oa Drilling the Longest Horizontal Well in the History of Kuwait Using State of the Art Technologies

The Minagish field, in West Kuwait, is a North-South trending asymmetrical anticline, dipping from east<br>to west with hydrocarbons contained in six major reservoirs ranging in age from Early Jurassic to Late<br>Cretaceous. Mishrif is a tight, fractured carbonate reservoir of Upper Cretaceous age developed in a<br>shallow marine deposition environment. The observed porosity in the upper reservoir layers ranges<br>between 10-30%. The permeability measured from vertical wells is less than 17 milli Darcy. The<br>second Mishrif layer is a fairly high porous peloidal packstone to grainstone sequence, composed of<br>several mechanical sub-layers, mostly fractured and vuggy at the upper 15 feet “dual porosity<br>system”. Production from this particular layer is related to the degree of fracture clustering, corridors<br>and open faults which enhancing the permeability of the layer, thereby making it a good potential for<br>horizontal well placement.<br>A high geological risk in horizontal drilling is coming from the formation dip uncertainties, which were<br>expected to vary between 2.5-3 deg upward up to 4-5 deg downward, with an intensity increase close<br>to the highly faulted areas. Due to the well complexity and uncertainties expected in real time drilling,<br>the LWD tools selection for the lateral section were based on providing in real time solutions from deep<br>directional measurements and inversion from the distance to boundary tool primarily and the formation<br>dip information, fractures and faults identification from the resistivity images. In addition, other tools<br>selected provide the basic petrophysical measurements such as Gamma Ray, Resistivity and Density-<br>Porosity logs.<br>The company achieved a landmark in horizontal drilling with its third Mishrif horizontal well. The<br>horizontal section at a length of 5312 feet was geo-steered in the sweet spot of the upper- most part<br>of the Mishrif layer 2 (about 5-10 feet thick) using the most advanced technologies and high-resolution<br>Q-seismic data.