Potassium salt polymer drilling fluid

Abstract

The invention relates to potassium salt polymer drilling fluid and belongs to the field of oilfield chemistry. The potassium salt polymer drilling fluid is characterized by containing the following substances in percentage by weight: 3-10% of clay, 1-8% of weighting material, 1-3% of sulfonated lignin sulfomethyl phenol-formaldehyde resin copolymer, 1-1.5% of potassium polyacrylate, 1-2% of potassium chloride, 1-4% of lubricant and the balance of tap water. According to the potassium salt polymer drilling fluid, proportioned materials are simple and are readily available, and the potassium salt polymer drilling fluid has the advantages of high inhibition capability, calcium resistance, salt resistance and collapse prevention and is applicable to oil wells of various depths.

Description

technical field [0001] The invention belongs to the field of oilfield chemistry, and in particular relates to a potassium salt polymer drilling fluid. Background technique [0002] Drilling fluid is the circulating flushing medium used in the hole during the drilling process, also known as drilling flushing fluid. Drilling fluid plays an important role in the process of oilfield exploitation. During the drilling process, 75% of the mud shale layer is often encountered, and about 90% of the well wall instability problems occur in the mud shale well section. The drilling fluid containing potassium ions The application of mud shale dispersion mud has been well controlled, the content of submicron particles and inferior solid phase in drilling fluid has been greatly reduced, and the ROP has been greatly improved. However, with the continuous application of technology, it has also exposed Some disadvantages, such as poor drilling fluid suppression ability and limited anti-slump ...

AI Technical Summary

Problems solved by technology

Drilling fluid plays an important role in the process of oilfield exploitation. During the drilling process, 75% of the mud shale layer is often encountered, and about 90% of the well wall instability problems occur in the mud shale well section. The drilling fluid containing potassium ions The application of mud shale has been well controlled and the submicron particles and low-quality solid content in the drilling fluid have been greatly reduced, which has greatly improved the ROP. However, with the continuous application of technology, it has also exposed Some disadvantages, such as poor suppression ability of drilling fluid, limited anti-slump effect, etc.