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Self-generating foam kill fluid and preparation method and self-generating foam composition

A self-generating foam and composition technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as difficult to achieve stirring speed, limited lifting space, easy to explode, etc., to achieve convenient preparation, low damage, good stability effect

Inactive Publication Date: 2017-07-07
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the injection of nitrogen requires special vehicles and special pumps, and the cost is high; the injection of air will cause the oxygen in the air to mix with the natural gas in the well, which is prone to explosion; at the same time, due to the limitations of the conditions on the job site, The way of mixing air with high-speed stirring is also difficult to achieve the stirring speed of the laboratory in actual operation
Secondly, although the conventional foam killing fluid can improve the stability of the foam by adding polymers, the room for improvement is limited

Method used

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  • Self-generating foam kill fluid and preparation method and self-generating foam composition
  • Self-generating foam kill fluid and preparation method and self-generating foam composition

Examples

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preparation example Construction

[0026] A preparation method of the self-generating foam well killing fluid includes: mixing the foaming agent after stirring and foaming with a polymer and a crosslinking agent to obtain a gel material. The gel material is then mixed with the gas generating agent.

[0027] Among them, the gel material is a high-deformation gel that does not flow or almost does not flow. According to the ten-grade evaluation standard for plugging agent gel strength proposed by Sydansk et al., it belongs to grades E to F. The gel at this strength is more suitable for mixing in the gas phase to obtain a well-killing fluid with good elasticity and moderate viscosity, which is conducive to the establishment of wellbore circulation during well-killing operations.

[0028] It is worth noting that, in addition to the above methods, the foaming agent can also be stirred uniformly until a certain foam is obtained, and then the polymer, crosslinking agent and gas generating agent are added in sequence an...

Embodiment 1

[0031] This embodiment provides a self-generating foam composition, which includes: polyacrylamide 3wt%, alkyl glucoside and sodium dodecylsulfonate 2wt%, chromium acetate 0.1wt%, polyethyleneimine 1wt%, acid substances (malic acid and citric acid) 0.021mol / L, carbonate (anhydrous sodium carbonate and sodium bicarbonate) 0.021mol / L and the balance of deionized water.

[0032] This embodiment also provides a self-generating foam kill fluid prepared from the above-mentioned self-generating foam composition, the preparation method of which comprises:

[0033] S1: Add alkyl glucoside, polyacrylamide, chromium acetate and polyethyleneimine in sequence in deionized water, and stir evenly with a glass rod to obtain a gel material;

[0034] S2: Mix the above-mentioned gel material with malic acid and anhydrous sodium carbonate, and stir evenly with a glass rod to obtain the autogenous foam killing fluid.

Embodiment 2

[0036]This embodiment provides a self-generating foam composition, which includes: polyacrylamide 3wt%, betaine and sodium dodecylbenzenesulfonate 4wt%, chromium acetate 0.2wt%, polyethyleneimine 2wt%, acid substances (malic acid and dihydrate oxalic acid) 0.034mol / L, carbonate (anhydrous sodium carbonate and ammonium bicarbonate) 0.034mol / L and the balance of deionized water.

[0037] This embodiment also provides a self-generating foam kill fluid prepared from the above-mentioned self-generating foam composition, the preparation method of which comprises:

[0038] S1: Add betaine, polyacrylamide, chromium acetate and polyethyleneimine in sequence in deionized water, and stir evenly with a glass rod to obtain a gel material;

[0039] S2: Mix the above-mentioned gel material with malic acid and anhydrous sodium carbonate, and stir evenly with a glass rod to obtain the autogenous foam killing fluid.

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Abstract

A self-generating foam composition relates to the field of oilfield chemistry. The self-generating foam composition comprises 2-6wt% of a polymer, 0.1-3wt% of a crosslinking agent, 1-3wt% of a foaming agent, 6-10wt% of a blowing agent and the balance of water. The blowing agent comprises carbonate and an acid substance. The mass ratio of the acid substance and carbonate in the blowing agent is 1: (1-3). A self-generating foam kill fluid forms a gel by taking the polymer and the crosslinking agent as a framework and has the characteristics of being low in density, low in damage and good in stability by taking carbon dioxide generated by a reaction on carbonate and the acid substance as gas filling. A preparation method of the self-generating foam kill fluid is quite simple in preparation process and is free of gas injecting equipment and high-speed stirring equipment. The self-generating foam kill fluid can be obtained by simple mixing. Limited production conditions can be met, and the production cost is hugely lowered.

Description

technical field [0001] The invention relates to the field of oilfield chemistry, in particular to a self-generating foam well killing fluid, a preparation method thereof and a self-generating foam composition. Background technique [0002] In the later stages of production and development of oil and gas fields, the formation pressure attenuates significantly, and the density of the conventionally used killing fluid is much higher than the formation pressure coefficient. There are problems such as easy leakage of the killing fluid and great damage to the reservoir. The foam kill fluid has the characteristics of low density, low loss, and little damage to the reservoir. It has been widely used in many oil and gas fields at home and abroad, and achieved good results. [0003] In the prior art, the source of the foam in the foam killing fluid mainly depends on the injection of nitrogen, air or the mixing of air through high-speed stirring. However, the injection of nitrogen req...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/38C09K8/518C09K8/512C09K8/514C09K8/42
CPCC09K8/38C09K8/426C09K8/5083C09K8/512C09K8/514C09K8/518
Inventor 杨欣雨贾虎陈昊吴晓虎
Owner SOUTHWEST PETROLEUM UNIV
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