CN109681138B - Method for lifting and discharging halogen pipes - Google Patents
Method for lifting and discharging halogen pipes Download PDFInfo
- Publication number
- CN109681138B CN109681138B CN201710976200.4A CN201710976200A CN109681138B CN 109681138 B CN109681138 B CN 109681138B CN 201710976200 A CN201710976200 A CN 201710976200A CN 109681138 B CN109681138 B CN 109681138B
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- Prior art keywords
- pipe
- packer
- tubing
- halogen
- expansion type
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B29/00—Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
- E21B29/06—Cutting windows, e.g. directional window cutters for whipstock operations
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
- E21B23/06—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells for setting packers
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/127—Packers; Plugs with inflatable sleeve
Abstract
The invention discloses a method for pulling and discharging a brine pipe, and belongs to the technical field of salt cavern underground gas storage. The method comprises the following steps: a cutting device is put into the halogen discharging pipe, and the cutting device is used for cutting the halogen discharging pipe, so that the lower end face of the halogen discharging pipe is positioned in the first sleeve; setting a first tubing expansion type packer into the halogen discharging pipe until the first tubing expansion type packer penetrates out of the halogen discharging pipe and blocks the first sleeve; and lifting the halogen discharge pipe until the halogen discharge pipe is lifted out of the first sleeve. The method for pulling up the brine discharging pipe provided by the invention has the advantages that when the brine discharging pipe is lifted, only the brine discharging pipe in the oil pipe is lifted, the first oil passing pipe expansion type packer is not required to be driven to move upwards, high-pressure natural gas in the inner cavity of the salt cavern can be prevented from entering the upper part of the oil pipe, the abrasion of the first oil passing pipe expansion type packer is avoided, and the well control risk is reduced.
Description
Technical Field
The invention relates to the technical field of salt cavern underground gas storage, in particular to a method for removing a brine pipe.
Background
The salt cavern underground gas storage is a form of storing natural gas by utilizing a thicker salt layer or salt dune underground and manually manufacturing a cavern in the salt layer or salt dune to form a storage space. With the rapid development of social economy, the natural gas exploitation technology is continuously improved, so that the exploitation amount of the natural gas is continuously increased, and the market demand is better met. When the demand of the natural gas market is smaller than the exploitation amount of the natural gas, the excessive natural gas needs to be stored in order to avoid the waste of the natural gas. At present, salt cavern underground gas storage is generally built, and a method of injecting gas and discharging brine is utilized to store redundant natural gas. Wherein, gas injection and brine discharge means that natural gas is injected from an annular space between the oil pipe and the brine discharge pipe, and brine in the salt cavern is discharged from the brine discharge pipe. When the gas injection and the brine discharge are completed, the brine discharge pipe needs to be lifted out of the well bore. Because the inner cavity of the salt cavern is filled with high-pressure natural gas after the salt water is discharged, an effective method for discharging the brine pipe needs to be provided, otherwise, safety accidents can be caused.
The prior art provides a method for taking out and discharging a halogen tube, which comprises the following steps: firstly, throwing a blanking plug into an annular space between a first sleeve and a halogen discharge pipe through steel wire operation; then, a packer is put into the halogen discharging pipe, and the upper surface of the packer is filled with a plugging agent; then the halogen tube is lifted up until the halogen tube is lifted out of the first sleeve. When the brine discharge pipe is lifted upwards, the brine discharge pipe drives the plug to move upwards along the inner wall of the oil pipe, and the plug is always in sealing and abutting contact with the inner wall of the first sleeve pipe in the upward movement process. The blanking plug comprises a fixing piece and a sealing piece, the fixing piece is used for fixing the blanking plug on the inner wall of the first sleeve, the sealing piece is used for sealing an annular space between the first sleeve and the brine discharge pipe, high-pressure natural gas in the inner cavity of the salt cavern is prevented from flowing out of the annular space, and well control risks are avoided.
The inventor finds that the prior art has at least the following problems:
because the blanking plug has the risk that the fixing piece moves upwards and the sealing piece fails during the period of lifting the pipe string without killing the well, and the well control means is single during the period of killing the well, the risk that natural gas is blown over from the wellhead with the failure of the blanking plug exists, and the well control risk is increased.
Disclosure of Invention
In order to solve the above problems, embodiments of the present invention provide a method for taking up and discharging a halogen tube. The technical scheme is as follows:
a method of tripping a halogen tube, the method comprising:
a cutting device is put into the halogen discharging pipe, and the cutting device is used for cutting the halogen discharging pipe, so that the lower end face of the halogen discharging pipe is positioned in the first sleeve;
a first oil pipe expansion type packer is put into the halogen discharging pipe until the first oil pipe expansion type packer penetrates out of the halogen discharging pipe, and plugging is carried out in the first sleeve;
and lifting the halogen discharge pipe until the halogen discharge pipe is lifted out of the first sleeve.
Specifically, a blowout preventer is installed at the wellhead before the cutting device is lowered into the halogen discharge pipe.
Specifically, the cutting device is used for cutting the halogen discharging pipe in multiple sections until the lower end face of the halogen discharging pipe is positioned in the first sleeve.
Specifically, after the first tubing inflatable packer is used for plugging the first sleeve, the sealing performance of the first tubing inflatable packer is detected;
if the sealing performance of the first oil-passing pipe expansion type packer is poor, increasing the expansion force applied to the first oil-passing pipe expansion type packer or lowering a new first oil-passing pipe expansion type packer again;
and if the sealing performance of the first oil pipe expansion type packer is good, lifting the drainage pipe.
Specifically, the detecting the sealing performance of the first oil pipe expansion type packer comprises the following steps: injecting gas into the shaft or emptying the wellhead;
arranging a pressure gauge at the wellhead, and detecting the gas pressure at the wellhead;
judging the sealing performance of the first oil pipe expansion type packer according to the gas pressure value;
if the gas pressure value is kept unchanged or the increase amplitude is less than or equal to 5%, the sealing performance of the first oil-passing pipe expansion type packer is good; otherwise, the sealing performance of the first oil pipe expansion type packer is poor.
Specifically, before a first tubing inflatable packer is put into the drainage pipe, a second tubing inflatable packer is put into the drainage pipe until the second tubing inflatable packer penetrates out of the drainage pipe, and plugging is carried out in the second casing pipe.
Specifically, after the second oil pipe expansion type packer is used for plugging a casing, the sealing performance of the second oil pipe expansion type packer is detected;
if the sealing performance of the second oil-passing pipe expansion type packer is poor, increasing the expansion force applied to the second oil-passing pipe expansion type packer or lowering a new second oil-passing pipe expansion type packer again; and if the sealing performance of the second oil pipe expansion type packer is good, lifting the drainage pipe.
Specifically, the detecting the sealing performance of the second oil pipe expansion type packer comprises the following steps:
injecting gas into the wellbore or venting the wellhead;
detecting the gas pressure at the wellhead by using the pressure gauge;
judging the sealing performance of the second oil pipe expansion type packer according to the gas pressure value;
if the gas pressure value is kept unchanged or the increase amplitude is less than or equal to 5%, the sealing performance of the second oil-passing pipe expansion type packer is good; otherwise, the sealing performance of the second oil pipe expansion type packer is poor.
Specifically, the lifting-up halogen discharging pipe comprises:
discharging gas in a shaft until the pressure of the gas in the shaft is reduced to normal pressure;
and lifting the brine discharge pipe by using a workover rig.
Specifically, the first oil pipe expansion type packer and the second oil pipe expansion type packer are removable oil pipe expansion type packers.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
according to the method for pulling up and discharging the brine pipe, the brine pipe is cut firstly, so that the lower end face of the brine pipe is located in the sleeve, then the first oil pipe expansion type packer is lowered into the brine pipe, and the first oil pipe expansion type packer is used for plugging the first sleeve, so that when the brine pipe is lifted upwards, the brine pipe in the oil pipe is only required to be lifted upwards, the first oil pipe expansion type packer is not required to be driven to move upwards, high-pressure natural gas in the inner cavity of a salt cavern can be prevented from entering the upper part of the oil pipe, the abrasion of the first oil pipe expansion type packer is avoided, and well control risks are reduced; in addition, the method for pulling and discharging the halogen pipe provided by the embodiment of the invention has the advantages of simple construction, convenient operation and low operation cost.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in 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 invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic cross-sectional view of a first flow tube inflatable packer provided by the prior art;
FIG. 2 is a schematic representation of a first flow tube inflatable packer provided by the prior art;
FIG. 3 is a schematic illustration of a prior art configuration of the interior of a wellbore;
FIG. 4 is a schematic diagram of the configuration of the inside of a wellbore after completion of cutting of a halide removal pipe according to an embodiment of the present invention;
FIG. 5 is a schematic illustration of the internal structure of a wellbore after a first tubing inflatable packer and a second tubing inflatable packer have been run into the wellbore, in accordance with an embodiment of the present invention;
FIG. 6 is a schematic diagram of the structure inside the wellbore after completion of the raising and discharging of the brine pipe according to the embodiment of the present invention.
The various reference numbers in the drawings are explained below.
1-discharging a halogen pipe;
2-a first sleeve;
301-a first tubing inflatable packer;
3011-a mandrel;
3012-internal balloon;
3013-a tendon housing;
3014-a seal;
3015-end fittings;
302-a second flow tube inflatable packer;
4-a second sleeve;
5-a packer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The embodiment of the invention provides a method for taking out and discharging a halogen tube, which comprises the following steps:
step 101: and (3) putting a cutting device into the halogen discharging pipe 1, and cutting the halogen discharging pipe 1 by using the cutting device so that the lower end surface of the halogen discharging pipe 1 is positioned in the first sleeve 2.
Step 102: and (3) lowering the first oil pipe expansion type packer 301 into the halogen discharging pipe 1 until the first oil pipe expansion type packer 301 penetrates out of the halogen discharging pipe 1, and plugging in the first sleeve 2.
Step 103: the halogen tube 1 is lifted up until it emerges from the first casing 2.
It should be noted that the first through tubing inflatable packer 301 may be set in the first casing 2 to seal the first casing 2, and it should be avoided that setting is performed at the coupling of the first casing 2.
The through-tubing expandable packer is a device commonly used in the field, for example, refer to the text of the technical research and application status of the through-tubing packer published in journal of western prospecting engineering by liu you and the like.
Taking the first tubing inflatable packer 301 as an example, as shown in fig. 1, it mainly comprises: a mandrel 3011 provided with an injection hole, an inner balloon 3012, a rib housing 3013, a plurality of seals 3014, and two end fittings 3015; the inner balloon 3012 is sleeved on the outside of the mandrel 3011; the rib shell 3013 is sleeved outside the inner air bag 3012; referring to fig. 2, the sealing elements 3014 are sleeved outside the rib housing 3013 and are arranged at intervals along the axial direction of the mandrel 3011; end fittings 3015 are used to connect the mandrel 3011, the inner bladder 3012 and the tendon housing 3013 and seal the housing 3013 and the inner bladder 3012 at both ends.
After the first through-tubing inflatable packer 301 is connected to a setting tool (e.g., a coiled tubing setting tool), the setting tool injects an inflation fluid into the mandrel 3011, the inflation fluid enters the inner bladder 3012 through the injection hole on the mandrel 3011, and then the casing 3013 and the seal 3014 are inflated, i.e., an inflation force is applied to the casing 3013 and the seal 3014 until the casing and the seal are anchored and sealed to the inner wall of the first casing 2.
It should be noted that the relationship of the position of the brine discharge pipe 1, the first casing 2 and the second casing 4 and the depth of the well bore (referred to as "depth of penetration") can be seen in fig. 3. As can be seen from fig. 3, the halogen discharge pipe 1 is arranged in a first casing 2, and the first casing 2 is fixed in a second casing 4 by means of a packer 5.
In view of the working principle of the first tubing inflatable packer 301, the following describes a method for tripping a brine pipe according to an embodiment of the present invention:
based on the position relationship of the halogen discharging pipe 1, the first casing 2 and the second casing 4 and the characteristic that the first oil-through pipe expansion type packer 301 is stressed to expand, the embodiment of the invention firstly cuts the halogen discharging pipe 1, so that the lower end surface of the halogen discharging pipe 1 is positioned in the first casing 2 (see fig. 4). Then, the first oil tube expansion type packer 301 is lowered into the brine discharging pipe 1, when the first oil tube expansion type packer 301 penetrates out of the brine discharging pipe 1 and reaches the first casing pipe 2, the expansion liquid is injected into the first oil tube expansion type packer 301 until the first oil tube expansion type packer 301 is seated on the inner wall of the first casing pipe 2, the first casing pipe 2 is blocked, and high-pressure natural gas in the inner cavity of the salt cavern cannot penetrate through the first oil tube expansion type packer 301 and enter the upper portion of the first casing pipe 2. Finally, the halogen tube 1 is lifted upwards.
According to the method for removing the brine discharging pipe, provided by the embodiment of the invention, the brine discharging pipe 1 is firstly cut, so that the lower end surface of the brine discharging pipe 1 is positioned in the first sleeve 2, then the first oil passing pipe expansion type packer 301 is lowered into the brine discharging pipe 1, and the first oil passing pipe expansion type packer 301 blocks the first sleeve 2, so that when the brine discharging pipe 1 is lifted up, only the brine discharging pipe 1 in the first sleeve 2 is lifted up, the first oil passing pipe expansion type packer 301 is not required to be driven to move upwards, high-pressure natural gas in a salt cavity can be prevented from entering the upper part of the first sleeve 2, the first oil passing pipe expansion type packer 301 is prevented from being worn, and the well control risk is reduced; in addition, the method for pulling and discharging the halogen pipe provided by the embodiment of the invention has the advantages of simple construction, convenient operation and low operation cost.
The following describes the steps of the method for discharging a halogen tube by gas provided by the embodiment of the invention:
in step 101, a cutting device is put into the halogen discharging pipe 1, and the halogen discharging pipe 1 is cut by the cutting device, so that the lower end surface of the halogen discharging pipe 1 is positioned in the first sleeve 2.
In order to prevent the occurrence of blowout, a blowout preventer is installed at the wellhead before the cutting device is lowered into the bittern discharge pipe 1.
The mode of going into cutting device in arranging halogen pipe 1 has the multiple, for example utilizes the cable to go into cutting device down, can specifically be, carries out the electricity with the cable earlier and connects, then goes into the cable in arranging halogen pipe 1 through the pulley (mainly playing the effect of guide cable motion) that sets up in well head department, and then drives cutting device downstream.
In order to facilitate cutting of the brine discharge pipe 1, the cutting device in the embodiment of the invention can be an electric oil pipe cutter device. If the cable is fed into the cutting device, the cable transmits a processing signal to the cutting device when the cutting device reaches a preset cutting position, and the cutting device starts to cut the halogen discharge pipe 1 after receiving the processing signal.
It should be noted that the distance between the position to be reached by the cutting device and the lower end surface of the first casing 2 is such that at least 1 first through-tubing inflatable packer 301 can be set on the inner wall of the first casing 2.
When the bittern discharging pipe 1 is cut, the embodiment of the invention considers the factor of the size of the inner cavity of the salt cavern, and if the bittern discharging pipe 1 is cut too long at one time, the cut part of the bittern discharging pipe 1 can not lie on the bottom of the salt cavern due to the too large length, which causes inconvenience in work such as sonar test and the like in the later period.
In order to avoid the above situation, the embodiment of the present invention utilizes the cutting device to perform multi-stage cutting on the halogen discharging pipe 1 until the lower end surface of the halogen discharging pipe 1 is located in the first sleeve 2, for example, the cutting device may be first lowered to above the lower end surface of the halogen discharging pipe 1 and separated from the lower end surface of the halogen discharging pipe 1 by a first preset distance to perform first cutting; then, lifting the cutting device until the cutting device moves upwards for a second preset distance, and carrying out secondary cutting on the halogen discharging pipe 1; and then, by analogy, cutting the halogen discharge pipe 1 for multiple times until the lower end face of the halogen discharge pipe 1 is positioned in the first sleeve 2.
It should be noted that the part of the bittern discharge pipe 1 cut each time should not be too long, and it should be ensured that the part of the bittern discharge pipe 1 cut each time can fall to the bottom of the salt cavern, the first preset distance and the second preset distance can be set to 80m to 120m, and so on, so that the length of the bittern discharge pipe 1 to be cut each time can be set to 80m to 120 m.
When the cutting of the brine discharge pipe 1 is completed, the distance between the lower end surface of the brine discharge pipe 1 and the lower end surface of the first casing 2 should be measured (see fig. 4) to ensure that the first tubing inflatable packer 301 can be set on the inner wall of the first casing 2.
Step 102 is to lower a first tubing-string inflatable packer 301 into the drainage pipe 1 until the first tubing-string inflatable packer 301 penetrates out of the drainage pipe 1, and plug the first tubing-string inflatable packer 301 on the first casing 2.
Specifically, the first tubing-expandable packer 301 is lowered into the interior of the halogen discharging pipe 1, and the first tubing-expandable packer 301 is passed out of the halogen discharging pipe 1 until reaching a first preset position (see fig. 5); then, a swelling fluid is injected into the first tubing inflatable packer 301 to inflate the first tubing inflatable packer 301 until the first tubing inflatable packer 301 can set on the inner wall of the first casing 2 to block the first casing 2.
It is understood that a plurality of first flow tube inflatable packers 301 may be provided at the lower end of the first casing 2 in order to increase the effect of the first flow tube inflatable packer 301 blocking the first casing 2.
In the embodiment of the invention, a coiled tubing setting device or a cable setting tool is used for setting the first through tubing inflatable packer 301, and an expansion force is applied to the first through tubing inflatable packer 301, so that the first through tubing inflatable packer 301 is set on the inner wall of the first sleeve 2.
It should be noted that coiled tubing is a common device used by those skilled in the art, and the structure of coiled tubing will not be described here.
After the first oil pipe swelling type packer 301 is set on the inner wall of the first sleeve 2, in order to prevent the brine discharge pipe 1 from being lifted up, the sealing effect between the first oil pipe swelling type packer 301 and the inner wall of the first sleeve 2 is poor, and the high-pressure natural gas leaks from the inner cavity of the salt cavern, the sealing performance of the first oil pipe swelling type packer 301 needs to be detected.
Therefore, after the first tubing-conveyed inflatable packer 301 blocks the first casing 2, the sealing performance of the first tubing-conveyed inflatable packer 301 is detected; if the first flow tube inflatable packer 301 has poor sealing performance, increasing the external force applied to the first flow tube inflatable packer 301 or lowering a new first flow tube inflatable packer 301 again; if the first tubing inflatable packer 301 has good sealing performance, the brine pipe 1 is lifted up.
The sealability of the first flow tube inflatable packer 301 is mainly related to the externally applied inflation force, i.e., the amount of inflation fluid injected, and also to the size of the first flow tube inflatable packer 301. The specific reason is that if the expansion force applied to the first perforated pipe inflatable packer 301 is relatively small, the expansion force of the first perforated pipe inflatable packer 301 is insufficient, so that the first perforated pipe inflatable packer 301 cannot be closely abutted against the inner wall of the first casing 2; if the size of the first tubing inflatable packer 301 is too small, the seal 3014 is too large to be closely abutted against the inner wall of the first casing 2, which reduces the thickness of the seal 3014, reduces the pressure resistance of the seal 3014, and is easy to deform. Therefore, when it is detected that the first flow tube inflatable packer 301 is poor in sealing performance, the first flow tube inflatable packer 301 having a large size may be replaced and set on the inner wall of the first casing 2; or to increase the expansion force applied to the first pass tube inflatable packer 301.
Further, the method for detecting the sealing performance of the first through-tubing inflatable packer 301 provided by the embodiment of the invention comprises the following steps: injecting gas into the shaft or emptying the wellhead; a pressure gauge is arranged at the wellhead and used for detecting the gas pressure at the wellhead; judging the sealing performance of the first oil pipe expansion type packer 301 according to the gas pressure value; if the gas pressure value is kept unchanged or the increase amplitude is less than or equal to 5%, the sealing performance of the first oil-passing pipe expansion type packer 301 is good; otherwise, the first tubing inflatable packer 301 has poor sealability.
In order to avoid the situation that the first tubing-expandable packer 301 cannot be fixed and moved up in the well when in use, the embodiment of the present invention lowers the second tubing-expandable packer 302 into the casing 1 until the second tubing-expandable packer 302 exits the casing 1 and is plugged in the second casing 4 before lowering the first tubing-expandable packer 301 into the casing 1 (see fig. 5). Thus, the second tubing-passed inflatable packer 302 cannot move upwards continuously due to the existence of the 1 st casing, and the fixity of the packer can be ensured.
It should be noted that the second tubing inflatable packer 302 may be set in the second casing 4 to seal the second casing 4 and avoid setting at the collar of the second casing 4. In practice, to increase the effectiveness of the second flow tube inflatable packer 302 in plugging the second casing 4, a plurality of second flow tube inflatable packers 302 may be provided at the lower end of the second casing 4.
In the embodiment of the invention, a coiled tubing setting device or a cable setting tool is used for running the second through tubing inflatable packer 302, and an expansion force is applied to the second through tubing inflatable packer 302, so that the second through tubing inflatable packer 302 is set on the inner wall of the second sleeve 4.
Similarly, after the second flow tube inflatable packer 302 is set on the inner wall of the second casing 4, the tightness of the second flow tube inflatable packer 302 needs to be checked. Therefore, in the embodiment of the present invention, after the second tubing-conveyed inflatable packer 302 plugs the second casing 4, the sealing performance of the second tubing-conveyed inflatable packer 302 is detected; if the sealing performance of the second tubing string inflatable packer 302 is poor, increasing the external force applied to the second tubing string inflatable packer 302 or lowering a new second tubing string inflatable packer 302 again; if the sealing performance of the second tubing inflatable packer 302 is good, the halogen tube 1 is lifted up.
Further, the method for detecting the sealing performance of the second tubing inflatable packer 302 provided by the embodiment of the invention comprises the following steps: injecting gas into the well bore or venting the well head; detecting the gas pressure at the wellhead by using a pressure gauge; judging the tightness of the second tubing expansion type packer 302 according to the magnitude of the gas pressure value; if the gas pressure value is kept unchanged or the increase amplitude is less than or equal to 5%, the sealing performance of the second oil-passing pipe expansion type packer 302 is judged to be good; otherwise, the sealability of the second tubing inflatable packer 302 is judged to be poor.
When the poor sealing performance of the second tubing inflatable packer 302 is detected, the second tubing inflatable packer 302 with larger size can be replaced and set on the inner wall of the second casing 4; or increasing the expansion force applied to the second pass tubing inflatable packer 302.
It should be noted that, every time a tubing inflatable packer is set, the sealing performance of the set tubing inflatable packer should be tested. And the same pressure gauge is used for detecting the sealing performance of the first oil-passing pipe expansion type packer 301 and the second oil-passing pipe expansion type packer 302.
Step 103 is to lift the halogen tube 1 up until it emerges from the first sleeve 2.
The purpose of this step is to take out the whole bittern discharging pipe 1 from the well bore, and the method specifically comprises the following steps:
step 1031: and discharging the gas in the shaft until the pressure of the gas in the shaft is reduced to normal pressure.
In order to more conveniently and more laborsavingly lift the brine discharge pipe 1, the embodiment of the invention adopts a non-pressurized lifting mode to lift the brine discharge pipe 1, namely, gas in a shaft is discharged until the pressure of the gas in the shaft is normal pressure.
It should be noted that the gas in the well bore in the embodiment of the present invention includes natural gas and air in the halogen discharge pipe 1, and natural gas and air in the annular space between the halogen discharge pipe 1 and the first casing 2. Since the annular space between the first casing 2 and the second casing 4 is fitted with a packer 5, the medium of the wellbore in the present embodiment does not comprise the medium of the annular space between the first casing 2 and the second casing 4.
Natural gas and air in the halogen discharge pipe 1 and natural gas and air in an annular space between the halogen discharge pipe 1 and the first sleeve 2 can be pumped out and collected by utilizing a valve (such as a manual emptying valve of a filtering separator) on a ground process pipeline communicated with the Christmas tree; when the step is completed, a small amount of natural gas may still exist in the bittern discharge pipe 1, and the valve on the wellhead Christmas tree can be used for emptying the residual natural gas in the bittern discharge pipe 1.
Note that the atmospheric pressure in this step means one atmospheric pressure.
Step 1032: the brine discharge pipe 1 is lifted by the workover rig.
Wherein, the workover rig can be adopted to lift the brine discharge pipe 1, which is convenient for operation. After the halide removal pipe 1 has been lifted out of the first casing 2, the structure of the inside of the wellbore can be seen in fig. 6.
In order to recycle the first oil-passing pipe expansion packer 301 and the second oil-passing pipe expansion packer 302, the first oil-passing pipe expansion packer 301 and the second oil-passing pipe expansion packer 302 in the embodiment of the present invention are retrievable oil-passing pipe expansion packers. The oil pipe expansion type packer is unpacked when lifted.
After the lifting of the brine discharge pipe 1 is completed, the first oil pipe expansion type packer 301 and the second oil pipe expansion type packer 302 are fished out by using a bridge plug recovery device.
And then, dismantling the wellhead blowout preventer and auxiliary equipment, recovering underground and surface instruments, and recovering the wellhead and the well site.
All the above optional technical solutions may be combined arbitrarily to form the optional embodiments of the present disclosure, and are not described herein again.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A method of starting and discharging a halogen tube, the method comprising:
a cutting device is put into the halogen discharging pipe (1), and the cutting device is used for cutting the halogen discharging pipe (1) so that the lower end face of the halogen discharging pipe (1) is positioned in the first sleeve (2);
lowering a first tubing inflatable packer (301) into the drainage pipe (1) until the first tubing inflatable packer (301) penetrates out of the drainage pipe (1) and plugging is carried out in the first casing (2);
detecting the sealing performance of the first oil pipe expansion type packer (301);
if the first tubing inflatable packer (301) has poor sealing performance, increasing the expansion force applied to the first tubing inflatable packer (301) or re-setting a new first tubing inflatable packer (301);
if the first oil pipe expansion type packer (301) has good sealing performance, the halogen discharging pipe (1) is lifted up until the first oil pipe expansion type packer is lifted out of the first casing pipe (2).
2. A method according to claim 1, characterized in that a blowout preventer is installed at the wellhead before lowering the cutting device into the pipe (1).
3. The method according to claim 1, characterized in that the pipe (1) is cut in sections with the cutting device until the lower end surface of the pipe (1) is located inside the first casing (2).
4. The method of claim 1, wherein said detecting the leak-tightness of the first pass tube inflatable packer (301) comprises: injecting gas into the shaft or emptying the wellhead;
arranging a pressure gauge at the wellhead, and detecting the gas pressure at the wellhead;
judging the sealing performance of the first oil pipe expansion type packer (301) according to the magnitude of the gas pressure value;
if the gas pressure value is kept unchanged or the increase amplitude is less than or equal to 5%, the sealing performance of the first oil-passing pipe expansion type packer (301) is good; otherwise, the first oil pipe expansion type packer (301) is poor in sealing performance.
5. A method according to claim 4, characterized in that before lowering the first tubing inflatable packer (301) into the firing line (1), a second tubing inflatable packer (302) is lowered into the firing line (1) until the second tubing inflatable packer (302) exits the firing line (1) and is plugged in a second casing (4).
6. The method according to claim 5, characterized in that after plugging the second tubing inflatable packer (302) with the second casing (4), the tightness of the second tubing inflatable packer (302) is checked;
if the second tubing-expanded packer (302) has poor sealing performance, increasing the expansion force applied to the second tubing-expanded packer (302) or re-setting a new second tubing-expanded packer (302); and if the sealing performance of the second oil pipe expansion type packer (302) is good, lifting the drainage pipe (1).
7. The method of claim 6, wherein the detecting the seal of the second pass tubing inflatable packer (302) comprises:
injecting gas into the wellbore or venting the wellhead;
detecting the gas pressure at the wellhead by using the pressure gauge;
judging the tightness of the second oil pipe expansion type packer (302) according to the magnitude of the gas pressure value;
if the gas pressure value is kept unchanged or the increase amplitude is less than or equal to 5%, the sealing performance of the second oil-passing pipe expansion type packer (302) is good; otherwise, the second tubing-expanded packer (302) has poor sealing performance.
8. The method according to claim 1, wherein said lifting up said halide removal pipe (1) comprises:
discharging gas in a shaft until the pressure of the gas in the shaft is reduced to normal pressure;
and (3) lifting the brine discharge pipe (1) by using a workover rig.
9. The method according to claim 5, wherein the first and second flow-through tubing inflatable packers (301, 302) are both retrievable flow-through tubing inflatable packers.
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| CN201710976200.4A CN109681138B (en) | 2017-10-19 | 2017-10-19 | Method for lifting and discharging halogen pipes |
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| CN109681138B true CN109681138B (en) | 2021-04-30 |
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| CN114607938B (en) * | 2022-03-03 | 2023-05-02 | 中盐金坛盐化有限责任公司 | Salt cavern hydrogen storage gas production pipe sealing process |
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