CN103740353A - Composite blocking remover and method for removing blockage of compact sandstone reservoir pressing crack commissioning horizontal well in composite manner - Google Patents
Composite blocking remover and method for removing blockage of compact sandstone reservoir pressing crack commissioning horizontal well in composite manner Download PDFInfo
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- CN103740353A CN103740353A CN201310689357.0A CN201310689357A CN103740353A CN 103740353 A CN103740353 A CN 103740353A CN 201310689357 A CN201310689357 A CN 201310689357A CN 103740353 A CN103740353 A CN 103740353A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/528—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning inorganic depositions, e.g. sulfates or carbonates
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/524—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning organic depositions, e.g. paraffins or asphaltenes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing, limiting or eliminating the deposition of paraffins or like substances
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/32—Anticorrosion additives
Abstract
The invention discloses a composite blocking remover and a method for removing blockage of a compact sandstone reservoir pressing crack commissioning horizontal well in a composite manner. The composite blocking remover comprises a preposition liquid, a main treating fluid, an active blocking remover and a subsequent fluid. The preposition liquid is composed of organic acid, inorganic acid, a stabilizer, an oxidizing agent, a chelating agent, a corrosion inhibitor, polyol ether and water. The main treating fluid is composed of organic acid, inorganic acid, the stabilizer, the oxidizing agent, a fluorine carbon surfactant and water. The active blocking remover is composed of a zwitterionic surfactant, the stabilizer and water. The subsequent fluid is water. The composite blocking remover can remove the blockage of routine colloid, asphalt mass and inorganic solid phase particles, and can remove the damage of water blocking and crude oil emulsification by pertinency, and has the advantages of good slow performance, effectively preventing secondary deposition pollution such as the iron ion deposition and acid sludge generation, the horizontal well near-well and deep reservoir pollution can be effectively released, the oil well production power is recovered, and the recovery efficiency can be greatly increased.
Description
Technical field
The invention belongs to oilfield exploitation technical field, be specifically related to a kind of composite blockage relieving agent, also relate to a kind of tight sand oil reservoir fracturing production horizontal well composite blockage relieving method simultaneously.
Background technology
Sandstone Gas Reservoir has the feature that rate of permeation is low, pore throat is narrow and microfracture is grown, and in drilling process, drilling fluid is easily missed; The mode that adopts staged fracturing of horizontal well to go into operation, also certainly will have large quantity of fluid to enter stratum; In operation process, reservoir is very easily subject to the injury of the external fluid that is incompatible, and due to the impact of the factors such as temperature, pressure, easily causes wax, colloid, bituminous matter to deposit in immediate vicinity of wellbore simultaneously, forms organic obstruction; In working fluid, contain a large amount of inorganic or Organic Solid-Phase particles, these particles enter stratum, cause borehole or duct, stratum to stop up; Working fluid and resident fluid are incompatible, and make crude oil generation emulsification, have changed profit surface, interfacial tension, cause wettability reversal, and then cause water phase permeability to improve and permeability to oil reduction.These problems all can cause oil well productivity to decline or oil well water production rate increases, oil offtake reduces.In the face of these problems, single cleanup additive or unblocking agent only can solve colloid, bituminous matter is stopped up or inorganic solid particle in injected water, can not solve the other problemses such as water lock, emulsification, Assessment of Organic Pollution simultaneously, thereby can not meet the requirement of use.
Tight sand oil reservoir, because its reservoir properties is poor, adopts straight well exploitation to show the problems such as single well productivity is low, production rate decline is fast.Along with the progress of horizontal well drilling and fracturing technique, staged fracturing of horizontal well technology has become the important means of exploitation tight sand oil reservoir, but in operation process, a large amount of external liquid directly contact with reservoir and fracturing process in liquid channelling all can cause reservoir pollution, cause production capacity reduce.And reservoir is polluted the effective control measures of rear shortage.For example, the long 8 reservoir mean permeabilities 0.4 × 10 in oil field, Red River under the branch office of China Petrochemical Industry North China
-3μ m
2average pore 10.8%, for typical Sandstone Gas Reservoir, this oil field initial stage adopts straight well development mode, average individual well day, produce oil was lower than 1t, most of oil well belongs to low yield poor efficiency well, after 2010, adopt staged fracturing of horizontal well technology to develop, the horizontal well initial stage, an average day produce oil was greater than 8t, obtained good development effectiveness, but along with horizontal well scale development, occurred a collection of brill meet show good but after going into operation low yield poor efficiency and the condition of production good but pressed by offset well to alter the well that rear output sharply declines.A large amount of appearance of these wells have become one of principal contradiction of restriction horizontal well development tight sand oil reservoir.Therefore, seek a kind of construct simple, cheap, the suitable effective improvement method of expense, will directly have influence on the development effectiveness of tight sand reservoir horizontal well, for improving oil recovery, have great significance.
Summary of the invention
The object of this invention is to provide a kind of composite blockage relieving agent, solve existing single unblocking agent and can not meet the problem of service requirements.
Second object of the present invention is to provide a kind of tight sand oil reservoir fracturing production horizontal well composite blockage relieving method of using above-mentioned composite blockage relieving agent.
In order to realize above object, the technical solution adopted in the present invention is: a kind of composite blockage relieving agent, comprises pre-process liquid, main treatment solution, active blockages relieving fluid and subsequent fluid;
Described pre-process liquid is comprised of the component of following weight percent: organic acid 3.0%～5.0%, mineral acid 6.0%～10.0%, stablizer 2.0%～5.0%, oxygenant 0.01%～0.02%, sequestrant 0.5%～2.0%, inhibiter 0.8%～1.2%, polyol ethers 0.5%～2.0%, and surplus is water;
Described main treatment solution is comprised of the component of following weight percent: organic acid 1.0%～3.0%, mineral acid 3.0%～7.0%, stablizer 2.0%～3.0%, oxygenant 0.01%～0.02%, fluorocarbon surfactant 0.01%～0.08%, and surplus is water;
Described active blockages relieving fluid is comprised of the component of following weight percent: zwitterionics 1.0%～3.0%, stablizer 2.0%～3.0%, and surplus is water;
Described subsequent fluid is water;
Water in described pre-process liquid, main treatment solution, active blockages relieving fluid and the volume ratio of subsequent fluid are 35～50:80～90:110～120:20～30.
Described organic acid is acetic acid.
Described mineral acid is hydrochloric acid and hydrofluoric acid; In described pre-process liquid, the massfraction of hydrochloric acid is 3.0%～5.0%, and the massfraction of hydrofluoric acid is 3.0%～5.0%; In described main treatment solution, the massfraction of hydrochloric acid is 2.0%～5.0%, and the massfraction of hydrofluoric acid is 1.0%～2.0%.
Described stablizer is Repone K; Described oxygenant is ammonium persulphate.
Described fluorocarbon surfactant is both sexes fluorocarbon surfactant.
Described sequestrant is ethylenediamine tetraacetic acid (EDTA).
Described inhibiter is butynediol and alkylphenol polyoxyethylene; In described pre-process liquid, the massfraction of butynediol is 0.6%～1%, and the massfraction of described alkylphenol polyoxyethylene is 0.2%.
Described polyol ethers is propylene glycol monomethyl ether.
Described zwitterionics is empgen BB.
A tight sand oil reservoir fracturing production horizontal well composite blockage relieving method of using above-mentioned composite blockage relieving agent, comprises the following steps:
1) in well, propose flow string, be lowered to de-plugging operating tool string, dress well head;
2) adopt just crowded mode, successively pre-process liquid, main treatment solution, active blockages relieving fluid, subsequent fluid are clamp-oned in well;
3) after closing well reaction 12～48h, open head valve, bleed off pressure;
4) in well, trip out de-plugging operating tool string.
Composite blockage relieving agent of the present invention, comprises pre-process liquid, main treatment solution, active blockages relieving fluid and subsequent fluid, wherein:
Pre-process liquid is that organic acid, mineral acid, stablizer, oxygenant, sequestrant, inhibiter and polyol ethers are composite and use clear water to dilute the composite treating agent forming according to a certain percentage, can well remove organic and inorganic obstruction and fracturing fluid pollution near horizontal section pit shaft;
Main treatment solution is that organic acid, mineral acid, stablizer, oxygenant and tensio-active agent are composite and use clear water to dilute the composite treating agent forming according to a certain percentage, can well remove the inner organic and inorganic obstruction of reservoir, fracturing fluid pollution and the solution lock that dewaters; There is the fluorocarbon surfactant of ultralow surface and interface tension force, can well remove the milk sap that working fluid and crude oil form, remove the obstruction of organic deposition, reduce the row pressure power of returning, improve permeability to oil, recover oil well output;
Active blockages relieving fluid is that tensio-active agent and stablizer are composite and use clear water to dilute the composite treating agent forming according to a certain percentage, there is the zwitterionics of ultralow surface and interface tension force, can remove and prevent the milk sap that working fluid and crude oil form, prevented secondary pollution, effectively reduce the row pressure power of returning, improve permeability to oil, recovered oil well output;
Subsequent fluid is clear water, and the object of injecting clear water is to ensure that composite blockage relieving liquid fully enters oil reservoir deep, improves the validity of de-plugging.
Composite blockage relieving agent of the present invention, comprise pre-process liquid, main treatment solution, active blockages relieving fluid and subsequent fluid, not only can realize the releasing to conventional colloid, bituminous matter and inorganic solid particle in injected water, and solution lock, the emulsification of crude oil injury that dewaters targetedly, have advantages of that slow performance is good simultaneously, can effectively prevent the secondary sedimentation pollutions such as precipitation of iron ions and acid sludge generation, efficient solution is except the nearly well of horizontal well and deep reservoir pollution, greatly improve oil recovery factor, be suitable for the releasing of special LOW PERMEABILITY RESERVOIR staged fracturing operation horizontal well reservoir pollution.
Tight sand oil reservoir fracturing production horizontal well composite blockage relieving method of the present invention, consider tight sand oil reservoir fracturing production horizontal well drilling, pressure break, pressure is altered and reservoir temperature, the pollution that pressure change causes reservoir, optimization of C/C composites, pointed use comprises pre-process liquid, main treatment solution, the composite blockage relieving agent of active blockages relieving fluid and subsequent fluid, the mode that adopts segmentation to inject, remove nearly well reservoir and deep reservoir water lock, emulsification of crude oil, the inorganic solid particle in injected water on Assessment of Organic Pollution and stratum, in de-plugging process, effectively protect reservoir simultaneously, prevent secondary pollution, thereby realized efficiently releasing reservoir pollution, reduce horizontal well moisture, improve the object of per-well production, recover oil well productivity, the stable yields that the method is the tight sand oil reservoir that adopts the mode of staged fracturing of horizontal well and develop and improve recovery ratio strong technical guarantee is provided, technique is simple, easy to operate, is applicable to applying.
Embodiment
Below in conjunction with embodiment, the present invention is further illustrated.
Embodiment 1
The composite blockage relieving agent of the present embodiment, comprises pre-process liquid, main treatment solution, active blockages relieving fluid and subsequent fluid;
Described pre-process liquid is comprised of the component of following weight percent: acetic acid 3.0%, hydrochloric acid 3.0%, hydrofluoric acid 3.0%, Repone K 2.0%, ammonium persulphate 0.01%, ethylenediamine tetraacetic acid (EDTA) 0.5%, butynediol 0.6%, alkylphenol polyoxyethylene 0.2%, propylene glycol monomethyl ether 0.5%, and surplus is water; Water in pre-process liquid is 50m
3;
Described main treatment solution is comprised of the component of following weight percent: acetic acid 1.0%, hydrochloric acid 2.0%, hydrofluoric acid 1.0%, Repone K 2.0%, ammonium persulphate 0.01%, both sexes fluorocarbon surfactant 0.01%, and surplus is water; Water in main treatment solution is 90m
3;
Described active blockages relieving fluid is comprised of the component of following weight percent: empgen BB 1.0%, Repone K 2.0%, and surplus is water; Water in active blockages relieving fluid is 120m
3;
Described subsequent fluid is water, measures as 20m
3.
The tight sand oil reservoir fracturing production horizontal well composite blockage relieving method of the use composite blockage relieving agent of the present embodiment, comprises the following steps:
1) in well, flow string is proposed, be lowered to tieback to seal+
tieback oil pipe is to hanger position (1936.44m), and tieback is qualified, fills 350 type well heads,
annulus test between oil pipe and 7in sleeve pipe is to 5MPa, and it is qualified that pressure drop in 5 minutes is less than 0.5MPa; Connect surface pipeline, well head and surface pipeline pressure testing 25MPa, it is qualified that pressure drop in 15 minutes is less than 0.5MPa;
2) adopt just crowded mode, successively pre-process liquid, main treatment solution, active blockages relieving fluid, subsequent fluid are clamp-oned in well;
3) after closing well reaction 24h, slowly open head valve, bleed off pressure;
4) in well, trip out de-plugging operating tool string, lower flow string is produced.
Embodiment 2
The composite blockage relieving agent of the present embodiment, comprises pre-process liquid, main treatment solution, active blockages relieving fluid and subsequent fluid;
Described pre-process liquid is comprised of the component of following weight percent: acetic acid 5.0%, hydrochloric acid 5.0%, hydrofluoric acid 5.0%, Repone K 5.0%, ammonium persulphate 0.02%, ethylenediamine tetraacetic acid (EDTA) 2.0%, butynediol 1.0%, alkylphenol polyoxyethylene 0.2%, propylene glycol monomethyl ether 2.0%, and surplus is water; Water in pre-process liquid is 35m
3;
Described main treatment solution is comprised of the component of following weight percent: acetic acid 3.0%, hydrochloric acid 5.0%, hydrofluoric acid 2.0%, Repone K 3.0%, ammonium persulphate 0.02%, both sexes fluorocarbon surfactant 0.08%, and surplus is water; Water in main treatment solution is 80m
3;
Described active blockages relieving fluid is comprised of the component of following weight percent: empgen BB 3.0%, Repone K 3.0%, and surplus is water; Water in active blockages relieving fluid is 120m
3;
Described subsequent fluid is water, measures as 20m
3.
The tight sand oil reservoir fracturing production horizontal well composite blockage relieving method of the use composite blockage relieving agent of the present embodiment, comprises the following steps:
1) in well, flow string is proposed, be lowered to tieback to seal+
tieback oil pipe is to hanger position (1977.97m), and tieback is qualified, fills 350 type well heads,
annulus test between oil pipe and 7in sleeve pipe is to 5MPa, and it is qualified that pressure drop in 5 minutes is less than 0.5MPa; Connect surface pipeline, well head and surface pipeline pressure testing 25MPa, it is qualified that pressure drop in 15 minutes is less than 0.5MPa;
2) adopt just crowded mode, successively pre-process liquid, main treatment solution, active blockages relieving fluid, subsequent fluid are clamp-oned in well;
3) after closing well reaction 24h, slowly open head valve, bleed off pressure;
4) in well, trip out de-plugging operating tool string, lower flow string is produced.
Embodiment 3
The composite blockage relieving agent of the present embodiment, comprises pre-process liquid, main treatment solution, active blockages relieving fluid and subsequent fluid;
Described pre-process liquid is comprised of the component of following weight percent: acetic acid 4.0%, hydrochloric acid 4.0%, hydrofluoric acid 4.0%, Repone K 3.5%, ammonium persulphate 0.02%, ethylenediamine tetraacetic acid (EDTA) 1.2%, butynediol 0.8%, alkylphenol polyoxyethylene 0.2%, propylene glycol monomethyl ether 1.2%, and surplus is water; Water in pre-process liquid is 40m
3;
Described main treatment solution is comprised of the component of following weight percent: acetic acid 2.0%, hydrochloric acid 3.5%, hydrofluoric acid 1.5%, Repone K 2.5%, ammonium persulphate 0.01%, both sexes fluorocarbon surfactant 0.05%, and surplus is water; Water in main treatment solution is 85m
3;
Described active blockages relieving fluid is comprised of the component of following weight percent: empgen BB 1.5%, Repone K 2.5%, and surplus is water; Water in active blockages relieving fluid is 115m
3;
Described subsequent fluid is water, measures as 20m
3.
The tight sand oil reservoir fracturing production horizontal well composite blockage relieving method of the use composite blockage relieving agent of the present embodiment, comprises the following steps:
1) in well, flow string is proposed, be lowered to tieback to seal+
tieback oil pipe is to hanger position (1965.12m), and tieback is qualified, fills 350 type well heads,
annulus test between oil pipe and 7in sleeve pipe is to 5MPa, and it is qualified that pressure drop in 5 minutes is less than 0.5MPa; Connect surface pipeline, well head and surface pipeline pressure testing 25MPa, it is qualified that pressure drop in 15 minutes is less than 0.5MPa;
2) adopt just crowded mode, successively pre-process liquid, main treatment solution, active blockages relieving fluid, subsequent fluid are clamp-oned in well;
3) after closing well reaction 24h, slowly open head valve, bleed off pressure; 4) in well, trip out de-plugging operating tool string, lower flow string is produced.
Claims (10)
1. a composite blockage relieving agent, is characterized in that: comprise pre-process liquid, main treatment solution, active blockages relieving fluid and subsequent fluid;
Described pre-process liquid is comprised of the component of following weight percent: organic acid 3.0%～5.0%, mineral acid 6.0%～10.0%, stablizer 2.0%～5.0%, oxygenant 0.01%～0.02%, sequestrant 0.5%～2.0%, inhibiter 0.8%～1.2%, polyol ethers 0.5%～2.0%, and surplus is water;
Described main treatment solution is comprised of the component of following weight percent: organic acid 1.0%～3.0%, mineral acid 3.0%～7.0%, stablizer 2.0%～3.0%, oxygenant 0.01%～0.02%, fluorocarbon surfactant 0.01%～0.08%, and surplus is water;
Described active blockages relieving fluid is comprised of the component of following weight percent: zwitterionics 1.0%～3.0%, stablizer 2.0%～3.0%, and surplus is water;
Described subsequent fluid is water;
Water in described pre-process liquid, main treatment solution, active blockages relieving fluid and the volume ratio of subsequent fluid are 35～50:80～90:110～120:20～30.
2. composite blockage relieving agent according to claim 1, is characterized in that: described organic acid is acetic acid.
3. composite blockage relieving agent according to claim 1, is characterized in that: described mineral acid is hydrochloric acid and hydrofluoric acid; In described pre-process liquid, the massfraction of hydrochloric acid is 3.0%～5.0%, and the massfraction of hydrofluoric acid is 3.0%～5.0%; In described main treatment solution, the massfraction of hydrochloric acid is 2.0%～5.0%, and the massfraction of hydrofluoric acid is 1.0%～2.0%.
4. composite blockage relieving agent according to claim 1, is characterized in that: described stablizer is Repone K; Described oxygenant is ammonium persulphate.
5. composite blockage relieving agent according to claim 1, is characterized in that: described fluorocarbon surfactant is both sexes fluorocarbon surfactant.
6. composite blockage relieving agent according to claim 1, is characterized in that: described sequestrant is ethylenediamine tetraacetic acid (EDTA).
7. composite blockage relieving agent according to claim 1, is characterized in that: described inhibiter is butynediol and alkylphenol polyoxyethylene; In described pre-process liquid, the massfraction of butynediol is 0.6%～1.0%, and the massfraction of described alkylphenol polyoxyethylene is 0.2%.
8. composite blockage relieving agent according to claim 1, is characterized in that: described polyol ethers is propylene glycol monomethyl ether.
9. composite blockage relieving agent according to claim 1, is characterized in that: described zwitterionics is empgen BB.
10. a tight sand oil reservoir fracturing production horizontal well composite blockage relieving method of using composite blockage relieving agent as claimed in claim 1, is characterized in that: comprise the following steps:
1) in well, propose flow string, be lowered to de-plugging operating tool string, dress well head;
2) adopt just crowded mode, successively pre-process liquid, main treatment solution, active blockages relieving fluid, subsequent fluid are clamp-oned in well;
3) after closing well reaction 12～48h, open head valve, bleed off pressure;
4) in well, trip out de-plugging operating tool string.
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