US 12,331,602 B2
Well-killing system for ultra-deep well drilling with co-existence of overflow and lost circulation and operation method thereof
Bangtang Yin, Dongying (CN); Kai Feng, Dongying (CN); Baojiang Sun, Dongying (CN); Zhiyuan Wang, Dongying (CN); Yonghai Gao, Dongying (CN); Hao Li, Dongying (CN); Jianbo Zhang, Dongying (CN); and Guizhen Xin, Dongying (CN)
Assigned to CHINA UNIVERSITY OF PETROLEUM (EAST CHINA), Dongying (CN)
Filed by CHINA UNIVERSITY OF PETROLEUM (EAST CHINA), Dongying (CN)
Filed on Dec. 15, 2024, as Appl. No. 18/981,584.
Claims priority of application No. 202410536527.X (CN), filed on Apr. 30, 2024.
Prior Publication US 2025/0116163 A1, Apr. 10, 2025
Int. Cl. E21B 21/08 (2006.01); E21B 21/10 (2006.01)
CPC E21B 21/08 (2013.01) [E21B 21/106 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A well-killing system for ultra-deep well drilling with co-existence of overflow and lost circulation, comprising:
a wellhead blowout preventer;
a mud pit;
a freshwater tank;
a mud material tank;
a mud preparation tank;
a first pressure sensor;
a first three-way control valve;
a second three-way control valve;
a first mud pump;
a second mud pump;
a lost circulation material mud tank;
a third three-way control valve;
a third mud pump;
a first well-killing fluid tank;
a second well-killing fluid tank;
a second pressure sensor;
a first flowmeter;
a second flowmeter;
a fourth three-way control valve;
a gas-liquid separation tank; and
a computer terminal;
wherein the wellhead blowout preventer is provided on an upper side of a wellhead device; and the mud pit, the freshwater tank, the mud material tank and the mud preparation tank are provided outside a wellhead;
an upper part of the wellhead blowout preventer is connected to a first port of the first three-way control valve through a first pipeline; a second port of the first three-way control valve is connected to a first port of the second three-way control valve through a second pipeline; a second port of the second three-way control valve is connected to the first mud pump and the lost circulation material mud tank through a third pipeline; a third port of the second three-way control valve is connected to the second mud pump and the mud pit through a fourth pipeline; a third port of the first three-way control valve is connected to a first port of the third three-way control valve through a fifth pipeline and a first one-way valve; a second port of the third three-way control valve is connected to the first well-killing fluid tank and the second well-killing fluid tank through a sixth pipeline and the third mud pump; a first port of the fourth three-way control valve is connected to a side of the wellhead device through a seventh pipeline; a second port of the fourth three-way control valve is connected to a third port of the third three-way control valve through an eighth pipeline; a third port of the fourth three-way control valve is connected to the gas-liquid separation tank through a ninth pipeline; a lower end of the gas-liquid separation tank is connected to the mud preparation tank through a tenth pipeline; an upper end of the mud preparation tank is connected to the freshwater tank and the mud material tank through an eleventh pipeline; the first pressure sensor and the first flowmeter are provided at the first pipeline; the second pressure sensor and the second flowmeter are provided at the seventh pipeline; and the first pressure sensor, the first flowmeter, the second pressure sensor and the second flowmeter are connected to the computer terminal via a first data cable, respectively.