Wake-up method of formation pressure testing while drilling
A formation pressure, while drilling technology, applied in the direction of measurement, earthwork drilling, wellbore/well components, etc., can solve the problems of increasing drilling costs, increasing the well construction period, and data cannot be decoded, so as to increase stability, wellhead Simplify the device and reduce the effect of the transducer
Inactive Publication Date: 2012-12-05
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology
The whole system is very complicated, and the receiving device (pressure sensor) of the downhole part of the tester is prone to failure. At this time, it is necessary to pull out the drill, take out the instrument for inspection, and run out after repairing or replacing the corresponding accessories, and continue drilling. well cycle, increasing the cost of drilling
On the other hand, whether it is an uplink signal or a downlink signal, it is carried out in the process of drilling fluid circulation. Since the pulse generator of the downhole instrument is used to send positive pulses when data is uploaded, it will interfere with the negative pulse of the downhole signal. cause the data cannot be decoded
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[0010] A kind of formation pressure test wake-up method while drilling provided by the specific embodiment of the present invention (see figure 1 and figure 2 ), the wake-up method of formation pressure test while drilling includes: firstly, inserting the instrument into the drilling tool assembly and going downhole, when reaching the layer to be tested, operate according to the following steps: 1. The controller starts the mud pump and monitors the flow of mud , start timing when the mud flow reaches the power supply flow, and then turn off the mud pump. When the mud flow is less than the critical power supply flow, it is regarded as a power failure, and the control power supply time does not exceed 1min; , to fully discharge the capacitor, repeat step 1; 3. Timing after power-off, after the power-off time exceeds 40s, fully discharge the capacitor, start long-term power supply, until the end of the test action.
[0011] The realization of the wake-up command of the presen...
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The invention provides a wake-up method of a formation pressure testing while drilling. The wake-up method comprises the following steps: firstly, switching an instrument in a drilling tool, and combing the instrument and the drilling tool to go down the hole, when a layer to be detected is arrived, operating the following steps: 1, starting a slurry pump by a controller, monitoring the flow of slurry, when the flow of the slurry reaches a power supply flow, starting timing, and then closing the slurry pump, when the flow of the slurry is smaller than a critical power supply flow, regarding as power failure, and controlling a power supply time to be not more than 1 minute; 2, after power failure, timing, after the power failure time exceeds 40 seconds, fully discharging a capacitor, and repeating the step 1; and 3, after power failure, counting, after the power failure time exceeds 40 seconds, fully discharging a capacitor, and starting long-term power supply until the testing is completed. By utilizing the wake-up manner, a common negative pulse system used for the foreign formation pressure tester while drilling can be replaced. In comparison with Testrak, well head equipment is greatly simplified, and a signal receiver and a decoder are unnecessary for subsurface equipment. Owing to one-way transmission of signals, stability of the whole set of system can be increased.
Description
technical field [0001] The invention relates to a wake-up method for formation pressure testing while drilling, and belongs to the technical field of petroleum. Background technique [0002] Since the beginning of the 21st century, Baker Hughes, Halliburton and Schlumberger have successively launched their respective formation pressure testers while drilling, the most representative of which was developed by Baker Hughes in 2004. Testrak, when doing formation pressure testing, uses ground negative pulses to transmit downlink signals to control downhole instruments to perform various actions. Such as image 3 As shown, Testrak is a wireless drilling equipment, which uses mud pulse to upload data. When the signal is transmitted down, the command is issued by the ground console, and the modulated signal is transmitted through the pulse valve through the transducer, converter, encoder and modulator, and then the signal is received by the downhole receiving device, which also in...
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IPC IPC(8): E21B47/06E21B49/00
Inventor 韩玉安杨决算谷玉堂高翔赵志学白晓捷孟祥光宋瑞宏刘永贵窦金永
Owner BC P INC CHINA NAT PETROLEUM CORP