Asphalt layer leakage plugging slurry

Abstract

The invention discloses asphalt layer leakage plugging slurry which comprises the following components in parts by weight: 100 parts of clear water; 2-8 parts of bentonite; 0.2-0.8 part of sodium carbonate; 0.1-0.6 part of biopolymer XC; 0.1-0.8 part of polyanionic cellulose LV-PAC; 0.1-3 parts of hydroxypropyl guar gum; 0.5-6 parts of a coagulation composite blocking agent; 2-10 parts of a compressible high-elasticity plugging agent; 1-10 parts of a leak-proof plugging filler; 0.1-5 parts of a leakage-proof plugging suspension carrying agent; 1-6 parts of a leakage-proof plugging density regulator; 1-6 parts of a plugging enhancer; 1-6 parts of a high-strength consolidation plugging agent; 2-8 parts of an expansion consolidation type plugging agent; 0.1-6 parts of a leakage prevention andplugging reinforcing agent; 0.1-1 part of dodecyl trimethyl ammonium chloride, 1-5 parts of sorbitan monooleate (SP-80) and 1-3 parts of alkylphenol and ethylene oxide condensates (OP-10). The asphalt layer leakage plugging slurry has the advantages of being resistant to asphalt contamination, high in strength, wide in density adjustable range, high in plugging rate and high in plugging success rate, can be applied to leakage plugging of an asphalt layer, and can also be applied to a high-temperature high-permeability layer, a crack karst cave type stratum, a high-temperature leakage storagesame layer and the like.

Description

technical field [0001] The invention relates to a drilling plugging agent, in particular to an asphalt layer leakage plugging slurry. Background technique [0002] In recent years, the commonly used plugging technologies at home and abroad mainly include the following types: 1. Pressure-bearing plugging technology: The pressure-bearing plugging technology is to fill the pores when the equivalent density of the original formation and the leakage interval is lower than the normal value. Measures such as bridging and plugging can increase the pressure equivalent and bottom hole pressure of low-pressure weak formations, reduce leakage, and meet the needs of well control and cementing. Pressure-bearing plugging technology includes: (1) Casing pressure-bearing plugging technology; (2) High-pressure grouting plugging technology; (3) Temperature-varying pressure-bearing plugging technology; (4) Rigid wedge multi-stage plugging and pressure-bearing Plugging technology; (5) Bridge sl...

AI Technical Summary

Problems solved by technology

These conventional plugging technologies have been well applied to a certain extent, but there are still some problems in the face of complex formations. These plugging additives have played a role in oil drilling operations, but there are the following problems when the bitumen layer is lost Disadvantages or deficiencies: ①Conventional plugging technology is generally used. The plugging slurry configured has high density and low viscosity, while the density of the asphalt layer is low, and displacement reaction is very easy to occur during plugging. The more asphalt is replaced, the more low-density asphalt is produced, and the density is increased in order to stop the leak. In this way, the leakage of the plugging slurry is more serious, and the more asphalt is gushed out, which causes a vicious circle; ②These plugging technologies do not have micro Expansion and coagulation, the plugging slurry cannot form a push-type plug with plugging capacity in the lost channel, and it is especially easy to cross grooves to cause displacement reactions; ③ The plugging slurry has no miscibility with the asphalt layer and cannot be cemented with the asphalt layer (4) When the plugging slurry of these plugging technologies is pushed into the asphalt layer, the plugging slurry does not have the ability to clean the asphalt, and the asphalt in the leakage path will be washed away, and when it is cemented with the lost layer, it will bond with the asphalt layer. There is no mutual solubility, so the binding force is poor, resulting in the high-density plugging slurry not being able to stay in the lost zone, which weakens the cementing ability and pressure bearing capacity. The higher the strength of the plugging slurry and the higher the density, the greater the effect

⑤The plugging slurry is easily contaminated by asphalt, and it is easy to flow away in the lost channel of the asphalt layer, and the lost channel cannot be filled, and the plugging effect is poor; at the same time, the returned asphalt pollutes the environment; The plugging agent and the asphalt layer have poor matching and cementing ability, and repeated leakage is likely to occur; the plugging effect cannot be achieved, and the displaced asphalt is easy to wrap the drill string and cause a drill sticking accident

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