Energy enhancing steering acid liquid system

A system and acid technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of oil and gas reservoir depletion, water lock damage, poor effect on deep stimulation, etc., achieve good friction reduction performance, improve Flowback capability, easy pumping effect

Inactive Publication Date: 2012-05-09
CNPC CHUANQING DRILLING ENG DOWNHOLE OPERATION
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0002] At present, the development of most oil and gas reservoirs has two main features in common: First, in order to improve the development efficiency of oil and gas wells, there are more and more vertical wells, highly deviated wells, and horizontal wells with multi-sections, which have long well sections and uneven well sections. Due to the strong qualitative characteristics, it is difficult to uniformly distribute acid during acidification, and it is necessary to obtain more uniform acid distribution through acid diversion during acidification; secondly, most oil and gas reservoirs are old oil and gas reservoirs, and due to the rapid development speed, the oil and gas reservoirs are seriously depleted , the current formation pressure coefficient is decreasing day by day (for example, the current formation pressure coefficient of the main gas reservoir in the Sichuan Basin - the Carboniferous in eastern Sichuan is generally <0.7). The energy-enhancing effect in acidification is used to improve the flowback ability of raffinate and improve its flowback and production stimulation effects. Therefore, many oil and gas reservoir reconstructions urgently need an energy-enhancing acid system with good steering performance, strong flowback ability, and low damage. craft
[0003] In the existing technology, the liquid method used in the past for the reconstruction of difficult reservoirs with uniform acid distribution is to increase the viscosity of the liquid, mainly using gelled acid containing polymers, but due to the low viscosity (generally <40mPa.s), the steering performance It is not ideal, and the addition of polymers is more harmful to the reservoir and has no energy-enhancing effect; for the acidification reform of low-pressure and water-sensitive reservoirs, the conventional foam acid system is mainly used. Although the problem of residual liquid flowback is solved, the depth Poor effect on transformation

Method used

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Embodiment 1

[0021] An energy-enhancing diverting acid solution system, comprising: 615 parts of hydrochloric acid, 10 parts of a corrosion inhibitor, 30 parts of a diverting agent, 10 parts of a foam booster, and 10 parts of an iron ion stabilizer.

[0022] The acid viscosity of the energized steering acid liquid system is 15mPa·s~25 mPa·s, and the resistance reduction rate is 40%~50%; when the acid concentration is reacted from 20% to 8%~10%, the viscosity increase value is ≥ 80mPa·s; when the pressure coefficient is 0.41-0.7 and the foam quality is 15%-73%, the residual liquid flowback rate after acidification is >80%.

[0023] The corrosion inhibitor is a compound of Schiff's base, Pingpingjia, propynyl alcohol, and isopropanol, and the composite ratio is 40% of Schiff's base by mass percentage; Pingpingjia 5%; Proynyl alcohol 20%; Isopropanol 35%, no chemical reaction occurs between the complexes.

[0024] The diverting agent is docosyl dimethyl betaine.

[0025] The foam booster is...

Embodiment 2

[0028] An energized steering acid system to prepare 1m 3 Acid solution as an example, including: 615 parts of hydrochloric acid, 20 parts of corrosion inhibitor, 50 parts of steering agent, 20 parts of foam booster, and 20 parts of iron ion stabilizer.

[0029] The acid viscosity of the energized steering acid liquid system is 15mPa·s~25 mPa·s, and the resistance reduction rate is 40%~50%; when the acid concentration is reacted from 20% to 8%~10%, the viscosity increase value is ≥ 80mPa·s; when the pressure coefficient is 0.41-0.7 and the foam quality is 15%-73%, the residual liquid flowback rate after acidification is >80%.

Embodiment 3

[0031] An energized steering acid system to prepare 1m 3 Take acid liquid as an example, including: 615 parts of hydrochloric acid, 15 parts of corrosion inhibitor, 40 parts of steering agent, 15 parts of foam booster, and 17 parts of iron ion stabilizer.

[0032] The acid viscosity of the energized steering acid liquid system is 15mPa·s~25 mPa·s, and the resistance reduction rate is 40%~50%; when the acid concentration is reacted from 20% to 8%~10%, the viscosity increase value is ≥ 80mPa·s; when the pressure coefficient is 0.41-0.7 and the foam quality is 15%-73%, the residual liquid flowback rate after acidification is >80%.

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Abstract

The invention discloses an energy enhancing steering acid liquid system, which comprises 615 parts of hydrochloric acid, 10 to 20 parts of corrosion inhibitors, 30 to 50 parts of steering agents, 10 to 20 parts of foam boosters and 10 to 20 parts of iron ion stabilizing agents. The system has the advantages that liquid has better automatic steering low-seepage storage layers, the goals of uniformly distributing acid and reforming the storage layers with poor storage seepage conditions are reached, simultaneously, the static liquid post pressure of liquid in a well tube is also reduced, and the liquid return and discharge capability after the construction is improved.

Description

technical field [0001] The invention relates to an acid liquid system for acidizing and increasing production of oil and gas wells, in particular to an acid liquid system for reducing the net liquid column pressure of the wellbore, increasing the flowback capacity of residual acid, and at the same time automatically and continuously plugging and diverting in the construction reservoir . Background technique [0002] At present, the development of most oil and gas reservoirs has two main features in common: First, in order to improve the development efficiency of oil and gas wells, there are more and more vertical wells, highly deviated wells, and horizontal wells with multi-sections, which have long well sections and uneven well sections. Due to the strong qualitative characteristics, it is difficult to uniformly distribute acid during acidification, and it is necessary to obtain more uniform acid distribution through acid diversion during acidification; secondly, most oil a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74
Inventor 蔡远红蒲祖凤赵洪涛罗炽臻沈建国何启平刘楠李嘉蒋玲玲
Owner CNPC CHUANQING DRILLING ENG DOWNHOLE OPERATION
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