A method for identifying formations encountered in horizontal wells
A technology for wellbore drilling and horizontal wells, which is applied to wellbore/well components, earth-moving drilling, etc., and can solve the problems of cumbersome operation, inability to form unified rules and method procedures, and many human interference factors.
Active Publication Date: 2020-04-10
PETROCHINA CO LTD
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Problems solved by technology
However, the main problems of this method are that the operation is cumbersome, and the dip angle of the formation needs to be continuously modified, and a unified rule and method flow cannot be formed. Moreover, there are many human interference factors, the processing process is time-consuming, and software programming cannot be realized.
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[0023] The principle and spirit of the present invention will be described below with reference to several exemplary embodiments. It should be understood that these embodiments are only provided to enable those skilled in the art to better understand and then implement the present invention, but not to limit the scope of the present invention in any way. On the contrary, these embodiments are provided to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.
[0024] The invention provides a method for identifying formations encountered in a horizontal well borehole, such as figure 1 Shown, including:
[0025] Step S1: Obtain pilot hole logging curves and horizontal well logging curves.
[0026] In specific implementation, the logging data required in this step includes: natural gamma and resistivity of pilot hole wells (adjacent wells), at least one logging curve that can distinguish formations; ...
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The embodiment of the invention provides an identification method for a horizontal well borehole drilling stratum. The identification method comprises the following steps that by comparing a significant to-be-identified stratum of a horizontal well logging curve with a significant actual stratum of a pilot well logging curve, and the layer number of the significant to-be-identified stratum is determined; then the layer numbers of the to-be-identified strata on both sides of the significant to-be-identified stratum are speculated; according to the speculation results, whether the layer numbers are matched with the corresponding actual layers or not is judged; if yes, the layer number of the actual stratum is determined as the layer number of the to-be-identified stratum; and if the layer number of the to-be-identified stratum cannot be judged, the stratum is set as an unknown stratum, and the other to-be-identified strata adjacent to the unknown stratum continue to be speculated and matched, and then the layer number of the unknown stratum is obtained through reverse speculation. The identification method is capable of controlling the interference of human factors effectively, matching rules can be achieved through software, and the field drilling meeting efficiency of the effective section of the horizontal well is effectively increased.
Description
Technical field [0001] The present invention relates to the technical field of formation identification. More specifically, the present invention relates to a method for identifying formations encountered by a horizontal well borehole. Background technique [0002] This section is intended to provide background or context for the embodiments of the invention stated in the claims. The description here is not recognized as prior art just because it is included in this section. [0003] Horizontal well formation background data are mainly obtained through 3D seismic. The microstructures in the local formation cannot be identified due to the resolution, which has a certain impact on horizontal well drilling. Real-time data interpretation is required during the drilling process to identify the drill bit and well. The contact relationship between the eye trajectory and the formation, and real-time adjustment of the designed well trajectory. [0004] The horizontal well borehole encounter...
Claims
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IPC IPC(8): E21B49/00
CPCE21B49/087
Inventor 陈鹏石强王秀芹肖玉峰刘凤新
Owner PETROCHINA CO LTD