A method and equipment for directional advancing mining in a salt well solution cavity

Abstract

The invention discloses a method for directional advance mining in a salt well dissolution cavity and equipment thereof. The equipment comprises a guiding shoe hanging tubular column (7), a hanger (4), a whipstock (6), a soluble plug sealing assembly (8), a soluble check valve (13), a guide oil tube (12), a balancer (9), light oil (11) and a guiding shoe (14), wherein the guiding shoe hanging tubular column (7) is in sealed connection with a sleeve through the hanger (4); the lower end of the guiding shoe hanging tubular column (7) is provided with the whipstock (6); a production tubular column penetrates through the guiding shoe hanging tubular column (7) and comes out of the whipstock (6); the soluble plug sealing assembly (8) and the soluble check valve (13) are located at the two endsof the guide oil tube (12) respectively, the soluble plug sealing assembly (8) is located at the end, connected with a production oil tube, of the guide oil tube (12); the balancer (9) is fixed on thetube wall of the guide oil tube (12); the guide oil tube (12) is filled with the light oil (11); and the guiding shoe (14) is connected with the guide oil tube (12). The method for directional advance mining in the salt well dissolution cavity and the equipment thereof have the advantages that in a salt mine zone with low recovery efficiency, dissolution and forward advance are carried out simultaneously, a new dissolution cavity passage is formed, so that the economic benefit of a brine well restores, and security incidents caused by the collapse of a dissolution cavity top plate are avoided.

Description

technical field [0001] The invention relates to the technical field of drilling and production, in particular to equipment and a method for directional propelling and mining in a salt well dissolution cavity. Background technique [0002] Well group connected water-soluble mining technology is the advanced technology of salt well water-soluble mining at present. High initial output and high resource utilization. However, with the continuation of mining, the salinity continues to decrease. When the salinity is so low that there is no economic value for mining, static solution intermittent mining or the method of reducing the hourly flow rate is often used to meet the minimum requirement of salinity. At this time, the salt well has almost lost the value of mining. [0003] At the same time, in the later stage of mining, with the continuous increase of the surface area of ​​the solution cavity, the roof or interlayer of the salt well solution cavity is continuously exposed. W...

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Problems solved by technology

At this time, the salt well has almost lost the value of mining

[0003] At the same time, in the later stage of mining, with the continuous increase of the surface area of ​​the solution cavity, the roof or interlayer of the salt well solution cavity is continuously exposed. When the exposed span of the roof and interlayer reaches the pressure of the overlying formation, there is a risk of the roof collapse of the solution cavity. , and it is very likely to cause the upper leakage layer to be connected to the surface, and a large amount of brine will leak out, resulting in serious environmental pollution and a vicious accident in which the brine well will stop production

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