A degasser for gas logging based on semi-permeable membrane

Abstract

The invention relates to a degasser for gas logging based on a semi-permeable membrane and belongs to the technical field of oil and gas exploration. The degasser comprises a housing, a conical spiral oil and gas separator and a transmission device, wherein the housing comprises an outer shell and a partition, the front end of the outer shell is open for allowing drilling fluid to enter, symmetrical liquid-discharging openings are formed in the rear edge at a position where the radius of the outer shell is maximum, and the outer shell is divided into a front cavity and a rear cavity by the partition; the conical spiral oil and gas separator positioned in the front cavity consists of a hollow shaft and three spiral blades; the inside of each spiral blade is hollow, the spiral blade is communicated with a gas collecting chamber in the hollow shaft, embedded membrane structures are densely distributed on the front surface and the rear surface of the spiral blade, and each embedded membrane structure is formed by embedding the semi-permeable membrane in a regularly-hexagonal ring-shaped boss; the conical spiral oil and gas separator is fixedly connected with a rotating shaft, and the other end of the rotating shaft is connected with a speed reducing motor through a coupling, a gas passage inside the rotating shaft is connected with a carrier gas inlet pipe and a sample gas outlet pipe through a sleeve. According to the degasser provided by the invention, the service life of the device can be effectively prolonged, the oil and gas separation efficiency, the gas logging precision and the accuracy are significantly improved, and the work is reliable.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploration, and in particular relates to a degasser for gas logging based on a semipermeable membrane. Background technique [0002] 1. At present, oil and gas separation is mainly realized by electric degasser or pneumatic degasser. This degassing method is greatly affected by drilling fluid temperature, liquid level height and viscosity. Technical bottlenecks with low accuracy of evaluation. The semi-permeable membrane has a certain separation selectivity for hydrocarbon components, and can separate oil and gas to obtain gaseous and liquid hydrocarbon components at room temperature. Compared with electric or pneumatic degassers, it has fewer influencing factors and can quantitatively evaluate oil and gas. content advantages. [0003] 2. Drilling fluid has the characteristics of high temperature, high pressure, and carrying sediment. These factors will cause certain damage to the semi-perm...

AI Technical Summary

Problems solved by technology

[0003] 2. Drilling fluid has the characteristics of high temperature, high pressure, and carrying sediment. These factors will cause certain damage to the semi-permeable membrane and reduce the service life of the degasser.

Images