China University of Petroleum

Cnpc Engineering Technology R&d Company Limited

Cnpc Chuanqing Drilling Engineering Company Limited

Xiaoxiao Ni

Guancheng Jiang

Lili Yang

Yinbo He

Chunyao Peng

Xi Wang

Jinsheng Sun

Deli Gao

Tengfei Dong

Xuwu Luo

Kai Wang

Yang Bai

Li Li Zhao

Guangchang Ma

Zhengqiang Deng

Xiaolin Pu

Xin Zhang

Yong Wang

Zhong Xian Li

Jingping Liu

Xiaobo Liu

Kaihe Lv

Fan Liu

Xianbin Huang

Le Wang

Xianzhu Wu

Xianmin Zhang

Kun Zhang

Bin Tan

Xiaohu Quan

Xinliang Li

Rongchao Cheng

Xing Liang

Kaixiao Cui

Jianguo Zhang

Xiaohu Luo

Tie Geng

Xiaoyong Wang

Jiansheng Luo

Daqi Fu

Yongbin Guo

Changwei Chen

Qifa Ran

Fabin Xu

The present invention relates to the field of petroleum industry phase oilfield chemistry, and specifically relates to a bionic and dual-phobic drilling fluid. The drilling fluid contains a bionic wall-fixing agent, a bionic lubricant, a super dual-phobic agent, a scrap-carrying agent and a bionic shale inhibitor. The present invention uses the theory of bionics and the theory of a downhole rock surface being double phobic as a basis. By means of using the bionic wall-fixing agent, the bionic lubricant, the super dual-phobic agent, the scrap-carrying agent and the bionic shale inhibitor, which have special properties of imitating animals and plants in nature, and using a series of bionic treatment agents, a set of bionic and dual-phobic drilling fluid systems, which corresponds to an unconventional, complex oil and gas well, is formed.

Bionic and dual-phobic high-performance water-based drilling fluid

The present disclosure relates to the technical field of oil and gas drilling, and particularly relates to a modified silicon dioxide material of a fluorocarbon active agent type super-amphiphobic cutting-carrying agent suitable for a water-based drilling fluid, and a preparation method thereof. The preparation method of the modified silicon dioxide material comprises the following steps: subjecting silicon dioxide and a silane coupling agent represented by Formula (1) to a first contact reaction in a mixed solvent containing alcohol and water; subjecting the product of the first contact reaction, the compound represented by Formula (2) and the compound represented by Formula (3) to a second contact reaction; subjecting the product of the second contact reaction and the compound represented by Formula (4) to a third contact reaction. The modified silicon dioxide material can be used as a cutting-carrying agent in a water-based drilling fluid and produce an excellent cutting-carrying effect. 

Modified silicon dioxide material of fluorocarbon active agent type super-amphiphobic cutting-carrying agent suitable for water-based drilling fluid and preparation method thereof

The invention relates to the field of petroleum drilling fluids, and discloses a super-amphiphobic strongly self-cleaning high-performance water-based drilling fluid comprising polymeric super-amphiphobic agent and a drilling method. The polymeric super-amphiphobic agent comprises structural units A derived from acrylamide, structural units B derived from methyl methacrylate, structural units C derived from butyl acrylate, structural units D derived from a compound represented by the following formula (1), structural units E derived from a silane coupler, and nano-titania; wherein the nano-titania is bonded to the polymeric super-amphiphobic agent via the structural unit E, and the silane coupler is a silane coupler having double bonds; R is a C3-C8 perfluoroalkyl group. A water-based drilling fluid additive prepared from the polymeric super-amphiphobic agent in the present invention has excellent wettability, inhibition, lubrication, reservoir protection, and rheology and fluid loss properties. 

Super-amphiphobic strongly self-cleaning high-performance water-based drilling fluid and drilling method

The present invention relates to the well drilling field in petrochemical industry, in particular to use of dual-cation fluorocarbon surfactant as amphiphobic wettability reversal agent in drilling fluid. The dual-cation fluorocarbon surfactant is a dual-cation fluorocarbon surfactant of which the cation part is represented by the following formula (1). The dual-cation fluorocarbon surfactant of the present invention can serve as wettability reversal agent when it is used for oil-gas drilling to enable rock amphiphobic, and is an amphiphobic wettability reversal agent which can cause rock surface to be non-hydrophilic and non-lipophilic. Using of dual-cation fluorocarbon surfactant, especially when drilling highly hydrous mud shale, can avoid permeation of water and oil into the rock effectively and thereby a capillary phenomenon can be prevented, and an effect of stabilizing the well wall and protecting the reservoir is attained. 

Use of dual-cation fluorocarbon surfactant as amphiphobic wettability reversal agent in drilling fluid

A super-amphiphobic composite material and use of the same as an inhibitor, lubricant, reservoir protectant, and accelerator in water-based drilling fluids. A method for preparing the amphiphobic composite material includes: performing a first mixing of nano-titanium dioxide and nano-silicon dioxide in an alcohol-water mixed solvent under an alkaline condition, to obtain a dispersion of nano-titanium dioxide and nano-silicon dioxide; then introducing a fluorosilicone-containing coupler into the dispersion of nano-titanium dioxide and nano-silicon dioxide and performing a second mixing. The amphiphobic composite material may be applied in water-based drilling fluids. It has an effect of strongly inhibiting hydrated swelling and disintegration, low toxicity and high compatibility; can solve problems such as well wall instability, blockage of drilling tools, and reservoir damage, etc.; and has long-term practical value in complicated wells such as extra-deep wells, horizontal wells and extended reach wells, and in mud-bearing shale formations.

Super-amphiphobic composite material and use of the same as inhibitor, lubricant, reservoir protectant, and accelerator in water-based drilling fluids

Growing community of inventors

Beijing, China

Xiaoxiao Ni