CN112282718B - Combined pipe string for sidetracking well and slim hole well and use method - Google Patents
Combined pipe string for sidetracking well and slim hole well and use method Download PDFInfo
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- CN112282718B CN112282718B CN202011224387.0A CN202011224387A CN112282718B CN 112282718 B CN112282718 B CN 112282718B CN 202011224387 A CN202011224387 A CN 202011224387A CN 112282718 B CN112282718 B CN 112282718B
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000004519 manufacturing process Methods 0.000 claims abstract description 45
- 239000004576 sand Substances 0.000 claims abstract description 15
- 239000012530 fluid Substances 0.000 claims description 12
- 238000005488 sandblasting Methods 0.000 claims description 11
- 238000005553 drilling Methods 0.000 claims description 8
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 5
- 239000010962 carbon steel Substances 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000002407 reforming Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims 1
- 230000009466 transformation Effects 0.000 abstract description 12
- 230000006378 damage Effects 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 5
- 208000027418 Wounds and injury Diseases 0.000 abstract description 2
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- 208000014674 injury Diseases 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 12
- 239000007788 liquid Substances 0.000 description 10
- 238000011161 development Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- 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
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/04—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells operated by fluid means, e.g. actuated by explosion
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- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/122—Multiple string packers
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- 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
- E21B43/11—Perforators; Permeators
- E21B43/114—Perforators using direct fluid action on the wall to be perforated, e.g. abrasive jets
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Abstract
The invention provides a combined pipe string for a sidetracking well and a small borehole well and a using method thereof, wherein the pipe string comprises a continuous oil pipe, an adapter, a small-diameter pipe, a hydraulic safety joint, a hydraulic sand blower, a balance valve, a hydraulic anchor, a lower packer and a guide head, wherein the continuous oil pipe is positioned in an upper sleeve, the lower part in the upper sleeve is provided with a hanging packer, and the lower end of the hanging packer is connected with a lower sleeve; the coiled tubing pass through crossover sub and small diameter union coupling, small diameter pipe be located the lower casing intraductal, small diameter pipe lower extreme connect gradually hydraulic pressure safety joint, hydraulic sand blaster, balanced valve, hydraulic anchor, lower packer and direction head. The combined pipe string provided by the invention effectively realizes 3 1 / 2 "the staged fracturing of sleeve pipe stratum, as fracturing tubular column use have safe and reliable, the transformation scale is big, the unrestricted advantage of transformation segment number, as the production tubular column use have the full life-span drainage gas production effectual, with low costs, it is little to the reservoir injury.
Description
Technical Field
The invention relates to the technical field of underground operation of oil field exploration and development, in particular to a combined pipe string for a sidetrack well and a slim hole well and a using method thereof, which are suitable for staged fracturing modification and well completion production of reservoirs of a gas field sidetrack well and similar gas field slim hole wells.
Background
In the face of the current situation of yield and benefit, it is important to develop a low-cost development strategy. Considering the factors of reducing drilling, fracturing and production investment comprehensively, for newly developed wells, the conventional 6' -well bore +5 is considered 1 / 2 "casing is gradually towards 5" borehole +4 1 / 2 "casing and 4" wellbore +3 1 / 2 "progressive casing transition, in particular 4" wellbore +3 1 / 2 "casing" is the lowest way of gas well completion cost at present, receives the more and more favor of low-cost strategy. In consideration of land acquisition cost, surface equipment cost and other factors, sidetracking of new boreholes in old well sections has become increasingly important as an effective process technology. Limited by the original 6 ' well bore of the old well, only 4 ' bit sidetrack can be developed at present, and the lower 3 ' bit can be used 1 / 2 Production of cased hole completions. For reservoirs with more strata, whether a slim-hole new well or an old well lateral well is developed 3 1 / 2 "casing staged fracturing and production are of great significance to cost reduction and efficiency improvement development, and at present, the technology is in a preliminary development stage, and the matching technology is not mature.
The process for hydraulic sand blasting perforation, packer layering and annulus fracturing of the continuous oil pipe has the advantages of simple process, high packing effectiveness, high construction speed (5% 1 / 2 The sleeve is widely applied. Is generally in the range of 5 1 / 2 The size of coiled tubing capable of being put into the casing is
The large-size coiled tubing body has high yield strength and length of more than 6000m, and meets the requirement of fracturing of a horizontal well with a long horizontal section. But 3 1 / 2 "the casing can be put into the hole at the maximum
The yield strength of the coiled tubing body with the size is only 232KN through a look-up tableThe length of the current product is about 4500m, so 3 1 / 2 The method has the advantages that hydraulic sand blasting perforation, packer layering and annular fracturing process reconstruction risks of the coiled tubing in the casing are large, reconstruction scale is limited, the method is only suitable for a vertical well or a directional well, and a new process method needs to be explored for a horizontal well, particularly a long horizontal section horizontal well; on the other hand, 3 1 / 2 After the cased well is transformed, coiled tubing can be pressed under pressure to be used as a speed tubular column for production, but the price of the coiled tubing is high, the cost of a single well is generally over 45 ten thousand yuan, and the concept of low-cost development is violated. The patent 'a small diameter water drainage gas production string' (patent number: CN 104632091A) proposes to replace a coiled tubing by a small diameter seamless pipe, the cost of the small diameter pipe with the same diameter is only 40-50% of that of the coiled tubing, but the small diameter pipe needs to be put into a casing in a single joint connection mode, well killing operation needs to be carried out firstly before entering a well, the influence on the productivity of a stratum is large, and even early flooding and production stop of a low-production low-efficiency gas well are caused.
Disclosure of Invention
In order to overcome the problems of difficult reconstruction, stratum damage caused by reconstruction and high cost in the prior art, the invention provides a combined pipe string for a sidetrack well and a small borehole well and a use method thereof, the invention uses a coiled tubing and a small-diameter pipe combined pipe string with the same pipe diameter to replace a single coiled tubing pipe string to carry out hydraulic sand blasting perforation, packer layering and annular fracturing processes on stratum reconstruction, can overcome the difficulties of insufficient yield strength, insufficient length and the like of the coiled tubing, and can realize 3 1 / 2 The staged fracturing of the casing is safe and reliable, the number of the reconstruction sections is not limited, and the method is suitable for sidetracking and conventional slim-hole wells.
The technical scheme adopted by the invention is as follows:
a combined pipe string for a sidetracking well and a small borehole well comprises a continuous oil pipe, a crossover sub, a small-diameter pipe, a hydraulic safety joint, a hydraulic sand blaster, a balance valve, a hydraulic anchor, a lower packer and a guide head, wherein the continuous oil pipe is positioned in an upper sleeve, the lower part in the upper sleeve is provided with a suspended packer, and the lower end of the suspended packer is connected with a lower sleeve; the coiled tubing pass through crossover sub and small diameter union coupling, small diameter pipe be located the lower casing intraductal, small diameter pipe lower extreme connect gradually hydraulic pressure safety joint, hydraulic sand blaster, balanced valve, hydraulic anchor, lower packer and direction head.
The lower casing include vertical section, turning section and slope section, the turning section be the circular arc, small diameter pipe lower extreme pass and hang the packer and indicate the turning section along the direction downwardly extending of lower casing, hydraulic pressure safety joint, hydraulic sand blaster, balanced valve, hydraulic anchor, lower packer and the direction head that small diameter pipe lower extreme is connected are located the slope section of lower casing.
The small-diameter pipe is made of 45# carbon steel.
The inner diameters of the coiled tubing and the small-diameter tubing are the same, and both are
The displacement of the balance valve is less than or equal to 0.05m 3 At the time of min, the valve is in an open state, and when the discharge capacity is more than 0.10m 3 And at the time of/min, the balance valve is automatically closed.
The setting pressure of the hydraulic anchor and the lower packer is 0.5-1.5 Mpa.
The upper sleeve is 5 1 / 2 "sleeve pipe, lower sleeve pipe is 3 1 / 2 A "sleeve.
The lower packer is a K344 packer.
A use method of a combined pipe string for a sidetrack well and a slim hole well comprises the following specific steps:
firstly, completing well opening and flushing operation according to requirements, determining the length of a small-diameter pipe according to requirements, and lowering a combined pipe string for side drilling and small-hole well into a casing pipe through staged fracturing and production;
secondly, after the combined pipe string is put in place, reforming a first section of reservoir, injecting perforating fluid from the combined pipe string, and performing hydraulic sand blasting perforation; after perforation is finished, injecting fracturing fluid from the oil sleeve annulus, and simultaneously keeping the combined pipe string in tracing injection; repeating the steps, and dragging the fracturing drilling tool by the combined pipe string to sequentially complete the reconstruction of other reservoirs;
thirdly, after fracturing, open flow is carried out; after blowout is finished, lowering the fracturing string to the position of the artificial well bottom, throwing a soluble ball from the well mouth, and after the soluble ball falls to the hydraulic safety joint, performing segmented fracturing on the combined string and pressurizing the production string for the sidetracking well and the slim hole well to realize releasing of the hydraulic safety joint, and stringing tools below the hydraulic safety joint to the artificial well bottom;
and fourthly, lifting the combined pipe string, pulling out the coiled tubing and the adapter, and hanging the small-diameter pipe on a wellhead device to be used as a speed pipe string for producing the gas well.
The invention has the beneficial effects that:
firstly, the hydraulic sand blasting perforation, packer layering and annular fracturing processes are implemented on stratum reconstruction by replacing a single coiled tubing string with the coiled tubing and the small-diameter tube combined tube string with the same diameter, the difficulties of insufficient yield strength, insufficient length and the like of the coiled tubing can be overcome, the segmented fracturing of a 31/2' casing can be realized, the number of reconstruction segments is not limited, and the method is suitable for sidetracking and conventional slim-hole wells.
Secondly, annular segmented fracturing is carried out by using a small-pipe-diameter coiled tubing and a small-diameter pipe combined pipe string with the same pipe diameter, the friction of liquid is small, and the discharge capacity can reach 3m 3 More than min, large scale of modification.
And thirdly, after the transformation is finished, suspending the small-diameter pipe on a wellhead device to be used as a speed pipe column for production, so that the critical liquid carrying flow rate of the gas well can be reduced in the whole life cycle from production to abandonment, and the gas flow rate in the shaft is increased, thereby improving the liquid carrying capacity of the gas well, ensuring the stable production of the gas well and prolonging the production period of the gas well.
Fourthly, after the transformation is finished, the small-diameter pipe of the fracturing pipe column is directly used as a production pipe column, and compared with a production pipe column which is arranged after the well killing, the production pipe column can be used for one time, the operation period is shortened, the cost for pulling out the pipe column is reduced, and the damage of the well killing fluid to the reservoir is avoided.
Fifthly, a small-diameter pipe made of 45# carbon steel is used for replacing a coiled tubing with the same size to be used as a velocity string for production, and the cost can be saved by 40-50%.
The following will be further described with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
In the figures, the reference numbers are: 1. mounting a sleeve; 2. a coiled tubing; 3. a crossover sub; 4. a small diameter tube; 5. a hydraulic safety joint; 6. a hydraulic sand blower; 7. a balancing valve; 8. a hydraulic anchor; 9. a lower packer; 10. a guide head; 11. hanging a packer; 12. and (5) casing pipe descending.
Detailed Description
Example 1:
in order to overcome the problems of difficult reconstruction, stratum damage caused by reconstruction and high cost in the prior art, the invention provides the combined pipe string for the sidetracking well and the small borehole well and the use method thereof as shown in figure 1, the invention replaces the single continuous oil pipe string with the combined pipe string of the continuous oil pipe and the small-diameter pipe with the same pipe diameter to carry out hydraulic sand blasting perforation, packer layering and annular fracturing processes on the stratum reconstruction, can overcome the difficulties of insufficient yield strength, insufficient length and the like of the continuous oil pipe, and can realize 3 1 / 2 The staged fracturing of the casing is safe and reliable, the number of the reconstruction sections is not limited, and the casing is suitable for sidetracking and conventional slim-hole wells.
A combination pipe string for a sidetracking well and a small borehole well comprises a continuous oil pipe 2, an adapter 3, a small-diameter pipe 4, a hydraulic safety joint 5, a hydraulic sand blaster 6, a balance valve 7, a hydraulic anchor 8, a lower packer 9 and a guide head 10, wherein the continuous oil pipe 2 is positioned in an upper casing 1, a hanging packer 11 is arranged at the inner lower part of the upper casing 1, and the lower end of the hanging packer 11 is connected with a lower casing 12; the continuous oil pipe 2 is connected with a small-diameter pipe 4 through a conversion joint 3, the small-diameter pipe 4 is positioned in a lower casing 12, and the lower end of the small-diameter pipe 4 is sequentially connected with a hydraulic safety joint 5, a hydraulic sand blaster 6, a balance valve 7, a hydraulic anchor 8, a lower packer 9 and a guide head 10.
The combined pipe string of the small-caliber continuous oil pipe 2 and the small-caliber pipe 4 with the same diameter is adopted for annular segmented fracturing, the liquid friction resistance is small, and the discharge capacity can reach 3m 3 More than min, large scale of transformation. After the transformation is finished, the small-diameter pipe 2 is directly used as a production pipe column, compared with a production pipe column which is put in a well after killing, the production pipe column can be produced in one less time, the operation period is shortened, the cost for pulling out and putting down the pipe column is reduced, and the damage of the killing fluid to a reservoir stratum is avoided. After the transformation is finished, the small-diameter pipe 4 is hung on a wellhead device to be used as a speed pipe column for production, so that the critical liquid carrying flow rate of the gas well can be reduced in the whole life cycle from production to abandonment, the gas flow rate in the shaft is increased, the liquid holding capacity of the gas well is improved, the stable production of the gas well is ensured, and the production period of the gas well is prolonged.
The working process of the invention is as follows:
completing the well-through and well-flushing operation as required, determining the length of the small-diameter pipe 4 required by well completion production according to the well logging information and the well body structure, and descending the small-diameter pipe into the casing according to the connection sequence of the structure shown in the attached figure 1. The pipe column (combined pipe string) is lowered to a hydraulic sand blower 6 to be aligned with the first section of reservoir stratum, perforating fluid is injected from the continuous oil pipe and the small-diameter pipe combined pipe string, and hydraulic sand blasting perforation is carried out. And after the perforation is finished, injecting fracturing fluid from the annular space of the oil sleeve, and simultaneously keeping the low-displacement accompanying injection of the combined pipe string. And repeating the steps, and dragging the fracturing drilling tool by the combined pipe string to complete the reconstruction of other reservoirs in sequence. After fracturing is finished, open-flow is carried out; after blowout, the fracturing string is lowered to the position of the artificial well bottom, the soluble ball is thrown from the well mouth, the combined string is pressurized after the soluble ball falls to the hydraulic safety joint 5, the hydraulic safety joint 5 is released, and the tool string below the hydraulic safety joint 5 falls to the artificial well bottom. And lifting the combined pipe string, pulling out the coiled tubing 2 and the adapter 3, and hanging the small-diameter pipe 4 on a wellhead device to be used as a speed pipe string for gas well production.
The reagent liquid involved in the present invention is the prior art, and will not be further described in the present invention. The invention replaces the single coiled tubing string with the coiled tubing string of 2 and 4 combined strings of small diameter tubes with the same diameter to carry out the hydraulic sand blasting perforation, packer layering and annular fracturing processes on the stratum reconstruction, can overcome the difficulties of insufficient yield strength, insufficient length and the like of the coiled tubing, and can realize 3 1 / 2 "staged fracturing of sleeve pipe is safe and reliable, and the number of segments of transformation is not influencedAnd the method is limited and is suitable for sidetracking and conventional slim hole wells.
Example 2:
based on the embodiment 1, in this embodiment, preferably, the lower casing 12 includes a vertical section, a corner section, and an inclined section, the corner section is a circular arc, the lower end of the small-diameter pipe 4 passes through the suspended packer 11 and extends downward along the direction of the lower casing 12 to indicate the corner section, the hydraulic safety joint 5 connected to the lower end of the small-diameter pipe 4, the hydraulic sand blower 6, the balance valve 7, the hydraulic anchor 8, the lower packer 9, and the guide head 10 are located in the inclined section of the lower casing 12.
Preferably, the small-diameter pipe 4 is made of 45# carbon steel.
Preferably, the inner diameters of the continuous oil pipe 2 and the small-diameter pipe 4 are the same, and both the inner diameters are the same
Preferably, the balance valve 7 has a displacement less than or equal to 0.05m 3 At min, the valve is in an open state, and when the displacement is more than 0.10m 3 At/min, the balance valve is automatically closed.
The balance valve 7 in the invention has the discharge capacity of less than or equal to 0.05m 3 The packer is in an open state during min, so that the hydraulic anchor 8 and the K344 packer are prevented from being midway set due to the throttling action of the hydraulic sand blaster 6 in the lowering process of the pipe column; when the discharge capacity is more than 0.10m 3 And at the time of/min, the balance valve is automatically closed, so that the fluid can be sprayed out from the hydraulic sand blaster 6 only when the perforation and the fracturing are carried out.
Preferably, the setting pressure of the hydraulic anchor 8 and the lower packer 9 is 0.5-1.5 Mpa.
Preferably, the upper sleeve 1 is 5 1 / 2 "Sleeve, lower sleeve 12 is 3 1 / 2 A sleeve.
Preferably, the lower packer 9 is a K344 packer.
A use method of a combined pipe string for a sidetrack well and a slim hole well comprises the following specific steps:
firstly, completing the well-through and well-flushing operation according to requirements, determining the length of the small-diameter pipe 4 according to requirements, and lowering the combined pipe string for the sidetracking well and the small-bore well into a casing pipe through staged fracturing and production;
secondly, after the combined pipe string is put in place, reforming a first section of reservoir, injecting perforating fluid from the combined pipe string, and performing hydraulic sand blasting perforation; after the perforation is finished, injecting fracturing fluid from the oil sleeve annulus, and simultaneously keeping the combined pipe string in tracing injection; repeating the steps, and dragging the fracturing drilling tool by the combined pipe string to sequentially complete the reconstruction of other reservoirs;
thirdly, after fracturing, open flow is carried out; after blowout is finished, lowering the fracturing string to the position of the artificial well bottom, throwing the soluble ball from the well mouth, and after the soluble ball falls to the hydraulic safety joint 5, performing segmented fracturing and production string pressurization on the combined string for the sidetracking well and the slim well, so as to realize releasing of the hydraulic safety joint 5 and make the tool below the hydraulic safety joint 5 fall to the artificial well bottom;
and fourthly, lifting the combined pipe string, pulling out the coiled tubing 2 and the adapter 3, and suspending the small-diameter pipe 4 on a wellhead device to be used as a speed pipe string for gas well production.
The invention replaces the single coiled tubing string with the coiled tubing string of 2 and 4 combined strings of small diameter tubes with the same diameter to carry out the hydraulic sand blasting perforation, packer layering and annular fracturing processes on the stratum reconstruction, can overcome the difficulties of insufficient yield strength, insufficient length and the like of the coiled tubing, and can realize 3 1 / 2 The staged fracturing of the casing is safe and reliable, the number of the reconstruction sections is not limited, and the method is suitable for sidetracking and conventional slim-hole wells.
The combined pipe string of the small-caliber continuous oil pipe 2 and the small-caliber pipe 4 with the same diameter is adopted for annular segmented fracturing, the liquid friction resistance is small, and the discharge capacity can reach 3m 3 More than min, large scale of modification.
After the transformation is finished, the small-diameter pipe 4 is hung on a wellhead device to be used as a speed pipe column for production, so that the critical liquid carrying flow rate of the gas well can be reduced in the whole life cycle from production to abandonment, the gas flow rate in the shaft is increased, the liquid holding capacity of the gas well is improved, the stable production of the gas well is ensured, and the production period of the gas well is prolonged.
After the transformation is finished, the small-diameter pipe 2 is directly used as a production pipe column, compared with a production pipe column which is put in a well after killing, the production pipe column can be produced in one less time, the operation period is shortened, the cost for pulling out and putting down the pipe column is reduced, and the damage of the killing fluid to a reservoir stratum is avoided.
According to the invention, the small-diameter pipe 4 made of 45# carbon steel is adopted to replace the coiled tubing 2 with the same size to be used as a velocity string for production, so that the cost can be saved by 40-50%.
The invention effectively realizes the connection of the coiled tubing 2 and the small-diameter tube 4 with the same diameter by the combination tube string 3 1 / 2 "the staged fracturing of sleeve pipe stratum, as fracturing tubular column use have safe and reliable, the transformation scale is big, the unrestricted advantage of transformation segment number, as the production tubular column use have the full life-span drainage gas production effectual, with low costs, it is little to the reservoir injury.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention, and all designs identical or similar to the present invention are within the scope of the present invention. The apparatus structure and the method steps thereof, which are not described in detail in the present invention, are prior art and will not be further described in the present invention.
Claims (7)
1. A use method of a combined pipe string for a sidetrack well and a slim hole well is characterized in that: the method comprises the following specific steps:
firstly, completing well opening and washing operation according to requirements, determining the length of a small-diameter pipe (4) in a combined pipe string for the side drilling well and the slim hole well according to requirements, and performing staged fracturing and production pipe string on the combined pipe string for the side drilling well and the slim hole well to the inside of a casing pipe;
secondly, after the combined pipe string is put in place, reforming a first section of reservoir, injecting perforating fluid from the combined pipe string, and performing hydraulic sand blasting perforation; after perforation is finished, injecting fracturing fluid from the oil sleeve annulus, and simultaneously keeping the combined pipe string in tracing injection; repeating the steps, and dragging the fracturing drilling tool by the combined pipe string to complete the reformation of other reservoirs in sequence;
thirdly, after fracturing, open flow is carried out; after blowout is finished, lowering the fracturing string to the position of the artificial well bottom, throwing a soluble ball from the well mouth, and after the soluble ball falls to the hydraulic safety joint (5), performing segmented fracturing on the combined string for the sidetracking well and the slim well and pressurizing the production string to realize releasing of the hydraulic safety joint (5), wherein a tool string below the hydraulic safety joint (5) falls to the artificial well bottom;
fourthly, lifting the combined pipe string column, pulling out the coiled tubing (2) and the adapter (3), and suspending the small-diameter pipe (4) on a wellhead device to be used as a speed pipe column for gas well production;
the combined pipe string for the sidetracking well and the small borehole well comprises a continuous oil pipe (2), a crossover sub (3), a small-diameter pipe (4), a hydraulic safety joint (5), a hydraulic sand blower (6), a balance valve (7), a hydraulic anchor (8), a lower packer (9) and a guide head (10), wherein the continuous oil pipe (2) is positioned in an upper casing (1), a hanging packer (11) is arranged at the inner lower part of the upper casing (1), and the lower end of the hanging packer (11) is connected with a lower casing (12); the continuous oil pipe (2) is connected with a small-diameter pipe (4) through a crossover sub (3), the small-diameter pipe (4) is positioned in a lower casing (12), and the lower end of the small-diameter pipe (4) is sequentially connected with a hydraulic safety joint (5), a hydraulic sand blaster (6), a balance valve (7), a hydraulic anchor (8), a lower packer (9) and a guide head (10); the small-diameter pipe (4) is made of No. 45 carbon steel; the inner diameters of the coiled tubing (2) and the small-diameter tube (4) are consistent; lower casing (12) including vertical section, corner section and slope section, the corner section be the circular arc, minor diameter pipe (4) lower extreme pass and hang packer (11) and along the direction downwardly extending to corner section of lower casing (12), hydraulic pressure safety joint (5), water conservancy sand blower (6), balanced valve (7), hydraulic anchor (8), lower packer (9) and direction head (10) that minor diameter pipe (4) lower extreme connected gradually are located the slope section of lower casing (12).
2. The method of using a lateral and slim hole well combination string of claim 1, wherein: the coiled tubing (2) and the small-diameter tube (4) combined tube string with the same diameter are subjected to annular segmented fracturing, and the discharge capacity of the combined tube string reaches 3m 3 More than min.
3. The method of using a lateral and slim hole well combination string of claim 1, wherein: the inner diameters of the coiled tubing (2) and the small-diameter tube (4) are both
4. The method of using a lateral and slim hole well combination string of claim 1, wherein: the displacement of the balance valve (7) is less than or equal to 0.05m 3 At min, the valve is in an open state, and when the displacement is more than 0.10m 3 At/min, the balance valve (7) is automatically closed.
5. The method of using a lateral and slim hole well combination string of claim 1, wherein: the setting pressure of the hydraulic anchor (8) and the lower packer (9) is 0.5-1.5 Mpa.
6. The method of using a lateral and slim hole well combination string of claim 1, wherein: the upper sleeve (1) is 5 1 / 2 "sleeve pipe", lower sleeve pipe (12) is 3 1 / 2 A "sleeve.
7. The method of using a lateral and slim hole well combination string of claim 1, wherein: the lower packer (9) is a K344 packer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011224387.0A CN112282718B (en) | 2020-11-05 | 2020-11-05 | Combined pipe string for sidetracking well and slim hole well and use method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011224387.0A CN112282718B (en) | 2020-11-05 | 2020-11-05 | Combined pipe string for sidetracking well and slim hole well and use method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112282718A CN112282718A (en) | 2021-01-29 |
| CN112282718B true CN112282718B (en) | 2022-12-02 |
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| CN202011224387.0A Active CN112282718B (en) | 2020-11-05 | 2020-11-05 | Combined pipe string for sidetracking well and slim hole well and use method |
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| CN115045635A (en) * | 2022-06-07 | 2022-09-13 | 西南石油大学 | Tool and method suitable for downhole pressurized well completion of gas and liquid drilling |
| CN115324538B (en) * | 2022-08-09 | 2023-06-06 | 西南石油大学 | Perforating string dynamics system and analysis method for oil and gas exploration |
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| US7096954B2 (en) * | 2001-12-31 | 2006-08-29 | Schlumberger Technology Corporation | Method and apparatus for placement of multiple fractures in open hole wells |
| CN102562017A (en) * | 2010-12-29 | 2012-07-11 | 安东石油技术（集团）有限公司 | Sand blasting, perforating and fracturing method |
| JP5523373B2 (en) * | 2011-02-18 | 2014-06-18 | 三菱マテリアル株式会社 | Hollow steel rod for excavation and manufacturing method thereof |
| CN102777156A (en) * | 2012-07-20 | 2012-11-14 | 中国石油化工股份有限公司 | Fracturing method for multi-interval oil and gas wells |
| CN203321476U (en) * | 2013-06-05 | 2013-12-04 | 中国石油天然气股份有限公司 | Coiled tubing controllable packer technique pipe for repeated reconstruction of old wells |
| CN104632091B (en) * | 2013-11-15 | 2017-07-14 | 中国石油天然气股份有限公司 | A kind of minor diameter water pumping gas production tubing string |
| CN104695927B (en) * | 2015-01-27 | 2017-07-07 | 中国石油天然气股份有限公司 | A kind of coiled tubing and production tube compound tube string pressure break and completion integral method |
| CN204782945U (en) * | 2015-07-06 | 2015-11-18 | 中国石油化工股份有限公司 | Double -barrelled oil production pipe of sleeve pipe absorption well |
| CN108194071A (en) * | 2017-12-18 | 2018-06-22 | 中国石油天然气股份有限公司 | A kind of 3 cun of half side tracked slim hole fracturing strings |
| US11125026B2 (en) * | 2018-10-24 | 2021-09-21 | Saudi Arabian Oil Company | Completing slim-hole horizontal wellbores |
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