Yangtze University

Shanwen Yu

Weichu Yu

Ying Zhang

Xiangsong Xiao

Wenming Shu

Aibin Wu

Dongkui Zhou

Qingwen Zeng

A main chain of a temperature-resistant and anti-collapse multi-branched polymer fluid loss reducer is composed of the following repeating unit (I): In the repeating unit (I): x:y:z=(20&#x2dc;80):(20&#x2dc;80):(2&#x2dc;30); the Rand Rgroups are alkylamines having a multi-branched structure. The beneficial effect of the multi-branched polymer fluid loss reducer is: introducing cheap acrylamide branch monomer into the polymer monomer system of acrylamide and 2-acrylamido-2-methylpropanesulfonic acid, the preparation process is simple, the reaction conditions are mild, and the production cost is significantly reduced.

Temperature-resistant and anti-collapse multi-branched polymer fluid loss reducer and preparation method thereof

Disclosed is slick water volumetric fracturing method with large liquid volume, high flow rate, large preflush and low sand ratio, including the following steps: (a) evaluating the reservoir parameters; (b) determining the perforation position and a perforation parameters of a fracturing interval; (c) determining the fracturing parameters; (d) performing a perforation operation on the fracturing interval; (e) injecting acidizing fluids into the perforation; (f) alternately injecting preflush and sand-laden fluids into the fracturing interval several times; (g) injecting displacement fluids into the fracturing interval; wherein the flow rate is not less than 12 m/min. The beneficial effect of the technical scheme proposed in the present invention is: by using a low viscosity slick water fracturing fluid with high flow rate, the pressure of the fracturing fluid is increased, thereby increasing the stimulated reservoir volume and increasing the fracturing yield.

Slick water volumetric fracturing method with large liquid volume, high flow rate, large preflush and low sand ratio

Disclosed is an integrated construction method of fracturing and tertiary oil recovery for low-permeability reservoir, including the following steps: dividing the target layer into several fracturing intervals; determining the amount of fracturing fluid required for the target fracturing interval; determining the flow rate of the target fracturing interval; determining the pumping construction procedure for the target fracturing interval; perforating the target fracturing interval; injecting oil displacement fracturing fluid into the target fracturing interval for fracturing construction; wherein the oil displacement fracturing fluid is a fracturing fluid to which an oil displacement agent is added. The beneficial effect of the technical scheme proposed in this disclosure is: by adding an oil displacing agent to the fracturing fluid, the fracturing and tertiary oil recovery are integrated, thereby improving the effect of fracturing and tertiary oil recovery, while also avoiding the water lock effect of the reservoir. Compared with the existing 'first fracturing then tertiary oil recovery' scheme, it has obvious advantages.

Integrated construction method of fracturing and tertiary oil recovery for low-permeability reservoir

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Jingzhou, China

Shanwen Yu