RESERVOIR PROTECTING AGENT COMPOSITION FOR RESERVOIR WITH CRACKS, DRILLING FLUID CONTAINING THE SAME AND USE THEREOF

摘要

The present invention relates to the technical field of petroleum drilling, discloses a reservoir protecting agent composition for reservoir with cracks, a drilling fluid containing the same and use thereof. The reservoir protecting agent composition contains an elastic polymer particle, and at least one of a synthetic fiber and a film-forming agent; the elastic polymer particle contains an intermediate product, base, salt and water with specific amounts; and the intermediate product is made of raw materials comprising acrylamide, a cationic monomer, a cross-linking agent, an initiator, a toughening material and water with specific amounts. The reservoir protecting agent composition of the present invention can effectively prevent the drilling fluid from invading the reservoir with cracks, and rapidly block off cracks in the reservoir with cracks. The reservoir protecting agent composition has a high blocking rate and the blocking layer is easily flowback and has advantages such as easy use, good environmental protection performances, and good protection performances for the reservoir.