Study and application of high pressure sampling technology

The traditional clock-controlled and electric-controlled sampler needs presetting time, so it is complicate for operation, and the O/W contact is hard to obtain, leading to low success ratio of sampling. For high pour point oil and heavy oil wells, the sampler is light, so it can not be tripped by cable. To solve the problems above, a new sampler is invented, which is not controlled by time, and the status of open or close can be controlled by raising and lowering cable. The control element can be lowered with string and control SQ3 sampler open or close during setting or unseating packers. And relating sampling technology is designed. The sampler is put to use and 85 samples have been obtained. The sampling success ratio is increased from 46.6％ to 92.2％. Therefore, the sampling difficulties for high pour point oil well, heavy oil well, and high water cut well have been solved.