Double-cock ball throwing device and ball throwing method

Abstract

The invention relates to a double-cock ball throwing device and a ball throwing method. The device is characterized by comprising two T-shaped high-pressure tee joints arranged in the front and the back of a high-pressure main pipeline, wherein the raised ends of the two T-shaped high-pressure tee joints are respectively connected with cocks; the two cocks are respectively connected with two ends of the same high-pressure pipeline through high-pressure elbows, so that a loop is formed in the high-pressure pipeline; and the cocks are provided with cock rocking handles. Through a set of ball throwing system consisting of the two T-shaped high-pressure tee joints, the two cocks and a plurality of high-pressure pipelines, nylon balls are thrown by manually operating the cocks; a process of throwing balls without stopping a pump in the midway is realized by filling a certain number of nylon balls or steel balls into the high-pressure pipeline between the two cocks in advance; a space of 5 to 8 millimeters is respectively formed in the two cocks in construction, so that the pressure of the high-pressure pipelines of two sections and the middle of the cocks is balanced all the time, and the nylon balls can smoothly enter a shaft; and by arranging multistage double cocks on the main pipeline, the number of the thrown balls can be controlled, and meanwhile, the sequence of throwing different balls can be randomly controlled.

Description

technical field [0001] The invention relates to a double cock pitching device and a pitching method. Background technique [0002] In coalbed methane wells, a certain horizon in some wells is divided into upper and lower sections or three sections. Depending on the layer interpretation of different coalbed methane wells, sometimes it is necessary to perform staged fracturing on the upper and lower two to three layers of the same layer to achieve the purpose of improving the reservoir and increasing production and efficiency. The construction method of single-layer staged fracturing in conventional gas wells is to use a liquid nitrogen pump truck to inject liquid nitrogen while injecting liquid nitrogen in the state of non-stop pumping, but this method is limited to single-layer two-stage fracturing. In view of the special geological structure and construction technology of Daning-Jixian CBM wells in Shanxi, liquid nitrogen injection is not required and nylon balls need to b...

AI Technical Summary

Problems solved by technology

This method cannot continuously cast nylon balls in single layer and multiple stages (because using liquid nitrogen to throw balls is to put a certain number of nylon balls into the ball throwing device in advance (for example, according to the construction design requirements, 50 nylon balls need to be thrown after the first stage, and the second 50 nylon balls after the end of the stage), that is to say, only 50 nylon balls can be installed in the ball throwing device at a time by using this method, and only two stages of continuous fracturing can be realized, and the third stage of continuous fracturing cannot be realized

Three or more sections are called multi-sections), and the number of nylon balls thrown into each section cannot be controlled arbitrarily (because the previous ball-throwing device cannot control the number of balls thrown, only a certain number of balls can be put into it in advance for pitching), plus Upper CBM wells do not require liquid nitrogen injection, which makes this method unfeasible (coalbed gas fracturing requires no liquid nitrogen injection due to its special geological structure and low-cost development

The problem with this method is that each layer needs to stop the pump to load the balls, which wastes a lot of time, and the ball throwing device is relatively heavy, and the installation process is difficult and difficult to operate.

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