CN102748075B - Method for determining minimum design operation pressure of underground salt cavern gas storage - Google Patents
Method for determining minimum design operation pressure of underground salt cavern gas storage Download PDFInfo
- Publication number
- CN102748075B CN102748075B CN201210232958.4A CN201210232958A CN102748075B CN 102748075 B CN102748075 B CN 102748075B CN 201210232958 A CN201210232958 A CN 201210232958A CN 102748075 B CN102748075 B CN 102748075B
- Authority
- CN
- China
- Prior art keywords
- salt
- gas storage
- rock salt
- operating pressure
- storage cavern
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention belongs to the field of development of oil and gas resources, and particularly relates to a method for determining minimum design operation pressure of underground salt cavern gas storage. The method comprises the following steps of: manufacturing a salt rock sample; determining salt rock strength; determining crustal stress; determining safety coefficient; and determining the minimum design operation pressure, wherein the salt rock sample is a slim cylinder; the ratio of height to diameter of the salt rock sample is not less than 2; the length of the salt rock sample is not greater than 200 mm, the diameter is not greater than 80 mm, the surface roughness is not greater than 0.2 mm, and the ellipticity is not greater than 2 percent; the triaxial compression and tensile damage test frequency is not less than 6; a loading mode in a test process is multi-stage loading; the loading time of each stage of load is not less than 2 hours; confining pressure in the test process is hydraulically applied; and hydraulic oil is mineral oil, synthetic hydrocarbon or biological base oil. According to the invention, the method and the steps for determining the minimum design operation pressure of the underground salt cavern gas storage are defined; and the method has extremely high engineering application value and field operability.
Description
Technical field
The invention belongs to petrol resources exploitation field, particularly, relate to gas storage cavern minimal design operating pressure and determine method.
Background technology
In order to guarantee the utilization ratio of salt hole air reserved storeroom peak modulation capacity and raising cushion steam, in salt hole air reserved storeroom running, need to reduce operating pressure as far as possible, the shear stress that salt hole air reserved storeroom country rock is subject to is increased, may cause top, salt cave and the chamber wall destruction of caving in.Therefore, rationally determine that salt hole air reserved storeroom minimal design operating pressure is significant to assurance gas storage safety, raising peak modulation capacity.
Present stage determines that for the minimum operating pressure in salt cave method mainly adopts empirical method, and American scholar MichaelBruno advises that this value is taken as 1/6～1/2 of the highest operating pressure.Can find out that this value excursion is large, it is comparatively remarkable to be affected by human factors.Meanwhile, the method lacks clear and definite theoretical foundation when determining minimum operating pressure, brings safely hidden danger to salt hole air reserved storeroom actual motion.
Patent of the present invention is started with from rock salt three axle tensions and Compressive failure intensity, provides gas storage cavern minimal design operating pressure and determines method, and the minimum operating pressure value of precise quantification scope, defines the mechanics principle that minimum operating pressure designs.The method step is simple, in actual design easy operating, for ensureing that China's gas storage cavern design and running has safely good engineering using value.
Summary of the invention
In order to overcome defect of the prior art, the object of the present invention is to provide a kind of gas storage cavern minimal design operating pressure to determine method, the minimum operating pressure value of precise quantification scope, define the mechanics principle of minimum operating pressure design, solve the difficult problem in the minimum operating pressure deterministic process of gas storage cavern.
Technical scheme of the present invention is as follows:
Gas storage cavern minimal design operating pressure is determined a method, it is characterized in that comprising the steps:
(1), utilize the rock salt sample of getting, be made into and test needed rock salt sample;
(2), rock salt sample that utilize to make, carry out the three axial compression contracting fracture strengths that triaxial test is determined rock salt, carry out the three axle tensile failure intensity that rock salt is determined in triaxial extension test;
(3), according to rock salt distribution of strata feature, geologic parameter and mathematical method, determine the three-dimensional ground stress size on target rock salt stratum, salt hole air reserved storeroom place;
(4), according to rock salt fracture strength and geostatic stress, calculate the country rock safety factor at diverse location place, salt cave while pressing in different, and by safety factor according to sequence from small to large;
(5), when minimum safety factor be greater than 1 and corresponding analog computation in press hour, adopt linear interpolation method to obtain minimum safety factor and equal 1 o'clock corresponding interior pressure and be in the minimum critical of salt cave and press; In order to guarantee that salt cave actual motion is multiplied by design safety factor by pressure in minimum critical safely and obtains gas storage cavern minimal design operating pressure.
Preferably, rock salt sample is elongated cylindrical, and rock salt specimen height and diameter ratio are not less than 2.
Preferably, rock salt specimen length is not more than 200mm, and diameter is not more than 80mm, and surface roughness is not more than 0.2mm, and ovality is not more than 2%.
Preferably, three axial compression contractings and tensile failure test number (TN) all must not be less than 6 times; In process of the test, load mode is multi-stage loading, and every grade of load load time is no less than 2 hours.
Preferably, in process of the test, confined pressure adopts hydraulic pressure to apply, and hydraulic oil is mineral oil, synthetic hydrocarbon or biological base oil.
Preferably, stress acquisition methods comprises acoustic logging, well-shooting and hydraulic fracturing, AE Kaiser effect method, stress relief method, stress measurement in situ, flat jack method, strain restoring method or Borehole Breakout Data primitively.
Preferably, safety factor proof position Yan Xue top; Safety factor calculating reference point is distributed on the straight line by completion tubular column central point, and first calculation level is 20cm position apart from completion tubular column external diameter horizontal range, and the horizontal range between later every adjacent two calculation levels is not more than 1m.
Preferably, design safety factor is taken as 1.2～1.5.
Preferably, rock salt is salt dome type rock salt or many sandwich types rock salt.
The present invention has provided gas storage cavern minimal design operating pressure and has determined method, has accurately determined minimal design operating pressure, has that step is simple, a mechanical mechanism advantage such as clearly; Patent of the present invention has overcome the impact of human factor, make minimal design operating pressure definite workable, can carry out industrialization design and popularization; The present invention has very strong engineering use value, does not significantly increase design cost.
The specific embodiment
Certain plans to build target salt rock stratum, salt hole air reserved storeroom place buried depth is 1000～1255m, contains numerous interlayers in salt rock stratum, and interlayer composition is mainly anhydrite, mud stone and glauberite.The wherein some salt hole air reserved storerooms of take are below determined method as example illustrates gas storage cavern minimal design operating pressure.
Gas storage cavern minimal design operating pressure determines that method concrete steps comprise:
(1), rock salt sample production: obtain the rock salt sample in salt hole air reserved storeroom target rock salt stratum according to on-the-spot drilling extracting core, to rock salt structural damage, adopt dry type saw mill method to carry out the processing of standard specimen for fear of test specimen water in process; First that rock sample is manual according to becoming length to meet the section of requirement of experiment, then, with lathe processing, adopt the very little depth of cut at every turn; Adopt above-mentioned processing method, according to the requirement in < < Hydraulic and Hydro-Power Engineering rock experiment rules-2002 > >, 12 sections of rock samples are processed into the sample that meets requirement of experiment standard, sample characteristics parameter is as shown in table 1; Known by the data in table 1: test specimen maximum length is 162.58mm, maximum gauge is 79.32mm, and surface roughness maximum value is 0.2mm, and ovality maximum value is 1.9%.
The cylindrical standard specimen characteristic parameter of table 1
(2), rock salt intensity is determined: rock salt sample is put in MTS815 Flex Test GT experimental machine rock salt sample is carried out to three axial compression contracting and tension tests.Three axial compression contractings and tension test are respectively carried out to 6 groups of experiments, and every group of experiment all adopts 5 grades of loadings, and loaded rear maintenance load invariant time is 3 hours at every turn, then enters next time and loads; By obtaining rock salt sample failure load, be weighted to average and obtain the average of the three axial compression contractings of rock salt sample and tensile failure intensity, in Table 2; In this test, hydraulic oil is diesel oil.
The cylindrical standard specimen feature of table 2 fracture strength
| Specimen coding | Three axial compression contracting/MPa | Specimen coding | Three axle stretching/MPa |
| 1 | 50.64 | 7 | 36.11 |
| 2 | 48.15 | 8 | 35.23 |
| 3 | 54.63 | 9 | 38.96 |
| 4 | 51.15 | 10 | 35.47 |
| 5 | 52.47 | 11 | 39.41 |
| 6 | 54.32 | 12 | 38.73 |
| Average | 51.89 | Average | 37.32 |
(3), earth stress determination: utilize on-the-spot hydraulic fracturing to obtain the three-dimensional ground stress that salt cave is positioned target salt rock stratum, wherein maximum horizontal principal stress is 22.4MPa, and minimum level main stress bar is 13.8MPa, and vertically stress is 19.2MPa.
(4), safety factor determines: the rock salt fracture strength and the geostatic stress that according to above-mentioned experiment, obtain, calculate respectively interior pressure and be 0,2,3,4,5, during 6MPa salt cave safety top coefficient in Table 3.Wherein first calculation level is 0.2m apart from completion tubular column outer wall horizontal well distance, and all point-blank and this straight-line pass completion tubular column center, the distance of adjacent two calculation levels is 1m for other calculation levels and the first calculation level.Meanwhile,
In table 3 by the safety factor calculating according to sorting from small to large.
Pressure effect next top safety factor in certain design salt hole air reserved storeroom difference of table 3
(5), minimal design operating pressure determines: the result of calculation from table 3 can find out when analog computation in that pressure is 3,4,5, during 6MPa, and the safety factor that calculates diverse location place, top, salt cave is all greater than 1.Now, in corresponding minimum analog computation, press as 3MPa, in therefore selecting, press as 3MPa is as calculating benchmark.From table, result of calculation can also be found when interior pressure is 3MPa, minimum apart from completion tubular column external diameter 0.2m place safety factor, therefore selects this as the calculating reference point of linear interpolation.Because when interior pressure is taken as 3MPa, now minimum safety factor is 1.13, and need to calculate safety factor by linear interpolation method is that 1 o'clock corresponding interior pressure is worth, and interior pressure is now in salt hole air reserved storeroom minimum critical and presses.Can calculate pressure in salt hole air reserved storeroom minimum critical is: 3 ÷ 1.13 * 1.0 ≈ 2.65MPa.In order to guarantee salt hole air reserved storeroom security of operation, design safety factor is taken as 1.5, can obtain this salt hole air reserved storeroom minimal design operating pressure to be: 2.65 * 1.5=3.975MPa ≈ 4MPa.
So far, can obtain this salt hole air reserved storeroom minimal design operating pressure is 4MPa.Known by above-described embodiment, the present invention can obtain salt cave minimal design operating pressure accurately, have operating procedure simple, be subject to that human factor impact is little, the mechanical mechanism advantage such as clearly.
Claims (9)
1. gas storage cavern minimal design operating pressure is determined method, it is characterized in that comprising the steps:
(1), utilize the rock salt sample of getting, be made into and test needed rock salt sample;
(2), rock salt sample that utilize to make, carry out the three axial compression contracting fracture strengths that triaxial test is determined rock salt, carry out the three axle tensile failure intensity that rock salt is determined in triaxial extension test;
(3), according to rock salt distribution of strata feature, geologic parameter and mathematical method, determine the three-dimensional ground stress size on target rock salt stratum, salt hole air reserved storeroom place;
(4), according to rock salt fracture strength and geostatic stress, calculate the country rock safety factor at diverse location place, salt cave while pressing in different, and by safety factor according to sequence from small to large;
(5), when minimum safety factor be greater than 1 and corresponding analog computation in press hour, adopt linear interpolation method to obtain minimum safety factor and equal 1 o'clock corresponding interior pressure and be in the minimum critical of salt cave and press; In order to guarantee that salt cave actual motion is multiplied by design safety factor by pressure in minimum critical safely and obtains gas storage cavern minimal design operating pressure.
2. gas storage cavern minimal design operating pressure according to claim 1 is determined method, it is characterized in that: rock salt sample is elongated cylindrical, and rock salt specimen height and diameter ratio are not less than 2.
3. gas storage cavern minimal design operating pressure according to claim 2 is determined method, it is characterized in that: rock salt specimen length is not more than 200mm, and diameter is not more than 80mm, and surface roughness is not more than 0.2mm, and ovality is not more than 2%.
4. gas storage cavern minimal design operating pressure according to claim 3 is determined method, it is characterized in that: three axial compression contractings and tensile failure test number (TN) all must not be less than 6 times; In process of the test, load mode is multi-stage loading, and every grade of load load time is no less than 2 hours.
5. gas storage cavern minimal design operating pressure according to claim 4 is determined method, it is characterized in that: in process of the test, confined pressure adopts hydraulic pressure to apply, and hydraulic oil is mineral oil, synthetic hydrocarbon or biological base oil.
6. gas storage cavern minimal design operating pressure according to claim 5 is determined method, it is characterized in that: stress acquisition methods comprises acoustic logging, well-shooting, hydraulic fracturing, AE Kaiser effect method, stress relief method, stress measurement in situ, flat jack method strain restoring method or Borehole Breakout Data primitively.
7. gas storage cavern minimal design operating pressure according to claim 6 is determined method, it is characterized in that: Yan Xue top, safety factor proof position; Safety factor calculating reference point is distributed on the straight line by completion tubular column central point, and first calculation level is 20cm position apart from completion tubular column external diameter horizontal range, and the horizontal range between later every adjacent two calculation levels is not more than 1m.
8. gas storage cavern minimal design operating pressure according to claim 7 is determined method, it is characterized in that: design safety factor is taken as 1.2～1.5.
9. gas storage cavern minimal design operating pressure according to claim 8 is determined method, it is characterized in that: rock salt is salt dome type rock salt or many sandwich types rock salt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210232958.4A CN102748075B (en) | 2012-07-06 | 2012-07-06 | Method for determining minimum design operation pressure of underground salt cavern gas storage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210232958.4A CN102748075B (en) | 2012-07-06 | 2012-07-06 | Method for determining minimum design operation pressure of underground salt cavern gas storage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102748075A CN102748075A (en) | 2012-10-24 |
| CN102748075B true CN102748075B (en) | 2014-10-29 |
Family
ID=47028529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210232958.4A Expired - Fee Related CN102748075B (en) | 2012-07-06 | 2012-07-06 | Method for determining minimum design operation pressure of underground salt cavern gas storage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102748075B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110837116B (en) * | 2018-08-15 | 2021-06-01 | 中国石油天然气股份有限公司 | Method for determining operation upper limit pressure of salt cavern gas storage |
| CN109281667B (en) * | 2018-10-25 | 2022-04-15 | 中盐金坛盐化有限责任公司 | Salt cavern minimum pressure optimization method |
| CN110096824B (en) * | 2019-05-08 | 2020-11-10 | 中国科学院武汉岩土力学研究所 | Salt cavern oil storage stability evaluation method |
| CN112362475B (en) * | 2020-11-09 | 2022-05-10 | 重庆科技学院 | Evaluation method for trapped sealing ultimate pressure of oil reservoir type gas storage |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101423142A (en) * | 2008-12-15 | 2009-05-06 | 哈尔滨工业大学 | Natural gas storage method using CO2 as salt-hole underground gas storage cushion gas |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6820696B2 (en) * | 2002-04-25 | 2004-11-23 | Conocophillips Company | Petroleum production utilizing a salt cavern |
-
2012
- 2012-07-06 CN CN201210232958.4A patent/CN102748075B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101423142A (en) * | 2008-12-15 | 2009-05-06 | 哈尔滨工业大学 | Natural gas storage method using CO2 as salt-hole underground gas storage cushion gas |
Non-Patent Citations (8)
| Title |
|---|
| TJ盐穴地下储气库注采气运行动态分析;杨海军等;《石油化工应用》;20100925;第29卷(第9期);第61-65页 * |
| 刘飞等.含有夹层的薄盐层中盐穴储气库运行压力的确定.《天然气工业》.2004,第24卷(第9期),第133-135页. |
| 含有夹层的薄盐层中盐穴储气库运行压力的确定;刘飞等;《天然气工业》;20040930;第24卷(第9期);第133-135页 * |
| 多夹层盐穴储气库最小允许运行压力的数值模拟;王同涛等;《油气储运》;20101125;第29卷(第11期);第877-879页 * |
| 多夹层盐穴储气库群间矿柱稳定性研究;王同涛等;《煤炭学报》;20110515;第36卷(第5期);第790-794页 * |
| 杨海军等.TJ盐穴地下储气库注采气运行动态分析.《石油化工应用》.2010,第29卷(第9期),第61-65页. |
| 王同涛等.多夹层盐穴储气库最小允许运行压力的数值模拟.《油气储运》.2010,第29卷(第11期),第877-879页. |
| 王同涛等.多夹层盐穴储气库群间矿柱稳定性研究.《煤炭学报》.2011,第36卷(第5期),第790-794页. |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102748075A (en) | 2012-10-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102661894B (en) | Jointed rock mass test piece and jointed rock mass and aqueous rock coupling test method | |
| CN102748075B (en) | Method for determining minimum design operation pressure of underground salt cavern gas storage | |
| CN110687141B (en) | Method for analyzing permeability characteristics of reservoir shale in drilling process | |
| Huo et al. | The multi-stage rock fragmentation load prediction model of tunnel boring machine cutter group based on dense core theory | |
| CN108729913B (en) | Controllable shock wave pre-cracking shale reservoir stratum method | |
| CN103498680B (en) | Improve the method for fully mechanized coal face period of beginning mining top-coal recovery rate | |
| Bukowska | Post-peak failure modulus in problems of mining geo-mechanics | |
| CN104777047B (en) | A kind of test method for determining fractured rock loosening strength | |
| CN104763428A (en) | Method of classified divisional grouting reinforcement of collapse columns to enable fully mechanized coal face to directly pass soft collapse column | |
| Feng et al. | Effect of induction unloading on weakening of rock mechanics properties | |
| CN114544367B (en) | Reservoir fracturing property evaluation and fracturing scheme design method based on core experiment | |
| CN103837418A (en) | Loading path method for measuring triaxial rheology characteristic of burst rock | |
| CN109915139B (en) | Hard coal seam mining method for balancing energy to induce plastic damage and preventing power damage | |
| CN102778552B (en) | Experimental method for steering law of directional perforation and fracturing fracture | |
| Liu et al. | A comparative study of hydraulic fracturing with various boreholes in coal seam | |
| CN112881184A (en) | Gravel brittleness index determination method and system based on whole-course stress strain | |
| CN105352798A (en) | Test method for detection of rock mechanical parameters by utilization of rock debris | |
| Zhang | Catastrophe analysis of deep tunnel above water-filled caves | |
| CN104132846B (en) | A kind of tubular pile body concrete total cross-section ruggedness test method | |
| CHENG | Research on hydraulic fracturing and pressure relief technology in ultra-thick coal seam dynamic pressure roadway | |
| CN102608263B (en) | Test method for researching fracture water bursting based on coupling of seepage field and stress field | |
| Xue et al. | Research on damage distribution and permeability distribution of coal seam with slotted borehole | |
| Yu et al. | Study on shear strength of artificial methane hydrate | |
| CN204609873U (en) | Shaft wall stability moves the analogue means becoming and affect by aquifer | |
| Zhibiao et al. | Failure mechanism and constant resistance large deformation control measures of deep soft rock in Qingshui Coal Mine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Yan Yifei Inventor after: Yan Xiangzhen Inventor after: Li Jianzhong Inventor after: Yang Xiujuan Inventor after: Wang Tongtao Inventor after: Yu Benfu Inventor after: Li Qi Inventor before: Yan Yifei Inventor before: Wang Tongtao Inventor before: Yan Xiangzhen Inventor before: Yang Xiujuan Inventor before: Jiang Tingting |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: YAN YIFEI WANG TONGTAO YAN XIANGZHEN YANG XIUJUAN JIANG TINGTING TO: YAN YIFEI YAN XIANGZHEN LI JIANZHONG YANG XIUJUAN WANG TONGTAO YU BENFU LI QI |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141029 Termination date: 20150706 |
|
| EXPY | Termination of patent right or utility model |