Method and device for controlling wellbore trajectory of stepped horizontal well

Abstract

The invention discloses a method and a device for controlling the wellbore trajectory of a stepped horizontal well, which belong to the field of oilfield exploitation. The method includes the following steps: acquiring the depth of a target oil reservoir, the change of the dip angle of the target reservoir, the fault distance of a fault and the relative positions of fault plates according to the seismic data; and by starting from the development well location of the target oil reservoir, continuously adjusting the drilling direction of the drill bit to complete the drilling of a straight section, a first horizontal section, a stepped section and a second horizontal section of the stepped horizontal well. The depth of the target oil reservoir, the fault distance of the fault and the relative positions of the fault plates on the two sides of the fault can be acquired in advance according to the seismic data. Therefore, the drilling distance and direction can be adjusted directly in the process of drilling according to the data acquired in advance, the drill bit can enter the target oil reservoir accurately and enter the second horizontal section of the target oil reservoir from the first horizontal section of the target oil reservoir, and the control accuracy of the wellbore trajectory of the stepped horizontal well is improved.

Description

technical field [0001] The invention relates to the field of oilfield exploitation, in particular to a wellbore trajectory control method and device for a stepped horizontal well. Background technique [0002] The fault root of complex fault-block reservoirs is often the enrichment area of ​​remaining oil, and the remaining oil at the fault root is generally exploited by stepped horizontal wells. [0003] In related technologies, in the process of drilling stepped horizontal wells in complex fault-block reservoirs, the direction of the drill bit needs to be adjusted at the fault to ensure that the drill bit can enter the oil layer on the other side of the fault as soon as possible from the oil layer on one side of the fault. The staff generally adjust the drilling direction of the drill bit according to the LWD data and their own judgment, carry out the drilling of the stepped horizontal well, and control the wellbore trajectory of the stepped horizontal well. [0004] Howe...

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Problems solved by technology

[0005] The embodiment of the present invention provides a wellbore trajectory control method and device for a stepped horizontal well, which can solve the problem of low wellbore trajectory control accuracy for a stepped horizontal well in the related art

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