CN1483920A - Agent for acidizing sandstone oil reservoir - Google Patents
Agent for acidizing sandstone oil reservoir Download PDFInfo
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- CN1483920A CN1483920A CNA021317445A CN02131744A CN1483920A CN 1483920 A CN1483920 A CN 1483920A CN A021317445 A CNA021317445 A CN A021317445A CN 02131744 A CN02131744 A CN 02131744A CN 1483920 A CN1483920 A CN 1483920A
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- acid
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- hcl
- clay stabilizer
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Abstract
The present invention relates to a sandstone reservoir acidizing agent, belonging to the field of oil-gas field development technology. It is composed of 1-20% of inorganic acid, 0.1-10% of organic acid, 0.01%-5% of iron ion stabilizing agent, 1-15% of concentrated acid, 1-15% of micellar acid, 0.01-5% of cleanup additive, 0.01%-5% of non-emulsifying-demulsifying agent, 0.01%-10% of stabilizing agent, 0.01-10% of clay stabilizing agent and 5-96.4% of water, the sum of the weight percentages of all the components is 100%. The treatment radius of said system can be up to 2m-3m, can effectively stabilize iron ion, and can prevent production of secondary precipitation.
Description
Affiliated technical field: exploitation of oil-gas field
Background technology:
Acidizing sandstone oil reservoir adopts three class acid at present, and a class is an inorganic acid: the nitric acid of the hydrochloric acid of 5%-15%, the hydrofluoric acid of 3%-8%, 5%-8%, the phosphoric acid of 5%-10%; Another kind of is organic acid: the sulfamic acid of 5%-10% acetate, 5%-10% formic acid, 5%-10% propionic acid, 3%-8% chloroacetic acid, 5%-10%, the aryl sulfonic acid of 5%-10%; The 3rd class is ester, 5%-10% halogenated hydrocarbons, 5%-10% halogen, 5%-10% carboxylic acid halides, 5%-10% acid anhydrides, the 5%-10% fluoboric acid of potential acid: 5%-10%.Short only 30min-40min of first kind acid reaction time, treatment radius easily produces the secondary precipitation of irony hydroxide less than 1.0m, stops up formation pore again, causes acidizing effect poor; Longer 60min-100min of the second class acid reaction time, higher 1000 yuan of-2000 yuan/m of cost
3Long 150min-200min of the 3rd class acid reaction time, higher 2000 yuan of-3000 yuan/m of cost
3
Acid additive has at present: acidification corrosion inhibitor, iron stabilizers, clay stabilizer, surfactant.
The purpose of invention:
Acidifying is commonly usedly in the sandstone oil reservoir development process to remove one of the measure of polluting the near wellbore zone, but easily produces the secondary precipitation of irony hydroxide during conventional inorganic acid acidifying, stops up formation pore again, and acidizing effect is poor, and the acidification radius is little, and period of validity is short.Big but the cost height of organic acid, potential sour acidification radius.This acid system treatment radius can reach 2m-3m more greatly, can effectively stablize iron ion, prevents the generation of irony hydroxide secondary precipitation, and cost is not high, only 500 yuan of-700 yuan/m
3, the acidification to dispel block effect is remarkable.
Technical scheme:
This method working procedure is: just for the reaction of pretreatment fluid → closing well, return and discharge residual acid, just 1. → just squeeze insulating liquid and 2. → just squeeze main acid → just squeezing rearmounted acid for prepad fluid → just squeezing insulating liquid, after the closing well reaction, the residual acid of emptying recovers normal water filling.
Be specially (following each slug all is weight percentage with the agent composition):
(1), pretreatment fluid
The borehole of wash oil inside pipe wall and target zone reduces the construction pump pressure.Form by following component:
Hydrochloric acid (HCl) 10%-15%+ clay stabilizer (NH
4Cl) 0.01%-5%+ corrosion inhibiter (ZX-01) quinoline quaternary ammonium salt compound 0.01%-5.0%+ activating agent (SP-169) 0.01%-5%+ water 70%-89.97%
(2), prepad fluid
Carbonate composition in the dissolving stratum and isolation formation water are avoided the generation of secondary precipitations such as prodan, potassium fluosilicate and calcirm-fluoride.Form by following component:
Acetic acid (HAc) 0.1%-5%+ hydrochloric acid (HCl) 1%-15%+ clay stabilizer (NH
4Cl) anti-breast-demulsifier (OP-10) 0.01%-5%+ water 60%-98.86% of 0.01-5%+ corrosion inhibiter (ZX-01) quinoline quaternary ammonium salt compound 0.01%-5%+ ferrous stability (NTS) phosphate compounds 0.01%-5.0%+
(3), insulating liquid 1.
Isolate preposition acid and main acid, keep the pH value (pH value≤2) of acid solution, prevent secondary precipitation, preposition acid is pushed the depths, stratum.Form by following component:
Acetic acid (HAc) 5%-10%+ hydrochloric acid (HCl) 5%-20%+ clay stabilizer (NH
4Cl) the mixture 1%-15%+ water 35%-88.98% of 0.01-10.0%+ corrosion inhibiter (ZX-01) quinoline quaternary ammonium salt compound 0.01%-10.0%+ micella acid (JS841) fusel oil, ethanol, inorganic acid
(4), insulating liquid 2.
Isolate preposition acid and main acid, keep the pH value of acid solution, prevent secondary precipitation, preposition acid is pushed the depths, stratum.Form by following component:
Acetic acid (HAc) 5%-10%+ hydrochloric acid (HCl) 5%-20%+HF stabilizing agent (NH
4HF) the mixture 1%-15%+ water 35%-88.98% of 0.01-10.0%+ corrosion inhibiter (ZX-01) quinoline quaternary ammonium salt compound 0.01%-10.0%+ micella acid (JS841) fusel oil, ethanol, inorganic acid
(5), main acid
The releasing earth formation deep stops up.Form by following component:
The mixture 1%-15%+ clay stabilizer (NH of acid of hydrochloric acid (HCl) 1%-15%+ hydrofluoric acid (HF) 1%-15%+ gelled acid (PACS851) multi-element, inorganic and surfactant mixture 1%-15%+ micella acid (JS841) fusel oil, ethanol, inorganic acid
4Cl) 0.01%-5%+ corrosion inhibiter (ZX-01) quinoline quaternary ammonium salt compound 0.01%-5%+ ferrous stability (NTS) phosphate compounds 0.01%-5%+ water 25%-95.97%
(6), rearmounted acid
Main acid is replaced into the stratum, keep the pH value, prevent secondary precipitation.Form by following component:
Hydrochloric acid (HCl) 1%-15%+ clay stabilizer (NH
4Cl) 0.01%-5%+ corrosion inhibiter (ZX-01) quinoline quaternary ammonium salt compound 0.01%-5%+ activating agent (SP-169) 0.01%-5%
The effect of invention:
This acid system is suitable for the sandstone oil reservoir that reservoir temperature is lower than 120 ℃, injects successively during construction, the row of returning after the closing well reaction finishes.Water injection pressure on average descends more than the 5MPa after the acidifying, day augmented injection 30m
3More than, more than the average effective phase 150d, the corresponding oil well of well group increases more than the oily 200t.
Application example 1:
(1). pretreatment fluid, form by following component:
Hydrochloric acid (HCl) 10%+ clay stabilizer (NH
4Cl) 0.01%+ corrosion inhibiter (ZX-01) 0.01%+ activating agent (SP-169) 0.01%+ water 89.97%
(2). prepad fluid, form by following component:
Acetic acid (HAc) 5%+ hydrochloric acid (HCl) 1%+ clay stabilizer (NH
4Cl) anti-breast-demulsifier (OP-10) 0.01%+ water 93.96% of 0.01%+ corrosion inhibiter (ZX-01) 0.01%+ ferrous stability (NTS) 0.01%+
(3). 1. insulating liquid is made up of following component:
Acetic acid (HAc) 10%+ hydrochloric acid (HCl) 5%+ clay stabilizer (NH
4Cl) 0.01+ corrosion inhibiter (ZX-01) 0.01%+ micella acid (JS841) 1%+ water 83.98%
(4). 2. insulating liquid is made up of following component:
Acetic acid (HAc) 10%+ hydrochloric acid (HCl) 5%+ stabilizing agent (NH
4HF) 0.01+ corrosion inhibiter (ZX-01) 0.01%+ micella acid (JS841) 1%+ water 83.98%
(5). main acid, form by following component:
Hydrochloric acid (HCl) 15%+ hydrofluoric acid (HF) 1%+ gelled acid (PACS851) 1%+ micella acid (JS841) 1%+ clay stabilizer (NH
4Cl) 0.01%+ corrosion inhibiter (ZX-01) 0.01%+ ferrous stability (NTS) 0.01%+ water 81.97%
(6). rearmounted acid, form by following component:
Hydrochloric acid (HCl) 15%+ clay stabilizer (NH
4Cl) 0.01%+ corrosion inhibiter (ZX-01) 0.01%+ activating agent (SP-169) 0.01%+ water 84.97%
Application example 2:
(1). pretreatment fluid, form by following component:
Hydrochloric acid (HCl) 10%+ clay stabilizer (NH
4Cl) 5%+ corrosion inhibiter (ZX-01) 5.0%+ activating agent (SP-169) 5%+ water 75%
(2). prepad fluid, form by following component:
Acetic acid (HAc) 0.1%+ hydrochloric acid (HCl) 15%+ clay stabilizer (NH
4Cl) anti-breast-demulsifier (OP-10) 5%+ water 64.9% of 5%+ corrosion inhibiter (ZX-01) 5%+ ferrous stability (NTS) 5.0%+
(3). 1. insulating liquid is made up of following component:
Acetic acid (HAc) 5%+ hydrochloric acid (HCl) 20%+ clay stabilizer (NH
4Cl) 10.0%+ corrosion inhibiter (ZX-01) 10.0%+ micella acid (JS841) 15%+ water 40%
(4). 2. insulating liquid is made up of following component:
Acetic acid (HAc) 5%+ hydrochloric acid (HCl) 20%+ stabilizing agent (NH
4HF) 10.0%+ corrosion inhibiter (ZX-01) 10.0%+ micella acid (JS841) 15%+ water 40%
(5). main acid, form by following component:
Hydrochloric acid (HCl) 1%+ hydrofluoric acid (HF) 15%+ gelled acid (PACS851) 15%+ micella acid (JS841) 15%+ clay stabilizer (NH
4Cl) 5%+ corrosion inhibiter (ZX-01) 5%+ ferrous stability (NTS) 5%+ water 39%
(6). rearmounted acid, form by following component:
Hydrochloric acid (HCl) 1%+ clay stabilizer (NH
4CL) 5%+ corrosion inhibiter (ZX-01) 5%+ activating agent (SP-169) 5%+ water 84%
Application example 3:
(1). pretreatment fluid, form by following component:
Hydrochloric acid (HCl) 12%+ clay stabilizer (NH
4Cl) 2%+ corrosion inhibiter (ZX-01) 2%+ activating agent (SP-169) 2%+ water 82%
(2). prepad fluid, form by following component:
Acetic acid (HAc) 2%+ hydrochloric acid (HCl) 12%+ clay stabilizer (NH
4Cl) anti-breast-demulsifier (OP-10) 2%+ water 78% of 2%+ corrosion inhibiter (ZX-01) 2%+ ferrous stability (NTS) 2%+
(3). 1. insulating liquid is made up of following component:
Acetic acid (HAc) 5%+ hydrochloric acid (HCl) 12%+ clay stabilizer (NH
4Cl) 1%+ corrosion inhibiter (ZX-01) 1%+ micella acid (JS841) 5%+ water 76%
(4). 2. insulating liquid is made up of following component:
Acetic acid (HAc) 5%+ hydrochloric acid (HCl) 12%+ stabilizing agent (NH
4HF) 1%+ corrosion inhibiter (ZX-01) 1%+ micella acid (JS841) 5%+ water 76%
(5). main acid, form by following component:
Hydrochloric acid (HCl) 8%+ hydrofluoric acid (HF) 3%+ gelled acid (PACS851) 5%+ micella acid (JS841) 5%+ clay stabilizer (NH
4Cl) 2%+ corrosion inhibiter (ZX-01) 1%+ ferrous stability (NTS) 1%+ water 75%
(6). rearmounted acid, form by following component:
Hydrochloric acid (HCl) 12%+ clay stabilizer (NH
4Cl) 2%+ corrosion inhibiter (ZX-01) 1%+ activating agent (SP-169) 1%+ water 84%
Claims (3)
1, a kind of agent for acidizing sandstone oil reservoir, it is characterized in that this system comprises inorganic acid, organic acid, ferrous stability, gelled acid, micella acid, cleanup additive, anti-breast-demulsifier, the HF stabilizing agent, clay stabilizer, water, its percentage by weight is inorganic acid 1-20%, organic acid 0.1-10%, ferrous stability 0.01%-5%, gelled acid 1-15%, micella acid 1-15%, cleanup additive 0.01-5%, anti-breast-demulsifier 0.01%-5%, stabilizing agent 0.01%-10%, clay stabilizer 0.01-10%, water 5-96.4%, the percentage by weight sum of each component is 100%.
2, a kind of acidizing sandstone oil reservoir system according to claim 1 is characterized in that described ferrous stability is that NTS, gelled acid are that PAC851, micella acid are that JS841, cleanup additive are SP-169, prevent that breast-demulsifier OP-10, clay stabilizer are NH
4Cl, stabilizing agent are NH
4HF.
3, a kind of acidizing sandstone oil reservoir system according to claim 1 is characterized in that described inorganic acid is HCl and HF, and organic acid is HAc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021317445A CN1483920A (en) | 2002-09-17 | 2002-09-17 | Agent for acidizing sandstone oil reservoir |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021317445A CN1483920A (en) | 2002-09-17 | 2002-09-17 | Agent for acidizing sandstone oil reservoir |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1483920A true CN1483920A (en) | 2004-03-24 |
Family
ID=34145013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA021317445A Pending CN1483920A (en) | 2002-09-17 | 2002-09-17 | Agent for acidizing sandstone oil reservoir |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1483920A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103333673A (en) * | 2013-07-12 | 2013-10-02 | 东北石油大学 | Deep low-damage acidizing fluid |
| CN103740353A (en) * | 2013-12-16 | 2014-04-23 | 中国石油化工股份有限公司 | Composite blocking remover and method for removing blockage of compact sandstone reservoir pressing crack commissioning horizontal well in composite manner |
| CN104295275A (en) * | 2013-07-17 | 2015-01-21 | 中国石油化工股份有限公司 | Deep blockage removal and injection increase method for water injection well of medium-and-high-permeability sandstone reservoir |
| CN105295886A (en) * | 2014-08-01 | 2016-02-03 | 中国石油天然气股份有限公司 | Composite retarded acid |
-
2002
- 2002-09-17 CN CNA021317445A patent/CN1483920A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103333673A (en) * | 2013-07-12 | 2013-10-02 | 东北石油大学 | Deep low-damage acidizing fluid |
| CN103333673B (en) * | 2013-07-12 | 2016-03-30 | 东北石油大学 | Deep low-damage acidizing fluid |
| CN104295275A (en) * | 2013-07-17 | 2015-01-21 | 中国石油化工股份有限公司 | Deep blockage removal and injection increase method for water injection well of medium-and-high-permeability sandstone reservoir |
| CN103740353A (en) * | 2013-12-16 | 2014-04-23 | 中国石油化工股份有限公司 | Composite blocking remover and method for removing blockage of compact sandstone reservoir pressing crack commissioning horizontal well in composite manner |
| CN103740353B (en) * | 2013-12-16 | 2016-02-03 | 中国石油化工股份有限公司 | A kind of composite blockage relieving agent and tight sandstone reservoir fracturing production horizontal well composite blockage relieving method |
| CN105295886A (en) * | 2014-08-01 | 2016-02-03 | 中国石油天然气股份有限公司 | Composite retarded acid |
| CN105295886B (en) * | 2014-08-01 | 2018-12-28 | 中国石油天然气股份有限公司 | A kind of composite retarded acid |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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