Drilling sleeve and large well -eye multi -branch well -branched well quickly drilled well

Abstract

The invention discloses a drilling casing, which comprises a casing wall and several sand control devices arranged at intervals on the casing wall, each sand control device includes a sand control net, a sealing steel sheet and a sealing rubber plug, and the sand control net is arranged with A plurality of sand control screen holes parallel to each other, the sand control screen holes are facing the sealing steel sheet, and the sand control mesh and the sealing steel sheet are connected by steel pins. The invention also discloses a fast drilling and completion method for multi-branch wells with large boreholes by using the drilling casing. The present invention uses a large-sized drill bit to drill to the target well depth at one time to form the main wellbore, and then uses the drilling casing to drill branch wellbores in the natural gas hydrate reservoir, and then takes out the drill bit to complete the well, which is suitable for various natural gas hydrate exploitation This method can greatly increase the production and recovery of hydrate wells, and integrate drilling and completion, shorten the drilling and completion cycle, save a lot of manpower and material resources, and effectively prevent sand at the same time.

Description

technical field [0001] The invention relates to the technical field of natural gas hydrate exploitation, in particular to a drilling casing and a rapid drilling and completion method for a multi-lateral well with a large borehole using the drilling casing. Background technique [0002] Gas hydrate is an ice-like solid formed by natural gas and water under certain temperature and pressure conditions, commonly known as combustible ice, which is mainly distributed in the sediments at 0-1100m below the seabed on the continental margin. Because of its wide distribution, huge reserves, and high energy density, natural gas hydrate has broad development prospects as a potential energy source that can replace traditional fossil energy sources. [0003] At present, the mining methods of natural gas hydrate mainly include: heat transfer stimulation mining method, decompression mining method, chemical reagent injection method, carbon dioxide replacement method, solid-state fluidization ...

AI Technical Summary

Problems solved by technology

Due to the complex formation and geological conditions of natural gas hydrate deposits, the mechanical properties of hydrate-bearing formations will change during the drilling, completion and gas production of these methods, and the problem of sand production is particularly serious. The overlying stratum is loose and often collapses, affecting the progress of the construction period, resulting in a long drilling and completion period, time-consuming and laborious, and has become an urgent problem that restricts the safe and efficient production of natural gas hydrates.

[0004] After searching the existing technical patent documents at home and abroad, it is found that there is no patent related to drilling and completion technology that completely solves this problem

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