Southwest Petroleum University

Hu Jia

Yongming Li

Yu Peng

Ang Luo

Xiyu Chen

Xiaolin Pu

Tianshou Ma

Pengjun Shi

Cheng Chang

Gui Wang

Shengjiang Xu

Qing Yin

Shangkun Dai

The present invention disclosed a cross-linked plugging agent stimulated by high density brine which comprises: main agent: 21 wt %-53 wt %, gelling agent: 0.5 wt %-9 wt % and pure water; wherein the saline solution is selected from the group consisting of a Dipotassium phosphate (KHPO), a Tripotassium phosphate (KPO) and a Potassium pyrophosphate (KPO); the gelling agent is selected from the group consisting of a Xanthan gum and a kappa carrageenan. The gelling time is controlled within 0.5-12 h under an experiment temperature of 90° C.-160° C. The final gelling strength is controlled within D-H. The density is controlled within 1.2-1.55 g/cm.

Cross-linked plugging agent stimulated by high density brine and preparing method thereof

The present invention discloses a method for comprehensive evaluation of shale fracability under the geology-engineering 'double-track' system, comprising the following steps: S1: Divide the target horizontal fracturing interval into multiple sampling sections; S2: Establish the reservoir property evaluation factor of each sampling section, and calculate the geological evaluation index of the target horizontal fracturing interval according to the reservoir property evaluation factor of each sampling section; S3: Establish the brittleness factor, natural fracture factor and natural fracture opening factor of each sampling section, and then establish the engineering evaluation index of each sampling section according to these factors; S4: Calculate the engineering evaluation index of the target horizontal fracturing interval according to the engineering evaluation factor of each sampling section; S5: Evaluate the fracability of the target horizontal fracturing interval according to the geological evaluation index and the engineering evaluation index.

Method for comprehensive evaluation of shale fracability under the geology-engineering 'double-track' system

A method of designing a particle size distribution of particulate bridging lost circulation material for a fractured leakage includes the following steps: classifying the lost circulation materials according to a particle size; calculating an expected range of a characteristic particle size of the lost circulation materials according to a fracture width and particle size selection criteria; setting a relative percentage content of the each level of the lost circulation materials; using a particle size distribution function to fit a particle size distribution curve; calculating the characteristic particle size of the lost circulation materials according to the particle size distribution curve; determining whether the calculated characteristic particle size conforms to the expected range of the characteristic particle size; and generating the particle size distribution of the lost circulation materials conforming to the particle size selection criteria.

Method of particle size distribution of particulate bridging lost circulation materials for fractured leakage

The present invention discloses a method for evaluating and preventing creep damage to conductivity of hydraulic fracture in gas reservoirs, comprising: (1) selecting a rock sample of target reservoir for creep experiment, and plotting &#x3b5;-t curve of the rock sample during creep; (2) fitting the fractional Kelvin model with the &#x3b5;-t curve of the rock sample during creep; (3) calculating the conductivity and permeability of hydraulic fracture considering creep damage; (4) numerically solving the productivity model, calculating the cumulative gas production of the gas well produced up to time t, and calculating the creep damage rate for cumulative production of the gas well; (5) repeating Steps (3) to (4), calculating the creep damage rate for cumulative production for the cases of hydraulic fracture sanding concentration N of 5 kg/m, 7.5 kg/m, 10 kg/m, 12.5 kg/mand 15 kg/mrespectively, plotting the creep damage chart of cumulative production.

Method for evaluating and preventing creep damage to conductivity of hydraulic fracture in gas reservoirs

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Chengdu, China

Hu Jia