Recently, a new type of annular adjustable jet pump successfully designed by HB-YL202 fracturing team of North China Petroleum Administration Underground Operation Company succeeded in declaring a national utility model invention patent. The pump can both acid and can be equipped with fracturing fluid on the pump head less demanding on-site implementation of the operation quick and easy, effectively shortening the on-site dosing time, speeding Daniudi gas field fracturing progress. After years of mining, the recoverable reserves of Daniudi Gas Field have been effectively exploited, but a large number of reservoirs with difficult reserves have the characteristics of tight reservoir, strong heterogeneity and difficult exploitation. Under the new situation, the potential for the gas field to achieve a steady and steady production of 10 billion cubic meters is precisely contained in the difficult-to-use reservoirs. Natural gas that is difficult to use in reservoirs will fall asleep in reservoirs without fracturing. In recent years, horizontal well fracturing in the Daniudi gas field and multi-layer partial pressure fracturing techniques such as vertical wells have been widely used. However, a large amount of fracturing fluid needs to be prepared before the fracturing construction, Jet pump is a key component, which uses jet principle, the pump pump out of water and powder mixing, the structural design determines the choice of what type of pump. At present, the domestic preparation of fracturing fluid at the scene: First, the use of three-cylinder plunger pump with the center nozzle jet device dosing, the application of the jet pump performance of a single, different places, to use a different jet pump, especially in the gas field application , Different stages of different process requirements have a lot of inconvenience. There are many shortcomings such as unstable displacement, pipeline jitter, no safety guarantee, heavy labor intensity, complicated maintenance and energy waste. Second, the use of centrifugal pump with jet device to achieve the preparation of fracturing fluid, jet device nozzle is not adjustable, displacement changes, the need for multiple jet device, and sometimes need to jet pump on the fracturing fluid tank, the need for high-lift Centrifugal pumps, increasing the workload, the operation is very inconvenient. The design of the novel annular adjustable jet pump overcomes the defects of poor dosing effect of the prior art as described above, and the annular space, ie the annular nozzle, can be changed in size or outwards by extending or moving the inner sleeve of the nozzle so as to be able to adapt to different displacement conditions Liquid demand. When preparing the fracturing fluid, the water is pumped through the annular nozzle from the side and a negative pressure is formed at the outlet of the nozzle due to the jet flow. The powder is sucked in from the inner hole of the nozzle under the action of negative pressure and mixed with water in the throat section of the jetting device Back to the fracturing tank. Since the nozzle of the jet device is in the shape of a ring, the contact area between water and the powder is large, the mixing is more and more uniform, and the performance of the fracturing fluid is better. The on-site operation is quick and easy, effectively shortening the dosing time and speeding up the cattle Gas field fracturing progress.