Landing method of submarine pipeline in offshore petroleum engineering construction process

Abstract

The invention discloses a landing method of a submarine pipeline in the offshore petroleum engineering construction process. The directional drill crossing and back-hauling technology is adopted to achieve landing of the submarine pipeline. The construction process comprises the following steps that directional drill equipment mounting and debugging are conducted, guide holes are drilled from theland to the seat, the lithosphere is thoroughly drilled, a drill bit is pulled back from the soil entering position, forward pushing and progressive reaming is conducted, the drill bit is unearthed from the bottom of the sea, the drill bit is withdrawn, forward pushing and progressive reaming of the covering layer (the claypan and the sludge layer) is conducted, the reaming drill bit is connectedwith an upper pipe-laying ship, the drill bit is removed, and a pipeline is connected, the pipeline is prefabricated on the pipe-laying ship, and backhaul is started, and after backhaul, relative detection is conducted. The directional drill crossing and back-hauling technology is adopted to conduct landing of the submarine pipeline, construction difficulty of a normal landing mode of the submarine pipeline is effectively reduced, original equipment and the environment are effectively protected, construction working amount is greatly reduced, the construction period is obviously shortened, andthe construction cost of the whole engineering project is lowered.

Description

technical field [0001] The invention relates to the field of offshore oil engineering, in particular to a method for landing a submarine pipeline during the construction of an offshore oil project. Background technique [0002] Submarine pipelines refer to pipelines that transport media between offshore facilities and between offshore facilities and land terminals. The conventional landing method of submarine pipelines is: pre-excavation, dragging and backfilling protection of submarine pipelines in the landing section. The technical background and technical status and existing problems are as follows: [0003] 1. The landform near the shore of the landing section is complex and the sea conditions are relatively bad (high wind level and large turning waves), which will bring great difficulties to the pre-drilling operation of the submarine pipeline in the landing section. [0004] 2. It is close to the existing submarine umbilical cable and other facilities, and the rear pr...

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Problems solved by technology

[0003] 1. The landform near the shore of the landing section is complicated and the sea conditions are relatively bad (high wind level and large turning waves), which will bring great difficulties to the pre-drilling operation of the submarine pipeline in the landing section

[0004] 2. It is close to the existing submarine umbilical and other facilities, and the protection of the existing submarine umbilical and other facilities needs to be removed, and there is a certain construction risk for the safety of the existing submarine umbilical and other facilities

[0005] 3. The pre-digging operation of the submarine pipeline, the post-protection removal operation and backfilling protection operation of the existing submarine pipeline and other facilities have a large amount of total engineering work and a large investment in construction resources, which will greatly increase the implementation cost of the entire project; and The long construction period will affect the subsequent construction completion plan of the entire project

[0006] 4. The pre-digging operation of the submarine pipeline, the post-protection removal operation and backfill protection operation of the existing submarine pipeline and other facilities will destroy the existing related facilities and the original environment, etc., and will be more destructive

[0010] After a patent search, no technical content similar to the present invention about the directional drilling and pulling back of submarine pipelines was found

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