CN105003235A - Method for improving condensate oil recovery ratio through injecting water into fracture-cave type carbonate condensate gas reservoir - Google Patents
Method for improving condensate oil recovery ratio through injecting water into fracture-cave type carbonate condensate gas reservoir Download PDFInfo
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Abstract
The invention provides a method for improving the condensate oil recovery ratio through injecting water into a fracture-cave type carbonate condensate gas reservoir. The method comprises the following steps of: (1) reservoir type identification; (2) retrograde condensation and oil ring judgment; (3) study on the underground occurrence state of retrograde condensation oil; (4) indoor physical experiment analysis and study; (5) trial injection; (6) water injection; (7) well soaking; and (8) oil production. The method has the advantages that the technical storage and the favorable support are provided for the recovery ratio improvement through water injection development of the fracture-cave type carbonate condensate gas reservoir, and the recovery ratio is greatly improved.
Description
Technical field
The present invention relates to a kind of oil and gas development method, especially relate to a kind of for fracture-cavity type carbonate gas condensate reservoir condensate recovery method.
Background technology
Gas condensate reservoir mining site Development Practice shows, the low condensate gas condensate reservoir that contains can carry out the exploitation of exhaustion formula, and gas recycling technology is then the agent technology containing condensate gas condensate reservoir high in exploitation.But for the fracture-cavity type carbonate gas condensate reservoir of middle height containing condensate, because its reservoir space is mainly the hole of corrosion formation, hole, seam, non-homogeneity is extremely strong, Reservoir Body connectivity structure and mode of communicating complexity various, early stage well spacing is large, connected relation is difficult to determine, gas recycling is caused to be difficult to carry out, therefore, many employing exhaustion formulas exploitation at present, mid-later development phase strata pressure declines, retrograde condensation is there is in stratum, certainly exist a large amount of condensates, how to meet the condensate recovery ratio improving such gas reservoir under economic benefit prerequisite further, it is the main bugbear that seam hole type gas condensate reservoir exhaustion formula development late stage faces, still lack effective exploitation method at present.Therefore, propose a kind of fracture-cavity type carbonate gas condensate reservoir water filling and improve condensate recovery ratio method, actual guidance is carried out to such gas reservoir Efficient Development, just seems particularly important.
Summary of the invention
The object of the invention is to avoid the deficiencies in the prior art and provide a kind of fracture-cavity type carbonate gas condensate reservoir water filling to improve condensate recovery ratio method.
For reaching above object, technical scheme of the present invention is:
The water filling of a kind of fracture-cavity type carbonate gas condensate reservoir improves condensate recovery ratio method, containing following steps:
1) identification of Storage category: seismic profile shows as " strong beading ", during drilling well, emptying, leakage occur, and during pilot production, oil pressure presents exponential decrease, show as relative constant volume feature, successively decrease large, well test analysis well storage coefficient is large, kh value is large, can be judged to be fractured-vuggy reservoir;
2) retrograde condensation and oil ring judge: according to PVT test, and a situation arises for production gas-oil ratio, output condensate variable density judgement retrograde condensation; Calculate relevant parameter by well stream thing data and determine whether to there is oil ring in conjunction with oil density variation tendency;
3) retrograde gas condensate is studied at underground occurrence status: fracture-cavity type carbonate reservoir space is based on cave, corrosion hole, crack, capillary force effect is weak, in retrograde condensation process, the main gravitate of condensate is dominated, exist with the occurrence patterns be gathered in bottom the body of seam hole, before CONDENSATE OIL AND GAS interface reaches shaft bottom, condensate participates in flowing hardly;
4) indoor Physical Experiment analysis and research: level is communicated with fracture-cavity units, water injection to keep pressure exploitation condensate recovery ratio is high, is better than gas injection pressurize, should preferably considers; Vertical connection fracture cave reservoir, water filling is effective for gas, improves condensate recovery ratio;
5) injection test: after seam hole type gas condensate reservoir exhaustion formula end-of-development, before normal water filling, carry out injection test and select the well location that condensate is adopted in applicable water filling in some cycles, then in conjunction with Reservoir Body type and condensate in place determination water injection intensity and water injection rate;
6) water filling: inject in this gas condensate reservoir appropriate density ratio crude oil large and with the immiscible simply and easy treat of crude oil after stratum sewage, with renwing stratum energy, displacement condensate;
7) stewing well: utilize the difference injecting stratum sewage and oil density, allow profit fully replace by gravitational differentiation, makes low-density condensate converge to reservoir high-order bit thus be plucked out of;
8) recover the oil: when well head oil pressure return to basicly stable after drive a well and adopt condensate.
It is better that condensate effect is adopted in the first run time water filling, can carry out multiple round water filling and adopt condensate operation, until without economic benefit.
Compared with prior art, the invention has the beneficial effects as follows: provide technological reserve and beneficial support for fracture-cavity type carbonate gas condensate reservoir waterflooding extraction improves recovery ratio, recovery ratio improves a lot.
Accompanying drawing explanation
Fig. 1 is that condensate correlation curve is adopted in fracture-cavity type carbonate gas condensate reservoir huff and puff/water filling of the present invention.
Fig. 2 is that the present invention is not with/gas condensate reservoir with oil rim retrograde condensation phase judgement (envelop).
Fig. 3 is that the present invention is not with/gas condensate reservoir with oil rim retrograde condensation phase judgement (condensate density, viscosity).
Fig. 4 is that the present invention is not with/gas condensate reservoir with oil rim retrograde condensation phase judgement (production gas-oil ratio).
Detailed description of the invention
State in detail below in conjunction with accompanying drawing and chat embodiments of the invention.
The water filling of a kind of fracture-cavity type carbonate gas condensate reservoir improves condensate recovery ratio method, containing following steps:
1) identification of Storage category: seismic profile shows as " strong beading ", during drilling well, emptying, leakage occur, and during pilot production, oil pressure presents exponential decrease, show as relative constant volume feature, successively decrease large, well test analysis well storage coefficient is large, kh value is large, can be judged to be fractured-vuggy reservoir;
2) retrograde condensation and oil ring judge: according to PVT test, and a situation arises for production gas-oil ratio, output condensate variable density judgement retrograde condensation; Calculate relevant parameter by well stream thing data and determine whether to there is oil ring in conjunction with oil density variation tendency; For height containing condensate and with the gas reservoir of oil ring, once there is retrograde condensation during blowdown, the later stage has a high potential, and is the highest priority of carrying out water filling;
3) retrograde gas condensate is studied at underground occurrence status: sandstone reservoir space is mainly hole and throat, after such gas condensate reservoir generation retrograde condensation, the leading role that condensate is often subject to capillary force can be attracted to throat surface, hole, initial stage does not flow, middle and later periods reduces further along with strata pressure, retrograde condensation aggravates, and condensate reaches critically connected graph and participates in seepage flow; And fracture-cavity type carbonate reservoir space is based on cave, corrosion hole, crack, capillary force effect is weak, in retrograde condensation process, the main gravitate of condensate is dominated, exist with the occurrence patterns be gathered in bottom the body of seam hole, before CONDENSATE OIL AND GAS interface reaches shaft bottom, condensate participates in flowing hardly; , so seam hole type gas condensate reservoir blowdown condensate recovery ratio is lower;
4) indoor Physical Experiment analysis and research: the exploitation of exhaustion formula can cause a large amount of condensate to be lost in underground, and condensate recovery ratio is low; Huff and puff, owing to not forming the Efficient Cycle of injected gas, does not have displacement of reservoir oil effect, improves recovery ratio effect poor; And early stage pressurize exploitation can significantly improve condensate recovery ratio.Be communicated with fracture-cavity units for level, water injection to keep pressure exploitation condensate recovery ratio is high, is better than gas injection pressurize, should preferably considers; Vertical connection fracture cave reservoir, water filling is effective for gas, improves condensate recovery ratio;
5) injection test: after seam hole type gas condensate reservoir exhaustion formula end-of-development, before normal water filling, carry out injection test and select the well location that condensate is adopted in applicable water filling in some cycles, then in conjunction with Reservoir Body type and condensate in place determination water injection intensity and water injection rate;
6) water filling: inject in this gas condensate reservoir appropriate density ratio crude oil large and with the immiscible simply and easy treat of crude oil after stratum sewage, with renwing stratum energy, displacement condensate;
7) stewing well: utilize the difference injecting stratum sewage and oil density, allow profit fully replace by gravitational differentiation, makes low-density condensate converge to reservoir high-order bit thus be plucked out of;
8) recover the oil: when well head oil pressure return to basicly stable after drive a well and adopt condensate.
It is better that condensate effect is adopted in the first run time water filling, can carry out multiple round water filling and adopt condensate operation, until without economic benefit.
Claims (2)
1. the water filling of fracture-cavity type carbonate gas condensate reservoir improves a condensate recovery ratio method, it is characterized in that: containing following steps:
1) identification of Storage category: seismic profile shows as " strong beading ", during drilling well, emptying, leakage occur, and during pilot production, oil pressure presents exponential decrease, show as relative constant volume feature, successively decrease large, well test analysis well storage coefficient is large, kh value is large, can be judged to be fractured-vuggy reservoir;
2) retrograde condensation and oil ring judge: according to PVT test, and a situation arises for production gas-oil ratio, output condensate variable density judgement retrograde condensation; Calculate relevant parameter by well stream thing data and determine whether to there is oil ring in conjunction with oil density variation tendency;
3) retrograde gas condensate is studied at underground occurrence status: fracture-cavity type carbonate reservoir space is based on cave, corrosion hole, crack, capillary force effect is weak, in retrograde condensation process, the main gravitate of condensate is dominated, exist with the occurrence patterns be gathered in bottom the body of seam hole, before CONDENSATE OIL AND GAS interface reaches shaft bottom, condensate participates in flowing hardly;
4) indoor Physical Experiment analysis and research: level is communicated with fracture-cavity units, water injection to keep pressure exploitation condensate recovery ratio is high, is better than gas injection pressurize, should preferably considers; Vertical connection fracture cave reservoir, water filling is effective for gas, improves condensate recovery ratio;
5) injection test: after seam hole type gas condensate reservoir exhaustion formula end-of-development, before normal water filling, carry out injection test and select the well location that condensate is adopted in applicable water filling in some cycles, then in conjunction with Reservoir Body type and condensate in place determination water injection intensity and water injection rate;
6) water filling: inject in this gas condensate reservoir appropriate density ratio crude oil large and with the immiscible simply and easy treat of crude oil after stratum sewage, with renwing stratum energy, displacement condensate;
7) stewing well: utilize the difference injecting stratum sewage and oil density, allow profit fully replace by gravitational differentiation, makes low-density condensate converge to reservoir high-order bit thus be plucked out of;
8) recover the oil: when well head oil pressure return to basicly stable after drive a well and adopt condensate.
2. a kind of fracture-cavity type carbonate gas condensate reservoir water filling according to claim 1 improves condensate recovery ratio method, it is characterized in that: it is better that condensate effect is adopted in the first run time water filling, can carry out multiple round water filling and adopt condensate operation, until without economic benefit.
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Cited By (8)
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| CN105628894A (en) * | 2016-01-13 | 2016-06-01 | 西南石油大学 | Simulation and evaluation system for low-salinity water injection experiment and method |
| CN107038272A (en) * | 2016-11-11 | 2017-08-11 | 福建工程学院 | A kind of rock salt under Action of Gravity Field moves the creation method of water-soluble erosion parameter model |
| CN107288590A (en) * | 2016-04-11 | 2017-10-24 | 中国石油化工股份有限公司 | One kind note CO2Improve the experimental method of Recovery of Gas Condensate Reservoirs |
| CN108868724A (en) * | 2018-06-26 | 2018-11-23 | 中国石油天然气股份有限公司 | Method and device for determining gas lift production increasing oil and gas quantity of condensate gas well |
| CN109973059A (en) * | 2019-03-29 | 2019-07-05 | 中国石油化工股份有限公司 | A kind of rapid analysis method of fracture-pore reservoir gas injection body mechanism |
| CN110067541A (en) * | 2018-01-22 | 2019-07-30 | 中国石油天然气股份有限公司 | Single-well water injection oil replacement method and device for fracture-cavity type carbonate reservoir |
| CN110761754A (en) * | 2018-07-26 | 2020-02-07 | 中国石油天然气股份有限公司 | Water injection method for fracture-cave type carbonate reservoir well group unit |
| CN112483064A (en) * | 2019-09-12 | 2021-03-12 | 中国石油天然气股份有限公司 | Method, device and equipment for determining well arrangement mode of condensate gas reservoir and storage medium |
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| CN107288590A (en) * | 2016-04-11 | 2017-10-24 | 中国石油化工股份有限公司 | One kind note CO2Improve the experimental method of Recovery of Gas Condensate Reservoirs |
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| CN107038272A (en) * | 2016-11-11 | 2017-08-11 | 福建工程学院 | A kind of rock salt under Action of Gravity Field moves the creation method of water-soluble erosion parameter model |
| CN110067541A (en) * | 2018-01-22 | 2019-07-30 | 中国石油天然气股份有限公司 | Single-well water injection oil replacement method and device for fracture-cavity type carbonate reservoir |
| CN108868724A (en) * | 2018-06-26 | 2018-11-23 | 中国石油天然气股份有限公司 | Method and device for determining gas lift production increasing oil and gas quantity of condensate gas well |
| CN108868724B (en) * | 2018-06-26 | 2020-09-08 | 中国石油天然气股份有限公司 | Method and device for determining gas lift production increasing oil and gas quantity of condensate gas well |
| CN110761754A (en) * | 2018-07-26 | 2020-02-07 | 中国石油天然气股份有限公司 | Water injection method for fracture-cave type carbonate reservoir well group unit |
| CN109973059A (en) * | 2019-03-29 | 2019-07-05 | 中国石油化工股份有限公司 | A kind of rapid analysis method of fracture-pore reservoir gas injection body mechanism |
| CN109973059B (en) * | 2019-03-29 | 2020-05-19 | 中国石油化工股份有限公司 | Rapid analysis method for gas injection mechanism of fracture-cavity oil reservoir |
| CN112483064A (en) * | 2019-09-12 | 2021-03-12 | 中国石油天然气股份有限公司 | Method, device and equipment for determining well arrangement mode of condensate gas reservoir and storage medium |
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Inventor after: Deng Xingliang Inventor after: Gu Xingming Inventor after: Tang Yang Inventor after: Cai Zhenzhong Inventor after: Li Shiyin Inventor after: Liu Zhiliang Inventor after: Zhou Denghong Inventor after: Fan Chonghai Inventor after: Li Ying Inventor after: Shen Lei Inventor after: Li Maohui Inventor before: Deng Xingliang Inventor before: Cai Zhenzhong Inventor before: Li Shiyin Inventor before: Liu Zhiliang Inventor before: Zhou Denghong Inventor before: Fan Chonghai Inventor before: Li Ying Inventor before: Shen Lei |
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Effective date of registration: 20170509 Address after: 841000 No. 26, petrochemical Avenue, Korla, Xinjiang Applicant after: TARIM OILFIELD BRANCH, EXPLORATION AND DEVELOPMENT INSTITUTE Applicant after: Shandong wins soft Polytron Technologies Inc Address before: 841000 the Xinjiang Uygur Autonomous Region Bayinguoleng Mongolia Autonomous Prefecture Petrochemical Avenue, Tarim Oilfield Branch exploration and Development Research Institute Applicant before: TARIM OILFIELD BRANCH, EXPLORATION AND DEVELOPMENT INSTITUTE Applicant before: DONGYING SHENGRUAN OIL AND GAS EXPLORATION AND DEVELOPMENT RESEARCH INSTITUTE |
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