CN103615224A - Method and well network structure for improving steam assisted gravity drainage for extracting heavy oil reservoirs by aid of solvents - Google Patents
Method and well network structure for improving steam assisted gravity drainage for extracting heavy oil reservoirs by aid of solvents Download PDFInfo
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Abstract
The invention discloses a method and a well network for improving steam assisted gravity drainage for extracting heavy oil reservoirs by the aid of solvents. The well network comprises SAGD (steam assisted gravity drainage) horizontal well pairs; horizontal sections of steam injection wells are subjected to well completion by the aid of slotted screen pipes; branched well sections are drilled in the horizontal sections of the steam injection wells and penetrate the middles of inner sandwich layers in oil layers; the various branched well sections are subjected to well completion by the aid of tail pipes; first long oil pipes which extend to toes of the steam injection wells descend into screen pipes of the steam injection wells; solvent injection main pipes which are parallel to the first long oil pipes descend into the screen pipes of the steam injection wells and are hermetically connected with the tail pipes in the various branched well sections by tail pipe hangers; second long oil pipes descend into production wells and reach the tail ends of horizontal sections of the production wells; vertical monitoring wells are further deployed in the well network. The method and the well network have the advantages that steam flows into the oil layers to upwardly develop steam cavities, and the hot solvents and steam mixed systems flow into the oil layers on the upper portions of the sandwich layers from the main pipes via the tail pipes, so that heat communication and fluid communication among the oil layers and the steam cavities can be accelerated, the sandwich layers can be forcedly broken through, development of the steam cavities on the upper portions of the sandwich layers can be promoted, and the recovery efficiency can be greatly improved.
Description
Technical field
The invention relates to the production technique of heavy crude reservoir in a kind of oil field, relate in particular to a kind of solvent and improve method and the well pattern structure that exploiting thickened oil through steam assisted gravity drainage is hidden.
Background technology
SAGD (Steam Assisted Gravity Drainage, being called for short SAGD) technology is that Canadian Bulter in 1978 invents, in the Liaohe Oil Field of Canadian oil-sand mining area, China, the heavy crude reservoir on the ground such as Xinjiang Oilfield obtained successful Application; Its principle is to dispose upper and lower stacked horizontal well pair at same oil reservoir, in the steam injection well of top, inject high-quality steam, steam forms vapor chamber because density is far smaller than the crude oil onlap that makes progress in stratum, continuous injection along with steam, vapor chamber constantly makes progress and sideways expansion, with the crude oil generation interchange of heat in oil reservoir; Heated viscosity of crude reduces, flows downward under Action of Gravity Field with condensed water, and extraction from the horizontal production well of oil reservoir bottom.
Solvent assisted gravity drainage (being called for short: solvent is assisted SAGD) technology is the technology developing on SAGD basis.Its principle is to adopt 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 (are called for short: solvent) viscous crude is had to good dissolution, after dissolving viscous crude, can reduce Viscosity of Heavy Crude Oil, improve viscous crude mobility; Add the glutinous effect of heat drop that adds of steam itself, the mixed system of above-mentioned light paraffins solvent and steam can accelerate viscous crude and fall glutinously, improves vapor chamber expansion rate and viscous crude flowing velocity, thus raising draining speed and output.
Because the heavy crude reservoir of China all belongs to continental deposit environment, in oil reservoir, grow and have a large amount of shales or upgrading interlayer, when interlayer distributes in flakes or the vertical stacked vapor chamber that causes mutually cannot upwards be expanded in oil reservoir, or when the too large to such an extent as to steam of thickness of interlayer cannot be broken through, the oil reservoir on interlayer top often cannot be realized effectively and employing, thereby has lost a large amount of reserves; Cause vapor chamber to decline too early simultaneously, shortened 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 is grown scale less than 70% of the horizontal section length of the horizontal well group of SAGD.Because the auxiliary SAGD technology of solvent adopts the casing programme identical with steam assisted gravity drainage techniques, its limitation is, can only accelerate vapor chamber draining speed, for a large amount of oil reservoirs of growing of interlayer, equally cannot the section of improving the standard development degree, cause reserves loss larger.
For interlayer SAGD heavy crude reservoir stable, that distribute in flakes, also do not have effective vapor chamber to break through the exploitation method that interlayer is evenly grown at present.
Thus, the inventor, by means of being engaged in experience and the practice of relevant industries for many years, proposing a kind of solvent and improves method and the well pattern structure that exploiting thickened oil through steam assisted gravity drainage is hidden, to overcome the defect of prior art.
Summary of the invention
The object of the present invention is to provide a kind of solvent to improve method and well pattern structure that exploiting thickened oil through steam assisted gravity drainage is hidden, the heavy crude reservoir of growing in a large number, distributing in flakes for interlayer utilizes multi-branched well to inject light paraffins solvent, realize steam and break through interlayer, promote vapor chamber evenly to grow, significantly improve thus recovery ratio.
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) in oil reservoir region, well pattern is set; Described well pattern comprises at least one SAGD Horizontal Well pair; Described SAGD Horizontal Well is to consisting of steam injection well and producing well; The flat section of steam injection well water is positioned at producing well horizontal segment top;
(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 described interlayer middle part;
(3) described steam injection well horizontal segment adopts cutting seam sieve tube completion, is connected described each multi-lateral well section employing liner completion between described steam injection well horizontal segment and each multi-lateral well section by expansible link; At described interlayer, with upper/lower positions, on described tail pipe wall, do not punch, in described interlayer and the above position of interlayer, on described tail pipe wall, evenly tail pipe end, aperture 3～6mm, 3～5/meter of hole density are arrived in linear punching; Described tail pipe end is opening and stretches into multi-lateral well section end;
(4) described steam injection well screen casing inside is lowered to the first long oil pipe that reaches steam injection well tiptoe, and on described the first long oil tube wall, corresponding described screen casing is evenly provided with a plurality of open-works;
(5) in described steam injection well screen casing, be lowered to the solvent parallel with the first long oil pipe and inject supervisor, 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) in described producing well, be lowered to the second long oil pipe to horizontal segment end;
(7) at SAGD well, straight well monitor well is disposed in the horizontal segment left and right sides and the correspondence position that is positioned at each multi-lateral well section sandwich penetrating;
(8), at the production initial stage, steam injection well and producing well all adopt the mode of the steam injection of long oil pipe, ring drainage to carry out cyclic preheat;
(9), from the production initial stage, each multi-lateral well section adopts from solvent injection supervisor handles up to tail pipe heat injection solvent and steam system in each multi-lateral well section;
(10) after steam injection well and producing well cyclic preheat finish, steam injection well is from the first long oil pipe and the continuous steam injection of annular space, and producing well continuous draining is produced;
(11) from straight well monitor well continuous monitoring vapor chamber lifting height, when the vapor chamber of growing from horizontal segment rises gradually, and handle up solvent-vapor chamber of forming while being communicated with each multi-lateral well section of interlayer top, stop handling up, change into from solvent and inject supervisor continuously to each multi-lateral well section injection hot solvent and steam system;
(12) when straight well monitor well monitors the corresponding interlayers of all multi-lateral well sections top and all grows vapor chamber, each multi-lateral well section changes into injects pure steam; Steam injection well the first long oil pipe and annular space continue to inject continuously pure steam.
In a preferred embodiments 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, along horizontal segment direction width, be greater than 8 meters, permeability is less than 50 millidarcies, and interlayer top is greater than 2 meters apart from circle, oil reservoir top; Described multi-lateral well section end-to-end distance is from 1～2 meter, circle, oil reservoir top; In the steam injection well of each SAGD Horizontal Well centering, multi-lateral well hop count amount is controlled at 1～6.
In a preferred embodiments of the present invention, in described step (2) before, according to SAGD Horizontal Well to the core data of getting in drilling process, with boring well logging, well log interpretation data, identify this SAGD Horizontal Well 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 preferred embodiments of the present invention, in described step (7), described monitor well is apart from 5～10 meters of horizontal segments.
In a preferred embodiments 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 preferred embodiments of the present invention, in described step (9), the solvent that described notes solvent is handled up and the ratio of steam mixed water injection are 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 preferred embodiments of the present invention, in described step (11), the ratio of the hot solvent of described continuous injection and 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 preferred embodiments of the present invention, in described step (12), the speed that described each multi-lateral well section changes the pure steam of injection into is 100～150 tons/day.
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 to consisting of steam injection well and producing well; The flat section of steam injection well water is positioned at producing well horizontal segment top; 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 oil reservoir intraformational bed middle part; Between described steam injection well horizontal segment and each multi-lateral well section, by expansible link, be connected, described each multi-lateral well section adopts liner completion; At described interlayer, with upper/lower positions, on described tail pipe wall, do not punch, in described interlayer and the above position of interlayer, on described tail pipe wall, evenly tail pipe end, aperture 3～6mm, 3～5/meter of hole density are arrived in linear punching; Described tail pipe end is opening and stretches into multi-lateral well section end; Described steam injection well screen casing inside is lowered to the first long oil pipe that reaches steam injection well tiptoe, and on described the first long oil tube wall, corresponding described screen casing is evenly provided with a plurality of open-works; In described steam injection well screen casing, be lowered to the solvent parallel with the first long oil pipe and inject supervisor, described solvent injects supervisor's endcapped, and described solvent injects between the tail pipe in supervisor and described each multi-lateral well section and is tightly connected by extension hanger; In described producing well, be lowered to the second long oil pipe to horizontal segment end; At SAGD well, straight well monitor well is disposed in the horizontal segment left and right sides and the correspondence position that is positioned at each multi-lateral well section sandwich penetrating.
In a preferred embodiments 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, along horizontal segment direction width, is greater than 8 meters, permeability is less than 50 millidarcies, and interlayer top is greater than 2 meters apart from circle, oil reservoir top; Described multi-lateral well section end-to-end distance is from 1～2 meter, circle, oil reservoir top; In the steam injection well of each SAGD Horizontal Well centering, multi-lateral well hop count amount is controlled at 1～6.
In a preferred embodiments of the present invention, on described the first long oil tube wall, the quantity of open-work is 10～15, and open-work aperture is 6～10mm.
In a preferred embodiments of the present invention, described monitor well is apart from 5～10 meters of horizontal segments.
From the above mentioned, the present invention utilizes top multi-branched horizontal well (steam injection well) steam injection, bottom light water horizontal well (producing well) to recover the oil, 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 supervisor from solvent and entered interlayer top oil reservoir through tail pipe, accelerate thermal communication and fluid communication between top oil reservoir and vapor chamber, thereby realize, force to break through interlayer, promote interlayer top vapor chamber to grow, significantly improve thus recovery ratio.
The present invention has following technical advantage:
(1) due to the effect of blocking of 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 large, distribution is wider, by special completion tubular column structure, to interlayer top, inject solvent and steam system, force to promote vapor chamber to be grown;
(2) described steam injection well screen casing inside is lowered to the punching long oil pipe that reaches steam injection well tiptoe, can be in steam injection process, along steam injection well horizontal segment screen casing, enter oil reservoir, avoid in not punching situation of long oil pipe the admission of the flat section of steam injection well water end too much, and the admission of steam injection well horizontal segment mid portion oil reservoir is less, cause vapor chamber to grow poor situation.
(3) the present invention adopts parameter by special notes, in conjunction with straight well monitoring, realizes horizontal segment and evenly employs with vapor chamber and evenly grow this purpose.Particularly, each multi-lateral well section is handled up and is promoted interlayer top oil reservoir employ and fall glutinously in early days, and at interlayer top, forms small-sized one by one vapor chamber; Meanwhile, steam injection well is realized vapor chamber by long oil pipe and the continuous steam injection of annular space and is grown; When vapor chamber, grow the highest interlayer that multi-lateral well section penetrates when above, change continuous injection solvent and steam system into, promote being communicated with between vapor chamber that vapor chamber that each multi-lateral well section has formed at interlayer top forms with horizontal segment.
(4) because the solvent injecting in multi-branched well section has molten oil, fall glutinous effect, therefore by solvent and steam mixed water injection, can accelerate the expansion rate in interlayer overhead vapor chamber, between quickening and horizontal segment vapor chamber, be communicated with speed.After monitoring and being communicated with completely between each interlayer overhead vapor chamber and 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 can be directly the crude oil on interlayer top be formed and is blocked, therefore, the exploitation method of the auxiliary SAGD of conventional SAGD or solvent all can not effectively be employed such interlayer, and the employing multi-branched well section that the present invention proposes forces to break through sandwich technique, can realize such oil reservoir SAGD well to effectively the employing of middle part reserves, realize the object that increases substantially recovery ratio.
Accompanying drawing explanation
The following drawings is only intended to the present invention to schematically illustrate 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 hides;
Fig. 2: be the structural representation of horizontal steam injection well tubing string in the present invention;
Fig. 3: for adjacent two SAGD wells in the present invention are to adopting the tubular column structure schematic diagram of interlayer between multi-lateral well section breakthrough well.
Drawing reference numeral:
Steam injection well 1; Producing well 2; Screen casing 11;
Steam injection well long oil pipe 30; Producing well long oil pipe 31; Interlayer 41,42,43;
The specific embodiment
For technical characterictic of the present invention, object and effect being had more clearly, understand, now contrast accompanying drawing explanation the specific embodiment of the present invention.
As shown in Figure 1, Figure 2 and Figure 3, the present invention proposes a kind of solvent and improves the well pattern structure that exploiting thickened oil through steam assisted gravity drainage is hidden, and described well pattern structure comprises that at least one SAGD Horizontal Well is to (also having a plurality of SAGD Horizontal Wells pair; Described SAGD Horizontal Well be to utilizing existing SAGD Horizontal Well pair, can be also newly-installed SAGD Horizontal Well to); Described each SAGD Horizontal Well is to consisting of steam injection well 1 and producing well 2; Steam injection well 1 horizontal segment is positioned at producing well 2 horizontal segment tops; Described steam injection well 1 horizontal segment adopts cutting seam sieve tube 11 completions; In steam injection well horizontal segment, being drilled with multi-lateral well section described in multi-lateral well section 21,22,23(can be drilled with one or more), described each multi-lateral well section is respectively through oil reservoir intraformational bed 41,42,43 middle parts; Between described steam injection well 1 horizontal segment and each multi-lateral well section, by expansible link 12, be connected, described each multi-lateral well section adopts tail pipe (not shown) completion; At described interlayer 41,42,43, with upper/lower positions, on described tail pipe wall, do not punch, in described interlayer 41,42,43 and above position thereof, on described tail pipe wall, evenly tail pipe end, aperture 3～6mm, 3～5/meter of hole density are arrived in linear punching; Described tail pipe end is opening and stretches into multi-lateral well section end; Described steam injection well screen casing 11 inside are lowered to the first long oil pipe 30 that reaches steam injection well 1 tiptoe, on described the first long oil pipe 30 tube walls, corresponding described screen casing 11 is evenly provided with a plurality of open-works, in the present embodiment, on described the first long oil pipe 30 tube walls, the quantity of open-work is 10～15, and open-work aperture is 6～10mm; In described steam injection well screen casing 11, be lowered to the solvent parallel with the first long oil pipe 30 and inject supervisor 20, described solvent injects supervisor's 20 endcappeds, and described solvent injects between the tail pipe in supervisor 20 and described each multi-lateral well section by extension hanger be tightly connected (multi-lateral well section tail tube hanging is prior art); In described producing well 2, be lowered to the second long oil pipe 31 to horizontal segment end; At SAGD well, straight well monitor well 6 is disposed in the horizontal segment left and right sides and the correspondence position that is positioned at each multi-lateral well section sandwich penetrating, described monitor well 6 is apart from 5～10 meters of horizontal segments.In the present embodiment, the continuous thickness of described oil reservoir 5 intraformational beds is greater than 1.5 meters, and interlayer is greater than 15 meters along horizontal segment direction length, along horizontal segment direction width, is greater than 8 meters, and permeability is less than 50 millidarcies; Described multi-lateral well section end-to-end distance is from 1～2 meter, circle, oil reservoir top; In the steam injection well of each SAGD Horizontal Well centering, multi-lateral well hop count amount is controlled in 4～6.
From the above mentioned, the present invention utilizes top multi-branched horizontal well (steam injection well) steam injection, bottom light water horizontal well (producing well) to recover the oil, 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 supervisor from solvent and entered interlayer top oil reservoir through tail pipe, accelerate thermal communication and fluid communication between top oil reservoir and vapor chamber, thereby realize, force to break through interlayer, promote interlayer top vapor chamber to grow, significantly improve thus recovery ratio.
By lower mask body oil production method, the present invention is made and being further described and demonstrated.
Embodiment 1
As shown in Figure 1, the present embodiment provides a kind of solvent to improve the method that exploiting thickened oil through steam assisted gravity drainage is hidden, directly over the steam injection well of the major oil reservoir 5 of this heavy crude reservoir, grow and have interlayer 41,42, wherein the continuous thickness of interlayer 41 is 2 meters, along 30 meters of horizontal segment direction length, along 15 meters of horizontal segment direction width, permeability 25 millidarcies; 1.8 meters of the continuous thickness of interlayer 42, along 27 meters of horizontal segment direction length, along 14 meters of horizontal segment direction width, permeability 40 millidarcies, interlayer 41,42 tops are respectively 2 meters, 5 meters apart from circle, oil reservoir top; 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) determine multi-lateral well section; 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 completions, described steam injection well horizontal segment (is called for short: main shaft section) with between each multi-lateral well section 21,22 utilize expansible link 12 to be connected (expansible link is existing structure), described multi-lateral well section 21,22 is just respectively through described interlayer 41,42 middle parts, and described multi-lateral well section end-to-end distance is 1 meter from oil reservoir 5 circles, top.Described each multi-lateral well section adopts liner completion; At described interlayer 41,42, with upper/lower positions, on described tail pipe wall, do not punch, in described interlayer 41,42 and above position thereof, on described tail pipe wall, evenly tail pipe end, 3/meter of 3mm， hole, aperture density are arrived in linear punching; Described tail pipe end is opening-like and stretch into each multi-lateral well section end; Described steam injection well screen casing 11 inside are lowered to the first long oil pipe 30 that reaches steam injection well tiptoe, on described the first long oil pipe 30 tube walls, corresponding described screen casing 11 is evenly provided with a plurality of open-works, 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; In described steam injection well screen casing 11, be lowered to the solvent parallel with the first long oil pipe and inject supervisor 20, described solvent injects supervisor's 20 ends 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; In described producing well 2, be lowered to the second long oil pipe that punching, end be not opening to producing well horizontal segment end, as shown in Figure 3.
(3) straight well monitor well is disposed; The interlayer correspondence position horizontal segment left and right sides and each multi-lateral well section being penetrated at SAGD well is disposed two mouthfuls of straight well monitor wells 6, and described monitor well 6 is apart from 5 meters of horizontal segments;
(4) SAGD cyclic preheat stages operating parameter; At the production initial stage, steam injection well 1 all adopts the mode of the steam injection of long oil pipe, ring drainage to carry out cyclic preheat with producing well 2, 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 from solvent injection supervisor 20 handles up to tail pipe heat injection solvent and steam system in each multi-lateral well section, the solvent that described notes solvent is handled up and the ratio of steam mixed water injection are 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 finish, steam injection well is from the first long oil pipe and the continuous steam injection of annular space, and producing well continuous draining is produced, from straight well monitor well continuous monitoring vapor chamber lifting height, when the vapor chamber of growing from horizontal segment rises gradually, and handle up solvent-vapor chamber of forming while being communicated with each multi-lateral well section of interlayer top, stop handling up, change into from solvent and inject supervisor 20 continuously to each multi-lateral well section injection hot solvent and steam system.When straight well monitor well monitors the corresponding interlayers of all multi-lateral well sections top and all grows vapor chamber, each multi-lateral well section changes into injects pure steam, and this steam injection rate is 100 tons/day; Steam injection well the first long oil pipe and annular space continue to inject continuously pure steam.
Adopt the solvent of the present embodiment to improve after 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 other SAGD well of the identical oil reservoir of same area, to improving 35%, than other solvent of the identical oil reservoir of same area, assist SAGD well to improving 28%; This SAGD well reaches 64% to recovery ratio, than other SAGD well of the identical oil reservoir of same area, to improving 42%, than other solvent of the identical oil reservoir of same area, assists SAGD well to improving 31%.
The present embodiment provides a kind of solvent to improve the method that exploiting thickened oil through steam assisted gravity drainage is hidden, as shown in Figure 3, two adjacent S AGD wells of major oil reservoir of this heavy crude reservoir are grown interlayer 41,43 to middle top oil reservoir 5, wherein the continuous thickness of interlayer 41 is 2.5 meters, along 40 meters of horizontal segment direction length, along 18 meters of horizontal segment direction width, permeability 21 millidarcies; 1.9 meters of the continuous thickness of interlayer 43, along 33 meters of horizontal segment direction length, along 15 meters of horizontal segment direction width, permeability 20 millidarcies, interlayer 41,43 tops are respectively 4 meters, 6 meters apart from circle, oil reservoir top; 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) determine multi-lateral well section; 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, 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, between described steam injection well horizontal segment and each multi-lateral well section, utilize expansible link to be connected, described multi-lateral well section 21,23 is just through described interlayer 41,43 middle parts, and described multi-lateral well section end-to-end distance is from 2 meters, oil reservoir 5 circle, top.Described each multi-lateral well section adopts liner completion; At described interlayer 41,43, with upper/lower positions, on described tail pipe wall, do not punch, in described interlayer 41,43 and above position thereof, on described tail pipe wall, evenly tail pipe end, 5/meter of 6mm， hole, aperture density are arrived in linear punching; Described tail pipe end openings also stretches into each multi-lateral well section end; Described steam injection well screen casing 11 inside are lowered to the first long oil pipe 30 that reaches steam injection well tiptoe, on described the first long oil pipe 30 tube walls, corresponding described screen casing 11 is evenly provided with a plurality of open-works, 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; In described steam injection well screen casing, be lowered to the solvent parallel with the first long oil pipe and inject supervisor 20, described solvent injects supervisor's 20 endcappeds, 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; In described producing well 2, be not lowered to punching, open-ended the second long oil pipe to producing well horizontal segment end;
(3) straight well monitor well is disposed; The interlayer correspondence position horizontal segment left and right sides and each multi-lateral well section being penetrated at SAGD well is disposed straight well monitor well 6, and described monitor well 6 is apart from 8 meters of horizontal segments;
(4) SAGD cyclic preheat stages operating parameter; At the production initial stage, steam injection well and producing well all adopt the mode of the steam injection of long oil pipe, ring drainage to carry 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 from solvent injection supervisor 20 handles up to tail pipe heat injection solvent and steam system in each multi-lateral well section, the solvent that described notes solvent is handled up and the ratio of steam mixed water injection are 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 finish, steam injection well is from the first long oil pipe and the continuous steam injection of annular space, and producing well continuous draining is produced; From straight well monitor well continuous monitoring vapor chamber lifting height, when the vapor chamber of growing from horizontal segment rises gradually, and handle up solvent-vapor chamber of forming while being communicated with each multi-lateral well section of interlayer top, stop handling up, change into from solvent and inject supervisor continuously to each multi-lateral well section injection hot solvent and steam system.When straight well monitor well monitors the corresponding interlayers of all multi-lateral well sections top and all grows vapor chamber, each multi-lateral well section changes into injects pure steam, and this steam injection rate is 150 tons/day; Steam injection well the first long oil pipe and annular space continue to inject continuously pure steam.
Adopt the solvent of the present embodiment to improve after the method for exploiting thickened oil through steam assisted gravity drainage Tibetan, between well, interlayer 41,43 top oil reservoirs are effectively employed, this adjacent S AGD well reaches 88% to horizontal segment vapor chamber development degree, than other SAGD well of the identical oil reservoir of same area, to improving 33%, than other solvent of the identical oil reservoir of same area, assist SAGD well to improving 29%; This SAGD well reaches 60% to recovery ratio, than other SAGD well of the identical oil reservoir of same area, to improving 35%, than other solvent of the identical oil reservoir of same area, assists SAGD well to improving 28%.
The present invention has following technical advantage:
(1) due to the effect of blocking of 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 large, distribution is wider, by special completion tubular column structure, to interlayer top, inject solvent and steam system, force to promote vapor chamber to be grown;
(2) described steam injection well screen casing inside is lowered to the punching long oil pipe that reaches steam injection well tiptoe, can be in steam injection process, along steam injection well horizontal segment screen casing, enter oil reservoir, avoid in not punching situation of long oil pipe the admission of the flat section of steam injection well water end too much, and the admission of steam injection well horizontal segment mid portion oil reservoir is less, cause vapor chamber to grow poor situation.
(3) the present invention adopts parameter by special notes, in conjunction with straight well monitoring, realizes horizontal segment and evenly employs with vapor chamber and evenly grow this purpose.Particularly, each multi-lateral well section is handled up and is promoted interlayer top oil reservoir employ and fall glutinously in early days, and at interlayer top, forms small-sized one by one vapor chamber; Meanwhile, steam injection well is realized vapor chamber by long oil pipe and the continuous steam injection of annular space and is grown; When the vapor chamber of growing from horizontal segment rises gradually, and handle up solvent-vapor chamber of forming while being communicated with each multi-lateral well section of interlayer top, change continuous injection solvent and steam system into, promote being communicated with between vapor chamber that vapor chamber that each multi-lateral well section formed at interlayer top forms with horizontal segment.
(4) because the solvent injecting in multi-branched well section has molten oil, fall glutinous effect, therefore by solvent and steam mixed water injection, can accelerate the expansion rate in interlayer overhead vapor chamber, between quickening and horizontal segment vapor chamber, be communicated with speed.After monitoring and being communicated with completely between each interlayer overhead vapor chamber and 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 can be directly the crude oil on interlayer top be formed and is blocked, therefore, the exploitation method of the auxiliary SAGD of conventional SAGD or solvent all can not effectively be employed such interlayer, and the employing multi-branched well section that the present invention proposes forces to break through sandwich technique, can realize such oil reservoir SAGD well to effectively the employing of middle part reserves, realize the object that increases substantially recovery ratio.
The foregoing is only the schematic specific embodiment of the present invention, not in order to limit scope of the present invention.Any those skilled in the art, not departing from equivalent variations and the modification of having done under the prerequisite of design of the present invention and principle, 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 described oil production method comprises the following steps:
(1) in oil reservoir region, well pattern is set; Described well pattern comprises at least one SAGD Horizontal Well pair; Described SAGD Horizontal Well is to consisting of steam injection well and producing well; The flat section of steam injection well water is positioned at producing well horizontal segment top;
(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 described interlayer middle part;
(3) described steam injection well horizontal segment adopts cutting seam sieve tube completion, is connected described each multi-lateral well section employing liner completion between described steam injection well horizontal segment and each multi-lateral well section by expansible link; At described interlayer, with upper/lower positions, on described tail pipe wall, do not punch, in described interlayer and the above position of interlayer, on described tail pipe wall, evenly tail pipe end, aperture 3～6mm, 3～5/meter of hole density are arrived in linear punching; Described tail pipe end is opening and stretches into multi-lateral well section end;
(4) described steam injection well screen casing inside is lowered to the first long oil pipe that reaches steam injection well tiptoe, and on described the first long oil tube wall, corresponding described screen casing is evenly provided with a plurality of open-works;
(5) in described steam injection well screen casing, be lowered to the solvent parallel with the first long oil pipe and inject supervisor, 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) in described producing well, be lowered to the second long oil pipe to horizontal segment end;
(7) at SAGD well, straight well monitor well is disposed in the horizontal segment left and right sides and the correspondence position that is positioned at each multi-lateral well section sandwich penetrating;
(8), at the production initial stage, steam injection well and producing well all adopt the mode of the steam injection of long oil pipe, ring drainage to carry out cyclic preheat;
(9), from the production initial stage, each multi-lateral well section adopts from solvent injection supervisor handles up to tail pipe heat injection solvent and steam system in each multi-lateral well section;
(10) after steam injection well and producing well cyclic preheat finish, steam injection well is from the first long oil pipe and the continuous steam injection of annular space, and producing well continuous draining is produced;
(11) from straight well monitor well continuous monitoring vapor chamber lifting height, when the vapor chamber of growing from horizontal segment rises gradually, and handle up solvent-vapor chamber of forming while being communicated with each multi-lateral well section of interlayer top, stop handling up, change into from solvent and inject supervisor continuously to each multi-lateral well section injection hot solvent and steam system;
(12) when straight well monitor well monitors the corresponding interlayers of all multi-lateral well sections top and all grows vapor chamber, each multi-lateral well section changes into injects pure steam; Steam injection well the first long oil pipe and annular space continue to inject continuously pure steam.
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, along horizontal segment direction width, be greater than 8 meters, permeability is less than 50 millidarcies, and interlayer top is greater than 2 meters apart from circle, oil reservoir top; Described multi-lateral well section end-to-end distance is from 1～2 meter, circle, oil reservoir top; In the steam injection well of each SAGD Horizontal Well centering, multi-lateral well hop count amount is controlled 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: in described step (2) before, according to SAGD Horizontal Well to the core data of getting in drilling process, with boring well logging, well log interpretation data, identify this SAGD Horizontal Well 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 is apart from 5～10 meters of horizontal segments.
5. 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 (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, and it is characterized in that: in described step (9), the solvent that described notes solvent is handled up and the ratio of steam mixed water injection are 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.
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), the ratio of the hot solvent of described continuous injection and 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 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), the speed that described each multi-lateral well section changes the pure steam of injection into is 100～150 tons/day.
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 to consisting of steam injection well and producing well; The flat section of steam injection well water is positioned at producing well horizontal segment top; 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 oil reservoir intraformational bed middle part; Between described steam injection well horizontal segment and each multi-lateral well section, by expansible link, be connected, described each multi-lateral well section adopts liner completion; At described interlayer, with upper/lower positions, on described tail pipe wall, do not punch, in described interlayer and the above position of interlayer, on described tail pipe wall, evenly tail pipe end, aperture 3～6mm, 3～5/meter of hole density are arrived in linear punching; Described tail pipe end is opening and stretches into multi-lateral well section end; Described steam injection well screen casing inside is lowered to the first long oil pipe that reaches steam injection well tiptoe, and on described the first long oil tube wall, corresponding described screen casing is evenly provided with a plurality of open-works; In described steam injection well screen casing, be lowered to the solvent parallel with the first long oil pipe and inject supervisor, described solvent injects supervisor's endcapped, and described solvent injects between the tail pipe in supervisor and described each multi-lateral well section and is tightly connected by extension hanger; In described producing well, be lowered to the second long oil pipe to horizontal segment end; At SAGD well, straight well monitor well is disposed in the horizontal segment left and right sides and the correspondence position that is positioned at each multi-lateral well section sandwich penetrating.
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, along horizontal segment direction width, be greater than 8 meters, permeability is less than 50 millidarcies, and interlayer top is greater than 2 meters apart from circle, oil reservoir top; Described multi-lateral well section end-to-end distance is from 1～2 meter, circle, oil reservoir top; In the steam injection well of each SAGD Horizontal Well centering, multi-lateral well hop count amount is controlled 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 the 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 is apart from 5～10 meters of horizontal segments.
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