A Review of Casing Drilling Advantages to Reduce Lost Circulation, Augment Wellbore Strengthening, Improve Wellbore Stability, and Mitigate Drilling-induced Formation Damage

Plastering Effect of Casing Drilling; a Qualitative Analysis of Pipe Size Contribution

Formation Damage and Fluid Loss Reduction due to Plastering Effect of Casing Drilling

Steering control algorithm plays an important role in a rotary steerable system for horizontal well drilling, including the determination of the well trajectory, vibrations, stability, durability among other variables. This work develops a control algorithm for three static push-the-bit rotary steerable systems (RSSTSP) (TSP is the abbreviation of “three static push-the-bit”). Based on the structure, mechanism, and working process of the RSSTSP, mechanical and mathematical models are proposed to determine the required steering force (amplitude and direction) to move the drill bit from a point to another.
 Additional equations are constructed to overcome the non-uniqueness and then compute the optimal forces for the three pads to achieve the required steering force. Moreover, a new control algorithm of RSSTSP is developed, considering the steerability, stability, durability, favorable area, unfavorable area, maximum usable magnitude of steering force. The proposed control algorithm is also applied to a new RSSTSP and tested on a GU-693-P102 well for validation. It is found that each pad force changes smoothly, the drilling tool is stable, and the well trajectory is consistent with the design, demonstrating that our proposed control algorithm is robust and effective for RSSTSP for horizontal well drilling.

/pdf/analysis-and-optimization-of-control-algorithms-for-rsstsp-3k64puunfr.pdf

Analysis and optimization of control algorithms for RSSTSP for horizontal well drilling

Earth models are important tools for support of decision making processes for optimal exploitation of subsurface resources. For geosteering and other real-time processes where time is a major constraint, effective model management is decisive for optimal decision support. During drilling, subsurface information is received which should optimally be used to modify the 3D earth model. Today this model is typically not altered during the operation. We discuss the principles of a novel method that enables a populated earth model grid to be locally modified when the topology (connectivity) of the geological structure is locally altered. The method also allows local updates of the grid resolution. The modelled volume is split into closed regions by the structural model. Each region is individually discretized and obtains its own subgrid. Properties are stored in separate functions, e.g. for each layer, and transferred into each subgrid via a mapping. A local update of the geological structure implies that only subgrids in regions that are directly affected by the updated structure must be discarded and rebuilt, and the rest of the populated earth model grid is retained. Our focus is on decision support for optimal well placement while geosteering. The proposed method aims to manage multiple model realizations that are never fixed and always locally updated with the most recent measurements and interpretations in real-time, and where each realization is always kept at an optimal resolution.

/pdf/a-novel-method-for-locally-updating-an-earth-model-while-3ws6232tjn.pdf

A Novel Method for Locally Updating an Earth Model While Geosteering

Well Placement and Reservoir Characterization Challenges on Peregrino Mitigated by Development of Extra-Deep Azimuthal EM Technology

Development of a Smart Flow Diverter

Field Testing and Applications of a Smart Flow Diverter

A method of perforating a tubular (1) located in production zone of a well (4), wherein the tubular (1) comprises a first material and a second material, wherein the first material is more resistant to corrosion than the second material, the method comprising applying an electric current to the tubular (1) in the presence of an electrolyte, whereby at least some of the second material is removed by a corrosion process to leave a structurally intact but perforated tubular. The tool (6) is configured to cause an electrical current to flow through the tubular (1) through an electrode (12) of the tool in contact with the tubular in the presence of an electrolyte (9).

A method of perforating a tubular, a tubular and a tool therefor

A sub for connection into a drill string. The sub comprises an upper body and a lower body, and is configured so that torque can be transferred from the upper body to the lower body. The upper and lower bodies are axially coupled by means of an axial coupling that is arranged to fracture when placed under a predetermined tension. Once fractured, the upper body can be separated from the lower body. The axial coupling is substantially isolated from said torque.

Downhole apparatus recovery

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