Oil and water well sealing and plugging agent and preparation method thereof

Abstract

The invention relates to the technical field of oilfield chemistry, in particular to an oil and water well sealing and plugging agent and a preparation method of the oil and water well sealing and plugging agent. The oil and water well sealing and plugging agent is suitable for sealing and plugging an oil and water well. The oil and water well sealing and plugging agent consists of the following raw materials: XP lost circulation additive, G-class oil-well cement, blast furnace KZ micro powder, borax and water. The oil and water well sealing and plugging agent has the beneficial effects that the oil and water well sealing and plugging agent is simple to prepare, is convenient to construct, is safe and reliable and has high plugging strength; the oil and water well sealing and plugging agent has the characteristics of excellent suspension stability, low initial viscosity, easiness for pumping, high temperature resistance, high curing strength and the like and is mainly applied to non-corresponding production layers caused by poor cementing quality or damage to a sleeve above and below a perforated section of the oil and water well; the requirements on sealing and plugging of the oil and water well can be met; and currently, the oil and water well sealing and plugging agent is accumulatively implemented for over 90 well times, good sealing and plugging effects are obtained and the water injection efficiency is also improved.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry, and relates to an oil-water well sealing agent and a preparation method thereof, which are suitable for oil-water well sealing. Background technique [0002] During the injection and production process of oil and water wells, due to poor cementing quality and casing damage, there is no correspondence between injection and production, which seriously affects the normal production of oil and water wells. The density of the conventional traditional plugging agent with G grade oil well cement as the main agent is 1.88-1.90g / cm 3 , single well construction workload is heavy, the main plugging principle is no pressure difference physical plugging, the dosage is not easy to control, the target layer is poor, and the excessive dosage will easily cause the pollution of the oil layer. Contents of the invention [0003] The invention provides an oil-water well sealing agent and a preparatio...

AI Technical Summary

Problems solved by technology

[0002] During the injection and production process of oil and water wells, due to poor cementing quality and casing damage, there is no correspondence between injection and production, which seriously affects the normal production of oil and water wells

The density of the conventional traditional lost circulation plugging agent with G-grade oil well cement as the main agent is 1.88-1.90g / cm 3 , and the construction workload of a single well is heavy. The main plugging principle is no pressure difference physics. Clogging, difficult to control the dosage, poor targeting of the target layer, and excessive dosage may easily cause pollution of the oil layer