CN105041274A - Short-range two-layer oil-gas reservoir commingled production technique - Google Patents
Short-range two-layer oil-gas reservoir commingled production technique Download PDFInfo
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- CN105041274A CN105041274A CN201510405942.2A CN201510405942A CN105041274A CN 105041274 A CN105041274 A CN 105041274A CN 201510405942 A CN201510405942 A CN 201510405942A CN 105041274 A CN105041274 A CN 105041274A
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Abstract
The invention relates to the technical field of oil-gas reservoir production, in particular to a short-range two-layer oil-gas reservoir commingled production technique. The technique includes the steps of S1, drilling a horizontal well (1) in a production layer interlayer (5); S2, cementing the horizontal well (1) drilled in the step S1; S3, completing the horizontal well (1) cemented in the step S2; S4, subjecting the production layer interlayer (5), where a horizontal segment (2) of the horizontal well (1) completed in the step S3 is located, to multi-segment fracturing so as to form fractures (3) perpendicular to the production layer interlayer (5), with the fractures (3) penetrating the production layer interlayer (5) to connect two production layers (4) adjacent to the production layer interlayer (5). The horizontal well is drilled in the production layer interlayer, two production layers can be produced at same time, the two production layers are produced by single drilling, production time of the production layers is shortened, production value is increased, and cost is saved.
Description
Technical field
The present invention relates to oil-gas reservoir production technique field, particularly relate to one closely two-layer oil-gas reservoir conjunction excavating technology.
Background technology
The main method of existing oil-gas reservoir commingling production has: 1, straight well or directional well drill all payzones, then combination producing, but to adopt earial drainage face limited owing to closing, and production capacity is low, deficiency in economic performance; 2, open different payzones with branch well drilling to carry out conjunction and adopt, drainage area is large, but cost is higher, and multilayer will bore multiple Multilateral Wells, and technological requirement is high; 3, adopt at payzone horizontal well drilling to realize multiple-zone production, need in the drilling well respectively of different payzone, cost is higher.
Current horizontal well drilling is all in payzone drilling well, realizes multiple-zone production according to horizontal well drilling, and need in the drilling well respectively of different payzone, cost is higher, and it is high to control seam in fracturing process, prevents pressure from wearing payzone cap rock and interlayer.The high upper downward-extension of vertical fracture seam, when oil reservoir is thinner or barrier stress is less, crack likely penetrates producing zone and enters interlayer.Increase further if seam is high, penetrate interlayer, crack is likely worn as the water layer outside interlayer or gas-bearing formation, causes pressure break failure, if crack is too high, under same cultivation scale, can affect the extension that seam is long, not reach the object of pressure break.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention solves existing oil-gas reservoir conjunction to adopt the problem that cost is large, production capacity is low.
(2) technical scheme
In order to solve the problems of the technologies described above, the invention provides one closely two-layer oil-gas reservoir conjunction excavating technology, comprising the following steps:
S1, at payzone interlayer horizontal well drilling;
S2, cements the well to the horizontal well in step S1;
S3, carries out completion to the horizontal well in step S2;
S4, carries out multistage pressure break to the payzone interlayer at the horizontal segment place of the horizontal well formed in step S3, forms multiple pressure-break perpendicular to described payzone interlayer, and described pressure-break passes described payzone interlayer conducting two payzones adjacent with described payzone interlayer.
Wherein, the completion in described step S3 adopts cased hole completion.
Wherein, in described step S4, multistage pressure break adopts fracturing.
Wherein, the load fluid that in described step S4, fracturing adopts is aqueous fracturing fluid.
Wherein, in described step S4, multistage pressure break adopts hydraulic sand blasting staged fracturing.
Wherein, in described step S4, hydraulic jet perforation pressure break comprises the following steps:
S41, carries out hydraulic jet perforation by the predetermined perforating site to the horizontal segment of described horizontal well under hydraulic ejector, forms the ejection channel perpendicular to described payzone interlayer at payzone interlayer;
S42, after described ejection channel is formed, annular space pumps into prepad fluid pressurization, makes payzone interlayer produce pressure-break and starts to extend towards depths, two payzones that conducting is adjacent with described payzone interlayer;
S43, pumps into load fluid via oil pipe, for supporting described pressure-break;
S44, Move tool, to other predetermined perforating site of described horizontal segment, repeats step S41 ~ S43, final formation many described pressure-breaks.
(3) beneficial effect
Technique scheme tool of the present invention has the following advantages: oil-gas reservoir of the present invention closes excavating technology at payzone interlayer horizontal well drilling, produce crack by multistage pressure break at payzone interlayer and link up upper and lower two payzones, can exploit two payzones simultaneously, at payzone horizontal well drilling in prior art, the oil gas exploiting different payzone needs to carry out drilling well at each payzone respectively, can a drilling well, exploit two payzones, shorten payzone recovery time, increase the output value, save cost; Meanwhile, need strict control seam high at payzone horizontal well drilling in prior art, and in present invention process, the high permissible value of seam of vertical pressure-break is comparatively large, comprise the thickness of whole payzone interlayer and upper and lower two payzones, fracture height control is comparatively easy.
Accompanying drawing explanation
Fig. 1 be the embodiment of the present invention one closely two-layer oil-gas reservoir close the schematic diagram of excavating technology process.
In figure: 1: horizontal well; 2: horizontal segment; 3: pressure-break; 4: payzone; 5: payzone interlayer.
Detailed description of the invention
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belongs to the scope of protection of the invention.
As shown in Figure 1, embodiments provide one closely two-layer oil-gas reservoir close excavating technology, payzone interlayer 5 thickness between two payzones 4 that this technique is applicable to oil-gas reservoir is less than 100m, and concrete, two payzones 4 are layer of oil gas production.Minimum principal stress direction, stratum, oil-gas reservoir place is the closely two-layer oil-gas reservoir of horizontal direction, produces pressure-break 3 perpendicular to payzone interlayer 5 to make payzone interlayer 5.
Design according to wanting the geological condition of producing oil gas reservoir and forecast production to carry out horizontal well 1, mainly comprise the length of horizontal well 1 horizontal segment 2 and the design of horizontal well track before construction.
Closely two-layer oil-gas reservoir conjunction excavating technology comprises the following steps:
S1, at payzone interlayer 5 horizontal well drilling 1;
S2, cements the well to horizontal well in step S1 1;
S3, carries out completion to the horizontal well 1 in step S2;
S4, carries out multistage pressure break to the payzone interlayer 5 at horizontal segment 2 place of the horizontal well 1 formed in step S3, forms multiple pressure-break 3 perpendicular to payzone interlayer 5, and pressure-break 3 passes payzone interlayer 5 conducting two payzones 4 adjacent with payzone interlayer 5.Bored horizontal well 1 in payzone interlayer 5 after, enter sleeve pipe under in horizontal well 1, and inject cement to the annular space between sleeve pipe and the well of horizontal well 1 and complete well cementation, carrying out well cementation to horizontal well 1 can oil-separating layer, gas-bearing formation and water layer, prevents from ganging up mutually.Every saliva horizontal well all will be formulated according to different geological conditions and reasonably to cement the well mode, enters the casing program in horizontal well 1, the size of each layer sleeve pipe and depth of setting under comprising.Adopt the mode completion such as cased hole completion or gravel packing screen completion, then multistage pressure break is carried out to the horizontal well 1 after completion, form the pressure-break 3 of conducting two payzones 4 adjacent with payzone interlayer 5.
Oil-gas reservoir of the present invention closes excavating technology at payzone interlayer 5 horizontal well drilling 1, produce pressure-break 3 by multistage pressure break at payzone interlayer 5 and carry out upper and lower two payzones 4 of conducting, can exploit two payzones 4 simultaneously, at payzone horizontal well drilling 1 in prior art, the oil gas exploiting different payzone needs to carry out drilling well at each payzone respectively, can a drilling well, exploit two payzones, shorten payzone recovery time, increase the output value, save cost.Meanwhile, need strict control seam high at payzone horizontal well drilling in prior art, and in present invention process, the high permissible value of the seam of pressure-break 3 is comparatively large, comprise the thickness of whole payzone interlayer 5 and upper and lower two payzones 4, fracture height control is comparatively easy.
Oil-gas reservoir of the present invention is closed in the step S3 of excavating technology and is preferably adopted cased hole completion.Adopt the mode of cased hole completion to carry out selective operation and production, completion sequence is comparatively simple, effectively can prevent well slough, is conducive to adopting well stimulation and well workover.It should be noted that, the completion mode of horizontal well 1 of the present invention is not limited to cased hole completion, also can adopt other completion mode, such as barefoot completion and gravel packing screen completion etc.
The multistage pressure break that oil-gas reservoir of the present invention is closed in excavating technology step S4 preferably adopts fracturing.Fracturing is the performance utilizing liquid conduction pressure, high-pressure pump group is utilized on ground, with the discharge capacity being greater than formation absorption ability, fracturing fluid is pumped in horizontal well 1, high pressure has been suppressed in the shaft bottom of horizontal well 1, the pressure in shaft bottom exceedes geostatic stress and the tensile strength of rock of payzone interlayer 5, produces pressure-break 3 at payzone interlayer 5, continues the load fluid with proppant to inject pressure-break 3, pressure-break 3 is extended, and concurrent fracturing seam 3 is supported.Define after high-pressure pump group quits work and vertically run through payzone interlayer 5 and the Thief zone back-up sand pressure-break 3 with one fixed width, pressure-break 3 conducting two payzones 4 adjacent with payzone interlayer 5 formed, pressure-break 3 is as oil gas flow channel, and filtrational resistance is little, can play increasing yield and injection effect.Preferably, fracturing fluid adopts aqueous fracturing fluid, and aqueous fracturing fluid is using water as decentralized medium, adds various inorganic agent, particularly water-soluble polymer, forms the working solution with the stronger combination property of fracturing technology requirement.Aqueous fracturing fluid is safer, clean, and easily with the of the fracturing fluid character of additive control.
The multistage pressure break that oil-gas reservoir of the present invention is closed in excavating technology step S4 preferably adopts hydraulic jet perforation pressure break.Particularly, hydraulic jet perforation pressure break comprises the following steps: S41, carries out hydraulic jet perforation, form the ejection channel perpendicular to payzone interlayer 5 at payzone interlayer 5 by under hydraulic ejector to the predetermined perforating site of the horizontal segment 2 of described horizontal well 1; S42, after ejection channel is formed, annular space pumps into prepad fluid pressurization, in oil jacket annular space, namely pumps into prepad fluid improve bottom pressure, makes payzone interlayer 5 produce pressure-break 3 and starts to extend towards depths, two payzones 4 that conducting is adjacent with payzone interlayer 5; S43, pumps into load fluid via oil pipe, for support fracturing seam 3; S44, Move tool, to other predetermined perforating site of described horizontal segment 2, repeats step S41 ~ S43, final formation many pressure-breaks 3.Hydraulic jet perforation fracturing technique is according to bernoulli principle, the pressure energy of liquid in tubing string is converted into the high speed kinetic energy of nozzle exit, according to hydrodynamics momentum-impulse principle, penetrate sleeve-penetrating and rock, form pressure-break 3 at payzone interlayer 5 and adjacent with payzone interlayer 5 two payzones 4.By controlling hydraulic ejector, can the accurately position of Selective Pressure crack 3 crack initiation and direction.
The present invention not only may be used for the exploitation of oil gas in oil-gas reservoir, also can be used for the exploitation of coal bed gas in coal bed gas field.Give this technique for the specific embodiment of in coal bed gas field by numerical simulation calculation, coal bed gas field has two payzones, and payzone is coal gas layer, has payzone interlayer between two payzones.The thickness of one of them payzone is 1.5 meters, and permeability is 0.12 × 10
-3μm
2; The thickness of another payzone is 2.2 meters, and permeability is 0.18 × 10
-3μm
2; The thickness of payzone interlayer is 6.71m.Adopt oil-gas reservoir of the present invention to close excavating technology cumulative production 10 years, the output value of accumulation coal bed gas is about 2.5 times that adopt straight well exploitation.Need to bore multiple horizontal well or Multilateral Wells according to Multilateral Wells exploitation, increase cost of winning.Therefore, adopting oil-gas reservoir of the present invention to close excavating technology can be cost-saving, increases the output value.
In theory, the length of horizontal well 1 horizontal segment 2 is longer, and oil and gas production is higher, and for obtaining higher productivity index, pressure-break 3 number that needs press off is just more.Increase horizontal segment 2 length and must increase drilling cost, the number increasing pressure-break 3 also must increase the difficulty of staged fracturing technique, and therefore, the length of horizontal segment 2 comprehensively should be determined according to oil-gas reservoir engineering and economic optimization structure.
In sum, excavating technology is closed in closely two-layer oil-gas reservoir of the present invention not only can be cost-saving, can also increase the output value of oil gas.
Last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (6)
1. closely an excavating technology is closed in two-layer oil-gas reservoir, it is characterized in that, comprises the following steps:
S1, at payzone interlayer (5) horizontal well drilling (1);
S2, cements the well to the horizontal well (1) in step S1;
S3, carries out completion to the horizontal well (1) in step S2;
S4, multistage pressure break is carried out to the payzone interlayer (5) at horizontal segment (2) place of the horizontal well formed in step S3 (1), form multiple pressure-break (3) perpendicular to described payzone interlayer (5), and described pressure-break (3) is through described payzone interlayer (5) conducting two payzones (4) adjacent with described payzone interlayer (5).
2. excavating technology is closed in closely two-layer oil-gas reservoir according to claim 1, it is characterized in that: the completion in described step S3 adopts cased hole completion.
3. excavating technology is closed in closely two-layer oil-gas reservoir according to claim 1, it is characterized in that: in described step S4, multistage pressure break adopts fracturing.
4. excavating technology is closed in closely two-layer oil-gas reservoir according to claim 3, it is characterized in that: the fracturing fluid that in described step S4, fracturing adopts is aqueous fracturing fluid.
5. excavating technology is closed in closely two-layer oil-gas reservoir according to claim 1, it is characterized in that: in described step S4, multistage pressure break adopts hydraulic sand blasting staged fracturing.
6. excavating technology is closed in closely two-layer oil-gas reservoir according to claim 5, and it is characterized in that, in described step S4, hydraulic jet perforation pressure break comprises the following steps:
S41, the predetermined perforating site of the horizontal segment (2) to described horizontal well (1) under hydraulic ejector is carried out hydraulic jet perforation, forms the ejection channel perpendicular to described payzone interlayer (5) at payzone interlayer (5);
S42, after described ejection channel is formed, annular space pumps into prepad fluid pressurization, makes payzone interlayer (5) produce pressure-break (3) and starts to extend towards depths, two payzones (4) that conducting is adjacent with described payzone interlayer (5);
S43, pumps into load fluid via oil pipe, for supporting described pressure-break (3);
S44, at other predetermined perforating site of described horizontal segment (2), repeats step S41 ~ S43, final formation many described pressure-breaks (3).
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106979001A (en) * | 2017-06-06 | 2017-07-25 | 华美孚泰油气增产技术服务有限责任公司 | Thick-layer glutenite horizontal well solid seam net fracturing optimizing method |
| CN110821462A (en) * | 2019-10-16 | 2020-02-21 | 新疆中凌工程技术有限公司 | Method for drawing tail end of horizontal well group with interlayer in SAGD control well reservoir |
| CN111022022A (en) * | 2019-11-06 | 2020-04-17 | 中国石油天然气股份有限公司 | Fracturing method for realizing full exploitation of multiple small-layer laminated development thin-difference reservoir |
| CN114075958A (en) * | 2020-08-10 | 2022-02-22 | 中国石油化工股份有限公司 | Tool and method suitable for through-layer fracturing of longitudinal multi-layer horizontal well |
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| CN104564001A (en) * | 2014-12-03 | 2015-04-29 | 中国石油化工股份有限公司 | Horizontal well multi-cluster fracturing method and multi-cluster perforating and fracturing pipe column for implementing method |
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| CN104564001A (en) * | 2014-12-03 | 2015-04-29 | 中国石油化工股份有限公司 | Horizontal well multi-cluster fracturing method and multi-cluster perforating and fracturing pipe column for implementing method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106979001A (en) * | 2017-06-06 | 2017-07-25 | 华美孚泰油气增产技术服务有限责任公司 | Thick-layer glutenite horizontal well solid seam net fracturing optimizing method |
| CN110821462A (en) * | 2019-10-16 | 2020-02-21 | 新疆中凌工程技术有限公司 | Method for drawing tail end of horizontal well group with interlayer in SAGD control well reservoir |
| CN110821462B (en) * | 2019-10-16 | 2022-03-25 | 新疆中凌工程技术有限公司 | Method for drawing tail end of horizontal well group with interlayer in SAGD control well reservoir |
| CN111022022A (en) * | 2019-11-06 | 2020-04-17 | 中国石油天然气股份有限公司 | Fracturing method for realizing full exploitation of multiple small-layer laminated development thin-difference reservoir |
| CN114075958A (en) * | 2020-08-10 | 2022-02-22 | 中国石油化工股份有限公司 | Tool and method suitable for through-layer fracturing of longitudinal multi-layer horizontal well |
| CN114075958B (en) * | 2020-08-10 | 2024-04-05 | 中国石油化工股份有限公司 | Tool and method suitable for longitudinal multilayer horizontal well through-layer fracturing |
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Application publication date: 20151111 |