A liquid colloid filling low-temperature well-cementing cement mortar system

Abstract

A liquid colloid filling low-temperature well-cementing cement mortar system is provided. The system is characterized in that the system includes 100 parts by mass of Portland cement, 80-120 parts by mass of ultrafine Portland cement, 10-30 parts by mass of hollow glass microbeads, 10-20 parts by mass of micro-silicon, 8-12 parts by mass of liquid colloid, 2-6 parts of an early strength agent, 1-2 parts by mass of drag reducer, 4-8 parts by mass of a water loss reducing agent, 1-2 parts by mass of a defoamer and 120-150 parts of water. According to the system, the density of the system is adjustable in a range of 1.35-1.65 g/cm<3>, the low-temperature early strength is high, thickening performance and fluidity are good, the water loss amount is low, and the system has excellent anti-fluid-channeling performance, can be used for well cementing for deepwater surface layer sections, can save working time and costs and can provide safe and efficient technical supports for deepwater oil and gas exploitation.

Description

technical field [0001] The invention relates to a low-temperature cementing slurry system filled with liquid colloid, and belongs to the technical field of oil and gas well cementing. It is especially suitable for deep water shallow layer cementing operations with low temperature, low fracture pressure, and prone to water-gas channeling, and it can also be used for surface layer cementing in cold areas of onshore oilfields. Background technique [0002] With the development of global onshore oil and gas resources becoming more and more mature, oil and gas production continues to decline, and the direction of exploration and development of oil and gas resources is constantly shifting to offshore oil and gas. The global marine oil and gas reserves are about 100 billion tons, and the proven reserves are more than 38 billion tons. The natural gas reserves are about 140 trillion cubic meters, and the proven reserves are about 40 trillion cubic meters. At present, 80% of the prov...

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Problems solved by technology

Among them, the early strength of the rapid-hardening cement system develops rapidly, but there are problems of short thickening time and difficult adjustment, and the cost of rapid-hardening cement is high; the existence of foam in the foam cement slurry system makes the stability of the cement slurry worse. , the early strength and final strength of cement stone are low, and the foam cement slurry system requires additional equipment and technical personnel, and the construction cost is high; the particle size optimized cement system with ultrafine cement or ultrafine particles can be used at low temperature and low density. It is difficult to obtain better anti-channeling ability and early strength; the ultrafine slag cement system has poor rheological properties and cannot guarantee the later strength

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