High pressure-resistant leak stoppage agent and leak stoppage slurry containing same

Abstract

The invention relates to a high pressure-resistant leak stoppage agent and leak stoppage slurry containing the same. The high pressure-resistant leak stoppage agent consists of the following components in percentage by mass: 25.0 to 27.0 percent of soybean particles, 31.0 to 32.0 percent of walnut shell flour, 7.1 to 7.5 percent of vermiculite, 2.1 to 2.5 percent of peanut hull meal, 22.0 to 22.5 percent of cement and 10.0 to 11.0 percent of flocculation coating agent LHB-105 for drilling fluid. The leak stoppage slurry consists of base slurry and the high pressure-resistant leak stoppage agent, wherein 3 to 9 grams of high pressure-resistant leak stoppage agent is added into every 100 milliliters of base slurry. The leak stoppage agent and the leak stoppage slurry stop leaking by combining chemical leak stoppage with particle bridging leak stoppage, so that the technical problems of aperture leak, crack leak and fracture leak under a well can be solved. The leak stoppage agent and the leak stoppage slurry are suitable for severe well leakage caused by a pore formation, a crack formation, a long-section broken formation and the like and can be applied to leak layer construction of which the leak position is difficultly determined.

Description

technical field [0001] The invention relates to a lost circulation agent used in petroleum exploration and drilling, in particular to a high-pressure anti-high pressure lost circulation agent and a lost circulation slurry containing the anti-high pressure lost circulation agent. Background technique [0002] Lost circulation exists to varying degrees in the process of oil and gas drilling in China, 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. During the field implementation of the conventional bridging plugging method, the plugging success rate is only 40% to 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 ...

AI Technical Summary

Problems solved by technology

In the field implementation of conventional bridging plugging methods, the plugging success rate is only 40% to 60%. The main reasons are as follows: 1. The size of the crack opening in the leakage 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 will hinder the entry of smaller materials and form 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, and another leakage occurs

[0003] Therefore, in drilling engineering, sometimes because the fracture width and pore size of the lost formation cannot be accurately grasped, the formulation of the plugging agent cannot be optimized and determined, which increases the uncertainty of successful construction and reduces the success rate of plugging

Moreover, due to the existence of more plugging materials, not only the viscosity is too high, which is not conducive to pumping, the actual application value of on-site construction is lost, but also the on-site labor intensity is increased.

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