Process and device for installing seismic sensors inside a petroleum production well
AssigneeInstitut Francais du Petrole
InventorsChristian Wittrisch, Jean Laurent, Charles Naville
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Abstract
A process for installing seismic sensors inside a petroleum production well equipped with a cemented casing involves arranging the seismic sensors along an outer surface of the casing before being descended into a drilled well and cementing a ring-shaped space between the casing and the well so as to acoustically connect the sensors to geological formations. The sensors and transmission cables which link them to the surface are secured to centering devices guiding the descent of the casing or to the casing outer wall, possibly by means of a coating of damping material. The sensors may be inserted into sleeves secured outside the casing.
Claims14
A process for installing seismic sensors inside a wellbore which is equipped for production of petroleum fluids and which includes a casing embedded into the wellbore by cementation, which comprises disposing seismic sensors outside the casing between the casing and sidewalls of the wellbore before cementation, and embedding the seismic sensors into the cement during cementation whereby said seismic sensors are coupled by cement to surrounding geological formations to enable seismic monitoring of the production of the well.
A process for installing geophones or accelerometers inside a wellbore which is equipped for production of petroleum fluids and which includes a casing embedded into the wellbore by cementation, said process comprising disposing said geophones or accelerometers outside the casing and embedding the geophones or accelerometers into the cement which ensures bedding of the casing.
A process for coupling seismic sensors with geological formations surrounding a wellbore which is equipped for production of petroleum fluids and which includes a casing embedded into the wellbore by cementation, said process comprising disposing said seismic sensors outside the casing and embedding the seismic sensors into cement during cementation of said casing.
Dependencies are inferred from the claim text.