Dual-effect well cementing pad fluid using suspending agent as surfactant

Abstract

The invention relates to a dual-effect well-cementing pad fluid using a suspending agent as a surfactant, and mainly solves problems that present well-cementing pad fluid is added with high-molecular polymer grade inorganic suspending agent which can influence compatibility and cement sheath cementation and thus influence sealing effect of well cementing and exploitation operation in a later stage. The dual-effect well-cementing pad fluid comprises the following components by weight parts: 12-20 parts of a flushing suspending agent, 0.2-1 part of an antifoaming agent, 0-420 parts of a weighting agent and 100 parts of water. The dual-effect well-cementing pad fluid using a suspending agent as a surfactant can eliminate adverse influences of inorganic soil and the high-molecular polymer in the well-cementing pad fluid on the compatibility and the cement sheath cementation, improve flushing and displacing effects on a drilling fluid, and guarantee quality of well cementing and the exploitation operation in the later stage.

Description

Technical field: [0001] The invention relates to a cementing prefluid in the technical field of oilfield drilling engineering, in particular to a double-effect cementing prefluid in which a surfactant is a suspending agent. Background technique: [0002] The cementing prefluid can be divided into flushing fluid and spacer fluid according to their functions, and the two are usually used in combination to form a combined cementing prefluid, and there are also two combined to form a double-acting cementing prefluid. Whether it is spacer fluid or an integrated double-acting preflush, it is necessary to use inorganic soil or high molecular polymer as a suspending agent to suspend the weighted material. The addition of polymers and inorganic suspending agents, on the one hand, adversely affects the compatibility of the pad fluid, drilling fluid and cement slurry; in addition, when the pad fluid formulated with polymers and inorganic suspending When it is at the interface, it will...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to overcome the problems existing in the background technology that the addition of high-molecular polymer grade inorganic suspending agent to the existing cementing prefluid affects the compatibility, the cement sheath is cemented, thereby affecting the sealing effect of the cementing well and the later mining operations. And provide double-effect cementing prefluid with surfactant as suspending agent

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