Quartz fracturing sand production system and production method

Abstract

The invention relates to the technical field of quartz fracturing sand production, and provides a quartz fracturing sand production system and method.The quartz fracturing sand production system comprises an ore washer, a screening device, a grit chamber, at least one sand and stone separation assembly and a recovery tank, and raw material sand in the grit chamber is pumped to a rotational flow device through a pressure pump; solid-liquid separation can be carried out on fluid raw materials through the rotational flow device, the solid-liquid separation effect is better compared with a conventional spiral type and water wheel type solid-liquid separation device, redundant water obtained after separation in the rotational flow device flows back to the recovery tank in a concentrated mode through the second pipeline, and due to the fact that a small amount of gravel is mixed in the backflow water, the solid-liquid separation effect is better. The part of sand and stone is conveyed to the grit chamber for circulation after being recovered and settled, so that the recycling of the sand and stone raw material can be realized, the waste of the sand and stone caused by directly discharging the liquid after solid-liquid separation is avoided, and the cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of quartz fracturing sand production, and in particular to a quartz fracturing sand production system and a production method. Background Art

[0002] Quartz fracturing sand is a proppant used in the petroleum industry. In the prior art, quartz fracturing sand is generally made of natural quartz sand, which is obtained through screening, impurity removal, water washing, grading, drying and other processes. The existing quartz sand production system uses a spiral method or a water wheel method for solid-liquid separation. The spiral method achieves solid-liquid separation by friction through 45-degree rotation, while the water wheel method achieves solid-liquid separation by draining water. However, since fracturing sand is very fine, it will become a fluid after mixing with water. The traditional solid-liquid separation method is difficult to meet the requirements, and the direct discharge of the sand-water mixture after solid-liquid separation will lead to waste of sand and gravel. Summary of the invention

[0003] In view of the above problems and technical requirements, the inventors have proposed a quartz fracturing sand production system and production method, which can improve the solid-liquid separation effect while solving the problem of sand and gravel waste after separation.

[0004] The technical solution of the present invention is as follows:

[0005] In a first aspect, the present invention provides a quartz fracturing sand production system, comprising:

[0006] Ore washing machine, used to wash the raw sand;

[0007] A screening device, the screening device is connected to the ore washer and is used to filter the washed raw sand;

[0008] A grit chamber, the grit chamber being located below the ground and used to collect the raw sand filtered by the screening device;

[0009] At least one group of sand and gravel separation components, the sand and gravel separation components include a cyclone device, a dewatering screen device and a scrubbing device arranged in sequence, the side of the cyclone device is connected to the grit chamber through a first pipeline, a pressure pump is arranged on the first pipeline, and is used to pump the raw sand in the grit chamber to the cyclone device, the cyclone device is used to perform solid-liquid separation on the raw sand, and the separated sand and gravel enter the dewatering screen device for dehydration;

[0010] A recovery tank is connected to the top of the cyclone device through a second pipeline, and recovers the sand-water mixture after solid-liquid separation. The recovery tank is connected to the grit tank.

[0011] Optionally, the sand and gravel separation components are at least two groups, and the sand and gravel separation components in each group are arranged side by side with intervals.

[0012] Optionally, the dewatering screen device and the scrubbing device in each group of the sand and gravel separation components are multiple groups, and the dewatering screen device and the scrubbing device are arranged alternately.

[0013] Optionally, the dewatering screen device comprises a primary dewatering mechanism and a secondary dewatering mechanism which are arranged in sequence;

[0014] The primary dehydration mechanism is used to perform primary dehydration on the sand and gravel;

[0015] The secondary dehydration mechanism comprises a spraying structure, and the spraying component is used for spraying water mist when the sand and gravel are dehydrated.

[0016] Optionally, the scrubbing device includes a multi-stage scrubbing mechanism, and the number of stages and scrubbing time required by the scrubbing mechanism are determined according to the sphericity of the quartz fracturing sand.

[0017] Optionally, in each group of the sand and gravel separation components, a support frame is provided at the bottom of the cyclone device, the dewatering screen device and the scrubbing device, and the height of the support frame decreases in sequence according to the transmission direction of the sand and gravel.

[0018] Optionally, the quartz fracturing sand production system further includes: a water tank; the water tank is connected to the drain outlets of the dewatering screen device through a manifold, respectively, to collect excess water after dehydration.

[0019] Optionally, a funnel structure is provided in the recovery tank, the edge of the funnel structure is connected to the side wall of the recovery tank, and the funnel structure is used to gather the sand-water mixture after solid-liquid separation.

[0020] Optionally, the sand and gravel separation component further includes: a linear screen device; the linear screen device is arranged at the tail of the sand and gravel separation component for docking with the sand and gravel conveyor belt.

[0021] In a second aspect, the present invention further provides a method for producing quartz fracturing sand, based on the quartz fracturing sand production system as described in the first aspect, the method for producing quartz fracturing sand comprises:

[0022] Control the ore washer to clean and filter the raw sand;

[0023] Recover the filtered raw sand;

[0024] Control the cyclone device to separate the raw sand into solid and liquid, so that the separated sand-water mixture flows back to the recovery tank;

[0025] Control the dewatering screen device to dewater the sand and gravel after solid-liquid separation;

[0026] The scrubbing device is controlled to scrub the dehydrated sand and gravel to meet the sphericity requirement of the quartz fracturing sand.

[0027] The beneficial technical effects of the present invention are:

[0028] The quartz fracturing sand production system and production method disclosed in the present invention provide a pressure pump to pump the raw sand in the grit chamber to a cyclone device, and the cyclone device can realize solid-liquid separation of the fluid raw material. Compared with conventional spiral and water wheel solid-liquid separation devices, the solid-liquid separation effect is better, and the excess water after separation in the cyclone device is concentrated and returned to the recovery tank through the second pipeline. Since a small amount of sand and gravel are mixed in the returned water, this part of the sand and gravel is transported to the grit chamber for circulation after recovery and precipitation, so that the sand and gravel raw materials can be recycled and utilized, and the waste of sand and gravel caused by directly discharging the liquid after solid-liquid separation is avoided, thereby saving costs; and the number of stages and the scrubbing time of the scrubbing device are determined according to the sphericity of the quartz fracturing sand, which can more accurately meet the production requirements, is conducive to improving the process quality, and has high production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of a quartz fracturing sand production system provided by an embodiment of the present invention;

[0030] Figure 2 is a structural schematic diagram of another quartz fracturing sand production system provided by an embodiment of the present invention;

[0031] Figure 3 It is a flow chart of a method for producing quartz fracturing sand provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as herein.

[0034] Those skilled in the art will appreciate that, unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0035] like Figure 1 and Figure 2 As shown, the present invention discloses a quartz fracturing sand production system, including: a ore washer 100, a screening device 200, a sand settling tank 300, at least one set of sand and gravel separation components 600 and a recovery tank 800.

[0036] Specifically, the ore washer 100 is used to wash raw sand, which is the raw material for producing quartz fracturing sand. The screening device 200 is connected to the ore washer 100, or it can be understood that the inlet of the screening device 200 is connected to the sand outlet of the ore washer 100, and the screening device 200 is used to filter the raw sand after being washed by the ore washer 100, and some impurities are filtered out to further improve the cleanliness of the raw sand.

[0037] The grit chamber 300 is located below the ground and is used to collect the raw sand filtered by the screening device 200. The raw sand in the grit chamber 300 is a mixture of sand and water. Since the raw sand is in a fluid state after meeting water, the pressure pump 400 is used to drain the raw sand into the sand and gravel separation assembly 600 for solid-liquid separation, and the separated sand and gravel are dehydrated, screened, scrubbed and polished to obtain quartz fracturing sand that meets the requirements.

[0038] Considering the actual installation site of the fracturing sand production system, the sand and gravel separation assembly 600 in the embodiment of the present invention can be set as one or more groups (two or more groups). For each group of sand and gravel separation assembly 600, the sand and gravel separation assembly 600 specifically includes: a cyclone device, a dewatering screen device 620 and a scrubbing device 630 arranged in sequence. The side of the cyclone device is connected to the sand settling tank 300 through a first pipeline 500. A pressure pump 400 is arranged on the first pipeline 500 to pump the raw sand in the sand settling tank 300 to the cyclone device. The cyclone device can realize solid-liquid separation of the raw sand through high-speed rotation, and the separated sand and gravel enter the dewatering screen device 620 for dehydration. It can be understood that for different groups of sand and gravel separation components 600, when the entire quartz fracturing sand system is arranged in parallel, each group of cyclone devices is connected to the sand settling tank 300 through the first pipeline 500, and when the entire quartz fracturing sand system is arranged in series, adjacent quartz fracturing sands are connected first, which is conducive to saving equipment installation space.

[0039] The recovery tank 800 is connected to the top of the cyclone device through the second pipeline 700 to recover the sand-water mixture after solid-liquid separation. The recovery tank 800 is connected to the grit tank 300, so that the excess fluid (water mixed with a small amount of sand and gravel) generated by the solid-liquid separation in the cyclone device overflows to the recovery tank 800, and then flows back to the grit tank from the recovery tank 800. Under the action of the pressure pump 400, the solid-liquid separation is performed again with the raw sand for circulation, thereby avoiding the waste of sand and gravel and saving costs.

[0040] Furthermore, the scrubbing device 630 includes a multi-stage scrubbing mechanism, and the number of stages and scrubbing time required by the scrubbing mechanism are determined according to the sphericity of the quartz fracturing sand. The sphericity is used to indicate the quality of the quartz fracturing sand. The higher the sphericity, the better the quality of the sand and the lower the sphericity, the worse the quality of the sand and the gravel. The scrubbing device 630 can wipe off the coating on the surface of the sand and gravel, reduce turbidity, and improve the quality of the sand and gravel.

[0041] The fracturing sand production system provided by the embodiment of the present invention is equipped with a pressure pump 400 to pump the raw sand in the grit tank 300 to the cyclone device. The cyclone device can realize solid-liquid separation of the fluid raw material. Compared with the conventional spiral and water wheel solid-liquid separation devices, the solid-liquid separation effect is better. The excess water after separation in the cyclone device is concentrated and returned to the recovery tank 800 through the second pipeline 700. Since a small amount of sand and gravel are mixed in the returned water, this part of the sand and gravel is transported to the grit tank 300 for circulation after recovery and precipitation. In this way, the sand and gravel raw materials can be recycled and utilized, avoiding the waste of sand and gravel caused by directly discharging the liquid after solid-liquid separation, thereby saving costs. The number of stages and scrubbing time of the scrubbing device are determined according to the sphericity of the quartz fracturing sand, which can more accurately meet the production requirements, is conducive to improving the process quality, and has high production efficiency.

[0042] In some embodiments, considering the limitations of some installation scenarios, such as Figure 2 As shown, the sand and gravel separation assembly 600 is at least two groups ( Figure 2 The sand and gravel separation components 600 of each group are arranged side by side at intervals. Figure 2 The sand and gravel separation components 600 shown in the figure are in a parallel state. The cyclone devices of each group of the sand and gravel separation components 600 are respectively connected to the sand settling tank 300 through the first pipeline 500. The first pipeline 500 is provided with a pressure pump 400 for pumping the raw sand in the sand settling tank 300 into the sand and gravel separation component 600 for solid-liquid separation.

[0043] In some embodiments, there are multiple groups of the dewatering screen device 620 and the scrubbing device 630 in each group of the sand and gravel separation assembly 600, and the dewatering screen device 620 and the scrubbing device 630 are arranged alternately, that is, multiple rounds of dewatering and scrubbing can be performed, which is beneficial to further improve the quality of the fracturing sand.

[0044] In some embodiments, the dewatering screen device 620 includes a primary dewatering mechanism 610 and a secondary dewatering mechanism 620 which are sequentially arranged. The primary dewatering mechanism 610 is used to perform primary dewatering on the sand and gravel; the secondary dewatering mechanism 620 includes a spraying structure, and the spraying component is used to spray clean water when the sand and gravel are dewatered, so that the sand can be demudged more thoroughly through multi-stage dewatering, and the muddy water and dust carried by the sand itself can be taken away by spraying clean water to ensure the turbidity of the finished fracturing sand.

[0045] In some embodiments, in each group of the sand and gravel separation assembly 600, a support frame is provided at the bottom of the cyclone device, the dewatering screen device 620 and the scrubbing device 630, and the height of the support frame decreases in sequence according to the transmission direction of the sand and gravel, so as to facilitate the rapid transportation of sand and gravel between different devices.

[0046] In some embodiments, the quartz fracturing sand production system further includes: a water tank; the water tank is connected to the drain outlets of the dewatering screen device 620 through a manifold, respectively, to collect excess water after dehydration.

[0047] In some embodiments, a funnel structure 810 is disposed in the recovery tank 800 , and the edge of the funnel structure 810 is connected to the side wall of the recovery tank 800 . The funnel structure 810 is used to gather the sand-water mixture after solid-liquid separation.

[0048] Optionally, the sand and gravel separation assembly 600 further includes: a linear screen device 640; the linear screen device 640 is arranged at the rear of the sand and gravel separation assembly 600, and is used to connect with the sand and gravel conveyor belt. The linear screen device 640 simultaneously screens the sand and gravel during the sand and gravel conveying process, thereby filtering out the sand and gravel or impurities that do not meet the requirements, and improving the quality of the final quartz fracturing sand.

[0049] Based on the same inventive concept, Figure 3 As shown, an embodiment of the present invention further provides a quartz fracturing sand production method. Based on the quartz fracturing sand production system in the above embodiment, the quartz fracturing sand production method includes:

[0050] S100, controlling the ore washer 100 to wash and filter the raw sand.

[0051] S200, controlling the filtered raw sand to be recovered to the sand settling tank 300.

[0052] S300, controlling the cyclone device to perform solid-liquid separation on the raw sand, so that the separated sand-water mixture flows back to the recovery tank 800.

[0053] S400, controlling the dewatering screen device 620 to dewater the sand and gravel after solid-liquid separation.

[0054] S500, controlling the scrubbing device 630 to scrub the dehydrated sand and gravel to meet the sphericity requirement of the quartz fracturing sand.

[0055] It should be noted that the steps in the embodiments of the present invention are based on the production system in the aforementioned embodiments, and the specific working principle of the production system will not be repeated here.

[0056] The fracturing sand production method provided in the embodiment of the present invention, by pumping the raw sand in the grit tank 300 to the cyclone device, the fluid raw material can be separated into solid and liquid through the cyclone device. Compared with the conventional spiral and water wheel type solid-liquid separation devices, the solid-liquid separation effect is better, and the excess water after solid-liquid separation is concentrated and returned to the recovery tank 800. Since a small amount of sand and gravel are mixed in the returned water, this part of the sand and gravel is transported to the grit tank 300 for circulation after recovery and precipitation. In this way, the sand and gravel raw materials can be recycled, and the direct discharge of the liquid after solid-liquid separation, which leads to the waste of sand and gravel, can be avoided, thereby saving costs.

[0057] The above is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments. It is understood that other improvements and changes directly derived or associated by those skilled in the art without departing from the spirit and concept of the present invention should be considered to be included in the protection scope of the present invention.

Claims

1. A quartz fracturing sand production system, characterized in that: include: Ore washing machine, used to wash the raw sand; A screening device, the screening device is connected to the ore washer and is used to filter the washed raw sand; A grit chamber, the grit chamber being located below the ground and used to collect the raw sand filtered by the screening device; At least one group of sand and gravel separation components, the sand and gravel separation components include a cyclone device, a dewatering screen device and a scrubbing device arranged in sequence, the side of the cyclone device is connected to the sand settling tank through a first pipeline, the first pipeline is provided with a pressure pump for pumping the raw sand in the sand settling tank to the cyclone device, the cyclone device is used to perform solid-liquid separation on the raw sand, and the separated sand and gravel enter the dewatering screen device for dehydration; the scrubbing device includes a multi-stage scrubbing mechanism, the number of stages and scrubbing time required by the scrubbing mechanism are determined according to the sphericity of the quartz fracturing sand; A recovery tank is connected to the top of the cyclone device through a second pipeline, and recovers the sand-water mixture after solid-liquid separation. The recovery tank is connected to the grit tank.

2. The quartz fracturing sand production system according to claim 1, characterized in that: The sand and gravel separation components are at least two groups, and the sand and gravel separation components in each group are arranged side by side with an interval.

3. The quartz fracturing sand production system according to claim 2, characterized in that: There are multiple groups of the dewatering screen devices and the scrubbing devices in each group of the sand and gravel separation components, and the dewatering screen devices and the scrubbing devices are arranged alternately.

4. The quartz fracturing sand production system according to claim 3, characterized in that: The dewatering screen device comprises a primary dewatering mechanism and a secondary dewatering mechanism which are arranged in sequence; The primary dehydration mechanism is used to perform primary dehydration on the sand and gravel; The secondary dehydration mechanism comprises a spraying structure, and the spraying component is used for spraying water mist when the sand and gravel are dehydrated.

5. The quartz fracturing sand production system according to claim 3, characterized in that: In each group of the sand and gravel separation components, a support frame is provided at the bottom of the cyclone device, the dewatering screen device and the scrubbing device, and the height of the support frame decreases in sequence according to the transmission direction of the sand and gravel.

6. The quartz fracturing sand production system according to claim 1, characterized in that: Also includes: Water tank; The water tank is connected to the drain outlet of the dewatering screen device through a conduit, and is used to collect excess water after dehydration.

7. The quartz fracturing sand production system according to claim 1, characterized in that: A funnel structure is arranged in the recovery tank, the edge of the funnel structure is connected to the side wall of the recovery tank, and the funnel structure is used to gather the sand-water mixture after solid-liquid separation.

8. The quartz fracturing sand production system according to claim 1, characterized in that: The sand and gravel separation component also includes: a linear screen device; the linear screen device is arranged at the tail of the sand and gravel separation component and is used for docking with the sand and gravel conveyor belt.

9. A method for producing quartz fracturing sand, characterized in that: Based on the quartz fracturing sand production system according to any one of claims 1 to 8, the quartz fracturing sand production method comprises: Control the ore washer to clean and filter the raw sand; The filtered raw sand is recovered to the sand settling tank; Control the cyclone device to separate the raw sand into solid and liquid, so that the separated sand-water mixture flows back to the recovery tank; Control the dewatering screen device to dewater the sand and gravel after solid-liquid separation; The scrubbing device is controlled to scrub the dehydrated sand and gravel to meet the sphericity requirements of the quartz fracturing sand.

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