CN102900402B - Development method of offshore small-scale gas reservoir - Google Patents
Development method of offshore small-scale gas reservoir Download PDFInfo
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- CN102900402B CN102900402B CN201210429503.1A CN201210429503A CN102900402B CN 102900402 B CN102900402 B CN 102900402B CN 201210429503 A CN201210429503 A CN 201210429503A CN 102900402 B CN102900402 B CN 102900402B
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Abstract
The invention discloses a development method of an offshore small-scale gas reservoir. The method is characterized by comprising the following steps of: (A) selecting a developed gas field production gas reservoir, and selecting a small-scale gas reservoir to be developed, which is suitable to be developed by adopting the method, in the gas field or around the gas field; (B) selecting a proper offshore position for a drilling ship for taking the place, and establishing an artificial natural gas migration channel between a gas reservoir sand body of the developed gas field production gas reservoir and a small-scale gas reservoir through well drilling and well completion so as to develop the small-scale gas reservoir; and (C) developing the gas reservoir by utilizing a production platform of the developed gas field production gas reservoir or an underwater production system, wherein natural gas in the small-scale gas reservoir enters the gas reservoir sand body of the developed gas field production gas reservoir through the artificial natural gas migration channel under the action of pressure difference, flows to a production well of the production platform or the underwater production system by taking the gas reservoir sand body as a conduction layer and finally flows out of the production well of the production platform or the underwater production system so as to realize the development to the small-scale gas reservoir. According to the development method, through establishing the artificial natural gas migration channel, the traditional development platform or the underwater production system is sufficiently utilized so as to shorten the development period and reduce the investment cost.
Description
Technical field
The present invention relates to a kind of method of the construction of natural gas fields, specifically a kind of marine development approach of gas reservoir on a small scale.
Background technology
Gas reservoir refers to the gas reservoir of gas pool reserve small scale on a small scale, and its recoverable reserves is 2.5 hundred million sides～2,500,000,000 side only.Existing offshore gas field and on a small scale gas reservoir development method are utilizes conventional offshore production platform or subsea production system to bore producing well exploitation.Generally, for small-scale gas reservoir, due to can gas production few, to bore completion investment relatively high, if increase further increase investment of underwater well head at existing production platform external hanging drilling slot or at existing subsea production system, and newly-built production platform or subsea production system construction investment are higher, thereby cause its exploiting economy of poor benefits or be difficult to economic development.
As shown in Figure 1, identical with marine medium gas fields 4 for the development approach of sea small-scale gas reservoir 1 at present, all adopt conventional offshore production platform 8 or subsea production system exploitation.Be mainly that at sea production platform 8 or subsea production system bore producing well 7, directly open gas reservoir 1, the natural gas in gas reservoir 1 flows to producing well 7 from gas reservoir 1 under the effect of expansion energy, and the flow string by each producing well is by directly extraction.There is following shortcoming in above-mentioned development approach: 1, newly-built production platform or subsea production system drilling well exploitation, from new production platform or subsea production system, be built into and put into production, cycle is long, investment is large, be difficult to realize and developed in gas field or its economical and effective of gas reservoir exploitation on a small scale around to sea, also will cause existing well pattern and the existing production facility of developing gas field production platform or subsea production system to utilize simultaneously; 2, develop gas field production platform without residue well slot or subsea production system without residue underwater well head, also cannot adding and hanging well slots or increase underwater well head, or directly from built production platform or subsea production system drilling well, develop the situation that cannot realize because of reasons such as economy, technology, the reserves of gas reservoir cannot be employed on a small scale, and the valuable natural gas resource of country will be wasted.
Summary of the invention
In order to overcome above-mentioned deficiency, it is a kind of by existing development platform or subsea production system are made full use of that the object of the invention is to provide, thus the marine development approach of gas reservoir on a small scale of shortening construction cycle, reduction cost of investment.
To achieve these goals, the technical solution used in the present invention is as follows:
A marine development approach for gas reservoir on a small scale, comprises the following steps:
A, the selected gas field of having developed produce gas reservoir, and in the surrounding that develops gas field production gas reservoir, select to need the small-scale gas reservoir to be developed of exploitation.
B, drill ship select suitable offshore location in place, and by drilling well and completion, set up artificial natural gas migration pathway with exploitation small-scale gas reservoir developing between sandstone reservoir that gas field produces gas reservoir and small-scale gas reservoir to be developed;
Production platform or subsea production system that gas field production gas reservoir has been developed in C, utilization carry out gas reservoir development: the natural gas in gas reservoir is entered and developed the sandstone reservoir that gas field produces gas reservoir by artificial natural gas migration pathway under the effect of pressure reduction on a small scale, the sandstone reservoir of take flows to the producing well of production platform or subsea production system as carrier bed, last natural gas flows out from the producing pattern of described production platform or subsea production system, thereby realizes the exploitation to described small-scale gas reservoir.
Beneficial effect of the present invention: owing to adopting above-mentioned development approach, the present invention have following some:
1) pass through suitable ground location drill ship in place and drilling well, completion at sea, developing gas field production Gas Reservoir sand body and between gas reservoir, setting up artificial natural gas migration pathway on a small scale, can realize and develop in gas field or its economical and effective of gas reservoir exploitation on a small scale around to sea;
2) need not, from production platform or subsea production system drilling well, can reduce drill ship task difficulty in place and risk;
3) make full use of and develop gas field production platform and produce the existing well pattern that gas reservoir or subsea production system are produced gas reservoir, need not completion in above-mentioned the set up above well section of artificial natural gas migration pathway bridging plug, can reduce completion period, reduce Completion cost;
4) make full use of the existing production facility of developing gas field production platform or subsea production system, can save development investment;
5) adopt the method to rely on sea to develop gas field production platform or the marine gas reservoir on a small scale of subsea production system exploitation, neither need to remain well slot or residue underwater well head and adding and hanging well slots or increase underwater well head, more do not need newly-built production platform or subsea production system, greatly reduce development investment, greatly improved economic benefit.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Fig. 1 is the structural representation of the development approach of existing small-scale gas reservoir;
Fig. 2 is the structural representation that the present invention develops.
In figure: 1, selected small-scale gas reservoir to be developed; 2, artificial natural gas migration pathway; 3, bridging plug; 4, develop gas field and produced gas reservoir; 5, construction well; 6, Multilateral Wells; 7, producing well; 8, production platform; 9, drill ship; 10, sea; 11, bore hole.
The specific embodiment
As shown in Figure 2, a kind of marine development approach of gas reservoir on a small scale, specifically comprises the following steps:
1) at sea developed in gas field development early stage, from selecting in gas field sandstone reservoir physical property to belong to middle and high infiltration, be permeability ﹥ 10mD and the more stable production gas reservoir 4 that distributes, in conjunction with this, produce the sandstone reservoir spatial distribution scope of gas reservoir 4 and the drilling duty of drill ship, at the small-scale gas reservoir 1 to be developed of developing the applicable development approach of the present invention of selection in gas field or around it simultaneously;
2), according to above-mentioned selected small-scale gas reservoir 1 to be developed with developed the spatial relationship that gas field produces gas reservoir 4, at sea suitable ground location drill ship 9 in place, forms construction well 5;
3) utilize construction well 5, drill selected small-scale gas reservoir 1 to be developed and developed the sandstone reservoir formation bore hole 11 that gas field produces gas reservoir 4, then according to the reservoir properties feature selecting of selected small-scale gas reservoir to be developed 1 and production gas reservoir 4, determine the sand control completion mode of two gas reservoir well sections, and by selected completion mode, two gas reservoir well sections are carried out to sand control completion; Working solution in two gas reservoir well sections after sand control completion can be discharged if desired; On last two gas reservoir well sections after sand control completion or before beat bridging plug 3 and carry out packing, at small-scale gas reservoir 1 to be developed, set up artificial natural gas migration pathway 2 to develop small-scale gas reservoir 1 with having developed gas field and produce between the sandstone reservoir of gas reservoir 4;
4) if desired in the non-wiping situation of drill ship, in construction well 5, can set up a plurality of Multilateral Wells 6, utilize a plurality of Multilateral Wells 6 by above-mentioned steps 3) can develop between gas field production gas reservoir 4 and the different parts or other a plurality of selected small-scale gas reservoirs 1 to be developed of same selected small-scale gas reservoir 1 to be developed, set up the artificial natural gas migration pathway 2 of a plurality of exploitation small-scale gas reservoirs with exploitation small-scale gas reservoir 1, and discarded construction well 5 and each Multilateral Wells 6;
5) if desired, it is in place that drill ship can move on to new correct position, by above-mentioned steps, sets up the new exploitation artificial natural gas migration pathway 2 of gas reservoir 1 on a small scale;
6) natural gas in small-scale gas reservoir 1, by artificial natural gas migration pathway 2 under the effect of pressure reduction, flows to and has developed sandstone reservoir and the producing well pressure drop felt area thereof that gas field produces gas reservoir 4;
7) in the natural gas of the natural gas of the small-scale gas reservoir 1 flowing into and the sandstone reservoir in this productions gas reservoir 4 and producing well pressure drop felt area thereof, together with original relatively low pressure natural gas, flow to the producing well 7 that has production platform 8 or subsea production system;
8) natural gas flows out from existing producing well 7, by production platform 8 or subsea production system on sea 10, is gathered, thereby realize, to sea, has developed in gas field or its economical and effective of gas reservoir 1 exploitation on a small scale around.
The above is the preferred embodiment of the present invention, certainly can not limit with this interest field of the present invention.It should be pointed out that for those skilled in the art, technical scheme of the present invention is modified or is equal to replacement, do not depart from protection scope of the present invention.
Claims (1)
1. a marine development approach for gas reservoir on a small scale, is characterized in that, comprises the following steps: A, the selected gas field of having developed produce gas reservoir, and in the surrounding that develops gas field production gas reservoir, selects to need the small-scale gas reservoir to be developed of exploitation; B, drill ship select suitable offshore location in place, and by drilling well and completion, are developing the sandstone reservoir of gas field production gas reservoir and between gas reservoir, setting up on a small scale artificial natural gas migration pathway with exploitation small-scale gas reservoir; Production platform or subsea production system that gas field production gas reservoir has been developed in C, utilization carry out gas reservoir development: the natural gas in gas reservoir is entered and developed the sandstone reservoir that gas field produces gas reservoir by artificial natural gas migration pathway under the effect of pressure reduction on a small scale, the sandstone reservoir of take flows to the producing well of production platform or subsea production system as carrier bed, last natural gas flows out from the producing pattern of described production platform or subsea production system, thereby realizes the exploitation to described small-scale gas reservoir;
Described small-scale gas reservoir refers to the gas reservoir of gas pool reserve small scale, and its recoverable reserves is 2.5 hundred million sides～2,500,000,000 side only;
In described steps A, developed the system of selection that gas field produces gas reservoir and be: having developed in gas field development in early days at sea, has been permeability ﹥ 10mD and the more stable production gas reservoir that distributes from selecting sandstone reservoir physical property to belong to middle and high infiltration in gas field;
In described step B, the system of selection of drill ship suitable offshore location in place is: in conjunction with production platform or subsea production system, produce the sandstone reservoir spatial distribution scope of gas reservoir, the particular location of the drilling duty of drill ship and on a small scale gas reservoir is comprehensively determined.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210429503.1A CN102900402B (en) | 2012-11-01 | 2012-11-01 | Development method of offshore small-scale gas reservoir |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210429503.1A CN102900402B (en) | 2012-11-01 | 2012-11-01 | Development method of offshore small-scale gas reservoir |
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| CN102900402A CN102900402A (en) | 2013-01-30 |
| CN102900402B true CN102900402B (en) | 2014-05-07 |
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| CN201210429503.1A Expired - Fee Related CN102900402B (en) | 2012-11-01 | 2012-11-01 | Development method of offshore small-scale gas reservoir |
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| CN110469318B (en) * | 2019-08-13 | 2023-01-24 | 中海石油(中国)有限公司 | Method for determining minimum recoverable reserve scale of economic development of ultra-deep water oil field in exploration period |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0435727A1 (en) * | 1989-12-29 | 1991-07-03 | Institut Français du Pétrole | Method and device for stimulation of an underground formation by injection of a fluid coming from an adjacent zone being connected to the first one by a drain hole transversing a low-permeable intermediate layer |
| CN1056211A (en) * | 1991-05-31 | 1991-11-13 | 吴宁 | A kind of multi-functional TV system |
| WO2005003509A1 (en) * | 2003-06-30 | 2005-01-13 | Petroleo Brasileiro S A-Petrobras | Method for, and the construction of, a long-distance well for the production, transport, storage and exploitation of mineral layers and fluids |
| RU2374435C2 (en) * | 2007-08-23 | 2009-11-27 | Общество с ограниченной ответственностью "Тюменский нефтяной научный центр" | Method of multi-layered oil field development with presents of highly permeable interlayer using hydraulic fracturing |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0671549A1 (en) * | 1994-03-10 | 1995-09-13 | Shell Internationale Researchmaatschappij B.V. | Method of producing a fluid from an earth formation |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0435727A1 (en) * | 1989-12-29 | 1991-07-03 | Institut Français du Pétrole | Method and device for stimulation of an underground formation by injection of a fluid coming from an adjacent zone being connected to the first one by a drain hole transversing a low-permeable intermediate layer |
| CN1056211A (en) * | 1991-05-31 | 1991-11-13 | 吴宁 | A kind of multi-functional TV system |
| WO2005003509A1 (en) * | 2003-06-30 | 2005-01-13 | Petroleo Brasileiro S A-Petrobras | Method for, and the construction of, a long-distance well for the production, transport, storage and exploitation of mineral layers and fluids |
| RU2374435C2 (en) * | 2007-08-23 | 2009-11-27 | Общество с ограниченной ответственностью "Тюменский нефтяной научный центр" | Method of multi-layered oil field development with presents of highly permeable interlayer using hydraulic fracturing |
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