CN111980641B - Low-permeability thick sand body close cutting fracturing method - Google Patents
Low-permeability thick sand body close cutting fracturing method Download PDFInfo
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- CN111980641B CN111980641B CN202010788222.XA CN202010788222A CN111980641B CN 111980641 B CN111980641 B CN 111980641B CN 202010788222 A CN202010788222 A CN 202010788222A CN 111980641 B CN111980641 B CN 111980641B
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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
- E21B43/14—Obtaining from a multiple-zone well
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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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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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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- 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
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Abstract
The application provides a low-permeability thick sand body close cutting fracturing method, and belongs to the field of petroleum exploration and development. It is according to oil deposit, reservoir characteristics, changes the single artificial fracture that conventional fracturing formed into and forms many independent fractures, fully cuts the sand body, enlarges artificial fracture and the effective area of contact who contains oil sand body: optimizing the spatial layout of each preset independent artificial fracture, designing different artificial fracture flow conductivity to improve the seepage effect, and finally increasing the effective transformation volume by adopting a differential fracture form to realize a close cutting process of a low-permeability thick oil layer. The process has high success rate, and can effectively improve the exploitation efficiency of the low-permeability thick sand body.
Description
Technical Field
The application relates to the field of petroleum exploration and development, in particular to a low-permeability thick sand body close cutting fracturing method.
Background
The effective thickness of the low-permeability thick sand reservoir is large, although the conventional fracturing process technology can form an artificial fracture with high flow conductivity in a perforation zone area, the artificial fracture is limited by reservoir characteristics, the longitudinal extension degree of the artificial fracture is low, the whole thick sand body is not fully transformed, the sand adding strength per meter is low, the transformation volume is limited, and the reservoir is unevenly used. A new method is urgently needed to improve the transformation volume of the low-permeability thick sand body so as to achieve the purpose of increasing the yield.
Disclosure of Invention
One of the purposes of the application is to provide a low-permeability thick sand body close-cut fracturing method, aiming at solving the problem that the existing low-permeability thick sand body oil reservoir is low in development yield.
The technical scheme of the application is as follows:
a low-permeability thick sand body intimate fracture method comprises the following steps:
selecting a measure layer position to be subjected to close fracture by using a well logging curve GR value, a well logging curve SP value and a stress difference value between a reservoir and an interlayer;
designing the fracture shape of the measure layer, wherein the fracture shape of the measure layer comprises the design of fracture length, fracture height and fracture spacing;
and step three, respectively packing the measure intervals of different measure layers, and sequentially carrying out pump injection construction on the measure intervals of each measure layer, wherein the pump injection construction of the measure intervals of the measure layers comprises construction of a pad fluid stage, construction of a fracturing sand-carrying fluid stage and construction of a fracturing displacing fluid stage.
As a technical scheme of the application, in the first step, the numerical range of a well logging curve GR of the measure layer is more than or equal to 60 and less than or equal to 75, the numerical range of a well logging curve SP of the measure layer is more than or equal to 60 and less than or equal to 65, and the range of the stress difference between a reservoir and an interlayer of the measure layer is more than or equal to 3MPa.
As a technical scheme of the application, in the second step, the fracture length of the fracturing fracture at the measure layer position is 90-110 m, the fracture height is 8-12 m, and the fracture distance is more than or equal to 1m.
As a technical scheme of the present application, in step three, the measure intervals of different measure horizons are separated by using a packer.
As a technical scheme of the application, in the third step, the fracturing fluid adopted in the construction of the pad fluid stage and the fracturing sand-carrying fluid stage of the measure interval of the measure layer position is cross-linked jelly, and the viscosity of the cross-linked jelly is 120-160mpa.s at the formation temperature of the measure interval of the measure layer position.
As a technical scheme of the application, the cross-linked jelly adopted in the preflush stage of the measure layer interval of the measure horizon is 1.2-1.4 m 3 The displacement of/min is alternately injected; the fracturing sand-carrying fluid stage of the measure layer section of the measure layer position is 1.6-1.8 m 3 And (3) pumping the cross-linked jelly according to the sand ratio of 15-55% by the discharge capacity per minute to finish the fracture supporting procedure.
As a technical solution of the present application, in step three, the thickening agent adopted by the fracturing fluid in the measure interval of the measure horizon is vegetable gum, a derivative of vegetable gum, cellulose, a derivative of cellulose, or a synthetic polymer.
As a technical solution of the present application, in step three, the fracturing displacement fluid stage of the measure interval of the measure horizon is replaced with active water or an uncrosslinked base fluid.
As a technical scheme of the application, in the third step, the size of the proppant adopted in the fracturing sand-carrying fluid stage of the measure interval of the measure horizon is 20-40 meshes.
As a technical scheme of this application, the proppant includes the quartz sand for fracturing, the compressive strength of proppant is greater than 50Mpa.
The beneficial effect of this application:
according to the low-permeability thick sand body close-cut fracturing method, a fracturing process with the purpose of conventional general crack creation is converted into close-cut fracturing by utilizing a ground stress system according to the characteristics of a low-permeability thick sand body reservoir. The method comprises the steps of selecting a measure interval to be subjected to close fracturing by utilizing a logging curve and a stress profile; according to the artificial fracture propagation form of the measure interval, uniformly fracturing and cutting the low-permeability thick sand reservoir to ensure that each fracture fully extends in the measure interval and a plurality of independent fractures are combined to further facilitate the enlargement of the oil drainage volume; the low-viscosity hydroxypropyl guar gum solution and quartz sand are adopted to fill artificial cracks, so that high flow conductivity of the cracks is realized, success of a fracturing process aiming at full transformation of low-permeability thick sand bodies is ensured, and the oil reservoir recovery rate is remarkably improved. The method has the advantages of simple related improvement method, high success rate, wide material source, strong universality, high safety and reliability, convenient operation and wide applicability, can obviously improve the fracturing yield-increasing effect, has important economic and social benefits, and has wide application prospect.
Detailed Description
In this application, unless expressly stated or limited otherwise, the first feature may be directly on or under the second feature or may include both the first and second features being in direct contact, but also the first and second features being in contact via another feature between them, not being in direct contact. Also, the first feature may be over, above or on the second feature including the first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being below, beneath or beneath a second feature includes the first feature being directly below and obliquely below the second feature or simply indicating that the first feature is at a lesser level than the second feature.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Example (b):
the application provides a low-permeability thick sand body close cutting fracturing method, which comprises the following steps: selecting a measure layer position to be subjected to close fracture by using a well logging curve GR value, a well logging curve SP value and a stress difference value between a reservoir and an interlayer; designing the fracture shape of the measure layer, wherein the fracture shape of the measure layer comprises the design of fracture length, fracture height and fracture spacing; and step three, respectively packing the measure intervals of different measure layers, and sequentially carrying out pump injection construction on the measure intervals of each measure layer, wherein the pump injection construction of the measure intervals of the measure layers comprises the construction of a pad fluid stage, the construction of a fracturing sand-carrying fluid stage and the construction of a fracturing displacing fluid stage.
It should be noted that, in the present embodiment, in the step one, the range of the value of the well log GR at the measure level is 60 ≤ GR ≤ 75, the range of the value of the well log SP at the measure level is 60 ≤ SP ≤ 65, and the range of the stress difference between the reservoir and the interlayer at the measure level is ≥ 3MPa.
In the second step, the fracture length of the fracturing fracture at the measure layer position is 90-110 m, the fracture height is 8-12 m, and the fracture distance is greater than or equal to 1m.
It should be noted that, in this embodiment, in step three, the measure intervals of different measure horizons are separated by using a packer.
It should be noted that, in the third step, the fracturing fluid used in the construction of the pad fluid stage and the fracturing sand-carrying fluid stage of the measure interval at the measure level is crosslinked gel, and the viscosity of the crosslinked gel is 120 to 160mpa.s at the formation temperature of the measure interval at the measure level.
It should be noted that, in this embodiment, the cross-linked gel used in the pad fluid stage of the measure interval of the measure horizon is 1.2-1.4 m 3 Displacement of/min is alternately injected; the fracturing sand-carrying fluid stage of the measure interval of the measure horizon is 1.6-1.8 m 3 The displacement of/min is to pump and inject the cross-linked jelly glue according to the sand ratio of 15-55 percent, thereby completing the fracture supporting procedure.
In this embodiment, in step three, the fracturing fluid in the measure interval of the measure horizon uses a thickening agent which is a plant gum, a derivative of the plant gum, cellulose, a derivative of the cellulose, or a synthetic polymer.
It should be noted that, in this embodiment, in step three, the fracturing displacement fluid stage of the measure interval of the measure horizon is displaced with active water or an uncrosslinked base fluid.
In this embodiment, in the third step, the size of the proppant used in the fracturing sand-carrying fluid stage of the measure interval of the measure horizon is 20 to 40 meshes. The proppant is quartz sand for fracturing, and the compressive strength of the proppant is greater than 50Mpa.
Now, the P83-832 well length 61 is taken as an example for specific explanation, and the construction design liquid volume is 120m 3 The designed discharge capacity is 1.4-1.8 m 3 The method comprises the following specific steps:
(1) Selecting a measure horizon: because the average value of the logging curve GR at the oil interval 1342.0-1344.0 m is 67, the average value of the logging curve SP is 63; the average value of a logging curve GR at an oil interval 1352.0-1355.0 m is 62, and the average value of a logging curve SP is 64; wherein the stress difference value between the interlayer section and the oil layer section is more than or equal to 3MPa. Therefore, the 1342.0-1344.0 m and 1352.0-1355.0 m sections are preferably perforated as the quasi-measure horizon.
(2) And (3) crack form design: the artificial cracks at the position of 1342.0-1344.0 m of the perforation layer position are formed by adopting a pad fluid of 12m 3 Sand amount 10m 3 Discharge capacity of 1.4m 3 The effective supporting seam length is 112m and the sand seam height is 8m (the vertical depth is 1342.0-1349.0 m) through designing per minute; the artificial fractures at the positions of 1352.0-1355.0 m of perforation layer are treated by using pad fluid of 8m 3 Sand amount 10m 3 And the discharge capacity is 1.6-1.8 m 3 The effective supporting seam length is 88m and the sand seam height is 12m (the vertical depth is 1350.0-1355.0 m) are designed by min; the designed fracture form can fully improve the low-permeability thick sand body.
(3) And (3) pumping: firstly, press the length of the sleeve to be 1.6m 3 The gel is injected into 1352.0-1355.0 m measure intervals at a delivery rate of/min, pumping is carried out according to the condition that the gel carries 15-55% of propping agent, and the artificial fracture filling procedure of the measure intervals is finished; after the first layer of construction is finished, throwing the ball, closing the gate, 30min later, waiting for the ball to return, pressing to stop the sliding sleeve, and strikingOpening a pressure guide sand blower to prepare for a second layer of pumping stage; according to 1.4m 3 Permin displacement, injecting jelly into the measure interval of 1342.0-1344.0 m, and carrying out pumping according to the condition that 15-55% of propping agent is carried by the jelly, thereby completing the process of filling artificial cracks in the measure interval.
(4) And (3) fracturing a displacement fluid stage: and (4) adopting active water for replacement, and calculating the using amount of the replacement fluid according to the lower depth volume of the oil well measure pipe column.
In this example, the pumping procedure for the different measure intervals is shown in tables 1 and 2.
TABLE 1 table 1352.0-1355.0 m pump injection schedule
The results show that the close cutting fracturing method adopted by the application can fully reform the thick sand body by reasonably designing the fracture form by utilizing the optimized measure layer section, and can improve the sand adding strength to 2.1m 3 And/m, the success rate is 100%, and the daily yield of the well after pressing is 3.6t.
In conclusion, according to the characteristics of the low-permeability thick sand reservoir, the low-permeability thick sand tight-cutting fracturing method converts the conventional fracturing process aiming at the general crack creation into the tight-cutting fracturing by utilizing a ground stress system. It utilizes the logging curve and stress profile,
TABLE 2 1342.0-1344.0 m pump injection schedule
Selecting a measure interval to be subjected to close fracture cutting; according to the artificial fracture expansion form of the measure interval, uniform fracturing and cutting are carried out on the low-permeability thick sand reservoir, so that each fracture is fully extended in the measure interval, and a plurality of independent fractures are combined to further facilitate the expansion of the oil drainage volume; the low-viscosity hydroxypropyl guar gum solution and quartz sand are adopted to fill artificial cracks, so that high flow conductivity of the cracks is realized, success of a fracturing process aiming at full transformation of low-permeability thick sand bodies is ensured, and the oil reservoir recovery rate is remarkably improved. The method has the advantages of simple related improvement method, high success rate, wide material source, strong universality, high safety and reliability, convenient operation and wide applicability, can obviously improve the fracturing yield-increasing effect, has important economic and social benefits, and has wide application prospect.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (8)
1. A low-permeability thick sand body close cutting fracturing method is characterized by comprising the following steps:
selecting a measure layer position to be subjected to close fracture by using a well logging curve GR value, a well logging curve SP value and a stress difference value between a reservoir and an interlayer;
designing the fracturing morphology of the measure layer, wherein the fracturing morphology of the measure layer comprises fracture length, fracture height and fracture spacing;
step three, respectively packing the measure intervals of different measure layers, and sequentially carrying out pump injection construction on the measure intervals of each measure layer, wherein the pump injection construction of the measure intervals of the measure layers comprises construction of a pad fluid stage, construction of a fracturing sand-carrying fluid stage and construction of a fracturing displacing fluid stage;
in the third step, the fracturing fluid adopted in the construction of the pad fluid stage and the fracturing sand-carrying fluid stage of the measure interval of the measure horizon is cross-linked jelly, and the viscosity of the cross-linked jelly is 120-160mpa.s at the formation temperature of the measure interval of the measure horizon;
in the third step, the cross-linked jelly is adopted according to the size of 1.2-1.4 m in the construction of the pad fluid stage of the measure layer section of the measure layer position 3 Displacement injection per min; fracturing sand-carrying fluid stage of the measure interval of the measure horizonIn the construction of (1.6-1.8 m) 3 And (3) pumping the cross-linked jelly according to the sand ratio of 15-55% by the discharge capacity per minute to finish the fracture supporting procedure.
2. The tight-cut fracturing method of low-permeability thick sand bodies according to claim 1, wherein in step one, the GR value of the well logging curve of the measure layer is 60-75, SP value of the well logging curve of the measure layer is 60-65, and the stress difference value between the reservoir and the interlayer of the measure layer is more than or equal to 3MPa.
3. The tight-cutting fracturing method of the low-permeability thick sand body according to claim 1, wherein in the second step, the fracture length of the fracturing fracture at the measure layer position is 90-110 m, the fracture height is 8-12 m, and the fracture spacing is more than or equal to 1m.
4. The method of claim 1, wherein in step three, the measure intervals of different measure horizons are separated by a packer.
5. The method for low-permeability thick sand body intimate-fracture fracturing, according to claim 1, wherein in step three, the fracturing fluid used in the measure interval of the measure horizon uses a thickening agent selected from the group consisting of plant gum, derivatives of plant gum, cellulose, derivatives of cellulose, and synthetic polymers.
6. The method of claim 1, wherein in step three, active water or an uncrosslinked base fluid is used for replacing the fracturing fluid phase of the measure interval of the measure horizon.
7. The tight-cutting fracturing method for the low-permeability thick sand body according to claim 1, wherein in the third step, the corresponding size of the proppant adopted in the construction of the fracturing sand-carrying fluid stage of the measure interval of the measure horizon is 20-40 meshes.
8. The method of claim 7, wherein the proppant comprises quartz sand for fracturing, and the proppant has a compressive strength greater than 50Mpa.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5964289A (en) * | 1997-01-14 | 1999-10-12 | Hill; Gilman A. | Multiple zone well completion method and apparatus |
| CN107965305A (en) * | 2016-10-20 | 2018-04-27 | 中国石油化工股份有限公司 | One kind layering refracturing method |
| CN110344807A (en) * | 2018-04-02 | 2019-10-18 | 中国石油化工股份有限公司 | Improve the fracturing process of the comprehensive sand ratio of Low permeable oil and gas reservoirs pressure break |
| CN110578506A (en) * | 2019-09-20 | 2019-12-17 | 中国石油天然气股份有限公司西南油气田分公司页岩气研究院 | A Completion Method of Volumetric Fracturing for Horizontal Wells in Unconventional Reservoirs |
| CN111322050A (en) * | 2020-04-24 | 2020-06-23 | 西南石油大学 | Shale horizontal well section internal osculating temporary plugging fracturing construction optimization method |
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2020
- 2020-08-07 CN CN202010788222.XA patent/CN111980641B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5964289A (en) * | 1997-01-14 | 1999-10-12 | Hill; Gilman A. | Multiple zone well completion method and apparatus |
| CN107965305A (en) * | 2016-10-20 | 2018-04-27 | 中国石油化工股份有限公司 | One kind layering refracturing method |
| CN110344807A (en) * | 2018-04-02 | 2019-10-18 | 中国石油化工股份有限公司 | Improve the fracturing process of the comprehensive sand ratio of Low permeable oil and gas reservoirs pressure break |
| CN110578506A (en) * | 2019-09-20 | 2019-12-17 | 中国石油天然气股份有限公司西南油气田分公司页岩气研究院 | A Completion Method of Volumetric Fracturing for Horizontal Wells in Unconventional Reservoirs |
| CN111322050A (en) * | 2020-04-24 | 2020-06-23 | 西南石油大学 | Shale horizontal well section internal osculating temporary plugging fracturing construction optimization method |
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