CN109630086A - A kind of energization refracturing process for old well - Google Patents
A kind of energization refracturing process for old well Download PDFInfo
- Publication number
- CN109630086A CN109630086A CN201811221044.1A CN201811221044A CN109630086A CN 109630086 A CN109630086 A CN 109630086A CN 201811221044 A CN201811221044 A CN 201811221044A CN 109630086 A CN109630086 A CN 109630086A
- Authority
- CN
- China
- Prior art keywords
- stratum
- refracturing
- energization
- old
- well
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000008569 process Effects 0.000 title claims abstract description 20
- 239000012530 fluid Substances 0.000 claims abstract description 44
- 238000002347 injection Methods 0.000 claims abstract description 22
- 239000007924 injection Substances 0.000 claims abstract description 22
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 238000003776 cleavage reaction Methods 0.000 claims abstract description 4
- 230000007017 scission Effects 0.000 claims abstract description 4
- 230000007423 decrease Effects 0.000 claims abstract description 3
- 239000004094 surface-active agent Substances 0.000 claims description 4
- 239000012752 auxiliary agent Substances 0.000 claims description 3
- 125000004836 hexamethylene group Chemical group [H]C([H])([*:2])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[*:1] 0.000 claims description 3
- 239000003129 oil well Substances 0.000 claims description 2
- 241000209094 Oryza Species 0.000 claims 2
- 235000007164 Oryza sativa Nutrition 0.000 claims 2
- 235000009566 rice Nutrition 0.000 claims 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 6
- 239000013589 supplement Substances 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 239000000835 fiber Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 230000008685 targeting Effects 0.000 description 1
Classifications
-
- 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
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The present invention discloses a kind of energization refracturing process for old well, comprising the following steps: nano fluid is injected into stratum with high discharge capacity, and injection pressure is lower than stratum cleavage fracture stress；Diverting agent is injected into the stratum, blocks the old crack in stratum；To fracturing fluid and proppant is injected in the stratum, the stratum is made to form new fracture network, then carries out refracturing operation；Bored well after the completion of refracturing operation, the opening well and making production after bottom pressure decline.The present invention can enter stratum by first injecting a large amount of nano fluids, then block original old crack in refracturing, and reduction liquid returns row and leads, and improve stratum injection water retaining in reservoir, and then supplement stratum energy, improve yield.
Description
Technical field
The invention belongs to oil fracturing fields, are related to a kind of energization refracturing process for old well.
Background technique
After long-term production, stratum energy decaying, strata pressure declines oil/gas well.Remaining oil digging is carried out to old filed
Potential is enough effectively improved oil and gas production, improves the economic benefit of old well.
New seam net can be formed in reservoir by carrying out refracturing operation to old well, increase reservoir reconstruction volume, be reduced
Filtrational resistance, and then improve oil and gas production.But refracturing not can effectively solve the problem of stratum energy failure；And
For the oil/gas well of stratum energy failure, the mode for generalling use water filling supplements stratum energy, due to the fluid injection efficiency of water injection well
Low, discharge capacity is small, slow to stratum energy supplement.
Summary of the invention
The purpose of the present invention is to provide a kind of energization refracturing process for old well, this method can be in weight
When multiple pressure break, enter stratum by first injecting a large amount of nano fluids, then block original old crack, reduction liquid returns row and leads, and improves
Stratum injection water retaining in reservoir, and then stratum energy is supplemented, improve yield.
The technical scheme of the present invention is realized as follows: a kind of energization refracturing process for old well, including
Following steps:
Step S10, nano fluid is injected into stratum with high discharge capacity, and injection pressure is lower than stratum cleavage fracture stress；
Step S20, diverting agent is injected in the stratum Xiang Suoshu, blocks the old crack in stratum；
Step S30, to fracturing fluid and proppant is injected in the stratum, the stratum is made to form new fracture network, so
Refracturing operation is carried out afterwards；
Step S40, bored well after the completion of refracturing operation, the opening well and making production after bottom pressure decline.
Further technical solution is that the nano fluid consists of the following mass percentage components: surfactant 5%
~50%, auxiliary agent 5%~50%, hexamethylene 5%~20%.
Further technical solution is that the injection rate of nano fluid is equal to the accumulative total fluid production of oil well in the step S10.
Further technical solution is, the discharge capacity of the nano fluid be greater than 5 sides/point.
Further technical solution is that diverting agent is pumped using low discharge capacity in the step S20, prevents from temporarily blocking up under high discharge capacity
Agent causes to block in pit shaft.
Further technical solution is the detailed process of the step S30 are as follows: carries out reperforation work to the stratum
Industry forms new perforation cluster, then fracturing fluid and proppant are injected into perforation cluster, and the stratum is made to form further technical side
Case is that original perforation cluster is avoided in above-mentioned reperforation position, and is uniformly distributed along pit shaft direction.
Further technical solution is can to terminate stewing well in the step S40 when bottom pressure meets following condition:
In formula: p1To press bottom pressure when preceding fluid injection；pwTo survey bottom pressure, p when stewing welleTo press preceding strata pressure.
Compared with prior art, the present invention having following remarkable result: old by what is had before refracturing to formation crude
The nano fluid containing nano particle and surfactant is injected in crack, and old crack is blocked using diverting agent targeting, is effectively reduced
The row of returning of liquid leads in old crack, improves the injection water retaining in reservoir in old crack, boils in a covered pot over a slow fire well by long-time and makes the nano fluid in old crack
Into in stratum, the failure due to well stratum energy old after exploiting for a long time is compensated for a certain extent, improves strata pressure, together
When, nano fluid, which enters, displaces oil gas in formation pore, improve the oil and gas production and recovery ratio of old well.
Specific embodiment
Further detailed description is done to the present invention below with reference to embodiment.
Embodiment 1
A kind of energization refracturing process for old well of the invention, comprising the following steps:
(1) tripping in downhole optic fiber: along pit shaft by oil pipe tripping in downhole optic fiber, sound wave and temperature sensor is installed, are used for
Along the temperature and pressure variable signal of pit shaft when monitoring pressure break fluid injection, passes through down-hole pressure table and record bottom pressure；
(2) infuse nano fluid: the nano fluid consists of the following mass percentage components: surfactant 5%~
50%, auxiliary agent 5%~50%, hexamethylene 5%~20% pass through oil pipe fluid injection into stratum with high discharge capacity, it is ensured that injection pressure
Lower than stratum cleavage fracture stress, the flow direction of liquid is judged according to the variation of temperature and pressure signal, the position in old crack is determined, under
The construction of one step provides foundation；
It is injected when wherein injecting nano fluid using high discharge capacity, 5 side of discharge capacity >/point, the injection rate of nano fluid is 30,000 side~5
Incomparably；
(3) according to the understanding of fracture geometry early period, the preferably diverting agent of appropriate particle size；
(4) diverting agent is injected to stratum, blocks old crack, which, which can enter, forms envelope of building bridge in target crack
Stifled, interior fluid and wellbore fluids are stitched in isolation, it is ensured that the nano fluid injected in advance is retained in old crack, reduces the row of returning of liquid
Rate improves the injection water retaining in reservoir on stratum；
(5) fracturing fluid proppant and diverting agent, the fracture network of new Cheng Xin are injected into stratum；
(6) refracturing construction is designed according to pressing crack construction, prepares fracturing unit and fracturing fluid and diverting agent, as required into
The construction of row refracturing；
(7) it boils in a covered pot over a slow fire well: after refracturing is constructed, implementing stewing well operation, bottom pressure value is measured by bottom pressure table,
It can terminate stewing well when bottom pressure meets following condition, opening well and making production after bored well:
In formula: p1To press bottom pressure when preceding fluid injection；pwTo survey bottom pressure, p when stewing welleTo press preceding strata pressure.
Embodiment 2
A kind of energization refracturing process for old well of the invention, comprising the following steps:
Nano fluid is injected into stratum in step 101, fracturing process；Injection nano fluid is to enter in stratum and had
Crack, do not need to press off new crack, bottom pressure therefore, in work progress should be kept lower than formation fracture pressure；
Wherein, high discharge capacity can be used when injecting nano fluid to inject, 5 side of discharge capacity >/point, the injected slurry volume of nano fluid is equal to oil
Accumulative Liquid output in well production process early period, general reservoir quantity are 30,000 sides~50,000 sides.
Step 102 is pumped using low discharge capacity into stratum and injects diverting agent, and the old crack in stratum is blocked；Wherein use
Low discharge capacity pumping, prevents diverting agent under high discharge capacity from causing to block in pit shaft；
As described above, the average grain diameter and concentration of diverting agent should roots when injection diverting agent blocks the old crack in stratum
It is optimized according to crack slit width, to guarantee that it can effectively block old crack.
Step 103 carries out reperforation along pit shaft, forms new perforation cluster；
As described above, carrying out reperforation along pit shaft, increase fracture initiation point, to press off new seam in subsequent stratum again,
New perforation cluster should quantity it is as more as possible, cluster spacing is small, more shower holes is formed in pit shaft, the position of perforation and quantity can roots
According to the case where first perforation and formation condition is designed, perforation can be used that perforating gun carries out perforating job or hydraulic sand blasting is penetrated
The modes such as hole；
Step 104 injects fracturing fluid proppant and diverting agent, the fracture network of new Cheng Xin, for this into new perforation cluster
The pressure break in the kind more shower holes of long horizontal sections can be used general pressure break and temporarily stifled mode combined to construct；
Stewing well after the completion of step 105, refracturing operation, the opening well and making production after bottom pressure meets the following conditions:
In formula: p1To press bottom pressure when preceding fluid injection；pwTo survey bottom pressure, p when stewing welleTo press preceding strata pressure.
In conclusion energization refracturing method provided in this embodiment, by being arranged greatly into old well in fracturing process
Amount injection nano fluid, enters nano fluid in the existing crack in stratum, old crack is blocked by diverting agent, in refracturing operation
Stewing well is carried out after the completion, is made nano fluid completely into formation pore, is supplemented stratum energy, meanwhile, nano fluid can reduce grease
Interfacial tension changes wettability of rock surface, oil gas displacement efficiency is improved, to improve reservoir recovery.
The above is not intended to limit the present invention in any form, although the present invention takes off through the foregoing embodiment
Show, however, it is not intended to limit the invention, any person skilled in the art, is not departing from technical solution of the present invention range
It is interior, made when the technology contents using the disclosure above and change or be modified to the equivalent embodiments of equivalent variations a bit, but it is all not
Be detached from technical solution of the present invention content, according to the technical essence of the invention it is to the above embodiments it is any it is simple modification,
Equivalent variations and modification, all of which are still within the scope of the technical scheme of the invention.
Claims (8)
1. a kind of energization refracturing process for old well, which comprises the following steps:
Step S10, nano fluid is injected into stratum with high discharge capacity, and injection pressure is lower than stratum cleavage fracture stress；
Step S20, diverting agent is injected in the stratum Xiang Suoshu, blocks the old crack in stratum；
Step S30, to fracturing fluid and proppant is injected in the stratum, the stratum is made to form new fracture network, then into
Row refracturing operation；
Step S40, bored well after the completion of refracturing operation, the opening well and making production after bottom pressure decline.
2. a kind of energization refracturing process for old well according to claim 1, which is characterized in that described to receive
Rice liquid consists of the following mass percentage components: surfactant 5%~50%, auxiliary agent 5%~50%, hexamethylene 5%~
20%.
3. a kind of energization refracturing process for old well according to claim 1, which is characterized in that the step
The injection rate of nano fluid is equal to the accumulative total fluid production of oil well in rapid S10.
4. a kind of energization refracturing process for old well according to claim 3, which is characterized in that described to receive
Rice liquid discharge capacity be greater than 5 sides/point.
5. a kind of energization refracturing process for old well according to claim 1, which is characterized in that the step
Diverting agent is pumped using low discharge capacity in rapid S20, prevents diverting agent under high discharge capacity from causing to block in pit shaft.
6. a kind of energization refracturing process for old well according to claim 5, which is characterized in that the step
The detailed process of rapid S30 are as follows: reperforation operation is carried out to the stratum, forms new perforation cluster, then inject into perforation cluster
Fracturing fluid and proppant make the stratum form new fracture network.
7. a kind of energization refracturing process for old well according to claim 6, which is characterized in that above-mentioned two
Secondary perforating site avoids original perforation cluster, and is uniformly distributed along pit shaft direction.
8. a kind of energization refracturing process for old well according to claim 1, which is characterized in that the step
It can terminate stewing well in rapid S40 when bottom pressure meets following condition:
In formula: p1To press bottom pressure when preceding fluid injection；pwTo survey bottom pressure, p when stewing welleTo press preceding strata pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811221044.1A CN109630086A (en) | 2018-10-19 | 2018-10-19 | A kind of energization refracturing process for old well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811221044.1A CN109630086A (en) | 2018-10-19 | 2018-10-19 | A kind of energization refracturing process for old well |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109630086A true CN109630086A (en) | 2019-04-16 |
Family
ID=66066446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811221044.1A Pending CN109630086A (en) | 2018-10-19 | 2018-10-19 | A kind of energization refracturing process for old well |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109630086A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112901110A (en) * | 2021-01-23 | 2021-06-04 | 长安大学 | Method for temporary blocking diversion fracturing by salinity response type emulsion |
| CN113187456A (en) * | 2021-05-13 | 2021-07-30 | 捷贝通石油技术集团股份有限公司 | Process flow for old well energizing group repeated fracturing |
| CN114320250A (en) * | 2020-10-09 | 2022-04-12 | 中国石油天然气股份有限公司 | Fracturing and imbibition method for low-permeability reservoir |
| CN114790882A (en) * | 2022-04-29 | 2022-07-26 | 中国石油大学(北京) | Repeated fracturing production method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104419396A (en) * | 2013-08-23 | 2015-03-18 | 中国石油天然气股份有限公司 | Nano composite fracturing fluid and preparation method and application thereof |
| CN105134158A (en) * | 2015-08-26 | 2015-12-09 | 中国石油天然气股份有限公司 | Fracturing method for supplementing stratum energy of compact oil reservoir |
| CN105507865A (en) * | 2014-09-22 | 2016-04-20 | 中国石油化工股份有限公司 | Re-fracturing method for oil, gas and water wells |
| CN105927198A (en) * | 2016-04-27 | 2016-09-07 | 中国石油天然气股份有限公司 | Energy supplementing and fracturing yield increasing integrated repeated transformation method for old well of tight oil reservoir |
| CN105952430A (en) * | 2016-06-07 | 2016-09-21 | 中国石油天然气股份有限公司 | Compact oil reservoir low-yield horizontal well volume fracturing energy supplementing method |
| CN106246150A (en) * | 2016-09-18 | 2016-12-21 | 中国石油天然气股份有限公司 | Oil field fracturing transformation method |
-
2018
- 2018-10-19 CN CN201811221044.1A patent/CN109630086A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104419396A (en) * | 2013-08-23 | 2015-03-18 | 中国石油天然气股份有限公司 | Nano composite fracturing fluid and preparation method and application thereof |
| CN105507865A (en) * | 2014-09-22 | 2016-04-20 | 中国石油化工股份有限公司 | Re-fracturing method for oil, gas and water wells |
| CN105134158A (en) * | 2015-08-26 | 2015-12-09 | 中国石油天然气股份有限公司 | Fracturing method for supplementing stratum energy of compact oil reservoir |
| CN105927198A (en) * | 2016-04-27 | 2016-09-07 | 中国石油天然气股份有限公司 | Energy supplementing and fracturing yield increasing integrated repeated transformation method for old well of tight oil reservoir |
| CN105952430A (en) * | 2016-06-07 | 2016-09-21 | 中国石油天然气股份有限公司 | Compact oil reservoir low-yield horizontal well volume fracturing energy supplementing method |
| CN106246150A (en) * | 2016-09-18 | 2016-12-21 | 中国石油天然气股份有限公司 | Oil field fracturing transformation method |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114320250A (en) * | 2020-10-09 | 2022-04-12 | 中国石油天然气股份有限公司 | Fracturing and imbibition method for low-permeability reservoir |
| CN114320250B (en) * | 2020-10-09 | 2023-09-26 | 中国石油天然气股份有限公司 | Fracturing and imbibition method of hypotonic oil reservoir |
| CN112901110A (en) * | 2021-01-23 | 2021-06-04 | 长安大学 | Method for temporary blocking diversion fracturing by salinity response type emulsion |
| CN113187456A (en) * | 2021-05-13 | 2021-07-30 | 捷贝通石油技术集团股份有限公司 | Process flow for old well energizing group repeated fracturing |
| CN114790882A (en) * | 2022-04-29 | 2022-07-26 | 中国石油大学(北京) | Repeated fracturing production method |
| CN114790882B (en) * | 2022-04-29 | 2023-09-08 | 中国石油大学(北京) | Repeated fracturing production method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109113703B (en) | Fracturing method of deep shale gas V-shaped pressure curve | |
| CN103306660B (en) | A kind of method of shale gas reservoir fracturing volume increase | |
| CN105089596B (en) | Hydraulic fracturing transformation method for unconventional reservoir oil and gas well | |
| CN110761765B (en) | Volume fracturing method for activating natural fracture in large range | |
| CN107313762B (en) | Shale hydraulic fracturing method | |
| CN109630086A (en) | A kind of energization refracturing process for old well | |
| CN102022105B (en) | Large composite acid fracturing method of fracture cave type carbonate rock reservoir | |
| CN109931045B (en) | Self-supporting acid fracturing method of double-seam system | |
| CN109958411B (en) | Horizontal well cluster perforation staged fracturing method | |
| CN104790951B (en) | Weaken the method and device away from the high-order tight roofs of 100 ~ 350m of coal seam | |
| US20220127942A1 (en) | Volumetric fracturing method of temporarily plugging and diverting through functional slick water with oil displacement agent injected simultaneously | |
| CN107255027A (en) | A kind of carbonate reservoir is combined remodeling method | |
| CN106593389B (en) | Fracturing method for realizing high-angle natural fracture oil reservoir by adopting permanent plugging agent | |
| CN105545307A (en) | Method for over-pit and under-pit cooperative control of roofs of far and near fields of extra-large stoping space | |
| US10458220B2 (en) | System and method for facilitating subterranean hydrocarbon extraction utilizing electrochemical reactions with metals | |
| CN101747886B (en) | Fracturing fluid stock solution, full-filling preposition-free sand adding fracturing method and fracturing fluid cross-linking solution thereof | |
| CN105089603A (en) | Reservoir transformation method for forming fracture network by temporary plugging and steering in fracture | |
| CN109751036B (en) | Method for delaying effective fracture reconstruction volume decrement of deep shale gas | |
| CN103437746A (en) | Volume fracturing method for multiple cracks in multiple sections of horizontal well | |
| CN103967470B (en) | A kind of horizontal well mud stone wears lamination cracking method | |
| CN101457640A (en) | Abradant jet downhole perforation, kerf multiple fracturing method and device | |
| CN206860155U (en) | Coal-series gas U-shaped well drilling and fracturing structure | |
| CN110159239B (en) | Vertical well large-scale hydraulic fracturing oil jacket co-injection fracturing method | |
| CN110259421A (en) | Fractured compact oil reservoir water injection energy supplementing method | |
| CN105443100A (en) | Fracturing method for controlling seam height by fixed-face perforation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190416 |