CN1041321C - Temperarily blocking agent for water soluble stratum - Google Patents
Temperarily blocking agent for water soluble stratum Download PDFInfo
- Publication number
- CN1041321C CN1041321C CN 91101010 CN91101010A CN1041321C CN 1041321 C CN1041321 C CN 1041321C CN 91101010 CN91101010 CN 91101010 CN 91101010 A CN91101010 A CN 91101010A CN 1041321 C CN1041321 C CN 1041321C
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- China
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- water
- blocking agent
- gelatine
- stratum
- tannin extract
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Edible Oils And Fats (AREA)
- Medicinal Preparation (AREA)
- Cosmetics (AREA)
Abstract
The present invention relates to a temporary blocking agent for water soluble strata, which is used for stratum sections needing temporary blocking of a fractured well in an oil field. Bone glue, sesbania powders (or hydroxymethyl starch) and sulfonated asphalt (or sulfonated tannin extract) are proportioned, and the bone glue is added into water of 70 to 80 DEG C to make the bone glue thoroughly dissolved. After the temperature is decreased to 40 to 50 DEG C, sesbania powders are added to be uniformly stirred, and then, the sulfonated asphalt is added and is stirred intensely. After uniformly stirred, the mixture is spread to be dried and then is pulverized and sieved, and particles with sizes of 3 to 6mm are selected as the temporary blocking agent. The dosage of the temporary blocking agent can be reduced by more than 85%, and a special delivery tool is reduced, which is favorable for safety. The temporary blocking agent has a favorable effect and is favorable for production.
Description
The present invention relates to a kind of for improving field output, to oil and water well employed Temperarily blocking agent for water soluble stratum of temporarily blocking layer section in selecting pressure break and multiple cracking fracturing process.
Some technical finesses for improving oil production rate, will be taked to oil reservoir in the exploitation later stage in the oil field, as to the oil-water-layer pressure break etc., because formation heterogeneity causes difficulty to fracturing technology, take corresponding measure at concrete stratum.In the Technology of selective fracturing, high permeability formation is needed to adopt in advance the temporary plugging agent shutoff, so that low permeability formation is carried out pressure break, and to carry out blocking up temporarily to adding the intact pressure-break of sand in the multiple cracking fracturing process, so that press off the crack again.At present, the normal temporary plugging agent that uses is the thermosetting polymer of forming with compositions such as paraffin, high-pressure polyethylene, rosin and inorganic salt.Have seldom to be partially soluble in oil in their component, the overwhelming majority both had been insoluble to oil, and was also water insoluble.After pressure break finished, stifled temporarily stratum can only make it softening by ground temperature, loses the performance on shutoff stratum gradually, is discharged from the stratum at last, and not only consumption is many, and can't use on water injection well.Required input special tool volume is big, and general volume is 30～40 liters (L), and is withstand voltage under the high pressure of 60～70MPa, the instrument heaviness, and safety coefficient is low.
The objective of the invention is to overcome above-mentioned weak point of the prior art, and provide a kind of consumption can reduce more than 85%, solubleness reaches the temporary plugging agent more than 90% in moisture 50% above profit mixing solutions.The preparation method of this temporary plugging agent is provided simultaneously.
Purpose of the present invention can reach by the following technical programs: with water, and gelatine, sesbania powder or hydroxymethyl starch, sulfonated gilsonite or sulfonation tannin extract are pressed 6～8: 5～8: 2～3: 1～2 part by weight prescription, and its optimum weight ratio is 7: 6: 2.5: 1.5.
This temporary plugging agent is by water, gelatine, sesbania powder or hydroxymethyl starch, sulfonated gilsonite or sulfonation tannin extract are by 6～8: 5～8: 2～3: 1～2 anharmonic ratio is prepared from, and its preparation process is, earlier gelatine being joined in 70～80 ℃ of water fully dissolves it, after treating that temperature is reduced to 40～50 ℃, add sesbania powder or hydroxymethyl starch and stir, add sulfonated gilsonite thereafter again or sulfonation tannin extract brute force stirs, spread crushed after being dried out and sieve, select granularity 3-6mm.
The present invention compared with prior art has following effect: plugging effect is good, and every meter perforated zone reduces to 0.2kg by original 1.5kg, reduces more than 85% of consumption; Consumption reduces used special input instrument volume and also reduces, and helps safety, and after the shutoff pressure break, temporary plugging agent is fast by water-soluble speed, not only can be used but also can also be used for the technological transformation of well by oil well.
Below by example in detail the present invention:
Take by weighing the heating of 6～8kg water and remain to 70～80 ℃, add gelatine 6kg, stir while adding, gelatine is fully dissolved, after treating that temperature is reduced to 40～50 ℃, add sesbania powder or hydroxymethyl starch 2.5kg, stir while adding evenly, thereafter add sulfonated gilsonite or sulfonation tannin extract 1.5kg again, after under the brute force stirring component being mixed, be spread out on the iron plate that is coated with organic oil, thickness 2.5～3.5mm, after the seasoning, use the pulverizer grinding and sieving, select granularity 3～6mm as the finished product temporary plugging agent.
Consumption (perforated interval is used 0.2kg for every meter) by shutoff zone thickness decision temporary plugging agent.Wherein gelatine has bonding and sealing function, and sesbania powder or hydroxymethyl starch have thickening and improve intensity and regulate the effect of dissolution rate, and sulfonated gilsonite or sulfonation tannin extract have the effect that increases toughness and water-soluble speed.According to design, under high pressure temporary plugging agent together injects well with fracturing liquid, enter the higher permeability stratomere, fracturing liquid is by temporary plugging agent and leach filtrate, make the gelatine dissolving on temporarily stifled top layer, under the effect of pressure reduction, closely be associated in together, form fine and close filter cake, stop that fracturing liquid continues to enter the stratum, reaches the shutoff purpose.After pressure break finished, under the fracturing liquid effect of water and broken glueization, the sulfonated gilsonite in the temporary plugging agent was dissolved in water earlier, has increased water-soluble area, makes the sesbania powder then, and gelatine successively dissolves water discharges the stratum.
Claims (3)
1. one kind is the Temperarily blocking agent for water soluble stratum of solvent with water, and its prescription is characterised in that: with water, and gelatine, sesbania powder or hydroxymethyl starch, sulfonated gilsonite or sulfonation tannin extract are pressed 6～8: 5～8: 2～3: 1～2 part by weight prescription.
2, stratum as claimed in claim 1 temporary plugging agent is characterized in that: with water, and gelatine, sesbania powder or hydroxymethyl starch, sulfonated gilsonite or sulfonation tannin extract were in 7: 6: 2.5: 1.5 optimum weight ratios prescription.
3, a kind of method for preparing the Temperarily blocking agent for water soluble stratum of claim 1, it is characterized in that: this temporary plugging agent is by water, gelatine, sesbania powder or hydroxymethyl starch, sulfonated gilsonite or sulfonation tannin extract are by 6-8: 5～8: 2～3: 1～2 weight ratio is prepared from, its preparation process fully dissolves it for earlier gelatine being joined in 70～80 ℃ of water, after treating that temperature is reduced to 40～50 ℃, adding sesbania powder or hydroxymethyl starch stirs, thereafter add sulfonated gilsonite again or sulfonation tannin extract brute force stirs, spread crushed after being dried out and sieve, select granularity 3～6mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91101010 CN1041321C (en) | 1991-02-11 | 1991-02-11 | Temperarily blocking agent for water soluble stratum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91101010 CN1041321C (en) | 1991-02-11 | 1991-02-11 | Temperarily blocking agent for water soluble stratum |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1053631A CN1053631A (en) | 1991-08-07 |
| CN1041321C true CN1041321C (en) | 1998-12-23 |
Family
ID=4904922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91101010 Expired - Fee Related CN1041321C (en) | 1991-02-11 | 1991-02-11 | Temperarily blocking agent for water soluble stratum |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1041321C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100494624C (en) * | 2003-06-18 | 2009-06-03 | 长庆石油勘探局工程技术研究院 | Hydraulic fracturing process for generating multiple fractures |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1046988C (en) * | 1995-10-18 | 1999-12-01 | 辽河石油勘探局钻采工艺研究院 | Artificial well-wall sand-proof technology for steam-injection thermal-recovery well of viscous crude oil |
| US7380600B2 (en) * | 2004-09-01 | 2008-06-03 | Schlumberger Technology Corporation | Degradable material assisted diversion or isolation |
| CN1305965C (en) * | 2005-08-05 | 2007-03-21 | 倪红霞 | Cation asphalt anti-collapse agent emulsion and its producing method and using method |
| CN102020984B (en) * | 2009-09-15 | 2013-07-03 | 中国石油天然气股份有限公司 | Diversion fracturing temporary plugging agent in low-permeability oilfield joints and preparation method and application thereof |
| CN102040981B (en) * | 2010-11-30 | 2013-03-20 | 中国石油集团川庆钻探工程有限公司 | Water-based barite plugging agent with heat-sensitive characteristic |
| CN102010696B (en) * | 2010-11-30 | 2013-03-20 | 中国石油集团川庆钻探工程有限公司 | Water-based barite liquid plugging agent with heat-sensitive characteristic |
| CN102093864B (en) * | 2010-12-21 | 2013-07-10 | 中国石油天然气股份有限公司 | Temporary plugging diverting agent for repeated fracturing of oil-water well and preparation method thereof |
| CN103409121B (en) * | 2013-07-23 | 2016-02-10 | 中国石油天然气股份有限公司 | Water-soluble temporary plugging diversion agent for fracturing and preparation method thereof |
| CN106350043B (en) * | 2016-07-22 | 2019-04-12 | 北京斯迪莱铂油气技术有限公司 | Complex Temporary Blocking agent and Complex Temporary Blocking method for temporarily blocking up in turnaround fracture |
| CN107629774B (en) * | 2017-11-07 | 2019-01-04 | 成都劳恩普斯科技有限公司 | It is a kind of temporarily to block up diversion agent and preparation method thereof |
| CN110205106B (en) * | 2019-05-27 | 2021-03-26 | 吉林省安和石油技术服务有限公司 | Plugging and isolating agent for low-pressure natural gas well of oil field and preparation method of plugging and isolating agent |
| CN116515469A (en) * | 2023-05-11 | 2023-08-01 | 四川川庆井下科技有限公司 | Water-soluble temporary plugging agent for fracturing and synthesis method thereof |
-
1991
- 1991-02-11 CN CN 91101010 patent/CN1041321C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100494624C (en) * | 2003-06-18 | 2009-06-03 | 长庆石油勘探局工程技术研究院 | Hydraulic fracturing process for generating multiple fractures |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1053631A (en) | 1991-08-07 |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |