Broad spectrum type high-efficient blocking agent for drilling fluid

Abstract

The invention discloses a broad spectrum type high-efficient blocking agent for drilling fluid, which comprises the following components in percentage by weight and granularity: 20-50 percent of polymeric water absorbent swollen resin which is coated by paraffin, wherein the granularity is 270-400 meshes; 10-20 percent of chemical fiber, wherein the granularity is 140-170 meshes; 1-5 percent of velveteen powder, wherein the granularity is 80-120 meshes; 5-15 percent of peanut shell powder, wherein the granularity is 60-100 meshes; 5-15 percent of phoebe zhennan powder, wherein the granularity is 80-120 meshes; 10-20 percent of asphalt powder, wherein the granularity is 60-100 meshes;1-10 percent of walnut shell powder, wherein the granularity is 100-140 meshes; and 1-10 percent of super-fine calcium carbonate, wherein the granularity is 900-1100 meshes; and the polymeric water absorbent swollen resin which is coated by the paraffin is AMPS-AM-AA terpolymer polymeric water absorbent swollen resin. The broad spectrum type high-efficient blocking agent for the drilling fluid has the effect of broad spectrum blocking, has the good blocking effect on cracks with the size from millimeter dimension to micron dimension, dose not damage an oil and gas reservoir, can protect a hydrocarbon reservoir, does not have the bad influence on property of the drilling fluid, and is an excellent plugging agent while drilling.

Description

technical field

[0001] The invention relates to a petroleum drilling aid, in particular to a broad-spectrum high-efficiency plugging agent for drilling fluid. Background technique

[0002] At present, in oil drilling operations, in order to prevent the water in the drilling fluid from entering the formation and causing drilling accidents, the construction party usually adds a plugging agent to solve the above problems. At present, the most widely used plugging agents are single pressure sealing agent and bridging plugging agent, but these two kinds of plugging agents do not have a broad-spectrum plugging effect, and can only target fractures with a specific width. The protective effect of the layer is not good, which has a great impact on the performance of the drilling fluid and affects the drilling speed. CN102127400A discloses a low-permeability reservoir plugging agent for drilling fluid protection, comprising the following components: 10-40 parts of acid-soluble fiber,...

Images