CN113914814A - Anti-collapse sand consolidation drilling and grinding treatment method for ultra-deep open hole well - Google Patents
Anti-collapse sand consolidation drilling and grinding treatment method for ultra-deep open hole well Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 81
- 238000000227 grinding Methods 0.000 title claims abstract description 67
- 238000007596 consolidation process Methods 0.000 title claims abstract description 28
- 238000005406 washing Methods 0.000 claims abstract description 40
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- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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- E—FIXED CONSTRUCTIONS
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- 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
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- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
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Abstract
The invention discloses a collapse-preventing sand consolidation drilling and grinding treatment method for an ultra-deep open hole well, which comprises the following steps of: analyzing the position of the easily collapsed well section according to the logging data about the well to be processed; processing the falling blocks of the well section which is easy to collapse; squeezing nanometer cement into the well section which is easy to collapse so as to stabilize the well wall and fill cracks at the position which is easy to collapse; and in the well section which is easy to collapse, a drilling and grinding tool is adopted to be matched with the mud for drilling and grinding treatment. According to the invention, through comprehensive treatment of sand consolidation and sand prevention, the sand washing treatment efficiency is improved, the drilling blocking risk is reduced, the problem of secondary collapse in the later period is avoided, the process technology is mature, the operability is strong, and the effect is obvious.
Description
Technical Field
The invention relates to the technical field of oil reservoir exploitation, in particular to a collapse-preventing sand consolidation drilling and grinding treatment method for an ultra-deep open hole well.
Background
The main exploitation layer of the tower river oil field is an Ordovician carbonate reservoir, the whole oil reservoir is buried deep at 5400-7000m, the completion is mainly carried out in an open hole mode, and the length of the open hole section is 80-300 m. Wherein 67 percent of the oil is reformed and produced by acid fracturing, the measures of increasing production and injection such as water injection, gas injection and the like are mainly adopted in the later period, and simultaneously, the deep pumping process is gradually expanded and applied along with the development process of the oil reservoir. Due to multiple influences of special oil reservoir geological conditions and an exploitation process, an oil well reservoir layer is subjected to frequent sand burying, the sand burying proportion of the oil well to the collapse reaches 45.9%, the sand burying depth reaches 200m, and 67% of oil wells have repeated sand burying phenomena. Because the average construction period of the sand washing operation well is 42 days, the average single-well operation cost reaches 180 ten thousand yuan, and the oil reservoir development benefit is seriously influenced by the collapse sand burying of the ultra-deep open hole well.
The collapse of the well wall is one of the important factors for restricting the yield increase, and the shortage of treatment means also brings great pressure to the integrity, production cost and benefit of the well. At present, the existing borehole wall collapse treatment technology mainly has the following problems: 1. the efficiency is low, and the open hole section collapses repeatedly during sand washing, which mainly shows that sand returns out from an outlet during the sand washing, but the sand surface of the repeated sand detection of the marquis sediment is high, so that the sand washing operation is repeated; 2. the risk is large, the well bore is expanded after the collapse due to frequent collapse during sand washing, rock debris cannot return out during sand washing, and drilling accidents are often caused due to the influence of collapse during sand washing, so that the drilling construction safety is seriously influenced; 3. the effective period is short, the production is satisfied at that time after the collapse is processed to reach the target horizon, however, the well section which is easy to collapse in the production period collapses again, the production is influenced again, and 60% of oil wells have sand burying phenomena of repeated collapse.
Therefore, aiming at the current situation that the collapse sand burying situation of the ultra-deep open hole well is increasingly severe, an effective collapse treatment process technical method is urgently needed to be designed to achieve the dual functions of prevention and treatment.
Disclosure of Invention
In order to solve the technical problem, an embodiment of the present invention provides an anti-collapse sand consolidation drilling and grinding processing method for an ultra-deep open hole well, including: analyzing the position of the easily collapsed well section according to the logging data about the well to be processed; processing the falling blocks of the easily collapsed well section; extruding nano cement into the easily collapsed well section to stabilize the well wall and fill cracks at the easily collapsed position; and in the well section which is easy to collapse, drilling and grinding are carried out by adopting a drilling and grinding tool to match with the mud.
Preferably, the step of processing the fallen pieces of the easily collapsible well section comprises: determining lithology of surrounding rock of the collapsible well section; and according to the lithology, a small-size sand washing tool is put in, and the falling blocks of the well section which is easy to collapse are processed, so that the well section is exposed.
Preferably, in the step of processing the fallen blocks of the easily collapsed well section, the method further comprises: and collecting the returned sand sample and judging the collapse position in the easily collapsed well section.
Preferably, in the step of performing rapid drilling and grinding treatment on the easily collapsed well section by using a drilling and grinding tool in combination with mud, the method comprises the following steps: and carrying out rapid drilling and grinding treatment on the collapsed position, wherein the drilling and grinding tool is preferably a roller bit.
Preferably, the small size sand wash tool is preferably a drill pipe beveled tip.
Preferably, the breakthrough pressure of the nano cement is greater than or equal to 1.7 MPa/cm; and the particle size of the nano cement is less than or equal to 20 nm; and the effective period of the nano cement is more than 1 year.
Preferably, after the rapid drilling and grinding process is completed, the method further comprises: and (3) putting the aluminum alloy drilling and grinding sand control screen pipe into the well to be treated so as to avoid later-stage repeated collapse.
Preferably, in the step of injecting nano cement into the collapse prone well section to stabilize the well wall and fill the cracks at the collapse prone position, the method comprises the following steps: and (3) extruding the nano cement in a pressure building and coagulation waiting mode.
Preferably, in the step of analyzing the location of the collapsible interval based on well log data about the well to be treated, comprises: and predicting the collapse sand burying phenomenon of the well to be treated, and determining the depth range corresponding to the prediction result as the well section easy to collapse.
Preferably, rock lithology characteristics around each well section of the well to be processed are analyzed according to the logging data of the well to be processed and geological data of an oil field area where the well to be processed is located; determining the stress distribution characteristics of each well section of the well to be processed according to the analysis result of the collapse phenomenon response factors of the open hole well section, the logging information of the well to be processed and the historical sand washing condition of the well to be processed; and comparing the lithology characteristics of the rock with the stress distribution characteristics according to the well depth position, and determining the well section easy to collapse according to the comparison result.
Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:
the invention provides a collapse-preventing sand consolidation drilling and grinding treatment method for an ultra-deep open hole well. The method comprises the following steps: analyzing the specific position of the easily collapsed well section by combining the logging information and the historical sand washing condition; a small-size sand washing tool is used for processing the position of the easily collapsed well, and the easily collapsed well section is exposed; performing cement squeezing construction on the easily collapsed well section to stabilize the well wall and simultaneously relieve the leakage problem; performing anti-collapse rapid drilling and grinding treatment on the position which is easy to collapse by using a high-efficiency drilling and grinding tool matched with mud; and (4) putting the drillable aluminum alloy screen pipe easy to drill and grind. The invention forms a set of novel technical method suitable for sand burying treatment of frequent collapse of the ultra-deep open hole, adopts a comprehensive treatment means of sand consolidation and sand prevention, improves the sand washing treatment efficiency, reduces the risk of drill sticking, effectively avoids the problem of secondary collapse in the later period, has mature process technology, strong operability and obvious effect, and has the prospect and benefit of field popularization and application.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
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 step diagram of a collapse prevention sand consolidation drilling and grinding treatment method for an ultra-deep open hole well according to an embodiment of the application.
Fig. 2 is a specific flowchart of a collapse prevention sand consolidation drilling and grinding treatment method for an ultra-deep open hole well according to an embodiment of the present application.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented. It should be noted that, as long as there is no conflict, the embodiments and the features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are within the scope of the present invention.
Additionally, the steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
The main exploitation layer of the tower river oil field is an Ordovician carbonate reservoir, the whole oil reservoir is buried deep at 5400-7000m, the completion is mainly carried out in an open hole mode, and the length of the open hole section is 80-300 m. Wherein 67 percent of the oil is reformed and produced by acid fracturing, the measures of increasing production and injection such as water injection, gas injection and the like are mainly adopted in the later period, and simultaneously, the deep pumping process is gradually expanded and applied along with the development process of the oil reservoir. Due to multiple influences of special oil reservoir geological conditions and an exploitation process, an oil well reservoir layer is subjected to frequent sand burying, the sand burying proportion of the oil well to the collapse reaches 45.9%, the sand burying depth reaches 200m, and 67% of oil wells have repeated sand burying phenomena. Because the average construction period of the sand washing operation well is 42 days, the average single-well operation cost reaches 180 ten thousand yuan, and the oil reservoir development benefit is seriously influenced by the collapse sand burying of the ultra-deep open hole well.
The collapse of the well wall is one of the important factors for restricting the yield increase, and the shortage of treatment means also brings great pressure to the integrity, production cost and benefit of the well. At present, the existing borehole wall collapse treatment technology mainly has the following problems: 1. the efficiency is low, and the open hole section collapses repeatedly during sand washing, which mainly shows that sand returns out from an outlet during the sand washing, but the sand surface of the repeated sand detection of the marquis sediment is high, so that the sand washing operation is repeated; 2. the risk is large, the well bore is expanded after the collapse due to frequent collapse during sand washing, rock debris cannot return out during sand washing, and drilling accidents are often caused due to the influence of collapse during sand washing, so that the drilling construction safety is seriously influenced; 3. the effective period is short, the production is satisfied at that time after the collapse is processed to reach the target horizon, however, the well section which is easy to collapse in the production period collapses again, the production is influenced again, and 60% of oil wells have sand burying phenomena of repeated collapse.
Therefore, aiming at the current situation that the collapse sand burying situation of the ultra-deep open hole well is increasingly severe, an effective collapse treatment process technical method is urgently needed to be designed to achieve the dual functions of prevention and treatment.
In order to solve the technical problem, the invention provides a collapse-preventing sand consolidation drilling and grinding treatment method for an ultra-deep open hole well. The method comprises the steps of firstly, monitoring the borehole wall collapse phenomenon of a well to be processed in real time, and determining an open-hole well section (a well section easy to collapse) which is easy to generate the borehole wall collapse phenomenon and a corresponding well section depth range; then, treating the well section which is easy to collapse and injecting high-strength nano cement to ensure that the rock which has undergone stress change is cemented again, stabilizing the well wall and filling cracks around the well section, and reducing the leakage; and in the well section which is easy to collapse, a drilling and grinding tool is adopted to be matched with the mud for rapid drilling and grinding treatment, so that the anti-collapse sand consolidation treatment aiming at the current easy collapse is completed. Therefore, the invention forms a set of solid sand drilling and grinding treatment technical method aiming at the open hole well without borehole wall collapse or the sand buried well which has frequently collapsed, provides a new technical direction for the borehole wall collapse treatment of the ultra-deep carbonate rock stratum, can achieve the dual functions of prevention and treatment, is already applied on site, and obtains the expected good effect.
Example one
Fig. 1 is a step diagram of a collapse prevention sand consolidation drilling and grinding treatment method for an ultra-deep open hole well according to an embodiment of the application. The steps of the anti-collapse sand consolidation drilling and grinding treatment method according to the present invention will be described with reference to fig. 1.
Step S110, analyzing the position of the easily collapsed well section of the current well to be processed according to the logging data of the current well to be processed. In embodiments of the invention, the well to be treated is an ultra-deep open hole well in the production phase of the oilfield region. In the practical application process, the well to be treated may be an open hole well without collapse and sand burying phenomena, and the anti-collapse sand consolidation drilling and grinding treatment technology needs to be implemented on the depth position of the easy-collapse well section of the open hole well; the method can also be used for the open hole wells with the collapsed sand burying phenomena, and the anti-collapse sand consolidation drilling and grinding treatment technology is required to be implemented on the depth positions of the easy-to-collapse well sections of the open hole wells (the easy-to-collapse well sections of the open hole wells are well sections which are collapsed). Therefore, the anti-collapse sand consolidation drilling and grinding treatment technology applied to the easily collapsed well section in the well to be treated can achieve multiple effects of preventing, treating and treating the collapsed sand burying phenomenon.
When the easily-collapsed well section of the current well to be processed is determined, predicting the oil well collapse sand burying phenomenon of the current well to be processed, and determining the depth range corresponding to the predicted well section with the sand burying phenomenon to be collapsed as the easily-collapsed well section.
In the practical application process, after an oil well is operated along with drilling, acid fracturing, well completion, water injection, oil extraction and measures, the formation pressure can be greatly changed, the pressure balance in the oil well can be damaged, the redistribution of rock stress around the well hole can be undoubtedly caused, the redistributed stress can be called as the hoop stress, the radial stress and the axial stress of the well hole, if the comprehensive influence of the redistributed stress exceeds the strength of the rock or cannot balance the original formation stress, the well wall can be caused to be unstable, the well wall is caused to collapse (the sand burying phenomenon of the collapse of the oil well), the productivity of the current oil well is influenced, and the follow-up fishing, testing, layer changing and other various engineering operations are not facilitated.
In the embodiment of the invention, when the sand burying phenomenon of the collapse of the oil well is predicted, firstly, the rock lithology characteristics of the current well to be processed around each well section are analyzed according to the logging data of the current well to be processed and the geological data of the oil field area where the current well to be processed is located, and lithology data (such as rock strength or original stratum stress) capable of representing the rock lithology characteristics of the positions at different depths in the well are obtained. And then, analyzing collapse phenomenon response factors of the current open hole well section to be processed, for example, analyzing the well diameter of the well to be processed, the sign during sand washing, rock samples returned by sand washing and the like, and judging whether various factors of repeated collapse phenomena exist. And then, according to the analysis result of the current open hole section collapse phenomenon response factors, the logging information of the current well to be processed and the historical sand washing conditions (such as the cumulative times of sand washing construction, the completion effect of sand washing construction and the like) of the current well to be processed, determining the distribution characteristics of the open hole stress (wherein the stress comprises but is not limited to circumferential stress, radial stress and axial stress) of each well section of the current well to be processed, and obtaining the stress distribution information capable of representing all the stresses of the open holes at different underground depth positions. And finally, according to the well depth position, transversely comparing the lithology data (rock lithology characteristics at different underground depth positions) with the stress distribution characteristic information (all stresses of the open hole well at different underground depth positions) to determine the well section depth position range in which the collapse and sand burying phenomena are easy to occur. In this way, the determination process for the position of the collapse prone well section is completed, and the process proceeds to step S120.
Step S120 performs a flushing process on the fallen blocks of the easy-to-collapse well section determined in step S110. In the practical application process, firstly, the lithology characteristics of rocks around the current easy-to-collapse open hole well section need to be determined; and then, according to the current lithology characteristics, a small-size sand washing tool is put in, so that the falling blocks of the current easily-collapsed well section are thoroughly treated (washed), and the current easily-collapsed well section is exposed. In the embodiment of the invention, a small-size sand washing tool is adopted to avoid the blocking and the clamping of the drill. The small-size sand washing tool is preferably a drill rod inclined tip, so that the drill clamping can be prevented, the rotary processing capacity of the block falling processing process can be improved, the block falling processing is more thorough, and the processing efficiency is improved.
Meanwhile, during the dropping process in step S120, the sand samples that are returned from the wellhead are collected, and the (easily) collapsed layer in the current easily collapsed well section is determined. In the block falling processing process, the sand samples discharged back in the flushing processing are compared with the sand samples of all the layers collected in the logging interpretation process, so that the easily collapsed layers with smaller depth range in the depth range of the easily collapsed well section are reversely pushed out, and the easily collapsed layers are directly and accurately processed in the subsequent drilling and grinding processing.
After the block dropping process is completed, the process proceeds to step S130. Step S130, nanometer cement is squeezed into the current easily-collapsed well section to stabilize the well wall and fill cracks at the corresponding easily-collapsed positions. In step S130, high-strength nano cement slurry is squeezed into the current open hole well section that is prone to collapse through a cement slurry squeezing process technology, and the rock in the well section that is prone to collapse and has stress changes is re-cemented by the nano cement slurry, so that the well wall is stabilized, and collapse or repeated collapse is avoided; meanwhile, by means of a cement paste extruding process technology, the extruded nano cement paste is used for filling cracks in the easily collapsed well section, namely, crack channels are plugged, the stratum leakage amount during sand washing is reduced, effective circulation of working fluid can be established, the sand washing operation effect is improved, and underground accidents are avoided.
In the embodiment of the invention, the properties of the nano cement meet the following conditions: the breakthrough pressure of the nano cement is more than or equal to 1.7MPa/cm, the particle size of the nano cement is less than or equal to 20nm, and the effective period of the nano cement is more than 1 year.
Furthermore, when the embodiment of the invention is used for cement squeezing construction, the nano cement meeting the performance conditions needs to be squeezed into the current easily-collapsed well section in a pressure building and coagulation waiting manner, so as to effectively balance the external pressure in the open hole well, and further improve the cementing strength.
In the process of performing the squeeze cement construction operation on the easily collapsible well section in the step S130, the step S140 is further required to perform a rapid drilling and grinding process on the easily collapsible layer in the easily collapsible well section, so that the sand consolidation drilling and grinding process technology is completed under the cooperation of the step S130 and the step S140.
And step S140, in the current easily collapsed well section, performing rapid drilling and grinding treatment by adopting a drilling and grinding tool in cooperation with the squeezed mud. Specifically, in step S140, an efficient drilling and grinding tool is required to be used, and further, in cooperation with the squeezed slurry, the current collapse-prone position determined in step S120 is subjected to rapid anti-collapse drilling and grinding processing. In embodiments of the present invention, the high efficiency drilling and grinding tool is preferably a roller cone drill bit. Therefore, when the high-efficiency drilling and grinding tool is matched with mud to perform anti-collapse rapid drilling and grinding treatment on the target layer, the stability of the tool face of the drill bit is enhanced, and the regularity of the borehole can be further ensured.
Example two
Based on the first embodiment, the invention further provides another embodiment of the collapse-prevention sand consolidation drilling and grinding treatment method for the ultra-deep open hole well. Fig. 2 is a specific flowchart of a collapse prevention sand consolidation drilling and grinding treatment method for an ultra-deep open hole well according to an embodiment of the present application. The anti-collapse sand consolidation drilling and grinding processing method in this embodiment will be described with reference to fig. 2.
Referring to fig. 2, first, step S201 analyzes the location of a vulnerable wellbore section from log data regarding a well to be treated. Then, step S202 processes the dropped blocks of the current vulnerable well section. Next, step S203 extrudes nano cement into the current easy-to-collapse well section to stabilize the well wall and fill the cracks at the corresponding easy-to-collapse positions. And step 203, in real time, step 204, in the easily collapsed well section, performing drilling and grinding treatment by adopting a drilling and grinding tool and matching with mud. It should be noted that, in this embodiment, step S201 is implemented by the same method as step S110, step S202 is implemented by the same method as step S120, step S203 is implemented by the same method as step S130, and step S204 is implemented by the same method as step S140, so detailed descriptions of the implementation processes of steps S201 to 204 are omitted here.
Further, in order to protect the sand consolidation processing performed in steps S201 to S204 and avoid repeated collapse in the later period, in this embodiment, step S205 is further included.
Step S205, an aluminum alloy drilling and grinding sand control screen pipe (column) is put into a producing zone in the well to be treated so as to avoid repeated collapse in the later period. The aluminum alloy drilling and grinding sand prevention screen pipe column is a production layer suspension sand prevention technology, on one hand, the technology can effectively support an open hole well wall, and on the other hand, a screen pipe is used for blocking large-particle stratum sand, and a sand blocking barrier is formed by piling up between the well wall and the annular space of the screen pipe, so that the effect of preventing stratum sand from generating is achieved; on the other hand, the drilling and grinding treatment of later-stage operation such as open hole sidetracking or deepening is facilitated; meanwhile, the material has strong corrosion resistance, and is convenient for implementing yield increasing measures (acidification and acid fracturing) in the later period; and the sand washing and bailing operation can be carried out in the pipe, and the well wall is supported, so that the risk of sand washing and drill sticking caused by secondary collapse of the well wall is avoided.
Further, the aluminum alloy drilling and grinding sand prevention screen pipe column body is formed by processing an aluminum alloy material, the aluminum alloy material has the characteristics of light weight, high strength, easiness in drilling and grinding, dissolvability, strong acid resistance and high potential besides the characteristics of meeting the conditions of high temperature, high pressure, high salt and high hydrogen sulfide content of an oil well, and the aluminum alloy drilling and grinding sand prevention screen pipe column hanger is adopted in the embodiment of the invention, so that the sealing performance of a tool is improved and the service life of the tool is prolonged aiming at the problems of difficult drilling and grinding and poor sealing performance of a conventional casing hanger.
Therefore, the aluminum alloy screen pipe easy to drill and grind is arranged in the step S205, and the later repeated collapse phenomenon is effectively avoided for a long time.
The collapse prevention sand consolidation drilling and grinding treatment method for the ultra-deep open hole well, which is described in the embodiment, is applied to the first ultra-deep open hole well, and the conditions before and after the open hole well is implemented are described as follows:
the well was drilled completely in 2 months and 4 days of 2012, the well was drilled completely to a depth of 6228m, at-drilled level O1-2y, T74 (reservoir depth): 6058m, no emptying and leakage in the drilling process, production is carried out by adopting an acid fracturing well completion mode, sand burying at the bottom of a well is found after pumping for 4 months, sand washing and acidification operations are carried out in the upper repair operation, the bottom sand burying is detected for 150m, drilling blocking accidents occur for many times in the period, fish falls are formed, the sand washing operation cannot be carried out to the bottom of the well for 5 times in an accumulated mode due to serious leakage in the treatment period, 3 months are spent, 210 ten thousand of expenses are consumed, and 800 tons of output is influenced. The sand burial that collapses once more is discovered in 2018 in 4 months, and aiming at the problem that the well frequently collapses and is seriously leaked, the operation adopts a sand consolidation drilling and grinding treatment technology, the well wall is stabilized through cement squeezing, a drillable sand control screen pipe is put in a matched mode, no drilling blocking and leakage phenomena occur during the treatment period, the well is treated to the bottom of the well once, the well is stably produced at present, the sand burial that collapses once more is effectively avoided, the operation cost is saved, and the yield loss is reduced.
The collapse prevention sand consolidation drilling and grinding treatment method for the ultra-deep open hole well, which is described in the embodiment, is applied to the second ultra-deep open hole well, and the conditions before and after the open hole well is implemented are described as follows:
the well is drilled in 21 days 4 months 4 in 2014, the drilling completion well depth is 5950m, and the drilling completion layer position is as follows: o1-2y, T74 (reservoir depth): 5871.5m, depth of hill entry: 78.5m, no emptying and leakage during the drilling and completion, production is put into operation by adopting an acid fracturing well completion mode, repeated acid fracturing is repaired in 8 months in 2017, the reservoir collapses and sand is buried for 62m, and the sand washing treatment difficulty is high due to the irregular well wall of the well, so that 320 ten thousand yuan of accumulated cost is consumed by using a Venturi sand bailing process and a sand bailing pump process, and the aim is not fulfilled at all. The sand-fixing drilling and grinding treatment technology is applied in the operation, no drilling clamping phenomenon occurs after cement squeezing treatment, the drilling and grinding anti-collapse sieve tube is put into the bottom after one-time treatment, and stable production is realized at present.
The embodiment of the invention provides a collapse-preventing sand consolidation drilling and grinding treatment method for an ultra-deep open hole well. The method comprises the following steps: analyzing the specific position of the easily collapsed well section by combining the logging information and the historical sand washing condition; a small-size sand washing tool is used for processing the position of the easily collapsed well, and the easily collapsed well section is exposed; performing cement squeezing construction on the easily collapsed well section to stabilize the well wall and simultaneously relieve the leakage problem; performing anti-collapse rapid drilling and grinding treatment on the position which is easy to collapse by using a high-efficiency drilling and grinding tool matched with mud; and (4) putting the drillable aluminum alloy screen pipe easy to drill and grind. The invention forms a set of novel technical method suitable for sand burying treatment of frequent collapse of the ultra-deep open hole, adopts a comprehensive treatment means of sand consolidation and sand prevention, improves the sand washing treatment efficiency, reduces the risk of drill sticking, effectively avoids the problem of secondary collapse in the later period, has mature process technology, strong operability and obvious effect, and has the prospect and benefit of field popularization and application.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
It is to be understood that the disclosed embodiments of the invention are not limited to the particular structures, process steps, or materials disclosed herein but are extended to equivalents thereof as would be understood by those ordinarily skilled in the relevant arts. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting.
Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Thus, the appearances of the phrase "one embodiment" or "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.
Although the embodiments of the present invention have been described above, the above descriptions are only for the convenience of understanding the present invention, and are not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An anti-collapse sand consolidation drilling and grinding treatment method for an ultra-deep open hole well is characterized by comprising the following steps:
analyzing the position of the easily collapsed well section according to the logging data about the well to be processed;
processing the falling blocks of the easily collapsed well section;
extruding nano cement into the easily collapsed well section to stabilize the well wall and fill cracks at the easily collapsed position;
and in the well section which is easy to collapse, drilling and grinding are carried out by adopting a drilling and grinding tool to match with the mud.
2. The method of claim 1, wherein the step of processing the fallout of the collapsible interval comprises:
determining lithology of surrounding rock of the collapsible well section;
and according to the lithology, a small-size sand washing tool is put in, and the falling blocks of the well section which is easy to collapse are processed, so that the well section is exposed.
3. The method of claim 2, wherein in the step of processing the fallout of the collapsible interval, further comprising: and collecting the returned sand sample and judging the collapse position in the easily collapsed well section.
4. The method of claim 3, wherein in the step of performing a rapid drilling and grinding process using a drilling and grinding tool with mud in the collapsible well section, the step comprises:
and carrying out rapid drilling and grinding treatment on the collapsed position, wherein the drilling and grinding tool is preferably a roller bit.
5. A method according to any of claims 2 to 4, wherein the small size sand wash tool is preferably a drill pipe angle point.
6. The method according to any one of claims 1 to 5,
the breakthrough pressure of the nano cement is more than or equal to 1.7 MPa/cm; and
the particle size of the nano cement is less than or equal to 20 nm; and
the effective period of the nano cement is more than 1 year.
7. The method of claim 6, wherein after completing the rapid drilling process, the method further comprises: and (3) putting the aluminum alloy drilling and grinding sand control screen pipe into the well to be treated so as to avoid later-stage repeated collapse.
8. The method as claimed in any one of claims 1 to 7, wherein in the step of squeeze injecting nano cement into the collapse prone well section to stabilize the well wall and fill the cracks at the collapse prone position, the method comprises the following steps: and (3) extruding the nano cement in a pressure building and coagulation waiting mode.
9. A method according to any one of claims 1 to 8, wherein in the step of analysing the location of the collapsible interval from log data relating to the well to be treated, comprises:
and predicting the collapse sand burying phenomenon of the well to be treated, and determining the depth range corresponding to the prediction result as the well section easy to collapse.
10. The method of claim 9,
analyzing rock lithology characteristics around each well section of the well to be processed according to the logging data of the well to be processed and geological data of an oil field area where the well to be processed is located;
determining the stress distribution characteristics of each well section of the well to be processed according to the analysis result of the collapse phenomenon response factors of the open hole well section, the logging information of the well to be processed and the historical sand washing condition of the well to be processed;
and comparing the lithology characteristics of the rock with the stress distribution characteristics according to the well depth position, and determining the well section easy to collapse according to the comparison result.
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