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Cementing additives and methods of use thereof

A cementing cement and additive technology, which is applied in the field of oil field cementing, can solve the problems of high water-solid ratio and low compressive strength, and achieve the effect of increasing strength, improving strength and salt resistance, and avoiding formation pressure leakage

Active Publication Date: 2022-06-17
BEIJING DADE GUANGYUAN PETROLEUM TECH SERVICE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the large water-solid ratio and external admixtures, low-density cement slurry generally has low compressive strength, and its environmental protection needs to be improved

Method used

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  • Cementing additives and methods of use thereof
  • Cementing additives and methods of use thereof

Examples

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example

[0058] Step 1, mixing sodium alginate with water with a mass ratio of 1:10, and adjusting the pH to 10 to obtain a mixed system;

[0059] Step 2, adding epichlorohydrin accounting for 5% of the mass of sodium alginate to the mixing system, reacting at 60° C. for 3.5 hours, adding absolute ethanol, suction filtration, and drying to obtain cross-linked sodium alginate;

[0060] Step 3: Dissolving the cross-linked sodium alginate in water, standing for defoaming, and preparing a cross-linked sodium alginate solution with a mass percentage of 4%;

[0061] Step 4. The cross-linked sodium alginate solution is extruded into a calcium chloride solution with a mass percentage of 3% through a spinneret, and the temperature of the coagulation bath is 40°C. Cross-linked calcium alginate fibers with a diameter of 200 μm, cut the cross-linked calcium alginate fibers to an average length of 0.5 mm;

[0062] Step 5. Mix the cement and water evenly to make cement slurry, take a quarter of the...

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Abstract

The invention discloses a well cementing additive and its application method. The cementing additive comprises the following components and their mass percentages in cement: 2-35% of high-strength hollow glass microspheres, 1% of microsilicon ~20%, cross-linked calcium alginate fiber 0.02~10%, retarder 0.01~3% and dispersant 0.01~3%. The cementing cement additive in the invention is used in combination with various raw materials, which can effectively reduce the density of the cementing slurry system and improve the cement strength, and can be used for cementing wells in low-pressure leaky formations.

Description

technical field [0001] The invention relates to the technical field of oilfield cementing. More specifically, the present invention relates to a cementing cement additive and method of use thereof. Background technique [0002] The oilfield drilling area has the characteristics of low pressure, low permeability, low pressure and high permeability, developed fractures, complex pressure system, etc., and its development difficulty is increasing. Easy to leak oil layer. Using conventional density cement slurry to seal oil and gas layers, the cement slurry column pressure is high, and the probability of leakage during cementing construction is high. With the further expansion of the exploration area and the increase of the drilling depth of oil wells, the leakage of wells in the oil interval is increasing year by year. This technical problem has become a bottleneck affecting the quality of cementing. Since the plugging effect in the completion stage is not ideal, a more effec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B18/14C04B28/00
CPCC04B40/0039C04B28/00C04B2111/00724C04B2201/50C04B14/22C04B18/146C04B16/0675C04B2103/22C04B2103/408Y02W30/91
Inventor 孟虎孙晓东王良超吴一平纪加范锋徐大光韩东
Owner BEIJING DADE GUANGYUAN PETROLEUM TECH SERVICE