Analysis of Interwell Connectivity of Tracer Monitoring in Carbonate Fracture-Vuggy Reservoir: Taking T-Well Group of Tahe Oilfield as an Example

Abstract

Carbonate fracture-vuggy reservoirs are one of the hot spots in oil and gas exploration and development. However, it is extremely difficult to describe the internal spatial structure of the fracture-vuggy unit and understand the interwell connection relationship. As a method to measure reservoir characteristics and feedback reservoir production information directly according to the detected concentration curve, interwell tracer technology provides a direct measure for people to understand the law of oil-water movement and reservoir heterogeneity and is widely used in various domestic oil fields. Based on the flow law of tracer and the CFD flow simulation basic model, this paper establishes the physical conceptual model and studies the influence of three physical parameters (the flow velocity of the fluid passing through the connected channel, diameter of the connected channel, and length of the connected channel) on the concentration curve at the outlet. In addition, the influence of different interwell connection modes on tracer concentration was studied and classified scientifically. According to the simulation, the tracer concentration curve can be classified into three types: unimodal curve, bimodal curve, and multimodal curve. Finally, the injection-production well group in the T-well area of the Tahe Oilfield is taken as an example, the connection mode between injection and production wells in this well area is further discussed and has been verified, which can be used as a reference for the connectivity analysis of similar carbonate reservoirs.

A Novel Method to Calculate Water Influx Parameters and Geologic Reserves for Fractured-Vuggy Reservoirs with Bottom/Edge Water

“…Among these carbonate reservoirs, fractured-vuggy carbonates are one of the most significant types, and they are widely distributed worldwide [5][6][7]. For example, fractured-vuggy carbonate reservoirs with large reserves have been discovered in China's Tarim Basin, such as the Harahatang area, Fumang oil field, and Shunbei oil field [8][9][10][11].…”

The Enhanced Oil Recovery Effect of Nitrogen-Assisted Gravity Drainage in Karst Reservoirs with Different Genesis: A Case Study of the Tahe Oilfield

“…The Tahe Oilfield in Northwest China is mainly a type of carbonate fracture-vuggy reservoir, which is generally characterized by deep burial, large thickness, strong heterogeneity, and multiple sets of reservoirs [1][2][3]. The karst genesis of the reservoir are various and the reservoir characteristics are complex [4][5][6].…”

Study on an Anti-adsorption Micromaterial Tracer System and Its Application in Fracturing Horizontal Wells of Coal Reservoirs

“…The technical methods for conducting staged fracturing test production profiles in horizontal wells are primarily categorized into tracer monitoring technology, production logging technology, and distributed optical fiber monitoring technology. These three technologies differ significantly in their monitoring principles, testing methodologies, and data interpretation processes; each has its own applicable conditions as well as advantages and disadvantages. − Tracer monitoring technology is a crucial technical method for testing reservoir productivity, which can be divided into chemical tracer, radioactive isotope, non-radioactive isotope, and micromaterial tracer monitoring technologies. − The technology of staged fracturing tracer testing can accurately evaluate the effective utilization of each segment, enabling calculation of the yield contribution rate for each segment. , This improves the reliability of design for exploration and development schemes, optimization of fracturing parameters, and adjustment of well spacing . Tracers must possess specific characteristics to meet requirements for tracer horizontal well staged fracturing tests .…”

“…25 , 26 This improves the reliability of design for exploration and development schemes, optimization of fracturing parameters, and adjustment of well spacing. 27 Tracers must possess specific characteristics to meet requirements for tracer horizontal well staged fracturing tests. 28 Micromaterial tracer monitoring technology has achieved the transition from qualitative to quantitative analysis.…”