Testing device and method for simulating flowback performance of well soaking of fracturing well

Abstract

The invention discloses a testing device and method for simulating the flowback performance of well soaking of a fracturing well. The testing device includes a fracturing fluid tank, a flowback fracturing fluid tank, a hydraulic fracturing pump, a flowback fluid collection beaker and a well soaking flowback testing system, the well soaking flowback testing system includes a box body, and an acoustic wave testing device, a temperature control device, a fracturing string and a square rock block which are arranged in the box body, a tress loading plate and a hydraulic block are arranged successively between the four surfaces of the square rock block and the inner wall of the box body, the acoustic wave testing device includes an acoustic wave transmitting probe and an acoustic wave receivingprobe, and hydraulic grooves are formed in the four outer surfaces of the box body. According to the testing device and method for simulating the flowback performance of well soaking of the fracturingwell, the situation and temperature of original crustal stress are considered, simulation of the rule of well soaking and flowback can be closer to the real situation, the flowback performance of shale under the complex joint net situation during volume transformation is further considered, and through a passive acoustic monitoring system, the flowback performance of fracturing fluid under different joint net complexity can be evaluated.

Description

technical field [0001] The invention relates to a device and method for testing the flowback performance of simulated fracturing wells and brine wells, and belongs to the technical field of hydraulic fracturing. Background technique [0002] In recent years, the effective development of unconventional oil and gas reservoirs has become a hot issue in global oil and gas development. In the commercial development of shale gas, it is necessary to pump a large amount of slick water and proppant with a large displacement to maintain the fracturing fracture. After the fracturing operation is completed, a flowback operation of about 10 days is usually required to discharge the residual fracturing fluid trapped in the fractures. It can reduce the plugging effect of fracturing fluid remaining in the fracture and its damage to the reservoir, and it is generally believed that the higher the flowback rate, the better. However, in recent years, researchers have found that the flowback ra...

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Problems solved by technology

However, a lower flowback rate does not mean that it is not conducive to later production (Wang. Is Formation Damage an Issue in Shale Gas Development? SPE149263, 2012), researchers and field engineers found (Vandecasteele, I., et al ., Impact of Shale Gas Development on Water Resources: A Case Study in Northern Poland. Environmental Management, 2015.55(6): p.1285-1299.), after the completion of fracturing, the production wells were brine for a period of time and then opened again Production, the initial production of gas is higher than that of the case of not shutting in the well, and the water production is reduced

[0003] However, there are few researches on the flowback rate test device after shale fracturing. Among them, Chen Chi's device did not take into account the complex fracture network state of shale volume fracturing (CN109490507A), and Li Wuguang's invention device (CN106596380A) although A certain fracture network can be formed, but its core can only be loaded with confining pressure and temperature, which has a certain gap with the real situation of the reservoir loaded by horizontal principal stress and vertical stress

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