CN111852426B - Method for testing interference between pressure fractures between wells - Google Patents
Method for testing interference between pressure fractures between wells Download PDFInfo
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- CN111852426B CN111852426B CN201910335829.XA CN201910335829A CN111852426B CN 111852426 B CN111852426 B CN 111852426B CN 201910335829 A CN201910335829 A CN 201910335829A CN 111852426 B CN111852426 B CN 111852426B
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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
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- 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 a method for testing interference between pressing cracks of wells, which comprises the following steps: injecting a water phase agent into the test well during sand blasting and fracturing operation; in the sand blasting and fracturing operation process, when the sand adding amount is more than 7/10, injecting an oil phase agent into the test well; stopping injecting the oil phase agent when the sand adding amount reaches 9/10; and (5) sampling and testing to judge whether seam channeling occurs or not. The invention solves the problem of poor accuracy of the inter-seam interference detection in the prior art.
Description
Technical Field
The invention relates to the technical field of sand blasting fracturing operation of horizontal wells, in particular to a method for testing interference between pressure fractures of wells.
Background
Horizontal well segmentation multicluster fracturing has played huge effect in hyposmosis oil and gas reservoir development, for further promoting oil and gas output, fracturing section, cluster number constantly increase, have also aggravated the interfracture interference problem simultaneously. Induced stress interference generated by the fractures is reasonably utilized to promote fracture grids to be formed, so that the reservoir reconstruction volume is increased. However, too high induced stress interference may also cause inter-seam interference or inter-well fracturing inter-seam interference, so the inter-seam interference problem should be studied.
To make better use of the interference between seams, researchers at home and abroad have conducted many related studies. The Wangburg et al establishes models of different crack length and distribution relations and researches the mechanical principle of the interference between cracks in the process of fracturing the inclined shaft. Under the condition of considering the closure degree of the natural cracks, zhao Jinzhou and the like establish a stress field model of the hydraulic cracks approaching to the natural crack surfaces based on elastic mechanics and fracture mechanics theories, and analyze the stability problem of the hydraulic cracks interfering the natural cracks. Olson et al studied the mutual interference effects that occurred between fractures according to a mathematical model of staged fracturing of horizontal wells. Ajani et al performed data analysis based on a large number of horizontal fracture well data to study the interference problems prevalent in shale reservoir fracturing.
The related research mainly uses indoor model research or mass fracturing well analysis to commonly have the problem of interference probability, and the stability and the accuracy of detection are poor, and the authenticity and the pertinence of the detection result are lower.
Disclosure of Invention
The invention mainly aims to provide a method for testing the inter-well pressure fracture and inter-seam interference, so as to solve the problem of poor accuracy of inter-seam interference detection in the prior art.
In order to achieve the above object, the present invention provides a method for testing interference between fractures of a well, comprising: injecting a water phase agent into the test well during sand blasting and fracturing operation; in the sand blasting and fracturing operation process, when the sand adding amount is more than 7/10, injecting an oil phase agent into the test well; stopping injecting the oil phase agent when the sand adding amount reaches 9/10; and (5) sampling and testing to judge whether seam channeling occurs or not.
Further, when the water phase agent is injected into the test well, the constant flow pump used for injecting the water phase agent is adjusted, so that the concentration of the water phase agent in the fracturing fluid is uniform and consistent.
And further, when the concentrations of the water phase agents in the fracturing fluid are uniform, detecting whether the injection speed of the fracturing fluid is changed, and if so, readjusting the constant flow pump until the injection speed of the fracturing fluid is not changed.
Further, when the oil phase agent is injected into the test well, the oil phase agent is uniformly injected into the test well.
Further, during sand blasting fracturing operation, the water phase agent is always injected into the test well.
Furthermore, when sampling test is carried out, the detection is carried out by adopting a time-sharing sampling and comprehensive testing mode.
Further, when the detection is carried out, the detection content comprises the tracing type, the flowback rate and the contribution rate of each fracturing segment.
Further, when sampling test is carried out, liquid in an adjacent well adjacent to the test well or flow-back liquid of the test well is selected for detection.
Further, when judging whether seam crossing occurs, if the same tracing type as that in the test well appears in the liquid or the flowback liquid, the seam crossing occurs; if the same tracing type as that in the test well does not appear in the liquid or the flowback liquid, no seam channeling occurs.
Further, the method further comprises a pre-processing procedure, the pre-processing procedure comprising: collecting data of the test well and compiling a construction scheme; and (5) carrying out preparation work before construction, and preparing a tracer and related equipment.
By applying the technical scheme of the invention, the method for testing the interference between the pressure fractures of the wells comprises the following steps: injecting a water phase agent into the test well during sand blasting and fracturing operation; in the sand blasting and fracturing operation process, when the sand adding amount is more than 7/10, injecting an oil phase agent into the test well; stopping injecting the oil phase agent when the sand adding amount reaches 9/10; and (5) sampling and testing to judge whether seam channeling occurs or not.
The novel tracer agent is formed by the water phase agent and the oil phase agent, the novel tracer agent has the characteristics of multiple types, easiness in detection, good stability and the like, different types of tracer agents are injected into each fracturing section along with fracturing fluid, the water phase agent is injected all the time in the whole operation process, the oil phase agent is injected in the process of adding sand from 7/10 to 9/10, meanwhile, sampling test is carried out by utilizing the characteristic that different fracturing sections are not discharged back at the same time, the fracturing effect and the inter-fracture interference test result of the fracturing well are more visual and accurate, meanwhile, operation and implementation are carried out on the site, qualitative development is carried out into quantitative description, and the inter-fracture interference test is more real and more targeted.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 shows a flow chart of a method of testing for inter-well fracturing fracture interference of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
In the present invention, unless stated to the contrary, the use of directional terms such as "upper, lower, top, bottom" or the like, generally refers to the orientation of the components as shown in the drawings, or to the vertical, perpendicular, or gravitational orientation of the components themselves; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.
The invention provides a method for testing the inter-well pressure fracture and inter-seam interference, aiming at solving the problem of poor accuracy of inter-seam interference detection in the prior art.
A method for testing the interference between the fractures of the well fracturing shown in fig. 1 comprises the following steps: injecting a water phase agent into the test well during sand blasting and fracturing operation; in the sand blasting and fracturing operation process, when the sand adding amount is more than 7/10, injecting an oil phase agent into the test well; stopping injecting the oil phase agent when the sand adding amount reaches 9/10; and (5) sampling and testing to judge whether seam channeling occurs or not.
The novel tracer is formed by the water phase agent and the oil phase agent, the novel tracer has the characteristics of multiple types, easiness in detection, good stability and the like, different types of tracers are injected into each fracturing section along with fracturing fluid, the water phase agent is injected all the time in the whole operation process, the oil phase agent is injected in the process of adding 7/10 to 9/10 of sand, meanwhile, sampling test is carried out by utilizing the characteristic that different fracturing sections are not discharged back at the same time, the fracturing effect and the inter-fracture interference test result of the fracturing well are more visual and accurate, meanwhile, operation and implementation are carried out on site, and qualitative development is carried out into quantitative description, so that the inter-fracture interference test is more real and more targeted.
In this embodiment, when the aqueous phase agent is injected into the test well, the constant flow pump used for injecting the aqueous phase agent is adjusted, so that the concentrations of the aqueous phase agent in the fracturing fluid are uniform and consistent, when the concentrations of the aqueous phase agent in the fracturing fluid are uniform and consistent, whether the injection speed of the fracturing fluid changes or not is detected, if so, the constant flow pump is adjusted again until the injection speed of the fracturing fluid does not change, and then the injection state is maintained until the test is finished.
In this embodiment, when the oil phase agent is injected into the test well, the oil phase agent is uniformly injected into the test well.
It should be noted that, in the sand blasting fracturing operation, the water phase agent is injected into the test well all the time until the fracturing operation is finished.
In this embodiment, in the sampling test, the detection is performed by time-sharing sampling and comprehensive testing.
Specifically, liquid in an adjacent well adjacent to the test well or flow-back liquid of the test well is selected for detection, and the detection content comprises the tracing type, the flow-back rate and the contribution rate of each fracturing section. And judging whether seam channeling occurs or not, if the tracing type identical to that in the test well appears in the liquid or the flow-back liquid, seam channeling occurs, and if the tracing type identical to that in the test well does not appear in the liquid or the flow-back liquid, seam channeling does not occur.
The test method in this embodiment further includes a preprocessing process, and the preprocessing process includes: collecting data of the test well and compiling a construction scheme; and (5) preparing the tracer and related equipment before construction.
The specific implementation process of the testing method for the inter-well pressure fracture interference in the embodiment is as follows:
1. carrying out a pretreatment process;
2. injecting a water phase agent into the test well, implementing adjustment of the constant flow pump, ensuring that the concentration of the water phase agent in the fracturing fluid is uniform and consistent, and ensuring that the injection speed of the fracturing fluid does not change any more;
3. when 7/10 of sand is added, starting to uniformly inject an oil phase agent into the test well until 9/10 of sand is added, and keeping injecting an aqueous phase agent during the period;
4. sampling from an adjacent well or performing time-sharing sampling and comprehensive testing by using the flowback fluid, and checking and judging whether seam channeling occurs or not.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
1. the problem of poor accuracy of the inter-seam interference detection in the prior art is solved;
2. the inter-seam interference test result is more visual and accurate;
3. the inter-seam interference test is more real and targeted.
It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A method for testing interference between pressure fractures of wells is characterized by comprising the following steps:
injecting a water phase agent into the test well during sand blasting and fracturing operation;
in the sand blasting fracturing operation process, when the sand adding amount is larger than 7/10, injecting an oil phase agent into the test well, and when the oil phase agent is injected into the test well, uniformly injecting the oil phase agent into the test well;
stopping injecting the oil phase agent when the sand adding amount reaches 9/10;
carrying out sampling test to judge whether seam channeling occurs;
when the aqueous phase agent is injected into the test well, a constant flow pump used for injecting the aqueous phase agent is adjusted, so that the concentration of the aqueous phase agent in the fracturing fluid is uniform and consistent, when the concentration of the aqueous phase agent in the fracturing fluid is uniform and consistent, whether the injection speed of the fracturing fluid is changed or not is detected, if the injection speed of the fracturing fluid is changed, the constant flow pump is adjusted again until the injection speed of the fracturing fluid is not changed, and the aqueous phase agent is always injected into the test well during sand blasting and fracturing operation.
2. The test method according to claim 1, wherein the sampling test is performed by time-division sampling and comprehensive testing.
3. The test method according to claim 2, wherein, when performing the detection, the detection content comprises a tracing type, a flowback rate and a contribution rate of each fracture section.
4. The method of claim 2, wherein the liquid in an adjacent well adjacent to the test well or the flow back of the test well is selected for detection when performing the sampling test.
5. The test method according to claim 4, wherein when it is judged whether or not seam crossing occurs,
if the liquid or the flowback fluid has the same tracing type as that in the test well, seam channeling occurs;
and if the liquid or the flowback liquid does not have the same tracing type as that in the test well, no seam channeling occurs.
6. The testing method of claim 1, further comprising a pre-processing procedure, the pre-processing procedure comprising:
collecting the data of the test well, and compiling a construction scheme;
and (5) carrying out preparation work before construction, and preparing a tracer and related equipment.
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| CN201910335829.XA CN111852426B (en) | 2019-04-24 | 2019-04-24 | Method for testing interference between pressure fractures between wells |
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| CN201910335829.XA CN111852426B (en) | 2019-04-24 | 2019-04-24 | Method for testing interference between pressure fractures between wells |
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| WO2012091599A1 (en) * | 2010-12-30 | 2012-07-05 | Schlumberger Holdings Limited | Method for tracking a treatment fluid in a subterranean formation |
| AR103486A1 (en) * | 2015-01-23 | 2017-05-10 | Schlumberger Technology Bv | CONTROL SYSTEM AND METHOD OF FLOW RETURN OPERATIONS FOR BITUMINOUS SKIS FACILITIES |
| CN106014389B (en) * | 2016-04-26 | 2019-05-07 | 中国石油天然气股份有限公司 | A method of it is contributed using each section of grease of chemical tracer test volume pressure break horizontal well |
| CN106401552A (en) * | 2016-11-02 | 2017-02-15 | 中国石油化工股份有限公司 | Post-fracture flow-back tracking detecting method for horizontal well |
| CN107989588B (en) * | 2017-11-10 | 2020-04-17 | 东方宝麟科技发展(北京)有限公司 | Method and system for testing oil-gas-water profile of each section of horizontal well by using environment-friendly tracer |
| CN108729909A (en) * | 2018-06-01 | 2018-11-02 | 青岛大地新能源技术研究院 | A method of utilizing Uranium determination agent level monitoring well staged fracturing effect |
| CN109113704A (en) * | 2018-08-09 | 2019-01-01 | 中国石油天然气股份有限公司 | Multistage fracturing returns the tracer monitoring method of drain |
| CN109577959B (en) * | 2019-01-23 | 2022-03-11 | 四川富利斯达石油科技发展有限公司 | Method for measuring crack connectivity of adjacent fracturing sections by using tracer |
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