Displacement liquid for deep water drilling liquid

Abstract

The invention provides displacement liquid for deep water drilling liquid, and belongs to the field of petroleum natural gas deepwater drilling engineering. By using the weight parts of a water phaseas the reference, the displacement liquid is prepared from the following ingredients in parts by weight: 100 parts of water phases, 1 to 3 parts of pH regulating agents, 0.5 to 10 parts of gelatinizing agents, 0.5 to 5 parts of cross-linking agents and 0 to 25 parts of cleaning agents. The initial viscosity is reached after the pH regulating agents and the gelatinizing agent are compounded; the integrally flowing displacement liquid for deep water drilling liquid is obtained by adding the cross-linking agents; the mutual motion due to the interference of other liquid is avoided in the pipelineflowing process; the goal of whole separation is achieved; the cleaning agents are combined to be used; when water-based drilling liquid is replaced with synthetic-based or oil-based drilling liquid,the pipe wall can be cleaned and cleared; the mutual replacement of water-based drilling liquid, oil-based drilling liquid and synthetic-based drilling liquid is realized; the characteristics of little mixed slurry and high replacement efficiency are realized.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling engineering oil field chemistry, in particular to a replacement fluid for deep water drilling fluid. Background technique [0002] Deep water and ultra-deep water drilling is an important field of oil exploration and development in the future. A series of deep water and ultra-deep water exploration operations have been carried out in the South China Sea. In the field of drilling engineering, it is often necessary to use synthetic-based drilling fluids to solve the natural gas hydrates in deep water. Due to the problem of pipeline blockage, due to the limitations of well structure design, formation, environmental protection, cost and other issues, drilling engineering will use synthetic-based drilling fluids and water-based drilling fluids in different well structure designs to solve different drilling purposes . [0003] In deep water, the water depth often reaches more than 1,000 mete...

AI Technical Summary

Problems solved by technology

[0003] In deep water, the water depth often reaches more than 1,000 meters, or even 3,000 meters. In addition to the ground and underground pipe strings, the drilling fluid delivery pipeline is very long. During the replacement process of synthetic-based drilling fluid and water-based drilling fluid in different well sections, due to the need Control the rheology of the drilling fluid to make it easy to pump, but during such a long-distance transportation process, the synthetic-based drilling fluid and the water-based drilling fluid are easily mixed, causing mutual pollution, and the contaminated drilling fluid cannot be processed. Due to the limitation of environmental protection, the operation cannot be discharged into the sea, and it must be returned to land for processing, which increases the cost of storage, transportation, and processing. The amount of drilling fluid that is often mixed with each other will reach more than 100 cubic meters, causing great waste. However, the existing The effect of using high-concentration polymer thick plug as the spacer fluid for replacing drilling fluid is poor, and it is difficult to achieve the purpose of reducing mud mixing

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