Old well potential tapping process for old mining area of rock salt

Abstract

The invention discloses an old well potential tapping process for an old mining area of rock salt. The process comprises the following steps: newly building a multi-branch horizontally butted well tobe communicated with salt cavities or horizontal sections of multiple old well groups with production reduction or shutdown at present for brine mining, monitoring and controlling the well track by using a clinometer during drilling of the vertical well section of the multi-branch horizontal well, controlling the well deflection azimuth by adopting a clinometer and a single-bend helicoid hydraulicmotor in the building-up section drilling process, adjusting the azimuth after getting round of old cavity or a roof blowby area towards a salt layer downdip direction, and drilling towards a buttedtarget well, and therefore, the safety drilling is facilitated, the salt control area is enlarged, and the brine production and brine density are increased.

Description

technical field [0001] The invention relates to the technical field of rock salt drilling, in particular to a technology for tapping the potential of old wells in old salt layer mining areas. Background technique [0002] The mining status and existing problems in the old rock salt mining area mainly include: (1) well layout is unreasonable, and the leftover area between wells is large; (2) the salt layer roof and the dissolution cavity are connected in a large area, resulting in low brine concentration and high production cost of salt chemical industry; (3) The recovery rate is low, generally lower than 30%; (4) Vertical well single well convection, horizontal butt well and other mining methods are adopted, and the service life of single well is short; (5) The cementing quality is unqualified and casing perforation leads to environmental pollution . [0003] In view of the above problems, the conventional potential mining methods in old mining areas include: (1) open the w...

AI Technical Summary

Problems solved by technology

After adopting the above-mentioned potential tapping technology, although the production and concentration in the early stage of mining have been improved to a certain extent, the stable production period is short, and there are the following problems: (1) It is easy to re-plug after the well is opened; (2) After the window is sidetracked, it is repaired later (3) The physical method is still in the early stage of development and immature; (4) The production cost of oil cushion horizontal well is high and the pressure of environmental protection is great

Now the most commonly used is the branched horizontal well, that is, the new branched horizontal well is connected to multiple docking target wells for mining. Compared with the previous methods of tapping potential, the effect of the branched horizontal well is more obvious. In the complex situation of area connectivity, severe water gushing will make it difficult to drill the branched horizontal well normally; the branched horizontal well with long horizontal section will have serious underpressure, which will also make drilling difficult

Images