CN113914844A - Effective transformation method for marlite matrix type reservoir - Google Patents
Effective transformation method for marlite matrix type reservoir Download PDFInfo
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- 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
- E21B43/27—Methods for stimulating production by forming crevices or fractures by use of eroding chemicals, e.g. acids
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- 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
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Abstract
The invention discloses an effective reconstruction method for a marlite matrix type reservoir, which comprises the following steps: carrying out geological feature analysis of a marlite reservoir, and carrying out systematic recognition on rock mineral components, distribution, structural features, development conditions of bedding joints, rock mechanical parameters and ground stress; establishing a fracture expansion object model and a digital model under complex lithology, and analyzing the influence of different lithology distribution on the fracture expansion form; by analyzing the content of the sensitive minerals, the static and dynamic damage evaluation work of working fluids such as acid liquor, fracturing fluid and the like on the sensitive mineral-containing rock core under different process technologies is developed, and a low-damage working fluid system suitable for complex lithology is preferably selected; according to the dynamic expansion morphological research of the cracks under the complex lithology and the evaluation of the matched low-damage working fluid, and the condition of the shaft, a set of effective transformation method aiming at the marlite matrix type reservoir is finally formed. The method can realize effective utilization of the marlite matrix type reservoir, and improve the fracturing quality and the gas testing effect.
Description
Technical Field
The invention relates to the technical field of novel shale gas exploration, in particular to an effective reconstruction method for a marlite matrix type reservoir.
Background
The marlite reservoir as a new type of shale gas has the characteristics of good gas content, shallow burial and rich natural gas resource amount, and is one of the successive layers of important shale gas resources. The marlite reservoir is mainly divided into a crack type and a matrix type, and measures are required to be modified for realizing exploration breakthrough and obtaining stable industrial airflow. The fractured reservoir has a high yield effect by adopting acid fracturing, conventional process tests such as multiple times of acidification, acid fracturing, fracturing and the like are developed in the early stage of the matrix reservoir, but no stable yield breakthrough is obtained, the analysis is mainly influenced by adverse conditions such as complex lithology (mainly carbonate rock and secondarily other siliceous minerals), sensitive mineral (talc component of softest mineral), longitudinal and plane heterogeneity and the like, the reconstruction of measures of the marl reservoir has the problems of unclear fracture initiation and expansion form, unclear damage mechanism of complex lithology and action characteristics of well-entering liquid and unclear dominant process technology of the complex lithology, and a dominant process technology suitable for the benefit development of the Fuling couchtoma group is not formed.
Aiming at the problem, the invention finally determines a key modification technology suitable for the marlite matrix type reservoir through analyzing and researching the crack extension form under the complex lithology and selecting the matched working fluid according to the characteristics of sensitive minerals, thereby providing technical support for continuous stable production and ensuring the resource implementation of the marlite matrix type reservoir.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an effective reconstruction method for a marlite matrix type reservoir, which can realize the maximum utilization of the reservoir and improve the fracturing quality and the gas testing effect aiming at the defects in the prior art.
The technical scheme adopted by the invention is as follows: an effective reconstruction method for a marlite matrix type reservoir, characterized in that: the method comprises the following steps:
s1 reservoir geological feature analysis
Carrying out geological feature analysis of a marlite reservoir, systematically knowing rock mineral components and distribution, structural features, development conditions of bedding joints, rock mechanical parameters and ground stress, and providing corresponding basic parameters for later theoretical research and evaluation;
s2 research on fracture initiation and dynamic expansion under complex lithology
And establishing a fracture expansion object model and a fracture expansion digital model under complex lithology. Evaluating the crack conductivity contrast condition of the marl under the conventional acidizing, acid fracturing, sand fracturing and acid fracturing composite processes through conventional liquid etching and conductivity experiments; setting parameters such as marlite lithology, temperature and pressure gradient, performance of a measure liquid, construction scale, size of a matched tubular column and the like into a program by using GOFER fracturing professional software, and influencing crack expansion forms under different process technologies;
s3, analyzing damage evaluation of working fluid to sensitive minerals
By analyzing the content of the sensitive minerals, the static soaking, acid liquor corrosion and dynamic gas infiltration flowing damage evaluation work of the working fluid on the rock core containing the sensitive minerals under different process technologies is carried out, and a low-damage working fluid system suitable for complex lithology is preferably selected;
s4 research on key process technology
According to the dynamic expansion morphological research of the cracks under the complex lithology and the evaluation of the matched low-damage working fluid, a set of construction process aiming at the marlite matrix type reservoir is finally formed by combining the conditions of the shaft.
According to the technical scheme, in the step S1, the characteristic of the reservoir lithology of the marl is analyzed by mainly using the marl with the hole in the marl, and the key reconstruction object is determined through a water immersion test.
According to the technical scheme, in the step S1, mechanical characteristics of the marlite reservoir are analyzed through a rock mechanical test and a full-automatic triaxial pressurizing and measuring system matched with servo control and by combining stress-strain characteristics.
According to the technical scheme, in the step S1, when the integral strain condition of the marlite reservoir is analyzed, main logging data of reservoir rock density, sound waves, well diameter and well deviation are recorded into Intech shale stress software, the horizontal stress difference and the longitudinal stress change condition are calculated in a simulation mode, and when the two-direction horizontal stress difference, the stress difference coefficient and the maximum difference of the longitudinal small layer stress meet the design values, the integral reservoir transformation is facilitated.
According to the technical scheme, in the step S2, the fracture conductivity of the marlite under the conventional acidizing, acid fracturing, sand fracturing and a 'sand fracturing and acid fracturing' composite process is simulated through a liquid etching and conductivity experiment.
According to the technical scheme, in the step S2, by inputting the parameters of marlite lithology, temperature and pressure gradient, measure liquid performance, construction scale, matched pipe column size and the like, GOFER fracturing professional software is used for simulating the fracture expansion rule under the conventional acidizing, acid fracturing, sand fracturing and acid fracturing composite processes under the complex lithology.
According to the technical scheme, in the step S3, a static soaking damage evaluation test is carried out, and the change condition of the surface of the core is observed through soaking the core in clear water; further observing the change condition analysis of the surfaces of the soaked rock cores of different acid liquid systems through scanning of an electron microscope; and carrying out acid liquor corrosion and dynamic gas permeability dynamic damage tests, and comparing the change conditions of the permeability of the rock core before and after injection of different acid liquor systems.
According to the technical scheme, in the step S3, in the acid solution corrosion and dynamic gas permeation dynamic damage test, the corrosion rate of a 20% hydrochloric acid system is the highest, and the test is carried out by adding different components into the 20% hydrochloric acid to form different acid solution systems.
According to the technical scheme, in the step S4, aiming at a matrix reservoir with undeveloped cracks, the influences of factors such as marlite lithology and high talc content are considered, indoor crack extension research and sensitivity evaluation conditions are combined, the reservoir has strong sensitivity and conditions for forming complex cracks, and a main body transformation process is determined by aiming at expanding crack volume, etching and improving flow conductivity, improving transformation strength and strengthening reservoir protection.
According to the technical scheme, in the step S4, the modification method comprises the following steps:
(1) in order to improve the transformation effect, three factors, namely lithologic change, physical property difference and crack development, are considered in an important way based on the heterogeneity of a reservoir, dessert types are divided, and the horizontal section is finely segmented; meanwhile, in order to reduce influence factors in the sections, ensure uniform crack initiation and crack length extension of each cluster in a single section, design perforation in a differentiation manner, increase manual crack distribution density by adopting close cutting perforation and realize high-strength volume of a horizontal section;
(2) in order to increase the transformation volume, the design of the seam promoting length and the volume protection is as follows: a large-displacement and multi-cluster perforation and drag reduction water carrying proppant process is adopted;
(3) in order to ensure a seepage channel, the flow conductivity is designed to be enhanced: and a clean acid system is adopted for etching, so that the length and the flow conductivity of an acid etching crack are enhanced.
The beneficial effects obtained by the invention are as follows: the invention can realize effective reconstruction of the marlite matrix type reservoir, and a targeted process technology is formulated by clearly mastering the fracture initiation and expansion forms; understanding the influence of sensitive minerals on the transformation effect, preferably selecting matched low-damage working fluid, reducing secondary damage, avoiding ineffective transformation, determining the key process technology of the marlite matrix type reservoir, and providing technical support for realizing novel shale gas resource reservoir, thereby realizing the maximum utilization of the reservoir, and improving the fracturing quality and the gas testing effect.
Drawings
Fig. 1 is a schematic diagram of the mineral composition of a marlite reservoir provided by an embodiment of the invention.
Fig. 2 is a cross-sectional view of "eyelid" and "eyeball" rocks in a marlite reservoir according to an embodiment of the present invention.
Fig. 3 is a stress-strain characteristic curve diagram of a marlite reservoir provided by an embodiment of the invention.
Fig. 4 is a longitudinal stress profile of a marlite reservoir provided by an embodiment of the invention.
Fig. 5 is a schematic view of a conductivity test of complex lithology under different processes according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of fracture propagation morphology under complex lithology according to an embodiment of the present invention.
Fig. 7 is a schematic diagram of a static injury evaluation situation provided by an embodiment of the invention.
Fig. 8a and 8b are schematic diagrams of a marlite matrix reservoir composite sand acid fracturing process provided by an embodiment of the invention.
Fig. 9 is a graph of a release test of a marlite matrix reservoir provided by an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the features and properties of an effective remodeling method for a marl matrix type reservoir of the present application will be described in further detail with reference to the embodiments.
The invention specifically comprises the following steps:
s1 reservoir geological feature analysis
And carrying out geological feature analysis on the marlite reservoir, carrying out systematic understanding on rock mineral components, distribution, structural features, development conditions of bedding joints, rock mechanical parameters, ground stress and the like, and providing corresponding basic parameters for later theoretical research and evaluation.
(1) The shale reservoir lithology characteristics of the Fuling coke dam area are mainly characterized by argillaceous limestone and included spherical limestone. As shown in fig. 1, the mineral components are mainly calcite, followed by talc, quartz and clay minerals, with a small content of pyrite. The structure is characterized in that the eyelids are interacted with the eyeballs, as shown in fig. 2, the gray part in the figure is called an eyeball part, and the gray and black part belongs to the eyelids part. The "eyelid" has the highest calcite content (60%), while the "eyeball" has calcite as the major component (95%). The soaking test shows that the part of the 'eyelid' is mainly used for bubbling, the 'eyelid' is a storage space of shale gas, and the object of key reconstruction is determined to be the 'eyelid'. The sensitive component talc is the softest mineral, the main component is hydrous magnesium silicate, the hydrous magnesium silicate is insoluble in water, does not react with hydrochloric acid, can be dispersed and suspended in the hydrochloric acid, is easy to migrate and even has the phenomena of cementation and solidification, and reservoir protection needs to be considered in measure modification.
(2) The Fuling coke dam has low regional curvature value, spot-shaped local curvature distribution and no strip curvature, is used for integrally evaluating the crack growth failure, and belongs to a matrix reservoir. Meanwhile, the middle part is embedded at the depth of 1000-2500m, the ground temperature gradient is 2.09 ℃/100m, the pressure coefficient is 1.0-1.25, and the material has the characteristics of normal temperature and normal pressure.
(3) The field profile of marlite indicates strong longitudinal heterogeneity. Specifically, the longitudinal distribution of the "eyelid" and the "eyeball" is staged, and the "eyeball" is wrapped in the "eyelid" in a bead-like or intermittent manner (fig. 2). Through a rock mechanics Test, the equipment adopted in the Test is an MTS815 Flex Test GT program control servo rock mechanics Test system, is mainly used for the conventional mechanics tests of electrohydraulic servo control of materials such as rocks, concrete and the like, and is provided with a full-automatic triaxial pressurizing and measuring system with servo control. The test results show that the mechanical property difference in the longitudinal direction of the reservoir is large, three low mechanical characteristics of low compressive strength, low Young modulus and low Poisson ratio are reflected, the stress-strain characteristic analysis is combined, the low brittleness characteristic is totally reflected, the rock breaking strength is weak, and the breaking form is relatively simple (figure 3).
(4) The overall strain strength of the marl reservoir in the Fuling coke dam block is small. Specifically, logging data of the limestone rock density, sound wave, well diameter, well deviation and the like are recorded into an Intech shale stress software, and the horizontal stress difference and the longitudinal stress change condition are simulated and calculated, when the two-direction horizontal stress difference is 3.5-5MPa, the stress difference coefficient is 0.15-0.2, and the longitudinal small-layer stress difference is 0.5-1.5MPa, the reservoir transformation is facilitated on the whole (figure 4). The simulation shows that the stress difference between two horizontal layers is 4MPa, the stress difference coefficient is 0.18, the stress difference of a small layer in the longitudinal direction is small, the maximum difference value is 1.2MPa, and the reservoir transformation condition is met.
S2 research on fracture initiation and dynamic expansion under complex lithology
And establishing a fracture expansion object model and a fracture expansion digital model under complex lithology. Evaluating the crack conductivity contrast condition of the marl under the conventional acidizing, acid fracturing, sand fracturing and acid fracturing composite processes through conventional liquid etching and conductivity experiments; setting the lithology of the marl, the temperature and pressure gradient, the performance of the measure liquid, the construction scale, the size of a matched tubular column and other parameters into a program by using GOFER fracturing professional software, calculating the parameters (the length, the height and the width of a seam) of the artificial fracture under different process technologies, and analyzing the influence of different lithologic distributions on the expansion form of the fracture;
(1) the rock fracture conductivity of marlite under the conventional acidification, acid fracturing, sand fracturing and 'sand fracturing and acid fracturing' combined processes is simulated through a liquid etching and conductivity experiment. The marlite simulates conventional acidification reconstruction, and the result shows that the acid liquor etching action distance is short, effective support is less, and the crack flow conductivity is low; acid fracturing transformation is influenced by muddy coverage, the wall surface mainly adopts point-shaped support, supporting points are relatively few, and the flow conductivity of cracks is not high; the sand fracturing reformation is simulated, the form of a main crack extends forwards along the direction of the maximum main stress, the main crack is influenced by lithologic interaction, eyelid eyeball mixed growth and the like, the crack can turn to a certain degree and generate a dispersed secondary crack to mainly form a bending crack, and the reformation difficulty and the reformation effect have uncertainty. Through testing the flow conductivity of the marl in different processes, experiments show that the flow conductivity is in a decreasing trend along with the increase of the closing pressure, wherein the flow conductivity of the acidification transformation process is the lowest, and the acid fracturing and the fracturing are the lowest. The single transformation process of acidification, acid fracturing and the like is changed into a composite process of sand fracturing and acid fracturing, acid etching is combined with fracture support laying, the flow conductivity under 80MPa of closed pressure is kept about 180D-cm, the flow conductivity of the composite process of sand fracturing and acid fracturing is greatly improved (figure 5), and a sufficient seepage channel can be provided.
(2) By inputting the main parameters of the marlite lithology, the temperature and pressure gradient, the performance of the measure liquid, the construction scale, the size of a matched tubular column and the like, the GOFER fracturing professional software is used for simulating the crack propagation rule under the conventional acidizing, acid fracturing, sand fracturing and acid fracturing combined process. The results show that the reconstruction morphology of conventional acidification, acid fracturing and sand fracturing is relatively regular, wherein the reconstruction volume of conventional acidification and acid fracturing is relatively small, and the reconstruction volume of sand fracturing is second. The reconstruction shape of the sand fracturing and acid fracturing composite process is relatively irregular (figure 6), and the reconstruction volume is the largest. Analysis shows that acid liquor in the conventional acidification and acid fracturing process can perform corrosion reaction with marl rock, so that the extension length of the crack is insufficient; the sand fracturing process is influenced by the interaction of an eyelid and an eyeball of a marlite reservoir and the heterogeneity of lithology, a lot of energy needs to be consumed in the fracture extending process to overcome the resistance caused by the change of the lithology, and the fracture system is relatively difficult to extend. The sand fracturing and acid fracturing combined process can utilize acid liquor to etch the marl to reduce the construction difficulty, ensure the smooth extension of the whole crack system, ensure the sufficient reconstruction volume through the sand fracturing, and is favorable for ensuring the reconstruction effect of complex lithology.
S3 evaluation of damage of working fluid to sensitive minerals
By analyzing the content of the sensitive minerals, the static soaking, acid solution corrosion and dynamic gas infiltration flowing damage evaluation work of working fluids such as acid solution, fracturing fluid and the like on the rock core containing the sensitive minerals under different process technologies is carried out, and a low-damage working fluid system suitable for complex lithology is preferably selected.
(1) And (3) carrying out a static soaking damage evaluation test, wherein the surface of the rock core soaked by clear water is changed from rough to flat, and the analysis is related to particle migration and expansion. Further observing through electron microscope scanning, the rock after being soaked in the acid liquor has 'karst caves' with uneven sizes, wherein a gelled acid system has a certain adsorption film and 'wiredrawing' shaped substances on the surface of the rock core; a plurality of earthworm holes appear on the surface of the clean acid-leaching-soaking rock core, and no obvious attachments are seen; no adsorbate was found on the surface of the core of retarded acids and organic acids. The analytical comparison shows that the cleaning acid, the retarding acid and the organic acid are relatively good in adaptability (figure 7).
(2) Acid solution corrosion and dynamic gas permeation flow damage tests are carried out, the corrosion rate of a 20% hydrochloric acid system is the highest (75%), different acid solution systems are formed by adding a high-molecular thickening agent, a clean thickening agent, an organic additive and a retarding additive into 20% hydrochloric acid respectively, and compared with the rock core permeability change conditions before and after acid squeezing of different acid solution systems, the results show that the damage of the clean acid to a reservoir is relatively lowest, and the damage of the organic acid, the gelled acid and the retarding acid is relatively high (Table 1).
And (4) integrating the static and dynamic evaluation test results to determine that the cleaning acid system is the main acid formula. Meanwhile, a low-viscosity-reduction water-blocking system is adopted as fracturing fluid for crack formation, the relatively high content of talc is considered, the reservoir protection is considered, and the inhibitor and the use concentration of 0.3% are preferably selected aiming at migration prevention. The specific formula of the cleaning acid (by mass percent) is as follows: 20% of HCl + 0.08% of clean thickening agent + 2% of corrosion inhibitor + 1.5% of iron ion stabilizer + 2% of clay stabilizer; the specific formula of the low-viscosity drag reduction water (by mass percent) is as follows: 0.04% drag reducer, 0.3% inhibitor and 0.02% bactericide.
TABLE 1 marlite reservoir gas permeability dynamic damage evaluation
S4 research on key process technology
According to the dynamic expansion morphological research of the cracks under the complex lithology and the evaluation of the matched low-damage working fluid, a set of construction process aiming at the marlite matrix type reservoir is finally formed.
Aiming at a matrix reservoir without crack development, considering the influences of marlite lithology, high talc content and the like, combining the conditions of indoor crack extension research and sensitivity evaluation, the reservoir has stronger sensitivity and conditions for forming complex cracks, and the main body modification process is determined by aiming at expanding the crack volume, etching and improving the flow conductivity, improving the modification strength and strengthening the reservoir protection: water-reducing water + clean acid composite modification process, dessert modification + multiple cluster perforation pattern (fig. 8a and 8 b).
(1) In order to improve the transformation effect, three factors (characteristics such as lithologic change, physical property difference, crack development and the like) are mainly considered based on the heterogeneity of the reservoir, the dessert types are divided, and the horizontal section is finely segmented; meanwhile, in order to reduce influence factors in the sections, ensure uniform crack initiation and crack length extension of each cluster in a single section, and design perforation in a differentiation manner, close cutting perforation is adopted to increase manual crack distribution density, so that high-strength volume transformation of the horizontal section is realized.
(2) In order to increase the transformation volume, the design of the seam promoting length and the volume protection is as follows: the method adopts large discharge capacity (increasing effective reconstruction volume), multi-cluster perforation (increasing crack density), water-reducing blocking agent (ensuring crack formation and gas leakage volume)
(3) In order to ensure a seepage channel, the flow conductivity is designed to be enhanced: and clean acid is adopted for etching, so that the length and the flow conductivity of acid etching cracks are enhanced.
The invention is used as an effective reconstruction method for a marlite matrix type reservoir, and according to the characteristics research of complex lithology of eyeball/eyelid interaction, sensitive minerals and longitudinal and plane non-uniform properties, the fracture initiation and expansion forms of the reservoir are clearly mastered, and a composite sand-adding acid fracturing reconstruction process different from the conventional measure process is formulated; and meanwhile, the influence of sensitive minerals on the transformation effect is known, matched low-damage working fluid is preferably selected, secondary damage is reduced, invalid transformation is avoided, and the reservoir is fully used, so that the optimal transformation effect and the optimal economic benefit are obtained. The method is applied to the Fuling coke dam block for the first time, makes a breakthrough in the test yield of the matrix type marl reservoir and obtains the stable industrial airflow of 4.02 ten thousand square/day.
The embodiments described above are some, but not all embodiments of the present application. The detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Claims (10)
1. An effective reconstruction method for a marlite matrix type reservoir, characterized in that: the method comprises the following steps:
s1 reservoir geological feature analysis
Carrying out geological feature analysis of a marlite reservoir, systematically knowing rock mineral components and distribution, structural features, development conditions of bedding joints, rock mechanical parameters and ground stress, and providing corresponding basic parameters for later theoretical research and evaluation;
s2 research on fracture initiation and dynamic expansion under complex lithology
Establishing a fracture expansion object model and a fracture expansion digital model under complex lithology: evaluating the crack conductivity contrast condition of the marl under the conventional acidizing, acid fracturing, sand fracturing and acid fracturing composite processes through conventional liquid etching and conductivity experiments; setting parameters such as marlite lithology, temperature and pressure gradient, performance of a measure liquid, construction scale, size of a matched tubular column and the like into a program by using GOFER fracturing professional software, and influencing crack expansion forms under different process technologies;
s3, analyzing damage evaluation of working fluid to sensitive minerals
By analyzing the content of the sensitive minerals, the static soaking, acid liquor corrosion and dynamic gas infiltration flowing damage evaluation work of the working fluid on the rock core containing the sensitive minerals under different process technologies is carried out, and a low-damage working fluid system suitable for complex lithology is preferably selected;
s4 research on key process technology
According to the dynamic expansion morphological research of the cracks under the complex lithology and the evaluation of the matched low-damage working fluid, a set of construction process aiming at the marlite matrix type reservoir is finally formed.
2. An efficient retrofitting method for marl matrix type reservoirs according to claim 1, characterized in that: in step S1, the shale reservoir lithology characteristics are analyzed mainly based on the argillaceous limestone with a hole-shaped marl, and the key reconstruction object is determined through a water immersion test.
3. An efficient retrofitting method for marl matrix type reservoirs according to claim 1, characterized in that: and in the step S1, mechanical characteristics of the marl reservoir are analyzed through a rock mechanical test and a full-automatic triaxial pressurizing and measuring system matched with servo control and by combining stress-strain characteristics.
4. A method for efficient stimulation of a marl matrix reservoir according to claim 3, characterized in that: in step S1, when analyzing the overall strain condition of the marlite reservoir, recording the main logging data of reservoir rock density, acoustic wave, well diameter, and well deviation into the Intech shale stress software, and calculating the horizontal stress difference and longitudinal stress variation conditions in a simulation manner, and when the two-directional horizontal stress difference, the stress difference coefficient, and the maximum difference of the longitudinal upper small layer stress satisfy the design values, the overall reservoir reconstruction is facilitated.
5. An efficient retrofitting method for marl matrix type reservoirs according to claim 1 or 2, characterized in that: in step S2, the fracture conductivity of the marlite under the conventional acidizing, acid fracturing, sand fracturing and the 'sand fracturing and acid fracturing' composite process is simulated through a liquid etching and conductivity experiment.
6. An efficient retrofitting method for marlite based reservoirs according to claim 5, characterized in that: in step S2, GOFER fracturing professional software is used to simulate the fracture propagation rules of conventional acidizing, acid fracturing, sand fracturing and a sand fracturing and acid fracturing composite process under complex lithology by inputting the parameters of marlite lithology, temperature and pressure gradient, performance of the measure liquid, construction scale and size of a matched tubular column.
7. An efficient retrofitting method for marl matrix type reservoirs according to claim 1 or 2, characterized in that: in the step S3, a static soaking damage evaluation test is carried out, and the change condition of the surface of the core is observed through soaking the core in clear water; further observing the change condition analysis of the surfaces of the soaked rock cores of different acid liquid systems through scanning of an electron microscope; and carrying out acid liquor corrosion and dynamic gas permeability dynamic damage tests, and comparing the permeability change conditions before and after different acid liquor systems are injected into the rock core.
8. An efficient retrofitting method for marl matrix type reservoirs according to claim 7, characterized in that: in step S3, in the acid solution corrosion and dynamic cavitation dynamic damage test, the corrosion rate of the 20% hydrochloric acid system is the highest, and the test is performed by adding different components to the 20% hydrochloric acid to form different acid solution systems.
9. An efficient retrofitting method for marl matrix type reservoirs according to claim 1 or 2, characterized in that: in step S4, for a matrix reservoir in which fractures do not develop, the influence of factors such as marlite lithology and high talc content is considered, and in combination with the indoor fracture propagation research and sensitivity evaluation conditions, the reservoir has strong sensitivity and conditions for forming complex fractures, and the main reconstruction process is defined with the goals of 'expanding fracture volume, etching to improve conductivity, improving reconstruction strength and strengthening reservoir protection'.
10. An efficient retrofitting method for marl matrix type reservoirs according to claim 9, characterized in that: in step S4, the modification method includes:
(1) in order to improve the transformation effect, three factors, namely lithologic change, physical property difference and crack development, are considered in an important way based on the heterogeneity of a reservoir, dessert types are divided, and the horizontal section is finely segmented; meanwhile, in order to reduce influence factors in the sections, ensure uniform crack initiation and crack length extension of each cluster in a single section, design perforation in a differentiation manner, increase manual crack distribution density by adopting close cutting perforation and realize high-strength volume of a horizontal section;
(2) in order to increase the transformation volume, the design of the seam promoting length and the volume protection is as follows: a large-displacement and multi-cluster perforation and drag reduction water carrying proppant process is adopted;
(3) in order to ensure a seepage channel, the flow conductivity is designed to be enhanced: and a clean acid system is adopted for etching, so that the length and the flow conductivity of an acid etching crack are enhanced.
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Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140352949A1 (en) * | 2013-05-29 | 2014-12-04 | Conocophillips Company | Integrating rock ductility with fracture propagation mechanics for hydraulic fracture design |
| CN104278980A (en) * | 2013-07-09 | 2015-01-14 | 中国石油天然气股份有限公司 | Method for optimizing tight oil horizontal well crack network parameters through transformation volume |
| CN104853822A (en) * | 2014-09-19 | 2015-08-19 | 杨顺伟 | Method for evaluating shale gas reservoir and searching sweet spot region |
| CN105909226A (en) * | 2016-04-22 | 2016-08-31 | 中国石油天然气股份有限公司 | Method for improving seam net complexity through circulation stress fracturing |
| CN107991188A (en) * | 2016-10-26 | 2018-05-04 | 中国石油化工股份有限公司 | A kind of method based on rock core residual stress level prediction hydraulic fracture complexity |
| CN109958426A (en) * | 2017-12-26 | 2019-07-02 | 中国石油化工股份有限公司 | A kind of fracturing process improving deep layer shale gas crack complexity |
| CN110094196A (en) * | 2019-04-19 | 2019-08-06 | 西南石油大学 | A kind of carbonate rock open-hole horizontal well segmentation acid fracturing effect evaluation method |
| CN110134984A (en) * | 2019-03-06 | 2019-08-16 | 中国石油化工股份有限公司江汉油田分公司石油工程技术研究院 | The analysis method of complex fracture extension influence factor in a kind of shale fracturing process |
| CN110424939A (en) * | 2019-08-12 | 2019-11-08 | 西南石油大学 | A method of increasing gneiss oil-gas reservoir and stitches net volume fracturing effect |
| CN110781617A (en) * | 2018-07-30 | 2020-02-11 | 中国石油化工股份有限公司 | Fracture complexity identification method for temporary plugging of fracturing fracture in fracture based on digital analogy |
| CN111487172A (en) * | 2019-01-28 | 2020-08-04 | 中国石油天然气股份有限公司 | Device and method for evaluating flow conductivity of acid-etched fracture of tight reservoir core |
| CN111931401A (en) * | 2020-07-21 | 2020-11-13 | 中国石油大学(华东) | Rapid determination method for multi-stage fracturing reconstruction mode of compact oil horizontal well |
| CN112100707A (en) * | 2019-05-31 | 2020-12-18 | 中国石油化工股份有限公司 | Construction method of through-layer fracturing plate |
| CN112211608A (en) * | 2019-07-09 | 2021-01-12 | 中国石油化工股份有限公司 | Fracturing method for shale reservoir microfracture self-supporting |
| CN112377186A (en) * | 2020-11-30 | 2021-02-19 | 中国石油天然气股份有限公司 | Dumbbell-shaped fracture-cave type carbonate reservoir yield analysis model construction method and device |
| CN112709561A (en) * | 2019-10-24 | 2021-04-27 | 中国石油化工股份有限公司 | Low-pressure compact marlite reservoir transformation method |
| CN112780246A (en) * | 2021-02-28 | 2021-05-11 | 西南石油大学 | Organic acid solution treatment method for enhancing and maintaining flow conductivity of tight sandstone reservoir fracture |
| CN113312785A (en) * | 2021-06-10 | 2021-08-27 | 西南石油大学 | Deep shale gas reservoir fracturing optimization method based on compressibility evaluation |
Patent Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140352949A1 (en) * | 2013-05-29 | 2014-12-04 | Conocophillips Company | Integrating rock ductility with fracture propagation mechanics for hydraulic fracture design |
| CN104278980A (en) * | 2013-07-09 | 2015-01-14 | 中国石油天然气股份有限公司 | Method for optimizing tight oil horizontal well crack network parameters through transformation volume |
| CN104853822A (en) * | 2014-09-19 | 2015-08-19 | 杨顺伟 | Method for evaluating shale gas reservoir and searching sweet spot region |
| CN105909226A (en) * | 2016-04-22 | 2016-08-31 | 中国石油天然气股份有限公司 | Method for improving seam net complexity through circulation stress fracturing |
| CN107991188A (en) * | 2016-10-26 | 2018-05-04 | 中国石油化工股份有限公司 | A kind of method based on rock core residual stress level prediction hydraulic fracture complexity |
| CN109958426A (en) * | 2017-12-26 | 2019-07-02 | 中国石油化工股份有限公司 | A kind of fracturing process improving deep layer shale gas crack complexity |
| CN110781617A (en) * | 2018-07-30 | 2020-02-11 | 中国石油化工股份有限公司 | Fracture complexity identification method for temporary plugging of fracturing fracture in fracture based on digital analogy |
| CN111487172A (en) * | 2019-01-28 | 2020-08-04 | 中国石油天然气股份有限公司 | Device and method for evaluating flow conductivity of acid-etched fracture of tight reservoir core |
| CN110134984A (en) * | 2019-03-06 | 2019-08-16 | 中国石油化工股份有限公司江汉油田分公司石油工程技术研究院 | The analysis method of complex fracture extension influence factor in a kind of shale fracturing process |
| CN110094196A (en) * | 2019-04-19 | 2019-08-06 | 西南石油大学 | A kind of carbonate rock open-hole horizontal well segmentation acid fracturing effect evaluation method |
| CN112100707A (en) * | 2019-05-31 | 2020-12-18 | 中国石油化工股份有限公司 | Construction method of through-layer fracturing plate |
| CN112211608A (en) * | 2019-07-09 | 2021-01-12 | 中国石油化工股份有限公司 | Fracturing method for shale reservoir microfracture self-supporting |
| CN110424939A (en) * | 2019-08-12 | 2019-11-08 | 西南石油大学 | A method of increasing gneiss oil-gas reservoir and stitches net volume fracturing effect |
| CN112709561A (en) * | 2019-10-24 | 2021-04-27 | 中国石油化工股份有限公司 | Low-pressure compact marlite reservoir transformation method |
| CN111931401A (en) * | 2020-07-21 | 2020-11-13 | 中国石油大学(华东) | Rapid determination method for multi-stage fracturing reconstruction mode of compact oil horizontal well |
| CN112377186A (en) * | 2020-11-30 | 2021-02-19 | 中国石油天然气股份有限公司 | Dumbbell-shaped fracture-cave type carbonate reservoir yield analysis model construction method and device |
| CN112780246A (en) * | 2021-02-28 | 2021-05-11 | 西南石油大学 | Organic acid solution treatment method for enhancing and maintaining flow conductivity of tight sandstone reservoir fracture |
| CN113312785A (en) * | 2021-06-10 | 2021-08-27 | 西南石油大学 | Deep shale gas reservoir fracturing optimization method based on compressibility evaluation |
Non-Patent Citations (1)
| Title |
|---|
| 张平: "低渗透底水油藏压裂技术研究与应用", 中国优秀博士学位论文全文数据库工程科技Ⅰ辑, pages 019 - 4 * |
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