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Slow blocking remover for deep part of oil and water well

A plugging agent, oil-water well technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of short effective period of production increase, secondary precipitation, ineffectiveness, etc.

Active Publication Date: 2013-08-14
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the conventional acidizing construction process, due to the fast reaction speed and short penetration distance of acid rock, it can only eliminate the damage in the near wellbore area, and it is difficult to work in the deep formation, and its effective period of stimulation is short
Moreover, conventional acidification is basically ineffective for the sulfate scale generated by the incompatibility of injection water and formation water.
[0004] Aiming at the above-mentioned status quo, breaking through the key technical problems such as the inability of conventional plugging removers to dissolve sulfate scale, or secondary precipitation after dissolution, a slow-speed plugging remover for deep oil-water wells has been developed, which mainly reduces oil-water interfacial tension and inhibits Clay swelling can solve the fouling and clogging in the near-wellbore area and deep formation, improve the seepage capacity of injected water, and achieve the purpose of reducing pressure and increasing injection

Method used

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  • Slow blocking remover for deep part of oil and water well
  • Slow blocking remover for deep part of oil and water well
  • Slow blocking remover for deep part of oil and water well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Embodiment 1: The weight percent of each component of the oil-water well deep retarding plugging removal agent is:

[0050] 1. Sodium dodecylbenzenesulfonate (industrial product): 1.5%;

[0051] 2. Sodium ethylenediamine tetramethylene phosphonate (industrial product): 5.5%;

[0052] 3. Sodium diethylenetriaminepentaacetate (industrial product): 25.5%;

[0053] 4. Methanesulfonic acid (industrial product): 15.5%;

[0054] 5. Sodium acetate (industrial product): 0.5%;

[0055] 6. Water: 51.5%.

[0056] Preparation method: first, add sodium dodecylbenzenesulfonate, sodium ethylenediaminetetramethylene phosphonate, and sodium diethylenetriaminepentaacetate into a steel reaction kettle with a capacity of 1000 liters according to the above ratio, and put them under normal temperature Stir well. Secondly, under continuous stirring, first add 10% of the water that needs to be added and continue to stir for 30 minutes, then add methanesulfonic acid and sodium acetate in se...

Embodiment 2

[0058] Embodiment 2: The weight percent of each component of the oil-water well deep retarding plugging removal agent is:

[0059] 1. Sodium dodecylbenzenesulfonate (industrial product): 1.7%;

[0060] 2. Sodium ethylenediamine tetramethylene phosphonate (industrial product): 6.1%;

[0061] 3. Sodium diethylenetriaminepentaacetate (industrial product): 23.5%;

[0062] 4. Methanesulfonic acid (industrial product): 16.2%;

[0063] 5. Sodium acetate (industrial product): 0.6%;

[0064] 6. Water: 51.9%.

[0065] The daily oil production of the second oil well (YD5-8) was 0.27t / d before the plugging removal measures, and the daily oil production was 1.42t / d after the measures, with a daily increase of 1.15t / d.

Embodiment 3

[0066] Embodiment 3: The weight percent of each component of the slow-speed plugging removal agent in the deep part of the water injection well is:

[0067] 1. Sodium dodecylbenzenesulfonate (industrial product): 1.85%;

[0068] 2. Sodium ethylenediamine tetramethylene phosphonate (industrial product): 6.8%;

[0069] 3. Sodium diethylenetriaminepentaacetate (industrial product): 22.0%;

[0070] 4. Methanesulfonic acid (industrial product): 16.8%;

[0071] 5. Sodium acetate (industrial product): 0.8%;

[0072] 6. Water: 51.75%.

[0073] The water injection pressure of the first water injection well (D91-41) was 18MPa before the plugging removal measures, and the water injection pressure decreased to 14.6MPa under the condition of constant injection volume, which is 18.9% lower than the injection pressure.

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Abstract

The invention relates to a slow blocking remover for a deep part of an oil and water well. The slow blocking remover comprises following components by weight: 1.5-2.0% of sodium dodecyl benzene sulfonate, 5.5-7.5% of ethylene diamine tetra (methylene phosphonic acid) sodium, 20.0-25.5% of diethylenetriam inepentaacetate, 15.5-17.5% of methanesulfonic acid, 0.5-1% of sodium acetate, and the balance water. The blocking remover not only can remove scaling and blocking of near-wellbore, but also can remove scaling and blocking of the deep part of stratum, and finally reaches purposes of yield increase of the oil well and injection increase of a water injection well.

Description

technical field [0001] The invention relates to a chemical plugging removal agent, in particular to a plugging removal agent applied to deep slowing of oil-water wells. Background technique [0002] With the continuous deepening of oilfield development, water injection wells generally have problems of high injection pressure, insufficient injection and water injection, which seriously affect the increase and stability of oilfield production. The main reasons are as follows: firstly, the characteristics of low porosity and low permeability make the injected water have obvious start-up pressure gradient under the condition of low-velocity seepage; secondly, the injected water is not compatible with the formation water during the water flooding process, which causes serious blockage in the deep formation; The third is the damage of water lock and Jamin effect to the reservoir. Therefore, effectively reducing the water injection pressure and solving the problem of no water inje...

Claims

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Application Information

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IPC IPC(8): C09K8/528C09K8/52
Inventor 刘宁杨全安曾亚勤何治武杨立华唐泽玮姜毅杨会丽李宁军张振云董俊刘爱华王小勇周佩
Owner PETROCHINA CO LTD
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