High-temperature diverting acid composition and preparation method thereof

A technology for diverting acid and composition, applied in the field of high-temperature diverting acid composition and its preparation, can solve the problems of not giving temperature resistance test data, difficult to control secondary precipitation, complex formation components, etc., and achieve good temperature resistance. performance, improve iron stabilization ability, and relieve reservoir pollution

Active Publication Date: 2020-09-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] CN 201210219382.8 discloses a steering agent that mixes butanol, ethyl bromide, and N-alkyl-N-dioctadecane and reacts at 70-75°C for 6-6.5 hours. The prepared steering acid has a temperature resistance of 150°C. However, no test data for temperature resistance
[0012] The existing diverting acid can achieve good diversion of heterogeneous reservoirs, but the temperature resistance is within 160°C, and the acid liquid system used in the field is within 150°C. The resistance reduction rate of the existing diverting acid in field application has been publicly reported All of them are lower than 60%, and the literature reporting the temperature resistance, steering performance, corrosion performance and iron stabilizing ability of the temperature-resistant 180°C steering acid does not involve
With the development of exploration and development to deep reservoirs, there are more and more reservoirs with a formation temperature of 180°C, and the formation components are complex, such as sulfuric acid gas wells with rich pyrite formations, and secondary precipitation after acidification is difficult to control , the existing system is difficult to meet the needs of this type of reservoir transformation, it is necessary to develop a new type of steering acid with good temperature resistance, good retarding effect, low friction, and less secondary damage to the reservoir

Method used

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  • High-temperature diverting acid composition and preparation method thereof
  • High-temperature diverting acid composition and preparation method thereof
  • High-temperature diverting acid composition and preparation method thereof

Examples

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Embodiment 1

[0089] This embodiment provides a high temperature steering acid composition with a total volume of 100m 3 , including the following composition: industrial hydrochloric acid 61.5m with a concentration of 31.6% 3 , corrosion inhibitor 1000kg, iron ion stabilizer 1000kg, corrosion inhibitor additive 500kg, iron ion stabilizer additive 500kg, high temperature stabilizer 75kg, retarder 5m 3 , steering agent 3m 3 , and the rest is water.

[0090] Wherein, the corrosion inhibitor includes aldehyde, ketone, amine condensate, acetylenic alcohol, synergist, alcohol solvent and the first dispersant, and the mass ratio is 30:12:5:15:1. Among them, the aldehyde, ketone, and amine condensates contain three or more N and O atoms and π bonds.

[0091] Aldehydes, ketones and amine condensates are obtained by reacting aldehydes, ketones and amines at a molar ratio of 0.8:1.2:1.2 at 85°C for 240 minutes.

[0092] Aldehydes include formaldehyde, paraformaldehyde and benzaldehyde, and their ...

Embodiment 2

[0111] This embodiment provides a high temperature steering acid composition with a total volume of 100m 3 , including the following composition: industrial hydrochloric acid 61.5m with a concentration of 31.6% 3 , corrosion inhibitor 1000kg, iron ion stabilizer 1500kg, corrosion inhibitor 500kg, iron ion stabilizer auxiliary 1000kg, high temperature stabilizer 75kg, retarder 5m 3 , steering agent 4m 3 , and the rest is water.

[0112] Wherein, the corrosion inhibitor includes aldehyde, ketone and amine condensate, acetylenic alcohol, synergist, alcohol solvent and first dispersant, and the mass ratio is 40:20:20:25:5. Among them, the aldehyde, ketone, and amine condensates contain three or more N and O atoms and π bonds.

[0113] The aldehyde, ketone and amine condensates are obtained by reacting aldehydes, ketones and amines at a molar ratio of 0.8:1.6:1.5 at 90°C for 260 minutes.

[0114] Aldehydes include formaldehyde, paraformaldehyde and benzaldehyde, and their mass ...

Embodiment 3

[0134] This embodiment provides a high temperature steering acid composition with a total volume of 100m 3 , including the following composition: industrial hydrochloric acid 61.5m with a concentration of 31.6% 3 , corrosion inhibitor 2000kg, iron ion stabilizer 1500kg, corrosion inhibitor additive 1000kg, iron ion stabilizer additive 1500kg, high temperature stabilizer 100kg, retarder 6m 3 , steering agent 6m 3 , and the rest is water.

[0135] Wherein the corrosion inhibitor includes aldehyde, ketone and amine condensate, acetylenic alcohol, synergist, alcohol solvent and first dispersant, and the mass ratio is 60:12:5:15:10. Among them, the aldehyde, ketone and amine condensation products contain three or more N, O atoms and π bonds.

[0136] The aldehyde, ketone and amine condensates are obtained by reacting aldehydes, ketones and amines at a molar ratio of 1:1.4:1.5 at 90°C for 260 minutes.

[0137] Aldehydes include formaldehyde, paraformaldehyde and benzaldehyde, an...

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Abstract

The invention provides a high-temperature diverting acid composition and a preparation method thereof. The high-temperature diverting acid composition is prepared from the following components in percentage by mass: 10-25% of hydrochloric acid; 1-4.5% of a corrosion inhibitor; 1.5-3% of an iron ion stabilizer; 0.5-2.5% of a corrosion inhibition auxiliary agent; 0.5-3% of an iron ion stabilizer auxiliary agent; 0.075-0.125% of a high-temperature stabilizer; 5-10% of a retarder; 3-8% of a diverting agent; and the balance of water. The diverting acid composition disclosed by the invention can beapplied to acidification transformation of a high-temperature reservoir under the conditions of the temperature of 180 DEG C, the iron ion content of 5000ppm and the high hydrogen sulfide content (theH2S content reaches 10%); the system is injected into a stratum, after the system reacts with a reservoir, the viscosity of acid liquor is increased, plugging steering pressure is larger than 6 MPa,a high-permeability reservoir is temporarily plugged, the acid liquor flows to a low-permeability reservoir; the system is good in resistance reduction performance (the resistance reduction rate is larger than 60%) and good in retarding performance; and the purposes of uniform acid distribution and deep acidification of cores with a 60-time permeability range are achieved.

Description

technical field [0001] The invention belongs to the field of reservoir reconstruction in the process of oil and gas development. More specifically, it relates to a high-temperature steering acid composition and a preparation method thereof. Background technique [0002] Acidizing is an effective technology for increasing production of oil and gas wells and injection wells. In actual oil and gas reservoirs, the heterogeneity is serious, and the conventional acidizing fluid enters along the high-permeability layer, and it is difficult to effectively acidize the low-permeability reservoir, which seriously affects the effect of acidizing operation. In order to achieve the transformation of heterogeneous oil and gas reservoirs, the acid liquid system capable of plugging and diverting is commonly used at home and abroad, that is, diverting acid for acidizing operations. Steering acid is usually added viscoelastic surfactant to conventional acidizing liquid, so that the acid liqu...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C09K8/74
CPCC09K8/74C09K8/604C09K2208/32
Inventor王道成孙川吴文刚张燕王川张倩刘爽原励杜国滨荣元帅张兴德
OwnerPETROCHINA CO LTD