China University of Petroleum

Research Institute of Exploration and Development, Shengli Oilfield Branch, Sinopec

Guangzhong Lv

Yong Wang

Zhaomin Li

Chao Zhang

Zhen Wang

Bo Chen

Songyan Li

Shouya Wu

Linghui Xi

Meijia Wang

Chuanbao Zhang

Tongyu Yao

Zhongwei Wu

Chuanzhi Cui

Yongpeng Ren

Gang Cao

Xiaoduo Cui

Provided is a carbon dioxide fluidity control device comprising, a sample preparation tank, a high-pressure stirring unit, a reciprocating plunger pump and a booster pump, wherein the stirring unit comprises one or more high-pressure stirring tanks, each provided with an atomizing spray probe and a piston, wherein a discharge port of the sample preparation tank is connected to the atomizing spray probe via a plunger pump, which is connected to the piston to push the piston to reciprocate; the booster pump is connected to the high-pressure stirring tanks to provide supercritical carbon dioxide to the high-pressure stirring tank; and a discharge port of the high-pressure stirring tanks is connected to an oilfield well group. Provided is a carbon dioxide fluidity control method using the device, comprising mixing surfactants and nanoparticles with heated carbon dioxide, and injecting a microemulsion of supercritical carbon dioxide and nano-silicon dioxide into an oilfield well group.

Carbon dioxide fluidity control device and method

The invention discloses a method for determining vertical well stratified fracturing crack length based on interlayer equilibrium development. According to the method, interlayer equilibrium development can be achieved by determining the crack length of fracturing of each layer in the condition that an oil well meets the productivity requirements. The method comprises the following steps: 1) a threshold pressure gradient of each layer is determined; 2) a relationship chart of the crack half-length xand the equivalent well diameter ris established; 3) daily oil production rate per unit thickness Qmeeting the production requirements is calculated; 4) the equivalent well diameter rof each layer is calculated according to the daily oil production rate Q; and 5) the crack half-length xof fracturing of each layer is calculated according to the equivalent well diameter rof each layer.

Method for determining vertical well stratified fracturing crack lengths based on interlayer equilibrium displacement

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Dongying, China

Guangzhong Lv