BRIDGEFORM provided innovative alternative for wellbore strengthening The Tsimin-Xux oil field off the coast of Mexico presents a number of technical challenges due its complex formations and high-pressure, high-temperature (HP/HT) environment (more than 10,000 psi [68,947 kPa] and 340°F [171°C]). The narrow mud window through the wellbore and the low- pressure, high-permeability sandstone and shale layers required help to reduce pore pressure, improve lubricity, and maintain borehole stability. In the initial stage of the project, a 26-in. section of the Tsimin 74 well was drilled from 656 to 3,609 ft (200 to 1100 m) with a potassium chloride polymer water-based mud (WBM). The last 492 ft (150 m) of the section crossed a low-pressure, high-permeability sandstone that caus

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