Geological Data Processing for Borehole Trajectory Accuracy
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Solution Overview
Problem
Current methods for generating geological maps for oil exploration are inaccurate due to noise and ambiguity in seismic data, making it challenging to precisely navigate boreholes into thin, inclined stratigraphic zones, which are difficult to maintain during drilling operations.
Innovation Solution
A method that processes geological data by determining spatial trajectories of boreholes, subdividing offset logs, comparing sections to find error terms, and updating data to improve accuracy, using parameters like TVT %-D and TST %-D to accurately determine turning points and correct stratigraphic mapping, thereby enhancing drilling precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If seismic data processing is used to generate geological maps, then geological formations can be identified, but the maps contain noise and ambiguity that reduce drilling accuracy
Solution Approach 1:
The patent applies feedback by using actual borehole trajectory data and offset logs to iteratively correct and update the geological maps. The system compares the planned trajectory with actual borehole positions and uses this feedback to refine the stratigraphic zone boundaries and geological model, progressively improving accuracy as more boreholes are processed.
Solution Approach 2:
The patent segments the geological data processing into multiple iterative stages: initial map generation, borehole trajectory analysis, offset log comparison, error term calculation, and map updating. This segmentation allows each stage to be optimized independently and enables progressive refinement of the geological models.
2Manufacturing precision
If boreholes are drilled to access thin stratigraphic zones, then oil deposits can be targeted, but the zones are difficult to maintain due to inclination and uncertainty in spatial position
Solution Approach 1:
The patent applies preliminary action by using seismic data and geological models to pre-identify and map stratigraphic zones before drilling begins. The system calculates optimal borehole trajectories and prepares offset logs in advance, allowing the drilling operation to proceed with a clear target zone and planned path, reducing navigation complexity during actual drilling.
Solution Approach 2:
The patent introduces offset logs as an intermediary tool that bridges the gap between the geological map and the actual borehole trajectory. The offset log compares the planned path with the actual drilling path, providing a mediator that highlights deviations and enables real-time corrections to maintain precision within thin stratigraphic zones.
3Adaptability or versatility
If directional drilling techniques are used to navigate boreholes, then boreholes can be drilled in various orientations, but the complexity of navigating and maintaining the trajectory increases
Solution Approach 1:
The patent applies universality by developing a comprehensive system that handles multiple borehole orientations and complex trajectories using a unified approach. The same processing methodology works for vertical, horizontal, and inclined boreholes, as well as for different target zone configurations, making the system universally applicable without requiring separate procedures for each orientation type.
Data Source
AI summary
There is provided a method of processing geological data during drilling of a borehole for improving accuracy of the geological data. The method includes a first step of determining from instrumentation (100) associated with a string (50) of drilling pipes a spatial trajectory of a borehole (20, 200) in a subterranean region. A second step of the method involves determining from the spatial trajectory one or more points (P1, P2, P3) with reference to the geological data whereat the trajectory changes direction in one or more layers of strata (F) of the subterranean region. A third step of the method involves subdividing an offset log generated by the instrumentation (100) in response to the one or more points (P1, P2, P3) to generate corresponding sections of offset log. A fourth step involves mutually comparing the subdivided sections of offset log to find a condition of best comparison therebetween and thereby generate one or more error terms (E). A fifth step involves, in response to the one or more error terms (E), updating the geological data to improve its accuracy. Beneficially, the method includes a sixth of repeating the second to fifth steps until the one or more error terms (E) are minimized. The method is relevant for a drilling rig (40) to enhance its drilling accuracy into the subterranean region.