How does potassium formate drilling fluid solve new drilling problems in old oil areas

At present, after the normalization of epidemic prevention and control, various industries in various regions are taking various measures in an orderly manner to resume work and resume production and restore order of life. The drilling market is also slowly “recovering”, but due to many factors such as water injection wells around some old oil areas, the formation pressure is turbulent, and the construction wells have successively produced water and the wall is easy to collapse. In response to these practical problems, the drilling team urgently needs technical treatment and high-quality drilling fluid. Potassium formate is a new type of additive for drilling and completion fluids. It has been successfully used in high-density drilling and completion fluid systems. It is also easy to solve the new drilling problems in old oil areas.

During drilling, due to improper selection of drilling fluid type and performance, poor wellbore quality, etc., it will cause many difficulties such as downhole resistance, jamming, severe jumps, lost circulation, and blowout during drilling. For example, some Dongpu old areas of Zhongyuan Oilfield have low permeability, high temperature, many fault blocks, complicated underground conditions, and more difficult fracturing reconstruction.

At present, the organic salts for drilling fluids are mainly formate. The potassium formate drilling fluid system has been widely used abroad and has achieved very good results. The characteristics of potassium formate drilling fluid are summarized below, for reference:

(1) No sediment will form when it comes into contact with formation water, and the damage to the reservoir is low.

(2) The biological toxicity is extremely low, harmless and non-toxic to human body, has little effect on aquatic community, and has little biological enrichment.

(3) It is biodegradable, does not pollute the environment, and is recyclable and reusable.

(4) It can provide proper density for drilling and completion fluids, no solid weighting agent is needed, and it is easy to realize non-solid phase drilling or low solid phase drilling.

(5) The pH value of the potassium formate drilling fluid is easy to adjust, and it is less corrosive to metals and rubber.

(6) The circulating pressure drop is small, easy to configure, and simple to maintain.

(7) Low viscosity, good fluidity, and small friction pressure loss, suitable for drilling small boreholes and formations that are easily lost.

(8) Strong inhibition, stable shaft wall and regular bore diameter.

The chlorine-free potassium neoformate drilling fluid system formed by adopting CH3COOK and K3PO4 instead of KCl as inhibitors in China has been applied to the eastern region successively with obvious results. The drilling fluid system is compounded and successfully applied in the 4x1 well in Zhuanghai, achieving high-quality properties such as low toxicity, high efficiency, anti-collapse, strong inhibition, and protection of gas reservoirs.

Potassium formate, a new type drilling fluid with powerful performance, is one of the tools of the drilling team. It exerts all its properties during the drilling process and has been well received by users at home and abroad. At present, the domestic market for potassium formate drilling fluid is relatively stable, and it can be recycled, which is also a wealth accumulated for environmental protection.