PHOSPHONATE-CONTAINING POLYMER AND USE THEREOF AND PHOSPHONATE-CONTAINING POLYMER VISCOSITY REDUCER FOR DRILLING FLUID
申请人:SINOPEC ZHONGYUAN OILFIELD SERVICE CORPORATION DRILLING ENGINEERING RESEARCH INSTITUTE
公开号:US20140080988A1
公开(公告)日:2014-03-20
The present invention provides a phosphonate-containing polymer and use thereof and a phosphonate-containing polymer viscosity reducer for drilling fluid. The phosphonate-containing polymer comprises structural units expressed by formula (1), structural units expressed by formula (2), and structural units expressed by formula (3) and/or structural units expressed by formula (4), wherein, the ratio of the mole number of the structural units expressed by formula (1), mole number of the structural units expressed by formula (2), and total mole number of the structural units expressed by formula (3) and structural units expressed by formula (4) is 10-85:10-75:5-55. The phosphonate-containing polymer still has outstanding viscosity reducing effect after high-temperature aging when it is applied in brine drilling fluids and high-density drilling fluids.