A two-to-one docking well structure design and well arrangement method

Abstract

The application relates to the technical field of middle-deep downhole heat exchange, and discloses a two-to-one butt joint well structure design and well arrangement method, which comprises an inclined well, a directional well one is communicated with the left side of the inclined well, a directional well two is communicated with the right side of the inclined well, and the top ends of the inclined well, the directional well one and the directional well two are all provided with sealing hangers. First, group well space layout design is carried out, a ground well mouth of the inclined well, the directional well one and the directional well two is arranged in a ground site in a centralized manner, and wellbore trajectories of the inclined well, the directional well one and the directional well two respectively drilling into the underground in a directional manner are planned. By constructing a two-to-one well body structure communicated with each other at a deep underground position of the inclined well, the directional well one and the directional well two, injected heat exchange medium can form a two-injection-one-recovery physical converging corridor in a deep formation, the effective heat exchange area of a system in the underground can be increased, and therefore the comprehensive heat extraction capacity of a single group of geothermal wells is remarkably improved.