CN110965990A - Casing damage factor determination method and device - Google Patents
Casing damage factor determination method and device Download PDFInfo
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- CN110965990A CN110965990A CN201811147835.4A CN201811147835A CN110965990A CN 110965990 A CN110965990 A CN 110965990A CN 201811147835 A CN201811147835 A CN 201811147835A CN 110965990 A CN110965990 A CN 110965990A
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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
- E21B47/00—Survey of boreholes or wells
- E21B47/04—Measuring depth or liquid level
Abstract
The application discloses a method and a device for determining damage factors of a casing, and belongs to the field of petroleum and natural gas exploitation. The method comprises the following steps: determining a first depth range of a damage location in a target casing within a target well; detecting whether the target well meets a first condition; when the target well meets a first condition, acquiring a buckling strength threshold value of the target casing and stress applied to a damaged position of the target casing within a first depth range; judging whether the stress applied to the damaged position of the target casing in the first depth range is greater than the buckling strength threshold of the target casing; determining a failure factor for the target cannula when the target cannula is subjected to a stress greater than a buckling strength threshold of the target cannula at a failure location within the first depth range comprises: mudstone hydration factors. The application provides a method for determining a casing damage factor, and is used for determining the casing damage factor.
Description
Technical Field
The application relates to the field of oil and gas exploitation, in particular to a method and a device for determining damage factors of a casing.
Background
Casing is a metal pipe that supports a wall of or a bore hole in a hydrocarbon well. Casing plays an important role in the production of oil and gas.
The casing is easy to damage (such as reducing, bending and the like) in the oil and gas exploitation process, the factors causing the casing damage can be determined as soon as possible, the development of the oil and gas well can be adjusted in time, and the loss in the oil and gas exploitation process is reduced.
Accordingly, a method of determining a casing damage factor is needed.
Disclosure of Invention
The application provides a method and a device for determining casing damage factors, which can solve the problem that the casing damage factors cannot be determined in the prior art, and the technical scheme is as follows:
in one aspect, a casing damage factor determination method is provided, in which a target casing to be tested is located in a target well, the method comprising:
determining a first depth range within the target well for a location of a damage in the target casing;
detecting whether the target well satisfies a first condition, the first condition comprising: the position of the first depth range in the target well is located in a mud rock stratum, and a water flow channel is formed between a cement pipe sleeved outside the target sleeve and the mud rock stratum;
when the target well meets the first condition, acquiring a buckling strength threshold of the target casing and stress suffered by the target casing in the first depth range;
judging whether the stress applied to the damaged position of the target casing in the first depth range is greater than the buckling strength threshold of the target casing;
determining a failure factor for the target cannula when the target cannula is subjected to a stress greater than a buckling strength threshold of the target cannula at a failure location within the first depth range comprises: mudstone hydration factors.
Optionally, determining a plurality of first reference wells which are at a distance from the target well less than a first preset distance, wherein the first reference wells and the target well have the same extension direction in the first depth range;
detecting whether a portion of the casing within each first reference well within the first depth range is damaged;
determining a damage factor for the target casing when all of the portions of the casings within the first depth range within the first plurality of reference wells are damaged comprises: fault factors.
Optionally, before the determining a plurality of first reference wells having a distance to the target well less than a first preset distance, the method further comprises:
detecting whether the first depth range in the target well is located in a fault;
when the first depth range in the target well is not located in the fault, acquiring the minimum distance between the first depth range and the fault;
determining whether the target well satisfies a second condition, the second condition comprising: the minimum distance is smaller than a second preset distance, or the position of the first depth range is located in the fault;
the determining a plurality of first reference wells having a distance to the target well less than a first preset distance comprises: determining a plurality of first reference wells having a distance to the target well less than the first preset distance when the target well satisfies the second condition.
Optionally, the method further comprises:
detecting whether the first depth range in the target well is located in a sand layer;
when the first depth range is located in the sand layer, determining a second reference well, performing sand control operation in the first depth range in the second reference well, wherein the distance between the second reference well and the target well is smaller than a third preset distance, and the extension directions of the second reference well and the target well in the first depth range are consistent;
determining whether a portion of the casing within the second reference well within the first depth range is damaged;
when the part of the casing in the second reference well, which is positioned in the first depth range, is damaged, judging whether the stress applied to the target casing at the damaged position in the first depth range is greater than the buckling strength threshold of the target casing;
determining a failure factor for the target casing when a portion of the casing in the second reference well in which the sand control operation was performed is undamaged and a portion of the casing in the target well in which the sand control operation was not performed is damaged, or when the target casing is subjected to a stress greater than a buckling strength threshold of the target casing at a damaged location within the first depth range, comprises: sand production factor.
Optionally, the method further comprises:
detecting whether a portion of an inner tube of the target well within the first depth range is corroded;
determining a damage factor of the target casing when a portion of the inner tube within the first depth range is corroded comprises: and (4) corrosion factors.
In another aspect, there is provided a casing damage factor determination apparatus in which a target casing to be tested is located in a target well, the casing damage factor determination apparatus comprising:
a first determination module to determine a first depth range within the target well of a damage location in the target casing;
a first detection module to detect whether the target well satisfies a first condition, the first condition comprising: the position of the first depth range in the target well is located in a mud rock stratum, and a water flow channel is formed between a cement pipe sleeved outside the target sleeve and the mud rock stratum;
a first obtaining module, configured to obtain a buckling strength threshold of the target casing and a stress experienced by the target casing within the first depth range when the target well satisfies the first condition;
the first judging module is used for judging whether the stress applied to the damaged position of the target casing in the first depth range is larger than the buckling strength threshold of the target casing;
a second determination module for determining a failure factor of the target cannula when the target cannula is stressed at the failure location within the first depth range above a buckling strength threshold of the target cannula, comprising: mudstone hydration factors.
Optionally, the apparatus for determining a casing damage factor further comprises:
a third determination module, configured to determine a plurality of first reference wells that are located at a distance from the target well that is less than a first preset distance, where the first reference wells and the target well have a same extending direction within the first depth range;
a second detection module for detecting whether a portion of the casing within each first reference well within the first depth range is damaged;
a fourth determination module to determine a damage factor for the target casing when all of the portions of the casings within the first depth range within the first plurality of reference wells are damaged, comprising: fault factors.
Optionally, the apparatus for determining a casing damage factor further comprises:
the third detection module is used for detecting whether the position of the first depth range in the target well is positioned in a fault;
the second acquisition module is used for acquiring the minimum distance between the position of the first depth range and the fault when the position of the first depth range in the target well is not positioned in the fault;
a second determining module, configured to determine whether the target well satisfies a second condition, where the second condition includes: the minimum distance is smaller than a second preset distance, or the position of the first depth range is located in the fault;
the third determination module is used for determining a plurality of first reference wells which are at distances from the target well less than the first preset distance when the target well meets the second condition.
Optionally, the apparatus for determining a casing damage factor further comprises:
the fourth detection module is used for detecting whether the position of the first depth range in the target well is located in a sand layer;
a fifth determining module, configured to determine a second reference well when the first depth range is located in the sand layer, where sand control operation is performed in the first depth range in the second reference well, a distance between the second reference well and the target well is smaller than a third preset distance, and extension directions of the second reference well and the target well in the first depth range are the same;
a third judging module, configured to judge whether a portion of the casing in the second reference well within the first depth range is damaged;
the fourth judging module is used for judging whether the stress borne by the target casing at the damaged position in the first depth range is greater than the buckling strength threshold of the target casing when the part, positioned in the first depth range, of the casing in the second reference well is damaged;
a sixth determining module, configured to determine a damage factor of the target casing when a portion of the casing in the second reference well in which the sand control operation is performed is not damaged and a portion of the casing in the target well in which the sand control operation is not performed is damaged or when the target casing is subjected to a stress greater than a buckling strength threshold of the target casing at a damaged position in the first depth range, where the stress is greater than the buckling strength threshold of the target casing, includes: sand production factor.
Optionally, the apparatus for determining a casing damage factor further comprises:
the fifth detection module is used for detecting whether a part, positioned in the first depth range, in the inner pipe of the target well is corroded;
a seventh determining module for determining a damage factor of the target casing when a portion of the inner pipe located within the first depth range is corroded, comprising: and (4) corrosion factors.
The beneficial effect that technical scheme that this application provided brought includes at least: according to the method for determining the casing damage factors, provided by the embodiment of the invention, the depth of the damage position of the casing in the well is determined firstly, then whether the depth of the damage position meets a first condition or not is detected, the stress on the damage position of the casing is detected, and when the detected stress on the damage position of the casing is greater than the casing buckling strength threshold value, the damage factors of the casing including mudstone hydration can be determined.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a cross-sectional view of a well according to one embodiment of the present invention;
FIG. 2 is a flow chart of a casing damage factor determination method according to an embodiment of the present invention;
FIG. 3 is a flow chart of another casing damage factor determination method provided by embodiments of the present invention;
FIG. 4 is a flow chart of another casing damage factor determination method provided by an embodiment of the invention;
FIG. 5 is a flow chart of yet another casing damage factor determination method provided by an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a casing damage factor determining apparatus according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of another casing damage factor determination device provided by an embodiment of the invention;
FIG. 8 is a schematic structural diagram of another apparatus for determining casing damage factors according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a device for determining a casing damage factor according to another embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
In the production of oil or gas, it is often necessary to drill a well in the formation. And as shown in fig. 1, each well is typically provided with a cement pipe inside which a casing pipe is sleeved, the casing pipe being sleeved with an inner pipe, the inner pipe being used for transporting oil or gas. In addition, before drilling a well in the stratum, the distribution of the rock stratum in the stratum can be detected by a resistivity detection method, and a stratum profile of the rock stratum distribution in the stratum is drawn; after the well drilling in the stratum is completed, the well trajectory in the stratum can be obtained by carrying out inclination measurement on the drilled well, and then a well track diagram is drawn.
The casing is easy to damage in the process of producing oil or natural gas, and the damage of the casing can influence the normal production of the oil or natural gas, so the embodiment of the invention provides a method for determining the damage factor of the casing, so that the casing can be maintained according to the damage factor of the casing.
Fig. 2 is a flowchart of a casing damage factor determination method according to an embodiment of the present invention. As shown in fig. 2, the casing damage factor determination method may include:
When a target casing in a target well is damaged, a measuring tool (such as a depth micrometer) can be used for measuring the distance between the damaged position of the casing and the ground surface, and then a first depth range of the damaged position in the target casing in the target well is determined.
The first condition includes: the position of the first depth range in the target well is located in the mudstone layer, and a water flow channel is formed between the cement pipe sleeved outside the target sleeve and the mudstone layer. Optionally, it may be detected whether the first depth range within the target well is located in the mudstone layer by combining the borehole trajectory map and the stratigraphic profile. Wherein the mudstone layer is formed by solidified clay.
It should be noted that the formation also includes a water layer. Water in the water layer can flow into a mud rock layer in the first depth range in the target well along the outer side of the cement pipe, and the clay in the mud rock layer can be hydrated and expanded after contacting with the water and generates expansion stress under the constraint of the formation pressure and the overburden pressure, and the expansion stress acts on the cement pipe. When the expansion stress that the cement pipe received is greater than the stress that the cement pipe can bear, the cement pipe takes place to damage, and at this moment, the expansion stress that produces after the clay in the mud rock stratum meets water directly acts on the sleeve pipe.
And 103, acquiring a buckling strength threshold value of the target casing and stress applied to the target casing at the breakage position within the first depth range. Step 104 is performed.
After determining that the target well satisfies the first condition, a buckling strength threshold of the target casing may be further obtained. Damage to the cannula may occur when the cannula is subjected to a force greater than the cannula buckling strength threshold. Additionally, the stress at the failure location of the target casing within the first depth range may be detected using a stress measurement tool.
And 104, judging whether the stress applied to the damaged position of the target casing in the first depth range is greater than the buckling strength threshold of the target casing. If the stress on the target casing breakage position is larger than the casing buckling strength threshold value, executing a step 105; if the stress on the target casing breakage position is not greater than the casing buckling strength threshold, step 106 is executed.
And 105, determining damage factors of the target casing, including mudstone hydration factors.
When the stress applied to the damaged position of the target casing in the first depth range is greater than the buckling strength threshold value of the target casing, the anti-extrusion strength of the target casing is considered to be insufficient to balance the stress at the damaged position of the target casing, and at the moment, the target casing may be damaged by diameter shrinkage, bending and the like under the action of the average stress, so that the damage factor of the target casing can be determined to comprise a mudstone hydration factor.
And 106, determining that the damage factor of the target casing does not include a mudstone hydration factor.
When the stress suffered by the target casing at the breakage position in the first depth range is not greater than the buckling strength threshold value of the target casing, the anti-extrusion strength of the target casing can be considered to be enough to balance the stress at the breakage position of the target casing, so that the breakage factor of the target casing can be determined to not include the mudstone hydration factor.
In summary, in the method for determining casing damage factors provided by the embodiment of the present invention, the depth of the damaged position of the casing in the well is first determined, then whether the depth of the damaged position meets the first condition is detected, and the stress applied to the damaged position of the casing is detected, and when the detected stress applied to the damaged position of the casing is greater than the casing buckling strength threshold, it may be determined that the damage factors of the casing include mudstone hydration.
In addition, in the related art, the damage factor of the casing usually needs to be comprehensively analyzed from the field data, the damage mechanism of the casing is researched, and tracking and operation verification are performed on the field, that is, the damage factor of the casing can be determined only after the damage condition of the casing is comprehensively mastered, so that the determination of the damage factor of the casing is relatively complex. In the method for determining casing damage factors provided by the embodiment of the invention, the casing damage factors can be determined only according to some data (such as the depth of the casing damage position, the stress at the casing damage position and the like) which are easy to obtain, so that the method for determining the casing damage factors is simpler.
Fig. 3 is a flowchart of another casing damage factor determination method according to an embodiment of the present invention. As shown in fig. 3, the casing damage factor determination method may include:
Optionally, in combination with the borehole trajectory map and the stratigraphic profile, it may be detected whether the first depth range within the target well is located at a fault, i.e. whether the damaged location of the target casing is located at a fault.
And 202, acquiring the minimum distance between the first depth range and the fault. Step 203 is performed.
Optionally, when the first depth range in the target well is not located at the fault, the minimum distance from the fault at which the first depth range is located may be measured through the borehole trajectory map and the stratigraphic profile.
And step 203, judging whether the target well meets a second condition. If the target well meets the second condition, executing step 204; if the target well does not satisfy the second condition, step 207 is performed.
The second condition includes: the first depth range is located at a minimum distance from the fault that is less than a second predetermined distance, or the first depth range within the target well is located at the fault. Wherein, the second preset distance in step 203 may be 100 meters. Illustratively, when the first depth range within the target well is 1010-1013 meters and the distance from the surface near the target well in the fault to the surface is 950 meters, it can be obtained that the first depth range is located at a minimum distance of 60 meters from the fault, since 60 meters is less than 100 meters, i.e. the target well satisfies the second condition. In addition, when the first depth range is located at the fault, the target well also satisfies a second condition.
When the first depth range in the target well is 1127-1130 m and the surface of the fault near the target well is 950 m from the surface, it can be obtained that the first depth range is located at a minimum distance of 177 m from the fault, since 177 m is greater than 100 m, i.e. the target well does not satisfy the second condition. The target well may also be determined to satisfy the second condition when the first depth range is located at the fault.
And 204, determining a plurality of first reference wells with the distance to the target well being smaller than a first preset distance, wherein the extending directions of the first reference wells and the target well in a first depth range are consistent. Step 205 is performed.
Alternatively, the first preset distance may be 50 meters, 80 meters, 100 meters, or the like, which is not limited in this embodiment of the present invention. It should be noted that the target well may be a vertical well, a horizontal well, or other well with casing. Alternatively, the first reference well may be aligned with the extension direction of the target well within the first depth range, for example, when the target well is a vertical well, a vertical well having a distance from the target well less than a first preset distance may be selected as the first reference well.
Illustratively, since the influence distance of the fault is typically kilometers, and the distance of the first reference well from the target well is typically meters, it can be seen that the distance of the first reference well from the target well is much smaller than the influence distance of the fault, and therefore whether the damage factor of the target casing includes the fault factor can be determined by detecting the damage condition of the portion of the casing within the first reference well that is located within the first depth range.
When a first depth range in the target well is located at a fault (or the minimum distance between the first depth range and the fault is less than a second preset distance), and all parts, located in the first depth range, of the casings in a plurality of first reference wells, the distances between the parts and the target well are less than the first preset distance, are damaged, the damage factor of the target casing can be considered to comprise a fault factor.
That is, since the target casing is stressed by the fault, the target casing is not strong enough to resist the stress applied to the target casing by the fault, so that the target casing is damaged by shrinkage, bending, and the like under the stress, and thus, it can be determined that the damage factor of the target casing includes the fault factor.
When the minimum distance between the casing in the first reference wells and the fault is larger than the second preset distance, or the parts of the casings in the first reference wells, which are less than the first preset distance away from the target well, are not damaged uniformly, the damage factor of the target casing is considered not to include the fault factor.
Fig. 4 is a flowchart of another casing damage factor determination method according to an embodiment of the present invention. As shown in fig. 4, the casing damage factor determination method may include:
Wherein the sand layer is formed by cementing various sand grains. In step 301, in conjunction with the borehole trajectory map and the stratigraphic profile, it may be detected whether a first depth range within the target well is located in a sand layer.
And 302, when the first depth range is located in the sand layer, determining a second reference well, performing sand control operation in the first depth range in the second reference well, wherein the distance between the second reference well and the target well is smaller than a third preset distance, and the extending directions of the second reference well and the target well in the first depth range are consistent. Step 303 is performed.
For example, the target well may be an oil well, a natural gas well, or a well with casing for producing other energy sources, which is not limited by the embodiments of the present invention. The second reference well may be the same as the first reference well, and optionally, the second reference well may also be different from the first reference well, which is not limited by the comparison in the embodiment of the present invention. The sand control operation may be chemical sand control or mechanical sand control back out of the formation to the surface.
Step 305 is performed when sand control operations are performed within the first depth range in the casing in the second reference well, and portions of the casing in the second reference well within the first depth range are undamaged, and sand control operations are not performed within the first depth range in the casing in the target well. Step 304 is performed when the sand control operation is performed within the first depth range in the casing in the second reference well and damage is present in the portion of the casing within the first depth range in the second reference well.
Because the distance between the second reference well and the target well is smaller than the third preset distance, whether the damage factor of the casing of the target well comprises the sand production factor can be judged according to the damage condition of the casing in the third reference well in the first depth range. When the part of the second reference well in the first depth range is subjected to sand control operation and the part is not damaged, the damage factor of the target well can be judged to comprise a sand production factor. However, when the part of the second reference well in the first depth range is subjected to sand control operation and the part is damaged, the judgment needs to be further made according to the stress applied to the part.
And 304, judging whether the stress applied to the damaged position of the target casing in the first depth range is larger than the buckling strength threshold of the target casing.
When the target casing is subjected to a stress at the breakage position within the first depth range, which is greater than the buckling strength threshold of the target casing, executing step 305; when the target cannula is not stressed at the failure location within the first depth range above the buckling strength threshold of the target cannula, step 306 is performed.
When the first depth range of the target well is located in a sand layer, sand control operation is performed on a second reference well which is away from the target well by a distance smaller than a third preset distance, and the part of a casing in the second reference well, which is located in the first depth range, is not damaged, and the part of the casing in the target well, which is located in the first depth range, is damaged, or the stress applied to the damaged position of the target casing in the first depth range is larger than the buckling strength threshold value of the target casing, it can be considered that the sand control operation is not performed on the part of the target casing in the first depth range, and sand is seriously generated at the position of the target casing in the first depth range, so that the anti-extrusion strength of the target casing is not enough to balance the stress applied to the damaged position of the target casing, and therefore, the damage factor of the target casing can be considered to include a sand generation factor.
When the first depth range of the target well is not located in a sand layer, or the stress on the damaged position of the target casing in the first depth range is not larger than the buckling strength threshold value of the target casing, the anti-extrusion strength of the target casing can be considered to be enough to balance the stress on the damaged position of the target casing, and then the damage factor of the target casing can be considered to not include a sand production factor.
Fig. 5 is a flowchart of another casing damage factor determination method according to an embodiment of the present invention. As shown in fig. 5, the casing damage factor determination method may include:
It should be noted that, the casing in the well is sleeved outside the inner pipe, and both the casing and the inner pipe are made of metal materials, so that when the inner pipe in the well is replaced, whether the damage factor of the casing includes the corrosion factor can be judged by detecting whether the part of the surface of the inner pipe, which is located in the first depth range, is corroded.
When a portion of the inner tubular in the target well within the first depth range is eroded, a damage factor of the target casing may be determined to include an erosion factor.
That is, since the target casing is made of metal, the metal is reduced in thickness and reduced in strength when it is corroded. When the target casing is corroded, the thickness of the target casing is reduced and the strength is reduced. When the compressive strength of the target casing is insufficient to balance the stress at the damaged portion of the target casing, the target casing may be damaged by fracture, bending, or the like, and thus it may be determined that the damage factor of the target casing includes a corrosion factor.
When the portion of the inner pipe located within the first depth range is not corroded, it may be determined that the damage factor of the target casing does not include a corrosion factor.
In the embodiment of the invention, whether the damage factor of the target casing comprises the corrosion factor can be determined by checking whether the part of the inner pipe of the target casing, which is positioned at the first depth range, is corroded.
Optionally, while checking whether a portion of the inner tube of the target casing at the first depth range is corroded, it may also check whether a portion of the inner tubes of a plurality of third reference wells having a distance from the target well less than a fourth preset distance at the first depth range is corroded. If the inner pipe of the target casing and the inner pipe of the third reference well at which the first depth range is located are both corroded, it may be determined that the damage factor of the casing includes a corrosion factor; if the portions of the inner tube of the target casing and the inner tube of the third reference well at the first depth range are not both corroded, it may be determined that the damage factor of the casing does not include a corrosion factor.
Optionally, the fourth preset distance may be 50 meters, 80 meters, 100 meters, or the like, which is not limited in this embodiment of the present invention.
In the embodiment of the invention, whether the damage factors of the target casing include mudstone hydration factors or not can be judged through the steps 101 to 105; whether the damage factors of the target casing include fault factors can be judged through the steps 201 to 207; whether the damage factor of the target casing includes a sand factor can be judged through steps 301 to 305; it is also possible to judge whether the damage factor of the target casing includes the corrosion factor through steps 401 to 403. That is, the embodiment of the present invention may determine whether the damage factors to the target casing include: judging the hydration factor, fault factor, sand factor and corrosion factor of the mudstone. It should be noted that the order of judging the mudstone hydration factor, the fault factor, the sand production factor and the corrosion factor can be adjusted, which is not limited in the embodiment of the present invention.
Optionally, the rock hydration factor, the fault factor and the sand production factor all belong to physical factors, the corrosion factor belongs to chemical factors, and before the mud rock hydration factor, the fault factor, the sand production factor and the corrosion factor are judged, whether the service life of the target casing reaches a preset time (for example, 10 years or 11 years and the like) can also be judged. When the service life of the target casing reaches the preset time, it can be determined that the service life of the target casing is longer, and at the moment, the factors of damage of the target casing possibly include chemical factors, so that the chemical factors can be preferentially judged, and then the physical factors are judged. When the service life of the target casing does not reach the preset time, it can be determined that the service life of the target casing is short, and at this time, the factor of damage of the target casing is unlikely to include a chemical factor, so that the judgment of the chemical factor is not needed, and the judgment of the physical factor is directly performed.
In summary, in the method for determining casing damage factors provided by the embodiment of the present invention, the depth of the damaged position of the casing in the well is first determined, then whether the depth of the damaged position meets the first condition is detected, and the stress applied to the damaged position of the casing is detected, and when the detected stress applied to the damaged position of the casing is greater than the casing buckling strength threshold, it may be determined that the damage factors of the casing include mudstone hydration.
Fig. 6 is a schematic structural diagram of a casing damage factor determination apparatus according to an embodiment of the present invention. As shown in fig. 6, the casing damage factor determination device 50 includes:
a first determining module 501 for determining a first depth range of a damage location in a target casing within a target well;
a first detection module 502 for detecting whether a target well satisfies a first condition, the first condition comprising: the position of the first depth range in the target well is located in a mud rock layer, and a water flow channel is formed between a cement pipe sleeved outside the target sleeve and the mud rock layer;
a first obtaining module 503, configured to obtain a buckling strength threshold of the target casing and a stress experienced by the target casing in a first depth range when the target well meets a first condition;
the first judging module 504 is configured to judge whether stress applied to a damaged position of the target casing within a first depth range is greater than a buckling strength threshold of the target casing;
the second determination module 505 is configured to determine the damage factor of the target casing when the stress applied to the target casing at the damaged position within the first depth range is greater than the buckling strength threshold of the target casing, including: mudstone hydration factors.
In summary, in the method for determining casing damage factors provided by the embodiment of the present invention, the depth of the damaged position of the casing in the well is first determined, then whether the depth of the damaged position meets the first condition is detected, and the stress applied to the damaged position of the casing is detected, and when the detected stress applied to the damaged position of the casing is greater than the casing buckling strength threshold, it may be determined that the damage factors of the casing include mudstone hydration.
Optionally, fig. 7 is a schematic structural diagram of another apparatus for determining a casing damage factor according to an embodiment of the present invention. As shown in fig. 7, on the basis of fig. 6, the casing damage factor determination apparatus 60 further includes:
a third determining module 604, configured to determine a plurality of first reference wells that are located at a distance smaller than a first preset distance from the target well, where the first reference wells and the target well have a same extending direction within a first depth range;
a second detection module 605 for detecting whether a portion of the casing within the first depth range within each first reference well is damaged;
a fourth determination module 606 for determining a damage factor for the target casing when all of the portions of the casings in the first depth range within the first plurality of reference wells are damaged, comprising: fault factors.
Optionally, the apparatus for determining a casing damage factor shown in fig. 7 further includes:
the third detection module 601 is configured to detect whether the position of the first depth range in the target well is located in a fault;
a second obtaining module 602, configured to obtain a minimum distance between a fault and a location of the first depth range in the target well when the location of the first depth range is not located in the fault;
a second determining module 603, configured to determine whether the target well satisfies a second condition, where the second condition includes: the minimum distance is smaller than a second preset distance, or the first depth range is located in a fault;
the third determination module 604 is configured to determine a plurality of first reference wells that are less than a first predetermined distance from the target well when the target well satisfies a second condition.
Optionally, fig. 8 is a schematic structural diagram of another apparatus for determining a casing damage factor according to an embodiment of the present invention. As shown in fig. 8, on the basis of fig. 6, the casing damage factor determination apparatus 60 further includes:
the fourth detection module 701 is used for detecting whether the position of the first depth range in the target well is located in a sand layer;
a fifth determining module 702, configured to determine a second reference well when the first depth range is located in the sand layer, where the sand control operation is performed within the first depth range in the second reference well, a distance between the second reference well and the target well is smaller than a third preset distance, and extension directions of the second reference well and the target well within the first depth range are the same;
a third determining module 703, configured to determine whether a portion of the casing in the second reference well within the first depth range is damaged;
a fourth judging module 704, configured to, when a part of the casing in the second reference well, which is located in the first depth range, is damaged, judge whether a stress applied to a damaged position of the target casing in the first depth range is greater than a buckling strength threshold of the target casing;
a sixth determining module 705, configured to determine a damage factor of the target casing when a portion of the casing in the second reference well in which the sand control operation is performed is not damaged and a portion of the casing in the target well in which the sand control operation is not performed is damaged, or when a stress applied to the target casing at a damaged position in the first depth range is greater than a buckling strength threshold of the target casing, includes: sand production factor.
Optionally, fig. 9 is a schematic structural diagram of a device for determining a casing damage factor according to another embodiment of the present invention. As shown in fig. 9, on the basis of fig. 6, the casing damage factor determination apparatus 60 further includes:
a fifth detection module 801, configured to detect whether a portion of the inner tube of the target well, which is located within the first depth range, is corroded;
a seventh determining module 802 for determining a damage factor of the target casing when a portion of the inner tube within the first depth range is corroded includes: and (4) corrosion factors.
In summary, in the method for determining casing damage factors provided by the embodiment of the present invention, the depth of the damaged position of the casing in the well is first determined, then whether the depth of the damaged position meets the first condition is detected, and the stress applied to the damaged position of the casing is detected, and when the detected stress applied to the damaged position of the casing is greater than the casing buckling strength threshold, it may be determined that the damage factors of the casing include mudstone hydration.
It should be noted that, the method embodiment provided in the embodiment of the present invention can be mutually referred to a corresponding apparatus embodiment, and the embodiment of the present invention does not limit this. The sequence of the steps of the method embodiments provided by the embodiments of the present invention can be appropriately adjusted, and the steps can be correspondingly increased or decreased according to the situation, and any method that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention shall be covered by the protection scope of the present invention, and therefore, the detailed description thereof shall not be repeated.
The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A casing damage factor determination method, wherein a target casing to be tested is located in a target well, the method comprising:
determining a first depth range within the target well for a location of a damage in the target casing;
detecting whether the target well satisfies a first condition, the first condition comprising: the position of the first depth range in the target well is located in a mud rock stratum, and a water flow channel is formed between a cement pipe sleeved outside the target sleeve and the mud rock stratum;
when the target well meets the first condition, acquiring a buckling strength threshold value of the target casing and stress applied to a breakage position of the target casing in the first depth range;
judging whether the stress applied to the damaged position of the target casing in the first depth range is greater than the buckling strength threshold of the target casing;
determining a failure factor for the target cannula when the target cannula is subjected to a stress greater than a buckling strength threshold of the target cannula at a failure location within the first depth range comprises: mudstone hydration factors.
2. The method of claim 1, further comprising:
determining a plurality of first reference wells which are at a distance smaller than a first preset distance from the target well, wherein the first reference wells and the target well are consistent in extending direction within the first depth range;
detecting whether a portion of the casing within each first reference well within the first depth range is damaged;
determining a damage factor for the target casing when all of the portions of the casings within the first depth range within the first plurality of reference wells are damaged comprises: fault factors.
3. The method of claim 2, wherein prior to the determining a plurality of first reference wells having a distance from the target well less than a first preset distance, the method further comprises:
detecting whether the first depth range in the target well is located in a fault;
when the first depth range in the target well is not located in the fault, acquiring the minimum distance between the first depth range and the fault;
determining whether the target well satisfies a second condition, the second condition comprising: the minimum distance is smaller than a second preset distance, or the position of the first depth range is located in the fault;
the determining a plurality of first reference wells having a distance to the target well less than a first preset distance comprises: determining a plurality of first reference wells having a distance to the target well less than the first preset distance when the target well satisfies the second condition.
4. The method of claim 1, further comprising:
detecting whether the first depth range in the target well is located in a sand layer;
when the first depth range is located in the sand layer, determining a second reference well, performing sand control operation in the first depth range in the second reference well, wherein the distance between the second reference well and the target well is smaller than a third preset distance, and the extension directions of the second reference well and the target well in the first depth range are consistent;
determining whether a portion of the casing within the second reference well within the first depth range is damaged;
when the part of the casing in the second reference well, which is positioned in the first depth range, is damaged, judging whether the stress applied to the target casing at the damaged position in the first depth range is greater than the buckling strength threshold of the target casing;
determining a failure factor of the target casing when a portion of the casing in the second reference well in which the sand control operation was performed is undamaged and a portion of the casing in the target well in which the sand control operation was not performed is damaged, or when the target casing is subjected to a stress greater than a buckling strength threshold of the target casing at a damaged position in the first depth range, comprises: sand production factor.
5. The method of claim 1, further comprising:
detecting whether a portion of an inner tube of the target well within the first depth range is corroded;
determining a damage factor of the target casing when a portion of the inner tube within the first depth range is corroded comprises: and (4) corrosion factors.
6. A casing damage factor determination apparatus, wherein a target casing to be tested is located in a target well, the casing damage factor determination apparatus comprising:
a first determination module to determine a first depth range within the target well of a damage location in the target casing;
a first detection module to detect whether the target well satisfies a first condition, the first condition comprising: the position of the first depth range in the target well is located in a mud rock stratum, and a water flow channel is formed between a cement pipe sleeved outside the target sleeve and the mud rock stratum;
the first obtaining module is used for obtaining a buckling strength threshold value of the target casing and stress applied to a damaged position of the target casing in the first depth range when the target well meets the first condition;
the first judging module is used for judging whether the stress applied to the damaged position of the target casing in the first depth range is larger than the buckling strength threshold of the target casing;
a second determination module for determining a failure factor of the target cannula when the target cannula is stressed at the failure location within the first depth range above a buckling strength threshold of the target cannula, comprising: mudstone hydration factors.
7. The casing damage factor determination apparatus as defined in claim 6, further comprising:
a third determination module, configured to determine a plurality of first reference wells that are located at a distance from the target well that is less than a first preset distance, where the first reference wells and the target well have a same extending direction within the first depth range;
a second detection module for detecting whether a portion of the casing within each first reference well within the first depth range is damaged;
a fourth determination module to determine a damage factor for the target casing when all of the portions of the casings within the first depth range within the first plurality of reference wells are damaged, comprising: fault factors.
8. The casing damage factor determination apparatus as defined in claim 7, further comprising:
the third detection module is used for detecting whether the position of the first depth range in the target well is positioned in a fault;
the second acquisition module is used for acquiring the minimum distance between the position of the first depth range and the fault when the position of the first depth range in the target well is not positioned in the fault;
a second determining module, configured to determine whether the target well satisfies a second condition, where the second condition includes: the minimum distance is smaller than a second preset distance, or the position of the first depth range is located in the fault;
the third determination module is used for determining a plurality of first reference wells which are at distances from the target well less than the first preset distance when the target well meets the second condition.
9. The casing damage factor determination apparatus as defined in claim 6, further comprising:
the fourth detection module is used for detecting whether the position of the first depth range in the target well is located in a sand layer;
a fifth determining module, configured to determine a second reference well when the first depth range is located in the sand layer, where sand control operation is performed in the first depth range in the second reference well, a distance between the second reference well and the target well is smaller than a third preset distance, and extension directions of the second reference well and the target well in the first depth range are the same;
a third judging module, configured to judge whether a portion of the casing in the second reference well within the first depth range is damaged;
the fourth judging module is used for judging whether the stress borne by the target casing at the damaged position in the first depth range is greater than the buckling strength threshold of the target casing when the part, positioned in the first depth range, of the casing in the second reference well is damaged;
a sixth determining module, configured to determine a damage factor of the target casing when a portion of the casing in the second reference well in which the sand control operation is performed is not damaged and a portion of the casing in the target well in which the sand control operation is not performed is damaged or when the target casing is subjected to a stress greater than a buckling strength threshold of the target casing at a damaged position in the first depth range, where the stress is greater than the buckling strength threshold of the target casing, includes: sand production factor.
10. The casing damage factor determination apparatus as defined in claim 6, further comprising:
the fifth detection module is used for detecting whether a part, positioned in the first depth range, in the inner pipe of the target well is corroded;
a seventh determining module for determining a damage factor of the target casing when a portion of the inner pipe located within the first depth range is corroded, comprising: and (4) corrosion factors.
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| CN201811147835.4A CN110965990A (en) | 2018-09-29 | 2018-09-29 | Casing damage factor determination method and device |
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