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Alkali-resistant cement paste plugging method

A plugging method and mud technology, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve problems such as failure of plugging, lack of strength, and cement slurry flocculation, etc. The effect of reducing environmental pressure and increasing bond strength

Pending Publication Date: 2021-11-26
HENAN ZHONGYUAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The natural alkali brine invades the conventional cement slurry system, which promotes the flocculation of the cement slurry, and the injected cement slurry has no strength after solidification, resulting in the failure of plugging.

Method used

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Embodiment 1

[0021] (1) After the water gushing layer is found, record the position of the water gushing layer in detail, observe the water gushing volume, estimate the size of the possible dissolved cavity or crack, then close the wellhead, install a pressure gauge, observe the static pressure of the wellhead, and then measure the mud proportion in the well to calculate the water gushing layer According to the pressure, the specific gravity of the weighted mud is adjusted. Generally speaking, the specific gravity of the actual weighted mud is slightly higher than the calculated value, and the added value is about 0.1-0.3g / l, and then the mud volume in the wellbore is calculated. Based on this As the volume of proportioned weighted mud, the general proportioning margin is increased by 20%;

[0022] (2) After the counterweight mud preparation is completed, the mud can be injected into the wellbore. The mud injection can be injected directly from the wellhead, or can be injected to a certain ...

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Abstract

The invention discloses an alkali-resistant cement paste plugging method. The method comprises the following steps of 1, analyzing chemical components of gushing water in a well, according to the components, utilizing alkali halide gushing out from the well, preparing a formula of indoor plugging alkali-resistant cement paste, testing, calculating the amount of the required plugging alkali-resistant cement paste, storing a certain amount of underground alkali halide on site to prepare the alkali-resistant cement paste, observing the static pressure of the gushing water, measuring the specific gravity of cement paste in the well, calculating the pressure of a water burst formation, and calculating the specific gravity of counterweight cement paste according to the well depth and the well diameter. The invention not only provides a method for controlling gushing by water emitting, but also thoroughly solves the problem of limited resource exploitation, changes the limitation of a trona exploitation fracturing water-soluble mining process, ensures the purity of the cement paste, enhances the cementing strength of the cement paste, enhances the rigidity of the cement paste after coagulation, ensures the well completion rate, and the environmental protection pressure is also reduced.

Description

technical field [0001] The invention belongs to the technical field of trona drilling casing cementing, and in particular relates to a plugging method for alkali-resistant cement slurry. Background technique [0002] At present, for the mining of deeply buried soluble salts (trona, Glauber's salt, rock salt, etc.) deposits, the drilling water-soluble mining method is adopted at home and abroad, that is, the drilling equipment is used to drill the drill bit to the target layer through the drill pipe, and then enter the The production casing and the center pipe are completed, and the construction process of a new well is completed. By injecting water into the center pipe or casing, the injection agent is injected into the underground resource layer to dissolve the resources, and the solution becomes the original brine and returns to the surface, which is completed. a mining process. However, with the continuous deepening of mining, a large amount of injection agent is injecte...

Claims

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Application Information

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IPC IPC(8): E21B33/13C09K8/42C09K8/467
CPCE21B33/13C09K8/426C09K8/467
Inventor 李山岭吴巴特尔杨帆王上行李守刚刘二明李华伟
Owner HENAN ZHONGYUAN CHEM
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