Subdivision self-unloading sand transporting ship, sand transporting system and cross-ship sand transporting method

Abstract

The invention discloses a subdivision self-discharging sand transporting ship, a sand transporting system and a ship-crossing sand transporting method. The subdivision self-unloading sand transporting ship and sand transporting system comprises a sand transporting ship and a continuous ship-crossing self-unloading system. In the longitudinal direction, a cargo hold of the sand carrier comprises a plurality of independent sand storage cabins; the continuous ship-crossing self-discharging system comprises a cabin bottom conveying belt, a lifting conveyor and a folding feeding arm. The cabin bottom conveying belt is located at the bottom of the sand storage cabin and receives sand flowing out through the remote control valve. The head end of the lifting conveyor is connected with a cabin bottom conveying belt, and the tail end extends to a deck; the folding feeding arm comprises a base, a power conveying pipe, a guide pipe and a flexible pipe; and a rotary hopper is arranged on the base and is used for receiving sand output by the lifting conveyor. According to the method, continuity and high efficiency of sand conveying and supplying are guaranteed, the time for the fracturing ship to return to a wharf to supply the propping agent is saved, sand on different sand storage cabins on the sand conveying ship can enter a ship-crossing self-discharging system in a controlled mode, and certain automatic sand conveying capacity is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of self-unloading sand transport ship and sand transport system and cross-ship sand transport method, belong to offshore oil and gas exploitation field. BACKGROUND

[0002] In offshore oilfield fracturing operation, timely supply of proppant is crucial. Due to the limitation of tank capacity, the proppant carried by offshore fracturing ship cannot support continuous large-scale fracturing operation, and the problem of proppant supply must be considered. In the current scheme, ton bag hoisting at the operation site or fracturing ship returning to the wharf for supply is adopted. Such method not only consumes a lot of time and affects the continuity of fracturing operation, but also increases labor and fuel costs, directly affecting the efficiency and progress of fracturing operation.

[0003] Currently, sand transport ship is used to supply proppant to fracturing ship in time. However, the existing sand transport ship and sand transport system mainly have the following problems: traditional sand transport ship generally adopts single cargo tank design, which cannot realize classification storage and transportation of proppants with different particle sizes, leading to mixing during loading and unloading and affecting sanding effect; the existing sand transport system has low automation degree, and fixed belt conveyor or screw conveyor is mostly used. Such low-efficiency and dangerous mode significantly increases safety hazards and operation cost, and cannot meet the needs of different operation environments, and the lack of flexibility restricts the improvement of overall efficiency. The existing equipment is prone to wear and failure during long-term use, and has high maintenance frequency and cost, and the reliability of the equipment affects the overall operation efficiency. These problems highlight the technical limitations of traditional sand transport ship and sand transport system in adapting to the needs of modern offshore oilfield fracturing operation. SUMMARY

[0004] The purpose of the present application is to provide a kind of self-unloading sand transport ship and sand transport system and cross-ship sand transport method, which realizes efficient classification storage, offshore transportation and cross-ship supply of proppant through the design of compartmentalized ship structure, continuous cross-ship self-unloading system and folding feeding arm.

[0005] In the present application, different particle sizes of sand can be stored in different compartments and accurately fed in sequence, avoiding mixing. The whole process is closed, continuous and automated, reducing manual cleaning of the hold and improving unloading efficiency and operation safety. The folding feeding arm can rotate, stretch and sway with the ship to compensate for displacement, adapt to different ship distances and working conditions, and realize efficient and stable sand transport between two ships.

[0006] Specifically, the self-unloading sand transport ship and sand transport system provided by the present application comprises a sand transport ship and a continuous cross-ship self-unloading system. In the longitudinal direction, the cargo hold of the sand transport ship comprises a plurality of independent sand storage compartments, each of which is used to store sand with different particle sizes, and the bottom of each sand storage compartment is provided with a remotely controlled valve. The continuous cross-ship self-unloading system comprises a bottom conveyor belt, a lifting conveyor and a folding feeding arm, can realize efficient and continuous sand conveying, and reduces the need for manual intervention. The bottom conveyor belt is located at the bottom of the sand storage cabin and receives the sand flowing out through the remote control valve. The lifting conveyor is connected to the bottom conveyor belt at the first end and extends to the deck at the tail end. The folding feeding arm comprises a base mounted on the deck, a power conveying pipe, a guide pipe and a flexible pipe. The base is provided with a rotary hopper which receives the sand output by the lifting conveyor and sequentially conveys the sand to the fracturing ship through the power conveying pipe, the guide pipe and the flexible pipe.

[0007] In the present application, under the premise of meeting the basic functional requirements (such as fresh water supply, oil storage, personnel isolation, etc.), other cabins except the necessary functional cabins are designed as sand storage cabins. The main purpose of each sand storage cabin is to load proppants, and by arranging multiple independent sand storage cabins, the classification storage of proppants of different particle sizes or types can be realized. These sand storage cabins are effectively separated by horizontal partitions.

[0008] In the present application, the folding feeding arm adopts a closed tubular structure, has the ability to flexibly adapt to different working environments, and is connected to the sand hatch of the fracturing ship through a flexible tail end, ensuring stable work in complex sea conditions.

[0009] Preferably, the bottom of the sand storage cabin is V-shaped in cross section, ensuring the flowability of the sand. The remote control valve is an electrically or hydraulically controlled valve, and the opening degree thereof is adjusted in real time through a remote control system to control the unloading flow of the sand.

[0010] Preferably, the bottom conveyor belt is longitudinally laid at the lowest point of the V-shaped bottom of the sand storage cabin, maximally utilizes gravity to guide the proppants, and is directly connected to the remote control valve at the bottom of each cabin. When the valve is opened, the proppants directly fall onto the surface of the bottom conveyor belt. The bottom conveyor belt receives the proppants automatically gathered from the V-shaped bottom of each sand storage cabin by gravity, forms the starting transfer point of the sand conveying system, seamlessly transfers the proppants to the lifting conveyor, ensures the continuity of the cross-ship sand conveying process, avoids the interruption of manual transportation, and realizes the classified conveying of proppants of different particle sizes (avoiding mixing) through the control of the partition valve in the independent cabin.

[0011] Preferably, the lifting conveyor is a vertical bucket elevator or a vertical screw elevator, and the outlet thereof is located above the deck and directly connected to the rotary.

[0012] The lifting conveyor vertically or obliquely lifts the sand conveyed from the bottom conveyor belt to the deck height of the sand conveying ship, and continuously and stably feeds the sand into the hopper of the folding feeding arm, so that the closed transfer from low to high is realized, and the uninterrupted operation of the whole cross-ship self-unloading system is ensured.

[0013] Preferably, the power conveying pipe is articulated by at least two pipe sections, and a spiral conveying rod connected by a universal joint is arranged in the pipe section, and the spiral conveying rod is driven by a power device mounted on the base.

[0014] More preferably, the power conveying pipe comprises at least a first pipe section and a second pipe section, the first pipe section is articulated with the base, and the second pipe section is connected with the first pipe section through an articulated joint, so that the power conveying pipe can be folded and retracted onto the deck.

[0015] The forced rotation of the spiral conveying rod inside the power conveying pipe positively pushes the proppant in the hopper to the guide pipe, solves the problem of easy blockage in pure gravity conveying, and is especially suitable for horizontal or small-inclination pipe sections. The power conveying pipe serves as the core power section of the folding feeding arm, receives the proppant transferred by the lifting conveyor, and spans the gap between the sand conveying ship and the fracturing ship, so that the spatial transfer of the proppant is realized. Through the design of the two articulated pipe sections, the conveying pipe can be bent and adjusted in angle in three-dimensional space, and the relative displacement of the two ships and the sea condition swaying are adapted.

[0016] Preferably, the guide pipe is a hard hollow blind pipe, one end of which is articulated with the power conveying pipe, and the other end is connected with the flexible pipe. The end of the flexible pipe can be fixed to the sand hatch of the fracturing ship, and is used for feeding the sand to the sand hatch of the fracturing ship. The flexible pipe is a wear-resistant rubber hose or a polyurethane hose, and a quick connection joint is arranged at the end of the flexible pipe, which is used for quick fixing to the sand hatch of the fracturing ship. A sealing structure is arranged at the connection between the guide pipe and the flexible pipe, so as to prevent sand leakage.

[0017] In the application, the guide pipe serves as a hard hollow blind pipe (without power structure), receives the proppant pushed by the power conveying pipe, and utilizes the inclination angle to make the proppant slide at high speed under the action of gravity, so as to improve the conveying efficiency. The guide pipe restricts the movement track of the proppant through the rigid pipe body, avoids the splashing or deviation of the proppant due to the swaying of the ship body during cross-ship conveying, and ensures that the proppant is 100% conveyed to the inlet of the flexible pipe. One end of the guide pipe is flexibly connected with the power conveying pipe through an articulated joint, and the other end is flange-sealed to the flexible pipe, so as to resolve the mechanical stress of the rigid-flexible transition.

[0018] On the basis of the compartment self-unloading sand conveying ship and the sand conveying system, the application further provides a cross-ship sand conveying method, comprising the following steps: S1, different particle size proppants are classified and loaded into the sand storage cabin; S2, after the sand ship and the fracturing ship are parked side by side, the flexible pipe at the end of the folding feeding arm is fixed at the sand cabin opening of the fracturing ship under the assistance of the crane; the remote control valve of the target cabin is opened, and the proppants flow into the bottom conveyor belt through the bottom; S3, the proppants are conveyed to the rotary hopper of the folding feeding arm through the lifting conveyor; S4, the sand is pushed to the guide pipe through the power conveying pipe, and is injected into the sand cabin opening of the fracturing ship through the flexible pipe.

[0019] In step S2, the quantitative mixed conveying of different particle size proppants is realized by independently adjusting the opening degree of the remote control valve of each cabin.

[0020] In step S2, the folding feeding arm is unfolded after the sand ship and the fracturing ship are parked side by side, and the guide pipe and the flexible pipe are adjusted in space posture through the hinged joint under the assistance of the crane, so that the end of the flexible pipe is aligned with the sand cabin opening of the fracturing ship.

[0021] When the sand cabin opening of the fracturing ship is far from the side, a conveying belt device can be additionally arranged on the fracturing ship, the sand is unloaded to the conveying belt by the folding feeding arm, and then is transferred to the sand cabin of the fracturing ship by the conveying belt.

[0022] The sand conveying method of the present application combines the double-ship parking method, the remote control valve and the automatic conveying equipment to realize efficient unloading, meet the sand conveying needs in offshore fracturing operation, significantly improve the loading and unloading efficiency, reduce the safety risk of the operator, and have good environmental adaptability and practical application value.

[0023] The sand ship of the present application loads a large amount of proppants according to the needs of offshore large-scale fracturing from the wharf to the fracturing ship, and can realize one-time loading of a large amount of proppants, loading of proppants of different material types and different particle sizes. The sand ship has a certain degree of automation, and has a built-in sand storage cabin, a bottom conveyor belt, an automatic control switch and a sand sweeping system in the ship body, and can realize fully automatic sand conveying control and monitoring.

[0024] The application connects the sand-carrying ship and the fracturing ship by the continuous cross-ship self-unloading system, the lifting conveyor is connected with the bottom sand-carrying belt of the sand-carrying ship through the connecting joint, the fracturing proppant is controlled to enter the bottom conveyor belt from the sand storage cabin of the sand-carrying ship through the automatic control switch, and then is conveyed to the connecting joint at the stern of the ship, and then is transmitted to the lifting conveyor, the lifting conveyor is transmitted to the hopper above the folding feeding arm base, and then is transmitted to the power conveying pipe, the spiral conveying rod transmits the proppant in the power conveying pipe to the guide pipe, and the proppant is lowered to the hose in the guide pipe by gravity, so that the proppant is finally conveyed to the sand cabin of the fracturing ship. The continuous cross-ship self-unloading system guarantees the continuity and high efficiency of sand supply, saves the time of the fracturing ship returning to the wharf for proppant supply, and the sand in different sand storage cabins on the sand-carrying ship can be controlled to enter the cross-ship self-unloading system, and the sand has a certain automatic sand conveying capacity, so that the operation efficiency is greatly improved, and the operation cost and operation risk are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is the structural schematic diagram of the cabin self-unloading sand-carrying ship and sand conveying system of the application.

[0026] Figure 2 is the flow chart of the cross-ship sand conveying method of the application. DETAILED DESCRIPTION

[0027] The experimental methods used in the following examples are conventional methods unless otherwise specified.

[0028] The materials, reagents and the like used in the following examples can be obtained from commercial channels unless otherwise specified.

[0029] Figure 1 is the structural schematic diagram (side view cross-sectional view) of the cabin self-unloading sand-carrying ship and sand conveying system adopted by the application, including the sand-carrying ship and the continuous cross-ship self-unloading system; along the longitudinal direction, the cargo cabin of the sand-carrying ship includes a plurality of independent sand storage cabins 1, each sand storage cabin 1 is used for storing sand of different particle sizes, the bottom of the sand storage cabin 1 is in V-shaped cross section, and the sand flowability is ensured; the bottom of the sand storage cabin 1 is provided with a remote control valve 2, which can be an electric control valve or a liquid control valve, and the opening degree thereof is adjusted in real time through a remote control system to control the unloading flow of the sand.

[0030] As Figure 1As shown, the continuous cross-ship self-unloading system of the present application comprises a bottom conveyor belt 3, a lifting conveyor 4 and a folding feeding arm, which can realize efficient and continuous sand conveying and reduce the need for manual intervention. Specifically, the bottom conveyor belt 3 is located at the bottom of the sand storage cabin 1 and receives the sand flowing out through the remotely controlled valve 2; the lifting conveyor 4 has a first end connected to the bottom conveyor belt 3 and a last end extending to the deck; the folding feeding arm comprises a base 5 mounted on the deck, a power conveying pipe 6, a guide pipe 8 and a flexible pipe 9, and the base 5 is provided with a rotary hopper 7 which receives the sand output by the lifting conveyor 4 and sequentially conveys the sand to the fracturing ship through the power conveying pipe 6, the guide pipe 8 and the flexible pipe 9. The lifting conveyor 4 is a vertical bucket elevator or a vertical screw elevator, and its outlet is located above the deck and directly interfaces with the rotary hopper 7. The lifting conveyor 4 vertically or obliquely lifts the sand conveyed from the bottom conveyor belt 3 to the height of the sand conveying ship deck and continuously and stably feeds the sand into the hopper of the folding feeding arm, realizing closed transfer from low to high and ensuring uninterrupted operation of the entire cross-ship self-unloading system. The power conveying pipe 6 comprises a first pipe section and a second pipe section, the first pipe section is hinged to the base 5, and the second pipe section is connected to the first pipe section through a hinged joint, so that the power conveying pipe 6 can be folded back to the deck; the first pipe section and the second pipe section are provided with screw conveying rods connected through universal joints, and the screw conveying rods are driven by a power device mounted on the base 5. Through the forced rotation of the screw conveying rods inside the power conveying pipe 6, the proppant in the hopper is pushed forward to the guide pipe 8, solving the problem of easy blockage in pure gravity conveying, and being especially suitable for horizontal or small-inclination pipe sections. The power conveying pipe 6, as the core power section of the folding feeding arm, receives the proppant transferred by the lifting conveyor 4 and spans the gap between the sand conveying ship and the fracturing ship, realizing spatial transfer of the proppant. Through the design of the two hinged pipe sections, the conveying pipe is allowed to bend and adjust the angle in three-dimensional space, adapting to the relative displacement of the two ships and the sea condition sway. The guide pipe 8 is a hard hollow blind pipe, one end of which is hinged to the power conveying pipe 6 and the other end of which is connected to the flexible pipe 9; the last end of the flexible pipe 9 can be fixed to the fracturing ship sand hatch 10 for feeding the sand to the fracturing ship sand cabin; the flexible pipe 9 is a wear-resistant rubber hose or a polyurethane hose, and its last end is provided with a quick connection joint for quick fixing to the fracturing ship sand hatch; the guide pipe 8 and the flexible pipe 9 are provided with a sealing structure at the connection position to prevent sand leakage.

[0031] In the present application, the folding feeding arm adopts a closed tubular structure, has the ability to flexibly adapt to different working environments, and is connected to the fracturing ship sand hatch 10 through a flexible end, ensuring stable work in complex sea conditions.

[0032] In the application, the bottom conveying belt 3 is longitudinally laid on the V-shaped bottom of the sand storage cabin 1, the gravity diversion proppant is maximally utilized, and the bottom conveying belt 3 is directly connected with the remote control valve 2 at the bottom of each cabin, and the proppant directly falls on the surface of the bottom conveying belt 3 after the valve is opened. The bottom conveying belt 3 receives the proppant automatically gathered from the V-shaped bottom of each sand storage cabin by gravity, forms the starting transfer point of the sand conveying system, seamlessly transfers the proppant to the lifting conveyor 4, ensures the continuity of the cross-ship sand conveying process, avoids the interruption of manual transportation, cooperates with the independent cabin design, controls through the cabin valve, realizes the classified conveying of proppants with different particle sizes (avoiding mixing).

[0033] In the application, the guide pipe 8 is a hard hollow blind pipe (without power structure), receives the proppant pushed by the power conveying pipe 6, utilizes the inclination angle to make the proppant slide at high speed under the action of gravity, and improves the conveying efficiency. The guide pipe 8 restricts the movement track of the proppant through the rigid pipe body, avoids the splashing or deviation of the proppant in the cross-ship conveying process due to the shaking of the ship body, and ensures that the proppant is 100% conveyed to the inlet of the flexible pipe 9. One end of the guide pipe 8 is flexibly connected with the power conveying pipe 6 through the hinged joint, and the other end is connected with the flexible pipe 9 through the flange sealing structure, and the mechanical stress of the rigid-flexible transition is resolved.

[0034] As shown in Figure 2 , it is a flow chart of the cross-ship sand conveying method using the sand conveying ship and the sand conveying system of the application: S1: The sand conveying ship loads the proppant at the wharf First, when loading the proppant at the wharf, as shown in Figure 1 , the sand conveying ship of the application adopts modular design, and different numbers of proppant storage and conveying cabins can be arranged below the deck according to actual needs.

[0035] When loading the proppant, first open the sand storage cabin cover plate, use the wharf special proppant hoisting or sand conveying equipment to convey the proppant to each sand storage cabin 1 as needed. According to the characteristics of the site demand, the application suggests adopting the “rear priority” loading principle: that is, the proppant with large demand and high frequency of use is preferentially loaded in the sand storage cabin at the rear of the ship body; and the proppant with small demand and low frequency of use is loaded in the sand storage cabin at the front of the ship body. In the specific operation process, the flexible sand conveying pipe can be hung on the wharf crane to accurately convey the bulk proppant in the onshore storage and conveying equipment to each sand storage cabin. In the whole loading process, the safety and stability of the transportation process need to be considered comprehensively according to the ship loading balance and the ship body bearing structure requirements, to ensure the safety and stability of the transportation process. Through the scientific and reasonable loading scheme design, the loading and unloading efficiency can be improved, and the transportation risk can be effectively reduced, to ensure the safety of the goods transportation.

[0036] S2: The sand conveying ship transports the proppant to the fracturing ship After loading is completed at the dock, the sand storage tank cover is installed. The proppant is then transported from the dock to the fracturing vessel by the power of the sand transport ship. During this process, it is necessary to ensure the airtightness of the sand storage tank cover to prevent waves from wetting the proppant inside the tank during transportation.

[0037] S3: Adjust the attitude of the sand transport vessel so that the two vessels are moored side by side. After anchoring and fixing the position of the transport vessel, debug the continuous cross-ship self-unloading system.

[0038] This process utilizes the connection between the bilge conveyor 3 and the hoisting conveyor 4, which in turn connects to the folding feeding arm to deliver the proppant to the fracturing vessel's sand hatch 10. Specifically, a rotating hopper 9 is installed on the folding feeding arm to receive the sand unloaded from the hoisting conveyor and then transmit it to the power delivery pipe. The power unit on the base 5 is connected to the power delivery pipe 6, providing rotational power to its conveying rod.

[0039] S4: Control the sand conveying system according to the supplementary quantity, and transport the proppant from each compartment to the hatch of the fracturing vessel. As mentioned earlier, the proppant is transported from inside the transport ship by the bilge conveyor belt 3 to the hoisting conveyor 4, and then by the hoisting conveyor 4 into the rotating hopper 7 with the folding feeding arm on the deck. The power delivery pipe 6, which works in conjunction with the rotating hopper 7, receives the proppant and, together with the guide pipe 8, performs cross-ship transport. Finally, the proppant enters the flexible pipe 9 through the guide pipe 8 and reaches the sand hatch 10 of the fracturing ship. The proppant ratio in each sand storage chamber 1 is controlled by the opening and closing of the remote control valve 2, enabling quantitative monitoring of the sand delivery volume.

[0040] S5: Sand transport by cross-ships ends, sand transport vessels depart. After the proppant is replenished, the folding feed arm is disassembled using the cranes of the fracturing vessel and the sand transport vessel. Damage inspection and maintenance of the bilge conveyor belt, hoisting conveyor and folding feed arm are carried out, and the remaining proppant is stored securely for future use.

Claims

1. A sand-transporting ship with self-unloading and a sand-transporting system, comprising a sand-transporting ship and a continuous cross-ship self-unloading system. In the longitudinal direction, the cargo hold of the sand-transporting ship comprises a plurality of independent sand storage compartments, the bottom of each sand storage compartment being provided with a remotely controlled valve. The continuous cross-ship self-unloading system comprises a bottom conveyor, a lifting conveyor and a folding feeding arm. The bottom conveyor is located at the bottom of the sand storage compartment and receives the sand flowing out of the remotely controlled valve. The lifting conveyor is connected to the bottom conveyor at the front end and extends to the deck at the rear end. The folding feeding arm comprises a base mounted on the deck, a powered conveying pipe, a guide pipe and a flexible pipe. The base is provided with a rotary hopper which receives the sand output by the lifting conveyor and sequentially conveys the sand to the fracturing ship through the powered conveying pipe, the guide pipe and the flexible pipe.

2. The self-discharging split-hulled dump barge and sand delivery system of claim 1, wherein: The bottom of the sand storage compartment has a V-shaped cross section. The remotely controlled valve is an electrically or hydraulically controlled valve, and the opening degree thereof is adjusted in real time by a remote control system to control the unloading flow of the sand.

3. The self-discharging split-hulled sand carrier and sand delivery system of claim 1 or 2, wherein: The lifting conveyor is a vertical bucket elevator or a vertical screw elevator, and the outlet thereof is located above the deck and directly connected to the rotary hopper.

4. The self-discharging split-hulled dump barge and sand delivery system of any one of claims 1-3, wherein: The powered conveying pipe is formed by hingedly connecting at least two pipe sections, and a screw conveying rod connected by a universal joint is arranged in each pipe section, and the screw conveying rod is driven by a power device mounted on the base.

5. The self-discharging dump barge and sand delivery system of claim 4, wherein: The powered conveying pipe comprises at least a first pipe section and a second pipe section, the first pipe section is hingedly connected to the base, and the second pipe section is connected to the first pipe section through a hinged joint, so that the powered conveying pipe can be folded and retracted onto the deck.

6. The self-discharging split-hulled dump barge and sand delivery system of any one of claims 1-5, wherein: The guide pipe is a hard hollow blind pipe, one end of which is hingedly connected to the powered conveying pipe, and the other end is connected to the flexible pipe. The end of the flexible pipe can be fixed to the sand loading port of the fracturing ship to deliver the sand to the sand compartment of the fracturing ship.

7. The self-discharging dump barge and sand delivery system of claim 6, wherein: The flexible pipe is a wear-resistant rubber hose or a polyurethane hose, and the end thereof is provided with a quick connection joint for quick fixing to the sand loading port of the fracturing ship. The connection between the guide pipe and the flexible pipe is provided with a sealing structure to prevent sand leakage. 8.A cross-ship sand-transporting method based on the sand-transporting ship with self-unloading according to any one of claims 1-7, comprising the following steps: S1.classifying and loading different particle sizes of proppants into the sand storage compartments; S2.after the sand-transporting ship and the fracturing ship are parked side by side, the remotely controlled valve of the target compartment is opened, and the proppants flow into the bottom conveyor; S3.the proppants are conveyed to the rotary hopper of the folding feeding arm through the lifting conveyor; S4.the sand is pushed to the guide pipe through the powered conveying pipe, and is injected into the sand loading port of the fracturing ship through the flexible pipe by gravity.

9. The cross-ship sand transport method of claim 8, wherein: In step S2, the opening degree of the remotely controlled valve of each compartment is independently adjusted to realize quantitative mixing and conveying of different particle sizes of proppants.

10. A cross-ship sand transport method according to claim 8 or 9, characterised in that: In step S2, after the sand-transporting ship and the fracturing ship are parked side by side, the folding feeding arm is unfolded, and the guide pipe and the flexible pipe are adjusted in space posture through the hinged joint to align the end of the flexible pipe with the sand loading port of the fracturing ship.

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