CN100494624C - Hydraulic fracturing process for generating multiple fractures - Google Patents
Hydraulic fracturing process for generating multiple fractures Download PDFInfo
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- CN100494624C CN100494624C CNB031343031A CN03134303A CN100494624C CN 100494624 C CN100494624 C CN 100494624C CN B031343031 A CNB031343031 A CN B031343031A CN 03134303 A CN03134303 A CN 03134303A CN 100494624 C CN100494624 C CN 100494624C
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Abstract
The invention relates to an oil well fracturing stimulation treatment, especially a technology for fracturing transforming low penetrative oil well for forming multi-slit, characterized in that : Stripping sand in fore step of the fracturing construction, Adding temporary blocking agent in a definite quantity, and implementing screening temporarily blocking. The temporarily blocking agent mainly comprises frame work agent, bonding agent, quality adjustment agent, and dissolving agent; Therein, frame work agent is 20%-25%, bonding agent is 20%-40%, quality adjustment agent is 20%-25%, and dissolving agent is 6%-10%. The frame work agent is paraffin. The bonding agent is resins. The quality adjustment agent is calcium carbonate. The technology can make more than one cracks, link with the stratum original micro-crack as much as possible, so the hydraulic fracturing is more filled by sand than the traditional ones.
Description
Affiliated technical field: the present invention relates to a kind of hydrofracturing of oil wells well stimulation, particularly the low permeability oil field fracturing is transformed and is formed many tailors technology.
Background technology: it is centrosymmetric wall scroll waterpower sand packed fracture that conventional fracturing technology can only form with well at the measure interval.In the LOW PERMEABILITY OILFIELD DEVELOPMENT process, although once attempting to use the fracturing process increases means such as hydraulic fracture operating pressure and causes multiple cracking at the measure interval, enlarging the oil well drainage area, but eventually because of hydraulic fracture is difficult to form the sand fallout bridge blinding, is difficult to form the hydraulic fracture hyperbaric environment, hydraulic fracture continues to extend at vertical and horizontal and fails.
Summary of the invention: the present invention seeks to transform for the oil field fracturing provides the many seams of a kind of generations fracturing technologies, it can form one or more hydraulic fracture, as much as possible link up ground layer original microcrack, than satisfy the more fracturing of back-up sand of conventional fracturing.
Technical scheme of the present invention is: the many seams of a kind of generation fracturing technology, and it is characterized in that: it realizes sand fallout earlier at the pressing crack construction leading portion; Add a certain amount of diverting agent; Realize shield-temporary plugging.
Described diverting agent mainly includes the compound substance of skeleton agent, adhesive, density adjuster, lytic agent; Wherein, the skeleton agent 20%-25%; Adhesive 20%-40%; Density adjuster 20%-25%; Lytic agent 6%-10%.
Described skeleton agent is a paraffin.Described adhesive is a resinae.Described density adjuster is a calcium carbonate.
Described lytic agent is a stearic acid.Described 23% paraffin, 25%-35% resin, 20%-25% calcium carbonate, 6%-10% stearic acid descend compound at 200 ℃-300 ℃, then be shaped to the granular substance of particle diameter 2-4mm at normal temperatures.Describedly add a certain amount of diverting agent, addition is chosen as 100Kg-900Kg.
The invention characteristics: the present invention it by fracturing fluid and fracturing parameter are optimized selection, in the stratum, at first form certain sand fallout environment, the control crack is in the continuation expansion of direction in length and breadth and extend; Utilize to add diverting agent formation shielding,, in the crack, form hyperbaric environment, produce a new crack again along with the rising of crack internal pressure; By the pressing crack construction parameter control, finally form one or more waterpower sand packed fracture.
The present invention makes the innovation of having carried out on the basis of seam aspect three in conventional fracturing.
1, the pressing crack construction leading portion is realized sand fallout
By analog study is carried out in oil reservoir characteristics, fracturing transformation scale, oil well production dynamic dispatching aspect, analyze crack system in the stratum; Determine the formation condition of sand fallout pressure break by optimal design, formulate construction sequence.
2, realize shield-temporary plugging after the sand fallout process
Temporary shielding method ,barrier building temporary seal incores is for the better extension in control crack, increases the ability of artificial control fracture pattern.Different phase in the fracturing construction according to the difference of construction requirement, selects the different time to add diverting agent, reaches the purpose that seam is made in control with this; In the crack, form hyperbaric environment,, in established crack, can produce a new crack again,, finally form two flow conductivity cracks by the pressing crack construction parameter control along with the rising of crack internal pressure.
3, novel diverting agent formula technique
Institute's invention diverting agent is the solid matter that the sticking pump of a kind of fracturing process, 35 ℃ of ground heatproofs, sealing characteristics are good, oil-soluble can be good.Its main component is skeleton agent, intensive, adhesive, density adjuster, lytic agent etc.Skeleton agent 30%-20%; Intensive 15%-20%; Adhesive 15%-25%; Density adjuster 20%-25%; Lytic agent 6%-10%.The skeleton agent is an inorganic salts; Described intensive is a chlorinated paraffin wax; Described adhesive is a resinae; Described density adjuster is NaCl; Described lytic agent is a stearic acid.
Main performance sees the following form:
| Title | Appearance color | Density g/cm 3 | Particle diameter mm | The molten index of oil | Ground heatproof ℃ |
| CQZ | Yellowish-brown | 1.54 | 2-4 | Under the status of criterion, kerosene 84h dissolves fully. | 35 |
| CQZ-A | Bottle green | 1.69 | 2-4 | Under the status of criterion, kerosene 50min dissolves fully. | 35 |
| CQZ-B | Kermesinus | 1.37 | 2-4 | Under the status of criterion, kerosene 30min dissolves fully. | 35 |
The present invention will be further described below in conjunction with the embodiment accompanying drawing.
Accompanying drawing 1 is No. 33 well refracturings of embodiment construction curve figure.
Accompanying drawing 2 is embodiment 36-192 well pressing crack construction curve maps.
The specific embodiment: be No. 33 well refracturings of embodiment construction curve figure as shown in Figure 1.Embodiment 33-33 well is that Ansai Oilfield Ping Qiao district is flatly through 12m
3Sand fracturing operation producing well, target zone is long 6 layers.This well location is in level ground 34-25---34-35 crack, level ground line side direction, effective thickness 18.6m, permeability 1.975 * 10
-3μ m2, degree of porosity 11.9%, water saturation 43.8%.Use this technology and carry out multiple fracturing reform quartz sand 10m
3+ diverting agent+quartz sand 8m
3Oil production level is original 2 times behind the refracturing, and a day produce oil is brought up to 2.73t/d by 1.34t/d.It realizes sand fallout earlier at the pressing crack construction leading portion during enforcement; The diverting agent that adds have its proportioning of 800Kg be have 25% paraffin, 40% resin, 25% calcium carbonate, 10% stearic acid 260 ℃ compound down, then be shaped to the granular substance of particle diameter 3mm at normal temperatures.
Embodiment 2, be Ansai Oilfield a bite producing well at the 36-192 well.On October 21st, 2002 implemented to add sand 20.0m to this well
3Conventional operation fracturing, formation fracture pressure 24.6MPa, operating pressure 17.02MPa, termination of pumping pressure 5.8MPa, operational discharge capacity 1.6m
3/ min, sand is than 34.9%.Day produce oil pumping day pumping discharge opeing output 0.5m to the well depth 1190m after the pressure break
3/ d.This well also is added with its proportioning of diverting agent 800Kg be 25% paraffin, 40% resin, 25% calcium carbonate, 10% stearic acid 260 ℃ compound down, then be shaped to the granular substance of particle diameter 3mm at normal temperatures.
By the geologic information analysis, think to have certain production capacity.For this reason, use this technology and carried out the repetition reforming test at the 36-192 well October 29.Strictness is constructed by designing requirement in the work progress, and pump pressure obviously rises (rising to 33MPa by 12MPa), and the obvious characteristic that has the crack to open again shows, sinks to adding sand 15.0m by design parameters subsequently
3, discharge capacity 1.6m
3/ min, operating pressure 18MPa, termination of pumping pressure 8.0MPa.The discharge opeing of closing well 30min open flow from the formation testing achievement, has obtained very promising result, pumping liquid level 850m, day production fluid 51m
3/ d, day produce oil 24t/d.
Claims (1)
1, the many seams of a kind of generation fracturing technology, it is characterized in that: it realizes sand fallout earlier at the pressing crack construction leading portion: its proportioning that adds 800Kg again is 25% paraffin, 40% resin, 25% calcium carbonate, 10% stearic acid, compound under 260 ℃, then be shaped to the diverting agent of the granular substance of particle diameter 3mm at normal temperatures; Realize shield-temporary plugging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031343031A CN100494624C (en) | 2003-06-18 | 2003-06-18 | Hydraulic fracturing process for generating multiple fractures |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031343031A CN100494624C (en) | 2003-06-18 | 2003-06-18 | Hydraulic fracturing process for generating multiple fractures |
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| Publication Number | Publication Date |
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| CN1566613A CN1566613A (en) | 2005-01-19 |
| CN100494624C true CN100494624C (en) | 2009-06-03 |
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| CNB031343031A Expired - Fee Related CN100494624C (en) | 2003-06-18 | 2003-06-18 | Hydraulic fracturing process for generating multiple fractures |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7380600B2 (en) * | 2004-09-01 | 2008-06-03 | Schlumberger Technology Corporation | Degradable material assisted diversion or isolation |
| CN101113669B (en) * | 2007-07-18 | 2011-09-07 | 中国石油集团川庆钻探工程有限公司 | Fracturing process for enhancing low permeability reservoir deliverability |
| CN101476452B (en) * | 2009-01-16 | 2012-05-09 | 庆阳长庆井下油田助剂有限责任公司 | Water-control fracturing yield increasing method for oil gas well |
| CN102134986B (en) * | 2011-04-29 | 2014-07-02 | 中国石油集团川庆钻探工程有限公司 | Production-increasing method by water-plugging and fracturing |
| CN102604627A (en) * | 2011-10-26 | 2012-07-25 | 中国石油化工股份有限公司 | Acid fracturing temporary plugging agent |
| CN103590804B (en) * | 2013-10-22 | 2016-02-10 | 中国石油天然气股份有限公司 | Thickened oil steam-stimulated well is stifled energization processing method temporarily |
| EP3201429B1 (en) * | 2014-10-03 | 2018-12-19 | Exxonmobil Upstream Research Company | Method for remediating a screen-out during well completion |
| CN107558980B (en) * | 2017-07-18 | 2020-05-08 | 中国石油天然气股份有限公司 | Low-density temporary plugging crack length-extension-restraining fracturing method |
| CN109679601A (en) * | 2017-10-19 | 2019-04-26 | 中国石油天然气股份有限公司 | A kind of diverting agent and its preparation method and application |
| CN114369450B (en) * | 2021-12-08 | 2022-12-27 | 延安祁北石油工程技术服务有限公司 | MCF fracturing temporary plugging agent and preparation method and application thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1041321C (en) * | 1991-02-11 | 1998-12-23 | 大庆石油管理局井下作业公司 | Temperarily blocking agent for water soluble stratum |
-
2003
- 2003-06-18 CN CNB031343031A patent/CN100494624C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1041321C (en) * | 1991-02-11 | 1998-12-23 | 大庆石油管理局井下作业公司 | Temperarily blocking agent for water soluble stratum |
Non-Patent Citations (4)
| Title |
|---|
| 堵老裂缝压新裂缝重复压裂技术. 胡永全等.西南石油学院学报，第22卷第3期. 2000 |
| 堵老裂缝压新裂缝重复压裂技术. 胡永全等.西南石油学院学报，第22卷第3期. 2000 * |
| 水力压裂技术的发展现状. 马新仿等.河南石油，第16卷第1期. 2002 |
| 水力压裂技术的发展现状. 马新仿等.河南石油，第16卷第1期. 2002 * |
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