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发明公开
CN106220797A 适用于油基钻井液降粘的双嵌段共聚物及其制备方法和应用以及油基钻井液和应用 有权

适用于油基钻井液降粘的双嵌段共聚物及其制备方法和应用以及油基钻井液和应用
摘要：
本发明涉及石油工业的钻井领域，具体地，涉及一种适用于油基钻井液降粘的双嵌段共聚物及其制备方法和应用以及油基钻井液和应用。所述双嵌段共聚物主要由嵌段A和嵌段B构成，其中，嵌段A由选自式(1)所示的结构单元构成，嵌段B由选自式(2)所示的结构单元构成，所述嵌段A的数均分子量为1500-10000。本发明的双嵌段共聚物能够在油基钻井液作为降粘剂用，特别是应用于高密度的无土相油基钻井液中作为降粘剂，其在高温高压地层中，在保证适当的切力下，能够较大程度地降低油基钻井液的表观粘度和塑性粘度，以便于加快钻进速度、降低钻井难度。
摘要（英）：

The invention relates to the well drilling field of petroleum industry, and concretely relates to a diblock copolymer suitable for reducing viscosity of oil-based drilling fluid as well as a preparation method and an application thereof, and oil-based drilling fluid and an application thereof. The diblock copolymer mainly comprises a block A and a block B, wherein the block A comprises a structural unit which is selected and shown in a formula (1), the block B comprises a structural unit which is selected and shown in the formula (2), and number-average molecular weight of the block A is 1500-10000. The diblock copolymer can be used as a viscosity reducer for oil-based drilling fluid, and especially can be used as a viscosity reducer which is applied to clay free phase oil-based drilling fluid with high density; in a stratum with high temperature and high pressure, a proper shearing force is guaranteed, apparent viscosity and plastic viscosity of the oil-based drilling fluid can be greatly reduced, in order to accelerate drilling speed and reduce well drilling difficulty.

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