One-bag type plugging agent and preparation method thereof

Abstract

The invention relates to a one-bag type plugging agent. According to the invention, all components are arranged in a sealed packaging bag, can be sealed and stored in the sealed packaging bag at normal temperature and normal pressure and do not react with one another; after the bag is opened, the one-bag type plugging agent can be used after being treated. The one-bag type plugging agent comprises the following components in parts: 5-10 parts of a compressible deformation elastic plugging agent, 5-8 parts of mica sheets, 15-22 parts of mineral fibers, 3-8 parts of cotton seeds, 15-25 parts of plant fibers, 15-25 parts of an inorganic blocking agent and 20-30 parts of a bridging agent. The plugging agent for drilling well leakage prepared by the invention has wide particle size distribution from micron to millimeter, is an innovative plugging process which can immediately deal with leakage as long as the leakage occurs, does not need to pre-judge a stratum condition, is especially suitable for permeable stratums, overbalanced stratums and induced cracks, can effectively play a role in bridging and plugging, guarantees that one leaking stoppage material can plug leaking layers of various sizes and different types, and therefore ensures a one-time success rate.

Description

technical field [0001] The invention belongs to the technical field of lost circulation in well drilling, and in particular relates to a bag-type lost circulation agent and a preparation method thereof. Background technique [0002] Lost circulation is a complex situation often encountered in drilling operations, especially when drilling in fractured formations. Therefore, it is necessary to implement effective drilling leakage prevention and plugging technology, and the indispensable basic substance for implementing this technology is the plugging material. At present, the most widely used and low-cost plugging material is bridging plugging. In the process of conventional bridging plugging method being implemented on site, the plugging success rate is only 40%-60%. The main reasons are as follows: 1. The size of the crack opening in the leaking layer is large, and the particle size of the plugging material is small. In particular, the particle size of the hard particle ma...

AI Technical Summary

Problems solved by technology

In the process of conventional bridging plugging method being implemented on site, the plugging success rate is only 40%-60%. The main reasons are as follows: 1. The size of the crack opening in the leaking layer is large, and the particle size of the plugging material is small. In particular, the particle size of the hard particle material is small, so it is difficult to form bridges in the cracks

2. The size of the fracture opening is small. When bridging and plugging, the large particle material will form a door-sealing phenomenon at the crack opening, which hinders the entry of smaller materials and forms a bridge plug, which is blocked on the surface. Under the action of collision, liquid flow scouring, tripping and pulling, and tripping and suction, the large particle material of the sealed door is separated from the crack opening, and leakage occurs again

Complicated on-site operation and preparation, and the formula is not uniform, large particles are easy to cause "door sealing" phenomenon, and have no strength, no temperature resistance, resulting in the illusion of successful plugging

When drilling, the plugging material that "seals the door" will continue to regurgitate, causing the formation to leak again

Not only wasted engineering time, but also increased overall drilling costs

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