CN116927699A - Stratum stress resetting method for preventing deformation of casing - Google Patents
Stratum stress resetting method for preventing deformation of casing Download PDFInfo
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- CN116927699A CN116927699A CN202310958893.XA CN202310958893A CN116927699A CN 116927699 A CN116927699 A CN 116927699A CN 202310958893 A CN202310958893 A CN 202310958893A CN 116927699 A CN116927699 A CN 116927699A
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- stratum
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 239000011435 rock Substances 0.000 claims abstract description 38
- 238000005553 drilling Methods 0.000 claims abstract description 35
- 230000015572 biosynthetic process Effects 0.000 claims description 30
- 238000005516 engineering process Methods 0.000 claims description 10
- 238000012544 monitoring process Methods 0.000 claims description 7
- 239000011148 porous material Substances 0.000 claims description 7
- 206010017076 Fracture Diseases 0.000 claims description 5
- 206010041541 Spinal compression fracture Diseases 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 230000001788 irregular Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 230000019637 foraging behavior Effects 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
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
- 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
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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
- E21B47/00—Survey of boreholes or wells
- E21B47/007—Measuring stresses in a pipe string or casing
-
- 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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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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)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention discloses a stratum stress resetting method for preventing a sleeve from deforming, which comprises the following steps: determining a target position of a stratum where the casing is positioned, which has fault sliding risk, and setting perforation holes at positions on the casing corresponding to the target position; drilling a stratum drilling tool with a stratum rock crushing tool at the front end from a perforation to a stratum to extend to a target position; and starting a stratum rock crushing tool to crush the rock blocks at the target position, so that the stratum rock at the target position can uniformly press the sleeve under the load. The method provided by the invention has the advantages that the larger rocks in the stratum around the sleeve are crushed into small rocks, so that the outer surface of the sleeve and the stratum rocks can be fully contacted, the sleeve is changed from nonuniform loading to uniform loading, the service life of the sleeve is prolonged, the method is simple to operate and low in cost, the gap of the prior art on the layer is overcome, the well completion quality is greatly improved, the occurrence of underground accidents is effectively reduced, and the production cost of an oil-gas well is greatly reduced.
Description
Technical Field
The invention relates to the technical field of oil and gas development, in particular to a stratum stress resetting method for preventing casing deformation.
Background
With the rapid development of social economy and the annual increase of the demand of petroleum resources, with the increase of development of oil and gas wells, drilling and completion engineering is more challenging, the casing deformation of shale gas wells always puzzles on site personnel and drilling and completion engineers in the current petroleum field, few methods which can be effectively solved at present are adopted, and the casing deformation is prevented in a preventive mode, such as thickening the casing and improving the quality of a well rail. The uneven load of irregular rock blocks around the casing in the stratum on the casing is a main problem of causing the casing to deform, the specific loading condition of the casing at each position of uneven load is different, in the long and narrow underground casing, uneven pressed positions are many, if the quality of a well rail is improved, the technical requirement is high, and if the casing is thickened, a large amount of cost is also increased, so that the problems cannot be completely solved by the measures. There is a need today to find a way to overcome the above difficulties and to fully address the problem of deformation of shale gas well casing.
Disclosure of Invention
In order to achieve the technical purpose, the invention provides a stratum stress resetting method for preventing the deformation of a sleeve, larger rocks in stratum around the sleeve are crushed into small rock blocks, the extrusion action of stratum irregular rocks on the sleeve is changed, the outer surface of the sleeve can be fully contacted with the stratum rocks, and the sleeve is changed from nonuniform loading to uniform loading, so that the service life of the sleeve is prolonged.
The invention specifically discloses the following technical scheme:
a method of resetting formation stress for preventing deformation of a casing, comprising the steps of:
determining a target position of a stratum where the casing is positioned, which has fault sliding risk, and setting perforation holes at positions on the casing corresponding to the target position;
drilling a stratum drilling tool with a stratum rock crushing tool at the front end from a perforation to a stratum to extend to a target position;
and starting a stratum rock crushing tool to crush the rock blocks at the target position, so that the stratum rock at the target position can uniformly press the sleeve under the load.
In some preferred embodiments, the method for determining the target position of the stratum where the casing is located, which has a fault sliding risk, comprises the following steps:
identifying formation cracks and determining crack positions by using ant body technology;
and establishing a geomechanical model based on stratum stress and fault data, and analyzing and obtaining a position of the stratum where the sleeve is positioned, which has a fault sliding risk, as a target position.
In some preferred embodiments, the number of perforations is 2-12.
In some preferred embodiments, the method further comprises the step of:
after the crushing is completed, the stratum drilling tool is retracted;
and monitoring the stratum state around the sleeve by using a microseism monitoring technology, and analyzing to obtain the analysis fault sliding condition.
In some preferred embodiments, the method for analyzing the position of the stratum where the casing is located and having fault sliding risk comprises the following steps:
obtaining a fault sliding probability function related to pore pressure by using a mole-coulomb criterion;
and evaluating the fault sliding risk based on the hydraulic fracture induced pore pressure disturbance value and the fault sliding probability function.
In some preferred embodiments, the drilling trajectory of the formation drilling tool is determined by iterative evaluation of fault slip risk for passing target points.
In some preferred embodiments, stress sensors are also provided on the formation drilling tool for collecting and transmitting formation stress data after crushing during recovery after crushing.
In some preferred embodiments, the method of comminuting rock mass at a target location comprises: either of burst fracture and electric pulse fracture.
Advantageous effects
According to the method, larger rocks in the stratum around the casing are crushed into small rock blocks, the extrusion effect of irregular rocks of the stratum on the casing is changed, the outer surface of the casing and the stratum rocks can be fully contacted, and the casing is changed from nonuniform loading to uniform loading, so that the service life of the casing is prolonged.
Drawings
FIG. 1 is a flow chart of a method for resetting formation stress for preventing deformation of a casing according to a preferred embodiment of the present invention;
FIG. 2 is a flow chart of a method for resetting formation stress for preventing deformation of a casing according to another preferred embodiment of the present invention;
FIG. 3 is a schematic diagram showing the effect of identifying formation cracks and determining the crack location using ant body technology in another preferred embodiment of the present invention;
fig. 4 is a schematic view showing the drilling effect of a formation drilling tool provided with a formation rock crushing tool at the front end in another preferred embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent. In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Example 1
As shown in fig. 1, the present embodiment provides a method for resetting formation stress for preventing deformation of a casing, which specifically includes the steps of:
s1, determining a target position of the stratum where the casing is located, which has fault sliding risk, and setting perforation holes at positions on the casing corresponding to the target position. The method for determining the target position of the stratum where the casing is located, which has fault sliding risk in the prior art, mainly comprises the following steps: (1) seismic exploration techniques: and analyzing parameters such as the structure, lithology, cracks, stress and the like of the stratum by utilizing the propagation characteristics of the seismic waves in the stratum, and judging whether the stratum has a sliding risk or not. (2) drilling test technique: and (3) evaluating indexes such as mechanical properties, fluid pressure, permeability and the like of the stratum by using data such as logging, coring, pressure test and the like in the drilling process, and judging whether the stratum has a sliding risk or not. The above method has disadvantages in that the operation is not easy, and the economic cost and the manpower cost are high, and the time for obtaining the result is long. In some preferred embodiments, a method for determining a target position of a stratum where a casing is located, where the stratum has a fault sliding risk by using a numerical simulation method is provided, which specifically includes:
s101, identifying stratum cracks and determining crack positions by utilizing an ant body technology; the ant body technology is a three-dimensional seismic interpretation technology formed based on an ant algorithm, and the main principle is to simulate a series of group instinct actions and information feedback generated by the foraging behavior of a real ant colony body, and the description and identification of the ant colony body and the foraging behavior are completed by utilizing the amplitude and phase differences in seismic data and moving along possible faults and cracks. The recognition result is shown in fig. 3.
S102, establishing a geomechanical model based on stratum stress and fault data, and analyzing and obtaining a position of the stratum where the sleeve is located, wherein the position has fault sliding risk, and the position is set as a target position. It should be appreciated that there are many methods in the art for assessing fault sliding risk, such as using seismic data, imaging logs, multi-arm borehole logs, etc., to identify fault location, occurrence, type and activity, and to build fault models for analysis. And a fault sliding risk judging method based on the theory of pore elastic mechanics.
Further, in the design of the drilling path of the formation drilling tool, the area with fault sliding risk needs to be avoided, and the drilling work must also affect the formation stress on the path, so that the fault sliding risk on the subsequent path needs to be evaluated in time in the drilling process, in some preferred embodiments, the simulation path fitted by multiple target points is considered to be set between the target position and the perforation, and the optimal drilling path is determined by performing iterative evaluation of the fault sliding risk on the passing target points.
And S2, drilling the stratum drilling tool with the stratum rock crushing tool arranged at the front end from the perforation to the stratum to reach a target position.
The formation rock crushing tool is selected from crushing tools commonly used in the art, such as an explosion generator, a high-frequency pulse generator, a vibration generator and the like, and the invention is not limited thereto.
The perforation means that a plurality of pore passages are opened between a casing pipe, a cement sheath and a stratum of the oil and gas well, so that oil and gas in the stratum can flow out. The principle of perforation is to use high explosive to explode to form jet streams which penetrate the casing wall and cement layer at high velocity and high temperature and penetrate a depth in the formation. Various perforation methods are commonly used, such as cable conveying perforation, oil pipe conveying perforation, directional perforation, double perforation and the like. The effectiveness of perforation depends on factors such as the specification and model of the perforating gun, the loading capacity of the perforating charges, the pore density, the aperture and the like. In some preferred embodiments, the number and location of perforations is determined by the non-uniform loading created by the formation, with the principle set at a limit that does not reduce the loading of the original casing, preferably 2 to 12 perforations.
The direction of the drilling path of the formation drilling tool is angled with respect to the casing in accordance with the actual situation being detected, and in some preferred embodiments the direction of the drilling path is angled with respect to the casing in the range of 0 ° -90 ° and the extension length is in the range of 50 meters to 500 meters. Further, the formation drilling tool ensures that the formation rock crushing tool does not work ahead of time or the generator fails during the drilling process. The drilling effect is shown in fig. 4.
S3, starting a stratum rock crushing tool to crush the rock blocks at the target position, so that stratum rock at the target position can uniformly press the sleeve under load. Large rock blocks in the stratum are crushed into small rock blocks, so that stratum stress of the non-uniform load extrusion sleeve is reset, and stratum rock uniformly presses the sleeve. In some preferred embodiments, the method of comminuting rock mass at a target location comprises: either of burst fracture and electric pulse fracture. The specific rock mass crushing method can be preferentially applied by a person skilled in the art according to the actual situation of the site.
In some preferred embodiments, as shown in fig. 2, further comprising:
s4, after crushing is completed, the stratum drilling tool is retracted; in the process, a stress sensor can be further arranged on the stratum drilling tool and used for collecting and transmitting the crushed stratum stress data along the way in the recovery process after crushing. The sensors also need to transmit the collected data back to the surface for use in subsequent steps after the formation stress data is collected.
S5, monitoring stratum states around the sleeve by using a microseism monitoring technology, and analyzing to obtain the analysis fault sliding condition. Specifically, the implementation steps of the microseism monitoring technology include:
hydraulic fracturing produces microseismic released elastic waves with frequencies varying approximately in the 200-2000 Hz sonic frequency range. The elastic wave signals can be detected in an adjacent well by adopting a proper receiver, and the specific position, seam height, seam length and azimuth parameters of the microseism can be judged through analysis and processing. And further judging the fault sliding condition.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A method of resetting formation stress for preventing deformation of a casing, comprising the steps of:
determining a target position of a stratum where the casing is positioned, which has fault sliding risk, and setting perforation holes at positions on the casing corresponding to the target position;
drilling a stratum drilling tool with a stratum rock crushing tool at the front end from a perforation to a stratum to extend to a target position;
and starting a stratum rock crushing tool to crush the rock blocks at the target position, so that the stratum rock at the target position can uniformly press the sleeve under the load.
2. The method for resetting formation stress for preventing deformation of a casing according to claim 1, wherein the method for determining a target location of the formation in which the casing is located at risk of fault sliding comprises:
identifying formation cracks and determining crack positions by using ant body technology;
and establishing a geomechanical model based on stratum stress and fault data, and analyzing and obtaining a position of the stratum where the sleeve is positioned, which has a fault sliding risk, as a target position.
3. The method for resetting formation stress for preventing deformation of casing according to claim 1, wherein the number of perforations is 2-12.
4. The method for resetting formation stress for preventing deformation of a casing as recited in claim 1, further comprising the steps of:
after the crushing is completed, the stratum drilling tool is retracted;
and monitoring the stratum state around the sleeve by using a microseism monitoring technology, and analyzing to obtain the analysis fault sliding condition.
5. The method for resetting the stress of a formation to prevent deformation of a casing according to claim 2, wherein the analyzing the position of the formation where the casing is at risk of sliding in the fault comprises:
obtaining a fault sliding probability function related to pore pressure by using a mole-coulomb criterion;
and evaluating the fault sliding risk based on the hydraulic fracture induced pore pressure disturbance value and the fault sliding probability function.
6. The method for preventing deformation of a casing according to claim 5, wherein: the drilling path of the formation drilling tool is determined by iterative evaluation of the risk of fault slippage at the passing target point.
7. The method for preventing deformation of a casing according to claim 4, wherein: the stratum drilling tool is also provided with a stress sensor which is used for collecting and transmitting broken stratum stress data along the way in the recovery process after the crushing is completed.
8. The method for preventing deformation of casing formation stress resetting of claim 1, wherein the method of comminuting rock mass at the target location comprises: either of burst fracture and electric pulse fracture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310958893.XA CN116927699A (en) | 2023-08-01 | 2023-08-01 | Stratum stress resetting method for preventing deformation of casing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310958893.XA CN116927699A (en) | 2023-08-01 | 2023-08-01 | Stratum stress resetting method for preventing deformation of casing |
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| Publication Number | Publication Date |
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| CN116927699A true CN116927699A (en) | 2023-10-24 |
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| CN202310958893.XA Pending CN116927699A (en) | 2023-08-01 | 2023-08-01 | Stratum stress resetting method for preventing deformation of casing |
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| CN (1) | CN116927699A (en) |
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2023
- 2023-08-01 CN CN202310958893.XA patent/CN116927699A/en active Pending
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