CN112049628A - Method for judging and identifying oil-water interface of buried hill by using water content index - Google Patents
Method for judging and identifying oil-water interface of buried hill by using water content index Download PDFInfo
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- CN112049628A CN112049628A CN202011123166.4A CN202011123166A CN112049628A CN 112049628 A CN112049628 A CN 112049628A CN 202011123166 A CN202011123166 A CN 202011123166A CN 112049628 A CN112049628 A CN 112049628A
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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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- 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
Abstract
The invention discloses a method for judging and identifying a buried hill oil-water interface by using a water content index, which takes logging parameters in a drilling process as analysis objects, and divides the logging parameters into two types, wherein the first type represents that oil-containing sensitive parameters comprise a gas-logging full hydrocarbon value and a rock debris display level, and the second type represents that water-containing sensitive parameters comprise outlet conductivity, carbon dioxide content and drilling fluid chloride ion content; and (3) carrying out data processing and scientific fitting on the two types of parameters, combining the parameters with a drillability index reflecting the quality of the physical property of a stratum reservoir to form a method for judging and recognizing the oil-water interface of the buried hill by the water-containing index, and judging whether the oil-water interface is drilled by comparing the change of the water-containing index in the longitudinal direction with the change rule of the water-containing index in the region. The method well solves the problem of identifying the oil-water interface of the buried hill, and provides reliable technical support for well drilling depth and next measures.
Description
Technical Field
The invention relates to the technical field of logging engineering and hydrocarbon reservoir interpretation and evaluation, in particular to a method for identifying a buried hill oil-water interface by using a water content index.
Background
In recent years, with the continuous acquisition of new breakthroughs for the exploration of the buried hill hydrocarbon reservoir, the development of the buried hill hydrocarbon reservoir becomes a new field of oil and gas development, wherein the identification of fluid properties is a key point for evaluating a hydrocarbon reservoir, and the determination of an oil-water interface is one of difficult problems of the identification of the fluid properties. Currently, integrated logging is the predominant logging site service, whichThe recorded parameters are used as data sources, have strong representativeness and universality, reflect direct information of formation fluid and have the characteristic of intuition. According to the logging parameter response characteristics of reservoir water content, the real-time conductivity is summarized to judge the oil-water interface, the after-effect conductivity is summarized to judge the oil-water interface and CO2Judging oil-water interface, judging oil-water boundary, chloride ion and gas measurement component by oiliness index, and displaying the judged oil-water interface.
The conventional method is more intuitive to judge whether the stratum produces water or not. However, in actual work, the drilling fluid parameters are much slightly changed and can not be observed by naked eyes (carbon dioxide and conductivity), and the measurement distance of the chloride ions is large, so that the field requirements can not be completely met.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for identifying an oil-water interface of a buried hill by using a water content index.
In order to solve the technical problems, the invention adopts the technical scheme that: a method for identifying an oil-water interface of a buried hill by using a water content index comprises the following steps:
firstly, collecting logging-while-drilling parameters and debris oil gas display data of a well;
secondly, dividing the collected data into two types, wherein the first type represents oil-containing sensitive parameters, including gas logging total hydrocarbon and rock debris display levels; the second category represents water-sensitive parameters including outlet conductivity, carbon dioxide content, drilling fluid chloride ion content;
thirdly, processing the parameters classified in the second step
(1) Assigning the oil-containing grade of the rock debris representing the oil-containing sensitive parameter to a specific value, wherein the undisplayed value is 0.5, the fluorescence displayed value is 2, the oil stain displayed value is 4, and the oil stain displayed value is 8; the gas measurement total hydrocarbon value adopts a field actual measurement value;
(2) calculating a base value ratio of outlet conductivity, carbon dioxide content and drilling fluid chloride ion content which represent water-containing sensitive parameters, wherein the base value ratio of the conductivity is equal to the value of the conductivity minus the base value, and the value of the conductivity is multiplied by 100; the carbon dioxide base value ratio is equal to the value of carbon dioxide minus the base value, is compared with the value of carbon dioxide, and is multiplied by 100; the basic value ratio of the chloride ion content is equal to the value of the chloride ion content minus the basic value, and is multiplied by 100 after being compared with the value of the chloride ion content;
fourthly, calculating the drillability index of the well by using the logging engineering parameters, wherein the drillability index is derived from a Bingham formula, the value of the drillability index reflects the drillability of the reservoir, and the reservoir evaluation quantification is realized by the formula:
Kz＝dcn-dcz
wherein d iscz＝[lg(3.282B/(N·T))/lg(0.068W/D)]·ρw/ρce
In the formula, Kz-drillability index; dcz-the drillability of the formation; b-the coefficient of bit wear; n-bit speed, r/min; t-drilling time, min/m; w is weight on bit, kN; d is the diameter of the drill bit, m; rhow-formation water density, g/cm3；ρceCyclic equivalent Density, g/cm3；dcnDenotes dczD is calculated by establishing a trend value using the depth value as the abscissaczSelecting a certain section of stable two groups of coordinate values from a coordinate system with the value of ordinate, substituting the coordinate values into a formula y ═ ax + b, and solving a and b, wherein y represents dcn；
And step five, scientifically fitting the parameter data processed in the step three and the drillability index obtained in the step four to form a water content index:
in the formula, Ks-water cut index; kz-drillability index; t isg-total hydrocarbon content in the formation during drilling; d is the base value ratio of the conductivity; z-carbon dioxide base number ratio; l is the chloride ion base value ratio in the drilling fluid; y-containingOil grade;
and sixthly, judging whether the oil-water interface is drilled or not by comparing the change of the water content index in the longitudinal direction with the change rule of the water content index in the region.
And judging the oil-water interface by using a trend method and a longitudinal change rule of the water content index, wherein when the water content index shows an increasing trend, the water content degree of the reservoir is gradually increased, and the depth of the inflection point of the curve is used as the judging depth of the oil-water interface.
And the sixth step of establishing a numerical value judgment standard by adopting a numerical value method and according to the relation between the regional water content index and the oil-water interface judgment, and taking the appearance depth of the absolute numerical value as the oil-water interface judgment depth.
The invention has the beneficial effects that: the logging parameters are comprehensively utilized to make the most reasonable judgment on the oil-water interface, the most scientific drilling completion depth suggestion is provided for a builder, and the technical support is made for the improvement of the overall benefit of exploration and development.
Drawings
FIG. 1 is a schematic diagram of the present invention for identifying an oil-water interface by using a water cut index.
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description:
the method for judging and identifying the oil-water interface of the buried hill by using the water content index comprises the following steps of:
firstly, collecting logging-while-drilling parameters and debris oil gas display data of a well;
secondly, dividing the collected data into two types, wherein the first type represents oil-containing sensitive parameters, including gas logging total hydrocarbon and rock debris display levels; the second category represents water-sensitive parameters including outlet conductivity, carbon dioxide content, drilling fluid chloride ion content;
thirdly, processing the parameters classified in the second step
(1) Assigning the oil-containing grade of the rock debris representing the oil-containing sensitive parameter to a specific value, wherein the undisplayed value is 0.5, the fluorescence displayed value is 2, the oil stain displayed value is 4, and the oil stain displayed value is 8; the gas measurement total hydrocarbon value adopts a field actual measurement value;
(2) calculating a base value ratio of outlet conductivity, carbon dioxide content and drilling fluid chloride ion content which represent water-containing sensitive parameters, wherein the base value ratio of the conductivity is equal to the value of the conductivity minus the base value, and the value of the conductivity is multiplied by 100; the carbon dioxide base value ratio is equal to the value of carbon dioxide minus the base value, is compared with the value of carbon dioxide, and is multiplied by 100; the basic value ratio of the chloride ion content is equal to the value of the chloride ion content minus the basic value, and is multiplied by 100 after being compared with the value of the chloride ion content;
fourthly, calculating the drillability index of the well by using the logging engineering parameters, wherein the drillability index is derived from a Bingham formula, the value of the drillability index reflects the drillability of the reservoir, and the reservoir evaluation quantification is realized by the formula:
Kz＝dcn-dcz
wherein d iscz＝[lg(3.282B/(N·T))/lg(0.068W/D)]·ρw/ρce
In the formula, Kz-drillability index; dcz-the drillability of the formation; b-the coefficient of bit wear; n-bit speed, r/min; t-drilling time, min/m; w is weight on bit, kN; d is the diameter of the drill bit, m; rhow-formation water density, g/cm3；ρceCyclic equivalent Density, g/cm3；dcnDenotes dczD is calculated by establishing a trend value using the depth value as the abscissaczSelecting a certain section of stable two groups of coordinate values from a coordinate system with the value of ordinate, substituting the coordinate values into a formula y ═ ax + b, and solving a and b, wherein y represents dcn；
And step five, scientifically fitting the parameter data processed in the step three and the drillability index obtained in the step four to form a water content index:
in the formula, Ks-water cut index; kz-drillability index; t isgAll hydrocarbons in the formation during drillingValue content; d is the base value ratio of the conductivity; z-carbon dioxide base number ratio; l is the chloride ion base value ratio in the drilling fluid; y-oil grade;
and sixthly, judging whether the oil-water interface is drilled or not by comparing the change of the water content index in the longitudinal direction with the change rule of the water content index in the region.
And judging the oil-water interface by using a trend method and a longitudinal change rule of the water content index, wherein when the water content index shows an increasing trend, the water content degree of the reservoir is gradually increased, and the depth of the inflection point of the curve is used as the judging depth of the oil-water interface.
And the sixth step of establishing a numerical value judgment standard by adopting a numerical value method and according to the relation between the regional water content index and the oil-water interface judgment, and taking the appearance depth of the absolute numerical value as the oil-water interface judgment depth.
The meaning of the water-containing index formula indicates that a reservoir with certain physical properties is in existence, the property of the fluid depends on the display of rock debris, the height of a gas measurement value, a gas measurement component and a curve form, if the display level of the rock debris is higher and the gas measurement total hydrocarbon value is high, the fluid can fully fill the corresponding reservoir, and the fluid mainly comprises oil gas; however, if the opposite is true, the fluid may contain water, and as the fluid enters the drilling fluid after being broken up by the drill bit, it will tend to affect changes in logging parameters, such as CO2And the conductivity suddenly rises, and chloride ions rise, so that the oil-containing sensitive parameter is used as a denominator, the water-containing sensitive parameter is used as a numerator, the two terms are compared and multiplied by a drillability index which represents the physical property of a stratum reservoir, namely the water-containing index is obtained, and the higher the water-containing index is, the higher the possibility of water containing of the stratum is.
As the single logging data has limitation on water content judgment, the water content index is developed by scientifically fitting and innovating the gas logging total hydrocarbon, the drillability index and the logging water content sensitive parameters by using a standardized normalization analysis and fuzzy mathematical statistics calculation method, and whether the reservoir contains water or not is comprehensively judged.
The following description is given with reference to specific examples:
the method comprises the steps of collecting logging parameters and lithologic oil and gas display data of a certain region, and calculating the water content index of a well drilled through an oil-water interface of the region and the water content index of the well.
And secondly, establishing an oil-water interface judgment standard of the region according to the change of the water content index in the longitudinal direction.
If the oil-water interface judgment standard of the buried hill in the X area is shown in the table 1:
TABLE 1X oil-water interface judging table for buried hill
| Name (R) | Water content index (K)s) |
| Above oil-water interface | Ks＜1000 |
| Below the oil-water interface | Ks＞1000 |
For example, fig. 1 is a well logging diagram of an X region.
Thirdly, after the buried hill interface is uncovered, when the well is drilled to the well depth of 2783m, the conductivity is quickly raised and is increased from 0.52S/m to 0.67S/m, as shown by a curve I in fig. 1; the content of carbon dioxide is increased from 0.38% to 0.42%, as shown by curve II in figure 1; the content of the chloride ions in the drilling fluid is increased from 290mg/L to 920mg/L, as shown in the curve (c) of figure 1; but good display is seen on both the cuttings and the gas-measured total hydrocarbons, as shown by the curve (r) in figure 1; therefore, the oil-water interface is judged to be not obvious by the conventional method. By calculating the water cut index, it can be seen from its change in the longitudinal direction that after the well depth of 2783m (curve (c) of fig. 1), the water cut index rapidly increases, with a significant change in the longitudinal direction; and the water content index is between 165-347 above the well depth of 2783m through calculation; the water content index below the well depth 2783m is between 1100 and 1396, the mean value is more than 1000, the water content index judgment oil-water interface standard of the region is met, and when the water content index is more than 1000, water is produced from the stratum. Therefore, the well depth of the oil-water interface of the well is 2783m as judged by the water cut index.
Fourth step of oil testing verification
The first well section is tested in the open hole below 2783m, and is pumped by a screw pump to obtain oil splash and water of 30m3/d，Cl-: 1064mg/l, water type sodium bicarbonate type, and the test result is a water layer.
And after the first oil testing interval is finished, injecting ash for plugging below the well depth of 2780 m. Then the conventional pumping oil testing is carried out in a well section 2751-2775m, and the daily pure oil is 30m3And the oil testing result is a pure oil layer.
The two-time oil testing result verifies the scientificity of judging and identifying the oil-water interface of the buried hill by using the water content index.
In summary, the disclosure of the present invention is not limited to the above-mentioned embodiments, and persons skilled in the art can easily set forth other embodiments within the technical teaching of the present invention, but such embodiments are included in the scope of the present invention.
Claims (3)
1. A method for identifying an oil-water interface of a buried hill by using a water content index is characterized by comprising the following steps:
firstly, collecting logging-while-drilling parameters and debris oil gas display data of a well;
secondly, dividing the collected data into two types, wherein the first type represents oil-containing sensitive parameters, including gas logging total hydrocarbon and rock debris display levels; the second category represents water-sensitive parameters including outlet conductivity, carbon dioxide content, drilling fluid chloride ion content;
thirdly, processing the parameters classified in the second step
(1) Assigning the oil-containing grade of the rock debris representing the oil-containing sensitive parameter to a specific value, wherein the undisplayed value is 0.5, the fluorescence displayed value is 2, the oil stain displayed value is 4, and the oil stain displayed value is 8; the gas measurement total hydrocarbon value adopts a field actual measurement value;
(2) calculating a base value ratio of outlet conductivity, carbon dioxide content and drilling fluid chloride ion content which represent water-containing sensitive parameters, wherein the base value ratio of the conductivity is equal to the value of the conductivity minus the base value, and the value of the conductivity is multiplied by 100; the carbon dioxide base value ratio is equal to the value of carbon dioxide minus the base value, is compared with the value of carbon dioxide, and is multiplied by 100; the basic value ratio of the chloride ion content is equal to the value of the chloride ion content minus the basic value, and is multiplied by 100 after being compared with the value of the chloride ion content;
fourthly, calculating the drillability index of the well by using the logging engineering parameters, wherein the drillability index is derived from a Bingham formula, the value of the drillability index reflects the drillability of the reservoir, and the reservoir evaluation quantification is realized by the formula:
Kz＝dcn-dcz
wherein d iscz＝[lg(3.282B/(N·T))/lg(0.068W/D)]·ρw/ρceIn the formula, Kz-drillability index; dcz-the drillability of the formation; b-the coefficient of bit wear; n-bit speed, r/min; t-drilling time, min/m; w is weight on bit, kN; d is the diameter of the drill bit, m; rhow-formation water density, g/cm3；ρceCyclic equivalent Density, g/cm3；dcnDenotes dczD is calculated by establishing a trend value using the depth value as the abscissaczSelecting a certain section of stable two groups of coordinate values from a coordinate system with the value of ordinate, substituting the coordinate values into a formula y ═ ax + b, and solving a and b, wherein y represents dcn；
And step five, scientifically fitting the parameter data processed in the step three and the drillability index obtained in the step four to form a water content index:
in the formula, Ks-water cut index; kz-drillability index; t isg-total hydrocarbon content in the formation during drilling; d is the base value ratio of the conductivity; z-carbon dioxide base number ratio; l-chloride ion group in drilling fluidA value ratio; y-oil grade;
and sixthly, judging whether the oil-water interface is drilled or not by comparing the change of the water content index in the longitudinal direction with the change rule of the water content index in the region.
2. The method for identifying the oil-water interface of the buried hill by using the water cut index as claimed in claim 1, wherein the sixth step adopts a trend method to identify the oil-water interface by using the longitudinal change rule of the water cut index, when the water cut index shows an increasing trend, the water cut degree of the reservoir is gradually increased, and the depth of the inflection point of the curve is used as the depth of the oil-water interface identification.
3. The method for identifying the oil-water interface of the buried hill by using the water cut index as claimed in claim 1, wherein the sixth step adopts a numerical method, establishes a numerical judgment standard by the relation between the regional water cut index and the oil-water interface judgment, and takes the appearance depth of an absolute numerical value as the oil-water interface judgment depth.
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Application publication date: 20201208 |