Carbon dioxide anhydrous fracturing system and method

Abstract

The invention discloses a carbon dioxide anhydrous fracturing system and method, and belongs to the field of oil and gas exploitation. The system comprises a plurality of carbon dioxide transport vehicles, a gas-liquid separation tank, a booster pump, a sand mixing tank, a liquid adding pump, a liquid conveying pipe, a stirring piece and a plurality of fracturing pump trucks; the multiple carbon dioxide transport vehicles are connected with the gas-liquid separation tank, the gas-liquid separation tank is connected with the inlet end of the booster pump, an outlet of the booster pump is connected with the top of the sand mixing tank and the liquid inlet ends of the bottoms of the multiple fracturing pump trucks, and the liquid outlet ends of the tops of the multiple fracturing pump trucks are used for being connected with a wellhead of an oil well; and the bottom of the sand mixing tank is connected with a first liquid inlet of the liquid conveying pipe, the stirring piece is located in the liquid conveying pipe, the liquid adding pump is connected with a second liquid inlet of the liquid conveying pipe, and a liquid outlet of the liquid conveying pipe is connected with the multiple fracturing pump trucks. The system can be applied to sensitive unconventional tight oil and gas reservoirs, and the success rate of fracturing and the supporting effect of a proppant are improved.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of oil and gas exploitation, and in particular to a carbon dioxide anhydrous fracturing system and method. Background technique [0002] With the continuous increase of oil and gas demand and the continuous decline of conventional oil and gas production, unconventional oil and gas with great resource potential has gradually become the mainstream of development. During the development of tight oil and gas reservoirs, reservoirs have poor physical properties, strong sensitivity, and water lock damage. Seriously, the water-based fracturing fluid stays for a long time, which increases the damage rate of the reservoir matrix. Therefore, the method of carbon dioxide anhydrous fracturing is often used for fracturing construction of reservoirs. [0003] In the related technology, by adding carbon dioxide and proppant into the oil well, the high pressure carried by the carbon dioxide inject...

AI Technical Summary

Problems solved by technology

[0006] The embodiment of the present invention provides a carbon dioxide anhydrous fracturing system and method, which can solve the problem of sensitive unconventional tight oil and gas reservoirs. Poor technical issues

Images