centrifugal channel 35 are spiral channels 3, and both second centrifugal channels 35 are located below the first centrifugal channel 34. The two discharge ports of the first centrifugal channel 34 are the first discharge port 341 and the second discharge port 342, with the first discharge port 341 located inside the second discharge port 342. The inlets 31 of the two second centrifugal channels 35 are respectively connected to the first discharge port 341 and the second discharge port 342 via flexible hoses. The two outlets of the second centrifugal channel 35 connected to the first outlet 341 are the third outlet 351 and the fourth outlet 352, with the third outlet 351 located inside the fourth outlet 352; the two outlets of the second centrifugal channel 35 connected to the second outlet 342 are the fifth outlet 353 and the sixth outlet 354, with the fifth outlet 353 located inside the sixth outlet 354.

[0062] See Figure 2 and Figure 3 To improve the centrifugal sorting of various materials in the spiral channel 3, the lower part of the spiral channel 3 is designed as a straight section. The diverter plate 32 is slidably disposed at the lower port of the spiral channel 3 along the width direction of the bottom wall of the lower port. The lower end of the spiral channel 3 is also provided with a driving component 4 for driving the diverter plate 32 to slide. The driving component 4 includes a lead screw 41 and a handwheel 42. The lead screw 41 is disposed along the sliding direction of the diverter plate 32 and is rotatably mounted on the side wall of the spiral channel 3. The lead screw 41 passes through the diverter plate 32 and is threadedly connected to the diverter plate 32. The lower side of the diverter plate 32 abuts against the bottom wall of the lower port of the spiral channel 3. The handwheel 42 is fixed to the end of the lead screw 41.

[0063] It should be noted that the bottom walls of the first discharge port 341 and the second discharge port 342 are respectively provided with openings for connecting to the corresponding second centrifugal channel 35 at positions opposite to each other, thereby reserving space for the diversion plate 32 to move.

[0064] In the centrifugal sorting operation, the deslimed material is fed into the inlet 31 of the first centrifugal channel 34 along with the liquid. The material and liquid flow downwards within the first centrifugal channel 34. Under centrifugal force, lighter particles move towards the outer side of the spiral channel 3, while heavier particles move towards the inner side. The heavier and lighter particles are discharged through the first outlet 341 and the second outlet 342, respectively, and enter the corresponding second centrifugal channel 35. Similarly, the heavier and lighter particles are further sorted in the corresponding second centrifugal channel 35. Finally, the heavier material discharged from the third outlet 351 and the lighter material discharged from the sixth outlet 354 are both considered substandard materials. The materials flowing out through the fourth outlet 352 and the fifth outlet 353 are intermediate particles.

[0065] S5, Magnetic separation operation.

[0066] The intermediate particles are subjected to magnetic separation by a magnetic separator to remove magnetic impurities, thereby obtaining qualified quartz sand particles.

[0067] S6. Water removal operation.

[0068] To remove water from quartz sand particles, drying equipment or baking equipment can be used. In other embodiments, a dewatering screening machine can also be used to dewater the quartz sand particles.

[0069] Example 2:

[0070] Reference Figure 5 and Figure 6The difference between this embodiment and Embodiment 1 is that the spiral channel 3 is made of an elastic material, such as a thin stainless steel plate or a plastic plate, and there is no central column 2 in the middle of the spiral channel 3. Furthermore, the installation structure of the three spiral channels 3 on the frame 1 is the same. The following description will focus on one of the spiral channels 3 as an example.

[0071] The spiral channel 3 includes several layered channels 36, each layered channel 36 having a connecting lug 361 fixed to its outer side. All connecting lugs 361 are located on the same side of the spiral channel 3. A support column 5 is vertically fixed on the frame 1. The support column 5 is a screw rod that passes through each connecting lug 361. Adjusting nuts 51 are threaded onto both the upper and lower sides of each connecting lug 361, and each connecting lug 361 is clamped by two corresponding adjusting nuts 51. Furthermore, a limiting groove 52 is formed on one side of the support column 5, and the limiting groove 52 is set along the axis of the support column 5. A sliding key 362 is fixed on the connecting lug 361, and the sliding key 362 is embedded in the limiting groove 52 and slides in cooperation with the limiting groove 52.

[0072] Also see Figure 5 and Figure 7 A limiting post 6 is vertically fixed on the frame 1. The limiting post 6 is located on the side of the spiral channel 3 away from the support post 5, and the limiting post 6 is spaced apart from the spiral channel 3. A mounting bracket 7 is slidably mounted on the limiting post 6. A fixing component is detachably connected between the limiting post 6 and the mounting bracket 7. The mounting bracket 7 is provided with a clamping component 8 for clamping the layered channel 36.

[0073] Specifically, the limiting post 6 passes through the mounting frame 7 and is slidably connected to the mounting frame 7. The fixing component is a locking bolt 71, which is threadedly connected to the mounting frame 7, and the end of the locking bolt 71 abuts against the limiting post 6. The clamping component 8 includes a clamping plate 81 and a lead screw 82. The lead screw 82 is vertical and is mounted on the mounting frame 7 around its axis. The threads on both sides of the lead screw 82 are in opposite directions. The clamping plate 81 is horizontal. The side of the mounting frame 7 near the spiral channel 3 is vertical. One side of the clamping plate 81 abuts against the vertical surface of the mounting frame 7, and the other side of the clamping plate 81 extends towards the spiral channel 3. Two clamping plates 81 are arranged parallel to each other in the vertical direction. The two sides of the lead screw 82 pass through the two clamping plates 81 respectively and are threadedly connected to the corresponding clamping plates 81. The clamping component 8 also includes a rotating handle 83, which is fixed to one end of the lead screw 82. Furthermore, the mounting bracket 7, the locking bolt 71, and the clamping component 8 each correspond one-to-one with the layered channel 36.

[0074] Before centrifuging the quartz sand, the operator can loosen all the adjusting nuts 51 according to the required qualified particle size and weight of the quartz sand, so that the adjusting nuts 51 are spaced apart from the connecting ears 361 of the corresponding layer channels 36. Then, the adjusting nuts 51 can be adjusted from bottom to top to make the spiral channel 3 extend upward or compress downward, thereby changing the slope of each layer channel 36 of the spiral channel 3. Subsequently, the height of each mounting bracket 7 and clamping component 8 can be adjusted. By rotating the screw 82 through the handle 83, the two clamping plates 81 in each clamping component 8 clamp the corresponding layer channel 36, and the mounting bracket 7 is fixed to the limiting post 6 by the locking bolt 71.

[0075] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A processing technology for fracturing quartz sand, characterized in that: Includes the following steps: Crushing of quartz sand ore; The crushed quartz sand is screened to select the material that meets the requirements for use. Desliming treatment of the materials to be used; The materials to be processed are sorted by weight using centrifugation to obtain intermediate particles that meet quality requirements; Magnetic separation is performed on the intermediate particles to obtain qualified quartz sand particles; The materials to be used are sorted by weight using a centrifugal device; The centrifuge device includes a frame (1), on which a spiral channel (3) is provided. The spiral channel (3) has a vertical circumferential axis. A flow divider (32) is provided at the lower port of the spiral channel (3), which divides the lower port of the spiral channel (3) into two discharge ports. When classifying materials to be used, place the materials to be used into the upper end of the spiral channel (3); The spiral channel (3) is provided in multiple ways, and the multiple spiral channels (3) include a first centrifugal channel (34) and a second centrifugal channel (35). There are two second centrifugal channels (35), and both second centrifugal channels (35) are located below the first centrifugal channel (34). The two outlets of the first centrifugal channel (34) are the first outlet (341) and the second outlet (342), and the first outlet (341) is located inside the second outlet (342); The upper ends of the two second centrifugal channels (35) are respectively connected to the first discharge port (341) and the second discharge port (342). The two discharge ports of the second centrifugal channel (35) connected to the first discharge port (341) are the third discharge port (351) and the fourth discharge port (352), respectively. The third discharge port (351) is located inside the fourth discharge port (352). The two discharge ports of the second centrifugal channel (35) connected to the second discharge port (342) are the fifth discharge port (353) and the sixth discharge port (354), respectively. The fifth discharge port (353) is located inside the sixth discharge port (354). In the step of classifying the material to be used by weight using a centrifugal device, the material flowing out through the fourth discharge port (352) and the fifth discharge port (353) is intermediate particles; The spiral channel (3) is made of elastic plate. The spiral channel (3) includes several layered channels (36). Each layer of the layered channel (36) has a connecting lug (361) fixed on its outer side. A support column (5) is vertically fixed on the frame (1). The support column (5) passes through each connecting lug (361). The support column (5) is threaded with adjusting nuts (51) on the upper and lower sides of each connecting lug (361). A limiting post (6) is vertically fixed on the frame (1). The limiting post (6) is located on the side of the spiral channel (3) away from the support post (5) and the limiting post (6) is spaced apart from the spiral channel (3). A mounting bracket (7) is slidably provided on the limiting post (6). A fixing member is detachably connected between the limiting post (6) and the mounting bracket (7). A clamping component (8) for clamping the layered channel (36) is provided on the mounting bracket (7).

2. The processing technology of fracturing quartz sand according to claim 1, characterized in that: The diverter plate (32) is slidably disposed at the lower port of the spiral channel (3) along the width direction of the bottom wall of the lower port of the spiral channel (3). The lower end of the spiral channel (3) is also provided with a driving component (4) for driving the diverter plate (32) to slide.

3. The processing technology for fracturing quartz sand according to claim 2, characterized in that: The driving component (4) includes a lead screw (41), which is arranged along the sliding direction of the diverter plate (32). The lead screw (41) is rotatably mounted on the side wall of the spiral channel (3), and the lead screw (41) passes through the diverter plate (32) and is threadedly connected to the diverter plate (32).

4. The processing technology of fracturing quartz sand according to claim 1, characterized in that: In the step of sorting the materials to be used by weight using centrifugation, the materials to be used and the liquid enter the spiral channel together (3).

5. The processing technology of fracturing quartz sand according to claim 1, characterized in that: The outer side of any segment of the spiral channel (3) is higher than the inner side; The bottom wall of the spiral channel (3) is provided with a disintegration protrusion (33).

6. The processing technology of fracturing quartz sand according to claim 1, characterized in that: The clamping component (8) includes a clamping plate (81) and a lead screw (82). The clamping plate (81) is slidably connected to the mounting frame (7) in the vertical direction. There are two clamping plates (81) arranged in parallel in the vertical direction. The lead screw (82) is vertical and is mounted on the mounting frame (7) around its axis. The threads on both sides of the lead screw (82) are opposite. The two sides of the lead screw (82) pass through the two clamping plates (81) respectively and are threadedly connected to the corresponding clamping plates (81).

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