Efficient coring well drilling device and method for shallow sea reef limestone

Abstract

The invention discloses an efficient coring well drilling device for shallow sea reef limestone, and relates to the technical field of well drilling. The efficient coring well drilling device comprises a wire line coring drilling tool circulating system, wherein the wire line coring drilling tool circulating system comprises a top drive, a drilling tool, a gooseneck pipe, a mud pipeline and a mud pump, the drilling tool is mounted at the bottom of the top drive, the gooseneck pipe is connected to the top, and the mud pump is connected to the gooseneck pipe through the mud pipeline. The efficient coring well drilling device further comprises a reverse circulation deslagging system, wherein the reverse circulation deslagging system comprises a forward and reverse circulation change-over valve, the forward and reverse circulation change-over valve is mounted between the gooseneck pipe and the mud pipeline and can communicate with the gooseneck pipe and the mud pipeline. A reverse circulation deslagging channel is also connected to the forward and reverse circulation change-over valve, and a slurry pump is arranged on the reverse circulation deslagging channel. The invention further discloses an efficient coring well drilling method for the shallow sea reef limestone. According to the efficient coring well drilling device and method, high-quality rock cores can be obtained, rock debris accumulated in reef limestone stratum holes and drill holes can be rapidly discharged, and good in-hole conditions are created for next-time coring well drilling.

Description

technical field [0001] The invention relates to the technical field of drilling, in particular to a high-efficiency core drilling device and method for shallow sea reef limestone. Background technique [0002] Reef limestone strata are often encountered in shallow sea exploration. This kind of stratum has certain cementation but fragile structure, developed pores and fillings. It is difficult to get out of the drill hole when the cuttings are filled into the formation hole during the second drilling of coring. When the drilling is stopped, the cuttings and the filling in the hole flow back into the drill hole, which often causes the next time the core tube is not put in place, Drilling problems such as blockage of the water hole of the drill bit, failure to drill footage, and inability to obtain fresh core. [0003] It is difficult to achieve a satisfactory coring effect with a single coring technique for reef limestone formations. When drilling such formations in island a...

AI Technical Summary

Problems solved by technology

Using the above technical methods, although coring in reef limestone formations can be realized, the sand fishing process requires frequent lifting of drills, which is time-consuming and laborious, and the drilling efficiency is low; especially when drilling in shallow sea reef limestone formations, the operating period and window period of operating vessels are narrow

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