CN111022018A - Hydraulic fracturing method for reducing fracture pressure by fixed-point perforation - Google Patents
Hydraulic fracturing method for reducing fracture pressure by fixed-point perforation Download PDFInfo
- Publication number
- CN111022018A CN111022018A CN201911220478.4A CN201911220478A CN111022018A CN 111022018 A CN111022018 A CN 111022018A CN 201911220478 A CN201911220478 A CN 201911220478A CN 111022018 A CN111022018 A CN 111022018A
- Authority
- CN
- China
- Prior art keywords
- hydraulic fracturing
- perforation
- point
- group
- fixed
- 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
Images
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
- C09K8/68—Compositions based on water or polar solvents containing organic compounds
-
- 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
- E21B43/11—Perforators; Permeators
- E21B43/116—Gun or shaped-charge perforators
Abstract
The invention provides a hydraulic fracturing method for reducing fracture pressure by fixed-point perforation, which comprises the following specific steps: the perforating gun carries out multi-group fixed-point perforating, each group of perforating bullets are concentrated at one point, each group of perforating bullets form a stress crushing area in the stratum, so that the stratum fracture pressure is reduced, and then hydraulic fracturing is carried out on the reservoir stratum. The method is simple to operate, does not increase construction procedures and operation cost, can effectively reduce the formation fracture pressure, and is suitable for hydraulic fracturing operation of high-hardness and high-fracture reservoirs.
Description
Technical Field
The invention belongs to the field of oil and gas field exploration and development, particularly relates to a hydraulic fracturing technology, and discloses a hydraulic fracturing method for reducing fracturing through fixed-point perforation.
Background
In recent years, with the continuous development of exploration and development technologies, the development of low-permeability oil reservoirs and unconventional oil and gas resources is more and more emphasized. Hydraulic fracturing is also gaining increasing attention as a necessary means of low permeability reservoirs and unconventional reservoir reconstruction. Hydraulic fracturing is a method for enhancing the communication between a shaft and an oil reservoir (a production layer) and improving the yield of a single well by perforating and pumping liquid and proppant into a stratum to generate a channel with flow guiding capacity.
Then, because the low-permeability oil reservoir and the unconventional reservoir are compact in physical property and high in hardness, the hydraulic fracturing is difficult to break rock, and the hydraulic fracturing construction operation can be carried out only by effectively reducing the fracture pressure. The main methods for reducing the fracture pressure at present are: increasing perforation density and penetration depth, acid liquor treatment, high-energy gas fracturing treatment and the like. However, the existing means for reducing the burst pressure have the following main problems: firstly, the effect of reducing crushing pressure is not obvious; secondly, the construction process is increased; thirdly, the operating costs are increased.
The conventional perforation technology mainly aims at establishing a channel between an oil reservoir and a shaft, the perforation orientation is mainly spiral perforation, and several new perforation technologies are developed at present for achieving special purposes, such as: azimuthal (directional) perforation techniques to increase fracture complexity; fixed-surface perforating technology for controlling fracture extension; the hydraulic sand blasting perforation process is used for realizing perforation and fracturing combined operation. However, no related report of a method for reducing fracturing pressure by adopting a perforation technology or a similar technology is seen in China at present.
Therefore, the invention provides a hydraulic fracturing method for reducing fracture pressure by fixed-point perforation for the first time, a stress fracture area is generated in a stratum by the spatial combination of perforating bullets, and the fracture pressure of hydraulic fracturing is greatly reduced by matching with low viscous liquid fracture pressure.
Disclosure of Invention
In order to solve the problems of unobvious crushing reduction effect, complicated construction process and high operation cost in the prior art, the invention provides the hydraulic fracturing method for reducing crushing by fixed-point perforation. The method is simple to operate, does not increase construction procedures and operation cost, can effectively reduce the formation fracture pressure, is convenient to popularize on site, and is suitable for hydraulic fracturing operation of high-hardness and high-fracture storage layers.
The technical scheme adopted by the invention is as follows:
a hydraulic fracturing method for reducing fracture pressure by fixed-point perforation comprises the following specific steps: the perforating gun carries out multi-group fixed-point perforating, each group of perforating bullets are concentrated at one point, each group of perforating bullets form a stress crushing area in the stratum, so that the stratum fracture pressure is reduced, and then hydraulic fracturing is carried out on the reservoir stratum.
The multiple groups of fixed-point perforations are fire perforations, and the number of the perforations in each group is 3-4.
And the perforation thickness of each group of the plurality of groups of fixed-point perforations is 0.25-0.33 m.
The hydraulic fracturing of the reservoir is realized by adopting a low-viscosity fracturing fluid to carry out fracturing and then carrying out a subsequent fracturing procedure.
The low-viscosity fracturing fluid is active water or slickwater, and the viscosity of the low-viscosity fracturing fluid is lower than 2 mPa.s.
The active water comprises the following components in percentage by weight: 0.3-0.5 part of clay stabilizer, 0.3-0.5 part of cleanup additive and the balance of water.
The slippery water comprises the following components in percentage by weight: 0.3-0.5 part of clay stabilizer, 0.3-0.5 part of cleanup additive, 0.5-1.5 parts of resistance reducing agent and the balance of water.
The invention has the beneficial effects that:
the invention provides a hydraulic fracturing method for reducing fracturing pressure by fixed-point perforation for the first time. The perforating gun is used for carrying out multi-group fixed-point perforating, each group of perforating bullets are concentrated on one point, each group of perforating bullets form a stress crushing area in the stratum and are matched with low-viscosity liquid for crushing, and therefore the crushing pressure of the stratum is greatly reduced. The method is simple to operate, does not increase construction procedures and operation cost, can effectively reduce the formation fracture pressure, is convenient to popularize on site, and is suitable for hydraulic fracturing operation of high-hardness and high-fracture storage layers.
The following will be further described with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic illustration of a fixed-point perforation.
In the figures, the reference numbers are: 1. a wellbore; 2. a perforation trajectory.
Detailed Description
Example 1:
in order to solve the problems of unobvious crushing reduction effect, complicated construction process and high operation cost in the prior art, the invention provides the hydraulic fracturing method for reducing crushing by fixed-point perforation as shown in figure 1. The method is simple to operate, does not increase construction procedures and operation cost, can effectively reduce the formation fracture pressure, is convenient to popularize on site, and is suitable for hydraulic fracturing operation of high-hardness and high-fracture storage layers.
A hydraulic fracturing method for reducing fracture pressure by fixed-point perforation comprises the following specific steps: the perforating gun carries out multi-group fixed-point perforating, each group of perforating bullets are concentrated at one point, each group of perforating bullets form a stress crushing area in the stratum, so that the stratum fracture pressure is reduced, and then hydraulic fracturing is carried out on the reservoir stratum.
According to the invention, a perforating gun is utilized to carry out multi-group fixed-point perforation, each group of perforating bullets is concentrated at one point, each group of perforating bullets forms a stress crushing area in the stratum and is matched with low-viscosity liquid for crushing, so that the crushing pressure of the stratum is greatly reduced.
The method is simple to operate, does not increase construction procedures and operation cost, can effectively reduce the formation fracture pressure, is convenient to popularize on site, and is suitable for hydraulic fracturing operation of high-hardness and high-fracture storage layers.
Example 2:
based on the embodiment 1, in this embodiment, the plurality of groups of fixed-point perforations are fire perforations, and the number of perforations in each group is 3 to 4.
And the perforation thickness of each group of the plurality of groups of fixed-point perforations is 0.25-0.33 m.
The hydraulic fracturing of the reservoir is realized by adopting a low-viscosity fracturing fluid to carry out fracturing and then carrying out a subsequent fracturing procedure. The subsequent fracturing procedure is an existing conventional fracturing procedure. The present invention will not be described further.
The low-viscosity fracturing fluid is active water or slickwater, and the viscosity of the low-viscosity fracturing fluid is lower than 2 mPa.s.
The perforating gun carries out multi-group fixed-point perforating, each group of perforating bullets are concentrated at one point, and each group of perforating bullets form a stress crushing area in the stratum, so that the stratum fracture pressure is greatly reduced, and then the reservoir stratum is subjected to hydraulic fracturing.
As shown in fig. 1, a perforation track 2 is shown in a wellbore 1. The invention relates to a method for preparing a multilayer composite multilayer. The perforation thickness of each fixed point perforation group is 0.25-0.33m, the shooting thickness of 3 holes in the invention is 0.25m, and the shooting thickness of 4 holes is 0.33 m.
Further, the active water comprises the following components in percentage by weight: 0.3-0.5 part of clay stabilizer, 0.3-0.5 part of cleanup additive and the balance of water.
Further, the slickwater comprises the following components in percentage by weight: 0.3-0.5 part of clay stabilizer, 0.3-0.5 part of cleanup additive, 0.5-1.5 parts of resistance reducing agent and the balance of water.
The invention adopts active water and slickwater as low-viscosity fracturing fluid to carry out fracturing, effectively reduces the formation fracturing pressure, is convenient for field popularization, and is suitable for hydraulic fracturing operation of high-hardness and high-fracturing storage layers.
Example 3:
based on the embodiment 2, in the embodiment, the cable transmission is adopted to perform fixed-point perforation on the stratum, the perforation thickness is 4m, 16 groups of fixed-point perforations are formed, each group of perforations is 0.25m, and the number of the perforation holes of each group of perforating guns is 3; and then carrying out hydraulic fracturing, wherein the hydraulic fracturing adopts low-viscosity fracturing fluid for fracturing, and in the embodiment, the low-viscosity fracturing fluid adopts active water as pad fluid for fracturing the stratum. The viscosity of the active water is 1.3mPa.s, and the component ratio is as follows: 0.5 part of clay stabilizer, 0.5 part of cleanup additive and the balance of water. The hydraulic fracturing adopts low-viscosity fracturing fluid for fracturing, and other fracturing procedures are the same as those of the conventional fracturing process. The hydraulic fracturing will not be described in detail in the present invention. After the low-viscosity fracturing fluid is subjected to fracturing, the fracturing pressure of hydraulic fracturing is effectively reduced.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should fall within the protection scope of the invention. The method steps and the process which are not described in detail in the invention are all the prior art, and the description of the method steps and the process is not repeated.
Claims (7)
1. A hydraulic fracturing method for reducing fracture pressure by fixed-point perforation is characterized in that: the method comprises the following specific steps: the perforating gun carries out multi-group fixed-point perforating, each group of perforating bullets are concentrated at one point, each group of perforating bullets form a stress crushing area in the stratum, so that the stratum fracture pressure is reduced, and then hydraulic fracturing is carried out on the reservoir stratum.
2. The hydraulic fracturing method with site perforation and reduced fracture as claimed in claim 1, wherein: the multiple groups of fixed-point perforations are fire perforations, and the number of the perforations in each group is 3-4.
3. The hydraulic fracturing method with site perforation and reduced fracture as claimed in claim 1, wherein: and the perforation thickness of each group of the plurality of groups of fixed-point perforations is 0.25-0.33 m.
4. The hydraulic fracturing method with site perforation and reduced fracture as claimed in claim 1, wherein: the hydraulic fracturing of the reservoir is realized by adopting a low-viscosity fracturing fluid to carry out fracturing and then carrying out a subsequent fracturing procedure.
5. The hydraulic fracturing method with site perforation and fracture reduction of claim 4, wherein the method comprises the following steps: the low-viscosity fracturing fluid is active water or slickwater, and the viscosity of the low-viscosity fracturing fluid is lower than 2 mPa.s.
6. The hydraulic fracturing method with site perforation and reduced fracture as claimed in claim 5, wherein: the active water comprises the following components in percentage by weight: 0.3-0.5 part of clay stabilizer, 0.3-0.5 part of cleanup additive and the balance of water.
7. The hydraulic fracturing method with site perforation and reduced fracture as claimed in claim 6, wherein: the slippery water comprises the following components in percentage by weight: 0.3-0.5 part of clay stabilizer, 0.3-0.5 part of cleanup additive, 0.5-1.5 parts of resistance reducing agent and the balance of water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911220478.4A CN111022018A (en) | 2019-12-03 | 2019-12-03 | Hydraulic fracturing method for reducing fracture pressure by fixed-point perforation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911220478.4A CN111022018A (en) | 2019-12-03 | 2019-12-03 | Hydraulic fracturing method for reducing fracture pressure by fixed-point perforation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111022018A true CN111022018A (en) | 2020-04-17 |
Family
ID=70204075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911220478.4A Pending CN111022018A (en) | 2019-12-03 | 2019-12-03 | Hydraulic fracturing method for reducing fracture pressure by fixed-point perforation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111022018A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070158109A1 (en) * | 2006-01-11 | 2007-07-12 | Schlumberger Technology Corporation | Perforating Gun |
| CN103589416A (en) * | 2013-11-19 | 2014-02-19 | 中国石油天然气股份有限公司 | Low-friction recyclable slickwater fracturing fluid suitable for compact oil and gas reservoirs and preparation method thereof |
| CN106529074A (en) * | 2016-11-28 | 2017-03-22 | 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 | Hydraulic sandblasting fixed-point perforation mechanical parameter calculation model and application method |
| CN106761642A (en) * | 2016-12-21 | 2017-05-31 | 中国石油天然气股份有限公司 | A kind of straight well pinpoints multistage fracturing methods and applications |
| CN107420081A (en) * | 2017-09-08 | 2017-12-01 | 中国石油天然气股份有限公司 | A kind of fracturing process for realizing the effective partial pressure of fine and close heterogeneous reservoir |
| WO2018125056A1 (en) * | 2016-12-27 | 2018-07-05 | Halliburton Energy Services, Inc. | Strengthening proppant on-the-fly during hydraulic fracturing treatments |
| CN110359887A (en) * | 2018-04-11 | 2019-10-22 | 中国石油天然气股份有限公司 | Oil reservoir perforating methods and device |
-
2019
- 2019-12-03 CN CN201911220478.4A patent/CN111022018A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070158109A1 (en) * | 2006-01-11 | 2007-07-12 | Schlumberger Technology Corporation | Perforating Gun |
| CN103589416A (en) * | 2013-11-19 | 2014-02-19 | 中国石油天然气股份有限公司 | Low-friction recyclable slickwater fracturing fluid suitable for compact oil and gas reservoirs and preparation method thereof |
| CN106529074A (en) * | 2016-11-28 | 2017-03-22 | 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 | Hydraulic sandblasting fixed-point perforation mechanical parameter calculation model and application method |
| CN106761642A (en) * | 2016-12-21 | 2017-05-31 | 中国石油天然气股份有限公司 | A kind of straight well pinpoints multistage fracturing methods and applications |
| WO2018125056A1 (en) * | 2016-12-27 | 2018-07-05 | Halliburton Energy Services, Inc. | Strengthening proppant on-the-fly during hydraulic fracturing treatments |
| CN107420081A (en) * | 2017-09-08 | 2017-12-01 | 中国石油天然气股份有限公司 | A kind of fracturing process for realizing the effective partial pressure of fine and close heterogeneous reservoir |
| CN110359887A (en) * | 2018-04-11 | 2019-10-22 | 中国石油天然气股份有限公司 | Oil reservoir perforating methods and device |
Non-Patent Citations (2)
| Title |
|---|
| 尹建 等: "低渗透薄互层压裂技术研究及应用", 《天然气与石油》 * |
| 杜现飞 等: "薄互层定点多级脉冲式压裂技术研究", 《钻采工艺》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106567702B (en) | Method for improving complexity index of deep shale gas crack | |
| CN109838223B (en) | Deep complex shale gas volume fracturing method | |
| CN109751029B (en) | Deep shale gas fracturing method | |
| CN107965306B (en) | Acid injection fracturing method | |
| CN110984943B (en) | Limit clustering perforation fracturing method for long horizontal well of compact reservoir | |
| US10858923B2 (en) | Enhancing complex fracture networks in subterranean formations | |
| CN105822276B (en) | Interval while water injection oil extraction method between multistage fracturing horizontal well seam | |
| CN107806337A (en) | Shale gas reservoir horizontal well selectivity is by cluster fracturing technology | |
| CN110005388B (en) | Fracturing and yield increasing method for 3-inch semi-slim well side drilling of ultra-low permeability oil reservoir | |
| CN104847317A (en) | Method for raising recovery efficiency of super-deep low permeability heavy oil reservoir | |
| CN106761606A (en) | The asynchronous note CO of different well of symmetrical expression cloth seam2Oil production method | |
| CN112253066A (en) | Method for improving fracture complexity and transformation volume of deep shale gas | |
| CN108049859A (en) | A kind of method for realizing side tracked slim hole staged fracturing | |
| CN109488272A (en) | Hot dry rock vertical well cuts fracturing process | |
| CN109630086A (en) | A kind of energization refracturing process for old well | |
| CN105064968A (en) | Oil and gas well fixed-face perforation fracturing device for hydrofracture | |
| CN106593387A (en) | Sectional multi-cluster fracturing method of horizontal well | |
| CN111827954A (en) | Continuous pulse hydraulic fracturing system and method | |
| CN114059980B (en) | Shale reservoir fracturing method | |
| CN111022018A (en) | Hydraulic fracturing method for reducing fracture pressure by fixed-point perforation | |
| CN111663930B (en) | Fracturing method for horizontal seam of shallow tight oil reservoir | |
| CN108457634A (en) | Shale horizontal well cuts fracturing process and abradant jet cutting tool | |
| CN105041274A (en) | Short-range two-layer oil-gas reservoir commingled production technique | |
| CN112443305B (en) | Horizontal well fracturing method for promoting high fracture extension through twice acid injection and temporary plugging among clusters | |
| CN105715240B (en) | It is spaced water injection oil extraction method between multistage fracturing horizontal well seam |
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: 20200417 |