Southwest Petroleum University

Zhenglan Li

Quantang Fang

Mingqiang Wei

Yonggang Duan

Yu Peng

Keyi Ren

Shuxin Li

Zhihong Nie

Le Luo

Xin Wang

Jinzhou Zhao

Yongming Li

Pengjun Shi

Jiandu Ye

Lei Meng

Zijian Wu

Shuyao Sheng

Shihao Wei

The present invention discloses a double-crosslinked thermal phase transition gel temporary plugging agent and an application thereof, and relates to the technical field of oil and gas field development. The gel temporary plugging agent comprises the following components in percentage by weight: 5.8-18.3% of acrylic acid, 2.8-6.5% of 2-acrylamide-2-methylpropanesulfonic acid, 2.8-7.0% of hydroxyethyl acrylate, 0.2-1.0% of a degradable crosslinking agent, 0.4-1.2% of borax or boric acid, 0.2-0.8% of a high-temperature initiator, 2.6-4.5% of palygorskite attapulgite, 1.5-3.1% of a urea-formaldehyde resin, and the balance of water, wherein the gel temporary plugging agent is formed by underground gelation. The gel temporary plugging agent is applied to oil and gas reservoirs with a temperature of 100-150° C., can automatically be subjected to gelation and degradation, and has a low filtration loss before gelation.

Double-crosslinked thermal phase transition gel temporary plugging agent and application thereof

The present invention discloses a device and method for measuring the relative permeability of propped fractures in shale considering probability distribution, comprising a gas cylinder, a water pump, a booster pump, a rock slab holder, a differential pressure sensor, a directional X-ray source, an X-ray detector, an X-ray shielding box, a tee, a liquid meter, a gas meter, an electronic balance, and a vacuum pump; the inlet of rock slab holder is respectively connected with the gas cylinder and the water pump by the pipe, the outlet is connected with the liquid meter and the vacuum pump by the tee, and the differential pressure sensor is connected with both ends of the rock slab holder; the booster pump is connected with the rock slab holder by the pipe; the inlet of the gas meter is connected with the liquid meter, and the outlet is connected to the external atmosphere.

Device and method for measuring the relative permeability of propped fractures in shale considering probability distribution

The invention discloses a digital imaging technology-based method for calculating relative permeability of tight core, comprising the following steps: step S: preparing a small column sample of tight core satisfying resolution requirements; step S: scanning the sample by MicroCT-400 and establish a digital core; step S: performing statistical analysis on parameters reflecting the characteristics of rock pore structure and shape according to the digital core; step S: calculating tortuosity fractal dimension DT and porosity fractal dimension Df by a 3D image fractal box dimension algorithm; step S: performing statistical analysis on maximum pore equivalent diameter &#x3bb;max and minimum pore equivalent diameter &#x3bb;min by a label. The present invention solves the problems of time consumption of experiment, instrument accuracy, incapability of repeated calculation simulations and resource waste by repeated physical experiment.

Digital imaging technology-based method for calculating relative permeability of tight core

The present invention discloses a shale stress sensitivity testing device and method. The testing device comprises a support table. The left and right ends of the upper surface of the support table are respectively provided with a left side plate and a right side plate. The top of the left and right side plates are connected with the left and right ends of the top plate. The chucks of the clamps are capable of reciprocating motion in the horizontal direction and circular motion in the front-rear direction. The present invention can change the intensity and direction of the effective stress of the rock sample, and determine the permeability of the rock sample under different effective stresses, thus enabling comprehensive testing of the stress sensitivity of shale in different directions and enhancing the accuracy of shale stress sensitivity testing.

Shale stress sensitivity testing device and method

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Chengdu, China

Zhenglan Li