CN114622887A - Single-well zipper-type fracturing gas testing construction method - Google Patents
Single-well zipper-type fracturing gas testing construction method Download PDFInfo
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- CN114622887A CN114622887A CN202210124599.4A CN202210124599A CN114622887A CN 114622887 A CN114622887 A CN 114622887A CN 202210124599 A CN202210124599 A CN 202210124599A CN 114622887 A CN114622887 A CN 114622887A
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- 238000010276 construction Methods 0.000 title claims abstract description 19
- 238000012360 testing method Methods 0.000 title claims abstract description 19
- 239000004576 sand Substances 0.000 claims description 14
- 238000005086 pumping Methods 0.000 claims description 8
- 239000000835 fiber Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 8
- 239000010865 sewage Substances 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 26
- 239000012530 fluid Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 9
- 239000011159 matrix material Substances 0.000 description 9
- 238000011161 development Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000012736 aqueous medium Substances 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 210000002489 tectorial membrane Anatomy 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000002354 daily effect Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 239000003657 drainage water Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000002609 medium Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
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- 238000002360 preparation method Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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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- General Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a single-well zipper type fracturing gas testing construction method which comprises a fracturing period and a whole-well blowout period, wherein during the fracturing period, multi-stage fracturing operation is carried out in the daytime, blowout operation is carried out at night, the multi-stage fracturing operation and the blowout operation are carried out alternately, and the whole-well blowout period is started after the multi-stage fracturing operation is carried out in the daytime in the last day. The method is easy to operate, environment-friendly, energy-saving and emission-reducing, can effectively shorten the construction period, saves the operation cost, and solves the problems of insufficient normal-pressure gas reservoir flowback energy, serious reservoir water damage and high single-well flowback sewage treatment cost.
Description
Technical Field
The invention relates to the field of oil exploitation, in particular to a single-well zipper type fracturing gas testing construction method.
Background
With the increasing demand of energy, shale gas is more and more concerned as a novel unconventional natural gas resource. At the present stage, commercial development of high-pressure shale gas reservoirs is successfully realized in China, but the efficient development technology of normal-pressure shale is still in an exploration stage. The normal-pressure shale reservoir in China is mainly located outside a basin and has the advantages of syncline residual, strong structural deformation degree, stratum pressure coefficient of 0.9-1.3, shallow burial depth and insufficient stratum energy, and a commercial breakthrough is not formed so far.
Atmospheric shale reservoir characteristics dictate that high-production industrial gas streams must be obtained through fracturing modification, posing greater challenges to the fracturing process. The effective development measures aiming at the normal pressure shale gas in China in recent years are summarized, and the three aspects of improving the transformation effect, reducing the transformation cost and strengthening the back-flow after pressure are mainly focused. The method aims at the problems that normal pressure shale gas testing gas is low in stratum pressure coefficient, large in fracturing scale, low in flowback after being pressed, low in wellhead pressure and low in yield, long in drainage and production cycle and the like, particularly the drainage and production technology becomes a bottleneck technology of domestic shale gas development, and drainage and production technologies such as shale gas production foam drainage, gas lift drainage, electric submersible pump drainage, jet pump drainage and the like are formed. In the fracturing gas testing mode, the normal-pressure shale gas still adopts a development mode of single well gradual fracturing of the high-pressure shale gas → whole well drilling plug → natural flowback → artificial drainage assistance, and the development mode is considered to have great irrationality through a large amount of normal-pressure well data analysis. Firstly, due to the fracturing energizing effect, a higher seepage pressure difference exists between a crack and a matrix, an improved toe end part reservoir continuously seeps from the crack to the matrix for a long time under the high seepage pressure difference environment, the water saturation of the matrix is increased, the gas phase permeability is reduced, a water lock effect is formed, and the migration of gas to the crack is hindered; secondly, because the aqueous medium in the modified fracture continuously seeps into the matrix, almost no energy is naturally drained back from a toe-end reservoir layer after 2-3 weeks of pressure drop, and a manual drainage-assisting means with long period and high price is required; thirdly, a large amount of return drainage water which is uniformly returned and discharged after being pressed generates high transportation and environmental protection cost under the condition that no return injection well exists; finally, the process mode cannot fully utilize the night time, the fracturing gas testing period is over 2 months generally, and the gas testing period is long.
Disclosure of Invention
The invention aims to solve the technical problems and provide the single-well zipper-type fracturing gas testing construction method which is easy to operate, environment-friendly, energy-saving and emission-reducing, can effectively shorten the construction period, saves the operation cost, and solves the problems of insufficient flow-back energy of a normal-pressure gas reservoir, serious damage to reservoir water and high single-well reverse drainage sewage treatment cost.
The technical scheme includes that the fracturing period and the open flow period are included, during the fracturing period, multi-section fracturing operation is mainly performed in the daytime, open flow operation is performed at night and is performed alternately, and the whole well open flow period is entered after multi-section fracturing operation is performed in the daytime on the last day.
Collecting the flowback liquid of the open flow operation in the former day and at night, and preparing the fracturing liquid for use when the multi-section fracturing operation is carried out in the next day.
And pumping and perforating bridge plug combination is carried out after the last section of fracturing operation in the day is finished, and then blowout operation at night is carried out under the condition of not throwing a bridge plug ball.
After the blowout operation at night is finished, the bridge plug ball is put in, and then the multi-section fracturing operation at the daytime is carried out.
The bridge plug is a soluble or insoluble bridge plug which can meet the bottom hole pressure-bearing requirement of the open-flow environment for more than 12 hours, and the bridge plug ball is a soluble ball.
The proppant used at the later stage of fracturing may be a coated proppant.
And adding sand control fibers into the proppant used in the later stage of fracturing.
Aiming at the problems existing in the background technology, the inventor conducts deep analysis, and introduces the blowout operation every night in the fracturing period, and the following multiple technical effects are achieved: (1) the fracturing energy of daily fracturing operation can be utilized to discharge the aqueous medium in the fractures in time, so that the pressure difference between the fractures and the matrix is reduced in time, the seepage of the aqueous medium in the fractures to the matrix is effectively reduced, and the water damage of the matrix of the reservoir is reduced; (2) because the open flow operation at night every day is positioned after the multi-stage fracturing operation at day, the fluid entering the well is not ready to diffuse, the well mouth has higher pressure, the fracturing energy can be fully utilized for natural flowback, and the manual discharge assistance is not needed in the initial stage, so that the load of the manual discharge assistance in the open flow period of the whole well is further reduced, and the purposes of saving the operation cost, saving time and saving labor are achieved; (3) the open flow operation is carried out by fully utilizing the night time period, and the water medium in part of cracks is discharged in advance, so that the time required by the open flow period of the whole well is further reduced; (4) the flowback fluid of open flow operation at night can be directly used for preparing fracturing fluid for fracturing operation in the next day, and is skillfully recycled, so that the external water consumed by preparing the fracturing fluid in the fracturing period is reduced, the pressure of a large amount of flowback fluid discharged at one time in the open flow period of the whole well on the environment is avoided, the environment is protected, and the energy and emission are further reduced; (5) the open flow operation in the fracturing period is arranged to be carried out at night, the construction clearance is fully utilized, the construction period of the open flow period of the whole well is greatly shortened on the premise of not increasing the construction period in the fracturing period, the whole fracturing gas testing period can be shortened by more than 15 days, and the speed increasing effect is remarkable.
Furthermore, pumping perforation bridge plug combination is carried out after the last section of fracturing operation in the day is finished, then blowout operation is carried out at night under the condition that a bridge plug ball is not thrown, and pumping before blowout is selected, so that pumping jamming caused by formation sand production in blowout can be avoided; the bridge plug type is a ball-throwing bridge plug, preferably a soluble or insoluble bridge plug meeting the bottom hole pressure-bearing requirement of the blowout environment for more than 12 hours, and the bridge plug ball can be a common bridge plug ball, but the soluble ball is adopted, so that the smoothness of a fractured section of a shaft can be improved, and the flowback of a toe end well section is facilitated; the proppant used in the later stage of fracturing is preferably a tectorial membrane proppant, more preferably, sand control fibers are added on the basis of the tectorial membrane proppant, resin membranes of the tectorial membrane proppant are mutually intersected to form a complete sand body, a fiber network formed by the sand control fibers has a good sand control effect, and the combination of the two can effectively reduce the sand production of the stratum. The mixing ratio of the two is not particularly limited, and those skilled in the art can reasonably mix the components as required.
The invention can not only fully utilize the energy after the pressure, improve the natural flowback rate, but also reduce the fluid pressure difference between the crack and the matrix in time and reduce the seepage of the aqueous medium in the crack to the matrix. And the fracturing flow-back fluid can be prepared into the fracturing fluid in situ for reinjection and utilization, the sewage transportation environmental protection cost is reduced, and the gas testing period is reduced by more than 15 days compared with the conventional construction mode. The fracturing gas testing mode has stronger adaptability when being used for single well construction, is suitable for normal pressure shale gas reservoirs, and is also suitable for reservoirs with high water sensitivity, such as dense gas, coal bed gas and the like.
Drawings
FIG. 1 is a process flow diagram of the present invention.
FIG. 2 is a sequence diagram of single day operations according to the present invention.
Detailed Description
The process of the invention is further illustrated below with reference to the accompanying drawings:
referring to fig. 1, the method comprises a fracturing period and a blowout period, wherein during the fracturing period, multi-stage fracturing operation is carried out in the daytime, blowout operation is carried out at night, the fracturing operation and the blowout operation are carried out alternately, multi-stage fracturing operation and blowout operation are carried out on the last day, the whole well is put into the blowout period after a plug is drilled, and when the yield is stable, the whole well blowout period is ended.
Collecting the flowback liquid of the open flow operation in the former day and at night, and preparing the fracturing liquid for use when performing multi-section fracturing operation in the next day; pumping a perforation bridge plug for combination after the last section of fracturing operation in the day is finished, and then performing blowout operation at night under the condition of not throwing a bridge plug ball; after the blowout operation at night is finished, the multistage fracturing operation in the daytime is carried out after the bridge plug ball is put in, and the bridge plug ball is prevented from being dissolved.
The selected bridge plug needs to meet the bottom hole pressure-bearing requirement of the open flow environment for more than 12 hours, the bridge plug ball can be a soluble ball, and the smoothness of the whole shaft is guaranteed as much as possible during open flow.
The proppant used in the later stage of fracturing can be a coated proppant to reduce the blowout sand. In order to improve the sand control effect, the sand control fiber can be added into the proppant at the later stage of fracturing so as to reduce the blowout sand. It needs to be noted that when the open flow operation is carried out at night, the sand production condition is observed to control the size of the oil nozzle, so that the sand production of a wellhead is reduced.
Pumping a perforation bridge plug for combination after the last section of fracturing operation in the day is finished, and then performing blowout operation at night under the condition of not throwing a bridge plug ball; after the blowout operation at night is finished, the bridge plug ball is put in, and then the multi-section fracturing operation at the daytime is carried out.
The concrete operation methods of the fracturing operation, the blowout operation, the pumping perforation bridge plug combined operation and the fracturing fluid preparation in the fracturing period are all the prior art and are not detailed here; the open flow operation method in the open flow period of the whole well is also the prior art and is not detailed.
Claims (7)
1. A single-well zipper type fracturing gas testing construction method comprises a fracturing period and a blowout period and is characterized in that during the fracturing period, multi-stage fracturing operation is mainly performed in the daytime, blowout operation is performed at night and is performed alternately, and after multi-stage fracturing operation is performed in the day of the last day, the whole-well blowout period is started.
2. The single-well zipper-type fracturing gas testing construction method of claim 1, wherein the flowback liquid of the open flow operation in the previous day and at night is collected, and the fracturing liquid is prepared for use when the multi-stage fracturing operation is carried out in the next day.
3. The single-well 'zip-type' fracturing gas testing construction method according to claim 1 or 2, characterized in that pumping perforation bridge plug combination is carried out after the fracturing operation in the last section of the day is completed, and then blowing operation is carried out at night under the condition of not throwing a bridge plug ball.
4. The single-well zipper-type fracturing gas testing construction method according to claim 1 or 2, characterized in that after the blowout operation at night is finished, the multi-stage fracturing operation at daytime is carried out after the bridge plug ball is put in.
5. The single-well zipper-type fracturing gas testing construction method according to claim 3, wherein the bridge plug is a soluble or insoluble bridge plug capable of meeting the bottom hole pressure bearing requirement of the blowout environment for more than 12 hours, and the bridge plug ball is a soluble ball.
6. The single well 'zip-type' fracturing gas testing construction method according to claim 1, characterized in that the proppant used in the later stage of fracturing is a film-coated proppant.
7. The single well 'zip-type' fracturing gas testing construction method according to claim 1, 2 or 6, characterized in that sand control fiber is added into the proppant used in the later stage of fracturing.
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| CN202210124599.4A CN114622887A (en) | 2022-02-10 | 2022-02-10 | Single-well zipper-type fracturing gas testing construction method |
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| CN202210124599.4A CN114622887A (en) | 2022-02-10 | 2022-02-10 | Single-well zipper-type fracturing gas testing construction method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103603644A (en) * | 2013-12-05 | 2014-02-26 | 中国石油集团川庆钻探工程有限公司 | Fracturing method of recyclable fracturing liquid for sandstone gas reservoir fracturing construction |
| CN103867177A (en) * | 2012-12-14 | 2014-06-18 | 中国石油天然气股份有限公司 | Horizontal well fracturing method |
| CN104649471A (en) * | 2014-12-31 | 2015-05-27 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Process for processing and recycling fracturing flow-back fluid |
| CN112696184A (en) * | 2021-03-24 | 2021-04-23 | 四川省威沃敦化工有限公司 | Fracturing construction method for oil and gas well |
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2022
- 2022-02-10 CN CN202210124599.4A patent/CN114622887A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103867177A (en) * | 2012-12-14 | 2014-06-18 | 中国石油天然气股份有限公司 | Horizontal well fracturing method |
| CN103603644A (en) * | 2013-12-05 | 2014-02-26 | 中国石油集团川庆钻探工程有限公司 | Fracturing method of recyclable fracturing liquid for sandstone gas reservoir fracturing construction |
| CN104649471A (en) * | 2014-12-31 | 2015-05-27 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Process for processing and recycling fracturing flow-back fluid |
| CN112696184A (en) * | 2021-03-24 | 2021-04-23 | 四川省威沃敦化工有限公司 | Fracturing construction method for oil and gas well |
Non-Patent Citations (2)
| Title |
|---|
| 宋永亭;袁长忠;张守献;吕永利;潘永强;汪卫东;: "滨37井工厂乳液缔合型压裂返排液回用处理技术应用", 钻采工艺, no. 01, 25 January 2017 (2017-01-25), pages 88 * |
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