CN110941866B - Annulus cement slurry interface design method based on well cementation big data - Google Patents
Annulus cement slurry interface design method based on well cementation big data Download PDFInfo
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Abstract
The invention provides an annulus cement slurry interface design method based on well cementation big data, which comprises the following steps: collecting well cementation big data of all wells in a research area; setting a screening condition based on the well cementation big data, screening the annular cement paste interface condition of the completed well meeting the condition, and obtaining an annular cement paste interface design rule through data analysis; collecting the drilling and logging data of the starting time after the starting time of the well to be designed is finished; and determining the type and the interface position of the well cementing cement slurry of the well to be designed according to the annular cement slurry interface design rule and the drilling and logging data. The design method provided by the invention has the advantages that the annular cement slurry interface designed by mining and analyzing the big data of the well cementation annular cement slurry interface and comprehensively considering the actual drilling condition of the well is more scientific and reasonable, and the sealing quality can be better ensured.
Description
Technical Field
The invention belongs to the technical field of oil and gas field well cementation operation, and particularly relates to an annulus cement slurry interface design method based on well cementation big data.
Background
In the well cementation operation process of the oil-gas well, whether effective packing of an oil-gas water layer can be realized or not, and the design of a well cementation annulus cement slurry interface plays a key role. At present, the design of the annular cement slurry interface is mainly designed by engineering designers according to personal experience and design specifications, the design method of the well cementation annular cement slurry interface is severely limited by personal ability and cognitive level of the designers, especially the design of the annular cement slurry interface of a complex well, a special well and the like under a complex underground condition needs the engineering personnel with rich experience and strong personal ability to design, otherwise, the design level and sealing quality of the well cementation can be seriously affected by the misdesign of the cement slurry interface, and serious complex well cementation risks such as well cementation leakage and gas channeling can be caused. Therefore, how to realize reasonable design of a cement slurry interface of the well cementation annulus is very important to realize effective sealing of the well cementation annulus.
Disclosure of Invention
In view of the deficiencies in the prior art, it is an object of the present invention to address one or more of the problems in the prior art as set forth above. For example, one of the objectives of the present invention is to provide an annulus cement slurry interface design method that can avoid influencing the level of cementing design and the quality of cementing due to human factors.
In order to achieve the above object, the present invention provides an annulus cement slurry interface design method based on well cementation big data, which may include the following steps: collecting well cementation big data of all wells in a research area; setting a screening condition based on the well cementation big data, screening the annular cement slurry interface condition of the completed well meeting the condition, and obtaining an annular cement slurry interface design rule through data analysis; collecting the drilling and logging data of the starting time after the starting time of the well to be designed is finished; and determining the type and the interface position of the well cementing cement slurry of the well to be designed according to the annular cement slurry interface design rule and the drilling and logging data.
In an exemplary embodiment of the annulus cement slurry interface design method based on the well cementation big data, the well cementation big data may include drilling and logging data of each time of opening all wells in a research area, well cementation design data of each time of opening all wells in the research area, electrical well cementation quality data of each time of opening all wells in the research area, and construction report data of each time of opening all wells in the research area.
In an exemplary embodiment of the annulus cement slurry interface design method based on well cementation big data, the screening condition may include one or more of a well cementation mode, an electrical well cementation quality, a displacement efficiency, a block configuration, a geographical position, a drill bit size and a length of a sealing section. Further, the setting of the screening condition comprises setting of the electric logging cementing quality to be not less than 60% and the displacement efficiency to be not less than 90%.
In an exemplary embodiment of the annulus cement interface design method based on well cementation big data, the annulus cement interface design rules may include the rules of cement paste type, interface position, sealing layer position and sealing oil-gas-water leakage layer. Further, the obtaining of the annular cement slurry interface design rule through data analysis includes: screening out the condition of the types of the cement paste of the completed well meeting the conditions, and selecting the type of the cement paste in all the wells with the most types as a rule of the types of the cement paste; screening out the interface positions of the wells which meet the conditions and are completed, and rejecting the interface positions with larger numerical value difference to obtain an interface position rule; and screening the sealing position and the sealing oil-gas-water leakage layer of the completed well according with the conditions, and respectively selecting the most sealing positions and the most sealing oil-gas-water leakage layers in all wells as a sealing position rule and a sealing oil-gas-water leakage layer rule. Further, the determining the type and the interface position of the well cementing cement slurry of the well to be designed comprises: determining the type of well cementing cement paste of a well to be designed according to the type rule of the cement paste; obtaining a well body structure, stratum layering, stratum lithology, oil-gas-water display, well leakage display and a special stratum of the well to be designed according to the drilling and logging data of the drill hole after the drill hole of the well to be designed is finished; and combining the obtained cement paste interface design rule with the drilling and logging data to obtain an interface position. Further, the determining of the interface position includes: and calculating the average value of the distances from different interface positions of each well in the finished well to the gas invasion display layer or the well leakage and oil gas display layer, and adding or subtracting the position of the gas invasion display layer or the well leakage and oil gas display layer of the well to be designed and the average value to obtain the interface position of the current time of the well to be designed.
In an exemplary embodiment of the annulus cement slurry interface design method based on well cementation big data, the well logging data can comprise well structure, stratum layering, lithology, oil and gas display, well leakage and special stratum.
In an exemplary embodiment of the annulus cement slurry interface design method based on well cementation big data, the basic information of the well to be designed may include well bore structure, oil, gas and water display, formation lithology and lost circulation display.
Compared with the prior art, the invention has the beneficial effects that:
(1) The design method provided by the invention has the advantages that through the large data mining analysis of the well cementation annulus cement slurry interface, the designed annulus cement slurry interface is comprehensively considered in combination with the actual drilling condition of the well, so that the design method is more scientific and reasonable, and the sealing quality can be better guaranteed;
(2) The design method of the invention effectively avoids the complex condition of well cementation caused by uneven design quality of cement slurry interfaces due to the personal capability of designers.
Drawings
The above and other objects and features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:
FIG. 1 shows a flow diagram of a cementing big data based annulus cement slurry interface design method according to an exemplary embodiment of the present invention;
FIG. 2 shows a flow chart of annular cement slurry interface design rules obtained by analyzing well cementation big data according to an exemplary embodiment of the present invention.
Detailed Description
Hereinafter, an annulus cement slurry interface design method based on cementing big data according to the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.
The invention provides an annulus cement slurry interface design method based on well cementation big data. In an exemplary embodiment of the annulus cement slurry interface design method based on the well cementation big data, as shown in fig. 1, an annulus cement slurry interface design result including determination of the type of cement slurry and the position of a cement slurry interface is obtained by combining well drilling and logging data to be designed, including a well structure, stratum layering, stratum lithology, oil-gas-water display, well leakage display and a special bottom layer, with a cement slurry interface design rule obtained through analysis. The design method may include the steps of:
and S01, collecting well cementation big data of all wells in the research area.
And collecting the drilling and logging data of all wells of the research area, the well cementation design data of all wells of each opening, the electrical logging well cementation quality data of all wells of each opening and the construction report data of all wells of each opening.
S02, analyzing the well cementation big data, setting screening conditions to screen out the cement paste interface condition of the completed well according with the conditions, and obtaining an annular cement paste interface design rule through data screening, mining and analyzing.
In the above, the set screening condition may include one or more of setting of a cementing pattern, electrical measurement of cementing quality, displacement efficiency, block configuration, geographical location, drill bit size, and length of a cementing section. The set screening conditions should be matched with the actual field conditions of the well to be designed. In the process of setting the screening condition, basic information conditions of the well to be designed need to be considered, for example, basic information such as a well body structure, oil, gas and water, a stratum, well leakage and the like of the well to be designed need to be considered. Furthermore, in order to better reflect the design rule of the annular cement slurry interface, the set screening conditions can be two or more. Specifically, the set cementing mode can be set according to the conditions of a cementing material, cementing equipment and the like used in the cementing process of the well to be designed. For example, the cementing method may be liner cementing, inner string cementing, and the like. For the electric logging cementing quality, the electric logging cementing quality should be above 60% of the minimum requirement of the electric logging cementing quality, and for example, the fixed quality can be set to be not less than 80%. In order to achieve better displacement effect, the set displacement efficiency condition may be greater than 90%, for example, the displacement efficiency may be set greater than 92%. Of course, the efficiency of the replacement may be set to other values, so as to meet the minimum expected value of the designer. The block configuration, geographical location and bit size may be set according to the block configuration, geographical location and bit size used at or near the actual location of the well to be planned. The length of the sealing section can be determined according to the actual well bore condition of the well to be designed. For example, the length of the seal segment may be selected from 2500m to 3500 m.
Further, the design rule of the annulus cement slurry interface can comprise the rule of determining the type of cement slurry, the interface position, the sealing position and the sealing oil-gas-water leakage layer. For example, as shown in fig. 2, for big well cementation data of a completed well, screening conditions including drill bit size, block structure, geographic position, well cementation mode, well cementation quality, displacement efficiency and length of a sealing section are set, and a cement slurry interface design rule including cement slurry type, interface position, a sealing layer position and a sealing oil-gas-water leakage layer is obtained. Specifically, the data screening mining analysis may include: and screening out the cement paste types, interface positions, sealing positions and sealing oil-gas-water leakage layers of all wells in the research area, wherein the cement paste types, the interface positions, the sealing positions and the sealing oil-gas-water leakage layers accord with the set conditions. And in the screened wells, the annular cement slurry interface design rule is adopted according to the cement slurry types, the interface positions, the sealing layer positions and the sealing oil-gas-water leakage layers of a plurality of wells. For example, the types of cement slurries used in the selected wells may be different depending on the set selection conditions, and the rule may be that the types of the cement slurries used are selected and the number of the types of the cement slurries used is large. For example, 10 wells are screened, wherein two kinds of cement paste are adopted for 3 wells, and three kinds of cement paste are adopted for 7 wells, so that the types of the cement paste are regulated to be three kinds of cement paste. The interface location may be a range value, and the data range in the set of interface locations for the screened wells may be taken as a rule. When the interface position rule is determined, numerical values with larger position difference can be excluded to obtain numerical values with more concentrated numerical values. The specific range of the phase difference can be determined according to actual well cementation conditions such as a well hole of a well to be designed, a well cementation tool and the like. For example, for two cement slurries, delayed setting and rapid setting are included. In 5 wells, the slow-setting interface and the fast-setting interface are used for sealing a certain position A of a well bottom section, and the position of the position A is provided with gas invasion display, wherein the position of the slow-setting interface and the fast-setting interface of a first well is 20m above the gas invasion display, the position of the slow-setting interface and the fast-setting interface of a second well is 100m above the gas invasion display, the position of the slow-setting interface and the fast-setting interface of a third well is 110m above the gas invasion display, the position of the slow-setting interface and the fast-setting interface of a fourth well is 115m above the gas invasion display, and the position of the slow-setting interface and the fast-setting interface of a fifth well is 160m above the gas invasion display. For example, the interface position distances of each completed well can be sorted, and the minimum value and the maximum value are removed to obtain an interface position rule. The well that sealing position and sealing oil gas water leakage layer can be screened seals position and the condition of sealing oil gas water leakage layer, selects the many as the law of the number of layers of sealing position and sealing oil gas water leakage layer.
And S03, after the design well is drilled for the time, collecting the drilling and logging data of the time.
The well logging data may include well bore structure, formation layering, formation lithology, oil, gas, water display, lost circulation display, and special formations.
And S04, determining the type and the interface position of the well cementing cement slurry of the well to be designed according to the annular cement slurry interface design rule and the collected drilling and logging data.
And finally determining the type and the interface position of the cementing cement slurry of the designed well by combining the drilling and logging data of the current time of the well to be designed based on the cement slurry interface big data analysis design rule.
Specifically, the type of the well cementation cement slurry can be used as the type of the cement slurry of the designed well according to the cement slurry type rule obtained in S02. And obtaining the well body structure, stratum layering, stratum lithology, oil-gas-water display, well leakage display and special stratum of the well to be designed according to the drilling and logging data of the drill hole collected after the drill hole of the well to be designed is finished. The design rule obtained in S02 is obtained by taking basic information (well body structure, oil-gas-water, stratum, lost circulation and the like) of the well to be designed as basic conditions, the obtained well body structure, stratum layering, stratum lithology, oil-gas-water display, lost circulation display and special stratum information of the current well to be designed are combined with the annular cement slurry interface design rule to determine the interface position, namely the obtained design rule is matched with the basic information of the well to be designed, and the design rule can be applied to the cement slurry design of the well to be designed. In the process of determining the interface position, the average value of the distances from different interface positions of each well in the completed well to the gas invasion display layer or the well leakage and oil gas display layer can be calculated, and the position of the gas invasion display layer or the position of the well leakage and oil gas display layer of the well to be designed is added or subtracted with the average value to obtain the interface position of the well to be designed at the current time. For example, three cement slurries (setting retarding, setting and setting fast) are set for a well to be designed, and n wells are screened, wherein the setting and setting fast interface position of each well is at a distance L from a gas layer (above a gas invasion display) i I =1,2, 3.. Times.n, resulting in an average distance L = ∑ L i And/n. According to the drilling and logging data of the drill book to be designed, drillingAnd when the gas invasion is displayed at the p meter position, the position of the coagulation and quick-drying interface in the well to be designed can be p-L meters. The similar calculation is performed for the interfaces between slow coagulation and intermediate coagulation. As another example, three cement slurries (setting retarding, setting and setting fast) are set for a well to be designed, and n wells are screened, wherein the setting and setting fast interface position of each well is separated from the gas layer by a distance L i I =1,2, 3.., n, in all n wells, the position of the coagulation and fast drying interface in each well is not much different from the gas layer distance, and in all the distances, the minimum distance is L m M is equal to i, and the maximum distance is L k K ∈ i, the average value may be L = (L) m +L k )/2. And according to the drilling and logging data of the current time of the well to be designed, displaying gas invasion at the position of drilling to p meters, wherein the coagulation and quick-drying interface position in the well to be designed can be p-L meters. The same way of calculating the interface between slow coagulation and intermediate coagulation can be used.
In order that the above-described exemplary embodiments of the invention may be better understood, further description thereof with reference to specific examples is provided below.
In the western Sichuan area, a certain drill bit of a high-pressure gas well with the size of 241.3mm is drilled to 7366m, a tail pipe with the size of 184.15mm is adopted to suspend cementing and sealing 3800-7366 m, and the design method of a cementing annulus cement slurry interface comprises the following steps:
step 1, well cementation big data preparation.
And collecting all the completed well drilling and logging data, well cementation design data, electric well cementation quality data and construction report data of the block structure or the adjacent block structure to form well cementation big data.
And 2, analyzing big data of the cement paste interface.
1) Setting screening conditions: selecting several items from a cementing mode, an electrical logging cementing quality, a displacement efficiency, a structure, a geographic position and a drill bit size as conditions.
A well cementation mode: cementing a tail pipe;
the size of the drill bit is as follows: 241.3mm;
block construction: a certain structure in Sichuan;
electrically logging the well cementation quality: 80 percent;
replacement efficiency: 90 percent;
the length of the sealing section is as follows: 3000m.
2) The method comprises the following steps of obtaining a well cementation annulus cement slurry interface design rule that the dimension of a certain open-time drill bit of a certain structure in Sichuan is 241.3mm, the length of a tail pipe well cementation sealing section is more than 3000m, the quality of electric logging well cementation is more than 80%, and the displacement efficiency is more than 90% through data mining analysis: 3 kinds of cement slurry (slow setting, medium setting and quick drying), medium setting and quick drying interface according to the shaft bottom 600-800m seal the bottom of the well a certain horizon A, horizon A has gas invasion display (according to the screening condition, select from the gas invasion above the display 200 m-260 m), slow setting and medium setting interface from hang position 500-800m seal the upper well section horizon B has well leakage and oil gas display (according to the screening condition, select from the well leakage horizon 50 m-100 m).
Step 3, collecting drilling and logging data: collecting the logging information (well body structure, stratum layering, lithology, oil gas display, well leakage and special stratum) of 241.3mm of bit size of a certain well, sealing 0-3985 m of the well, displaying gas invasion at a position A of 6800m of the drill at the time of drilling, and displaying well leakage at a position B of 4500m of the well depth.
Step 4, cement paste interface design: based on the cement slurry interface design rule based on the well cementation big data obtained in the step two, the drilling and logging data of the current time are obtained in the step 3, and it is determined that three cement slurries (retarding, intermediate setting and quick drying) are adopted in the current time, the intermediate setting and quick drying interface is 6570m (6800- (200 + 260)/2), and the retarding and intermediate setting interface is 4575m (4500 + (50 + 100)/2).
In conclusion, the annular cement slurry interface designed by comprehensively considering the actual drilling condition of the well is more scientific and reasonable through large data mining analysis of the well cementation annular cement slurry interface, and the sealing quality can be better ensured; the design method of the invention effectively avoids the complex condition of well cementation caused by uneven design quality of cement slurry interfaces due to the personal capability of designers.
Although the present invention has been described above in connection with exemplary embodiments, it will be apparent to those skilled in the art that various modifications and changes may be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. An annulus cement slurry interface design method based on well cementation big data is characterized by comprising the following steps:
collecting well cementation big data of all wells in a research area;
setting a screening condition according to basic information of a well to be designed and based on the well cementation big data, screening the condition of an annular cement slurry interface of a finished well meeting the condition, and obtaining an annular cement slurry interface design rule through data analysis;
collecting the drilling and logging data of the starting time after the starting time of the well to be designed is finished;
determining the type and the interface position of well cementing cement slurry of a well to be designed according to an annular cement slurry interface design rule and drilling and logging data;
the well cementation big data comprises well drilling and logging data of all wells in a research area in each opening time, well cementation design data of all wells in the research area in each opening time, electric logging well cementation quality data of all wells in the research area in each opening time and construction report data of all wells in the research area in each opening time;
the screening condition comprises one or more than two of a well cementation mode, an electric measurement well cementation quality, a displacement efficiency, a block structure, a geographical position, a drill bit size and a sealing section length;
the annular cement interface design rule comprises the rules of cement types, interface positions, sealing positions and sealing oil-gas-water leakage layers;
the well drilling and logging data comprise a well body structure, stratum layering, stratum lithology, oil gas water display, well leakage display and special stratum.
2. The annulus cement slurry interface design method based on well cementation big data as claimed in claim 1, wherein the set screening conditions include the set electrical well cementation quality not less than 60% and the replacement efficiency not less than 90%.
3. The annulus cement slurry interface design method based on well cementation big data as claimed in claim 1, wherein the obtaining of the annulus cement slurry interface design rule through data analysis comprises:
screening out the types of the cement slurry of the completed well which meet the conditions, and selecting the cement slurry type which is most used in all the wells as the rule of the cement slurry type;
screening out the interface positions of the wells which meet the conditions and are completed, and rejecting the interface positions with larger numerical value difference to obtain an interface position rule;
and screening the sealing position and the sealing oil-gas-water leakage layer of the completed well according with the conditions, and respectively selecting the most sealing positions and the most sealing oil-gas-water leakage layers in all wells as a sealing position rule and a sealing oil-gas-water leakage layer rule.
4. The annulus cement slurry interface design method based on well cementation big data as claimed in claim 3, wherein the determining the well cementation cement slurry type and the interface position of the well to be designed comprises:
determining the type of well cementation cement slurry of a well to be designed according to the cement slurry type rule;
obtaining a well body structure, stratum layering, stratum lithology, oil-gas-water display, well leakage display and a special stratum of the well to be designed according to the drilling and logging data of the drill hole after the drill hole of the well to be designed is finished;
and combining the obtained annular cement slurry interface design rule with the drilling and logging data to obtain an interface position.
5. The annulus cement slurry interface design method based on well cementation big data as claimed in claim 4, wherein the determination of the interface position comprises: and calculating the average value of the distance between each well interface position in the completed well and the gas invasion display layer or the well leakage and oil gas display layer, and adding or subtracting the position of the gas invasion display layer or the well leakage and oil gas display layer of the well to be designed and the average value to obtain the interface position of the current time of the well to be designed.
6. The annulus cement slurry interface design method based on well cementation big data as claimed in claim 1, wherein the basic information of the well to be designed includes well bore structure, oil gas water display, formation lithology and lost circulation display.
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