CN113638725B - Acid fracturing method for broken solution reservoir - Google Patents

Acid fracturing method for broken solution reservoir Download PDF

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Publication number
CN113638725B
CN113638725B CN202010344396.7A CN202010344396A CN113638725B CN 113638725 B CN113638725 B CN 113638725B CN 202010344396 A CN202010344396 A CN 202010344396A CN 113638725 B CN113638725 B CN 113638725B
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fracture
fracturing
stage
acid
reservoir
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CN113638725A (en
Inventor
赵海洋
张�雄
赵兵
黄燕飞
李春月
房好青
罗攀登
耿宇迪
刘志远
纪成
宋志峰
何晓波
陈定斌
刘雄波
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China Petroleum and Chemical Corp
Sinopec Northwest Oil Field Co
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China Petroleum and Chemical Corp
Sinopec Northwest Oil Field Co
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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
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25—Methods for stimulating production
    • E21B43/26—Methods for stimulating production by forming crevices or fractures
    • 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
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/62—Compositions for forming crevices or fractures
    • C09K8/66—Compositions based on water or polar solvents
    • C09K8/68—Compositions based on water or polar solvents containing organic compounds
    • C09K8/685—Compositions based on water or polar solvents containing organic compounds containing cross-linking agents
    • 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
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/62—Compositions for forming crevices or fractures
    • C09K8/72—Eroding chemicals, e.g. acids
    • C09K8/74—Eroding chemicals, e.g. acids combined with additives added for specific purposes
    • 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
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/84—Compositions based on water or polar solvents
    • C09K8/86—Compositions based on water or polar solvents containing organic compounds
    • C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
    • C09K8/887—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
    • 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
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/84—Compositions based on water or polar solvents
    • C09K8/86—Compositions based on water or polar solvents containing organic compounds
    • C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
    • C09K8/90—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
    • C09K8/905—Biopolymers
    • 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
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25—Methods for stimulating production
    • E21B43/26—Methods for stimulating production by forming crevices or fractures
    • E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
    • 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
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/28—Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent
    • E21B43/283—Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent in association with a fracturing process
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/10—Geothermal energy

Abstract

The invention provides an acid fracturing method for a dissolved reservoir, which comprises a perforating step, wherein perforating operation is carried out to form perforations in a target reservoir; and forming an artificial fracture, namely performing fracturing operation on the basis of perforation to form an artificial fracture in the target reservoir so as to communicate with an oil-gas reservoir body in the target wellbore region, wherein in the step of forming the artificial fracture, multiple fracturing operations can be performed, at least one subsequent fracturing operation can enable the lower fracture height of the fracture to extend downwards relative to the previous fracturing operation, and the acid fracturing method can control the fracture height, particularly prevent the upper fracture height from expanding, ensure the lower fracture height to expand, enable the fracture to be better communicated with the reservoir, obtain the most advantageous channel and further improve the production capacity.

Description

Acid fracturing method for broken solution reservoir
Technical Field
The invention relates to the technical field of oil and gas exploitation, in particular to an acid fracturing method for a broken solution reservoir.
Background
With the development of oil gas development, the field of ultra-deep carbonate rock obtains important oil gas breakthrough. The oil and gas reservoirs are considered to be the disconnected solution oil and gas reservoirs by comprehensively analyzing the structural evolution, the reservoir, the oil and gas reservoir characteristics, the oil and gas enrichment rules and the like of some oil and gas fields, and have the characteristics of integral oil content and nonuniform enrichment along a fracture zone. The broken solution is not only an oil gas migration channel but also an oil gas enrichment place.
In general, the carbonate reservoir has the characteristics of natural crack development and strong brittleness, and the longitudinal stress difference of the reservoir is small, and the vertical crack height is difficult to control. When the drill bit drills to the disconnected solution reservoir, the heterogeneity is strong, the drilling risk is high, and the well bottom is generally positioned at the upper part of the disconnected solution reservoir. If the acid fracturing is directly carried out on the reservoir, the upper seam height is easily expanded to a non-producing layer, and the effective yield increase cannot be obtained.
Therefore, the invention discloses a fracturing method for breaking a solution to effectively increase the yield, which is a technical problem to be solved urgently.
Disclosure of Invention
Aiming at part or all of the technical problems in the prior art, the invention provides an acid fracturing method for a broken solution. The acid fracturing method can control the seam height, particularly avoid the expansion of the upper seam height, ensure the expansion of the lower seam height, ensure that the cracks are better communicated with the reservoir, obtain the most advantageous channel and further improve the production capacity.
In order to achieve the above object, the present invention provides an acid fracturing method for a broken solution, comprising:
a perforating step of performing a perforating operation to form perforations in the target reservoir,
a step of forming an artificial fracture, wherein a fracturing operation is performed on the basis of perforation to form an artificial fracture in the target reservoir so as to communicate with the hydrocarbon reservoir body in the target wellbore region,
wherein in the step of forming the artificial fracture, a plurality of fracturing operations may be performed, and at least one subsequent fracturing operation may be capable of extending a lower fracture height of the fracture downward relative to a previous fracturing operation.
In one embodiment, in the step of forming the artificial fracture,
in a first stage, a fracturing operation is performed to form an initial fracture,
a second stage of injecting slick water carrying the floating agent into the stratum to form an upper partition plate on the upper wall surface of the initial crack,
and in the third stage, carrying out fracturing operation on the basis of the initial fracture so as to enable the lower fracture height of the initial fracture to extend downwards until the fracture length of the fracture reaches a preset value.
In one embodiment, in the step of forming the artificial fracture further comprises,
a fourth stage of injecting slick water carrying temporary plugging agent into the stratum to temporarily plug the front end of the crack,
and fifthly, carrying out fracturing operation, and enabling the lower seam height of the crack to extend downwards further under the action of the upper partition plate and the temporary plugging agent positioned at the front end of the crack.
In one embodiment, the step of creating an artificial fracture further includes a sixth stage of pumping a cross-linking acid system into the formation to acid etch the walls of the fracture to increase the conductivity of the fracture.
In one embodiment, during the fracturing operation of the first stage, no less than 6.5m 3 The displacement of/min pumps the fracturing fluid.
In one embodiment, in the second stage, the floating agent is glass beads or a temporary plugging agent which can float relative to the drilling fluid and bear the formation pressure, and the pumping displacement in the injection process is preferably not less than 3.0m 3 /min。
In one embodiment, in the third stage, not less than 6.5m 3 The displacement of/min pumps the fracturing fluid.
In one embodiment, in the fourth stage, the number of the holes is not less than 6m 3 The displacement pump pumps the slickwater per minute, wherein the mass concentration of the temporary plugging agent in the slickwater is 2.5-3.5%.
In one embodiment, the fracturing fluid comprises, in weight percent, 0.5% guanidine gum, 0.02% pH adjustor, 1.0% demulsifier, 0.5% temperature stabilizer, and 0.6% organoboron crosslinker during a fracturing operation.
In one embodiment, the cross-linking acid system comprises, in weight percent, 20% hcl, 0.7% thickener, 1.0% corrosion inhibitor, 1.0% iron stabilizer, 1.0% demulsifier, 2.0% cross-linker, and 0.03% breaker.
Compared with the prior art, the invention has the advantages that: according to the acid fracturing method, the lower seam height of the crack can be extended downwards through multiple fracturing operations, the upper seam height is prevented from being extended, so that the crack is better communicated with the reservoir, the most advantageous channel is obtained, and the production capacity is improved.
Drawings
Preferred embodiments of the present invention will be described in detail below with reference to the attached drawing figures, wherein:
fig. 1 shows an effect diagram of the acid fracturing method according to the present invention.
The figures are not drawn to scale.
Detailed Description
In order to make the technical solution and advantages of the present invention more apparent, exemplary embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. It will be apparent that the described embodiments are only some of the embodiments of the present invention and are not exhaustive of all embodiments. And embodiments of the invention and features of the embodiments may be combined with each other without conflict.
The invention establishes a fracturing method capable of controlling fracture height aiming at a method for communicating a reservoir layer with a high drilling risk of a broken solution reservoir layer and a well bottom positioned at the upper part of the broken solution reservoir layer. The method is suitable for the broken solution, but is not limited to the broken solution, and can be applied to any fracturing construction needing to control the fracture height. Embodiments of the method provide an acid fracturing method for a solution breaking. As shown in fig. 1, the acid fracturing method is preceded by a perforating operation (at position 05 in fig. 1) upon completion of the well. That is, after drilling is completed, the perforating device is lowered into the wellbore and perforating operations are performed as designed to form perforations in the target reservoir. Then, based on the perforations, a fracturing operation is performed to form artificial fractures in the target reservoir to communicate with the hydrocarbon reservoir in the target wellbore region. According to the acid fracturing method, fracturing is performed in a plurality of times, wherein one or more subsequent fracturing operations can control downward extension and expansion of the lower fracture height of the fracture relative to the previous fracturing operation. That is, at least one fracturing operation can be performed relative to a previously performed fracturing operation, such that the lower fracture height of the fracture extends further downward. For example, the lower fracture height of the fracture extends relatively downward during the second fracturing operation based on the first fracturing operation.
Specifically, in the step of forming the artificial fracture, a fracturing operation is performed first to form an initial fracture (indicated by a drawing numeral 08 in fig. 1, in which the lower fracture high bottom of the initial fracture is indicated by a drawing numeral 09). As the fracturing fluid is pumped into the formation, the fracturing fluid presses open the formation from the pre-perforation to form an initial fracture. The fracturing fluid which can be used in this stage comprises 0.5% of guanidine gum, 0.02% of pH regulator, 1.0% of demulsifier, 0.5% of temperature stabilizer and 0.6% of organoboron crosslinking agent by mass. Pressing under pressureIn the cracking process, not less than 6.5m can be used 3 Displacement pumping per min. It should be noted that the pumping temperature is required to be higher than 0 ℃, and if the pumping temperature is lower than the pumping temperature, an antifreezing measure is required.
And injecting slick water into the stratum, wherein the slick water carries the floating agent into the stratum. After the pumping is stopped for a period of time, the upward floating agent floats to the upper wall surface of the initial fracture to form an upper baffle (the upward floating agent is represented by a drawing number 06 in fig. 1). Slick water can be deployed in the field with 0.3% guanidine gum by mass, 0.02% pH adjuster, and the remainder clear water. And, the floating agent is glass beads or liquid plugging agent with low density capable of floating and bearing formation pressure. The concentration of the floating agent injected into the slickwater may be about 3-5%. In the injection process, the displacement of the pumping slick water is more than or equal to 3m 3 And/min, and stopping pumping for 20 minutes.
The fracturing fluid is pumped again at high displacement, and the formation is fractured again on the basis of the initial fracture. Since the last construction forms the upper partition plate on the upper wall surface of the crack, when the fracturing fluid is pumped this time, the length of the crack is increased while the height of the lower crack of the fracturing fluid is extended downwards (the extended crack is shown by a graph number 10 in fig. 1). The fracturing fluid in the stage can be the same as the pumping fracturing fluid in the preamble, so that the operations such as proportioning and the like of the fracturing fluid are simplified. However, the pumping capacity of the fracturing fluid at this stage cannot be small relative to the pumping capacity of the fracturing fluid at the first stage, such as greater than 6.5m 3 The ratio of the total fraction to the total fraction is 7m 3 And/min to allow the fracturing fluid to better propagate deep into the formation to allow the fracture length to reach a predetermined value (the predetermined value is determined by simulation calculations after geological exploration is completed). Preferably, at this stage, the fracturing fluid may incorporate an upward buoyancy agent to increase the resistance of the upper barrier and form the upper barrier at the new fracture, thereby actuating the downward extension of the fracturing fluid. The injection concentration of the floating agent in the fracturing fluid is 2-3%, and the pumping discharge capacity is more than or equal to 6.5m 3 /min, at the last 80-100m 3 The fracturing fluid is not added with an upward floating agent, the specific value is determined according to 1.5 times of the volume of the tubular column, and the pump stopping time is 20 minutes.
Injecting temporary plugging agent into stratumIs slick water. The slickwater carries the temporary plugging agent into the stratum, so that the temporary plugging agent reaches the tail part of the crack, and the temporary plugging effect of the tail part of the crack is achieved. The temporary plugging agent is a plugging agent which can be carried to the far end of a crack and has plugging strength of more than 10MPa, and comprises 90 mass percent of polyester, 5 mass percent of surfactant and 5 mass percent of degradation agent. While the same slick water as in the previous paragraph may be used. The injection concentration of temporary plugging agent in slick water is selected to be more than or equal to 3%, and the pumping discharge is controlled to be not less than 6m 3 /min。。
By the above construction, the length of the slit has reached the desired length, and the upper separator is formed on the upper wall surface of the slit. At this time. And pumping the fracturing fluid again, and under the action of the upper partition plate and the temporary plugging agent, enabling the lower seam height of the fracture to extend downwards so as to fracture the reservoir to a greater extent. Wherein the construction pressure of the fracturing fluid is controlled to be about 120MPa, and the discharge capacity is more than or equal to 8m 3 /min, e.g. 12m 3 /min。
After the whole fracture meets the requirements, a cross-linking acid system with slow reaction, small fluid loss and strong penetration distance is injected into the stratum, and the wall surface of the fracture is subjected to acid etching, so that the influence of the floating agent and the temporary plugging agent on the fracture is eliminated or reduced, and the diversion capacity of the fracture is improved. Preferably, the cross-linking acid system formulation comprises: 20% of HCl, 0.7% of thickening agent, 1.0% of corrosion inhibitor, 1.0% of iron ion stabilizer, 1.0% of demulsifier, 2.0% of cross-linking agent and 0.03% of gel breaker, wherein the specific gravity is mass percent. The construction pressure of the cross-linking acid is less than or equal to 120MPa, and the discharge capacity reaches 10m 3 And/or more than min.
And injecting slick water into the stratum, and extruding residual acid liquid in the shaft into the stratum so as to fully utilize the acid liquid.
And finally, stopping the pump and closing the well for about 30 minutes, measuring the pressure drop, ensuring that the acid liquor and the stratum react completely, and reflecting the communication condition between the fracturing and the deep part of the stratum through the pressure drop measurement.
In addition, for ease of understanding, the names of the remaining components in fig. 1 are described, specifically, in fig. 1, the drawing number 01 indicates an oil pipe, 02 indicates a casing, 03 indicates a packer, 04 indicates a tail pipe, 05 indicates a perforating position, 07 indicates an open hole section, and 11 indicates a formation.
The method aims at the transformation problem of the disconnected solution reservoir with wide oil gas distribution but poor communication in the longitudinal direction of the ultra-deep reservoir, the acid fracturing method is adopted, the effect of expanding the acid fracturing large seam height is achieved, the disconnected solution reservoir is effectively dredged, and the effective yield increase is obtained.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all alterations and/or modifications that fall within the scope of the invention, and that are intended to be included within the scope of the invention.

Claims (8)

1. An acid fracturing method for a solution reservoir, comprising:
a perforating step of performing a perforating operation to form perforations in the target reservoir,
a step of forming an artificial fracture, wherein a fracturing operation is performed on the basis of perforation to form an artificial fracture in the target reservoir so as to communicate with the hydrocarbon reservoir body in the target wellbore region,
wherein in the step of forming the artificial fracture, a plurality of fracturing operations may be performed, and at least one subsequent fracturing operation may extend the lower fracture height of the fracture downward relative to the previous fracturing operation,
in the step of forming the artificial crack(s),
in a first stage, a fracturing operation is performed to form an initial fracture,
a second stage of injecting slick water carrying the floating agent into the stratum to form an upper partition plate on the upper wall surface of the initial crack,
in the third stage, the fracturing operation is carried out on the basis of the initial fracture so as to lead the lower fracture height of the initial fracture to extend downwards until the fracture length of the fracture reaches a preset value,
a fourth stage of injecting slick water carrying temporary plugging agent into the stratum to temporarily plug the front end of the crack,
in the fifth stage, the fracturing operation is carried out, under the action of the upper partition plate and the temporary plugging agent positioned at the front end of the fracture, the lower fracture height of the fracture is further extended downwards,
and a sixth stage, pumping a cross-linking acid system into the stratum so as to carry out acid etching on the wall surface of the fracture and increase the diversion capacity of the fracture.
2. The acid fracturing method of claim 1, wherein during the fracturing operation of the first stage, at least 6.5m 3 The displacement of/min pumps the fracturing fluid.
3. An acid fracturing method according to claim 1 or 2, wherein in the second stage the uplift agent is glass beads or a liquid temporary plugging agent which are floatable relative to the drilling fluid and which are capable of withstanding the formation pressure.
4. A method according to claim 3, wherein in the second stage, the pumping capacity during injection is not less than 3.0m 3 /min。
5. The acid fracturing method according to claim 1 or 2, characterized in that in the third stage, it is carried out in a volume of not less than 6.5m 3 The displacement of/min pumps the fracturing fluid.
6. The acid fracturing method according to claim 1 or 2, characterized in that in the fourth stage, it is carried out in a state of not less than 6m 3 The displacement pump pumps the slickwater per minute, wherein the mass concentration of the temporary plugging agent in the slickwater is 2.5-3.5%.
7. The acid fracturing method of claim 1 or 2, wherein the fracturing fluid comprises, in weight percent, 0.5% guanidine gum, 0.02% ph adjuster, 1.0% demulsifier, 0.5% temperature stabilizer, and 0.6% organoboron crosslinker during the fracturing operation.
8. The acid fracturing method of claim 1 or 2, wherein the cross-linking acid system comprises, in weight percent, 20% hcl, 0.7% thickener, 1.0% corrosion inhibitor, 1.0% iron ion stabilizer, 1.0% demulsifier, 2.0% cross-linking agent, and 0.03% breaker.
CN202010344396.7A 2020-04-27 2020-04-27 Acid fracturing method for broken solution reservoir Active CN113638725B (en)

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CN112410001B (en) * 2020-11-05 2023-05-26 中国石油天然气股份有限公司大港油田分公司 Floating agent and high-strength floating agent partition plate process for controlling fracturing fracture perforating expansion

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CN105041288A (en) * 2015-07-13 2015-11-11 中国石油大学(北京) Fractural diverting acid-fracturing method for carbonate oil-gas reservoirs
CN104963672B (en) * 2015-07-13 2016-09-21 中国石油大学(北京) A kind of diverting material that cleans blocks up the reservoir reconstruction method of borehole formation seam net temporarily
CN108240210A (en) * 2016-12-27 2018-07-03 中国石油天然气股份有限公司 A kind of refracturing method
CN108756841B (en) * 2018-04-18 2020-03-24 中国科学院武汉岩土力学研究所 Shale repeated fracturing treatment method
CN110656920B (en) * 2018-06-28 2022-02-18 中国石油化工股份有限公司 Acid fracturing method for complex fractures in carbonate reservoir
CN110244079B (en) * 2019-07-18 2019-12-20 西南石油大学 Testing method for floating rate of seam-control high-floating agent

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