Same-position coring and sampling logging method
A coring and logging technology, which is used in the extraction of undisturbed core devices, measurement, and earth-moving drilling, etc., can solve the problems of rising surges, occupying platform wellheads for a long time, and taking a long time, so as to improve safety and reduce The effect of taking up time at the wellhead and saving operating costs
Active Publication Date: 2021-09-03
CHINA OILFIELD SERVICES
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[0003]
Under the existing technology system, borehole coring and formation testing belong to two different logging sequences, which require the use of two series of completely incompatible instruments to complete the two series of logging operations, requiring multiple lifting and lowering Instruments, which make the operation service process occupy the wellhead of the platform for a long time, increase the risk of downhole instrument sticking, and high operation intensity, especially in the deep water field, these factors have caused a sharp increase in operation costs
As a secondary operation, pressure measurement and sampling takes a long time. When coring is required, the formation characteristics have changed with time, and the obtained cores cannot reflect the actual formation characteristics more effectively. The data of the cable test and the data of drilling and mud logging are used to evaluate the formation
It is difficult to obtain cores and formation fluids with the same exploration for multiple downholes in different series, and the downhole posture of the instrument cannot be guaranteed. Therefore, it is even more impossible to obtain cores and formation fluids at the same point at present
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[0039] In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.
[0040] The current pressure measurement and sampling operations take a long time. When coring is required, the formation characteristics have changed with time, and the obtained cores cannot more effectively reflect the actual formation characteristics. As far as the current situation is concerned, it is difficult to obtain cores and formation fluids at the same depth after multiple trips in different series, and the downhole posture of the instrument cannot be guaranteed. Therefore, there is currently no co-located coring sampling logging technology.
[0041] see Figure 1 ...
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The invention discloses a same-position coring and sampling logging method, and relates to the field of well logging. The same-position coring and sampling logging method comprises the following steps that an underground instrument is lowered to a target layer, and a first point location is determined on a well wall; one of coring and sampling is carried out on the first point location; and another operation is carried out on the first point location. According to the same-position coring and sampling logging method, same-position coring and sampling technology can be achieved, that is, coring and sampling points are located at the same depth and in the same direction, the obtained fluid is purer, and the obtained stratum objects can further be mutually proved.
Description
technical field [0001] The invention relates to the field of well logging, and more specifically, relates to a logging method for co-located coring and sampling. Background technique [0002] Formation testing sampling technology and formation borehole coring technology are two important logging technologies in exploration and development, and are the core technologies for the exploration and development of complex oil and gas reservoirs. They can quickly and directly identify and evaluate complex oil and gas reservoirs, improve the discovery rate of exploration, and are accurate Indispensable technology for evaluating reservoirs. [0003] Under the existing technology system, borehole coring and formation testing belong to two different logging sequences, which require the use of two series of instruments that are completely incompatible to complete the two series of logging operations, requiring multiple lifting and lowering Instruments make the operation service process ...
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Login to View More IPC IPC(8): E21B25/00E21B47/00
CPCE21B25/00E21B47/00
Inventor 卢涛褚晓冬冯永仁黄琳郭书生韩奋刘铁民薛永增陈永超田志宾
Owner CHINA OILFIELD SERVICES