Light hydrocarbon ananlysing method for detecting rock fragments

Abstract

The invention discloses a bore meal detecting light hydrocarbon analysis method. It manages and controls through computer, and runs degassing system program (vacuumizing, forming degassing space, degassing, collecting gas process, and degases from bore meal) and detecting analysis system program ( detecting gas groups, A / D transferring, data collecting, and data dealing, displaying and printing gas groups). The invention applies the logging light hydrocarbon group method in earth logging. The invention solves the difficult problem of evaluating hydrocarbon reservoir method, because of using PDC aiguille, in traditional earth logging detecting method; and achieves the interlocking logical controlling of complex controlling loop and optimum controlling in program step control by the usage of computer, makes the whole process, including degassing, collecting gas, sending gas and measure, be full automatic, conquers all kinds of faults of traditional manual operation, completely removes man made factor and air influnces.

Description

【Technical field】 [0001] The invention relates to petroleum and natural gas geological exploration and analysis instruments, in particular to a method for detecting and analyzing light hydrocarbons in cuttings. 【Background technique】 [0002] In the geological exploration of oil and gas, geochemical logging and gas logging technology are the most important logging techniques. Since the 1950s, despite decades of development, whether it is the SQC-701, SQC-882 gas logger, or the SK-2000, SDL-9000 comprehensive mud logger, the process of collecting information is different. The components of the gas separated by the degasser are analyzed, and the oil and gas layers are further judged, identified and evaluated based on these data. [0003] With the revolution of drill bit technology, artificial polycrystalline diamond compact drill bits (PDC for short) are used in all oil fields, and PDC bits have brought huge problems to the mud logging industry. Due to the special rock-breaki...

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Problems solved by technology

[0003] With the revolution of drill bit technology, artificial polycrystalline diamond compact drill bits (PDC for short) are used in all oil fields, and PDC bits have brought huge problems to the mud logging industry. Due to the special rock-breaking mechanism of PDC bits, drilling cuttings are very fine. (approximately powdery), coupled with the extremely fast drilling speed, has brought many difficulties to mud logging: cuttings collection is difficult, or even cuttings cannot be collected; lithology identification is difficult, and it is difficult to effectively divide reservoirs and non-reservoirs. It is more difficult to divide the lithology carefully; the cuttings are so small that it is extremely difficult to pick samples on site, and the sampling task cannot be completed, which affects the results of geochemical analysis and geological sampling results; the information of reservoir oil and gas stored in the cuttings is greatly reduced, reducing The level of oil and gas shows increases the difficulty of oil and gas show identification and evaluation; the drilling speed is extremely fast, and the traditional long-period chromatographic analysis technology is difficult to achieve meter-by-meter analysis; Difficult to identify false display

Due to the combination of the above comprehensive factors, the traditional geochemical logging method for detecting and evaluating oil and gas layers fails

[0004] At present, there are different manufacturers and different types of degassers, but there are different problems. For example, the United States International Logging Company and the French Geological Services Company are equipped with drilling cuttings degassers (Cuting Gas) with their comprehensive mud logging instruments. However, the degasser only stirs the cuttings at a high speed at room temperature and works under normal pressure, so it is difficult to release all the gas absorbed in the cuttings.

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