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'In offshore Mexico, operators have increased workover activity to maintain oil and gas production. The range of well intervention is extensive, from mature fields completed with large production tubulars to high-pressure/high-temperature (HPHT) developments with shut-in surface pressures up to 8,500 psi. This is becoming a particularly challenging environment for conventional workover intervention practices. Consequently, the demand for innovative cost effective slickline (SL) solutions for these wells has driven manufacturers and service companies to extend the traditional operational boundaries for slickline such as the implementation of real time telemetry for downhole parameters, thus the Digital Slickline (D-SL) was developed and also with through-tubing services, such as SL-deployed through-tubing inflatable-packers (SLD-TTIP). In applications such as removal of the Christmas tree, a secondary barrier for insurance the well control it is needed by operator standards. The operator conventional method involves to kill the well by pumping heavy mud, activate the Sub Surface Safety Valve (SSSV) and install the ‘H” Valve (safety plug) at the tubing hanger. This process implies the cost of the killing fluid and mud boat. However, additional risks are expected such as to damage the matrix with the mud, which leads to expensive stimulation treatments; and also the need to lift the well and retrieve that mud to surface thus the intervention presents a significant cost increase. Recently, the Cantarell asset implemented the use of D-SL and TTIP to set a temporary pressure barrier and allow in safe manner to perform a tree removal or maintenance without the need to kill the well with mud. This paper provides a technical analysis of the engineering process required to develop successful SLD-TTIP interventions in shallow depths. This analysis considers packer inflation technique, differential pressure limits, tension forces required for packer deflation and disconnection, recommended downhole tool assembly configuration, and treating fluids. The document also presents a case history, lessons learned, conclusions and recommendations from the experiences gained while performing temporary pressure barrier operations in Cantarell Field.

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'El campo Sihil está ubicado en aguas territoriales de la plataforma continental del Golfo de Mexico, al oeste de la Península de Yucatán y 87 km al noroeste de Ciudad del Carmen Campeche. Los pozos que pertenecen a este campo presentan un alto índice de dificultad durante su perforación representado en la presencia de zonas de perdida totales de circulación en dos de las secciones del pozo, presencia de lutitas reactivas, cuerpos calcáreos de mediana compresibilidad, estos riesgos son resumidos en la figura 1.1, No obstante los riesgos y en grado de complejidad de los pozos en este campo se hace redituable la perforación en este campo puesto que se han convertido en los mayores productores en toda el área de Cantarell.

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