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In-situ synthesis micro-foam diverting acidizing fluid, acidizing diverting method and application

An in-situ authigenic, acidizing and diverting technology is applied in the fields of chemical instruments and methods, earthwork drilling, drilling compositions, etc. It can solve the problems of high single well construction cost and restrictions on mass promotion and application, and achieve large bond energy, Wide application range and high density effect

Active Publication Date: 2019-12-20
兰州凯宏中原石油科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The on-site construction of the foam acidification process requires a lot of additional equipment, such as special nitrogen generators, foam generators, etc., which makes the construction cost of a single well relatively high, thus greatly limiting its extensive application in oilfield sites

Method used

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  • In-situ synthesis micro-foam diverting acidizing fluid, acidizing diverting method and application
  • In-situ synthesis micro-foam diverting acidizing fluid, acidizing diverting method and application
  • In-situ synthesis micro-foam diverting acidizing fluid, acidizing diverting method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The indoor simulation experiment of an oilfield core is taken as an example to illustrate.

[0052] Flow experiments using carbonate cores with different permeability simulate the fluid permeability in the reservoir due to reservoir heterogeneity under formation conditions. The core is from the Longwangmiao Formation core in Anyue, Sichuan, numbered 1#. 1# core: diameter 2.36cm, porosity 30.5%, permeability 698×10 -3 μm 2 , the simulated temperature is 60°C, and the pressure is 1MPa.

[0053] Preparation of acid solution: (1) In-situ self-generated micro-foam turning acidification solution (pre-acid solution) includes: 15% hydrochloric acid, 0.5% fatty alcohol polyoxyethylene polyoxypropylene ether, 0.2% corrosion inhibitor uropine, 0.5% anti-swelling agent ammonium chloride, the balance is active water. (2) The main acid solution includes: 20% hydrochloric acid, 0.5% corrosion inhibitor utolopine, 0.5% clay anti-swelling agent, 0.5% anti-residual acid emulsifier, 0...

Embodiment 2

[0058] The indoor simulation experiment of an oilfield core is taken as an example to illustrate.

[0059] Flow experiments using carbonate cores with different permeability simulate the fluid permeability in the reservoir due to reservoir heterogeneity under formation conditions. The core is from the Longwangmiao Formation core in Anyue, Sichuan, numbered 2#. 2# core: diameter 2.68cm, porosity 28.7%, permeability 590×10 -3 μm 2 , the simulated temperature is 60°C, and the pressure is 2MPa.

[0060] Prepare the acid solution (the turning acidification solution of self-generated microfoam in situ in the present invention), including: 18% hydrochloric acid, 0.8% polyethylene glycol perfluorobutyrate, 0.3% corrosion inhibitor tannic acid, 0.7% anti-swelling agent two Zirconium oxychloride, the balance is active water. See Table 2 for the composition of the diverting acidification solution of in-situ self-generated microfoam.

[0061] The diverting acidizing liquid of the sel...

Embodiment 3

[0065] The indoor simulation experiment of an oilfield core is taken as an example to illustrate.

[0066] Flow experiments using carbonate cores with different permeability simulate the fluid permeability in the reservoir due to reservoir heterogeneity under formation conditions. The core is from the Longwangmiao Formation in Anyue, Sichuan, numbered 3#. 3# core: diameter 2.46cm, porosity 31.4%, permeability 627×10 -3 μm 2 , the simulated temperature is 60°C, and the pressure is 2MPa.

[0067] Preparation of acid solution (in-situ self-generated microfoam turning acidification solution of the present invention), including: 20% hydrochloric acid, 1.0% fatty alcohol polyoxyethylene polyoxypropylene ether, 1.0% corrosion inhibitor rhodin, 1.0% anti-swelling agent guanidine salt , and the balance is active water. Table 3 shows the composition of the diverting acidification solution for the in-situ self-generated microfoam.

[0068] The diverting acidizing liquid of the self-...

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Abstract

The invention provides an in-situ synthesis micro-foam diverting acidizing fluid and an acidizing diverting method and application. The diverting acidizing fluid comprises 15%-20% of hydrochloric acid, 0.2%-1.0% of a corrosion inhibitor, 0.5%-1.0% of an anti-swelling agent, 0.5%-1.0% of a surfactant, and the balance of water, and no gas is introduced; and the surfactant is fatty alcohol polyoxyethylene polyoxypropylene ether, nonylphenol polyoxyethylene ether or polyethylene glycol perfluorobutyrate. CO2 micro-foams are spontaneously formed in situ in a stratum, gas injection equipment, a foamgenerator and the like are not needed, the construction procedure of foam acidification is greatly simplified, and the construction cost is reduced.

Description

technical field [0001] The invention belongs to the field of oil and gas exploitation, and in particular relates to an in-situ self-generated microfoam diverting acidizing fluid, an acidizing diverting method and its application. Background technique [0002] Acid fracturing technology is one of the important means for the exploration and development of carbonate reservoirs, increasing production and stabilizing production. For carbonate reservoirs, during the acidizing process, a large number of acid-eroded wormholes are generated due to the reaction of acid and reservoir rocks, which further increases the permeability difference between reservoirs and makes the carbonate reservoirs turn. It is more difficult than sandstone reservoirs. Traditional acidification diversion technology, the conventional acidification diversion fluid system usually preferentially penetrates the high permeability part or large pores of the reservoir. When ordinary hydrochloric acid acidifies the...

Claims

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Application Information

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IPC IPC(8): C09K8/74C09K8/70E21B43/27
CPCC09K8/74C09K8/70E21B43/26
Inventor 燕永利奚琪
Owner 兰州凯宏中原石油科技有限公司
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