A high-efficiency coring drilling device and method for shallow sea reef limestone

Abstract

The invention discloses a high-efficiency coring drilling device for shallow sea reef limestone, relates to the field of drilling technology, and includes a wireline core drilling tool circulation system, which includes a top drive, a drilling tool, a gooseneck, Mud pipeline and mud pump; drilling tools are installed at the bottom of the top drive, gooseneck is connected to the top, and the gooseneck is connected to the mud pump through the mud pipeline; it also includes a reverse circulation slag discharge system, which includes positive and negative circulation conversion The positive and negative circulation switching valve is installed between the gooseneck and the mud pipeline, and the positive and negative circulation switching valve can be connected with the gooseneck and the mud pipeline; A slurry pump is arranged on the slag channel. The invention also discloses a high-efficiency core drilling method for shallow sea reef limestone. The invention can obtain high-quality rock cores, and can quickly discharge the rock cuttings accumulated in the pores of the reef limestone formation and the boreholes, and create good conditions in the boreholes for the next round of core drilling.

Description

technical field [0001] The invention relates to the technical field of drilling, in particular to a high-efficiency coring drilling device and method for shallow sea reef limestone. Background technique [0002] The reef limestone stratum is a stratum often encountered in shallow sea exploration. This kind of stratum has certain cementitious but fragile structure, and has developed pores and fillings. When the core is drilled again, the cuttings are filled into the formation holes and it is difficult to return to the hole. When the drilling is stopped, the cuttings and the fillings in the holes flow back into the hole, which often causes the next core pipe to be not placed in place, Drilling problems such as blocking the water hole of the drill bit, burning the drill, and unable to obtain fresh cores. [0003] It is difficult to achieve satisfactory coring results in reef limestone formations using a single coring technique. In the exploration of islands and reefs, the rop...

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

Images