CN113586024A - Method for temporarily blocking fractured reservoir by using soluble polymer biological knots - Google Patents
Method for temporarily blocking fractured reservoir by using soluble polymer biological knots Download PDFInfo
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- CN113586024A CN113586024A CN202110882792.XA CN202110882792A CN113586024A CN 113586024 A CN113586024 A CN 113586024A CN 202110882792 A CN202110882792 A CN 202110882792A CN 113586024 A CN113586024 A CN 113586024A
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- 229920000642 polymer Polymers 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000000903 blocking effect Effects 0.000 title abstract description 20
- 230000008569 process Effects 0.000 claims abstract description 9
- 230000000694 effects Effects 0.000 claims abstract description 6
- 238000010276 construction Methods 0.000 claims description 46
- 239000007788 liquid Substances 0.000 claims description 9
- 238000005086 pumping Methods 0.000 claims description 9
- 238000005728 strengthening Methods 0.000 claims description 8
- 230000000887 hydrating effect Effects 0.000 claims description 3
- 230000015556 catabolic process Effects 0.000 abstract description 5
- 238000006731 degradation reaction Methods 0.000 abstract description 5
- 238000007789 sealing Methods 0.000 abstract description 5
- 238000005056 compaction Methods 0.000 abstract description 3
- 238000004090 dissolution Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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Classifications
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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
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
-
- 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
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Biological Depolymerization Polymers (AREA)
Abstract
The invention discloses a method for temporarily blocking and fracturing a reservoir stratum by using soluble polymer biological knots, wherein in the staged fracturing process, after each stage finishes perforation, the soluble polymer biological knots are pumped to block and fracture the perforation; the invention adopts the rope knot type structure of the soluble polymer biological knots, enters the fracturing eyelet from the wings at the two ends of the rope knot type structure, utilizes the characteristics of light density, complete degradation, no pollution, large bearing capacity, high temperature resistance and good mechanical property of the biological knots, ensures that the fracturing eyelet cannot fall off after compaction and temporary plugging, has good eyelet sealing effect and low cost, is not limited by the drift diameter in a shaft after being put into the rope knot type structure, and is convenient to achieve the purpose of layering.
Description
Technical Field
The invention belongs to the technical field of methods or equipment for extracting oil, gas, water, soluble or meltable substances or mineral mud from a well, and particularly relates to a method for temporarily blocking and fracturing a reservoir stratum by using a soluble polymer biological knot.
Background
The staged fracturing process of the horizontal well is a common oil field production increasing measure, is especially suitable for the development of gas reservoirs and fractured oil reservoirs; the staged fracturing process applied to the casing at present mainly comprises a bridge plug perforation staged fracturing process and a hydraulic jet staged fracturing process; the bridge plug perforation staged fracturing process comprises the steps of setting a bridge plug for multiple times to seal a shaft, perforating and fracturing, and the process needs multiple times of pipe columns, is discontinuous in construction and long in operation period; and in the other hydraulic jet staged fracturing process, a sliding sleeve type hydraulic jet tool is put in advance, corresponding sections of sliding sleeves are opened step by step, and after the stage of transformation is completed, a ball is thrown to block a passage of the stage and open the passageThe next stage of sliding sleeve is subjected to reconstruction operation, and the reconstruction operation is repeated continuously until the sectional reconstruction of the whole horizontal well is completed; the existing bridge plug is used as a sectional tool for shale gas exploitation, along with the increase of the well depth, the bridge plug has long pulling-in time and high abnormal rate, and the operation period is prolonged; particularly, after the casing pipe is deformed, the bridge plug cannot be put in, so that lost sections are easily caused, and temporary plugging balls and temporary plugging agents are frequently adopted for temporarily plugging and fracturing the reservoir stratum in the current market, wherein the density of the temporary plugging balls and the temporary plugging agents is 1.2-1.5g/cm3The specific gravity is high; the temporary blocking effect of the upper part is poor; the temporary plugging agent is easy to accumulate, and has poor temporary plugging effect on the upper eyelet; after the temporary plugging ball stops applying pressure, the temporary plugging ball is easy to fall off and cannot keep stable sealing.
Disclosure of Invention
In view of the above, in order to overcome the above defects in the prior art, the present invention aims to provide a method for temporarily blocking and fracturing a reservoir by using a soluble polymer biological knot, wherein the method for temporarily blocking and fracturing the reservoir by using the soluble polymer biological knot adopts a rope knot type structure, and enters a fracturing eyelet from two end wings, and by using the characteristics of light density, complete degradation, no pollution, large pressure bearing capacity, high temperature resistance and good mechanical properties of the biological knot, the fracturing eyelet cannot fall off after compaction and temporary blocking, the sealing effect of the eyelet is good, the cost is low, the fracturing eyelet is not limited by the drift diameter in a shaft after being put into use, and the purpose of layering is conveniently achieved.
In order to achieve the aim, the invention provides a method for temporarily blocking and fracturing a reservoir stratum by using soluble polymer biological knots.
Further, the method comprises the following specific steps:
1) after the first section of the open hole well section is perforated by using an oil connecting or toe end sliding sleeve, preparing for construction fracturing;
2) in the construction and fracturing, soluble polymer organisms are used as a steering tool, and biological knots are put into the tool to perform steering fracturing on an unpressurized stratum or an unpressurized stratum.
Further, the input quantity of the biological knots is 1.0-1.2 times of the number of the perforation holes, and the pumping capacity of the biological knots is as follows: 1.0 to 4.0m3/min。
Further, in the step 2), soluble polymer organisms in construction fracturing are put in step by step, and the pressed open holes are blocked preferentially, so that the fracturing is shifted to the non-pressed open holes.
Further, in the step 2), designing a certain number of holes according to each section of perforation, and putting 1/2 number of biological knots into the first construction fracturing to perform diversion fracturing on the unpressurized stratum; after the construction is completed in the first step, 1/2 biological knots are put in the second step for diversion fracturing, the stratum is not pressed open, and the residual hole number is used as the next section of perforation pumping channel; and after the construction is completed in the second step, performing the next section of perforation, putting in the biological knots with the residual quantity in the upper section after the next section of perforation is completed to perform steering fracturing on the unpressurized stratum, and performing the upward section of fracturing construction after the pressure is changed in place.
Further, the method comprises the following specific steps:
1) after the first section of the open hole well section is perforated by using an oil connecting or toe end sliding sleeve, preparing for construction fracturing;
2) in the construction and fracturing, soluble polymer organisms are used as a steering tool, and biological knots are put into the tool to perform steering fracturing on the unpressurized stratum;
3) pumping strengthening liquid to block the upper perforation section;
4) after the perforation gun is put into the second section of the oil pipe to complete perforation, construction fracturing is prepared;
5) repeating the steps 2-4 to finish 3 sections of perforation;
6) according to the construction progress of connecting oil for one section of a day, after 3 sections of construction, injecting strengthening liquid to plug the 1/2/3 th layer, and strengthening the plugging effect;
7) repeating the steps to finish the construction of the casing deformation section;
8) injecting neutralizer through the coiled tubing, completely hydrating the reinforcer, and dissolving the soluble polymer biological knot.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the method for temporarily blocking the fractured reservoir by utilizing the soluble polymer biological knots, the soluble polymer biological knots are adopted to enter the fractured eyelets from the wings at the two ends, and the characteristics of light density, complete degradation, no pollution, large bearing capacity, high temperature resistance and good mechanical property of the biological knots are utilized, so that the fractured eyelets cannot fall off after compaction and temporary blocking, the eyelet sealing effect is good, the cost is low, the limitation of the drift diameter in a shaft is avoided after the fracturing and temporary blocking, and the purpose of layering is convenient to achieve;
2. in the method for temporarily blocking and fracturing the reservoir stratum by utilizing the soluble polymer biological knots, the density of the soluble polymer biological knots is only 1.06-1.1g/cm compared with that of the temporary blocking ball and the temporary blocking agent3The wing structure is easier to float and not easy to fall off, and the temporary blocking effect is more obvious.
3. In the method for fracturing the reservoir stratum by using the temporary plugging of the soluble polymer biological knots, the Rockwell hardness of the soluble polymer biological knots can reach 107MPa, the Vicat softening temperature can reach 207 ℃, the bending strength can reach 221MPa, the load deformation temperature can reach 81 ℃, the tensile strength can reach 122MPa, the tensile yield strain can reach 2.2%, the section internal standard nominal strain can reach 1.1%, the pressure bearing capacity can reach 70MPa, and the dissolving time is 3-15 days at the temperature of 70-150 ℃.
4. The method for temporarily blocking and fracturing the reservoir stratum by utilizing the soluble polymer biological knots has the following advantages:
1) the product is convenient to use, the operation efficiency is improved, and the operation cost is reduced;
2) the empennage and knot structure is adopted to effectively seal the eyelet hole, so that the sealing is reliable;
3) the full drift diameter of the shaft is ensured without shaft intervention after fracturing, and the shaft is not required to be communicated;
4) the bridge plug is prevented from being set midway or other faults caused by the bridge plug due to a shaft or other problems;
5) the casing variable well section bridge plug can not be lowered into a soluble bridge plug for sectional modification, and the novel environment-friendly biological junction performs sectional modification on the casing variable section;
6) temporary plugging and steering are realized, the stratum fracturing net structure is effectively realized, and stratum fractures are communicated.
Drawings
In order to make the object, technical scheme and beneficial effect of the invention more clear, the invention provides the following drawings for explanation:
FIG. 1 is a schematic structural diagram of a soluble polymer bioknot according to the present invention;
FIG. 2 is a diagram showing a state of a soluble polymer biological nodule temporarily plugging a fractured pore in the present invention;
FIG. 3 is a state diagram of a soluble polymer biological nodule temporary plugging casing variable well fracturing reservoir in the invention;
FIG. 4 is a state diagram of a soluble polymer biological nodule temporary plugging casing variable well fracture pore section in the invention;
FIG. 5 is a diagram showing the state of the soluble polymer biological nodule after temporarily blocking a fracturing hole of a casing variable well and injecting a strengthening liquid;
FIG. 6 is a line graph of dissolution rate versus temperature change after fracturing holes of a casing of a soluble polymer biological nodule temporary plugging casing of the present invention;
FIG. 7 is a line graph of the dissolution rate and acid concentration change after the soluble polymer biological nodule temporarily blocks a casing variable well fracture hole in the invention;
FIG. 8 is a line graph showing the dissolution rate and the concentration change of the alkali liquor after the biological nodule of the medium soluble polymer temporarily blocks the fractured hole of the casing variable well.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1-8 are schematic structural diagrams illustrating a method for temporarily plugging a fractured reservoir by using a soluble polymer biological knot according to the invention;
the first embodiment is as follows: method for performing temporary plugging and fracturing reservoir on conventional well
The invention relates to a method for temporarily blocking and fracturing a reservoir stratum by using soluble polymer biological knots.
Further, the method comprises the following specific steps:
1) after the first section of the open hole well section is perforated by using an oil connecting or toe end sliding sleeve, preparing for construction fracturing;
2) in the construction and fracturing, soluble polymer organisms are used as a steering tool, and biological knots are put into the tool to perform steering fracturing on the unpressurized stratum.
Further, the biological knot is put in an amount of1.0-1.2 times of perforation hole number, biological knot pumping capacity: 1.0-4.0 m3/min。
Further, in the step 2), soluble polymer organisms in construction fracturing are put in step by step, and the pressed open holes are blocked preferentially, so that the fracturing is shifted to the non-pressed open holes.
Further, in the step 2), according to the design of 48 holes of each section of perforation, 20 biological knots are put into the first construction fracturing to perform the turning fracturing on the unpressurized stratum; after the construction is completed in the first step, 18 biological knots are put into the second step to perform diversion fracturing and not press the stratum open, and the remaining 10 holes are used as a next section of perforation pumping channel; and after the construction is completed in the second step, performing the next section of perforation, putting the remaining 10 biological knots in the upper section after the next section of perforation is completed to perform steering fracturing on the unpressurized stratum, and performing the second section of fracturing construction after the pressure is changed in place.
In the soluble polymer biological junction, the temperature of the soluble polymer biological junction is 50-70 ℃ L-XT series, the temperature of the soluble polymer biological junction is 80-90 ℃ M-XT series, and the temperature of the soluble polymer biological junction is 100-150 ℃ H-XT series; the plugging device is suitable for plugging perforation holes of 10mm, 12mm and 15 mm. The large-size biological knot can be customized according to actual practice.
As shown in the table, LT, MT and HT series biological junction temperatures and different dissolution times can be adjusted and selected according to the well temperature and time design of a construction well section in 3-14 days, and the dissolution speed of the soluble polymer biological junction is accelerated along with the temperature rise; in actual use, according to well temperature and construction progress, the biological knots dissolved in different gradients are used, the biological knots dissolved slowly are used in the early construction period, and the biological knots dissolved quickly are used in the later construction period, so that the dissolution is completed as soon as possible after the construction.
At 90 ℃, under clean water conditions, the soluble polymer bionodules began to dissolve in 3 days, the bowknot portions completely ruptured in 6 days, and completely dissolved on day 11. After drying, weighing, the integral dissolution rate reaches 98.8%, and the degradation rate of the product in water is approximately the following equation:
V＝0.94X exp(23.65-9443/T)
wherein V is degradation rate (inches/day) and T is water temperature (Kelvin).
In an acid-base solution, the dissolution speed of a soluble polymer biological knot is accelerated, and the acidity of a liquid entering a well is controlled during construction, so that the novel environment-friendly biological knot is prevented from being dissolved in advance; meanwhile, if abnormal conditions occur, the acidic and alkaline liquid can be adopted to quickly dissolve the novel environment-friendly biological knots.
Example two: method for temporarily blocking and fracturing reservoir stratum of casing deformation well
The method comprises the following specific steps:
1) after the first section of the open hole well section is perforated by using an oil connecting or toe end sliding sleeve, preparing for construction fracturing;
2) in the construction and fracturing, soluble polymer organisms are used as a steering tool, and biological knots are put into the tool to perform steering fracturing on the unpressurized stratum.
3) Pumping strengthening liquid to block the upper perforation section.
4) After the perforation gun is put into the second section of the oil pipe to complete perforation, construction fracturing is prepared;
5) and repeating the steps 2-4 to finish 3 sections of perforation.
6) According to the construction progress of connecting oil for one section of a day, after 3 sections of construction, reinforcing liquid is injected to block the 1/2/3 th layer, and the blocking effect is reinforced.
7) And repeating the steps to finish the construction of the sheathing and transforming section.
8) Injecting neutralizer through the coiled tubing, completely hydrating the reinforcer, and dissolving the soluble polymer biological knot.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (6)
1. A method for temporarily plugging a fractured reservoir by using a soluble polymer biological node, which is characterized by comprising the following steps: in the staged fracturing process, soluble polymer nodules are pumped to plug the fracturing perforations after each stage completes the perforation.
2. A method for temporarily fracturing a reservoir using soluble polymer nodules according to claim 1, wherein: the method comprises the following specific steps:
1) after the first section of the open hole well section is perforated by using an oil connecting or toe end sliding sleeve, preparing for construction fracturing;
2) in the construction and fracturing, soluble polymer organisms are used as a steering tool, and biological knots are put into the tool to perform steering fracturing on an uncrushed or uncrushed stratum.
3. A method for temporarily fracturing a reservoir using soluble polymer nodules according to claim 2, wherein: the input quantity of the biological knots is 1.0-1.2 times of the number of the perforation holes, and the pumping capacity of the biological knots is as follows: 1.0 to 4.0m3/min。
4. A method for temporarily fracturing a reservoir using soluble polymer nodules according to claim 2 or 3, wherein: in the step 2), soluble polymer organisms in construction fracturing are put in step by step, and the pressed open holes are blocked preferentially, so that the fracturing is shifted to the non-pressed open holes.
5. The method of claim 4 for using soluble polymer nodules to temporarily fracture a reservoir, wherein: in the step 2), designing a certain number of holes according to each section of perforation, and putting 1/2 number of biological knots in the first construction fracturing step to perform diversion fracturing on the unpressurized stratum; after the construction is completed in the first step, 1/2 biological knots are put in the second step for diversion fracturing, the stratum is not pressed open, and the residual hole number is used as the next section of perforation pumping channel; and after the construction is completed in the second step, performing the next section of perforation, putting in the biological knots with the residual quantity in the upper section after the next section of perforation is completed to perform steering fracturing on the unpressurized stratum, and performing the upward section of fracturing construction after the pressure is changed in place.
6. A method for temporarily fracturing a reservoir using soluble polymer nodules according to claim 1, wherein: the method comprises the following specific steps:
1) after the first section of the open hole well section is perforated by using an oil connecting or toe end sliding sleeve, preparing for construction fracturing;
2) in the construction and fracturing, soluble polymer organisms are used as a steering tool, and biological knots are put into the tool to perform steering fracturing on an unpressurized stratum or an unpressurized stratum;
3) pumping strengthening liquid to block the upper perforation section;
4) after the perforation gun is put into the second section of the oil pipe to complete perforation, construction fracturing is prepared;
5) repeating the steps 2-4 to finish 3 sections of perforation;
6) according to the construction progress of connecting oil for one section of a day, after 3 sections of construction, injecting strengthening liquid to plug the 1/2/3 th layer, and strengthening the plugging effect;
7) repeating the steps to finish the construction of the casing deformation section;
8) injecting neutralizer through the coiled tubing, completely hydrating the reinforcer, and dissolving the soluble polymer biological knot.
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| CN202110882792.XA CN113586024A (en) | 2021-08-02 | 2021-08-02 | Method for temporarily blocking fractured reservoir by using soluble polymer biological knots |
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| CN202110882792.XA CN113586024A (en) | 2021-08-02 | 2021-08-02 | Method for temporarily blocking fractured reservoir by using soluble polymer biological knots |
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2021
- 2021-08-02 CN CN202110882792.XA patent/CN113586024A/en active Pending
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