Sand anchor for sea area drilling and anchor dropping and weighing method

Abstract

The invention discloses a sand anchor for sea area drilling and further discloses an anchor dropping and weighing method of the sand anchor for sea area drilling. The sand anchor comprises a sand anchor body. A plurality of clamps are arranged on anchor jaws in a knocked mode, and a plurality of counterweight balls are hung at the other ends of the multiple clamps in a one-to-one correspondence mode through a plurality of first locking chains. One ends of a plurality of second locking chains are connected to the multiple counterweight balls, and the other ends of the second locking chains areconnected with first buoys. One ends of third locking chains are connected to the top end of an anchor rod, and the other ends of the third locking chains are connected to the first buoys. According to the sand anchor, during anchor weighing, the multiple counterweight balls cooperate with the multiple clamps, the tips of the multiple anchor jaws are covered, and a subsea pipeline is effectively prevented from being damaged due to hooking of the sand anchor or broken under hooking accordingly. The anchor dropping and weighing method comprises the following steps that the operation point of a drilling ship is determined; the pipeline is marked; anchor dropping is conducted; anchor weighing is conducted; and a sand anchor ship rigging is opened, and the sand anchor for sea area drilling is dragged back to the drilling ship. According to the anchor dropping and weighing method, during anchor dropping, the subsea pipeline can be effectively prevented from being damaged by the sand anchor or a noose, and during anchor weighing, the subsea pipeline can also be effectively prevented from being damaged due to hooking of the sand anchor or broken under hooking.

Description

technical field [0001] The invention relates to the technical field of marine engineering, in particular to a sand anchor for drilling in sea areas and a method for dropping and pulling out the anchor. Background technique [0002] With the development and utilization of the coastal waters of Zhejiang, the connection between the coastal local area and the islands and reefs in the sea area is getting closer and closer. Water transportation, oil transportation, optical cables and military optical cables distributed under the submarine mud surface are generally distributed at 1-3m below the submarine mud surface. With the rapid development of the economy, more and more sea-crossing bridges between islands are being built, and more and more sea area exploration projects are involved. Sea area drilling construction is generally rented by 100-300-ton ships to anchor and locate. The bottom of the sea is mostly silt. In order to ensure the stability of the ship after anchoring, the ...

AI Technical Summary

Problems solved by technology

With the rapid development of the economy, more and more sea-crossing bridges between islands are being built, and more and more sea area exploration projects are involved. Sea area drilling construction is generally rented by 100-300-ton ships to anchor and locate. The bottom of the sea is mostly silt. In order to ensure the stability of the ship after anchoring, the anchor type with anchor blades bent inward is generally used. When the distributed pipe windlass drags the anchor, it is very easy to hook up the pipeline, damage it or break it off

In addition, due to the use of this mooring type in shallow sea areas, most of the anchor cables will sink to the mud surface of the seabed due to the operation method of the operating ship when mooring. Moreover, the general mooring type construction does not take effective protection measures for seabed facilities. , A little carelessness when anchoring or anchoring and moving the ship may easily cause damage to submarine facilities such as submarine pipelines

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