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Diverting acid for carrying out acidification and transformation on high-temperature oil and gas well with long well segment

A technology for oil and gas wells and diverting acid, which is applied in the field of diverting acid, which can solve the problems of easy flowback secondary damage of foam technology, limited diverting ability, and high temperature resistance, etc., and achieves remarkable acidizing effect, improved acidizing effect, and good diverting effect Effect

Inactive Publication Date: 2012-07-18
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Utilizing the principle that the stability of foam in high and low permeability layers is different, and the effect of foam on liquid phase flow in high permeability layers is greater than that in low permeability layers, the foam steering technology has been developed. Foam technology is easy to flow back and has low secondary damage, but construction High pumping pressure, low temperature resistance, and limited steering ability limit the application of foam steering
Polymer in-situ gelation and diversion technology adds polymers to the acid solution, and under the action of high-valent cations Fe(III) and Zr(IV), cross-linking occurs in situ to produce high-viscosity jelly to divert the acid solution. The diversion effect is better, but the polymer residue will reduce the permeability of the reservoir and cause secondary damage

Method used

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  • Diverting acid for carrying out acidification and transformation on high-temperature oil and gas well with long well segment
  • Diverting acid for carrying out acidification and transformation on high-temperature oil and gas well with long well segment
  • Diverting acid for carrying out acidification and transformation on high-temperature oil and gas well with long well segment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] According to 4.5% octadecanoyl ethyl dimethyl betaine, 1.0% β-diethylamino phenyl ketone, 1.0% isoascorbic acid, 20% hydrochloric acid, and the balance is water to configure the steering acid.

[0042] This example turns to acid samples, the initial viscosity of fresh acid is 20.4mPa.s, and the dynamic corrosion rate of acid solution at 120°C is 5.4g / m 2 .h, the viscosity of the system is 155mPa.s when it reacts with rock to an acid concentration of 8%; the system viscosity is 25mPa.s when it reacts to an acid concentration of 5%; the system viscosity is 11mPa.s when it reacts to an acid concentration of 1.5%.

Embodiment 2

[0044] According to 5.0% octadecamidoethyl betaine, 2.0% β-diethylamino phenyl ketone, 2.0% isoascorbic acid, 20% hydrochloric acid, and the balance is water, configure the steering acid.

[0045] This example turns to acid samples, the initial viscosity of fresh acid is 28.4mPa.s, and the dynamic corrosion rate of acid solution at 120°C is 4.8g / m 2 .h, the viscosity of the system is 336mPa.s when it reacts with rock to an acid concentration of 8%, the system viscosity is 25.0mPa.s when it reacts to an acid concentration of 5%, and the system viscosity is 24.3mPa.s when it reacts to an acid concentration of 1.5%. Acid viscosity-time curve see figure 1 and figure 2 .

Embodiment 3

[0047]According to 4.5% stearyl amino ethyl dimethyl betaine, 1.5% β-diethylamino phenyl ketone, 1.5% isoascorbic acid, 20% hydrochloric acid, and the balance is water to configure the steering acid.

[0048] This example turns to acid samples, the initial viscosity of fresh acid is 20.4mPa.s, and the dynamic corrosion rate of acid solution at 120°C is 5.1g / m 2 .h, the viscosity of the system is 162.5mPa.s when it reacts with the rock to an acid concentration of 8%, the system viscosity is 22.0mPa.s when it reacts to an acid concentration of 5%, and the system viscosity is 12.6mPa.s when it reacts to an acid concentration of 1.5%.

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Abstract

The invention relates to diverting acid for carrying out acidification and transformation on a high-temperature oil and gas well with a long well segment, which comprises the following components: 4.5 to 5.0 percent by mass of diverter octadecanoyl amido ethyl dimethylamine betaine, 1.0 to 2.0 percent by mass of corrosion inhibitor Mannich base, 1.0 to 2.0 percent by mass of ferric ion stabilizererythorbic acid or sodium erythorbate, 20 percent by mass of hydrochloric acid and the balance water. According to the invention, the characteristic that the diverting acid has different molecule aggregation morphologies and aggregation numbers under different pH values is utilized; the high temperature resistance diverting acid with viscoelasticity is prepared by adding the corrosion inhibitor Mannich base and the ferric ion stabilizer erythorbic acid or sodium erythorbate; and after the diverting acid is injected into a formation, the viscosity of the acid is rapidly improved along with theconsumption of the acid and the injection pressure at the bottom of the well also rises along with the consumption of the acid, so that the acid is forced to permeate and divert toward the formation,a reservoir is uniformly acidified and the acidification effect is obviously improved.

Description

Technical field [0001] The invention relates to a diverting acid for oil and gas well acidizing construction, in particular to a diverting acid for long well section and heterogeneous high temperature deep well acidizing construction. Background technique [0002] Drilling and completion construction will cause oil and gas layer pollution and reduce oil and gas output. Acidizing is mainly used to remove pollution near the wellbore, expand oil flow channels in low-permeability layers, and restore or increase the production of oil and gas wells. However, due to the uneven distribution of pollution and damage in the reservoir, and the heterogeneity among the reservoirs, the permeability of each layer is very different, especially for highly deviated wells with long open well sections and high open degrees. And horizontal wells, the conventional acidizing process or acid liquid is not only difficult to remove the unevenly distributed pollution blockage, but will increase the ex...

Claims

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Application Information

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IPC IPC(8): C09K8/74
Inventor 李勇明赵金洲陈红军方天成
Owner SOUTHWEST PETROLEUM UNIV
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