Fracturing system and control system and method for the fracturing system

Patent metadata

Field	Value
Publication number	US-11739623-B2
Application number	US-202117384870-A
Country	US
Kind code	B2
Filing date	Jul 26, 2021
Priority date	Apr 2, 2021
Publication date	Aug 29, 2023
Grant date	Aug 29, 2023

Abstract

A control system includes: a fracturing control device configured to acquire a target fracturing pressure of a fracturing unit, perform closed-loop control on the fracturing unit by taking the target fracturing pressure as a control target, and set a target sand blending pressure for the sand blending unit; a sand blending control device configured to perform closed-loop control on the sand blending unit by taking the target sand blending pressure as a control target.

First claim

We claim:

1. A control system for controlling a fracturing system in wellsite operation, the fracturing system comprising a fracturing unit for fracturing hydrocarbon reservoirs and a sand blending unit for blending fracturing fluid and proppants and supplying blended mixture to the fracturing unit, wherein the control system is configured to perform linkage control on the fracturing unit and the sand blending unit, wherein the control system comprises:
a fracturing control device configured to acquire a target fracturing pressure of the fracturing unit, perform first closed-loop control on the fracturing unit with the target fracturing pressure as a first control target, and set a target sand blending pressure for the sand blending unit according to the target fracturing pressure and a fracturing pressure deviation between the target fracturing pressure and a current fracturing pressure of the fracturing unit; and
a sand blending control device configured to perform second closed-loop control on the sand blending unit with the target sand blending pressure as a second control target.

2. The control system according to claim 1 , wherein the fracturing system further comprises a mixing unit for preparing and supplying fracturing fluid to the sand blending unit, the control system further comprises a mixing control device, wherein the sand blending control device is configured to set a target mixing discharge amount for the mixing unit, and the mixing control device is configured to perform third closed-loop control on the mixing unit and set a raw material supply amount for the fracturing system with the target mixing discharge amount as a third control target.

3. The control system according to claim 2 , wherein the linkage control of the control system is performed as follows:
the fracturing control device acquiring the fracturing pressure deviation between the target fracturing pressure and the current fracturing pressure of the fracturing unit; acquiring a fracturing pressure increment of the fracturing unit based on the fracturing pressure deviation; obtaining a first sum of the target fracturing pressure and the fracturing pressure increment, and setting the first sum as the target sand blending pressure for the sand blending unit;
the sand blending control device acquiring a target sand blending input amount of the sand blending unit according to the target sand blending pressure; acquiring a sand blending pressure deviation between the target sand blending pressure and a current sand blending pressure of the sand blending unit; acquiring a sand blending input amount increment of the sand blending unit based on the sand blending pressure deviation; obtaining a second sum of the target sand blending input amount and the sand blending input amount increment, and setting the second sum as a target mixing discharge amount for the mixing unit; and
the mixing unit acquiring a target blending input amount of the mixing unit according to the target mixing discharge amount; acquiring a mixing amount deviation between the target mixing discharge amount and a current mixing discharge amount of the mixing unit; acquiring a mixing input amount increment of the mixing unit based on the mixing amount deviation; obtaining a second sum of the target mixing input amount and the mixing input amount increment, and setting the third sum as the raw material supply amount for the fracturing system.

4. The control system according to claim 3 , wherein static look-up table models respectively corresponding to the fracturing unit and/or the sand blending unit and/or the mixing unit are provided, wherein the target fracturing pressure and/or the target sand blending input amount and/or the target mixing input amount are acquired from the static look-up table models.

5. The control system according to claim 4 , wherein,
the fracturing pressure increment is acquired from a first dynamic look-up table model at an operating condition point of the target fracturing pressure based on the fracturing pressure deviation; and/or
the sand blending input amount increment is acquired from a second dynamic look-up table model at an operating condition point of the target sand blending input amount based on the sand blending pressure deviation; and/or
the mixing input amount increment is acquired from a third dynamic look-up table model at an operating condition point of the target mixing input amount based on the blending mixing amount deviation.

6. The control system according to claim 5 , wherein the control system is configured to monitor an actual output amount of the fracturing unit and/or the sand blending unit and/or the mixing unit to identify whether an error occurs.

7. The control system according to claim 6 , wherein the fracturing control device further comprises a fracturing pressure distribution unit, configured to distribute fracturing fluid to various fracturing mechanisms of the fracturing unit according to the target fracturing pressure.

8. The control system according to claim 7 , wherein the control system further comprises a clear water tank control unit configured to control a clear water tank of the fracturing system to feed water when a liquid level of the clear water tank is lower than a preset minimum liquid level.

9. The control system according to claim 1 , wherein the fracturing control device is configured to acquire the target fracturing pressure of the fracturing unit according to a wellhead pressure, a manual input, process requirements or software calculation.

10. A fracturing system comprising:
a fracturing unit for fracturing hydrocarbon reservoirs;
a sand blending unit for blending fracturing fluid with proppants and supplying blended mixture to the fracturing unit, and
a control system, wherein the control system comprises:
a fracturing control device configured to acquire a target fracturing pressure of the fracturing unit, perform first closed-loop control on the fracturing unit with the target fracturing pressure as a first control target, and set a target sand blending pressure for the sand blending unit according to the target fracturing pressure and a fracturing pressure deviation between the target fracturing pressure and a current fracturing pressure of the fracturing unit; and
a sand blending control device configured to perform second closed-loop control on the sand blending unit with the target sand blending pressure as a second control target.

11. The fracturing system according to claim 10 , wherein the sand blending unit comprises a sand conveying belt and a packing auger, wherein the sand conveying belt supplies sand proppants to the packing auger, and a rotation speed of the packing auger is adjusted by the sand blending control device.

12. The fracturing system according to claim 10 , wherein the fracturing system further comprises a mixing unit for preparing and supplying fracturing fluid to the sand blending unit, the control system further comprises a mixing control device, wherein the sand blending control device is configured to set a target mixing discharge amount for the mixing unit, and the mixing control device is configured to perform third closed-loop control on the mixing unit and set a raw material supply amount for the fracturing system with the target mixing discharge amount as a third control target.

13. The fracturing system according to claim 12 , wherein the linkage control of the control system is performed as follows:
the fracturing control device acquiring the fracturing pressure deviation between the target fracturing pressure and the current fracturing pressure of the fracturing unit; acquiring a fracturing pressur

Assignees

• Yantai Jereh Petroleum Equipment & Technologies Co Ltd

Inventors

• Liu Kaishen
• Li Xiance
• Cui Shuzhen
• Mao Zhuqing
• Liu Weiwei
• Li Liang
• Zhang Pengyuan
• Zhao Dawei

Classifications

• E21B43/267 Primary

  reinforcing fractures by propping · CPC title

• E21B43/26 Primary

  by forming crevices or fractures · CPC title

• E21B43/2607

  Surface equipment specially adapted for fracturing operations · CPC title