Downhole near-bit measuring sub

Abstract

The invention relates to the technical field of logging-while-drilling in oil and gas drilling operations, and relates to a downhole near-drill measuring nipple, which includes a mandrel, an electronic cylinder, an outer cylinder of a launching nipple, a nipple joint, a non-metallic sealing cover and a protective cover, and a launching nipple. The inner side of the upper end of the pup joint outer cylinder is provided with an upper installation ring platform, and the inner side of the upper part of the launching pup corresponding to the lower side of the upper installation ring platform is provided with an upper limit ring platform. The present invention has a reasonable and compact structure and is easy to use. By arranging the present invention above the drill bit, and setting monitoring equipment in the electronic compartment therein, and setting a protective cover with holes to seal the electronic devices in the receiving and sending ring groove, it overcomes the To solve the problem that the non-metallic sealing cover can transmit signals but is relatively fragile, monitoring drilling parameters at a position close to the drill bit can greatly improve the discovery rate of exploration wells and the reservoir drilling rate of development wells, especially suitable for complex formations and thin target water Hirai development has the characteristics of safety, labor saving, simplicity and high efficiency.

Description

Technical field [0001] The present invention relates to oil and gas drilling operations while drilling logging technology field, is a kind of downhole near drill bit measurement short section. Background [0002] China is rich in unconventional oil and gas resources, but unconventional oil and gas reservoirs are changeable and uncertain, and some reservoirs are thin reservoirs, marginal reservoirs and other difficult-to-use reservoirs, all of which face the problem of low reservoir drilling rate. Logging-while-drilling technology has become the main engineering technology to solve the low drilling rate of reservoirs, but due to the immaturity of some key tools and technologies in China, it is difficult to use reservoirs and unconventional oil and gas that have not been effectively developed and utilized. The traditional LWD instrument used now, the distance from the well slope and the gamma measurement point to the drill bit is about 13m, the measurement parameters are lagging be...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a downhole near-drill measuring nipple, which overcomes the deficiencies of the above-mentioned prior art, and can effectively solve the lagging of measurement parameters, inability to measure azimuth gamma, and The problem of not being able to correct the wellbore trajectory in time according to the change of the formation and the problem that the seal is not tight and easy to be damaged

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