Composite material plugging agent for water plugging and leaking plugging of horizontal well and preparation method of composite material plugging agent

Abstract

The invention provides a composite plugging agent for water plugging and leakage plugging of a horizontal well. Thecomposite plugging agent comprises the following components in parts by weight: an inorganic cementing material, an inorganic auxiliary cementing material, an organic polymer reinforcing material, and a functional aid. The preparation method comprises the following steps: respectively processing an inorganic cementing material and an inorganic auxiliary cementing material into powder through a mechanical pulverizer or an airflow type ultrafine pulverizer; uniformly mixing an organic polymer reinforcing material and a part of inorganic material, heating by a double-screw extruder to prepare solid particles, and crushing the solid particles into powder; and uniformly stirring and mixing the prepared powder and a functional additive in a multifunctional stirrer to obtain composite material plugging agent powder for water plugging and leaking stoppage of the horizontal well. The use method comprises the following steps: preparing slurry-shaped plastic slurry in a dispersion machine, squeezing and injecting the prepared plastic slurry plugging agent to a layer needing to be plugged by using a cement pump truck and a squeezing and plugging pipe tool, lifting the squeezing and sealing tubular column, and waiting for solidification under pressure. According to the invention, the initial viscosity before thickening is low, the fluidity is good, the construction method is simple and feasible, and the storage is safe and stable.

Description

technical field [0001] The invention belongs to the field of oilfield chemistry, and in particular relates to a composite material plugging agent for water plugging and leakage plugging of horizontal wells and a preparation method thereof. Background technique [0002] Horizontal well water control and leak plugging technologies are still in the exploratory stage in oil and gas reservoir stimulation at home and abroad, and there is no effective method for reference at this stage. How to choose a high-performance plugging agent is particularly important in the research of water plugging and leak plugging technology for horizontal wells. For a long time, the development of oil and gas field plugging technology has been severely restricted by the two major defects of inorganic plugging agents, which cannot be injected and retained. Therefore, it is very urgent to develop a plugging agent for horizontal well water plugging and leakage plugging with micro-expansion and no fluid ...

AI Technical Summary

Problems solved by technology

The plugging agent has stable performance, good retention, strong adhesion, high elastic modulus, and high compressive strength. However, since the plugging agent is mainly composed of a large number of polymer materials, it cannot meet wide-scale applications due to its high price.

[0005] Chinese patent literature (CN 108504340 A) discloses a channeling and plugging agent for oilfields, which is measured by weight percentage and consists of 50% to 60% of inorganic salt microcrystalline material, 5% to 10% of honeycomb structure forming agent, microsphere Active filler 10%~20%, chelating performance modifier 2%~8%, colloidal structure toughening agent 3%~10%, colloidal structure strengthening agent 3%~10%, gel accelerator curing agent 2%~ 7%, mix and grind raw materials according to the above ratio to make powder with a particle size of 8-2500 mesh, and mix with water to make a slurry when used. Density: 1.45-1.8g / cm3, apparent viscosity: 20-85mpa.s. Because the plugging agent slurry prepared by this patented technology has a high water loss rate after hardening, it will cause volume shrinkage and cannot be applied to water plugging or channeling in the horizontal section of horizontal wells

Since the patented technology is mainly based on inorganic materials, the interface adhesion and tensile shear strength are low, and the plugging is easy to fail under the back pressure