Acid soluble leak stopping agent

Abstract

The leak stopping agent consists of acid soluble material15-45 wt%, bentone powder 5-25 wt%, lime powder 5-30 wt%, calcium carbonate powder 5-25 wt%, cement 0-40 wt% and fibrous material 0-20 wt%. When it is used in stopping leak, the above said materials are mixed homogeneously before further mixing with 2-7 times of water or 3-10 times of well drilling liquid. It is superior in stopping leak during well drilling owing to the high adhesion force and shearing resistance between the stopping matter and the leak layer. It is especially suitable for treatment of indefinite and complicated leak layer.

Description

Technical field: [0001] The invention belongs to the technical field of drilling lost circulation agent. Background technique: [0002] In oil and gas exploration and drilling, concurrent leakage is one of the ubiquitous downhole complex situations. Lost circulation occurs, which affects the drilling speed and consumes materials and funds. How to effectively plug leakage is a problem that must be solved in the drilling and production of oil and gas industry. At present, the leak-stopping agents in the prior art at home and abroad can be roughly divided into bridge plugging agents, chemical leak-stopping agents, and composite leak-stopping agents. The bridge plugging agent is mainly made of hard materials and is used to plug pores and cracks. Its advantages are convenient preparation and safe construction. The disadvantage is that it can only seal shallow cracks, and the plugging is not tight enough. , when the pressure fluctuation is caused by re-spinning after plugging, ...

AI Technical Summary

Problems solved by technology

The bridge plugging agent is mainly made of hard materials and is used to plug pores and cracks. Its advantages are convenient preparation and safe construction. The disadvantage is that it can only seal shallow cracks, and the plugging is not tight enough. , when the pressure fluctuation is caused by re-spinning after plugging, the blockage at the blocked place will be disengaged, and lost circulation will occur again

The prior art lost circulation agent can block general lost circulation, but the effect is not ideal for lost circulation in long-term fragile formations and induced lost circulation in pressure-sensitive formations