Filtration plugging testing apparatus and simulation method for process of fracture temporary plugging by ice crystals

Abstract

The invention relates to a testing apparatus and a simulation method for testing of fracturing liquid filtration and ice crystal plugging capacity of oil-gas field development research labs during the process of fracture temporary plugging by ice crystals. The technical scheme includes that the testing apparatus comprises four units including a fracture simulation unit, a rock core freezing unit, a fracturing liquid circulation and measurement unit and a temperature and pressure monitor and control unit. An upper hole of the fracture simulation unit is communicated with an inner chamber of the rock core freezing unit, a liquid inlet is reserved on the left side, a side cover is connected to the right side, and a liquid outlet is reserved at the center of the side cover. The inner chamber of the rock core freezing unit is a low-temperature-resistant core rock sleeve, a liquid inlet-outlet hole is reserved on the outer wall and is connected with a hand pump, and an outer chamber is connected with a refrigerator. A liquid storage tank of the fracturing liquid circulation and measurement unit is connected with a high-pressure constant-flow pump and then is connected with the fracture simulation unit, and an outlet pipeline extends into a beaker which is placed on an electronic scale. Temperature probes are mounted in the inner chamber and simulated fractures, and liquid outlet ends of the hand pump and the high-pressure constant-flow pump and a liquid outlet hole of a push rod are connected with pressure gauges respectively. Mechanization and automatization degree of the testing apparatus are increased, and simulation tests are safe and quick and accord with real environments of reservoirs well.

Description

technical field [0001] The invention relates to a test device and a simulation method for fracturing fluid filtration loss and ice crystal plugging capacity used in an ice crystal temporary plugging fracturing process in an oil and gas field development research laboratory. technical background [0002] Hydraulic fracturing is one of the important stimulation techniques for oil and gas field development. When fracturing oil and gas reservoirs with high permeability and well-developed fracture network, the fracturing fluid fluid loss is serious, and sand plugging is prone to occur, requiring low sand ratio and high displacement construction, resulting in long flowback time and deepening damage to the formation. And crack height is difficult to control, increases the danger of construction simultaneously. The ice crystal temporary plugging fracturing technology freezes the formation water before fracturing, and uses solid water, that is, ice crystals for plugging, so as to re...

AI Technical Summary

Problems solved by technology

[0003] At present, all indoor research devices are designed for fracturing fluid fluid loss under normal temperature or high temperature conditions, and the electric heating method is not suitable for fluid loss experiments under negative temperature conditions, and cannot realize the temperature detection and monitoring of key positions in the experiment. adjustment, and the optimization of cooling capacity and fracturing fluid flow cannot be realized

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