Self-suspension proppant and preparation method thereof and construction method

Abstract

The invention discloses self-suspension proppant, a preparation method thereof and a construction method, and belongs to the technical field of fluid ore mining. The construction method includes the steps of 1) using one of gel, linear gel, slippery water and natural water as prepad, pumping the prepad with a high pressure pump and fracturing a target reservoir to form an initial geological crack; 2) continuously adding the natural water, as sand-carrying fluid, into a mixing sand tanker, performing stirring while adding the self-suspension proppant to from suspension liquid with a volume ratio of the natural water to the proppant being 100:(5 to 60); 3) continuously pumping the suspension liquid, after the prepad, into the initially formed geological crack with the high pressure pump, so as to allow the initially formed geological crack to extend continuously to form a geological crack supported by the proppant. According to the construction method, during fracturing, no expensive fracturing fluid which contains organic molecules is required, widely available natural water is directly used instead, and thus the construction is convenient with lower cost and less pollution.

Description

technical field [0001] The invention relates to the field of fluid mine mining, in particular to a self-suspension proppant, a preparation method thereof, and a hydraulic fracturing construction method in oil and gas fields. Background technique [0002] During the exploitation of fluid mines (gas, oil, hot water, etc.), in order to obtain high yields, fluid conduction force (such as hydraulic power, etc.) is often used for fracturing construction. The process of fracturing is to use high-pressure and large-displacement pumps on the ground, and use the principle of liquid pressure transmission to send a liquid with a certain viscosity (usually called fracturing fluid) to the reservoir with a pressure greater than the absorption capacity of the reservoir. Injection, and gradually increase the pressure in the wellbore, so as to suppress the high pressure at the bottom of the well. When the pressure is greater than the in-situ stress near the well wall and the tensile strength ...

AI Technical Summary

Problems solved by technology

After the fracturing fluid reaches the bottom of the well and enters the reservoir, there will be a certain degree of fluid loss. In order to reduce fluid loss and improve sand-carrying capacity, organic molecules such as polymer thickeners are usually added to the fracturing fluid. However, these organic molecules With the filtration loss of fracturing fluid, it will cause damage to the reservoir, reduce the oil conductivity of the reservoir, and pollute the reservoir

[0005] Moreover, the current fracturing fluid generally needs to be mixed with a polymer thickener in advance and stirred evenly, and then placed for a long time (1-2 hours at a short time, about 24 hours at a long time), and then add proppant before fracturing construction , the time is long, and the construction is inconvenient; in addition, the cost of fracturing fluid is high, so people in the field have been committed to finding a fracturing construction method that is convenient, low in cost, and less polluting

Images