CN103615224B - Solvent improves method and the well pattern structure of exploiting thickened oil through steam assisted gravity drainage Tibetan - Google Patents
Solvent improves method and the well pattern structure of exploiting thickened oil through steam assisted gravity drainage Tibetan Download PDFInfo
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Abstract
The present invention is method and the well pattern that a kind of solvent improves exploiting thickened oil through steam assisted gravity drainage Tibetan, and this well pattern comprises SAGD Horizontal Well pair; Steam injection well horizontal segment is by cutting seam sieve tube completion; Be drilled with multi-lateral well section in steam injection well horizontal segment, each multi-lateral well section is through in the middle part of oil reservoir intraformational bed; Each multi-lateral well section adopts liner completion; In steam injection well screen casing, subordinate enters to reach the first long oil pipe of steam injection well tiptoe; Enter the solvent parallel with the first long oil pipe under in steam injection well screen casing to inject and be responsible for, solvent injection is responsible for and is tightly connected by extension hanger between the tail pipe in each multi-lateral well section; The second long oil pipe is entered to horizontal segment end under in producing well; Straight well monitor well is also deployed with in this well pattern.In the present invention, steam enters oil reservoir and upwards grows vapor chamber, hot solvent and steam system enter interlayer top oil reservoir from being responsible for through tail pipe, accelerate the thermal communication between oil reservoir and vapor chamber and fluid communication, can force to break through interlayer, promote that interlayer top vapor chamber is grown, significantly improve recovery ratio.
Description
Technical field
The invention relates to the production technique of heavy crude reservoir in a kind of oil field, particularly relate to method and well pattern structure that a kind of solvent improves exploiting thickened oil through steam assisted gravity drainage Tibetan.
Background technology
SAGD (SteamAssistedGravityDrainage, being called for short SAGD) technology is that Canadian Bulter in 1978 invented, and obtains successful Application at the heavy crude reservoir on the ground such as Liaohe Oil Field, Xinjiang Oilfield of Canadian oil-sand mining area, China; Its principle disposes horizontal well pair stacked up and down at same oil reservoir, high-quality steam is injected in the steam injection well of top, steam is far smaller than crude oil and upwards onlap forms vapor chamber in the earth formation due to density, along with the continuous injection of steam, vapor chamber constantly upwards and sideways expansion, with the crude oil generation interchange of heat in oil reservoir; Reduced by the viscosity of crude heated, flow downward under gravity with condensed water, extraction from the horizontal production well of oil reservoir bottom.
Solvent assisted gravity drainage (being called for short: SAGD assisted by solvent) technology is the technology developed on SAGD basis.Its principle adopts the casing programme identical with SAGD exploitation method, by one or more in propane, butane, pentane, according to injecting SAGD steam injection well after certain ratio and steam, because propane, butane, these three kinds of light paraffins solvents of pentane (being called for short: solvent) have good dissolution to viscous crude, can Viscosity of Heavy Crude Oil be reduced after dissolving viscous crude, improve viscous crude mobility; What add steam itself adds the glutinous effect of heat drop, and the mixed system of above-mentioned light paraffins solvent and steam can accelerate viscous crude and fall glutinous, improves vapor chamber expansion rate and viscous crude flowing velocity, thus improves draining speed and output.
Because the heavy crude reservoir of China all belongs to continental deposit environment, grow in oil reservoir and have a large amount of shales or upgrading interlayer, when interlayer, in oil reservoir, distribution or the vertical stacked vapor chamber that causes mutually cannot upwards be expanded in flakes, or thickness of interlayer is too large to such an extent as to steam cannot be broken through time, the oil reservoir on interlayer top often cannot realize effectively employing, thus have lost a large amount of reserves; Cause vapor chamber to decline too early simultaneously, shorten the economical and effective recovery time of SAGD.The SAGD mining site in China Liaohe River, Deng You district, Xinjiang is produced and is shown, due to the impact of interlayer, horizontal segment vapor chamber grow scale less than the horizontal well group of SAGD horizontal section length 70%.Because solvent assists SAGD technology to adopt the casing programme identical with steam assisted gravity drainage techniques, its limitation is, can only accelerate vapor chamber draining speed, for the oil reservoir that interlayer is grown in a large number, equally cannot the section of improving the standard development degree, cause reserves to lose larger.
The SAGD heavy crude reservoir stablize for interlayer, distributed in flakes, does not also have the exploitation method that effective vapor chamber breakthrough interlayer is evenly grown at present.
Thus, the present inventor relies on experience and the practice of being engaged in relevant industries for many years, proposes method and well pattern structure that a kind of solvent improves exploiting thickened oil through steam assisted gravity drainage Tibetan, to overcome the defect of prior art.
Summary of the invention
A kind of solvent is the object of the present invention is to provide to improve method and the well pattern structure of exploiting thickened oil through steam assisted gravity drainage Tibetan, the heavy crude reservoir grow in a large number for interlayer, distributed in flakes utilizes multi-branched well to inject light paraffins solvent, realize steam and break through interlayer, promote that vapor chamber is evenly grown, significantly improve recovery ratio thus.
The object of the present invention is achieved like this, and a kind of solvent improves the method that exploiting thickened oil through steam assisted gravity drainage is hidden, and described oil production method comprises the following steps:
(1) well pattern is set in oil reservoir region; Described well pattern comprises at least one SAGD Horizontal Well pair; Described SAGD Horizontal Well is formed by steam injection well and producing well; The steam injection well water section of putting down is positioned at above producing well horizontal segment;
(2) according to oil reservoir region oil reservoir intraformational bed recognition result, determine the multi-lateral well section number of top steam injection horizontal well and be drilled with described multi-lateral well section; Described multi-lateral well section is through in the middle part of described interlayer;
(3) described steam injection well horizontal segment adopts cutting seam sieve tube completion, and described steam injection well horizontal segment is connected by expansible link with between each multi-lateral well section, and described each multi-lateral well section adopts liner completion; At described interlayer with upper/lower positions, described tail pipe wall does not punch, in described interlayer and the above position of interlayer, on described tail pipe wall, homogenous linear punches tail pipe end, aperture 3 ~ 6mm, hole density 3 ~ 5/meter; Described tail pipe end is opening and stretches into multi-lateral well section end;
(4) in described steam injection well screen casing, subordinate enters to reach the first long oil pipe of steam injection well tiptoe, and on described first long oil tube wall, corresponding described screen casing is evenly provided with multiple open-work;
(5) enter the solvent parallel with the first long oil pipe under in described steam injection well screen casing to inject and be responsible for, described solvent injects supervisor's endcapped, and described solvent injection is responsible for and is adopted extension hanger to realize mechanical connection between the tail pipe in described each multi-lateral well section;
(6) the second long oil pipe is entered to horizontal segment end under in described producing well;
(7) at SAGD well to the horizontal segment left and right sides and the correspondence position being positioned at each multi-lateral well section sandwich penetrating disposes straight well monitor well;
(8) at the production initial stage, steam injection well and producing well all adopt the steam injection of long oil pipe, the mode of ring drainage carries out cyclic preheat;
(9) from the production initial stage, each multi-lateral well section adopts handles up from solvent injection supervisor to the tail pipe heat injection solvent in each multi-lateral well section and steam system;
(10) after steam injection well and producing well cyclic preheat terminate, steam injection well injects steam continuously from the first long oil pipe and annular space, and producing well continuous draining is produced;
(11) vapor chamber lifting height is monitored continuously from straight well monitor well, when the vapor chamber of growing from horizontal segment rises gradually, and with each multi-lateral well section in interlayer top handle up solvent-vapor chamber of being formed be communicated with time, stopping is handled up, and changes into and injects supervisor continuously to each multi-lateral well section injection hot solvent and steam system from solvent;
(12) when straight well monitor well monitor the corresponding interlayer top of all multi-lateral well sections all grow vapor chamber time, each multi-lateral well section changes into injects pure steam; Steam injection well first long oil pipe and annular space continue to inject pure steam continuously.
In a better embodiment of the present invention, in described step (2), the continuous thickness of described interlayer is greater than 1.5 meters, interlayer is greater than 15 meters along horizontal segment direction length, be greater than 8 meters along horizontal segment direction width, permeability is less than 50 millidarcies, and interlayer top is greater than 2 meters apart from oil reservoir top circle; Described multi-lateral well section end-to-end distance is from 1 ~ 2 meter, oil reservoir top circle; In the steam injection well of each SAGD Horizontal Well centering, multi-lateral well hop count amount controls at 1 ~ 6.
In a better embodiment of the present invention, before described step (2), according to SAGD Horizontal Well to the core data of getting in drilling process, with brill well logging, well log interpretation data, identify that this SAGD Horizontal Well is to the thickness of interlayer in the oil reservoir of place, type, spread scope, and carry out the permeability test of getting core interlayer, determine its permeability.
In a better embodiment of the present invention, in described step (7), described monitor well distance horizontal segment 5 ~ 10 meters.
In a better embodiment of the present invention, in described step (8), described cyclic preheat steam injection rate is 60 ~ 100 tons/day, and the described cyclic preheat time is 150 ~ 200 days.
In a better embodiment of the present invention, in described step (9), the ratio of the solvent that described note solvent is handled up and steam mixed water injection is mass ratio 1:5 ~ 2:5; Cyclic injection amount is 600 ~ 800 tons, injection rate is 60 ~ 80 tons/day, and the wellhead temperature of described injection system is vapo(u)rous temperature corresponding under well intake pressure, and the described stewing well time is 3 ~ 5 days, described drawing speed is 60 ~ 80 tons/day, and the described back production time is 13 ~ 18 days.
In a better embodiment of the present invention, in described step (11), the hot solvent of described continuous injection and the ratio of steam system be hot solvent with quality of steam than 1:5 ~ 2:5, the wellhead temperature of described injection system is vapo(u)rous temperature corresponding under well intake pressure, and described total injection rate (total mass velocity of hot solvent and steam system) is 40 ~ 80 tons/day.
In a better embodiment of the present invention, in described step (12), it is 100 ~ 150 tons/day that described each multi-lateral well section changes the speed injecting pure steam into.
Object of the present invention can also realize like this, and a kind of solvent improves the well pattern structure that exploiting thickened oil through steam assisted gravity drainage is hidden, and described well pattern comprises at least one SAGD Horizontal Well pair; Described SAGD Horizontal Well is formed by steam injection well and producing well; The steam injection well water section of putting down is positioned at above producing well horizontal segment; Described steam injection well horizontal segment adopts cutting seam sieve tube completion; In steam injection well horizontal segment, be drilled with multi-lateral well section, described each multi-lateral well section is through in the middle part of oil reservoir intraformational bed; Described steam injection well horizontal segment is connected by expansible link with between each multi-lateral well section, and described each multi-lateral well section adopts liner completion; At described interlayer with upper/lower positions, described tail pipe wall does not punch, in described interlayer and the above position of interlayer, on described tail pipe wall, homogenous linear punches tail pipe end, aperture 3 ~ 6mm, hole density 3 ~ 5/meter; Described tail pipe end is opening and stretches into multi-lateral well section end; In described steam injection well screen casing, subordinate enters to reach the first long oil pipe of steam injection well tiptoe, and on described first long oil tube wall, corresponding described screen casing is evenly provided with multiple open-work; Enter the solvent parallel with the first long oil pipe under in described steam injection well screen casing to inject and be responsible for, described solvent injects supervisor's endcapped, and described solvent injection is responsible for and is tightly connected by extension hanger between the tail pipe in described each multi-lateral well section; The second long oil pipe is entered to horizontal segment end under in described producing well; At SAGD well to the horizontal segment left and right sides and the correspondence position being positioned at each multi-lateral well section sandwich penetrating disposes straight well monitor well.
In a better embodiment of the present invention, the continuous thickness of described oil reservoir intraformational bed is greater than 1.5 meters, and interlayer is greater than 15 meters along horizontal segment direction length, is greater than 8 meters along horizontal segment direction width, permeability is less than 50 millidarcies, and interlayer top is greater than 2 meters apart from oil reservoir top circle; Described multi-lateral well section end-to-end distance is from 1 ~ 2 meter, oil reservoir top circle; In the steam injection well of each SAGD Horizontal Well centering, multi-lateral well hop count amount controls at 1 ~ 6.
In a better embodiment of the present invention, on described first long oil tube wall, the quantity of open-work is 10 ~ 15, and open-work aperture is 6 ~ 10mm.
In a better embodiment of the present invention, described monitor well distance horizontal segment 5 ~ 10 meters.
From the above mentioned, the present invention utilizes top multiple hole horizontal well (steam injection well) steam injection, recover the oil in bottom light water horizontal well (producing well), in steam injection process, steam enters oil reservoir from steam injection well screen casing, upwards grows vapor chamber, and hot solvent and steam system are injected to be responsible for from solvent and entered interlayer top oil reservoir through tail pipe, accelerate the thermal communication between top oil reservoir and vapor chamber and fluid communication, thus realize forcing to break through interlayer, promote that interlayer top vapor chamber is grown, significantly improve recovery ratio thus.
The present invention has following technical advantage:
(1) effect is blocked due to interlayer, in SAGD development process, the vapor chamber of the horizontal segment that interlayer is corresponding is difficult to upwards grow, first exploitation method provided by the present invention adopts multi-branched well section to penetrate the interlayer that continuous thickness is comparatively large, distribution is wider, by special completion tubular column structure, inject solvent and steam system to interlayer top, force to promote that vapor chamber is grown;
(2) in described steam injection well screen casing, subordinate enters to reach the punching long oil pipe of steam injection well tiptoe, can in steam injection process, oil reservoir is entered along steam injection well horizontal segment screen casing, under avoiding long oil pipe not punching situation, the admission of the steam injection well water section of putting down end is too much, and the admission of steam injection well horizontal segment mid portion oil reservoir is less, vapor chamber is caused to grow poor situation.
(3) the present invention adopts parameter by special note, in conjunction with straight well monitoring, realizes horizontal segment and evenly employs and evenly grow this purpose with vapor chamber.Specifically, early stage each multi-lateral well section is handled up and is promoted interlayer top reservoir producing and fall glutinous, and forms vapor chamber small-sized one by one at interlayer top; Meanwhile, steam injection well injects steam continuously by long oil pipe and annular space and realizes vapor chamber and grow; When vapor chamber is grown more than the highest interlayer that multi-lateral well section penetrates, change into and inject solvent and steam system continuously, being communicated with between the vapor chamber that the vapor chamber promoting each multi-lateral well section to be formed at interlayer top and horizontal segment are formed.
(4) solvent owing to injecting in multi-branched well section has molten oil and falls glutinous effect, therefore by solvent and steam mixed water injection, can accelerate the expansion rate in interlayer overhead vapor chamber, quickening be communicated with speed between horizontal segment vapor chamber.After monitoring each interlayer overhead vapor chamber and being communicated with completely between horizontal segment vapor chamber, each multi-lateral well section changes into injects pure steam, can effectively save injection cost.
(5) due to adjacent two SAGD wells between continuous interlayer directly can be formed the crude oil on interlayer top and block, therefore, conventional SAGD or solvent assist the exploitation method of SAGD all can not effectively employ such interlayer, and the employing multi-branched well section that the present invention proposes forces to break through sandwich technique, then can realize such oil reservoir SAGD well effectively employing middle part reserves, realize the object increasing substantially recovery ratio.
Accompanying drawing explanation
The following drawings is only intended to schematically illustrate the present invention and explain, not delimit the scope of the invention.Wherein:
Fig. 1: for solvent in the present invention improves the schematic diagram of the well pattern structure that exploiting thickened oil through steam assisted gravity drainage is hidden;
Fig. 2: be the structural representation of horizontal steam injection well tubing string in the present invention;
Fig. 3: for two SAGD wells adjacent in the present invention are to the tubular column structure schematic diagram adopting interlayer between multi-lateral well section breakthrough well.
Drawing reference numeral:
Steam injection well 1; Producing well 2; Screen casing 11;
Expansible link 12; Solvent injects supervisor 20; Multi-lateral well section 21,22,23;
Steam injection well long oil pipe 30; Producing well long oil pipe 31; Interlayer 41,42,43;
Oil reservoir 5; Monitor well 6;
Detailed description of the invention
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and the specific embodiment of the present invention is described.
As shown in Figure 1, Figure 2 and Figure 3, the present invention proposes the well pattern structure that a kind of solvent improves exploiting thickened oil through steam assisted gravity drainage Tibetan, and described well pattern structure comprises at least one SAGD Horizontal Well to (also having multiple SAGD Horizontal Well pair; Described SAGD Horizontal Well to existing SAGD Horizontal Well pair can be utilized, also can be newly-installed SAGD Horizontal Well to); Described each SAGD Horizontal Well is formed by steam injection well 1 and producing well 2; Steam injection well 1 horizontal segment is positioned at above producing well 2 horizontal segment; Described steam injection well 1 horizontal segment adopts cutting seam sieve tube 11 completion; Be drilled with in steam injection well horizontal segment multi-lateral well section 21,22, multi-lateral well section described in 23(can be drilled with one or more), described each multi-lateral well section is each passed through in the middle part of oil reservoir intraformational bed 41,42,43; Described steam injection well 1 horizontal segment is connected by expansible link 12 with between each multi-lateral well section, and described each multi-lateral well section adopts tail pipe (not shown) completion; At described interlayer 41,42,43 with upper/lower positions, described tail pipe wall does not punch, in described interlayer 41,42,43 and above position thereof, on described tail pipe wall, homogenous linear punches tail pipe end, aperture 3 ~ 6mm, hole density 3 ~ 5/meter; Described tail pipe end is opening and stretches into multi-lateral well section end; In described steam injection well screen casing 11, subordinate enters to reach the first long oil pipe 30 of steam injection well 1 tiptoe, on described first long oil pipe 30 tube wall, corresponding described screen casing 11 is evenly provided with multiple open-work, in the present embodiment, on described first long oil pipe 30 tube wall, the quantity of open-work is 10 ~ 15, and open-work aperture is 6 ~ 10mm; Enter the solvent parallel with the first long oil pipe 30 under in described steam injection well screen casing 11 and inject supervisor 20, described solvent injects supervisor 20 endcapped, and described solvent injects between the tail pipe in supervisor 20 and described each multi-lateral well section and is tightly connected (multi-lateral well section tail tube hanging is prior art) by extension hanger; The second long oil pipe 31 is entered to horizontal segment end under in described producing well 2; At SAGD well to the horizontal segment left and right sides and the correspondence position being positioned at each multi-lateral well section sandwich penetrating disposes straight well monitor well 6, described monitor well 6 is apart from horizontal segment 5 ~ 10 meters.In the present embodiment, the continuous thickness of described oil reservoir 5 intraformational bed is greater than 1.5 meters, and interlayer is greater than 15 meters along horizontal segment direction length, and be greater than 8 meters along horizontal segment direction width, permeability is less than 50 millidarcies; Described multi-lateral well section end-to-end distance is from 1 ~ 2 meter, oil reservoir top circle; In the steam injection well of each SAGD Horizontal Well centering, multi-lateral well hop count amount controls within 4 ~ 6.
From the above mentioned, the present invention utilizes top multiple hole horizontal well (steam injection well) steam injection, recover the oil in bottom light water horizontal well (producing well), in steam injection process, steam enters oil reservoir from steam injection well screen casing, upwards grows vapor chamber, and hot solvent and steam system are injected to be responsible for from solvent and entered interlayer top oil reservoir through tail pipe, accelerate the thermal communication between top oil reservoir and vapor chamber and fluid communication, thus realize forcing to break through interlayer, promote that interlayer top vapor chamber is grown, significantly improve recovery ratio thus.
By lower mask body oil production method the present invention made and further describing and demonstrating.
Embodiment 1
As shown in Figure 1, the present embodiment provides a kind of solvent to improve the method for exploiting thickened oil through steam assisted gravity drainage Tibetan, grow directly over the steam injection well of the major oil reservoir 5 of this heavy crude reservoir and have interlayer 41,42, wherein interlayer 41 thickness 2 meters continuously, along horizontal segment direction length 30 meters, along horizontal segment direction width 15 meters, permeability 25 millidarcy; Interlayer 42 is thickness 1.8 meters continuously, along horizontal segment direction length 27 meters, along horizontal segment direction width 14 meters, and permeability 40 millidarcy, interlayer 41,42 top is respectively 2 meters, 5 meters apart from oil reservoir top circle; The effectively average 15m of oil reservoir 5 thickness.
The method that the solvent that the present embodiment provides improves exploiting thickened oil through steam assisted gravity drainage Tibetan comprises following concrete steps:
(1) multi-lateral well section is determined; According to interlayer recognition result, determine that the multi-lateral well section number of top steam injection horizontal well 1 is 2, be respectively 21,22, as shown in Figure 1;
(2) steam injection well completion; Described steam injection well 1 horizontal segment adopts cutting seam sieve tube 11 completion, described steam injection well horizontal segment (being called for short: main shaft section) is connected (expansible link is existing structure) with utilizing expansible link 12 between each multi-lateral well section 21,22, described multi-lateral well section 21,22 is just each passed through in the middle part of described interlayer 41,42, and it is 1 meter that described multi-lateral well section end-to-end distance pushes up boundary from oil reservoir 5.Described each multi-lateral well section adopts liner completion; At described interlayer 41,42 with upper/lower positions, described tail pipe wall does not punch, in described interlayer 41,42 and above position thereof, on described tail pipe wall, homogenous linear punches tail pipe end, aperture 3mm, hole density 3/meter; Described tail pipe end is opening-like and stretch into each multi-lateral well section end; In described steam injection well screen casing 11, subordinate enters to reach the first long oil pipe 30 of steam injection well tiptoe, on described first long oil pipe 30 tube wall, corresponding described screen casing 11 is evenly provided with multiple open-work, the corresponding described steam injection well screen casing 11 in open-work position is evenly distributed, and open-work hole count is 10, and open-work aperture is 6mm; Enter the solvent parallel with the first long oil pipe under in described steam injection well screen casing 11 and inject supervisor 20, described solvent injects supervisor 20 end and is closed, and described solvent injects between the tail pipe in supervisor 20 and described each multi-lateral well section and adopts extension hanger to realize mechanical connection; Enter not punch under in described producing well 2, the second long oil pipe that end is opening to producing well horizontal segment end, as shown in Figure 3.
(3) straight well monitor well is disposed; Dispose two mouthfuls of straight well monitor wells 6 at SAGD well to the interlayer correspondence position that the horizontal segment left and right sides and each multi-lateral well section penetrate, described monitor well 6 is apart from horizontal segment 5 meters;
(4) SAGD cyclic preheat stages operating parameter; At the production initial stage, steam injection well 1 and producing well 2 all adopt the steam injection of long oil pipe, the mode of ring drainage carries out cyclic preheat, and described cyclic preheat steam injection rate is 60 tons/day, and the described cyclic preheat time is 150 days;
(5) SAGD production phase operating parameter, from the production initial stage, each multi-lateral well section adopts handles up from solvent injection supervisor 20 to the tail pipe heat injection solvent in each multi-lateral well section and steam system, the ratio of the solvent that described note solvent is handled up and steam mixed water injection is mass ratio 1:5, cyclic injection amount (injection rate in each cycle of handling up) is 600 tons, injection rate is 60 tons/day, the wellhead temperature of described injection system (hot solvent and steam system) is vapo(u)rous temperature corresponding under well intake pressure, the described stewing well time is 3 days, described drawing speed is 60 tons/day, the described back production time is 13 days, after steam injection well and producing well cyclic preheat terminate, steam injection well injects steam continuously from the first long oil pipe and annular space, and producing well continuous draining is produced, vapor chamber lifting height is monitored continuously from straight well monitor well, when the vapor chamber of growing from horizontal segment rises gradually, and with each multi-lateral well section in interlayer top handle up solvent-vapor chamber of being formed be communicated with time, stopping is handled up, and changes into and injects supervisor 20 continuously to each multi-lateral well section injection hot solvent and steam system from solvent.When straight well monitor well monitor the corresponding interlayer top of all multi-lateral well sections all grow vapor chamber time, each multi-lateral well section changes into injects pure steam, and this steam injection rate is 100 tons/day; Steam injection well first long oil pipe and annular space continue to inject pure steam continuously.
After adopting the solvent of the present embodiment to improve the method for exploiting thickened oil through steam assisted gravity drainage Tibetan, this SAGD well reaches 95% to horizontal segment vapor chamber development degree, than identical other SAGD well of oil reservoir of same area to raising 35%, assist SAGD well to raising 28% than identical other solvent of oil reservoir of same area; This SAGD well reaches 64% to recovery ratio, than identical other SAGD well of oil reservoir of same area to raising 42%, assists SAGD well to raising 31% than identical other solvent of oil reservoir of same area.
Embodiment 2
The present embodiment provides a kind of solvent to improve the method for exploiting thickened oil through steam assisted gravity drainage Tibetan, as shown in Figure 3, the top oil reservoir 5 of major oil reservoir two adjacent S AGD wells to centre of this heavy crude reservoir grows interlayer 41,43, wherein interlayer 41 thickness 2.5 meters continuously, along horizontal segment direction length 40 meters, along horizontal segment direction width 18 meters, permeability 21 millidarcy; Interlayer 43 is thickness 1.9 meters continuously, along horizontal segment direction length 33 meters, along horizontal segment direction width 15 meters, and permeability 20 millidarcy, interlayer 41,43 top is respectively 4 meters, 6 meters apart from oil reservoir top circle; The effectively average 18m of oil reservoir 5 thickness.
The method that the solvent that the present embodiment provides improves exploiting thickened oil through steam assisted gravity drainage Tibetan comprises following concrete steps:
(1) multi-lateral well section is determined; According to interlayer recognition result, determine that the total multi-lateral well section number of the right steam injection horizontal well of two, top SAGD well is 2, wherein each SAGD well is to one, is respectively 21,23, as shown in Figure 3;
(2) steam injection well completion; Described steam injection well horizontal segment adopts cutting seam sieve tube completion, described steam injection well horizontal segment utilizes expansible link to be connected with between each multi-lateral well section, described multi-lateral well section 21,23 is just through in the middle part of described interlayer 41,43, and described multi-lateral well section end-to-end distance pushes up 2 meters, boundary from oil reservoir 5.Described each multi-lateral well section adopts liner completion; At described interlayer 41,43 with upper/lower positions, described tail pipe wall does not punch, in described interlayer 41,43 and above position thereof, on described tail pipe wall, homogenous linear punches tail pipe end, aperture 6mm, hole density 5/meter; Described tail pipe distal opening also stretches into each multi-lateral well section end; In described steam injection well screen casing 11, subordinate enters to reach the first long oil pipe 30 of steam injection well tiptoe, on described first long oil pipe 30 tube wall, corresponding described screen casing 11 is evenly provided with multiple open-work, the corresponding described steam injection well screen casing 11 in open-work position is evenly distributed, and open-work hole count is 15, and open-work aperture is 10mm; Enter the solvent parallel with the first long oil pipe under in described steam injection well screen casing and inject supervisor 20, described solvent injects supervisor 20 endcapped, and described solvent injects between the tail pipe in supervisor 20 and described each multi-lateral well section and adopts extension hanger to realize mechanical connection; Enter not punch under in described producing well 2, open-ended second long oil pipe is to producing well horizontal segment end;
(3) straight well monitor well is disposed; Dispose straight well monitor well 6 at SAGD well to the interlayer correspondence position that the horizontal segment left and right sides and each multi-lateral well section penetrate, described monitor well 6 is apart from horizontal segment 8 meters;
(4) SAGD cyclic preheat stages operating parameter; At the production initial stage, steam injection well and producing well all adopt the steam injection of long oil pipe, the mode of ring drainage carries out cyclic preheat, and described cyclic preheat steam injection rate is 100 tons/day, and the described cyclic preheat time is 200 days;
(5) SAGD production phase operating parameter; From the production initial stage, each multi-lateral well section adopts handles up from solvent injection supervisor 20 to the tail pipe heat injection solvent in each multi-lateral well section and steam system, the ratio of the solvent that described note solvent is handled up and steam mixed water injection is mass ratio 2:5, cyclic injection amount is 800 tons, injection rate is 80 tons/day, and the wellhead temperature of described injection system is vapo(u)rous temperature corresponding under well intake pressure, and the described stewing well time is 5 days, described drawing speed is 80 tons/day, and the described back production time is 18 days; After steam injection well and producing well cyclic preheat terminate, steam injection well injects steam continuously from the first long oil pipe and annular space, and producing well continuous draining is produced; Vapor chamber lifting height is monitored continuously from straight well monitor well, when the vapor chamber of growing from horizontal segment rises gradually, and with each multi-lateral well section in interlayer top handle up solvent-vapor chamber of being formed be communicated with time, stopping is handled up, and changes into and injects supervisor continuously to each multi-lateral well section injection hot solvent and steam system from solvent.When straight well monitor well monitor the corresponding interlayer top of all multi-lateral well sections all grow vapor chamber time, each multi-lateral well section changes into injects pure steam, and this steam injection rate is 150 tons/day; Steam injection well first long oil pipe and annular space continue to inject pure steam continuously.
After adopting the solvent of the present embodiment to improve the method for exploiting thickened oil through steam assisted gravity drainage Tibetan, between well, interlayer 41,43 top oil reservoir is effectively employed, this adjacent S AGD well reaches 88% to horizontal segment vapor chamber development degree, than identical other SAGD well of oil reservoir of same area to raising 33%, assist SAGD well to raising 29% than identical other solvent of oil reservoir of same area; This SAGD well reaches 60% to recovery ratio, than identical other SAGD well of oil reservoir of same area to raising 35%, assists SAGD well to raising 28% than identical other solvent of oil reservoir of same area.
The present invention has following technical advantage:
(1) effect is blocked due to interlayer, in SAGD development process, the vapor chamber of the horizontal segment that interlayer is corresponding is difficult to upwards grow, first exploitation method provided by the present invention adopts multi-branched well section to penetrate the interlayer that continuous thickness is comparatively large, distribution is wider, by special completion tubular column structure, inject solvent and steam system to interlayer top, force to promote that vapor chamber is grown;
(2) in described steam injection well screen casing, subordinate enters to reach the punching long oil pipe of steam injection well tiptoe, can in steam injection process, oil reservoir is entered along steam injection well horizontal segment screen casing, under avoiding long oil pipe not punching situation, the admission of the steam injection well water section of putting down end is too much, and the admission of steam injection well horizontal segment mid portion oil reservoir is less, vapor chamber is caused to grow poor situation.
(3) the present invention adopts parameter by special note, in conjunction with straight well monitoring, realizes horizontal segment and evenly employs and evenly grow this purpose with vapor chamber.Specifically, early stage each multi-lateral well section is handled up and is promoted interlayer top reservoir producing and fall glutinous, and forms vapor chamber small-sized one by one at interlayer top; Meanwhile, steam injection well injects steam continuously by long oil pipe and annular space and realizes vapor chamber and grow; When the vapor chamber of growing from horizontal segment rises gradually, and with each multi-lateral well section in interlayer top handle up solvent-vapor chamber of being formed be communicated with time, change into and continuously inject solvent and steam system, being communicated with between the vapor chamber that the vapor chamber promoting each multi-lateral well section to be formed at interlayer top and horizontal segment are formed.
(4) solvent owing to injecting in multi-branched well section has molten oil and falls glutinous effect, therefore by solvent and steam mixed water injection, can accelerate the expansion rate in interlayer overhead vapor chamber, quickening be communicated with speed between horizontal segment vapor chamber.After monitoring each interlayer overhead vapor chamber and being communicated with completely between horizontal segment vapor chamber, each multi-lateral well section changes into injects pure steam, can effectively save injection cost.
(5) due to adjacent two SAGD wells between continuous interlayer directly can be formed the crude oil on interlayer top and block, therefore, conventional SAGD or solvent assist the exploitation method of SAGD all can not effectively employ such interlayer, and the employing multi-branched well section that the present invention proposes forces to break through sandwich technique, then can realize such oil reservoir SAGD well effectively employing middle part reserves, realize the object increasing substantially recovery ratio.
The foregoing is only the schematic detailed description of the invention of the present invention, and be not used to limit scope of the present invention.Any those skilled in the art, equivalent variations done under the prerequisite not departing from design of the present invention and principle and amendment, all should belong to the scope of protection of the invention.
Claims (12)
1. solvent improves the method that exploiting thickened oil through steam assisted gravity drainage is hidden, and said method comprising the steps of:
(1) well pattern is set in oil reservoir region; Described well pattern comprises at least one SAGD Horizontal Well pair; Described SAGD Horizontal Well is formed by steam injection well and producing well; The steam injection well water section of putting down is positioned at above producing well horizontal segment;
(2) according to oil reservoir region oil reservoir intraformational bed recognition result, determine the multi-lateral well section number of top steam injection horizontal well and be drilled with described multi-lateral well section; Described multi-lateral well section is through in the middle part of described interlayer;
(3) described steam injection well horizontal segment adopts cutting seam sieve tube completion, and described steam injection well horizontal segment is connected by expansible link with between each multi-lateral well section, and described each multi-lateral well section adopts liner completion; At described interlayer with upper/lower positions, described tail pipe wall does not punch, in described interlayer and the above position of interlayer, on described tail pipe wall, homogenous linear punches tail pipe end, aperture 3 ~ 6mm, hole density 3 ~ 5/meter; Described tail pipe end is opening and stretches into multi-lateral well section end;
(4) in described steam injection well screen casing, subordinate enters to reach the first long oil pipe of steam injection well tiptoe, and on described first long oil tube wall, corresponding described screen casing is evenly provided with multiple open-work;
(5) enter the solvent parallel with the first long oil pipe under in described steam injection well screen casing to inject and be responsible for, described solvent injects supervisor's endcapped, and described solvent injects between the tail pipe in supervisor and described each multi-lateral well section and adopts extension hanger to realize mechanical connection;
(6) the second long oil pipe is entered to horizontal segment end under in described producing well;
(7) at SAGD well to the horizontal segment left and right sides and the correspondence position being positioned at each multi-lateral well section sandwich penetrating disposes straight well monitor well;
(8) at the production initial stage, steam injection well and producing well all adopt the steam injection of long oil pipe, the mode of ring drainage carries out cyclic preheat;
(9) from the production initial stage, each multi-lateral well section adopts handles up from solvent injection supervisor to the tail pipe heat injection solvent in each multi-lateral well section and steam system;
(10) after steam injection well and producing well cyclic preheat terminate, steam injection well injects steam continuously from the first long oil pipe and annular space, and producing well continuous draining is produced;
(11) vapor chamber lifting height is monitored continuously from straight well monitor well, when the vapor chamber of growing from horizontal segment rises gradually, and with each multi-lateral well section in interlayer top handle up solvent-vapor chamber of being formed be communicated with time, stopping is handled up, and changes into and injects supervisor continuously to each multi-lateral well section injection hot solvent and steam system from solvent;
(12) when straight well monitor well monitor the corresponding interlayer top of all multi-lateral well sections all grow vapor chamber time, each multi-lateral well section changes into injects pure steam; Steam injection well first long oil pipe and annular space continue to inject pure steam continuously.
2. solvent as claimed in claim 1 improves the method that exploiting thickened oil through steam assisted gravity drainage is hidden, it is characterized in that: in described step (2), the continuous thickness of described interlayer is greater than 1.5 meters, interlayer is greater than 15 meters along horizontal segment direction length, 8 meters are greater than along horizontal segment direction width, permeability is less than 50 millidarcies, and interlayer top is greater than 2 meters apart from oil reservoir top circle; Described multi-lateral well section end-to-end distance is from 1 ~ 2 meter, oil reservoir top circle; In the steam injection well of each SAGD Horizontal Well centering, multi-lateral well hop count amount controls at 1 ~ 6.
3. solvent as claimed in claim 1 improves the method that exploiting thickened oil through steam assisted gravity drainage is hidden, it is characterized in that: before described step (2), according to SAGD Horizontal Well to the core data of getting in drilling process, with brill well logging, well log interpretation data, identify that this SAGD Horizontal Well is to the thickness of interlayer in the oil reservoir of place, type, spread scope, and carry out the permeability test of getting core interlayer, determine its permeability.
4. solvent as claimed in claim 1 improves the method that exploiting thickened oil through steam assisted gravity drainage is hidden, and it is characterized in that: in described step (7), described monitor well distance horizontal segment 5 ~ 10 meters.
5. solvent as claimed in claim 1 improves the method that exploiting thickened oil through steam assisted gravity drainage is hidden, it is characterized in that: in described step (8), described cyclic preheat steam injection rate is 60 ~ 100 tons/day, and the described cyclic preheat time is 150 ~ 200 days.
6. solvent as claimed in claim 1 improves the method that exploiting thickened oil through steam assisted gravity drainage is hidden, it is characterized in that: in described step (9), the ratio that described heat injection solvent and steam system carry out solvent and the steam mixed water injection handled up is mass ratio 1:5 ~ 2:5; Cyclic injection amount is 600 ~ 800 tons, and injection rate is 60 ~ 80 tons/day, and the wellhead temperature of injection system is vapo(u)rous temperature corresponding under well intake pressure, and the stewing well time is 3 ~ 5 days, and drawing speed is 60 ~ 80 tons/day, and the back production time is 13 ~ 18 days.
7. solvent as claimed in claim 1 improves the method that exploiting thickened oil through steam assisted gravity drainage is hidden, it is characterized in that: in described step (11), described continuously to each multi-lateral well section inject hot solvent and the ratio of steam system be hot solvent with quality of steam than 1:5 ~ 2:5, the wellhead temperature of injection system is vapo(u)rous temperature corresponding under well intake pressure, and total injection rate is 40 ~ 80 tons/day.
8. solvent as claimed in claim 1 improves the method that exploiting thickened oil through steam assisted gravity drainage is hidden, and it is characterized in that: in described step (12), it is 100 ~ 150 tons/day that described each multi-lateral well section changes the speed injecting pure steam into.
9. solvent improves the well pattern structure that exploiting thickened oil through steam assisted gravity drainage is hidden, and described well pattern comprises at least one SAGD Horizontal Well pair; Described SAGD Horizontal Well is formed by steam injection well and producing well; The steam injection well water section of putting down is positioned at above producing well horizontal segment; It is characterized in that: described steam injection well horizontal segment adopts cutting seam sieve tube completion; In steam injection well horizontal segment, be drilled with multi-lateral well section, described each multi-lateral well section is through in the middle part of oil reservoir intraformational bed; Described steam injection well horizontal segment is connected by expansible link with between each multi-lateral well section, and described each multi-lateral well section adopts liner completion; At described interlayer with upper/lower positions, described tail pipe wall does not punch, in described interlayer and the above position of interlayer, on described tail pipe wall, homogenous linear punches tail pipe end, aperture 3 ~ 6mm, hole density 3 ~ 5/meter; Described tail pipe end is opening and stretches into multi-lateral well section end; In described steam injection well screen casing, subordinate enters to reach the first long oil pipe of steam injection well tiptoe, and on described first long oil tube wall, corresponding described screen casing is evenly provided with multiple open-work; Enter the solvent parallel with the first long oil pipe under in described steam injection well screen casing to inject and be responsible for, described solvent injects supervisor's endcapped, and described solvent injection is responsible for and is tightly connected by extension hanger between the tail pipe in described each multi-lateral well section; The second long oil pipe is entered to horizontal segment end under in described producing well; At SAGD well to the horizontal segment left and right sides and the correspondence position being positioned at each multi-lateral well section sandwich penetrating disposes straight well monitor well.
10. solvent as claimed in claim 9 improves the well pattern structure that exploiting thickened oil through steam assisted gravity drainage is hidden, it is characterized in that: the continuous thickness of described oil reservoir intraformational bed is greater than 1.5 meters, interlayer is greater than 15 meters along horizontal segment direction length, 8 meters are greater than along horizontal segment direction width, permeability is less than 50 millidarcies, and interlayer top is greater than 2 meters apart from oil reservoir top circle; Described multi-lateral well section end-to-end distance is from 1 ~ 2 meter, oil reservoir top circle; In the steam injection well of each SAGD Horizontal Well centering, multi-lateral well hop count amount controls at 1 ~ 6.
11. solvents as claimed in claim 9 improve the well pattern structure that exploiting thickened oil through steam assisted gravity drainage is hidden, and it is characterized in that: on described first long oil tube wall, the quantity of open-work is 10 ~ 15, and open-work aperture is 6 ~ 10mm.
12. solvents as claimed in claim 9 improve the well pattern structure that exploiting thickened oil through steam assisted gravity drainage is hidden, and it is characterized in that: described monitor well distance horizontal segment 5 ~ 10 meters.
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