When a single development method is used to develop a deposit that is technically unfeasible or economically unreasonable, or for some reason, the deposit needs to be built in stages and developed in stages, and two or more main wells are used to open a mine field, thus forming a joint. open up. Joint development is mainly applicable to the following conditions. (1) Due to the topography or the constraints of ore and surrounding rock conditions, the deposit shall be developed jointly with the wellbore or the ramp;
(2) Since the shallow and deep parts of the deposit are staged for exploration and staged development, using the original wellbore to extend deep, or not feasible or uneconomical, a new wellbore has to be drilled in the deep part, thus forming two sections (or two Above the section) the wellbore relay is improved;
(3) The reserves and occurrences of the upper and lower parts of the deposit have a large change, so the upper and lower parts need to be developed with different well types;
(4) In the reconstruction and expansion project of the old mine, in addition to retaining or renovating the original main well, it is necessary to add new main wells of different well types, but the development system is unified.
According to the practice of mines at home and abroad, joint development is summarized as the following categories:
(1) Joint development of flat rafts and wellbore (shafts and inclined shafts);
(2) Mingjing (shaft, inclined well) and blind well (blind shaft, blind inclined well) joint development;
(3) Joint development of flat rafts, wellbore and ramps;
(4) Joint development of various major wells.
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