CN114718558B - Method for quickly distinguishing reservoir stratum while drilling by invading rock down-the-hole mountain - Google Patents
Method for quickly distinguishing reservoir stratum while drilling by invading rock down-the-hole mountain Download PDFInfo
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- 238000005553 drilling Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000011435 rock Substances 0.000 title claims description 27
- 238000013316 zoning Methods 0.000 claims abstract description 16
- 238000005259 measurement Methods 0.000 claims abstract description 6
- 239000002734 clay mineral Substances 0.000 claims description 10
- 238000010586 diagram Methods 0.000 claims description 5
- 230000001186 cumulative effect Effects 0.000 claims description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 2
- 239000011707 mineral Substances 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 239000010438 granite Substances 0.000 description 8
- 238000009825 accumulation Methods 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 230000009545 invasion Effects 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 229910021532 Calcite Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000010433 feldspar Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000010187 selection method Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to the technical field of mineral resource exploration, in particular to a method for quickly judging a reservoir while drilling of an invaded rock-buried hill, which comprises the steps of vertically zoning the invaded rock-buried hill according to measurement data to obtain zoning results; calculating single well mechanical specific energy, vertical work and tangential work according to the measured data, calculating a single well mechanical specific energy ratio by utilizing the single well mechanical specific energy, and determining an optimal intersecting scale of the vertical work and the tangential work by utilizing the vertical work and the tangential work to obtain an intersecting result; according to the zoning result of the invasive rock-buried hill, the mechanical specific energy ratio and the vertical work and tangential work intersection result are utilized to comprehensively judge the reservoir of the invasive rock-buried hill, the method finally realizes the rapid judgment of the reservoir while drilling of the invasive rock-buried hill based on the drilling-logging site data, and the reservoir leakage rate is obviously reduced, so that a reliable basis is provided for the on-site drilling decision.
Description
Technical Field
The invention relates to the technical field of mineral resource exploration, in particular to a method for quickly distinguishing a reservoir while drilling by invading a rock-diving hill.
Background
The ancient buried hill is a form of ancient landform, and the bedrock (metamorphic rock, magma rock and sedimentary rock) is degraded by long-term weathering after crust change, so that the surface form is uneven, and then the ancient buried hill is sunk again and covered by a new sedimentary layer, wherein the protruding hills are called the ancient buried hill. The oil gas can be gathered in the ancient buried hill reservoir to form a buried hill type oil gas reservoir. The ancient buried hill formed by the weathering has obvious zonation in the vertical direction, and the rock mechanical properties and reservoir characteristics of each zone are obviously different.
The method for discriminating the reservoir while drilling by utilizing the mechanical specific energy ratio and the tangential work-vertical work intersection is a more effective method, and the following 3 problems exist in discriminating the reservoir while drilling of the rock-invasion mountain by utilizing the mechanical specific energy ratio and the tangential work-vertical work intersection result based on the existing mechanical specific energy base value solving method and tangential work-vertical work intersection scale selecting method:
1) The method for judging the reservoir by obtaining the mechanical specific energy ratio by calculating the mechanical specific energy base value through the fitted trend line of the mechanical specific energy and the well depth is not suitable for the invasion of the rock into the mountain.
2) The selection method of the optimal scale of the intersection of the exact work and the vertical work is not known.
3) How to effectively match the two methods and further accurately judge whether a rock-invasion submarine reservoir has no specific technical scheme.
Disclosure of Invention
The invention aims to provide a method for quickly distinguishing a reservoir while drilling by an invasive rock-buried hill, which aims to quickly distinguish the reservoir while drilling by the invasive rock-buried hill based on drilling-logging site data, and the reservoir leakage rate is obviously reduced, so that a reliable basis is provided for site drilling decisions.
In order to achieve the purpose, the invention provides a method for quickly judging a reservoir while drilling of an invasive rock-diving mountain, which comprises the steps of vertically zoning the invasive rock-diving mountain according to measurement data to obtain zoning results;
calculating the mechanical specific energy, the vertical work and the tangential work of the single well according to the measured data;
calculating a single well mechanical specific energy ratio by using the single well mechanical specific energy;
Determining the optimal intersection scale of the vertical work and the tangential work by utilizing the vertical work and the tangential work to obtain an intersection result;
And comprehensively judging the reservoir of the invaded rock-buried hill by utilizing the mechanical specific energy ratio and the vertical work and tangential work intersection result according to the zoning result of the invaded rock-buried hill.
The measurement data comprise the lithology and zonal thickness of a single well logging, the numerical values of the clay mineral content and the Fe content during drilling and the curve form thereof.
The vertical zonation comprises a gravel weathering zone, a weathering fracture zone, an inner curtain breaking zone and a bedrock zone from top to bottom.
Wherein the specific mechanical energy is calculated based on weight on bit, rate of penetration of the rotary table, time of drilling and diameter of the drill bit.
The concrete mode of the vertical work calculation is to calculate the vertical work by using the weight on bit and the diameter of the drill bit.
The tangential work is calculated by using the weight on bit, the rotating speed of the rotary table, the drilling time and the diameter of the drill bit.
The specific mode of calculating the mechanical specific energy ratio of the single well is that if the single well drills into bedrock zones, the geometric average value of the mechanical specific energy of each bedrock zone is used as the mechanical specific energy base value of the well; if a single well does not drill a bedrock zone, taking the mechanical specific energy base value of an adjacent well closest to the single well as the mechanical specific energy base value of the single well; the mechanical specific energy ratio is calculated by ratio of the mechanical specific energy of each well to the mechanical specific energy base value of that well.
The concrete mode for calculating the optimal scale of the intersection of the vertical work and the tangential work is as follows:
Firstly, because the values of the vertical work and the tangential work are both larger than or equal to 0, the minimum value of the vertical work and the tangential work when 0 is used as intersection;
determining the maximum value of the vertical work and the tangential work in the intersecting process, establishing a vertical work-tangential work scatter diagram by taking the tangential work as an abscissa and the vertical work as an ordinate, and taking the maximum value of the vertical work in all data as the maximum value of the vertical work in the intersecting process;
Calculating the ratio of tangential work to vertical work of all data points, establishing a tangential work/vertical work ratio value accumulation frequency curve, reading the value n (taking an integer) at the inflection point of the curve, and enabling the maximum value of the tangential work to be n times of the maximum value of the vertical work during intersection.
The method for comprehensively distinguishing the invaded rock-buried hill reservoir comprises the steps of comprehensively distinguishing the invaded rock-buried hill reservoir by utilizing the magnitude of the mechanical specific energy ratio and the intersection result of the vertical work and the tangential work according to the vertical zoning result of the invaded rock-buried hill; specifically, for gravel weathered zone and weathered fracture zone, only the interval with the mechanical specific energy ratio of < 1 is the reservoir, and for inner curtain fracture zone and bedrock zone, only the interval with the mechanical specific energy ratio of < 1 and the tangential work and vertical work in the intersection area is judged as the reservoir.
The invention relates to a method for quickly judging a reservoir while drilling by an invasive rock and a down-hole mountain, which aims at the problem that the reservoir leakage rate is high when the reservoir of the invasive rock and down-hole mountain is judged while drilling by the conventional method and the technical key points of the method.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for quickly discriminating a reservoir while drilling of an invasive rock down-the-hole mountain of the present invention.
FIG. 2 is a flowchart showing specific steps in calculating the optimum scale for the intersection of vertical and tangential work.
FIG. 3 is a histogram of the vertical zonal identification feature of an intrusion rock downhill from the Y831 well in the Songnan low bulge Y-zone of the Qionsoutheast basin and reservoir discrimination while drilling.
FIG. 4 is a cross-sectional view of a Qiondong basin Songnan low-protrusion Y-region Y831-Y832-Y811-Y812-invasive rock-diving hill vertical zonal identification feature and reservoir discrimination while drilling.
FIG. 5 is a plot of vertical work-tangential work correlation for intrusion into a rock-buried hill in the Songnan low-bulge Y region of the Qionsoutheast basin.
FIG. 6 is a graph of cumulative frequency of tangential work/vertical work ratio values for intrusion into a rock downhill in the low convex Y-zone of the Songdong basin.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The specific embodiment of the invention is as follows:
referring to fig. 1 to 6, the present invention provides a method for quickly identifying a reservoir while drilling by an invasive rock-diving hill, comprising:
s101, vertically zoning the invaded rock down-the-hill mountain according to the measured data to obtain zoning data;
The measurement data comprise the lithology of a single well logging, the zonal thickness, the numerical values of drilling time, the clay mineral content and the Fe content and the curve form thereof. The vertical zonation includes a gravel weathering zone, a weathered fracture zone, an inner curtain fracture zone, and a bedrock zone.
The gravel weathering zone is logging lithology which is sand or granite, and the thickness is 0-10 m (figure 2); if the lithology of the logging is thin-layer conglomerate (< 10 m), the drilling time is obviously higher than that of the underlying granite, and the drilling time curve is funnel-shaped, the logging lithology is a loose gravel weathering zone (such as Y832 well and Y812 well) (figures 2 and 3); if the logging lithology on the granite is thick-layer sand, the characteristics of cap layer transportation and accumulation are reflected, and the sand weathered zone is difficult to preserve (such as Y811 well) (figure 3); when the lithology of the logging is granite and the overburden is mudstone, the gravel weathered zone can be divided from the granite (such as Y831 well) according to the remarkable reduction of drilling under the boundary between the two and the funnel shape of the curve during drilling, and if the drilling has no obvious change, the gravel weathered zone is not developed (figures 2 and 3);
The weathered fracture zone is formed by logging lithology, the rock is hard in whole, and the structural characteristics of the granite are basically reserved; because of the influence of the weathering leaching effect, the erosion holes and the weathering leaching seams are relatively developed, so that the drilling time is lower than the overlying gravel weathering belt and is obviously higher than the underlying inner curtain breaking belt, and the drilling time curve is in a low-amplitude funnel shape or box shape (figures 2 and 3); meanwhile, as feldspar is changed into clay minerals in the weathering process, the weathered fracture zone has a clay mineral content (generally > 15%) which is significantly higher than that of the underlying inner curtain fracture zone (fig. 2 and 3);
The inner curtain breaking belt is formed by taking logging lithology as granite, cracks develop, the density of the cracks generally tends to decrease along with the increase of depth, but the intensive development belt of the cracks can be seen locally, and the cracks are mostly filled with iron calcite, iron dolomite and the like; therefore, the total content of clay mineral (generally less than 8.0 m/h), clay mineral (generally less than 3.0%) and Fe element (generally less than 3.5%) is low, the total content is obviously lower than that of an overlying weathered fracture zone, the local part of the fracture zone shows the characteristic of increase, the curve forms of the three are all relatively straight, and the local protrusion or tooth formation is obvious (figures 2 and 3);
The bedrock zone is mainly composed of fresh granite, develops a small amount of cracks, has low values in total of clay mineral content (generally < 6.0 m/h), clay mineral content (generally < 2.5%) and Fe element content (generally < 3.2%), but has straight or micro-dentated curve morphology (figures 2 and 3).
S102, calculating the mechanical specific energy, the vertical work and the tangential work of a single well according to the measured data;
Taking Fan Honghai (2012) as an example, the specific mechanical energy is calculated based on weight on bit, rate of penetration of the rotary table, time of drilling, and bit diameter.
Wherein: m SE is the mechanical specific energy, MPa, WOB is the weight on bit, kN; RPM is the rotating speed of the rotary table, r/min; ROP is m/h when drilling; dia is the diameter of the drill bit, mm;
The concrete mode of the vertical work calculation is to calculate the vertical work by using the weight on bit and the diameter of the drill bit.
Wherein: w H is vertical work, MPa;
the tangential work is calculated by using the weight on bit, the rotating speed of the rotary table, the drilling time and the diameter of the drill bit.
Wherein: w L is tangential work, MPa;
s103, calculating a single-well mechanical specific energy ratio by the single-well mechanical specific energy;
The specific mode of calculating the specific mechanical energy ratio of a single well is that if the single well drills into bedrock zones, the geometric average value of the specific mechanical energy of each bedrock zone is used as the specific mechanical energy base value of the well; if a single well does not drill a bedrock zone, taking the mechanical specific energy base value of an adjacent well closest to the single well as the mechanical specific energy base value of the single well; the mechanical specific energy ratio is calculated by ratio of the mechanical specific energy of each well to the mechanical specific energy base value of that well. In fig. 3, the mechanical specific energy base value of the Y812 well is taken as the mechanical specific energy base value of the Y812 well without drilling the bedrock zone.
Wherein: k b is the mechanical specific energy ratio, dimensionless; m SE is the mechanical specific energy, MPa; e n is the mechanical specific energy base value, MPa;
S104, determining the optimal scale of the intersection of the vertical work and the tangential work by utilizing the vertical work and the tangential work;
the concrete mode for calculating the optimal scale of the intersection of the vertical work and the tangential work is as follows:
s401 is the minimum value of vertical work and tangential work when 0 is intersected;
S402, determining the maximum value of vertical work in intersection, establishing a vertical work-tangential work scatter diagram by taking tangential work as an abscissa and vertical work as an ordinate, and taking the maximum value of vertical work in all data as the maximum value of vertical work in intersection;
and respectively taking tangential work and vertical work as horizontal and vertical coordinates, establishing a vertical work-tangential work scatter diagram (figure 4), and taking the maximum value of the vertical work in all data of 4.5MPa as the maximum value of the vertical work when intersecting.
S403, determining the maximum value of tangential work in intersection, calculating the ratio of tangential work to vertical work of all data points, establishing a cumulative frequency curve of tangential work/vertical work ratio values, reading the value n (integer) at the inflection point of the curve, and enabling the maximum value of tangential work in intersection to be n times of the maximum value of vertical work.
A tangential work/vertical work ratio value accumulation frequency curve is established (figure 5), and the numerical value at the inflection point of the curve is read to be 22 (taking an integer), and the maximum value of tangential work in the intersecting process is 22 times the maximum value of vertical work, namely 99MPa.
The optimal scales of the vertical work and the tangential work are respectively 0-4.5 MPa and 0-99 MPa, and the vertical work and the tangential work are intersected according to the optimal scales of the vertical work and the tangential work, so as to obtain an intersection result.
S105, comprehensively judging the reservoir of the invaded rock and the submarine mountain by utilizing the mechanical specific energy ratio and the vertical work and tangential work intersection results according to the invaded rock and the submarine mountain zoning results.
The concrete mode of comprehensively distinguishing the rock-invaded down-the-hill reservoir is a gravel weathering zone and a weathering fracture zone, and the reservoir is only a reservoir section with the mechanical specific energy ratio less than 1; the reservoir is determined by the interval of the inner curtain breaking zone and the bedrock zone, wherein the ratio of the mechanical specific energy is less than 1 and the tangential work and the vertical work are in an intersection area.
Quick discrimination effect of deep water region Songdong south low-bulge Y region invasion rock down-the-hole reservoir while drilling: quantitatively evaluating the accuracy and reliability of the reservoir discrimination result while drilling by adopting the parameter of reservoir leakage rate; "reservoir loss" reflects the ratio of the total reservoir thickness not determined by the while-drilling method to the total reservoir thickness interpreted by the logging (equation 5), wherein the single-well while-drilling method does not determine the reservoir monolayer thickness from top to bottom in terms of H 1、h2……hn, the unit m in terms of Shan Jingce are the unit H 1、H2……Hn from top to bottom;
Reservoir leak rate= (h 1+h2+……+hn)/(H1+H2+……+Hn) (5)
The single-well while-drilling reservoir discrimination histogram intuitively and qualitatively shows that the reservoir based on the well drilling-logging parameter discrimination has better matching degree with the reservoir explained by well logging (figures 2 and 3); the quantitative statistics and analysis of the reservoir loss rate also show that the method for judging the reservoir of the invaded rock-under-the-mine has higher reliability, the reservoir loss rate is obviously reduced, the reservoir loss rate of all wells is less than 28 percent, and the minimum is only 5 percent (table 1).
TABLE 1
According to the technical scheme, the invention provides a method for quickly judging a reservoir while drilling by invading a rock-diving hill; firstly, vertically zoning an invaded rock down-the-hill according to the lithology and zoning thickness of a single well logging, the numerical values and curve forms of the clay mineral content and the Fe content during drilling; secondly, calculating the mechanical specific energy, vertical work and tangential work of a single well by using the drilling pressure, the rotating speed of the rotary table, the drilling time and the diameter of the drill bit; taking the mechanical specific energy geometric average value of each well bedrock zone as a mechanical specific energy base value, and calculating the mechanical specific energy ratio of the well to invade the rock buried hill; meanwhile, according to the vertical power-tangential power scatter diagram and a tangential power/vertical power ratio value accumulation frequency curve, determining the optimal scale of tangential power and vertical power intersection, and obtaining an intersection result; and finally comprehensively judging the rock invasion into the reservoir according to the mechanical specific energy ratio and the tangential work-vertical work intersection result.
The invention provides a method for quickly judging a reservoir while drilling by an invasive rock and a down-hole mountain, which aims at the problem that the reservoir leakage rate is high when the reservoir of the invasive rock and down-hole mountain is judged while drilling by the conventional method and the technical key points of the method.
The above disclosure is only a preferred embodiment of the present invention, and it should be understood that the scope of the invention is not limited thereto, and those skilled in the art will appreciate that all or part of the procedures described above can be performed according to the equivalent changes of the claims, and still fall within the scope of the present invention.
Claims (5)
1. A method for quickly distinguishing a reservoir while drilling by invading a rock-diving mountain is characterized in that,
The method comprises the steps of carrying out vertical zoning on an invaded rock down-the-road mountain according to measurement data to obtain zoning results, wherein the vertical zoning comprises a gravel weathering zone, a weathering fracture zone, an inner curtain breaking zone and a bedrock zone from top to bottom;
calculating the mechanical specific energy, the vertical work and the tangential work of the single well according to the measured data;
calculating a single-well mechanical specific energy ratio by using the single-well mechanical specific energy ratio, wherein the specific mode of calculating the single-well mechanical specific energy ratio is that if a single well is drilled to meet a bedrock zone, the mechanical specific energy geometric average value of each well bedrock zone is used as the mechanical specific energy base value of the well; if the single well is not drilled with a bedrock zone, taking the mechanical specific energy base value of an adjacent well closest to the single well as the mechanical specific energy base value of the well; calculating a mechanical specific energy ratio by comparing the mechanical specific energy of each well with the mechanical specific energy base value of the well;
Utilizing the vertical work and the tangential work to determine the optimal scale of the vertical work and the tangential work to obtain an intersection result, wherein the calculation mode of the optimal scale of the vertical work and the tangential work is as follows: taking 0 as the minimum value of vertical work and tangential work when intersecting; determining the maximum value of the vertical work and the tangential work at the intersection; establishing a vertical work-tangential work scatter diagram by taking tangential work as an abscissa and vertical work as an ordinate, and taking the maximum value of the vertical work in all data as the maximum value of the vertical work when intersecting; calculating the ratio of tangential work to vertical work of all data points, and establishing a cumulative frequency curve of tangential work and vertical work ratio values; reading the value at the inflection point of the curve as n, wherein n is an integer, and the maximum value of tangential work is n times of the maximum value of vertical work during intersection;
According to the zoning result of the invaded rock-diving mountain, the mechanical specific energy ratio and the tangential work intersection result are utilized to comprehensively judge the invaded rock-diving mountain reservoir, and the method specifically comprises the following steps: for gravel weathering bands and weathered fracture bands, only the interval with the mechanical specific energy ratio less than 1 is used as the reservoir, and for inner curtain fracture bands and bedrock bands, only the interval with the mechanical specific energy ratio less than 1 and the intersection area of tangential work and vertical work is used as the reservoir.
2. The method for rapidly distinguishing a reservoir while drilling by invading a rock buried hill according to claim 1,
The measurement data comprise the lithology of a single well logging, the zonal thickness, the numerical values of the drilling time, the clay mineral content and the Fe content and the curve form thereof.
3. The method for rapidly distinguishing a reservoir while drilling by invading a rock buried hill according to claim 1,
The mechanical specific energy is calculated based on weight on bit, rotary table drilling rate, drilling time and drill bit diameter.
4. The method for rapidly distinguishing a reservoir while drilling by invading a rock buried hill according to claim 1,
The vertical work is calculated by using the weight on bit and the diameter of the drill bit.
5. The method for rapidly distinguishing a reservoir while drilling by invading a rock buried hill according to claim 1,
The tangential work is calculated by using the weight on bit, the rotating speed of the rotary table, the drilling time and the diameter of the drill bit.
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