CN205297523U - Well type is adopted to notes to old oil field development - Google Patents
Well type is adopted to notes to old oil field development Download PDFInfo
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- CN205297523U CN205297523U CN201521113701.2U CN201521113701U CN205297523U CN 205297523 U CN205297523 U CN 205297523U CN 201521113701 U CN201521113701 U CN 201521113701U CN 205297523 U CN205297523 U CN 205297523U
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Abstract
The utility model discloses a well type is adopted to notes to old oil field development, it includes: a straight well for injecting transfer and drive the solvent, a plurality of horizontal wells, its horizontal segment encircle and set up for recover the oil around the straight well, the length of horizontal section of horizontal well is at 150m to between the 200m scope. This well type adopts the corresponding relation through the horizontal well and the suitable notes of configuration formation of straight well, so, this well type has and rushes down the advantage that the oil level is long -pending big, the producing pressure drop is little, the water -absorbing capacity that can effectively improve the well with prevent that the oil well from shaking out, can also increase water drive spread area simultaneously, improve oil reservoir development effect. These notes are adopted well type and had both been overcome the inefficient defect of " straight well - straight well " combination, have also overcome the expensive drawback of " horizontal well - horizontal well " combination, have played economy, applicable, efficient effect, can further improve the profit margin of enterprise.
Description
Technical field
This utility model relates to field of petroleum exploitation, particularly to a kind of injection-production well type for old filed exploitation.
Background technology
At present, the petroleum-in-place of oil field at home 70% is already at the middle and late stage of exploitation, and it has stepped into the ranks of old filed. The oil field that so-called old filed generally refers to development time length, recovery percent of reserves is high, comprehensive water cut is high, remaining geologic reserves exploitation difficulty is big. While it is true, old filed is still the core force of crude oil output, still there is the existence of remaining oil the local of oil reservoir. Therefore, the theme being still that current oil industry developed again by old filed secondary development, old filed, it is necessary to higher development technique, more economic input.
In reservoir engineering design, straight well well type is the conventional art in oil field development, and its design, construction are all relatively simple. In oil reservoir development process, straight well well type is popularized, and straight well well type is main force's well type of oil reservoir development, is made that tremendous contribution for world's crude oil production. But, technical staff finds on stream, and straight well is little with oil reservoir contact area, controls weak effect, is often straight line, involves and be limited in scope between well and well, wants to control larger area, it is necessary to dispose more well. Horizontal well technology is to obtain everybody a universally recognized new technique eighties, it it is the effective means of Efficient Development oil gas field, use one of main purpose of horizontal well technology be it with oil reservoir contact area is big, control reserve is big, yield is high, reach to improve recovery ratio by improving oil reservoir development degree. But, stratum is needed precisely understanding by horizontal well, also needs to high-precision instrument and coordinate in work progress, and therefore input cost is high.
Utility model content
In order to overcome the drawbacks described above of prior art, this utility model embodiment technical problem to be solved there is provided a kind of injection-production well type for old filed exploitation, and it can save cost while improving the oil displacement efficiency to old filed oil reservoir.
The concrete technical scheme of this utility model embodiment is:
A kind of injection-production well type for old filed exploitation, it includes: for injecting the straight well of transfer drive solvent;For the multiple horizontal wells recovered the oil, its horizontal segment is circumferentially positioned at around described straight well, and the horizontal section length of described horizontal well is between 150m to 200m scope.
Being preferably carried out in mode at one, the distance of the end points of described straight well and described horizontal well horizontal segment is 200m.
Being preferably carried out in mode at one, the quantity of described horizontal well is two, and its horizontal segment is distributed in the both sides of described straight well respectively.
Being preferably carried out in mode at one, described straight well is positioned on the perpendicular bisector of two horizontal well horizontal segments.
Being preferably carried out in mode at one, the horizontal segment of two described horizontal wells is specular.
Being preferably carried out in mode at one, the horizontal segment annular spread of two described horizontal wells is around described straight well.
Being preferably carried out in mode at one, the horizontal segment of described horizontal well is positioned under earth's surface the same degree of depth.
Being preferably carried out in mode at one, the horizontal section length of described horizontal well is between 180m to 200m scope.
Being preferably carried out in mode at one, the horizontal section length of described horizontal well is 180m.
Being preferably carried out in mode at one, the horizontal section length of described horizontal well is 200m.
The technical solution of the utility model has following notable beneficial effect:
This utility model proposes a kind of injection-production well type for old filed exploitation, this well type forms suitable injection-production relation by the configuration of horizontal well with straight well, so, this well type has rushes down the advantage that pasta is long-pending greatly, producing pressure differential is little, the water absorbing capacity of well can be effectively improved and prevent sand production, water drive sweep area can also be increased simultaneously, improve effect of reservoir development. This injection-production well type both overcame the defect that " straight well-straight well " combination is inefficient, also overcomes " horizontal well-horizontal well " and combines the drawback of high cost, serves economy, is suitable for, acts on efficiently, it is possible to improves the profit margin of enterprise further.
Accompanying drawing explanation
Accompanying drawing described here only for illustrative purposes, and is not intended to limit this utility model scope of disclosure by any way. It addition, the shape of each parts in figure and proportional sizes etc. are only schematic, it is adapted to assist in understanding of the present utility model, is not the shape and the proportional sizes that specifically limit each parts of this utility model. Those skilled in the art is under instruction of the present utility model, it is possible to select various possible shape and proportional sizes to implement this utility model as the case may be.
Fig. 1 is the schematic diagram of straight well injection-production well type.
Fig. 2 is the schematic diagram of the injection-production well type in this utility model for old filed exploitation.
The accompanying drawing labelling of the figures above: 1, straight well; 2, horizontal well.
Detailed description of the invention
Description in conjunction with accompanying drawing and this utility model detailed description of the invention, it is possible to clearly understand details of the present utility model. But, detailed description of the invention of the present utility model described here, only it is used for explaining the purpose of this utility model, and can not be understood as by any way is to restriction of the present utility model. Under instruction of the present utility model, technical staff is it is contemplated that based on arbitrarily possible deformation of the present utility model, these are regarded as belonging to scope of the present utility model.
Since 2015, international oil price is constantly descending, broken by a fall from more than 100 dollar the year before 40 dollars of every barrel of price. International expert is predicted, the low oil price epoch will exist in longer one period. In this case oil field development is proposed more severe challenge. If not restarting old filed research and development, production scale is difficult to continue; If restarted, it is necessary to introduce new technique and can be only achieved effect, for instance horizontal well technology, but all according to horizontal well design, fund input can be increased further, cause enterprise profit space reduction.
Present applicant has proposed a kind of injection-production well type for old filed exploitation, Fig. 2 is the schematic diagram of the injection-production well type in this utility model for old filed exploitation, as in figure 2 it is shown, comprising: be used for injecting the straight well 1 of transfer drive solvent;For the multiple horizontal wells 2 recovered the oil, its horizontal segment is circumferentially positioned at around straight well 1, and the horizontal section length of horizontal well 2 is between 150m to 200m scope.
This well type passes through the injection-production relation that horizontal well 2 is suitable with the configuration formation of straight well 1, and so, this well type has rushes down the advantage that pasta is long-pending greatly, producing pressure differential is little, can be effectively increased water drive sweep area, improve effect of reservoir development. This injection-production well type both overcame the defect that " straight well-straight well " combination is inefficient, also overcomes " horizontal well-horizontal well " and combines the drawback of high cost, serves economy, is suitable for, acts on efficiently, it is possible to improves the profit margin of enterprise further.
The injection-production well type developed for old filed for this this utility model below is described further, the application provide for old filed exploitation injection-production well type it include the straight well 1 for injecting transfer drive solvent, around straight well 1, be surrounded with multiple horizontal well 2 for recovering the oil. Transfer drive solvent can include the reagent mixed by thickening agent, oil displacement agent, friction reducer or water shutoff agent etc. The feature of this kind of injection-production well type is for be combined by straight well 1 and horizontal well 2. In the present embodiment, straight well 1 is 200m with the distance of the end points of horizontal well 2 horizontal segment. The horizontal segment of horizontal well 2 is positioned under earth's surface the same degree of depth. When the horizontal segment of horizontal well 2 is in the same degree of depth under earth's surface, after injecting transfer drive solvent from straight well 1, form the spread area of the more efficiently displacement of reservoir oil between straight well 1 and horizontal well 2 so that two horizontal wells 2 being in the same degree of depth have effect of better recovering the oil.
The quantity of horizontal well 2 is two, and its horizontal segment is distributed in the both sides of straight well 1 respectively. Specifically, straight well 1 may be located on the perpendicular bisector of two horizontal well 2 horizontal segments, and two horizontal wells 2 can also be specular, or all right annular spread of horizontal segment of two horizontal wells 2 is in straight well 1 around.
Fig. 1 is the schematic diagram of straight well injection-production well type, as shown in Figure 1, if the feature for oil reservoir, if according to oil reservoir routine engineering design method, adopting pattern for 200 meters of well spacings, square well pattern, " five-spot " note, well type all adopts straight well 1, middle diameter is used for injecting transfer drive solvent, four straight wells 1 around are used for recovering the oil, and simulate with a well group conceputal modeling well type, the effect that displacement pattern will be formed as shown in Figure 1. Being shown by analog result, water drive sweep area is 52.4%, peak period individual well increase day by day oil amplitude be about 61.2%, about 7 months effect duration.
If the injection-production well type for the old filed exploitation well type of oil well changed in Fig. 2, the direction of horizontal well 2 is parallel, injecting well is straight well 1, straight well 1 and horizontal well 2 two-end-point distance are 200 meters, the segment length of horizontal well 2 horizontal segment is 200 meters simultaneously, other oil deposit parameter are identical with straight well 1 scheme, conceputal modeling. Being shown by analog result, water drive sweep area ratio is 75.8%, peak period individual well increase day by day oil amplitude be about 95%, about 12 months effect duration.
Above-mentioned is the contrast of a well group conceputal modeling, after the straight well 1 being circumferentially positioned at surrounding is changed to two horizontal wells 2, it appeared that it is little for the producing pressure differential in the injection-production well type of old filed exploitation in this utility model, rush down pasta long-pending big, and its water drive spread area volume factor significantly improves after adopting horizontal well 2, 75.8% is brought up to by original 52.4%, crude output substantially increases, although horizontal well 2 input cost is high, but 4 mouthfuls of straight wells 1 originally are transformed to 2 mouthfuls of water horizontal wells 2, the quantity of well decreases 50%, drilling cost increasing degree is only small, so that ratio for input and output is improved, enterprise profit increases.
It is below embodiment of the present utility model:
Certain oil reservoir belongs to middle and high infiltration sandstone oil reservoir, and permeability is 610 millidarcies, reservoir thickness 13.6 meters.
Again, in exploitation old filed process, devise kinds of schemes by " five-spot " the injection-production well type shown in Fig. 1 respectively in the abundant region of local remaining oil and carry out secondary development pilot test. First, choose an appropriate area first, according to the well type configuration that straight well note-straight well is adopted, 4 mouthfuls of straight wells 1 recovered the oil distributed about at the straight well 1 of 1 mouthful of injection transfer drive solvent, 4 mouthfuls of straight well 1 uniform ring respectively recovered the oil be wound on inject transfer drive solvent straight well 1 around, injecting the straight well 1 of transfer drive solvent with the spacing of the straight well 1 recovered the oil is 200 meters, and well pattern form is square, inject transfer drive solvent straight well 1 and recover the oil straight well 1 between be wired to 90 degree of angles, specifically as shown in Figure 1. From injecting appearance effect after transfer drive solvent starts 95 days middle straight well 1, the oil amplitude that increases day by day is 41%, and effect duration is 6.5 months.
Choosing another region second, configure for the injection-production well type of old filed exploitation according in this utility model, specifically as shown in Figure 2,2 mouthfuls of horizontal wells 2 for recovering the oil are arranged 1 mouthful of straight well 1 both sides injecting transfer drive solvent, wherein, the distance of straight well 1 and horizontal well 2 end points is 200 meters, the horizontal section length of the horizontal well 2 of different well groups is separately designed and is 150 meters, 180 meters, 200 meters and verifies Flooding Efficiency:
A well group, the horizontal segment length of horizontal well 2 is 150 meters, injects latter 64 days and starts to take effect, and the oil amplitude that on average increases day by day is 55%, and effect duration is 10.4 months.
B well group, the horizontal segment length of horizontal well 2 is 180 meters, injects latter 59 days and starts to take effect, and the oil amplitude that on average increases day by day is 77%, and effect duration is 12.8 months.
C well group, the horizontal segment length of horizontal well 2 is 200 meters, injects latter 55 days and starts to take effect, and the oil amplitude that on average increases day by day is 95%, and effect duration is 12.1 months.
By in above-described embodiment it can be seen that adopt the well type that straight well injects, the well type of horizontal well production is injected than straight well, straight well recovers the oil to have better oil displacement efficiency, the oil amplitude that on average increases day by day rises, and lasting effective time is longer. Secondly, finding in the actual oil recovery effect of the well type organizing straight wells injection, horizontal well production, the length of horizontal well horizontal segment is more long, and the displacement of reservoir oil area of this well type is more big, and oil increasing effect is better more. Simultaneously, it was found that the growth increasing the effect duration on well type oil of horizontal well horizontal section length affects little, and, after the oil amplitude that increases day by day is substantially increased, the effect duration of its amplification is reduction trend.
Each embodiment in this specification all adopts the mode gone forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar part mutually referring to.
Above-described embodiment only for technology of the present utility model design and feature are described, its object is to allow person skilled in the art will appreciate that content of the present utility model and to implement according to this, can not limit protection domain of the present utility model with this. All equivalences made according to this utility model spirit change or modify, and all should be encompassed within protection domain of the present utility model.
Claims (10)
1. the injection-production well type for old filed exploitation, it is characterised in that it includes: for injecting the straight well of transfer drive solvent; For the multiple horizontal wells recovered the oil, its horizontal segment is circumferentially positioned at around described straight well, and the horizontal section length of described horizontal well is between 150m to 200m scope.
2. the injection-production well type for old filed exploitation according to claim 1, it is characterised in that the distance of the end points of described straight well and described horizontal well horizontal segment is 200m.
3. the injection-production well type for old filed exploitation according to claim 1, it is characterised in that the quantity of described horizontal well is two, and its horizontal segment is distributed in the both sides of described straight well respectively.
4. the injection-production well type for old filed exploitation according to claim 3, it is characterised in that described straight well is positioned on the perpendicular bisector of two horizontal well horizontal segments.
5. the injection-production well type for old filed exploitation according to claim 3, it is characterised in that the horizontal segment of two described horizontal wells is specular.
6. the injection-production well type for old filed exploitation according to claim 3, it is characterised in that the horizontal segment annular spread of two described horizontal wells is around described straight well.
7. the injection-production well type for old filed exploitation according to claim 1, it is characterised in that the horizontal segment of described horizontal well is positioned under earth's surface the same degree of depth.
8. the injection-production well type for old filed exploitation according to claim 1, it is characterised in that the horizontal section length of described horizontal well is between 180m to 200m scope.
9. the injection-production well type for old filed exploitation according to claim 8, it is characterised in that the horizontal section length of described horizontal well is 180m.
10. the injection-production well type for old filed exploitation according to claim 8, it is characterised in that the horizontal section length of described horizontal well is 200m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521113701.2U CN205297523U (en) | 2015-12-29 | 2015-12-29 | Well type is adopted to notes to old oil field development |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201521113701.2U CN205297523U (en) | 2015-12-29 | 2015-12-29 | Well type is adopted to notes to old oil field development |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107239898A (en) * | 2017-05-31 | 2017-10-10 | 河北宏龙环保科技有限公司 | A kind of deep southern regional evaluating production capacity method of Ulmaceae |
| CN108805317A (en) * | 2017-04-28 | 2018-11-13 | 中国石油化工股份有限公司 | A kind of method of the horizontal segment optimization length of determining horizontal well |
| CN110173252A (en) * | 2019-04-28 | 2019-08-27 | 中国石油天然气股份有限公司 | A kind of encryption method and its evaluation method of horizontal well development gas reservoir well pattern |
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2015
- 2015-12-29 CN CN201521113701.2U patent/CN205297523U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108805317A (en) * | 2017-04-28 | 2018-11-13 | 中国石油化工股份有限公司 | A kind of method of the horizontal segment optimization length of determining horizontal well |
| CN108805317B (en) * | 2017-04-28 | 2021-04-27 | 中国石油化工股份有限公司 | Method for determining optimal length of horizontal section of horizontal well |
| CN107239898A (en) * | 2017-05-31 | 2017-10-10 | 河北宏龙环保科技有限公司 | A kind of deep southern regional evaluating production capacity method of Ulmaceae |
| CN110173252A (en) * | 2019-04-28 | 2019-08-27 | 中国石油天然气股份有限公司 | A kind of encryption method and its evaluation method of horizontal well development gas reservoir well pattern |
| CN110173252B (en) * | 2019-04-28 | 2021-08-31 | 中国石油天然气股份有限公司 | Encryption method and evaluation method for horizontal well development gas reservoir well pattern |
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