[특허]Formation density logging MWD apparatus

Formation density logging MWD apparatus 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01V-005/12
출원번호	US-0642314 (1991-01-15)
발명자 / 주소	Perry Carl A. (Middletown CT) Daigle Guy A. (Plainville CT)
출원인 / 주소	Teleco Oilfield Services Inc. (Meriden CT 02)
인용정보	피인용 횟수 : 44 인용 특허 : 0

초록 ▼

A measurement-while-drilling (MWD) density tool is provided which incorporates a single gamma ray source and a pair of longitudinally displaced and mutually aligned detector assemblies (i.e., dual scintillation counters). A nuclear source is mounted in a pocket in the sub wall and partially surrounded by gamma ray shielding. The subwall section adjacent the source is expanded radially so as to define a lobe which displaces mud thus reducing borehole and mudcake effects. The two detector assemblies are mounted within a cavity or hatch formed in the subwall and enclosed by a detector hatch cover under ambient pressure. The detector assemblies are fixedly spaced from the source and are also partially surrounded by gamma ray shielding to provide good formation response. The hatch cover is secured to the sub by bolts and contains radiation transparent windows therethrough in alignment with the detector assemblies. A threaded-on fluid displacement sleeve is positioned on the sub and over the detector hatch cover. This sleeve has several important functions including the displacement of borehole fluids, reducing mudcaking which might have an adverse effect on the measurement and maintaining a relatively constant formatio to detector distance. The sleeve is full gage (with respect to the borehole diameter) and includes radiation transparent windows that are positioned over the hatch cover windows in a manner which optimizes the response of the tool. The sleeve includes blades which are configured such as to provide adequate flow area in the annulus between the density sub and formation wall.

대표청구항 ▼

A formation density logging apparatus comprising: a drill collar sub having a sub wall and having opposed ends; a radioactive source in said sub; at least one detector assembly in said sub, said detector assembly being spaced from said radioactive source and said detector assembly being positioned to detect radiation resulting from gamma rays emitted by said source; at least one chamber in said sub wall for housing said detector assembly; at least one chamber cover, said chamber cover including attachment means for forming fluid tight and removable attachment to said at least one chamber, said chamber cover including at least one first radiation transparent window in alignment with said detector assembly for directing gamma rays to said detector assembly; and fluid displacement sleeve means mounted over said drill collar sub and covering at least a portion of said chamber cover, said sleeve means comprising a permanently rigid body which completely surrounds said drill collar sub, said sleeve means including at least one second radiation transparent window, said second window being aligned with said first window and said detector assembly for directing gamma rays to said detector assembly, said sleeve means displacing fluid from the vicinity of said second window.

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