Cnpc USA Corporation

China National Petroleum Corporation

Beijing Huamei Inc.

Cnpc Chuanqing Drilling Engineering Company Limited

Cnps USA Corporation

Meng Lu

Weibin Zha

Janine Shipman

Wei Wan

Ping Huang

Fuchen Craig Liu

Burhan Hoxha

Nancy Zhou

Guang Chang Ma

Jianshen Li

Feng Feng Xiao

Fuchen Liu

Danhua Zhang

A low-end rheology modifier for adjusting rheological characteristics of water-based drilling fluid systems, particularly for high salt, high density drilling fluids in high temperature and high-pressure applications. The low end rheology modifier comprises a copolymer and laponite clay, the copolymer comprising tert-Butylacrylamidosulfonic acid (TBAS) and n-vinylpyrrolidone (NVP) crosslinked with N,N'-Methylenebis(acrylamide).

High temperature high salt low end rheology modifiers

This disclosure describes the composition and methods of use for a novel delayed polymer gelation system for high temperature and high salinity applications. This polymer gelation system includes a polymer of acrylamide, AMPS and 500-5000 ppm polyethylene glycol diacrylate in inverse emulsion form, and a polyethyleneimine (PEI) with a MW of 2,000-30,000 daltons as the crosslinking agent.

Delayed gelation polymer system for high temperature and high salinity applications

The disclosure includes a new test method of evaluating lost circulation prevention with expandable geopolymers. The expandable geopolymer is tested using a permeability plugging tester, slot disk, drilling fluid, and a piston to determine how much fluid is released from the test cell.

Lost circulation test method for expandable geopolymers

This disclosure describes the composition and methods of use for a novel delayed polymer gelation system. This polymer gelation system includes a polymer of acrylamide, AMPS and 100-2,000 ppm polyethylene glycol diacrylate in inverse emulsion form, and a polyethyleneimine (PEI) with Mw of 5,000-100,000 Dalton as the crosslinking agent.

Delayed gelation polymer system

A combination of three polymers including a crosslinked acrylamide-TBAS copolymers in inverse emulsion form, N-vinyl pyrrolidone-acrylamide-TBAS terpolymer, and crosslinked N-vinyl pyrrolidone-acrylamide-TBAS acts as high temperature, high pressure fluid loss control additives for water-based drilling fluids systems. The combination is particularly useful for high salt, high density drilling fluids, and high temperature applications.

Polymer system for fluid loss control

Crosslinked high molecular weight acrylamide and 2-acrylamido-2-methylpropane sulfonic acid copolymers in inverse emulsion form act as inhibitive and encapsulating agents for water-based drilling fluids system. The crosslinked copolymer are particularly useful for high salt, high density drilling fluids in high temperature and high pressure applications.

Crosslinked high molecular weight polymers for use in water-based drilling fluids

Growing community of inventors

Sugar Land, TX, United States of America

Meng Lu