CN113738408B - Expansion method for double-well communicated salt cavern gas storage - Google Patents
Expansion method for double-well communicated salt cavern gas storage Download PDFInfo
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- CN113738408B CN113738408B CN202010472555.1A CN202010472555A CN113738408B CN 113738408 B CN113738408 B CN 113738408B CN 202010472555 A CN202010472555 A CN 202010472555A CN 113738408 B CN113738408 B CN 113738408B
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- 150000003839 salts Chemical class 0.000 title claims abstract description 379
- 238000003860 storage Methods 0.000 title claims abstract description 98
- 238000000034 method Methods 0.000 title claims abstract description 50
- 238000004891 communication Methods 0.000 claims abstract description 91
- 238000006073 displacement reaction Methods 0.000 claims abstract description 43
- 238000007599 discharging Methods 0.000 claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 20
- 238000005553 drilling Methods 0.000 claims abstract description 18
- 239000007789 gas Substances 0.000 claims description 95
- 239000012267 brine Substances 0.000 claims description 78
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 78
- 239000000243 solution Substances 0.000 claims description 62
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical group C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 44
- 238000002347 injection Methods 0.000 claims description 41
- 239000007924 injection Substances 0.000 claims description 41
- 238000004090 dissolution Methods 0.000 claims description 27
- 239000000126 substance Substances 0.000 claims description 25
- 239000003345 natural gas Substances 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 230000009977 dual effect Effects 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 238000010276 construction Methods 0.000 claims description 3
- 235000002639 sodium chloride Nutrition 0.000 description 329
- 235000019994 cava Nutrition 0.000 description 13
- 239000004575 stone Substances 0.000 description 13
- 238000010586 diagram Methods 0.000 description 9
- 229910052500 inorganic mineral Inorganic materials 0.000 description 7
- 235000010755 mineral Nutrition 0.000 description 7
- 239000011707 mineral Substances 0.000 description 7
- 230000014759 maintenance of location Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000005065 mining Methods 0.000 description 4
- 239000011259 mixed solution Substances 0.000 description 4
- 239000012535 impurity Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011978 dissolution method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 230000035876 healing Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D13/00—Large underground chambers; Methods or apparatus for making them
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/28—Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/16—Modification of mine passages or chambers for storage purposes, especially for liquids or gases
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The present disclosure provides a method for expanding a double-well communication salt cavern gas storage, the double-well communication salt cavern gas storage includes two salt caverns and a communication channel for communicating the two salt caverns, each salt cavern has a well, the method for expanding the capacity includes: drilling a dilatation well communicated with the communication channel between two wells of the two salt caverns; performing multiple capacity expansion operations on the double-well communicated salt cavern gas storage, wherein the capacity expansion operations comprise: injecting a salt dissolving medium into the wells of the two salt caverns; and injecting displacement medium into the wells of the two salt caverns, and discharging the mixed liquid in the two salt caverns from the expansion well. The double-well communication salt cavern gas storage volume can be increased, and the utilization rate of the double-well communication salt cavern gas storage can be improved.
Description
Technical Field
The disclosure relates to the technical field of salt cavern gas storages, in particular to a capacity expansion method of a double-well communicated salt cavern gas storage.
Background
The salt caves are underground caves formed by mining in a thicker salt layer or a salt dome in the underground by utilizing a water-soluble mining mode, and have huge volumes and good sealing. The high-temperature and high-pressure salt has the characteristic of automatically healing cracks of the mineral seam, so that underground salt caverns can form a good sealed storage, namely a salt cavern gas storage. Salt cavern gas reservoirs can be used to store oil, gas.
In the related art, a vertical well is usually drilled, and a salt cavern gas storage is formed in a mode of creating a dissolution cavity at the bottom of the vertical well. The dissolution cavity refers to a space left after the underground minerals are dissolved, extracted and collected by water injection, for example, a cavity formed after underground rock salt is mined by adopting a water dissolution method. And after the cavity is formed, installing a gas injection pipe column and a halogen discharge pipe column on the vertical well. And then natural gas is injected into the well through the gas injection pipe column, the brine in the solution cavity is pushed by the natural gas to be discharged from the brine discharge pipe column, and then the brine discharge pipe column is lifted out, so that the natural gas is stored in the salt cavern gas storage.
At present, more double-well communicated salt cavern gas storages exist in China, wherein the double-well communicated salt cavern gas storages refer to salt cavern gas storages formed by communicating two solution cavities through channels formed in a mineral seam, wherein the solution cavities are respectively formed at the bottoms of two straight wells.
Usually, the pit volume of the double-well communicated salt cavern gas storage is larger, and the pit is mostly filled with salt-extraction residues. The salt mining residue contains salt layer stones, soluble salts which are not dissolved (fall to the pit in the initial salt mining process, and are not dissolved any more due to the saturation of the lower salt concentration) and brine (mainly existing in the gaps of the pit). Therefore, the formed salt cavern gas storage is small in volume and low in utilization value, so that a large number of double-well communicated salt cavern gas storage is idle.
Disclosure of Invention
The embodiment of the disclosure provides a capacity expansion method of a double-well communication salt cavern gas storage, which can increase the volume of the double-well communication salt cavern gas storage and improve the utilization rate of the double-well communication salt cavern gas storage. The technical scheme is as follows:
the embodiment of the disclosure provides a capacity expansion method of a double-well communication salt cavern gas storage, wherein the double-well communication salt cavern gas storage comprises two salt caverns and a communication channel for communicating the two salt caverns, each salt cavern is provided with a well, and the capacity expansion method comprises the following steps: drilling a dilatation well communicated with the communication channel between two wells of the two salt caverns; performing multiple capacity expansion operations on the double-well communicated salt cavern gas storage, wherein the capacity expansion operations comprise: injecting a salt dissolving medium into the wells of the two salt caverns; and injecting displacement medium into the wells of the two salt caverns, and discharging mixed liquid in the two salt caverns from the expansion well, wherein the mixed liquid at least comprises a mixture of the salt dissolving medium and salt substances in the two salt caverns.
In an implementation manner of the embodiment of the present disclosure, before performing the capacity expansion operation on the double-well communication salt cavern gas storage for multiple times, the capacity expansion method further includes: and injecting the displacement medium into the wells of the two salt caverns, and discharging the original brine in the solution cavities of the two salt caverns from the expansion well.
In another implementation of the embodiment of the present disclosure, the injecting the displacement medium into the wells of the two salt caverns, and discharging the raw brine in the solution cavities of the two salt caverns from the expansion well includes: installing a filling and discharging device in the wells of the two salt caverns, wherein the filling and discharging device extends from the wellhead of the wells of the two salt caverns to the dissolution cavities of the two salt caverns; injecting the displacement medium into the solution cavities of the two salt caverns through the injection and discharge device, so that the original brine is discharged from the expansion well until the liquid level of the original brine is not higher than the surfaces of the bottoms of the two salt caverns.
In another implementation manner of the embodiment of the present disclosure, the injection and drainage device includes: the first filling pipe and the second filling pipe are coaxially sleeved on the second filling pipe, and the length of the second filling pipe is larger than that of the first filling pipe; the injecting the salt dissolving medium into the wells of the two salt caverns comprises: injecting the salt dissolving medium into the solution cavities of the two salt cavities from the second injection and discharge pipe; the injecting displacement medium into the wells of the two salt caverns comprises: and injecting the displacement medium from the first injection and discharge pipe to the solution cavities of the two salt caverns.
In another implementation of an embodiment of the disclosure, drilling a dilatation well in communication with the communication channel between two wells of the two salt caverns includes: drilling a capacity expansion well between two wells of the two salt caverns; installing an expansion inner pipe and an expansion outer pipe in the expansion well, wherein the expansion outer pipe is coaxially sleeved on the expansion inner pipe, and the length of the expansion inner pipe is longer than that of the expansion outer pipe; and forming a dilatation well dissolving cavity at the bottom of the dilatation well, so that the dilatation well dissolving cavity is communicated with the communication channel.
In another implementation of an embodiment of the disclosure, the discharging the mixed liquor in the two salt caverns from the expansion well further includes: and injecting the displacement medium from the expansion outer pipe to the expansion well so as to displace the salt-dissolving medium from the expansion inner pipe to discharge the expansion well.
In another implementation of an embodiment of the present disclosure, drilling a dilatation well between two wells of the two salt caverns includes: determining a target point on the communication channel, and drilling the target point to form a hole; and installing a casing in the hole to form a dilatation well.
In another implementation manner of the embodiment of the present disclosure, the forming a expansion well solution cavity at a bottom of the expansion well includes: and performing water-soluble cavity construction operation at the bottom of the dilatation well to form a dilatation well soluble cavity communicated with the dilatation well and the communication channel.
In another implementation of the disclosed embodiments, the displacement medium is natural gas.
In another implementation of the disclosed embodiments, the salt-dissolving medium is water.
The technical scheme provided by the embodiment of the disclosure has the beneficial effects that at least:
according to the expansion method for the double-well communication salt cavern gas storage, firstly, an expansion well communicated with a communication channel is drilled between two wells of two salt caverns. I.e. to drill a dilatation well in the seam between two vertical wells in two salt caverns. And the drilled dilatation well can be communicated with a communication channel which is communicated with the two salt caverns. And then, carrying out multiple capacity expansion operations on the double-well communicated salt cavern gas storage. Wherein the expansion operation comprises injecting a salt dissolving medium into the wells of the two salt caverns, and dissolving the soluble salt which is not dissolved in the solution cavities of the two salt caverns by the salt dissolving medium. The volume of the pit is gradually reduced along with the gradual dissolution of the salt substances, so that more free space is reserved in the dissolution cavities of the two salt caverns. Then, the displacement medium can be injected from two wells of the two salt caverns, and the displacement medium is utilized to push the mixed liquid in the two salt caverns in the solution cavities of the two salt caverns to enter the expansion well through the communication channel. In addition, in the process of pushing the mixed liquid in the two salt caverns to move to the expansion well by using the displacement medium, a certain amount of brine exists in the gaps of the bottom pits of the two salt caverns, and the brine existing in the gaps of the bottom pits can be displaced to the expansion well, so that the space available for storing natural gas in the dissolution cavity of the salt caverns is further enlarged. And finally, discharging the mixed liquid in the two salt caverns, so that the mixed liquid in the two salt caverns cannot return to the dissolution cavity of the two salt caverns, and the expansion of the double-well communicated salt cavern gas storage can be completed.
According to the embodiment of the disclosure, the soluble salt in the bottom pits of the two salt caverns is dissolved by the salt dissolving medium to obtain the mixed solution, and the mixed solution in the two salt caverns is discharged out of the solution cavities of the two salt caverns through the drilled expansion wells, so that the volume of the double-well communicated salt cavern gas storage is greatly increased. Meanwhile, through multiple expansion operations, the soluble salt in the bottom pits of the two salt caverns can be dissolved to the greatest extent, so that the volume of the double-well communicated salt cavern gas storage is increased to the greatest extent. The capacity expansion method provided by the embodiment of the disclosure enables the idle double-well communication salt cavern gas storage to be reused, and improves the utilization rate of the double-well communication salt cavern gas storage.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1 is a schematic structural view of an underground salt cavern gas storage provided in the related art;
FIG. 2 is a schematic diagram of a dual well communication salt cavern gas storage of the related art;
FIG. 3 is a flow chart of a method for expanding a double well connected salt cavern gas storage according to an embodiment of the present disclosure;
FIG. 4 is a flow chart of another method for expanding a double well connected salt cavern gas storage according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of a first stage of expansion of a dual well communication salt cavern gas storage according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of a second stage of capacity expansion of a dual well communication salt cavern gas storage according to an embodiment of the present disclosure;
fig. 7 is a schematic diagram of a third stage of capacity expansion of a dual well communication salt cavern gas storage according to an embodiment of the present disclosure.
Detailed Description
For the purposes of clarity, technical solutions and advantages of the present disclosure, the following further details the embodiments of the present disclosure with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an underground salt cavern gas storage provided in the related art. As shown in fig. 1, the salt cavern gas storage is a single-well salt cavern gas storage, and the single-well salt cavern gas storage comprises a vertical well 1 and a solution cavity 2 communicated with the vertical well 1. And the vertical well 1 comprises a casing 11 and a production pipe column 12 arranged in the casing 11, a packer 13 is arranged between the casing 11 and the production pipe column 12, and a safety valve 14 is arranged in the production pipe column 12.
The dissolving cavity in the single-well salt cavern gas storage is formed by adopting a water dissolving method. The concrete process is that clear water is injected into the bottom of the vertical well from the production pipe column of the vertical well, so that soluble salt in the mineral layer is dissolved by the clear water to form brine 21, and solid matters in the mineral layer are gradually reduced, so that a cavity communicated with the vertical well, namely a dissolution cavity 2, is formed in the mineral layer. Impurities and stones are not easy to dissolve in the dissolving cavity, and cannot be discharged out of the dissolving cavity along with the brine 21 in the cavity making process, so that the impurities and stones are accumulated at the bottom of the cavity to finally form a pit 22.
As shown in fig. 1, if the soluble salt content in the seam is high, a larger solution cavity can be formed, and the pit occupies only a small part of the volume of the solution cavity. If the content of soluble salt in the ore layer is small, the formed solution cavity pit occupies most of the volume, so that the formed solution cavity is small in volume.
Fig. 2 is a schematic structural diagram of a dual well communication salt cavern gas storage provided in the related art. As shown in fig. 2, the dual well salt cavern gas storage includes: the two salt caves are provided with two vertical wells 1, the two vertical wells 1 and the dissolving cavities 2 respectively communicated with the two vertical wells 1, and the two dissolving cavities 2 are communicated through a communication channel 3, namely the two salt caves are communicated through the communication channel 3. A production string 12 is installed in each of the two vertical wells 1 for injecting or discharging natural gas or brine.
As shown in fig. 2, the salt content of the ore bed in the double-well communication salt cavern gas storage is lower, so that the volume of a solution cavity 2 formed at the bottom hole positions of two vertical wells 1 is smaller. Namely, the formed pit 22 is closer to the bottom of the vertical well 1, and stones and impurities with different sizes accumulated in the pit 22 are mutually overlapped and supported, so that the formed pit contains a large number of gaps, and the gaps can be filled with brine, so that the pit 22 can occupy more than 50% of the total volume of the solution cavity 2. In addition, brine 21 is filled above a pit 22 in the solution cavity 2, which is inconvenient for storing substances such as petroleum, natural gas and the like. Therefore, the existing large number of double-well communication salt cavern gas storages are in an idle state.
In order to improve the utilization rate of the double-well communication salt cavern gas storage, the embodiment of the disclosure provides a capacity expansion method of the double-well communication salt cavern gas storage. Fig. 3 is a flow chart of a method for expanding a double well communication salt cavern gas storage according to an embodiment of the present disclosure. As shown in fig. 3, the capacity expansion method includes:
step 101: and drilling a dilatation well communicated with the communication channel between two wells of the two salt caverns.
The expansion well can be communicated with the communicating channel which is communicated with the dissolving cavities of the two wells, so that the expansion well is also communicated with the dissolving cavities of the two wells of the double-well communicating salt cavern gas storage.
Step 102: and performing multiple expansion operations on the double-well communicated salt cavern gas storage.
Wherein, the dilatation operation includes:
in the first step, a salt dissolving medium is injected into the wells of two salt caverns.
Salt dissolving medium is injected into two wells of the two salt caverns to dissolve salt substances in the solution cavities of the two salt caverns. Namely, salt substances are dissolved in a salt-dissolving medium to form a mixture, and the obtained mixture is brine.
And secondly, injecting displacement medium into the wells of the two salt caverns, and discharging the mixed liquid in the two salt caverns from the expansion well.
Wherein the mixed solution at least comprises a salt dissolving medium and a mixture of salt substances in two salt cavities. That is, the mixed liquor may include a mixture of salt species in two salt caverns dissolved in a salt-dissolving medium and brine present in itself in two salt caverns, for example, in the voids of the bottom pit of a salt cavern.
The displacement medium is insoluble in and does not react with brine. Therefore, by injecting displacement medium into the two wells of the two salt caverns, brine in the solution cavities of the two salt caverns can be pushed to move to the expansion well through the communication channel, and finally the brine is displaced to the expansion well.
According to the expansion method for the double-well communication salt cavern gas storage, firstly, an expansion well communicated with a communication channel is drilled between two wells of two salt caverns. Namely, the expansion well is drilled at the position between two straight wells which are positioned on the ore deposit and are communicated with the salt cavern gas storage. And the drilled dilatation well can be communicated with a communication channel which is communicated with the two salt caverns. And then, carrying out multiple capacity expansion operations on the double-well communicated salt cavern gas storage. The expansion operation comprises injecting a salt dissolving medium into the wells of the two salt caverns, and dissolving the soluble salt (namely salt substances) which are not dissolved in the solution cavities of the two salt caverns of the double-well communicated salt cavern gas storage through the salt dissolving medium. The salt substances are filled in the salt layer stones of the solution cavities of the two salt caves, so that the salt substances and the salt layer stones form a pit together and fill most of the volume of the double-well communicated salt cavern gas storage. The pit volume of two salt caverns of the double-well communicated salt cavern gas storage is larger. At this time, salt substances in salt layer stones of the solution cavities of the two salt cavities can be dissolved to form brine by injecting a salt dissolving medium into the solution cavities of the two salt cavities. The salt substances are dissolved and become liquid brine, and the volume of the pit is gradually reduced along with the gradual dissolution of the salt substances, so that more free space is reserved in the dissolution cavities of the two salt cavities. After most of salt substances are dissolved, a displacement medium can be injected from two wells of two salt caves, the displacement medium is insoluble in brine and cannot react with the brine, the displacement medium injected into the dissolution cavity of the two salt caves is gradually increased, the displacement medium can gradually fill the whole dissolution cavity of the two salt caves and push brine in the dissolution cavity of the two salt caves, the displacement medium moves to a deeper position from a gap in a salt layer stone of a double-well communicated salt cavern gas storage, and finally the brine in the dissolution cavity of the two salt caverns is pushed into the expansion well through a communication channel. Even if more free space exists in the solution cavities of the two salt caverns, the volume of the double-well communicated salt cavern gas storage is expanded. In addition, in the process of pushing the mixed liquid in the two salt caverns to move to the expansion well by using the displacement medium, a certain amount of brine exists in the gaps of the bottom pits of the two salt caverns, and the brine existing in the gaps of the bottom pits can be displaced to the expansion well, so that the space available for storing natural gas in the dissolution cavity of the salt caverns is further enlarged. Finally, discharging the brine in the expansion well, so that the brine cannot return to the solution cavity of the double-well communicated salt cavern gas storage, and the expansion of the double-well communicated salt cavern gas storage can be completed. According to the embodiment of the disclosure, the soluble salt in the bottom pits of the two salt caverns is dissolved, and the formed brine is discharged out of the dissolution cavities of the two salt caverns through the drilled expansion well, so that the volume of the double-well communicated salt cavern gas storage is greatly increased, the idle double-well communicated salt cavern gas storage can be reused, and the utilization rate of the double-well communicated salt cavern gas storage is improved. According to the embodiment of the disclosure, the soluble salt in the bottom pits of the two salt caverns can be dissolved to the greatest extent through multiple capacity expansion operations, so that the volume of the double-well communicated salt cavern gas storage is increased to the greatest extent.
Fig. 4 is a flow chart of another method for expanding a double well communication salt cavern gas storage according to an embodiment of the present disclosure. As shown in fig. 4, the capacity expansion method includes:
step 201: and drilling a dilatation well communicated with the communication channel between two wells of the two salt caverns.
Fig. 5 is a schematic diagram of a first stage of capacity expansion of a dual well communication salt cavern gas storage according to an embodiment of the present disclosure. As shown in fig. 5, the first stage of expansion is to drill a expansion well 4 at a location between two vertical wells 1. The specific process of drilling the dilatation well 4 may include the following three steps:
in a first step, a dilatation well is drilled between two wells of two salt caverns.
The specific process of drilling the dilatation well can be as follows:
a point on the communication channel 3 can be selected as a target point, after the target point is set, drilling is carried out to the target point through a drilling tool, and a hole is drilled in a mineral seam; then, a casing is installed in the hole in the axial direction of the hole and the casing is fixed to form a capacity-enlarging well bore, so as to obtain a expansion Rong Jing. The thus formed expansion well 4 can communicate with the communication channel 3 at the target point.
Illustratively, as shown in fig. 5, the dilatation wellbore 41 may be disposed at a location on the seam between two vertical wells 1 of two salt caverns. After the well of the dilatation well 41 is completed, the bottom part of the dilatation well 41 is communicated with the communication channels 3 between the two wells and the dissolution cavities 2 (namely, the dilatation well 41 is communicated with the communication channels 3 communicating two salt caverns), so that the purpose that the dilatation well 4 is simultaneously communicated with the dissolution cavities 2 of the two wells of the two salt caverns is achieved.
Because the scouring effect of brine in the communication channel 3, the diameter of the communication channel 3 is enlarged to a certain extent compared with the diameter of the main body part of the salt cavern when the horizontal drill is adopted in the salt mine exploitation process, but the diameter of the communication channel 3 is far smaller than the diameter of the main body part of the salt cavern, the shape of the communication channel cannot be accurately measured by a general geophysical well logging method, the shape change of a salt cavity can be inverted according to the volume of the salt cavern, the insoluble content and the downhole operation record, the shape of the communication channel is predicted, and the determination of a target point can be facilitated by combining the shape of the communication channel.
And a second step of installing an expansion inner pipe and an expansion outer pipe in the expansion well, wherein the expansion outer pipe is coaxially sleeved on the expansion inner pipe, and the length of the expansion inner pipe is larger than that of the expansion outer pipe.
Illustratively, as shown in fig. 5, a coaxial spacer sleeved inner and outer dilatation tubes 42, 43 are installed within a dilatation wellbore 41. Both the inner and outer expansion tubes 42, 43 extend from the wellhead location of the expansion well as a starting point to the bottom of the expansion well. And the length of the expansion inner pipe 42 is larger than the length of the expansion outer pipe 43, i.e. the expansion outer pipe 43 is closer to the bottom of the well of the expansion Rong Jing than the expansion inner pipe 42.
The annulus between the inner and outer expansion pipes 42 and 43 and the inner expansion pipe 42 can be used as the medium conveying passage, so that the inner expansion pipe 42 and the outer expansion pipe 43 are coaxially arranged to facilitate the injection and discharge of the materials in the expansion well.
In the embodiment of the disclosure, in order to prevent the annulus between the expansion outer tube 43 and the expansion well from affecting the injection and discharge of the material in the expansion well, a packer is provided between the expansion outer tube 43 and the expansion well to block the annulus between the expansion outer tube 43 and the expansion well, thereby preventing the injection and discharge of the material in the expansion well.
Meanwhile, a safety valve is arranged in the expansion inner pipe 42, when the ground or underground is abnormal, the expansion inner pipe 42 can be cut off in time through a ground control system, and injection of substances into the expansion well or discharge of substances in the expansion well are prevented, so that operation safety is ensured.
Third, the bottom of the dilatation well is injected with the salt dissolving medium through the dilatation inner tube 42, and a dilatation well dissolving cavity 44 is formed at the bottom of the dilatation well 4.
The specific steps of forming the expansion well solution chamber 44 at the bottom of the expansion well 4 may include: after the formation of the dilatation well 4, a water-soluble cavity creating operation is performed at the bottom of the dilatation well 4 to form a dilatation Rong Jingrong cavity 44 communicating the dilatation well 4 with the communication channel 3.
As shown in fig. 5, the dilatation well 4 communicates with the communication passage 3 through the dilatation well solution chamber 44. Because of the formation dip angle and lithology change, errors usually exist with the target point in the process of drilling the expansion well 4, so that the expansion well 4 is not connected with the communication channel 3, after the expansion well 4 is formed, the expansion well dissolving cavity 44 can be formed through water dissolving cavity making operation, so that the expansion well dissolving cavity 44 is communicated with the communication channel 3, and the expansion well 4 can be connected with the communication channel 3.
In the process of water-soluble cavity making, the following method can be specifically adopted:
an initial solution cavity is formed at the bottom of the dilatation well 4 through water dissolution cavity making operation. Then, by performing water injection operation to the bottoms of the two expansion wells 4 in the expansion inner pipe 42 of the expansion well 4, when brine is discharged from the wellhead of the expansion well 4, water injection is stopped. When no brine is discharged from the wellhead of the expansion well 4, the water-soluble cavity making operation and the water injection operation are repeated until brine is discharged from the wellhead of the expansion well 4. The water-soluble cavity-making operation is performed by injecting water step by step so that the diameter of the initial cavity is gradually increased to obtain a cavity 44 of the expansion well which is finally communicated with the communication passage 3 (see fig. 5). Namely, clear water is injected into the bottom position of the dilatation well shaft through the dilatation inner pipe 42, and soluble salt in the ore layer is dissolved by the clear water, so that a dilatation well dissolving cavity 44 communicated with the communication channel 3 is formed in the ore layer, and the dilatation well communicated with the communication channel 3 is obtained.
Alternatively, brine may be formed after soluble salts in the seam dissolve in the clean water, at which point a displacement medium, such as natural gas, may be injected into the expansion well bore 44 of the expansion well from the outer expansion tube 43. To drive the brine in the solution cavity of the expansion well to be discharged from the expansion inner pipe 42, so that more cavities are arranged in the solution cavity 44 of the expansion well to facilitate the subsequent absorption of the brine displaced from the solution cavity of the double well communication salt cavern gas storage.
In the implementation mode, the expansion well dissolution cavity is formed at the bottom of the expansion well, so that the expansion well can conveniently absorb brine displaced from the dissolution cavity of the double-well communicated salt cavern gas storage in the subsequent flow. Meanwhile, the contact area between the expansion well and the communication channel is increased by the expansion well dissolution cavity, so that brine can enter the expansion well more easily from the dissolution cavity of the double-well communication salt cavern gas storage.
Step 202: and injecting displacement medium into the wells of the two salt caverns, and discharging the original brine in the solution cavities of the two salt caverns from the expansion well.
The original brine is brine originally existing in the solution cavities of the two salt caverns. That is, prior to performing the expansion method of the double well communication salt cavern gas storage of the present disclosure, the method exists in the solution cavities of two salt caverns.
Fig. 6 is a schematic diagram of a second stage of capacity expansion of a dual well communication salt cavern gas storage according to an embodiment of the present disclosure. As shown in fig. 6, the second stage of expansion is to displace the original brine 51 in the two vertical wells 1 in the double well communication salt cavern gas storage to the expansion well 4. And a specific displacement process may include the following two steps:
and the first step, arranging an injection and drainage device in two wells of the double-well communicated salt cavern gas storage, wherein the injection and drainage device extends from the wellhead of the two wells of the two salt caverns to the dissolution cavity of the two salt caverns.
Wherein, annotate row device can include: a first filling pipe 15 and a second filling pipe 16, wherein the first filling pipe 15 is coaxially sleeved on the second filling pipe 16, and the length of the second filling pipe 16 is longer than that of the first filling pipe 15.
Illustratively, as shown in fig. 6, a first injector tube 15 and a second injector tube 16 are mounted in two wells of two salt caverns coaxially spaced apart. The first injection and discharge pipes 15 and 16 each extend from the wellhead positions of the two wells of the two salt caverns to the bottoms of the two wells of the two salt caverns. And the length of the second filling pipe 16 is larger than that of the first filling pipe 15, namely, the first filling pipe 15 is close to the bottoms of two wells of two salt caverns compared with the second filling pipe 16.
The annular space between the first injection and discharge pipe 15 and the second injection and discharge pipe 16 can be used as a passage for conveying medium, so that injection and discharge of materials in two wells of two salt caverns are facilitated by arranging the first injection and discharge pipe 15 and the second injection and discharge pipe 16 coaxially.
In the embodiment of the disclosure, in order to avoid that the annulus between the first injection and discharge pipe 15 and the second injection and discharge pipe 16 affects the injection and discharge of the two-well substances of the two salt caverns, a packer is arranged between the first injection and discharge pipe 15 and the second injection and discharge pipe 16 to block the annulus between the first injection and discharge pipe 15 and the second injection and discharge pipe 16, thereby preventing the injection and discharge of the two-well substances of the two salt caverns.
And secondly, injecting displacement medium into the solution cavities of the two salt caves through an injection and drainage device, so that the liquid level of the original brine is not higher than the surfaces of the bottoms of the two salt caves.
Wherein, the pit is formed by the way that the soluble salt which is not dissolved in the salt pit falls to the bottom of the salt pit and is piled up in the early stage of the construction of the salt pit.
The real-time liquid level of the original brine can be obtained by modeling and calculating by detecting wellhead pressure of wells of two salt caverns and density of the original brine. For a specific calculation procedure, reference may be made to the related art. The surface position of the pits of the two salt caverns can be measured by sonar to determine the depth position of the pits of the two salt caverns, and the surface of the pits of the two salt caverns is determined by the depth position.
In combination with the above structure of the injection and drainage device, the second step may include: a displacement medium, for example natural gas, is injected into the solution chambers of the two salt caverns through the first injection and discharge pipe 15. As the injected natural gas 6 increases gradually, the natural gas 6 gradually fills the whole dissolving cavities 2 of the two salt caverns, pushes the original brine 51 in the dissolving cavities 2 of the two salt caverns, moves deeper from the gaps in the salt layer stone of the double-well communicated salt cavern gas storage, and finally pushes the original brine 51 in the dissolving cavities 2 of the two wells of the two salt caverns into the expansion well 4.
At this stage, the level of the raw brine 51 is approaching level with the surface of the pit 22 of both salt caverns, as shown in fig. 6. That is, most of the original brine 51 in the two salt caverns can enter the gaps in the salt layer stones of the two salt caverns and is displaced into the expansion Rong Jingrong cavity 44 of the expansion well 4 through the communication channel 3. The liquid level of the original brine 51 is not higher than the surface of the pit 22 of the two salt caverns, so that the dissolution cavities of the two salt caverns have more space for filling natural gas.
As can be seen from the above-mentioned inner and outer dilatation tubes 42 and 43, the discharging of the raw brine from the dilatation wells in the solution chambers of the two salt caverns in step 202 may include: by injecting a displacement medium, such as natural gas 6, from the outer casing 43 into the well bore cavity 44 of the well. To drive the raw brine 51 within the expansion Rong Jingrong chamber 44 of the expansion Rong Jing 4 out of the inner expansion tube 42.
Step 203: and performing multiple expansion operations on the double-well communicated salt cavern gas storage.
Because of the limited salt substances in the bottom pit which can be dissolved in one expansion operation per cycle, the volume expanded by the double-well communicated salt cavern gas storage is limited. Therefore, the soluble salt in the bottom pits of the two salt caverns can be dissolved to the greatest extent through multiple circulating capacity expansion operations, and the volume of the double-well communicated salt cavern gas storage can be increased to the greatest extent.
The specific time to stop the cyclic expansion operation in step 203 may be determined in the following two ways.
First, the volume of the salt cavern can be surveyed after a certain number of cycles of dilatation operations (e.g., 3 to 5 times). Stopping the capacity expansion operation after the volume of the salt cavern reaches the expected volume; if the volume of the salt cavern does not reach the expected volume, the cyclic capacity expansion operation is continued until the volume of the salt cavern reaches the expected volume.
Second, the concentration of brine discharged from the expansion well can be detected, and the lower the concentration of the discharged brine, the less undissolved salt in the salt cavern, and the smaller the space available for expansion in the salt cavern.
Illustratively, if the brine exiting the expansion well has a concentration not higher than the desired concentration (e.g., 5% to 10%), the expansion operation may be stopped; and if the concentration of the brine discharged from the expansion well exceeds the expected concentration, continuing to circulate the expansion operation until the concentration of the discharged brine is not higher than the expected concentration.
Wherein, the dilatation operation includes:
in the first step, a salt dissolving medium is injected into the wells of two salt caverns.
In the first step, salt dissolving medium is injected into two wells of two salt caverns to dissolve salt substances in the solution cavities of the two salt caverns. Namely, salt substances are dissolved in a salt-dissolving medium to form a mixture, and the obtained mixture is brine.
Fig. 7 is a schematic diagram of a third stage of capacity expansion of a dual well communication salt cavern gas storage according to an embodiment of the present disclosure. As shown in fig. 7, the third stage of expansion is to inject the salt-dissolving medium into two vertical wells with two salt caverns to form brine, and displace the salt-dissolving medium with soluble salt into the expansion well 4. Wherein, the process of injecting the salt dissolving medium is as follows:
as can be seen from the structure of the injection and drainage device, as shown in fig. 7, the process of injecting the salt dissolving medium in the first step may include: a salt-dissolving medium is injected into the solution cavities 2 of the two salt cavities from the second injection and discharge pipe 16.
The salt dissolving medium can be water, and as the original brine in the solution cavities of the two salt caverns is displaced into the gaps and the dilatation wells in the salt layer stones of the two salt caverns, the water is injected again at the moment, so that the contact area between the water and the pit can be increased, and the full contact of the clean water and the undissolved soluble salt in the pit is ensured, so that the soluble salt is dissolved in the clean water to form brine.
In the first step of the expansion operation, by injecting water into the solution cavities of the two salt caves, salt substances in salt layer stones in the solution cavities of the two salt caves can be dissolved to form brine. The salt substances are dissolved and then mixed with the liquid salt dissolving medium to form brine, and the volume of the pit 22 is gradually reduced along with the gradual dissolution of the salt substances, so that more free space is reserved in the solution cavities 2 of the two salt cavities.
And secondly, injecting displacement medium into the wells of the two salt caverns, and discharging the mixed liquid in the two salt caverns from the expansion well.
Wherein the mixed solution at least comprises a mixture of the salt-dissolving medium and salt substances in the two salt cavities. That is, the mixed liquor may include a mixture of salt species in two salt caverns dissolved in a salt-dissolving medium and brine present in itself in two salt caverns, for example, in the voids of the bottom pit of a salt cavern.
The displacement medium injected in the second step is insoluble in brine and does not react with brine. Therefore, by injecting displacement media into the two wells of the two salt caverns, brine (soluble salt media dissolved with soluble salt) in the solution cavities of the two salt caverns can be pushed to move to the expansion well through the communication channel, and finally the soluble salt media are displaced to the expansion well.
As can be seen from the above structure of the injection and drainage device, as shown in fig. 7, the process of injecting the displacement medium in the second step of the capacity expansion operation may include: the displacement medium is injected from the first injection and discharge pipe 15 into the solution cavity 2 of the double well communication salt cavern gas storage.
As shown in fig. 7, the displacement medium may be natural gas 6, because the natural gas 6 is insoluble in brine and does not react with the brine, the natural gas 6 injected into the solution cavities 2 of the two salt caverns gradually increases, the natural gas 6 gradually fills the whole solution cavities 2 of the two salt caverns and pushes the brine (the solution salt medium 52 dissolved with the soluble salt) in the solution cavities 2 of the two salt caverns, and moves deeper from the gaps in the salt layer stones of the two salt caverns, and finally pushes the solution salt medium 52 dissolved with the soluble salt in the solution cavities 2 of the two wells of the two salt caverns into the expansion well 4.
In combination with the inner and outer expansion pipes 42 and 43 provided in the expansion well, the discharging of the mixed liquid in the two salt pockets from the expansion well in the second step of the expansion operation may include: a displacement medium, such as natural gas 6, is injected from the outer casing 43 into the well bore cavity 44 of the well. To drive the brine medium 52 having the soluble salts dissolved therein within the expansion well bore 44 of the expansion well out of the expansion well from the expansion inner tube 42.
In the process of discharging the salt-dissolving medium, the displacement medium is injected into both wells of the two salt caverns at the same time, so that the displacement medium injected into the expansion well 4 is used for pressing the salt-dissolving medium 52 in the expansion Rong Jingrong cavity 44 of the expansion well 4 together with the displacement medium, and the salt-dissolving medium 52 in the expansion Rong Jingrong cavity 44 of the expansion Rong Jing is driven to be discharged from the expansion inner pipe 42.
According to the embodiment of the disclosure, the soluble salt in the bottom pits of the double-well communicated salt cavern gas storage is dissolved, and the formed brine is discharged out of the solution cavity of the double-well communicated salt cavern gas storage through the drilled dilatation well, so that the volume of the double-well communicated salt cavern gas storage is greatly increased, and in the process of pushing the soluble salt medium with the soluble salt in the two salt caverns to move to the dilatation well by using natural gas, a certain amount of brine also exists in the gaps of the bottom pits of the two salt caverns, and the brine existing in the gaps of the bottom pits can be displaced to the dilatation well, so that the space available for storing the natural gas in the solution cavity of the salt caverns is further enlarged, namely the volume of the double-well communicated salt cavern gas storage is increased. The unused double-well communication salt cavern gas storage can be reused, and the utilization rate of the double-well communication salt cavern gas storage is improved.
The foregoing disclosure is not intended to be limited to any form of embodiment, but is not intended to limit the disclosure, and any simple modification, equivalent changes and adaptations of the embodiments according to the technical principles of the disclosure are intended to be within the scope of the disclosure, as long as the modifications or equivalent embodiments are possible using the technical principles of the disclosure without departing from the scope of the disclosure.
Claims (8)
1. A method of expanding a double well communication salt cavern gas storage comprising two salt caverns and a communication channel communicating the two salt caverns, each of the salt caverns having a well, the method comprising:
drilling a dilatation well communicated with the communication channel between two wells of the two salt caverns;
installing a filling and discharging device in the wells of the two salt caverns, wherein the filling and discharging device extends from the wellhead of the wells of the two salt caverns to the dissolution cavities of the two salt caverns;
injecting displacement medium into the solution cavities of the two salt caverns through the injection and discharge device, so that original brine is discharged from the expansion well until the liquid level of the original brine is not higher than the surfaces of the bottoms of the two salt caverns;
performing multiple capacity expansion operations on the double-well communicated salt cavern gas storage, wherein the capacity expansion operations comprise:
injecting a salt dissolving medium into the wells of the two salt caverns;
injecting the displacement medium into the wells of the two salt caverns, and discharging mixed liquid in the two salt caverns from the expansion well, wherein the mixed liquid at least comprises a mixture of the salt dissolving medium and salt substances in the two salt caverns;
stopping the expansion operation when the concentration of the mixed liquor discharged from the expansion well is not higher than the expected concentration; or,
and stopping the expansion operation when the volume of the salt cavern reaches the expected volume.
2. The method for expanding a double well communication salt cavern gas storage according to claim 1, wherein the injection and drainage device comprises: the first filling pipe and the second filling pipe are coaxially sleeved on the second filling pipe, and the length of the second filling pipe is larger than that of the first filling pipe;
the injecting the salt dissolving medium into the wells of the two salt caverns comprises:
injecting the salt dissolving medium into the solution cavities of the two salt cavities from the second injection and discharge pipe;
the injecting displacement medium into the wells of the two salt caverns comprises:
and injecting the displacement medium from the first injection and discharge pipe to the solution cavities of the two salt caverns.
3. The method of expanding a double well communication salt cavern gas storage of claim 1, wherein drilling a expansion well in communication with the communication channel between two wells of the two salt caverns comprises:
drilling a capacity expansion well between two wells of the two salt caverns;
installing an expansion inner pipe and an expansion outer pipe in the expansion well, wherein the expansion outer pipe is coaxially sleeved on the expansion inner pipe, and the length of the expansion inner pipe is longer than that of the expansion outer pipe;
and forming a dilatation well dissolving cavity at the bottom of the dilatation well, so that the dilatation well dissolving cavity is communicated with the communication channel.
4. A method of expanding a double well communication salt cavern gas storage as set forth in claim 3 wherein said discharging the mixed liquor in said two salt caverns from said expansion well further comprises:
and injecting the displacement medium from the expansion outer pipe to the expansion well so as to displace the salt-dissolving medium from the expansion inner pipe to discharge the expansion well.
5. A method of expanding a dual well communication salt cavern gas storage as set forth in claim 3 wherein drilling an expansion well between two wells of said two salt caverns comprises:
determining a target point on the communication channel, and drilling the target point to form a hole;
and installing a casing in the hole to form a dilatation well.
6. A method of expanding a double well communication salt cavern gas storage as claimed in claim 3 wherein said forming a expansion well solution cavity at the bottom of said expansion well comprises:
and performing water-soluble cavity construction operation at the bottom of the dilatation well to form a dilatation well soluble cavity communicated with the dilatation well and the communication channel.
7. A method of expanding a double well communication salt cavern gas storage according to any of claims 1 to 6 wherein the displacement medium is natural gas.
8. The method for expanding a double well communication salt cavern gas storage of any one of claims 1 to 6, wherein the salt dissolving medium is water.
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| US3552128A (en) * | 1969-06-02 | 1971-01-05 | Texaco Inc | Underground cavern for storage of hydrocarbons |
| CN109838279A (en) * | 2017-11-24 | 2019-06-04 | 江苏苏盐井神股份有限公司 | A method of salt cave storage cavern utilization rate is improved from bottom of chamber row's halogen using connected well |
| CN110096824A (en) * | 2019-05-08 | 2019-08-06 | 中国科学院武汉岩土力学研究所 | Salt cave storage tank farm method for estimating stability |
| CN110748380A (en) * | 2018-07-23 | 2020-02-04 | 中国石油天然气股份有限公司 | Method for building salt cavern gas storage |
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| US3552128A (en) * | 1969-06-02 | 1971-01-05 | Texaco Inc | Underground cavern for storage of hydrocarbons |
| CN109838279A (en) * | 2017-11-24 | 2019-06-04 | 江苏苏盐井神股份有限公司 | A method of salt cave storage cavern utilization rate is improved from bottom of chamber row's halogen using connected well |
| CN110748380A (en) * | 2018-07-23 | 2020-02-04 | 中国石油天然气股份有限公司 | Method for building salt cavern gas storage |
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