CN109505578B - Repeated fracturing method for realizing lateral residual oil potential excavation of crack of ultra-low permeability oil reservoir old well - Google Patents
Repeated fracturing method for realizing lateral residual oil potential excavation of crack of ultra-low permeability oil reservoir old well Download PDFInfo
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- 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
- E21B43/11—Perforators; Permeators
- E21B43/116—Gun or shaped-charge perforators
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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 invention discloses a repeated fracturing method for realizing lateral residual oil potential excavation of an ultra-low permeability oil reservoir old well, which comprises the following steps: 1) selecting a production well which is positioned on the lateral direction of the water flooding dominant direction, and preferably selecting a potential interval; 2) performing directional perforation on the potential interval and the distribution direction of the residual oil; 3) setting a double-seal fracturing string in the new perforation layer section; 4) performing acid fracturing and repeated fracturing continuous construction on the directional perforation layer section; 5) and closing the well, open-blowing and taking out the fracturing string for re-production. The method provided by the invention can form a new steering crack in the repeated fracturing process of the old oil field of the ultra-low permeability oil reservoir, and dig the residual oil on the lateral side of the hidden crack to achieve the purposes of controlling water and increasing oil.
Description
Technical Field
The invention relates to the field of oil extraction engineering, in particular to a repeated fracturing yield-increasing method for realizing the excavation of residual oil in the lateral direction of a crack by an ultra-low permeability reservoir old well.
Background
The ultra-low permeability sandstone reservoir represented by 6 long layers of Ansai oil field has the advantages that the development thickness of the longitudinal upper oil layer is large (15-20m), a plurality of small layers are developed in the layer, the development mode mainly comprising water injection and fracturing is mainly adopted, and the initial jetting degree is low (30% -40%). Due to the influence of reservoir heterogeneity and fracture extension after multiple measures, along with the prolonging of production time, the oil well with the upward fracture principal direction has a water drive dominant direction, so that the principal oil well can see water prematurely. Meanwhile, the core taking result of the encrypted inspection well shows that the water drive is greatly influenced by the physical properties of the reservoir and artificial fractures, and the water drive is not uniform. The plane is distributed in an irregular ellipse or strip shape, and the residual oil is mainly distributed in the lateral direction of the crack. In order to fully utilize the lateral residual oil of the old fracture, the primary methods in the early stage comprise two modes of temporary blocking and steering fracturing of the old well and lateral encryption or sidetracking of a waterline.
The existing lateral residual oil dredging method mainly has the following problems: firstly, the single temporary plugging agent in the joint has poor construction controllability, unsatisfactory temporary plugging and boosting effect and construction continuity, low success rate and difficult lateral joint formation; secondly, well arrangement is carried out in an encrypted manner, so that the influence on the yield decrease of the old well is large (the yield increase is decreased by more than 8% from the second year), and the single well productivity of the new well is low; thirdly, sidetracking is similar to an encrypted well, the procedure of drilling a new well is complex, the cost is high, and the difficulty of producing and maintaining a slim hole is large.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a repeated fracturing production-increasing method for realizing the potential excavation of residual oil in the lateral direction of a crack for an old well of an ultra-low permeability oil reservoir, which has the advantages of high success rate, high yield of a new well and low cost.
The invention mainly realizes controlling the crack initiation direction and forcing crack steering in the repeated fracturing of the oil well in the medium and high water-cut period in the sandstone thick oil reservoir with ultra-low permeability and interlayer development in the layer, and avoids the repeated fracturing crack from extending and expanding in the old crack, thereby realizing steering the residual oil area of the crack communication waterline side direction, forming a plurality of cracks on the oil well and promoting the lateral effect.
The invention is realized by the following technical scheme.
A repeated fracturing method for realizing lateral residual oil potential excavation of a fracture of an ultra-low permeability oil reservoir old well comprises the following steps:
s1, selecting a potential interval of the production well which is positioned in the lateral direction of the water flooding dominant direction;
s2, performing directional perforation on the potential interval and the distribution direction of the remaining oil;
s3, setting a double-seal fracturing string in the new perforation interval, and setting by hydraulic pressurization in the oil pipe in the fracturing process;
s4, carrying out acid fracturing and repeated fracturing continuous construction on the directional perforation interval;
and S5, closing the well, open-blowing and producing the fracturing string for recovery.
Preferably, in step S1, the water flooding dominant direction is consistent with the well row direction of the well pattern arrangement, i.e. the direction of the maximum horizontal principal stress of the reservoir.
Preferably, the water flooding dominant direction is an angle well row direction, the production well in the direction is communicated with the water injection well at the later stage to form a waterline, and the potential well is a side well lateral to the waterline;
the potential interval is a low-permeability layer non-perforated well section with interlayer development, and the interlayer thickness between the potential interval and the original perforated section is more than 2-3 m.
Preferably, in step S2, the directional perforation method is a cable transmission directional perforation method, and the perforation direction is perpendicular to the well row direction; the perforating gun phase is 180 degrees.
Preferably, if double-wing symmetrical cracks are formed on two sides of the waterline, the bullets are loaded in the directions of the two sides and simultaneously perforated; if a single-wing fracture is made only on one side of the waterline, only the charge holes need to be installed in the same side direction.
Preferably, in step S3, the double-seal fracturing string includes a ball seat, a K344 packer, a pressure-guiding sand blower, an oil pipe adjusting nipple, a K344 packer and a hydraulic anchor which are connected in sequence from bottom to top in a casing running into an oil reservoir through a fracturing oil pipe; the hydraulic anchor and the ball seat are respectively positioned in a high-permeability water flooded section in the well, and the two K344 packers are positioned in a low-permeability residual oil enrichment section between the high-permeability water flooded sections.
Preferably, in step S4, the acid fracturing and repeated fracturing are performed continuously, specifically, earth acid is injected alternately in stages under a small displacement condition, so as to reduce the fracture pressure and the net pressure in the fracture, control the fracture height, and realize the initiation and extension of the turning fracture; then injecting linear glue with medium displacement to perform seam forming extension of the steering crack; and finally, injecting gel with large discharge capacity to carry a propping agent to fill the diversion cracks and prop the main cracks.
Preferably, the small discharge capacity is 0.8-1.0 m3Min; the stage alternate injection is performed according to the length of 5-10 m3Or the thickness of the oil layer per meter is 1m3Stearic acid and 10m3Acid is injected into the isolation liquid alternately in sequence, and the cumulative injection soil acid amount is 20-30m3。
Preferably, the medium discharge capacity is 1.0-1.5 m3And/min, injecting the guanidine gum base solution.
Preferably, the large displacement is > 2.0m3And/min, injecting cross-linked guanidine gum.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
1. and preferably, modifying a low-permeability layer section, enriching residual oil, and laying a material foundation for improving the single-well productivity.
2. The old cracks are not treated, and the old cracks are not extended for the second time, so that the purpose of controlling water can be achieved.
3. The method is characterized in that a new seam is laterally created under simple process conditions, a directional perforating gun is used for carrying out double-wing or single-wing perforation according to the distribution position of the residual oil, the fracture is forced to initiate and realize the fracture steering, the fracture direction is communicated with the residual oil, and the purpose of digging and submerging the residual oil is achieved.
4. By utilizing different liquid combinations and different construction displacement combinations, the steering radius of the crack is improved, the net pressure of the crack is reduced, the steering crack is prevented from extending in the old crack, and the extending of the crack is realized to effectively remain oil; the water control and oil increase are obvious, and the benefit is obvious.
5. The cost is low, and the drilling, well cementation or land acquisition expenses of a new well, an encrypted well and the like are not generated.
The method provides a technical reference for improving the oil well productivity, using the residual oil and improving the recovery ratio of the oil deposit homogeneous well in the medium and high water-cut period.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention:
fig. 1 is a schematic structural diagram of a double-seal fracturing string according to the present invention.
In the figure: 1-ball seat (with ball), 2-K344 packer, 3-pressure guiding sand blower, 4-tubing adjusting short section, 5-K344 packer, 6-hydraulic anchor, 7-fracturing tubing, and 8-oil layer casing.
Detailed Description
The present invention will be described in detail with reference to specific embodiments, which are illustrative of the invention and are not to be construed as limiting the invention.
The embodiment of the invention provides a repeated fracturing method for realizing lateral residual oil potential excavation of an ultra-low permeability oil reservoir old well, which comprises the following steps:
s1, selecting a potential interval of the production well that is laterally of the predominate direction of water flooding.
The water flooding dominant direction is consistent with the well drainage direction of well pattern arrangement, namely the direction of the maximum horizontal main stress of the reservoir. Taking a rhombic inverted nine-point well pattern as an example, the water flooding dominant direction is generally the direction of the well row of the corner wells, the production wells in the direction are basically communicated with the water injection wells at the later stage to form a waterline, and therefore, the preferred potential wells are side wells lateral to the waterline. Meanwhile, the preferential potential interval is a low-permeability layer non-perforated well section with interlayer development mainly according to the physical property condition of the oil interval, and the interlayer thickness of the preferential potential interval and the original perforated well section is generally more than 2-3 m.
And S2, performing directional perforation on the potential interval and the remaining oil distribution direction.
The directional perforation method is generally a cable transmission directional perforation method with better oil field applicability to perform perforation, and the perforation direction is determined according to the distribution of residual oil (generally vertical to the well drainage direction); the phase of the perforating gun is 180 degrees, if double-wing symmetrical cracks are formed on two sides of the waterline, the charges are loaded in the two sides and the perforating is carried out simultaneously; if a single-wing fracture is made only on one side of the waterline, only the charge holes need to be installed in the same side direction.
And S3, setting a double-seal fracturing string for the new perforation interval.
As shown in fig. 1, the double-seal fracturing string comprises a ball seat (with ball) 1, a K344 packer 2, a pressure-guiding sand blower 3, an oil pipe adjusting nipple 4, a K344 packer 5 and a hydraulic anchor 6 which are sequentially connected from bottom to top in an oil layer casing 8 through a fracturing oil pipe 7. The double-seal fracturing string is used for setting by means of hydraulic pressurization in an oil pipe in the fracturing process. The hydraulic anchor 6 and the ball seat 1 are respectively positioned at a high-permeability water flooded section in the well, and the two K344 packers 2 and 5 are positioned at a low-permeability residual oil enrichment section between the high-permeability water flooded sections. And 2K 344 packers are used for effectively sealing the new perforation section in the step S2, so that the perforation section is independently transformed.
And S4, performing acid fracturing and repeated fracturing on the directional perforation interval for continuous construction.
The acid fracturing and repeated fracturing continuous construction is mainly carried out under the condition of small discharge capacity (discharge capacity: 0.8-1.0 m)3/min) stage alternately injecting 20-30m of soil acid3The fracture pressure and the net pressure in the fracture are reduced, the height of the fracture is controlled, and the initiation and extension of the steering fracture are realized. Then medium discharge (discharge capacity: 1.0-1.5 m)3Min) linear glue (guanidine gum base fluid) is injected to carry out the seam making extension of the turning crack. Final large displacement (displacement: > 2.0 m)3Min) injecting gel (cross-linked guanidine gum) to carry proppant to fill the diversion fracture and effectively prop the main fracture. The stage alternate injection is performed according to the length of 5-10 m3(or the thickness of oil layer per meter is 1m3Earth acid) and 10m3The isolation liquid is injected with acid in sequence and alternately, the action distance of the acid liquid is increased, and the cumulative injection soil acid amount is 20-30m3。
This step has mainly 3 purposes: firstly, the small-displacement injection of the acid liquor can effectively reduce the fracture pressure of a new fracture, and meanwhile, the steering radius and the steering distance of the steering fracture are improved through the corrosion effect of the acid liquor on reservoir rock; second, the medium-displacement injection linear glue has small displacement and low liquid viscosity (viscosity is 10-20 mpas), can reduce net pressure in the crack turning and extending process, effectively control the crack height, and avoid the communication between the turning crack and the old crack; and thirdly, the large-discharge injection of the jelly glue can effectively support the formed cracks to achieve a certain crack width, and the effective laying of the propping agent is realized.
And S5, closing the well, open-blowing and producing the fracturing string for recovery.
By using the method of the invention to carry out 6-well field tests in old oil fields, the daily oil increase of a single well is more than 1.5t after the measures, the cumulative oil increase of the single well in the current year is 406t, which is 2.3 times of the cumulative oil increase of the single well of the conventional repeated fracturing well, the comprehensive water content of the production well is reduced by 4% after the measures, and the residual oil is obviously used.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (7)
1. A repeated fracturing method for realizing lateral fracture residual oil potential excavation of an ultra-low permeability oil reservoir old well is characterized by comprising the following steps:
s1, selecting a potential interval of the production well which is positioned in the lateral direction of the water flooding dominant direction; the water flooding dominant direction is consistent with the well drainage direction of well pattern arrangement, namely the direction of the maximum horizontal main stress of the reservoir;
s2, performing directional perforation on the potential interval and the distribution direction of the remaining oil; perforating by adopting a cable transmission oriented perforating method, wherein the perforating direction is vertical to the well drainage direction; the phase of the perforating gun is 180 degrees;
selecting a low-permeability layer non-perforated well section with interlayer development in the potential layer section, wherein the interlayer thickness between the potential layer section and the original perforated section is more than 2-3 m;
s3, setting a double-seal fracturing string in the new perforation interval, and setting by hydraulic pressurization in the oil pipe in the fracturing process;
s4, carrying out acid fracturing and repeated fracturing continuous construction on the directional perforation interval; in particular, earth acid is alternately injected in stages under the condition of small displacement, so that the fracture pressure and the net pressure in the fracture are reduced, the height of the fracture is controlled, and the initiation and extension of the steering fracture are realized; then injecting linear glue with medium displacement to perform seam forming extension of the steering crack; finally, injecting gel with large discharge capacity to carry a propping agent to fill the diversion cracks and prop the main cracks;
and S5, closing the well, open flowing, and taking out the double-seal fracturing string for recovery.
2. The repeated fracturing method for realizing the lateral residual oil excavation potential of the ultra-low permeability reservoir old well according to claim 1, wherein the water flooding dominant direction is a well row direction of an angle well, a production well and a water injection well are communicated together at the later stage of the direction to form a waterline, and a potential well is a side well in the lateral direction of the waterline.
3. The repeated fracturing method for realizing the lateral residual oil potential excavation of the ultra-low permeability reservoir old well according to the claim 1 or 2, characterized in that if double-wing symmetrical cracks are built on two sides of a waterline, the two sides are charged and perforated simultaneously; if a single-wing fracture is made only on one side of the waterline, only the charge holes need to be installed in the same side direction.
4. The repeated fracturing method for realizing the lateralization of the residual oil from the side of the fracture for the old well of the ultra-low permeability reservoir as claimed in claim 1, wherein in the step S3, the double-sealing fracturing string comprises a ball seat, a K344 packer, a pressure-guiding sand blower, an oil pipe adjusting short section, a K344 packer and a hydraulic anchor which are sequentially connected from bottom to top and are communicated and lowered into a reservoir casing through a fracturing oil pipe; the hydraulic anchor and the ball seat are respectively positioned in a high-permeability water flooded section in the well, and the two K344 packers are positioned in a low-permeability residual oil enrichment section between the high-permeability water flooded sections.
5. The repeated fracturing method for realizing lateral residual oil potential excavation of the ultra-low permeability reservoir old well according to claim 1, wherein the small displacement is 0.8-1.0 m3Min; the stage alternate injection is performed according to the length of 5-10 m3Or the thickness of the oil layer per meter is 1m3Stearic acid and 10m3Acid is injected into the isolation liquid alternately in sequence, and the cumulative injection soil acid amount is 20-30m3。
6. The repeated fracturing method for realizing lateral residual oil potential excavation of a fracture for the ultra-low permeability reservoir old well according to claim 1, wherein the medium displacement is 1.0-1.5 m3And/min, injecting the guanidine gum base solution.
7. The repeated fracturing method for realizing lateral residual oil potential excavation of a fracture for the ultra-low permeability reservoir old well according to claim 1, wherein the large displacement is more than 2.0m3And/min, injecting cross-linked guanidine gum.
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| CN111219177B (en) * | 2020-03-03 | 2022-05-10 | 中国石油天然气股份有限公司 | 3-inch and half-small-borehole fracturing method for sidetracking horizontal well of ultra-low permeability sandstone reservoir |
| CN111472746B (en) * | 2020-04-17 | 2022-01-07 | 捷贝通石油技术集团股份有限公司 | Technological method for isolated dessert communication among carbonate fracture-cavity oil reservoir wells |
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| CN203394491U (en) * | 2013-06-05 | 2014-01-15 | 中国石油天然气股份有限公司 | Perforation and fracturing integrated tubular column for selectively and repeatedly reforming old well of oil field |
| CN106567701B (en) * | 2015-10-09 | 2019-01-01 | 中国石油化工股份有限公司 | A kind of hydraulic fracturing method |
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| CN109779592A (en) * | 2018-12-28 | 2019-05-21 | 中国石油天然气股份有限公司 | Perforation fracturing method for longitudinal residual oil submergence of old well of single sand body oil reservoir |
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