Fracturing sand mulling equipment and pump injection equipment linkage operation method and device for oil field fracturing operation

Abstract

The invention relates to the technical field of oil field fracturing operation control, in particular to a fracturing sand mulling equipment and pump injection equipment linkage operation method and device for oil field fracturing operation, and the method comprises the steps that the real-time stirring tank liquid level of sand mulling equipment and the real-time suction pressure of fracturing pump injection equipment are monitored in real time; when the liquid level of a real-time stirring tank of the sand mixing equipment exceeds a liquid level safety threshold value, a tank overflowing prevention safety mechanism is triggered, and linkage operation is executed according to tank overflowing prevention safety conditions; and when the real-time suction pressure of the fracturing pumping equipment is smaller than the suction pressure safety threshold value, an evacuation prevention safety mechanism is triggered, and linkage operation is executed according to evacuation prevention safety conditions. Linkage control of the sand mulling equipment and the fracturing pump injection equipment is achieved based on multi-stage protection and linkage logic, the phenomena of tank overflowing and evacuation are reduced, then the influence of abnormal conditions on construction operation is effectively reduced, the safety, stability and efficiency of the construction operation are improved, and therefore the purpose of optimizing oil field fracturing operation is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil field fracturing operation control, and is a fracturing sand mixing device and pump injection device linkage operation method and device for oil field fracturing operation. BACKGROUND

[0002] In the field of oil field fracturing operation equipment control, the current technical status presents some significant features. The equipment control systems of the fracturing sand mixing device and the pump injection device are relatively independent, lack of collaboration, and the mutual operation collaboration of the equipment mainly relies on on-site command operation. This independent operation mode has a series of problems when facing abnormal conditions, such as when the sand mixing device is abnormal due to the operation of the fracturing pump injection device, causing the operation displacement to suddenly decrease, resulting in the sand mixing device absorbing more liquid than discharging, and further causing the fracturing liquid in the sand mixing tank to exceed the tank capacity, resulting in a "tank overflow" phenomenon. When the sand mixing device has insufficient liquid supply capacity, air enters the fracturing pump, which causes the fracturing pump to fail to work normally and needs to be stopped for emptying operation, resulting in an "emptying" phenomenon of the fracturing vehicle group. These problems seriously affect the efficiency and engineering quality of the operation.

[0003] In the prior art, the on-site command is the main device for collaborative operation during the fracturing operation construction process. Therefore, when abnormal conditions occur, the fracturing equipment lacks timely automatic response measures, which threatens the safety and stability of the fracturing operation.

[0004] In addition, due to the relative independence of the sand mixing device and the pump injection device, the influence on the operation and the environment cannot be effectively controlled. For example, when the "emptying" phenomenon occurs, the construction displacement fluctuates violently, and the operation must be stopped to re-circulate the emptying of the emptying device, thereby having a negative impact on the overall fracturing operation, and the "tank overflow" phenomenon may cause the liquid to fall to the ground, and the fracturing liquid contains a large amount of chemical raw materials, which poses a potential threat to the environment. SUMMARY

[0005] The present application provides a fracturing sand mixing device and pump injection device linkage operation method and device for oil field fracturing operation, which overcomes the shortcomings of the prior art and effectively solves the problem that the control systems of the fracturing sand mixing device and the fracturing pump injection device are relatively independent, causing the "tank overflow" phenomenon and the "emptying" phenomenon to be unable to be eliminated or reduced through linkage.

[0006] One of the technical solutions of the present application is realized by the following measures: a fracturing sand mixing device and pump injection device linkage operation method for oil field fracturing operation, comprising:

[0007] real-time monitoring of the real-time mixing tank liquid level of the sand mixing device and the real-time suction pressure of the fracturing pump injection device;

[0008] The real-time mixing tank liquid level of the sand mixing device exceeds the liquid level safety threshold, triggering a blowout prevention safety mechanism, and performing linkage operation according to the blowout prevention safety condition, wherein the blowout prevention safety mechanism is obtained by linkage monitoring of the real-time fracturing construction discharge collected by the sand mixing device and the real-time fracturing construction pressure collected by the instrument system, and adjusting the mixing tank liquid level safety threshold, the suction pump and the discharge pump speed of the sand mixing device, the sand concentration and the fracturing construction discharge;

[0009] The real-time suction pressure of the fracturing pump injection device is less than the suction pressure safety threshold, triggering a vacuum prevention safety mechanism, and performing linkage operation according to the vacuum prevention safety condition, wherein the vacuum prevention safety condition is obtained by linkage interlocking of the real-time mixing tank liquid level of the sand mixing device and the mixing tank liquid level control valve opening of the sand mixing device, and controlling the fracturing construction discharge.

[0010] The following is a further optimization or / and improvement of the above technical solutions:

[0011] The above blowout prevention safety condition includes:

[0012] When V

[0013] When V=Vm, the real-time blowout prevention safety parameter at the current time is determined, and when the blowout prevention safety parameter is not less than 0, the sand concentration is reset, and the fracturing construction discharge and the suction pump and discharge pump speed of the sand mixing device are adjusted correspondingly, wherein V is the real-time fracturing construction discharge collected by the sand mixing device, and Vm is the fracturing construction discharge safety threshold.

[0014] The above blowout prevention safety condition when V

[0015] When P

[0016] When Pm≤P

[0017] The mixing tank liquid level safety threshold of the sand mixing device=(Pm / P)*the mixing tank safety liquid level threshold of the sand mixing device that has been set;

[0018] Wherein, P is the real-time fracturing construction pressure collected by the instrument system, and Pm is the fracturing construction pressure safety threshold value;

[0019] When P≥1.2Pm, the opening of the sand mixing device liquid level control valve, the suction pump speed of the sand mixing device, and the discharge pump speed of the sand mixing device are all adjusted to 0.

[0020] The above anti-blowing tank safety condition when V=Vm specifically includes:

[0021] Determine the real-time anti-blowing tank safety parameter Q of the current time, and judge it, wherein the anti-blowing tank safety parameter is obtained by real-time derivation of the real-time fracturing construction pressure collected by the fracturing pump injection device on the time axis;

[0022] If Q<0, the fracturing construction is normal operation;

[0023] If Q≥0, it is judged whether Q≥β, and in response to yes, the sand concentration is set to 0, and the fracturing construction discharge, the suction pump speed of the sand mixing device, and the discharge pump speed of the sand mixing device are all adjusted to 0, and in response to no, the sand concentration and the fracturing construction discharge are set respectively by using the following formula:

[0024] Sand concentration = sanding safety factor α*anti-blowing tank safety parameter Q*current fracturing construction sand concentration value S;

[0025] Fracturing construction discharge = sanding safety factor α*anti-blowing tank safety parameter Q*fracturing construction discharge safety threshold value Vm.

[0026] The above anti-emptying safety condition includes:

[0027] When 70%J≤real-time mixing tank liquid level of the sand mixing device<90%J, the mixing tank liquid level control valve opening of the sand mixing device is set to 70%U, and the fracturing construction discharge is set to 70%V, wherein J is the mixing tank safety liquid level threshold value of the sand mixing device, U is the maximum safety opening value of the liquid level control valve of the sand mixing device, and V is the current fracturing construction discharge;

[0028] When 50%J≤real-time mixing tank liquid level of the sand mixing device<70%J, the mixing tank liquid level control valve opening of the sand mixing device is set to 100%U, and the fracturing construction discharge is set to 50%V, wherein J is the mixing tank safety liquid level threshold value of the sand mixing device, U is the maximum safety opening value of the liquid level control valve of the sand mixing device, and V is the current fracturing construction discharge;

[0029] When 20%J≤real-time mixing tank liquid level of the sand mixing device<50%J, the mixing tank liquid level control valve opening of the sand mixing device, the fracturing construction discharge, the suction pump speed of the sand mixing device, and the discharge pump speed of the sand mixing device are all set to 0.

[0030] The second technical solution of the present application is realized by the following measures: a fracturing sand mixing device and pump injection device linkage operation device for oil field fracturing operation, comprising:

[0031] The sand mixing device linkage operation part comprises a stirring tank liquid level monitoring unit, a liquid level control unit, and a first linkage control unit, wherein the liquid level control unit comprises a sand mixing device suction pump control module, a sand mixing device discharge pump control module, and a liquid level valve control module;

[0032] The stirring tank liquid level monitoring unit monitors the real-time stirring tank liquid level of the sand mixing device in real time;

[0033] The first linkage control unit is linked with the liquid level control unit and the fracturing pump injection device linkage operation part, and when the real-time stirring tank liquid level of the sand mixing device exceeds the liquid level safety threshold, a blowout prevention safety mechanism is triggered, and linkage operation is performed according to the blowout prevention safety condition, wherein the blowout prevention safety mechanism is obtained by linkage monitoring of the real-time fracturing construction discharge capacity collected by the sand mixing device and the real-time fracturing construction pressure collected by the instrument system, and adjusting the stirring tank liquid level safety threshold, the sand mixing device suction pump and discharge pump rotating speed, the sand concentration, and the fracturing construction discharge capacity according to different monitoring results;

[0034] The fracturing pump injection device linkage operation part comprises a suction pressure monitoring unit, a discharge capacity control unit, and a second linkage control unit;

[0035] The suction pressure monitoring unit monitors the real-time suction pressure of the fracturing pump injection device in real time;

[0036] The second linkage control unit is linked with the discharge capacity control unit and the sand mixing device linkage operation part, and when the real-time suction pressure of the fracturing pump injection device is less than the suction pressure safety threshold, a vacuum prevention safety mechanism is triggered, and linkage operation is performed according to the vacuum prevention safety condition, wherein the vacuum prevention safety condition is obtained by linkage interlocking of the real-time stirring tank liquid level of the sand mixing device and the stirring tank liquid level control valve opening degree of the sand mixing device, and controlling the fracturing construction discharge capacity.

[0037] The following is a further optimization or / and improvement of the above-mentioned technical solution of the application:

[0038] The blowout prevention safety condition in the first linkage control unit comprises:

[0039] When V < Vm, specifically comprising:

[0040] When P < Pm, the stirring tank of the current sand mixing device is in a safe state, wherein P is the real-time fracturing construction pressure collected by the instrument system, and Pm is the fracturing construction pressure safety threshold;

[0041] When Pm ≤ P < 1.2Pm, the stirring tank liquid level safety threshold of the sand mixing device is adjusted by the following formula:

[0042] The sand mixing equipment agitator tank liquid level safety threshold value = (Pm / P) * the set sand mixing equipment agitator tank safety liquid level threshold value;

[0043] Wherein, P is the real-time fracturing construction pressure collected by the instrument system, Pm is the fracturing construction pressure safety threshold value;

[0044] When P≥1.2Pm, the sand mixing equipment liquid level control valve opening, the sand mixing equipment suction pump speed, and the sand mixing equipment discharge pump speed are all adjusted to 0;

[0045] When V=Vm, specifically includes:

[0046] Determine the real-time anti-blowing safety parameter Q of the current time, and judge it, wherein the anti-blowing safety parameter is obtained by real-time derivation of the real-time fracturing construction pressure collected by the fracturing pump injection equipment on the time axis;

[0047] If Q<0, the fracturing construction is normal operation;

[0048] If Q≥0, it is judged whether Q≥β, in response to yes, the sand concentration is set to 0, and the fracturing construction discharge, the sand mixing equipment suction pump speed, and the sand mixing equipment discharge pump speed are all adjusted to 0, in response to no, the sand concentration and the fracturing construction discharge are set by using the following formula respectively;

[0049] Sand concentration = sanding safety factor α * anti-blowing safety parameter Q * current fracturing construction sand concentration value S;

[0050] Fracturing construction discharge = sanding safety factor α * anti-blowing safety parameter Q * fracturing construction discharge safety threshold value Vm.

[0051] The anti-blowing safety condition in the above-mentioned second linkage control unit includes:

[0052] When 70%J≤the real-time agitator tank liquid level of the sand mixing equipment <90%J, the agitator tank liquid level control valve opening of the sand mixing equipment is set to 70%U, and the fracturing construction discharge is set to 70%V, wherein J is the agitator tank safety liquid level threshold value of the sand mixing equipment, U is the maximum safety opening value of the liquid level control valve of the sand mixing equipment, and V is the current fracturing construction discharge;

[0053] When 50%J≤the real-time agitator tank liquid level of the sand mixing equipment <70%J, the agitator tank liquid level control valve opening of the sand mixing equipment is set to 100%U, and the fracturing construction discharge is set to 50%V, wherein J is the agitator tank safety liquid level threshold value of the sand mixing equipment, U is the maximum safety opening value of the liquid level control valve of the sand mixing equipment, and V is the current fracturing construction discharge;

[0054] When 20%J≤ real-time mixing tank liquid level of the sand mixing device < 50%J, the mixing tank liquid level control valve opening of the sand mixing device, the fracturing operation discharge capacity, the sand mixing device suction pump speed, and the sand mixing device discharge pump speed are all set to 0.

[0055] The present application realizes linkage control of the sand mixing device and the fracturing pump injection device based on multi-level protection and linkage logic, reduces the "tank overflow" and "emptying" phenomena, and thus effectively reduces the influence of abnormal conditions on the construction operation, improves the safety, stability and efficiency of the construction operation, so as to achieve the purpose of optimizing the oil field fracturing operation, and specific beneficial effects include:

[0056] (1) When the real-time mixing tank liquid level of the sand mixing device exceeds the liquid level safety threshold, the real-time fracturing operation discharge capacity collected by the sand mixing device and the real-time fracturing operation pressure collected by the instrument system are monitored in linkage, in response to the real-time fracturing operation discharge capacity V collected by the sand mixing device being less than the fracturing operation discharge capacity safety threshold Vm, the belonging numerical interval of the real-time fracturing operation pressure P collected by the instrument system is determined, and corresponding control steps are executed according to the determination result, in response to the real-time fracturing operation discharge capacity V collected by the sand mixing device being equal to the fracturing operation discharge capacity safety threshold Vm, the anti-tank overflow safety parameter Q is introduced, and the sand concentration and the fracturing operation discharge capacity are adjusted according to the size of the anti-tank overflow safety parameter Q, and finally the "tank overflow" risk of the sand mixing device is eliminated.

[0057] (2) When the real-time suction pressure of the fracturing pump injection device is less than the suction pressure safety threshold, the belonging numerical interval of the real-time mixing tank liquid level of the sand mixing device is judged, and the real-time mixing tank liquid level of the sand mixing device is interlocked with the mixing tank liquid level control valve opening according to the belonging numerical interval of the real-time mixing tank liquid level, the mixing tank liquid level control valve opening, the fracturing operation discharge capacity, the sand mixing device suction pump speed, and the sand mixing device discharge pump speed are controlled, so that the sand mixing device liquid supply capacity is normal, and the fracturing pump works normally without stopping for emptying operation, and the "emptying" risk of the fracturing truck group is eliminated. BRIEF DESCRIPTION OF DRAWINGS

[0058] The present application is not limited by the following examples, and the specific implementation can be determined according to the technical scheme of the present application and the actual situation. Figure 1 The method flowchart of the present application is shown in the figure.

[0059] The device structure diagram of the present application is shown in the figure. Figure 2 The device structure diagram of the present application is shown in the figure. DETAILED DESCRIPTION

[0060] The present application is not limited by the following examples, and the specific implementation can be determined according to the technical scheme of the present application and the actual situation.

[0061] The present application is not limited by the following examples, and the specific implementation can be determined according to the technical scheme of the present application and the actual situation.

[0062] Example 1: as shown in the figure Figure 1As shown, the embodiment of the present application discloses a fracturing sand mixing device and pump injection device linkage operation method for oil field fracturing operation, comprising:

[0063] Step S110, real-time monitoring of the real-time mixing tank liquid level of the sand mixing device and the real-time suction pressure of the fracturing pump injection device;

[0064] Step S120, the real-time mixing tank liquid level of the sand mixing device exceeds the liquid level safety threshold, triggering the anti-overflow safety mechanism, and performing linkage operation according to the anti-overflow safety condition, wherein the anti-overflow safety mechanism is obtained by linkage monitoring of the real-time fracturing construction discharge capacity collected by the sand mixing device and the real-time fracturing construction pressure collected by the instrument system, and adjusting the mixing tank liquid level safety threshold, the suction pump and discharge pump rotating speed of the sand mixing device, the sand concentration, and the fracturing construction discharge capacity according to different monitoring results;

[0065] The above anti-overflow safety condition comprises:

[0066] (1) When V<Vm, the real-time fracturing construction pressure collected by the instrument system is compared, and the mixing tank liquid level safety threshold, the sand mixing device liquid level control valve opening degree, and the suction pump and discharge pump rotating speed of the sand mixing device are adjusted according to the comparison result, wherein V is the real-time fracturing construction discharge capacity collected by the sand mixing device, Vm is the fracturing construction discharge capacity safety threshold, and the numerical comparison is performed by using a plurality of numerical intervals formed by the fracturing construction pressure safety threshold;

[0067] Specifically, it comprises:

[0068] When P<Pm, the mixing tank of the current sand mixing device is in a safe state, and the liquid level control valve can automatically adjust the mixing tank liquid level, wherein P is the real-time fracturing construction pressure collected by the instrument system, and Pm is the fracturing construction pressure safety threshold;

[0069] When Pm≤P<1.2Pm, the mixing tank liquid level safety threshold of the sand mixing device is adjusted by the following formula:

[0070] The mixing tank liquid level safety threshold of the sand mixing device=(Pm / P)*the set mixing tank safety liquid level threshold of the sand mixing device;

[0071] Wherein, P is the real-time fracturing construction pressure collected by the instrument system, and Pm is the fracturing construction pressure safety threshold;

[0072] When P≥1.2Pm, the sand mixing device liquid level control valve opening degree, the sand mixing device suction pump rotating speed, and the sand mixing device discharge pump rotating speed are all adjusted to 0. Here, the sand mixing device liquid level control valve opening degree, the sand mixing device suction pump rotating speed, and the sand mixing device discharge pump rotating speed are all adjusted to 0, so that the sand mixing device stops working, and the pump injection device group stops operation to observe the current pressure, and the real-time fracturing construction discharge capacity collected by the sand mixing device is 0.

[0073] (2) When V = Vm, determine the real-time blowout prevention safety parameter at the current time, and when the blowout prevention safety parameter is not less than 0, reset the sand concentration, and adjust the fracturing construction discharge, the suction pump and the discharge pump speed of the sand mixing device correspondingly, wherein V is the real-time fracturing construction discharge collected by the sand mixing device, and Vm is the fracturing construction discharge safety threshold.

[0074] Specifically, it comprises:

[0075] Determine the real-time blowout prevention safety parameter Q at the current time, and judge it, wherein the blowout prevention safety parameter Q is obtained by real-time derivation of the real-time fracturing construction pressure collected by the fracturing pump injection device on the time axis, that is,

[0076] If Q < 0, the fracturing construction is normal operation;

[0077] If Q ≥ 0, judge whether Q ≥ β, and in response to yes, set the sand concentration to 0, and adjust the fracturing construction discharge, the suction pump speed of the sand mixing device and the discharge pump speed of the sand mixing device to 0, and in response to no, set the sand concentration and the fracturing construction discharge by using the following formula respectively;

[0078] Sand concentration = sanding safety factor a * blowout prevention safety parameter Q * current fracturing construction sand concentration value S;

[0079] Fracturing construction discharge = sanding safety factor a * blowout prevention safety parameter Q * fracturing construction discharge safety threshold Vm.

[0080] Q ≥ 0 and Q < β, then reset the sand concentration and the fracturing construction discharge by the above formula, and after resetting the fracturing construction discharge, the fracturing pump injection device unit adjusts the discharge according to the set fracturing construction discharge, wherein the current fracturing construction sand concentration value S is obtained directly through the control end of the sand mixing device, the sanding safety factor a is the sanding safety factor, and 0 ≤ a < 1, the sand concentration will be reduced by the same proportion according to the sanding safety factor.

[0081] (3) When V > Vm, the sand mixing device stirring tank has no risk of “blowout” phenomenon.

[0082] The embodiment of the present application is directed to the problem in the prior art that the sand mixing device suddenly reduces the displacement of the fracturing pump injection device due to abnormal operation of the fracturing pump injection device, which causes the sand mixing device to suck in more liquid than discharge, and further causes the fracturing liquid in the mixing tank of the sand mixing vehicle to exceed the tank capacity, resulting in the phenomenon of "tank overflow". The step S120 is provided to monitor the real-time mixing tank liquid level of the sand mixing device. When the real-time mixing tank liquid level of the sand mixing device exceeds the liquid level safety threshold, the anti-tank overflow safety mechanism is triggered, and the linkage operation is performed according to the anti-tank overflow safety condition. The anti-tank overflow safety condition is obtained by linkage monitoring of the sand mixing device and the fracturing pump injection device, and controlling the mixing tank liquid level safety threshold of the sand mixing device, the suction pump and discharge pump speed of the sand mixing device, the sand concentration, and the fracturing construction displacement according to different monitoring results. The linkage monitoring of the sand mixing device and the fracturing pump injection device is obtained by analyzing the relevant data of the historical "tank overflow" phenomenon. In this embodiment, the anti-tank overflow safety condition is specifically disclosed in step S120.

[0083] In this embodiment, when the real-time mixing tank liquid level of the sand mixing device exceeds the liquid level safety threshold, in response to the real-time fracturing construction displacement V collected by the sand mixing device being less than the fracturing construction displacement safety threshold Vm, the numerical interval of the real-time fracturing construction pressure P collected by the instrument system is determined (i.e., multiple levels of protection are provided), and the corresponding control steps are performed according to the determination result. The core of the control steps is to reduce the risk of abnormal mixing tank liquid level in the sand mixing device. In response to the real-time fracturing construction displacement V collected by the sand mixing device being equal to the fracturing construction displacement safety threshold Vm, the anti-tank overflow safety parameter Q is introduced, and the sand concentration and the fracturing construction displacement are adjusted according to the size of the anti-tank overflow safety parameter Q, so as to ultimately eliminate the risk of "tank overflow" of the mixing tank of the sand mixing device.

[0084] Step S130, the real-time suction pressure of the fracturing pump injection device is less than the suction pressure safety threshold, triggering the anti-evacuation safety mechanism, and performing linkage operation according to the anti-evacuation safety condition. The anti-evacuation safety condition is obtained by linkage interlocking of the real-time mixing tank liquid level of the sand mixing device and the mixing tank liquid level control valve opening degree of the sand mixing device, and controlling the fracturing construction displacement to decrease proportionally.

[0085] The above anti-evacuation safety condition includes:

[0086] When 70%J ≤ the real-time mixing tank liquid level of the sand mixing device < 90%J, the mixing tank liquid level control valve opening degree of the sand mixing device is set to 70%U, and the fracturing construction displacement is set to 70%V, where J is the mixing tank safety liquid level threshold of the sand mixing device, U is the maximum safety opening degree value of the liquid level control valve of the sand mixing device, and V is the current fracturing construction displacement.

[0087] When 50%J≤ the real-time mixing tank liquid level of the sand mixing device < 70%J, the mixing tank liquid level control valve opening of the sand mixing device is set to 100%U, and the fracturing operation discharge is set to 50%V, wherein J is the mixing tank safety liquid level threshold of the sand mixing device, U is the maximum safety opening value of the liquid level control valve of the sand mixing device, and V is the current fracturing operation discharge;

[0088] When 20%J≤ the real-time mixing tank liquid level of the sand mixing device < 50%J, the mixing tank liquid level control valve opening of the sand mixing device, the fracturing operation discharge, the sand mixing device suction pump speed, and the sand mixing device discharge pump speed are all set to 0.

[0089] The embodiment of the present application is aimed at the problem in the prior art that when the liquid supply capacity of the sand mixing device is insufficient, air enters the fracturing pump, which causes the fracturing pump to be unable to work normally and requires parking for emptying operation, and the fracturing unit has the "emptying" phenomenon. The above step S120 is set to monitor the real-time suction pressure of the fracturing pump injection device, and when the real-time suction pressure of the fracturing pump injection device is less than the suction pressure safety threshold, the anti-emptying safety mechanism is triggered, and the linkage operation is performed according to the anti-emptying safety condition. The anti-emptying safety condition is obtained by analyzing the relevant data of the historical "emptying" phenomenon, and is described in the anti-emptying safety condition in step S130 in the embodiment.

[0090] In the embodiment, the specific anti-blowing tank safety condition judges the belonging value interval of the real-time mixing tank liquid level of the sand mixing device (i.e. multiple protection is set), the real-time mixing tank liquid level of the sand mixing device is linked and interlocked with the mixing tank liquid level control valve opening, the mixing tank liquid level control valve opening, the fracturing operation discharge, the sand mixing device suction pump speed, and the sand mixing device discharge pump speed are correspondingly controlled, so that the liquid supply capacity of the sand mixing device is normal, and the fracturing pump works normally without the need for parking for emptying operation, thereby eliminating the "emptying" risk of the fracturing unit.

[0091] Embodiment 2: as shown in the accompanying Figure 2 The present application discloses a fracturing sand mixing device and pump injection device linkage operation device for oil field fracturing operation, which comprises:

[0092] (1) a sand mixing device linkage operation part, comprising a mixing tank liquid level monitoring unit, a liquid level control unit, and a first linkage control unit, wherein the liquid level control unit comprises a sand mixing device suction pump control module, a sand mixing device discharge pump control module, and a liquid level valve control module;

[0093] The mixing tank liquid level monitoring unit monitors the real-time mixing tank liquid level of the sand mixing device in real time. The mixing tank liquid level monitoring unit herein can be a liquid level sensor arranged in the mixing tank;

[0094] The first linkage control unit is linked with the liquid level control unit and the fracturing pump injection equipment linkage operation part. When the real-time mixing tank liquid level of the sand mixing equipment exceeds the liquid level safety threshold, a blowout prevention safety mechanism is triggered, and linkage operation is performed according to the blowout prevention safety condition. The blowout prevention safety mechanism is obtained by linkage monitoring of the real-time fracturing construction discharge capacity collected by the sand mixing equipment and the real-time fracturing construction pressure collected by the instrument system, and adjusting the mixing tank liquid level safety threshold, the mixing tank suction pump and discharge pump rotating speed, the sand concentration and the fracturing construction discharge capacity. The first linkage control unit can be a PLC module, and the liquid level control unit is a control driving device of the sand mixing equipment liquid level control valve, the sand mixing equipment suction pump and the sand mixing equipment discharge pump.

[0095] The blowout prevention safety condition in the first linkage control unit includes:

[0096] When V < Vm, specifically including:

[0097] When P < Pm, the mixing tank of the current sand mixing equipment is in a safe state, wherein P is the real-time fracturing construction pressure collected by the instrument system, and Pm is the fracturing construction pressure safety threshold;

[0098] When Pm≤P < 1.2Pm, the mixing tank liquid level safety threshold of the sand mixing equipment is adjusted by the following formula:

[0099] The mixing tank liquid level safety threshold of the sand mixing equipment = (Pm / P) * the set mixing tank safety liquid level threshold of the sand mixing equipment;

[0100] Wherein, P is the real-time fracturing construction pressure collected by the instrument system, and Pm is the fracturing construction pressure safety threshold;

[0101] When P≥1.2Pm, the sand mixing equipment liquid level control valve opening, the sand mixing equipment suction pump rotating speed and the sand mixing equipment discharge pump rotating speed are all adjusted to 0;

[0102] When V = Vm, specifically including:

[0103] Determine the real-time blowout prevention safety parameter Q at the current time, and judge it, wherein the blowout prevention safety parameter is obtained by real-time derivation of the real-time fracturing construction pressure collected by the fracturing pump injection equipment on the time axis;

[0104] If Q < 0, the fracturing construction is normal operation;

[0105] If Q≥0, it is judged whether Q≥β. In response to yes, the sand concentration is set to 0, and the fracturing construction discharge capacity, the sand mixing equipment suction pump rotating speed and the sand mixing equipment discharge pump rotating speed are all adjusted to 0. In response to no, the sand concentration and the fracturing construction discharge capacity are set respectively by the following formula:

[0106] Sand concentration = sanding safety factor α * anti-collapsing safety parameter Q * current fracturing operation sand concentration value S;

[0107] Fracturing operation displacement = sanding safety factor α * anti-collapsing safety parameter Q * fracturing operation displacement safety threshold value Vm.

[0108] (2) The fracturing pump injection equipment linkage operation part includes an intake pressure monitoring unit, a displacement control unit, and a second linkage control unit;

[0109] The intake pressure monitoring unit monitors the real-time intake pressure of the fracturing pump injection equipment in real time; the intake pressure monitoring unit can be a pressure sensor;

[0110] The second linkage control unit is linked with the displacement control unit and the sand mixing equipment linkage operation part, and triggers an anti-evacuation safety mechanism when the real-time intake pressure of the fracturing pump injection equipment is less than the intake pressure safety threshold value, and performs linkage operation according to anti-evacuation safety conditions, wherein the anti-evacuation safety conditions are obtained by linkage interlocking the real-time mixing tank liquid level of the sand mixing equipment and the mixing tank liquid level control valve opening degree of the sand mixing equipment, and controlling the fracturing operation displacement. The second linkage control unit can be a PLC module, and the displacement control unit is software for controlling the fracturing operation displacement in actual production.

[0111] The anti-collapsing safety conditions in the second linkage control unit include:

[0112] When 70%J≤ the real-time mixing tank liquid level of the sand mixing equipment < 90%J, the mixing tank liquid level control valve opening degree of the sand mixing equipment is set to 70%U, and the fracturing operation displacement is set to 70%V, wherein J is the mixing tank safety liquid level threshold value of the sand mixing equipment, U is the maximum safety opening degree value of the liquid level control valve of the sand mixing equipment, and V is the current fracturing operation displacement;

[0113] When 50%J≤ the real-time mixing tank liquid level of the sand mixing equipment < 70%J, the mixing tank liquid level control valve opening degree of the sand mixing equipment is set to 100%U, and the fracturing operation displacement is set to 50%V, wherein J is the mixing tank safety liquid level threshold value of the sand mixing equipment, U is the maximum safety opening degree value of the liquid level control valve of the sand mixing equipment, and V is the current fracturing operation displacement;

[0114] When 20%J≤ the real-time mixing tank liquid level of the sand mixing equipment < 50%J, the mixing tank liquid level control valve opening degree of the sand mixing equipment, the fracturing operation displacement, the sand mixing equipment suction pump speed, and the sand mixing equipment discharge pump speed are all set to 0.

[0115] The above technical features constitute embodiments of the present application, which have strong adaptability and implementation effect. Non-essential technical features can be added or removed as needed to meet the needs of different situations.

Claims

1. A method for the combined operation of a fracturing sand blender and a pump-down unit for use in oilfield fracturing operations, characterized in that, include: Real-time monitoring of the real-time liquid level in the mixing tank of the sand mixing equipment and the real-time suction pressure of the fracturing pump; If the real-time liquid level in the mixing tank of the sand mixing equipment exceeds the safety threshold, the anti-overflow safety mechanism is triggered. Based on the anti-overflow safety conditions, the linkage operation is executed. The anti-overflow safety mechanism is constructed by linking the real-time fracturing operation displacement collected by the sand mixing equipment and the real-time fracturing operation pressure collected by the instrument system, and adjusting the mixing tank liquid level safety threshold, the speed of the sand mixing equipment suction pump and discharge pump, the sand concentration, and the fracturing operation displacement according to different monitoring results. If the real-time suction pressure of the fracturing pump is lower than the suction pressure safety threshold, the anti-cavitation safety mechanism is triggered. The linkage operation is executed according to the anti-cavitation safety conditions. The anti-cavitation safety conditions are obtained by the real-time mixing tank liquid level of the sand mixing equipment and the opening of the mixing tank liquid level control valve of the sand mixing equipment, and by controlling the fracturing operation discharge rate.

2. The method for the fracturing sand blending equipment for oilfield fracturing operation and pump injection equipment linkage operation according to claim 1 or 2, characterized in that, The safety conditions for the anti-overflow tank include: When V < Vm, the real-time fracturing operation pressure collected by the instrument system is compared numerically. Based on the comparison results, the safety threshold of the mixing tank liquid level of the sand mixing equipment, the opening degree of the liquid level control valve of the sand mixing equipment, and the speed of the suction pump and discharge pump of the sand mixing equipment are adjusted accordingly. Here, V is the real-time fracturing operation displacement collected by the sand mixing equipment, and Vm is the safety threshold of the fracturing operation displacement. The numerical comparison is performed using multiple numerical ranges formed by the safety threshold of the fracturing operation pressure. When V = Vm, determine the real-time safety parameter for preventing tank overflow at the current time. When the safety parameter for preventing tank overflow is not less than 0, reset the sand concentration and adjust the fracturing operation displacement, the suction pump speed of the sand mixing equipment, and the discharge pump speed accordingly. Here, V is the real-time fracturing operation displacement collected by the sand mixing equipment, and Vm is the safety threshold for fracturing operation displacement.

3. The method of claim 2, wherein the method further comprises: The anti-overflow safety conditions for tanks when V < Vm specifically include: When P < Pm, the mixing tank of the current sand mixing equipment is in a safe state, where P is the real-time fracturing construction pressure collected by the instrument system, and Pm is the safe threshold for fracturing construction pressure. When Pm≤P<1.2Pm, the safety threshold of the liquid level in the mixing tank of the sand mixing equipment is adjusted by the following formula; The safe threshold for the liquid level in the mixing tank of the sand mixing equipment = (Pm / P) * the set safe threshold for the liquid level in the mixing tank of the sand mixing equipment; Where P is the real-time fracturing pressure collected by the instrument system, and Pm is the safe threshold for fracturing pressure. When P≥1.2Pm, the opening of the liquid level control valve of the sand mixing equipment, the speed of the suction pump of the sand mixing equipment, and the speed of the discharge pump of the sand mixing equipment should all be adjusted to 0.

4. The method for coordinated operation of fracturing sand mixing equipment and pumping equipment for oilfield fracturing operations according to claim 2 or 3, characterized in that, The safety conditions for preventing overflow of the tank when V = Vm specifically include: Determine the real-time safety parameter Q for preventing tank overflow at the current time and make a judgment on it. The safety parameter for preventing tank overflow is obtained by differentiating the real-time fracturing construction pressure collected by the fracturing pump injection equipment on the time axis in real time. If Q < 0, then the fracturing operation is proceeding normally; If Q≥0, determine whether Q≥β. If yes, set the sand concentration to 0 and adjust the fracturing operation flow rate, the speed of the sand mixing equipment suction pump, and the speed of the sand mixing equipment discharge pump to 0. If no, set the sand concentration and fracturing operation flow rate using the following formulas respectively. Sand concentration = Sand addition safety factor α * Safety parameter for preventing overflow Q * Current sand concentration value for fracturing operation S; Fracturing operation displacement = sand addition safety factor α * anti-overflow safety parameter Q * fracturing operation displacement safety threshold Vm.

5. The method for coordinated operation of fracturing sand mixing equipment and pumping equipment for oilfield fracturing operations according to any one of claims 1 to 4, characterized in that, The anti-cavitation safety conditions include: When 70%J≤real-time mixing tank liquid level of the sand mixing equipment<90%J, the opening degree of the mixing tank liquid level control valve of the sand mixing equipment is set to 70%U, and the fracturing operation displacement is set to 70%V, where J is the safe liquid level threshold of the mixing tank of the sand mixing equipment, U is the maximum safe opening value of the liquid level control valve of the sand mixing equipment, and V is the current fracturing operation displacement. When 50%J≤real-time mixing tank liquid level of the sand mixing equipment<70%J, the opening degree of the mixing tank liquid level control valve of the sand mixing equipment is set to 100%U, and the fracturing operation displacement is set to 50%V, where J is the safe liquid level threshold of the mixing tank of the sand mixing equipment, U is the maximum safe opening value of the liquid level control valve of the sand mixing equipment, and V is the current fracturing operation displacement. When 20%J≤real-time mixing tank liquid level of the sand mixing equipment<50%J, the opening degree of the mixing tank liquid level control valve, the fracturing operation discharge rate, the speed of the sand mixing equipment suction pump, and the speed of the sand mixing equipment discharge pump will all be set to 0.

6. A linkage device for fracturing sand mixing equipment and pumping equipment used in oilfield fracturing operations, employing the method described in any one of claims 1 to 5, characterized in that, include: The linkage operation part of the sand mixing equipment includes a mixing tank liquid level monitoring unit, a liquid level control unit and a first linkage control unit, wherein the liquid level control unit includes a sand mixing equipment suction pump control module, a sand mixing equipment discharge pump control module and a liquid level valve control module; The mixing tank liquid level monitoring unit monitors the real-time liquid level of the mixing tank in the sand mixing equipment. The first linkage control unit is linked with the liquid level control unit and the linkage operation part of the fracturing pump injection equipment. When the real-time liquid level in the mixing tank of the sand mixing equipment exceeds the liquid level safety threshold, the anti-overflow safety mechanism is triggered. The linkage operation is performed according to the anti-overflow safety conditions. The anti-overflow safety mechanism is constructed by linking and monitoring the real-time fracturing operation displacement collected by the sand mixing equipment and the real-time fracturing operation pressure collected by the instrument system, and adjusting the liquid level safety threshold of the mixing tank, the speed of the suction pump and discharge pump of the sand mixing equipment, the sand concentration, and the fracturing operation displacement according to different monitoring results. The linkage operation section of the fracturing pump injection equipment includes an intake pressure monitoring unit, a discharge control unit, and a second linkage control unit; The suction pressure monitoring unit monitors the real-time suction pressure of the fracturing pump injection equipment. The second linkage control unit is linked with the displacement control unit and the linkage operation part of the sand mixing equipment. When the real-time suction pressure of the fracturing pump injection equipment is less than the suction pressure safety threshold, the anti-cavitation safety mechanism is triggered. The linkage operation is performed according to the anti-cavitation safety conditions. The anti-cavitation safety conditions are obtained by the real-time mixing tank liquid level of the sand mixing equipment and the opening of the mixing tank liquid level control valve of the sand mixing equipment, and by controlling the fracturing construction displacement.

7. The linkage operation device for fracturing sand mixing equipment and pumping equipment for oilfield fracturing operations according to claim 6, characterized in that, The anti-overflow safety conditions in the first linkage control unit include: When V < Vm, specifically including: When P < Pm, the mixing tank of the current sand mixing equipment is in a safe state, where P is the real-time fracturing construction pressure collected by the instrument system, and Pm is the safe threshold for fracturing construction pressure. When Pm≤P<1.2Pm, the safety threshold of the liquid level in the mixing tank of the sand mixing equipment is adjusted by the following formula; The safe threshold for the liquid level in the mixing tank of the sand mixing equipment = (Pm / P) * the set safe threshold for the liquid level in the mixing tank of the sand mixing equipment; Where P is the real-time fracturing pressure collected by the instrument system, and Pm is the safe threshold for fracturing pressure. When P≥1.2Pm, the opening of the liquid level control valve of the sand mixing equipment, the speed of the suction pump of the sand mixing equipment, and the speed of the discharge pump of the sand mixing equipment should all be adjusted to 0. When V = Vm, specifically including: Determine the real-time safety parameter Q for preventing tank overflow at the current time and make a judgment on it. The safety parameter for preventing tank overflow is obtained by differentiating the real-time fracturing construction pressure collected by the fracturing pump injection equipment on the time axis in real time. If Q < 0, then the fracturing operation is proceeding normally; If Q≥0, determine whether Q≥β. If yes, set the sand concentration to 0 and adjust the fracturing operation flow rate, the speed of the sand mixing equipment suction pump, and the speed of the sand mixing equipment discharge pump to 0. If no, set the sand concentration and fracturing operation flow rate using the following formulas respectively. Sand concentration = Sand addition safety factor α * Safety parameter for preventing overflow Q * Current sand concentration value for fracturing operation S; Fracturing operation displacement = sand addition safety factor α * anti-overflow safety parameter Q * fracturing operation displacement safety threshold Vm.

8. The linkage operation device for fracturing sand mixing equipment and pumping equipment for oilfield fracturing operations according to claim 6 or 7, characterized in that, The anti-overflow safety conditions in the second linkage control unit include: When 70%J≤real-time mixing tank liquid level of the sand mixing equipment<90%J, the opening degree of the mixing tank liquid level control valve of the sand mixing equipment is set to 70%U, and the fracturing operation displacement is set to 70%V, where J is the safe liquid level threshold of the mixing tank of the sand mixing equipment, U is the maximum safe opening value of the liquid level control valve of the sand mixing equipment, and V is the current fracturing operation displacement. When 50%J≤real-time mixing tank liquid level of the sand mixing equipment<70%J, the opening degree of the mixing tank liquid level control valve of the sand mixing equipment is set to 100%U, and the fracturing operation displacement is set to 50%V, where J is the safe liquid level threshold of the mixing tank of the sand mixing equipment, U is the maximum safe opening value of the liquid level control valve of the sand mixing equipment, and V is the current fracturing operation displacement. When 20%J≤real-time mixing tank liquid level of the sand mixing equipment<50%J, the opening degree of the mixing tank liquid level control valve, the fracturing operation discharge rate, the speed of the sand mixing equipment suction pump, and the speed of the sand mixing equipment discharge pump will all be set to 0.

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