E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 43/26 (2006.01) E21B 49/00 (2006.01)
Patent
CA 2448168
The invention relates to a method of controlling the production of oil or gas from a formation (1) comprising that a first and a second drilled production well (105, 110) are formed next to each other that extend essentially horizontally; that, at the drilled production wells, a further drilled well (115) is formed that extends between the first and the second drilled production well (105, 110); that the production of oil or gas is initiated; and that, while oil or gas is being produced, a liquid is conveyed to said further drilled well (115) and out into the formation (1) for a first period of time T1. The invention is characterised in that the pore pressure of the formation is influenced during the period T1 with the object of subsequently controlling the formation of fractures along a drilled well, typically across large distances in the reservoir. Such influence is accomplished partly by production in adjacent wells, partly by injection at low rate without fracturing in the well in which the fracture is to originate. Injection at low rate presupposes that an at least approximated determination is performed of the maximally allowable injection rate Imax for the period T1 in order to avoid fracturing ruptures in said further drilled well (115) when liquid is supplied by the injection rate I for the liquid supplied to the further drilled well being kept below said maximally allowable injection rate Imax for said first period of time T1 when the relation .sigma.'hole,min <=.sigma.'h has been complied with.
L'invention concerne un procédé de contrôle de la production de pétrole ou de gaz à partir d'une formation (1), selon les étapes suivantes: établissement de premier et second puits de forage (105, 110) proches, d'extension essentiellement horizontale; sur ces puits, et étendu entre eux (105, 110), établissement d'un autre puits; début de la production; simultanément, acheminement de liquide vers l'autre puits (115) et dans la formation (1) durant une première période T¿1?. On influe sur la pression interstielle durant cette période, pour contrôler ensuite la propagation des fractures le long d'un puits, généralement sur des distances importantes dans le réservoir. L'influence exercée résulte en partie de la production engagée dans les puits adjacents, et en partie de l'injection à faible débit, accomplie sans fracturer le puits dans lequel une fracture doit se produire. L'injection à faible débit suppose que l'on détermine au moins une approximation du débit d'injection maximum admissible I¿max? durant la période T¿1? afin d'éviter les ruptures par fracture dans l'autre puits (115), lorsque le liquide est acheminé selon le débit d'injection I dans cet autre puits, en-dessous du débit d'injection maximum admissible I¿max? durant la période T¿1?. Au-delà de cette période, on augmente le débit d'injection I jusqu'à une valeur supérieure à I¿max? lorsque la relation .sigma.hole,min <=.sigma.'¿h? est vérifiée.
Maersk Olie & Gas A/s
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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