CN-117554332-B - Oil-gas-water retention rate and related flow sensor

Abstract

An insulating shell is arranged on a wire-passing pressure-bearing sealing base in a sealing manner, two parallel and coaxial capacitor columns are arranged in the insulating shell, a wire passing hole is formed in the center of each capacitor column, a probe shell is arranged at the end part of the insulating shell in a sealing manner, measuring ends of two optical fibers enter from the center of the wire-passing pressure-bearing sealing base, sequentially penetrate through the wire passing hole of the two capacitor columns and the probe shell and extend out of the probe shell for a certain length, one optical fiber extending length is greater than the other optical fiber extending length, the two optical fibers are fixedly packaged in the probe shell, and lead wires are respectively connected to the two capacitor columns and penetrate out of the center of the wire-passing pressure-bearing sealing base. According to the invention, the measurement of the oil-gas-water three-phase retention rate and the flow rate of each phase is realized on the same sensor, the electrical flow and the optical fiber flow can be complemented and verified, the measurement accuracy and reliability are improved, and the correlation between the retention rate and the flow rate is stronger. The invention has the advantages of small size, simple structure, environmental protection and high precision.

Inventors

• QIAO XUEGUANG
• CHEN QIANG
• WANG RUOHUI
• GAO HONG

Assignees

• 西北大学

Dates

Publication Date

20260508

Application Date

20230816

Claims (8)

1. 1. The oil-gas-water retention rate and related flow sensor is characterized in that an insulating shell is arranged on a wire-passing pressure-bearing sealing base in a sealing manner, two parallel and coaxial capacitor columns are arranged in the insulating shell, a wire passing hole is formed in the center of each capacitor column, a probe shell is arranged at the end part of the insulating shell in a sealing manner, measuring ends of two optical fibers enter from the center of the wire-passing pressure-bearing sealing base, sequentially penetrate through the wire passing holes of the two capacitor columns and the probe shell and extend out of the probe shell for a certain length, wherein the extending length of one optical fiber is larger than the extending length of the other optical fiber, the two optical fibers are fixedly packaged in the probe shell, and a wire is respectively connected to the two capacitor columns and penetrates out of the center of the wire-passing pressure-bearing sealing base; The two parallel and coaxial capacitance columns are used for measuring the water holding rate and the liquid phase flow rate, and the two optical fibers are used for measuring the gas holding rate and the gas phase flow rate.
2. 2. The oil-gas-water retention rate and related flow sensor of claim 1, wherein the two optical fibers extend out of the probe housing less than or equal to 3mm.
3. 3. The hydrocarbon water retention and related flow sensor of claim 1 or 2, wherein the measuring ends of the two optical fibers are tapered ends, and the taper angle is 90 °.
4. 4. The oil-gas-water retention rate and related flow sensor of claim 1, wherein the end of the insulating shell, where the probe shell is mounted, is conical, the insulating shell is made of polyether-ether-ketone or glass fiber reinforced plastic, and the wall thickness of the insulating shell is less than 2mm.
5. 5. The hydrocarbon water retention and related flow sensor of claim 1, wherein the capacitive post is beryllium bronze or brass.
6. 6. The oil-gas-water retention and related flow sensor of claim 1 or 4, wherein the insulating housing is coated with an oleophobic and hydrophobic layer on the exterior surface.
7. 7. The hydrocarbon water retention rate and related flow sensor of claim 1, wherein the probe housing end is formed with an arcuate protective housing, wherein the measuring end of one of the two optical fibers is positioned within the arcuate protective housing and the measuring end of the other optical fiber extends outside the arcuate protective housing.
8. 8. The oil-gas-water retention rate and related flow sensor of claim 1, wherein the wire-passing pressure-bearing seal base is in threaded connection with the insulating housing and is sealed by a face.

Description

Oil-gas-water retention rate and related flow sensor Technical Field The invention belongs to the technical field of optical fiber sensing, and particularly relates to an oil-gas-water retention rate and related flow sensor. Background In order to ensure the high and stable yield of crude oil in the oil field in China and meet the requirements of national economic development and life improvement of people, various new methods and technologies are continuously adopted, in order to maintain stable pressure of the produced oil, the oil field is exploited by flooding oil, the high yield is realized in the early stage of development, but the later stage of development is quick in water finding, the property of the produced liquid of each layer is unknown, the exploitation is uneven, the yield efficiency is extremely fast reduced, the comprehensive water content is over 80 percent, such as a long-day 'three low' oil field, the water content is up to 90 percent, and the single well yield of 80 percent is lower than 5 sides/day. The effective recovery rate is less than 30%, and more than 70% of crude oil becomes residual oil. In order to improve the development efficiency of the residual oil, through logging means such as multi-parameter logging of small-diameter annular liquid production, multi-parameter logging stored through an oil pipe, horizontal well flow imaging logging, intelligent layering monitoring and the like, parameters which continuously change in a development well are accurately obtained, professional interpreters are combined with information such as geology, exploration logging, perforation, fracturing, water injection and the like, wellbore connectivity and interlayer contradiction are comprehensively analyzed, residual oil evaluation is carried out, a main force layer and a potential layer are identified, and an optimized development system and measures are formulated for upper production stability and residual oil development. Wherein the water holding rate, gas holding rate, liquid phase flow rate and gas phase flow rate of the shaft section are core parameters. Common water retention sensors include capacitance sensors, electromagnetic wave water retention meters, microwave water retention meters, impedance sensors and sampling sensors, gas retention is usually measured by radioactive substances, and common flow sensors include GR tracer sensors, turbine flow sensors, ultrasonic flow sensors, electromagnetic flow sensors. However, the common water retention and flow sensors are independent sensors with single parameters, the integration level is not high, the structure is complex, the volume is larger, the miniaturized design of an annular liquid production profile instrument and the probe array design of an imaging instrument are not facilitated, the method is also not suitable for a layered oil extraction measurement and control instrument for long-term continuous monitoring, the maintenance is not facilitated, the flow measurement scheme is only suitable for special single-phase flow or large flow, the method is easily influenced by underground debris particles and thick oil, the measurement of the gas retention rate by radioactive chemical substances is not environment-friendly, the oil field operation is difficult to examine and approve, the cost is high, the flow measurement limitation is larger, the electromagnetic ultrasonic flow is suitable for single-phase flow, the turbine flow is easily blocked by sand, 4) the oil gas water retention rate and the flow are measured by independent different sensors, the measurement points are not in the same position, and the correlation of the retention rate and the flow is not strong. Aiming at the limitations of the common water holding rate, gas holding rate, flow measuring method and sensor, the oil-gas-water holding rate and related flow sensor are urgently needed at present, and accurate measurement of the three-phase flow data of the oil-gas well water holding rate, the gas holding rate and the oil-gas-water is realized. Disclosure of Invention The invention aims to overcome the defects of the prior art and provide the oil-gas-water retention rate and related flow sensor which has small volume, high integration level, simple structure and high accuracy and can realize the measurement of the oil-gas-water three-phase retention rate and the flow rate of each phase on the same sensor. The technical scheme includes that an insulating shell is arranged on a wire passing pressure-bearing sealing base in a sealing mode, two parallel and coaxial capacitor columns are arranged in the insulating shell, a wire passing hole is formed in the center of each capacitor column, a probe shell is arranged at the end portion of the insulating shell in a sealing mode, measuring ends of two optical fibers enter from the center of the wire passing pressure-bearing sealing base and sequentially penetrate through the wire passing hole of each capacitor column and