CN114622886A - Cross fracturing gas testing construction method for well factory - Google Patents
Cross fracturing gas testing construction method for well factory Download PDFInfo
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- CN114622886A CN114622886A CN202210124597.5A CN202210124597A CN114622886A CN 114622886 A CN114622886 A CN 114622886A CN 202210124597 A CN202210124597 A CN 202210124597A CN 114622886 A CN114622886 A CN 114622886A
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- 238000012360 testing method Methods 0.000 title claims abstract description 21
- 238000010276 construction Methods 0.000 title claims abstract description 20
- 239000004576 sand Substances 0.000 claims description 14
- 238000005086 pumping Methods 0.000 claims description 8
- 239000000835 fiber Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 10
- 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 27
- 239000012530 fluid Substances 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 9
- 239000011159 matrix material Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 239000012736 aqueous medium Substances 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000003203 everyday effect Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000004458 analytical method Methods 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
- 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
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
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- 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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Abstract
The invention discloses a cross fracturing gas testing construction method for a well factory, which comprises the steps of synchronously fracturing and blowout of N wells, wherein in the fracturing period, the N wells alternately perform multi-section fracturing operation in the daytime and blowout operation at night, the N wells and the blowout operation are alternately performed, and the whole well blowout period is started after the multi-section fracturing operation is performed in the last day; wherein, during the fracturing operation of a certain well, the rest N-1 wells are subjected to open flow operation in the intermittent period of no fracturing operation in the daytime; and N is more than or equal to 2. 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 cross fracturing gas testing construction method for a well factory.
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 by fracture reformers, 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 the normal-pressure shale gas testing is low in formation pressure coefficient, large in fracturing scale, low in backflow after pressing, low in wellhead low pressure and low in yield, long in drainage and production period and the like, particularly the drainage and production process becomes a bottleneck technology of domestic shale gas development, and drainage and production processes 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, the toe end reservoir has almost no energy to naturally flow back 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 uniformly discharged after being pressed can generate high transportation and environmental protection cost under the condition of no return injection well; 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 cross fracturing gas testing construction method for the well factory, which is easy to operate, environment-friendly, energy-saving and emission-reducing, can effectively shorten the construction period, save the operation cost, and solve the problems of insufficient flow-back energy of a normal-pressure gas reservoir, serious damage to reservoir water and high treatment cost of single-well reverse drainage sewage.
The technical scheme comprises fracturing and open flow of N wells which are synchronously carried out, wherein in the fracturing period, the N wells alternately carry out multi-section fracturing operation in the daytime and open flow operation at night, the N wells and the open flow operation are alternately carried out, and the open flow period of the whole well is started after the multi-section fracturing operation is carried out in the last day; wherein, during the fracturing operation of a certain well, the rest N-1 wells are subjected to open flow operation in the intermittent period of no fracturing operation in the daytime; and N is more than or equal to 2.
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 ball is a soluble ball which can meet the bottom hole pressure-bearing requirement of the open-flow environment for more than 12 hours.
The proppant used in the later stage of fracturing is a coated proppant.
And adding sand control fibers into the proppant at the later stage of fracturing.
Aiming at the problems existing in the background technology, the inventor carries out deep analysis aiming at the mode that N wells simultaneously carry out fracturing test gas, and considering that when N wells share one set of fracturing equipment, the intermittent period of fracturing operation inevitably exists, so that the open flow operation is introduced in the intermittent period of the fracturing operation in daytime and at night every day, and the method has the following multiple technical effects: (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 the open flow operation at night in the same day can be directly prepared into fracturing fluid for the fracturing operation on the next day, so that the fracturing fluid is ingeniously recycled, the extraneous water consumed by the preparation of 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 is further reduced and the emission is 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 20 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 daytime 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 is a ball-throwing bridge plug, the bridge plug is soluble or insoluble and can meet the bottom hole pressure-bearing requirement of the blowout environment for more than 12 hours, the bridge plug ball can be a common bridge plug ball, and preferably a 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 the fracturing is preferably a coated proppant, sand control fibers are preferably added, resin films of the coated 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 coated proppant and the fiber network 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 not only can fully utilize the energy after pressing, improve the natural flowback rate, but also can timely reduce the fluid pressure difference between the crack and the matrix 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, and is suitable for normal-pressure shale gas reservoirs, and also suitable for reservoirs with high water sensitivity, such as dense gas reservoirs, coal bed gas reservoirs 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 following well is an example of two wells (referred to as well a and well B) simultaneously constructed by using a cross fracturing gas testing construction method of a well plant, and the present invention is further explained:
the method comprises a fracturing period and a blowout period, wherein in the fracturing period, a well A and a well B alternately perform multi-section fracturing operation in the daytime (namely, when the well A performs fracturing operation, the well B is in a discontinuous period), and perform blowout operation at night, wherein the well A and the well B alternately perform multi-section fracturing operation in the last day and then enter the blowout period of the whole well;
wherein, two wells carry out fracturing and open flow operation in turn daytime, namely well B just treats the intermittent period when well A carries out fracturing operation, carries out open flow operation.
And (4) performing multi-section fracturing operation and drilling a plug on the last day, wherein the two wells all enter the open flow period of the whole well, and when the yield is stable, the open flow period of the whole well 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 blowout environment for more than 12 hours, the bridge plug ball is preferably a soluble ball, and the smoothness of the whole shaft is guaranteed as much as possible during blowout.
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, sand control fibers can be added into the proppant at the later stage of fracturing so as to reduce the sand blowout. 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 cross fracturing gas testing construction method for a well factory comprises fracturing and blowout of N wells which are synchronously performed, and is characterized in that during a fracturing period, the N wells alternately perform multi-section fracturing operation in the daytime and blowout operation at night, the N wells and the blowout operation are alternately performed, and a full well blowout period is started after multi-section fracturing operation is performed on the last day; wherein, during the fracturing operation of a certain well, the rest N-1 wells are subjected to open flow operation in the intermittent period of no fracturing operation in the daytime; and N is more than or equal to 2.
2. The cross fracturing gas testing construction method of a well factory as claimed in 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 well factory cross fracturing gas testing construction method according to claim 1 or 2, characterized in that pumping perforation bridge plug combination is carried out after the last stage of fracturing operation in 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 well factory cross fracturing gas testing construction method according to claim 1 or 2, characterized in that after the blowout operation at night is finished, the bridge plug ball is put in and then the multistage fracturing operation at day is carried out.
5. The well factory cross fracturing gas testing construction method as claimed in claim 3, wherein said bridge plug ball is a soluble ball which can meet the bottom hole pressure bearing requirement of the blowout environment for more than 12 h.
6. The well factory cross fracturing gas testing construction method according to claim 1, wherein the proppant used in the later stage of fracturing is a coated proppant.
7. The well factory cross-fracturing gas testing construction method according to claim 1, 2 or 6, wherein sand control fibers are added to the proppant at the later stage of fracturing.
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| CN202210124597.5A CN114622886A (en) | 2022-02-10 | 2022-02-10 | Cross fracturing gas testing construction method for well factory |
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| CN202210124597.5A CN114622886A (en) | 2022-02-10 | 2022-02-10 | Cross fracturing gas testing construction method for well factory |
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| 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 |
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| CN112576230A (en) * | 2020-12-24 | 2021-03-30 | 华鼎鸿基石油工程技术(北京)有限公司 | Perforation fracturing gun and hydraulic sand blasting perforation bridge plug combined fracturing string |
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-
2022
- 2022-02-10 CN CN202210124597.5A patent/CN114622886A/en active Pending
Patent Citations (6)
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Non-Patent Citations (2)
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