CN113669009A - Method and system for decontaminating a retrograde condensation zone of a target well - Google Patents
Method and system for decontaminating a retrograde condensation zone of a target well Download PDFInfo
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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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
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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
- 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
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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
- 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
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
Abstract
The invention relates to the technical field of gas reservoir development and discloses a method and a system for removing pollution of a retrograde condensation area of a target well. The method comprises the following steps: performing windowing and sidetracking on a casing of a target well and a retrograde condensation area around an original artificial fracture along a preset direction of a target reservoir where the target well is located; fracturing the original artificial fracture to form a new artificial fracture with a perforation; injecting a carrier fluid carrying a plugging object into the new artificial fracture to temporarily plug the perforation on the new artificial fracture within a preset range along the direction of the maximum horizontal main stress of the target reservoir; and fracturing the retrograde condensation area drilled on the side to form a fracture system in the retrograde condensation area, so that the fracture system is communicated with a new artificial fracture after the plugging material is drained back along with the carrier fluid, and the condensate in the retrograde condensation area flows into the new artificial fracture through the fracture system. The invention can effectively remove the pollution of the whole reverse condensation area, and the removal period is long.
Description
Technical Field
The invention relates to the technical field of gas reservoir development, in particular to a method and a system for removing pollution of a retrograde condensation area of a target well.
Background
At present, a tight sandstone condensate gas reservoir is generally developed by fracturing reformation, and after the depletion development, a retrograde condensation area (or a retrograde condensation pollution (damage) zone) is formed near a well bore and an original artificial fracture along with the reduction of the formation pressure below a dew point pressure. For a compact sandstone condensate gas reservoir producing water, along with the reduction of gas phase permeability, the gas carrying capacity is reduced, formation water and condensate are gathered near a well and an original artificial fracture to form a retrograde condensation area (or a retrograde condensation damage zone), and formation gas cannot penetrate through the damage zone, so that a gas well cannot be opened. For example, a condensate field may have 1-10 wells with initial gas production of 5X 104m3The pressure difference of the ground dew is 2.17MPa, after the well is produced for 16 months, the gas production rate is reduced to 0.02 multiplied by 10 due to serious reverse condensation pollution4m3And d, finally closing the well.
At present, the methods of circular gas injection, methanol injection and huff and puff are mostly applied to gas wells with reverse condensation pollution on site, and the methods are suitable for the initial stage and the middle stage of reverse condensation pollution. The gas or fluid is injected into the oil-gas seepage channel to form miscible displacement with the condensate oil, so that the flowing state of the condensate oil can be improved, and the miscible condensate oil can be lifted out of the ground through the gas flow. For the retrograde condensation pollution generated in the later production stage of the fractured well, after circular gas injection, gas can extend to the direction of the maximum horizontal main stress along the artificial fractures, then the interfacial tension of the condensate oil gas in a retrograde condensation pollution area near the artificial fractures along the direction of the maximum horizontal main stress is reduced, the gas phase permeability and the flow state of the condensate oil are improved, therefore, retrograde condensation injury can be effectively relieved, but the gas is difficult to communicate with a reservoir far away from the direction of the maximum horizontal main stress, so that an oil ring far away from the direction of the maximum horizontal main stress cannot be relieved, the overall retrograde condensation relieving effect is greatly reduced, and the effective period for relieving retrograde condensation is short.
Disclosure of Invention
The invention aims to provide a method and a system for decontaminating a retrograde condensation zone of a target well, which can effectively decontaminate the whole retrograde condensation zone and have a long period of validity.
To achieve the above object, a first aspect of the present invention provides a method for decontaminating a retrograde condensation zone of a target well, the method comprising: performing windowing sidetrack drilling on a casing of the target well and the retrograde condensation area around the original artificial fracture along the preset direction of the target reservoir where the target well is located, wherein the included angle between the preset direction and the minimum horizontal main stress direction of the target reservoir is smaller than or equal to a preset angle, the original artificial fracture is located around the casing, and perforations are distributed on the edge of the original artificial fracture; fracturing the original artificial fracture to form a new artificial fracture having the perforations; injecting a carrier fluid carrying a plugging substance into the new artificial fracture to temporarily plug the perforations on the new artificial fracture within a preset range along the direction of the maximum horizontal principal stress of the target reservoir; and fracturing the retrograde region that has been sidetracked to form a fracture system in the retrograde region such that the fracture system communicates with the new artificial fracture after the plug has drained back with the carrier fluid and condensate in the retrograde region flows through the fracture system into the new artificial fracture.
Preferably, the windowing and sidetracking the casing of the target well and the retrograde condensation zone around the original artificial fracture comprises: and adopting a radial water jet process to perform windowing sidetrack drilling on the sleeve and the anti-condensation area along the direction of the minimum horizontal main stress.
Preferably, the performing of the window sidetrack on the casing and the retrograde condensation zone along the direction of the minimum horizontal principal stress using a radial water jet process comprises: and adopting a radial water jet process to perform windowing sidetrack drilling on the sleeve of the target well and the retrograde condensation region along the direction of the minimum horizontal main stress until the length of the drilled hole obtained by sidetrack drilling is equal to the radius of the condensate ring in the retrograde condensation region and/or the longitudinal density of the drilled hole obtained by sidetrack drilling is greater than or equal to a preset density.
Preferably, the fracturing of the original artificial fractures with perforations of the target well comprises: pretreating the original artificial crack; carrying out primary fracturing on the pretreated original artificial fracture by adopting a first fracturing fluid carrying a proppant with a first particle size; and carrying out secondary fracturing on the original artificial fracture subjected to primary fracturing by adopting a second fracturing fluid carrying a proppant with a second particle size, wherein the second particle size is larger than the first particle size, and the viscosity of the second fracturing fluid is larger than that of the first fracturing fluid.
Preferably, before performing the step of windowing sidetracking the casing of the target well and the retrograde condensation zone around the original artificial fracture, the method further comprises: judging the compressibility of the target reservoir of the target well and the stability of the well wall of the target well; and under the condition that the compressibility of the target reservoir reaches a preset compressible condition and the stability of the well wall reaches a preset stable condition, performing windowing sidetracking on the casing pipe of the target well and the retrograde condensation area.
By the technical scheme, the method creatively carries out windowing sidetrack drilling on the sleeve and the anti-condensation area along the direction of the minimum stress; then fracturing the original artificial fracture, and injecting a carrier fluid carrying a plugging object into a new artificial fracture formed after fracturing so as to temporarily plug the perforation on the new artificial fracture within (or near) a preset range along the direction of the maximum horizontal principal stress; finally, the retrograde region that has been sidetracked is fractured to form a fracture system within the region such that the fracture system is in communication with a new artificial fracture after the carrier fluid is drained, whereby condensate within the retrograde region can flow through the fracture system to the new artificial fracture or wellbore. The present invention can effectively remove the pollution of the whole reverse condensation area including the vicinity of the direction of the minimum principal stress, and the removal validity period is long.
A second aspect of the invention provides a system for decondensation contamination of a target well, the system comprising: the lateral drilling device is used for performing windowing lateral drilling on a casing of the target well and the retrograde condensation area around the original artificial fracture along the preset direction of the target reservoir where the target well is located, wherein the included angle between the preset direction and the minimum horizontal main stress direction of the target reservoir is smaller than or equal to a preset angle, the original artificial fracture is located around the casing, and perforations are distributed on the edge of the original artificial fracture; a first fracturing device for fracturing the original artificial fracture to form a new artificial fracture with the perforation; injecting a carrier fluid carrying plugs into the new artificial fracture to temporarily plug the perforations on the new artificial fracture within a preset range along the direction of the maximum horizontal principal stress of the target reservoir; and second fracturing means for fracturing the retrograde region that has been sidetracked to form a fracture system in the retrograde region such that the fracture system communicates with the new artificial fracture after the plug has drained back with the carrier fluid and condensate within the retrograde region flows through the fracture system into the new artificial fracture.
For details and advantages of the system for decontaminating a retrograde condensation zone of a target well according to the present invention, reference is made to the above description of the method for decontaminating a retrograde condensation zone of a target well, which is not repeated herein.
A third aspect of the invention provides a machine-readable storage medium having instructions stored thereon for causing a machine to perform the above-described method for decontaminating a retrograde condensation zone of a target well.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic illustration of a retrograde condensation zone of a target well provided by embodiments of the present invention;
FIG. 2 is a flow chart of a method for decontaminating a retrograde condensation zone of a target well provided by embodiments of the present invention;
FIG. 3 is a flow chart for fracturing a virgin artificial fracture provided by an embodiment of the present invention; and
FIG. 4 is a flow chart of a method for decontaminating a retrograde condensation zone of a target well provided by embodiments of the present invention.
Description of the reference numerals
1 borehole 2 original artificial fracture
3 reverse condensation zone 4 casing
10 sidetracking apparatus 20 first fracturing apparatus
30 injection device 40 second fracturing device
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Before describing a specific embodiment of the present invention, a brief description of the retrograde condensation zone of the target well will be provided. As shown in fig. 1, a retrograde condensation zone 3 is formed around the wellbore 1 (or casing 4) and the original artificial fracture 2 of the target well. Wherein the original artificial fractures 2 are located outside the casing 4 around the wellbore 1, and the edges of the original artificial fractures 2 may be located just at the outer wall of the casing 4 or may be at a distance from the outer wall of the casing 4, seen in the direction of the least horizontal principal stress. And the original artificial fractures 2 are provided with a certain distribution of regularly distributed perforations.
The process for decontaminating the retrograde condensation zone of a target well provided by the invention is a repeated fracturing process for decontaminating the retrograde condensation zone of a fractured well (namely the target well with formed original artificial fractures), particularly for a condensate reservoir with large maximum and minimum level main stress difference (for example, more than 10 MPa).
FIG. 2 is a flow chart of a method for decontaminating a retrograde condensation zone of a target well according to one embodiment of the present invention. As shown in fig. 2, the method may include the steps of: step S201, performing windowing sidetrack drilling on a casing of a target well and a retrograde condensation area around an original artificial fracture along a preset direction of a target reservoir where the target well is located, wherein an included angle between the preset direction and a minimum horizontal main stress direction of the target reservoir is smaller than or equal to a preset angle, the original artificial fracture is located around the casing, and perforations are distributed on the edge of the original artificial fracture; step S202, fracturing the original artificial fracture to form a new artificial fracture with the perforation; step S203, injecting carrier fluid carrying plugging objects into the new artificial fracture to temporarily plug the perforation on the new artificial fracture within a preset range along the direction of the maximum horizontal principal stress of the target reservoir; and S204, fracturing the retrograde condensation zone which is drilled on the side to form a fracture system in the retrograde condensation zone, so that the fracture system is communicated with the new artificial fracture after the plugging object flows back along with the carrier fluid, and the condensate in the retrograde condensation zone flows into the new artificial fracture through the fracture system.
Before performing step S201, the method may further include: judging the compressibility of a target reservoir of the target well and the stability of the well wall of the target well; and under the condition that the compressibility of the target reservoir reaches a preset compressible condition and the stability of the well wall reaches a preset stable condition, performing windowing sidetracking on the casing pipe of the target well and the retrograde condensation area.
First, the compressibility (or drillability) of the target reservoir of the target well may be evaluated using a Rickman brittleness index calculation method and a fracture toughness calculation method. Specifically, the fracability index FI is expressed as:
FI＝BIn*KIC_n (1)
in formula (1): FI is dimensionless; BIn is a forward normalized brittleness index, dimensionless; KIC _ n is an inverse normalized fracture toughness index, dimensionless. Wherein BIn and KIC _ n are determined by the following formulas (2) and (3), respectively.
BIn＝(BI-BImin)/(BImax-BImin) (2)
KIC_n＝(KIC_max-KIC)/(KIC_max-KIC_min) (3)
In formulae (2) and (3): BImax and BImin are respectively the maximum and minimum brittleness indexes of the target reservoir, and are dimensionless; KIC _ max and KIC _ min are the maximum and minimum fracture toughness index, MPa.m, of the target reservoir, respectively1/2(ii) a And BImax, BImin, KIC _ max, and KIC _ min are constants, and the values thereof are determined according to the actual situation of the target reservoir.
Secondly, taking finite element calculation software (for example, software ABAQUS) as a platform, considering a rock mass flow-solid coupling effect and a stress concentration phenomenon caused by drilling and removing of a straight well section with initial stress and a radial well rock block, establishing a borehole elastoplasticity model of a 3D target well (the target well can be a radial horizontal well), and researching the influence of ground stress difference, the azimuth angle of the target well, the radius of the target well, the length of the target well, the windowing position, the Young modulus and Poisson ratio on the stability of a well wall of the target well. The windowing position is a windowing sidetrack position in the next step S201 (the preset direction of the target reservoir, and an included angle between the preset direction and the minimum horizontal principal stress direction is smaller than or equal to a preset angle (for example, 10 degrees), for example, the minimum horizontal principal stress direction). The step is to demonstrate whether the requirements of windowing sidetrack drilling are met or not, such as the stability of the well wall in the direction of the minimum horizontal main stress.
And when the fracturing index of the target reservoir is greater than or equal to the preset fracturing index threshold value and the influence value on the stability of the well wall is smaller than the preset influence value, determining that the target reservoir meets the condition of next windowing sidetracking.
Since the peripheral retrograde region of the original artificial fractures of the target well along the direction of the minimum horizontal principal stress is not likely to form a complex fracture system when the target reservoir is repeatedly fractured in step S202, the casing and the retrograde region of the target well are windowed and sidetrack-drilled along the direction of the minimum horizontal principal stress in step S201.
Specifically, the windowing and sidetracking the casing and the retrograde condensation zone of the target well may include: and adopting a radial water jet process to perform windowing sidetrack drilling on the sleeve and the anti-condensation area along the direction of the minimum horizontal main stress. As shown in fig. 1, the result of sidetracking appears as two holes (a hole and B hole) in a 180 ° distribution when viewed in a horizontal cross section. In a preferred embodiment, the casing and the retrograde condensation zone are sidetracked in the direction of least horizontal principal stress until the sidetrack length is equal to the radius of the oil ring in the retrograde condensation zone, at which time the oil ring in the retrograde condensation contamination zone is completely penetrated. The distribution range of the oil rings (such as the radius of the oil rings) can be judged by determining the pressure distribution from the far end of the reservoir at the bottom of the well to the shaft by a numerical simulation method by combining the bottom flowing pressure of the target reservoir, the original formation pressure and the dew point pressure of the condensate gas reservoir.
In addition, in order to form a complex fracture system in the retrograde condensation zone, a radial water jet process can be adopted, and the casing and the retrograde condensation zone are subjected to windowing sidetracking along the longitudinal direction of the casing and the direction of the minimum horizontal main stress until the longitudinal density of the drilled holes obtained by sidetracking is greater than or equal to the preset density. Wherein the preset density is 1 hole/m.
Since the time for fracturing the reservoir of the target well to obtain the original artificial fracture is long from the initial time, and the conductivity of the original artificial fracture becomes poor, after the windowing sidetracking step of the casing and the retrograde condensation zone is completed, the original artificial fracture needs to be fractured again to recover the conductivity.
Specifically, for step S202, fracturing the original artificial fracture may include the following steps, as shown in fig. 3.
And S301, preprocessing the original artificial crack.
The reservoir near the original artificial fracture may be pretreated with an acid to decontaminate wells located around the target well and reduce the fracture pressure of the reservoir of the target well. And for the sandstone reservoir, selecting an acid liquid system of 7-15% (volume fraction) HCl + 3-5% (volume fraction) HF, and treating reservoir damage caused by long-term production and primary fracturing in artificial fractures of wells around the target well. In field implementation, an experiment is needed to screen an acid solution formula compatible with a reservoir stratum, specifically, the acid solution is selected by fully considering the mine characteristics of the reservoir stratum, conventional hydrochloric acid or earth acid is adopted, and the acid solution formula is optimized for an acid-sensitive reservoir stratum so as to prevent acid sensitivity; the acid liquor dosage can be comprehensively determined according to the fracturing crack simulation and the specific well condition and the fracturing process requirements.
And S302, performing primary fracturing on the pretreated original artificial fracture by using a first fracturing fluid carrying a proppant with a second particle size.
The small-particle size proppant can be carried by the low-viscosity fracturing fluid to initially reform the original artificial fracture. Specifically, a proppant carrying 70/140 mesh (bulk density of 1.5-1.8 g/cm) can be used3) The first fracturing fluid is used for fracturing construction. Wherein the first fracturing fluid can be conventional guanidine gum fracturing fluid, and the discharge capacity is 3.0-5.0m3The discharge amount is not more than the discharge amount of the fracturing fluid adopted in the process of obtaining the original artificial fracture, and the viscosity is below 30 mPa.s.
And S303, performing secondary fracturing on the primary artificial fracture subjected to the primary fracturing by using a second fracturing fluid carrying a proppant with a second particle size. And the second particle size is larger than the first particle size, and the viscosity of the second fracturing fluid is larger than that of the first fracturing fluid.
The high-viscosity fracturing fluid can be used for carrying a medium-particle-size propping agent, and the artificial fracture fractured for the first time is further expanded and modified so as to recover the flow conductivity of the original artificial fracture. Specifically, a proppant carrying 30/50 mesh (bulk density of 1.5-1.6 g/cm) can be used3) The second fracturing fluid is used for fracturing construction. Wherein the second fracturing fluid can be conventional guanidine gum fracturing fluid with discharge capacity of 4.0-6.0m3The discharge capacity of the second fracturing fluid can be optimized and adjusted according to the fracturing process requirement and the requirement of adding the proppant in the later high sand ratio stage, and the viscosity is 120-150 mPa.s.
After the new artificial fractures recover the conductivity, since some perforations are distributed on the new artificial fractures (after the original artificial fractures are formed, perforations with a certain distribution rule are artificially formed on the original artificial fractures), if the perforations near the direction of the maximum horizontal principal stress are not temporarily blocked in advance, in the process of fracturing the retrograde condensation zone in the step S204, almost all of the injected fracturing fluid flows into the retrograde condensation zone through the perforations in the direction of the maximum principal stress, so that only the retrograde condensation zone near the direction of the maximum horizontal principal stress is intensively fractured, but the retrograde condensation zone near the direction of the minimum horizontal principal stress is hardly fractured, and a fracture system cannot be formed in the retrograde condensation zone near the direction of the minimum horizontal principal stress, therefore, the perforations near the direction of the maximum horizontal principal stress need to be temporarily blocked in the step S203, the retrograde condensation zone is then fractured in step S204 to form a fracture system.
For step S203, a carrier fluid (e.g., a first fracturing fluid) carrying a cannon ball may be injected into the new artificial fracture. Taking the first fracturing fluid as an example, because the first fracturing fluid is acted by the maximum horizontal main stress, most of the first fracturing fluid flows to the vicinity of the direction of the maximum horizontal main stress, the cannon ball can be aligned to the hole near the direction of the maximum horizontal main stressThe eye is temporarily blocked. During the fracturing construction, the discharge capacity of the first fracturing fluid is 3.0-4.0m3And/min, the number of the shot eyeballs is 1.2-1.3 times of the number of the original perforation.
For step S204, the retrograde condensation zone that has been sidetracked may be modified with a low viscosity fracturing fluid carrying small particle size proppant. Specifically, a proppant carrying 70/140 mesh (bulk density of 1.5-1.8 g/cm) can be used3) And performing fracturing construction by using the third fracturing fluid. Wherein the third fracturing fluid can be conventional guanidine gum fracturing fluid with discharge capacity of 3.0-5.0m3Min, viscosity is below 20 mPa.s. Preferably, the viscosity of the third fracturing fluid is below 10 mpa.s; if the natural fracture of the reservoir is relatively developed, the viscosity can be increased appropriately according to the results of the fluid loss test and the fracture simulation, for example, the viscosity of the third fracturing fluid can be 10 to 20 mpa.s.
And as the perforation near the direction of the maximum horizontal principal stress is temporarily blocked, the third fracturing fluid can flow into the retrograde condensation zone through the channel in the direction of the minimum horizontal principal stress obtained by sidetracking so as to fracture the retrograde condensation zone at the position, thereby forming a fracture system in the retrograde condensation zone in the direction of the minimum horizontal principal stress. And after the shot hole ball returns along with the fracturing fluid, the fracture system is communicated with a new artificial fracture, and at the moment, condensate oil generated by reverse condensation can flow to the new artificial fracture and the shaft through the fracture system, so that the pollution of a reverse condensation area of the target well can be relieved, and the capacity of the target well is recovered.
In summary, the present invention creatively performs the windowing sidetrack drilling of the casing and the retrograde condensation zone along the preset direction near the direction of the minimum horizontal principal stress; then fracturing the original artificial cracks, and injecting a carrying fluid carrying a plugging object into the new artificial cracks formed after fracturing, so as to temporarily plug the perforation on the new artificial cracks within a preset range along the direction of the maximum horizontal main stress; finally, the retrograde region that has been sidetracked is fractured to form a fracture system within the region such that the fracture system is in communication with a new artificial fracture after the carrier fluid is drained, whereby condensate within the retrograde region can flow through the fracture system to the new artificial fracture or wellbore. The present invention can effectively remove the pollution of the whole reverse condensation area including the vicinity of the direction of the minimum principal stress, and the removal validity period is long.
FIG. 4 is a block diagram of a system for decontaminating a target well from retrograde condensation provided by an embodiment of the present invention. As shown in fig. 4, the system may include: the sidetracking device 10 is used for performing windowing sidetracking on a casing of the target well and the retrograde condensation area around the original artificial fracture along the preset direction of the target reservoir where the target well is located, wherein an included angle between the preset direction and the minimum horizontal principal stress direction of the target reservoir is smaller than or equal to a preset angle, the original artificial fracture is located around the casing, and perforations are distributed on the edge of the original artificial fracture; a first fracturing device 20 for fracturing the original artificial fracture to form a new artificial fracture having the perforation; an injection device 30 for injecting a carrier fluid carrying plugs into the new artificial fracture to temporarily plug the perforations on the new artificial fracture within a preset range along the direction of maximum horizontal principal stress of the target reservoir; and a second fracturing device 40 for fracturing the retrograde region that has been sidetracked to form a fracture system in the retrograde region such that the fracture system communicates with the new artificial fracture after the plug has drained back with the carrier fluid and condensate in the retrograde region flows through the fracture system into the new artificial fracture.
Preferably, the sidetracking device for windowing and sidetracking the casing of the target well and the retrograde condensation zone around the original artificial fracture comprises: and adopting a radial water jet process to perform windowing sidetrack drilling on the sleeve and the anti-condensation area along the direction of the minimum horizontal main stress.
Preferably, the sidetracking device is used for windowing the casing and the retrograde condensation zone along the direction of the minimum horizontal principal stress using a radial water jet process, and comprises: and adopting a radial water jet process to perform windowing sidetrack drilling on the sleeve of the target well and the retrograde condensation region along the direction of the minimum horizontal main stress until the length of the drilled hole obtained by sidetrack drilling is equal to the radius of the condensate ring in the retrograde condensation region and/or the longitudinal density of the drilled hole obtained by sidetrack drilling is greater than or equal to a preset density.
Preferably, the first fracturing device comprises: the pretreatment module is used for pretreating the original artificial crack; the first fracturing module is used for performing first fracturing on the pretreated original artificial fracture by adopting first fracturing fluid carrying a proppant with a first particle size; and the second fracturing module is used for performing secondary fracturing on the original artificial fracture subjected to primary fracturing by adopting second fracturing fluid carrying proppant with a second particle size, wherein the second particle size is larger than the first particle size, and the viscosity of the second fracturing fluid is larger than that of the first fracturing fluid.
Preferably, the system further comprises: and the judging device is used for judging the compressibility of the target reservoir of the target well and the stability of the well wall of the target well, and correspondingly, the sidetracking device performs window sidetracking on the casing and the retrograde condensation area of the target well under the condition that the judgment device judges that the compressibility of the target reservoir reaches a preset compressible condition and the stability of the well wall reaches a preset stable condition.
For details and advantages of the system for decontaminating a retrograde condensation zone of a target well according to the present invention, reference is made to the above description of the method for decontaminating a retrograde condensation zone of a target well, which is not repeated herein.
The present invention also provides a machine-readable storage medium having instructions stored thereon for causing a machine to perform the above-described method for decontaminating a retrograde condensation zone of a target well.
The machine-readable storage medium includes, but is not limited to, Phase Change Random Access Memory (PRAM, also known as RCM/PCRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), Flash Memory (Flash Memory) or other Memory technology, compact disc read only Memory (CD-ROM), Digital Versatile Disc (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, and various media capable of storing program code.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (11)
1. A method for decontaminating a retrograde condensation zone of a target well, the method comprising:
performing windowing sidetrack drilling on a casing of the target well and the retrograde condensation area around the original artificial fracture along the preset direction of the target reservoir where the target well is located, wherein the included angle between the preset direction and the minimum horizontal main stress direction of the target reservoir is smaller than or equal to a preset angle, the original artificial fracture is located around the casing, and perforations are distributed on the edge of the original artificial fracture;
fracturing the original artificial fracture to form a new artificial fracture having the perforations;
injecting a carrier fluid carrying a plugging substance into the new artificial fracture to temporarily plug the perforations on the new artificial fracture within a preset range along the direction of the maximum horizontal principal stress of the target reservoir; and
fracturing the retrograde region that has been sidetracked to form a fracture system in the retrograde region such that the fracture system communicates with the new artificial fracture after the plug has drained back with the carrier fluid and through which condensate in the retrograde region flows into the new artificial fracture.
2. The method for decontaminating a retrograde region of a target well according to claim 1, wherein the window sidetracking of the casing of the target well and the retrograde region around the original artificial fracture comprises:
and adopting a radial water jet process to perform windowing sidetrack drilling on the sleeve and the anti-condensation area along the direction of the minimum horizontal main stress.
3. The method for decontaminating a retrograde region of a target well according to claim 2, wherein the window sidetracking the casing and the retrograde region in the direction of least horizontal principal stress using a radial water jet process comprises:
and adopting a radial water jet process to perform windowing sidetracking on the sleeve and the retrograde condensation region along the direction of the minimum horizontal main stress until the length of a drilled hole obtained by sidetracking is equal to the radius of a condensate oil ring in the retrograde condensation region and/or the longitudinal density of the drilled hole obtained by sidetracking is greater than or equal to a preset density.
4. The method for decontaminating a retrograde condensation zone of a target well according to claim 1, wherein the fracturing the original artificial fracture comprises:
pretreating the original artificial crack;
carrying out primary fracturing on the pretreated original artificial fracture by adopting a first fracturing fluid carrying a proppant with a first particle size; and
carrying out secondary fracturing on the original artificial fracture subjected to primary fracturing by adopting a second fracturing fluid carrying a proppant with a second particle size,
and the second particle size is larger than the first particle size, and the viscosity of the second fracturing fluid is larger than that of the first fracturing fluid.
5. The method for decontaminating a retrograde region of a target well according to claim 1, wherein prior to performing the step of windowing sidetracking the casing of the target well and the retrograde region around the original artificial fracture, the method further comprises:
judging the compressibility of the target reservoir of the target well and the stability of the well wall of the target well; and
and under the condition that the compressibility of the target reservoir reaches a preset compressible condition and the stability of the well wall reaches a preset stable condition, performing windowing sidetracking on the casing pipe and the retrograde condensation area of the target well.
6. A system for decontaminating a target well against retrograde condensation, the system comprising:
the lateral drilling device is used for performing windowing lateral drilling on a casing of the target well and the retrograde condensation area around the original artificial fracture along the preset direction of the target reservoir where the target well is located, wherein the included angle between the preset direction and the minimum horizontal main stress direction of the target reservoir is smaller than or equal to a preset angle, the original artificial fracture is located around the casing, and perforations are distributed on the edge of the original artificial fracture;
a first fracturing device for fracturing the original artificial fracture to form a new artificial fracture with the perforation;
injecting a carrier fluid carrying plugs into the new artificial fracture to temporarily plug the perforations on the new artificial fracture within a preset range along the direction of the maximum horizontal principal stress of the target reservoir; and
and second fracturing means for fracturing the retrograde region that has been sidetracked to form a fracture system in the retrograde region such that the fracture system communicates with the new artificial fracture after the plug has drained back with the carrier fluid and through which condensate in the retrograde region flows into the new artificial fracture.
7. The system for decontaminating a retrograde region of a target well according to claim 6, wherein the sidetracking apparatus for windowing the casing of the target well and the retrograde region around the original artificial fracture comprises:
and adopting a radial water jet process to perform windowing sidetrack drilling on the sleeve and the anti-condensation area along the direction of the minimum horizontal main stress.
8. The system for decontaminating a retrograde region of a target well of claim 7, wherein the sidetracking apparatus for windowing the casing and the retrograde region in the direction of least horizontal principal stress using a radial water jet process comprises:
and adopting a radial water jet process to perform windowing sidetrack drilling on the sleeve of the target well and the retrograde condensation region along the direction of the minimum horizontal main stress until the length of the drilled hole obtained by sidetrack drilling is equal to the radius of the condensate ring in the retrograde condensation region and/or the longitudinal density of the drilled hole obtained by sidetrack drilling is greater than or equal to a preset density.
9. The system for decontaminating a retrograde condensation zone of a target well according to claim 6, wherein the first fracturing device comprises:
the pretreatment module is used for pretreating the original artificial crack;
the first fracturing module is used for performing first fracturing on the pretreated original artificial fracture by adopting first fracturing fluid carrying a proppant with a first particle size; and
the second fracturing module is used for carrying out secondary fracturing on the primary artificial fracture subjected to the primary fracturing by adopting second fracturing fluid carrying a proppant with a second particle size,
and the second particle size is larger than the first particle size, and the viscosity of the second fracturing fluid is larger than that of the first fracturing fluid.
10. The system for decontaminating a retrograde condensation zone of a target well according to claim 6, further comprising:
a judging device for judging the compressibility of the target reservoir of the target well and the stability of the well wall of the target well,
correspondingly, under the condition that the judging device judges that the compressibility of the target reservoir reaches a preset compressible condition and the stability of the well wall reaches a preset stable condition, the sidetracking device performs windowing sidetracking on the casing and the retrograde condensation area of the target well.
11. A machine-readable storage medium having stored thereon instructions for causing a machine to perform the method for decontaminating a retrograde condensation zone of a target well of any of claims 1 to 5.
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