| 摘要 |
The present invention provides a measuring unit, a kick information identification apparatus and method, and relates to the oil and gas well engineering field. The measuring unit comprises: a throttling device, mounted on a drill stem; sensors, arranged at the two sides of the throttling device, and configured to sense the pressure and/or temperature at the two sides of the throttling device; and a signal transmitter, configured to transmit the pressure and/or temperature values. The present invention employs a throttling device and measures the pressure drop and/or temperature difference across the throttling device, and can identify kick information successfully according to the pressure drop and/or temperature difference. Even in the case of horizontal wells where the flow and pressure variations are not apparent, the present invention can still attain a good kick information identification effect. |
| 主权项 |
1. A kick information identification apparatus for wellbore pressure control during horizontal drilling, comprising:
a measuring unit, comprising:
a throttling device, mounted on a drill stem;pressure sensors, arranged at two sides of the throttling device, and configured to constantly sense pressure and to output pressure data;temperature sensors, arranged at two sides of the throttling device, and configured to constantly sense temperature and to output temperature data; anda signal transmitter, configured to constantly transmit the sensed pressure and temperature data from the pressure and temperature sensors to a processor; and the processor, configured to perform a kick information identification method, wherein the kick information comprises one or more of the following items: a kick moment, a kick rate, a kick occurrence position, and a kick type, where the kick information identification method comprises the following steps:
providing the throttling device on the drill stem;providing the pressure sensors at two sides of the throttling device for sensing pressure;providing the temperature sensors at two sides of the throttling device for sensing temperature;constantly sensing, by the pressure and temperature sensors, pressure and temperature at the two sides of the throttling device;constantly transmitting, by the signal transmitter, the sensed pressure and temperature data from the pressure and temperature sensors to the processor;repetitively monitoring, by the processor, pressure drops in the throttling device based on the sensed pressure data;repetitively determining, by the processor, a fluid flow rate Q1 through the throttling device corresponding to the monitored pressure drops in the throttling device;repetitively monitoring, by the processor, a temperature rising rate based on the sensed temperature data;determining, by the processor, a kick moment t0 based on the monitored pressure drops;determining, by the processor, a moment t1 when the temperature rising rate is greater than a preset temperature rising rate;determining, by the processor, a distance L1 of the kick occurrence position from the measuring unit,whereinL1=Q1(t1-t0)A where, A is a sectional area of an annulus. |
