CN110924942B - Method for evaluating permeability of rock stratum hole while drilling in logging operation - Google Patents
Method for evaluating permeability of rock stratum hole while drilling in logging operation Download PDFInfo
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- CN110924942B CN110924942B CN201911100449.4A CN201911100449A CN110924942B CN 110924942 B CN110924942 B CN 110924942B CN 201911100449 A CN201911100449 A CN 201911100449A CN 110924942 B CN110924942 B CN 110924942B
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- 239000011435 rock Substances 0.000 title claims abstract description 84
- 238000005553 drilling Methods 0.000 title claims abstract description 45
- 230000035699 permeability Effects 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000011156 evaluation Methods 0.000 claims abstract description 36
- 239000011777 magnesium Substances 0.000 claims abstract description 14
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 10
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 10
- 239000011593 sulfur Substances 0.000 claims abstract description 8
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 8
- 238000005516 engineering process Methods 0.000 claims description 25
- 230000015572 biosynthetic process Effects 0.000 claims description 11
- 238000004364 calculation method Methods 0.000 claims description 7
- 239000004215 Carbon black (E152) Substances 0.000 claims description 5
- 229930195733 hydrocarbon Natural products 0.000 claims description 5
- 150000002430 hydrocarbons Chemical class 0.000 claims description 5
- 238000005457 optimization Methods 0.000 claims description 5
- 239000011148 porous material Substances 0.000 abstract description 15
- 238000012545 processing Methods 0.000 abstract description 4
- 238000005755 formation reaction Methods 0.000 description 7
- 238000011161 development Methods 0.000 description 6
- 230000003628 erosive effect Effects 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000009533 lab test Methods 0.000 description 3
- 150000003839 salts Chemical group 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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 OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- Life Sciences & Earth Sciences (AREA)
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- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a method for evaluating the permeability of a rock stratum hole while drilling in logging operation, which comprises the following steps: step 1, respectively mastering stratum characteristic information of a stratum target section in a drilling engineering logging and element logging mode; step 2, well logging engineering parameters are preferably selected from the obtained stratum characteristic information, a rock engineering evaluation index K1 is established, and the maximum value of K1 of the part above the target section of the rock stratum is K1 max ，K1/K1 max Is marked as K1'; step 3, selecting elements of magnesium and sulfur of logging of the rock stratum target section, establishing a rock element evaluation index K2, wherein the maximum value of K2 of the part above the rock stratum target section is K2 max ，K2/K2 max Is marked as K2'; and 4, performing thinning or interpolation processing on the K1 'and the K2' to keep the corresponding well depths, wherein the sum of the depth values of the K1 'and the K2' at the same depth value is an index for comprehensively evaluating the permeability of the rock stratum pores. The invention can realize timely, accurate and reliable effective evaluation on the permeability of the rock stratum.
Description
The technical field is as follows:
the invention relates to an evaluation technology of rock stratum pore permeability, in particular to a method for evaluating the rock stratum pore permeability while drilling in logging operation.
Background art:
logging operation is the most basic technology in the exploration and development activities of oil and gas reservoirs, is the most timely and direct technical means for finding and evaluating the oil and gas reservoirs, has the characteristics of timely and various underground information acquisition and rapid analysis and interpretation, and provides reliable information service support for drilling operation.
In the exploration and development of oil and gas reservoirs, geological evaluation of rock drilling layers needs to be carried out in time. In geological evaluation, the pore permeability evaluation of rock formations is one of the key parameters of interest, and is particularly highlighted by erosion reservoirs. By evaluating and grasping the permeability of the rock stratum, the gas bearing property of the rock stratum can be effectively and comprehensively evaluated.
At present, the evaluation of the permeability of the rock stratum is mastered and is mainly obtained by a logging means after drilling or a laboratory test analysis means. However, since the post-drilling logging means or the laboratory test analysis means have time lag, the pore permeability of the rock stratum is evaluated by the data, so that it is difficult to provide timely and reliable information service support for exploration and development of the reservoir stratum, and the post-drilling logging means or the laboratory test analysis means have the technical problems of high cost and the like.
The invention content is as follows:
the technical purpose of the invention is as follows: aiming at the defects of the prior art, the evaluation method capable of timely, accurately and reliably evaluating the permeability of the rock stratum while drilling in logging operation is provided.
The technical purpose of the invention is realized by the following technical scheme, namely a method for evaluating the permeability of a rock stratum hole while drilling in logging operation, which comprises the following specific process steps:
step 1, respectively mastering stratum characteristic information of a stratum target section by a drilling engineering logging technology and an element logging technology;
step 3, selecting elements of magnesium and sulfur in the logging of the rock stratum target section, establishing a rock element evaluation index K2, wherein the maximum value of the rock element evaluation index K2 of the part above the rock stratum target section is K2 max ，K2/K2 max Is marked as K2';
and 4, performing rarefaction or interpolation treatment on the K1 'and the K2' to keep the corresponding well depths, wherein the sum of the depth values of the K1 'and the K2' at the same depth value is an index for comprehensively evaluating the permeability of the rock stratum pores.
As one of the preferable schemes, the rock engineering evaluation index K1 in the step 2 is obtained according to the following calculation model:
as one of preferable schemes, the rock element evaluation index K2 in step 3 is obtained according to the following calculation model:
K2＝Mg/Mg MAX +S/S MAX ；
in the formula, mg is the content of magnesium element in a rock stratum target section at a certain depth;
s is the content of sulfur element in a rock stratum target section at a certain depth;
Mg MAX the maximum value of the magnesium element above the target section of the rock stratum;
S MAX is the maximum value of elemental sulfur in the portion of the formation above the target zone.
As one of the preferable schemes, the optimization of the logging engineering parameters in the step 2 is preferably processed by using the optimization criteria of lower drilling time or higher gas logging total hydrocarbon under the same drilling parameter condition.
As one of the preferable schemes, the rock stratum in the step 1 is a rock stratum of a corrosion reservoir stratum.
The beneficial technical effects of the invention are as follows: the method is based on the well drilling engineering logging technology and the element logging technology, the pore permeability of the rock stratum is timely, accurately and reliably effectively evaluated according to the engineering parameters and element information acquired while drilling in logging operation, the evaluation result can provide timely, fast, accurate and reliable information service support for exploration and development of the oil and gas reservoir (particularly the erosive reservoir), and the exploration and development efficiency of the oil and gas reservoir (particularly the erosive reservoir) is improved.
Description of the drawings:
FIG. 1 is a schematic diagram of the evaluation effect while drilling of Z well comprehensive evaluation rock stratum permeability index in some places in Sichuan.
The specific implementation mode is as follows:
the invention relates to an evaluation technology of rock stratum pore permeability, in particular to a method for evaluating the rock stratum pore permeability while drilling in logging operation, and the technical content of the invention is explained in detail below.
The invention comprises the following specific process steps:
step 1, respectively mastering stratum characteristic information of a stratum target section of the same oil and gas reservoir by a drilling engineering logging technology and an element logging technology, and performing data arrangement by using the grasped stratum characteristic information as a scale for data arrangement according to depth;
the rock stratum is a rock stratum of the erosive reservoir stratum;
therefore, logging engineering parameters are preferably selected from the formation characteristic information obtained by the drilling engineering logging technology and the element logging technology, and the logging engineering parameters are preferably selected according to the principle that the lower the drilling time is under the condition of the same drilling parameters, the lower the drilling time is the preferred standard, or the higher the gas logging total hydrocarbon is under the condition of the same drilling parameters, the preferred standard is that: in carbonate rock stratum, under the condition of the same drilling parameters, the lower the drilling time, the better the drillability of the stratum is reflected, so that the stratum generally has better hole permeability, and the main drilling parameters influencing the drilling time are rotating speed and drilling pressure; in a carbonate stratum, under the condition of the same drilling parameters, the higher the gas logging total hydrocarbon is, the better the gas content of the stratum is reflected, and the good hole permeability of the stratum is indirectly reflected; according to the optimization principle, corresponding parameters such as drilling time, total hydrocarbon, rotating speed, drilling pressure and the like are preferably selected from stratum characteristic information obtained by a drilling engineering logging technology and an element logging technology;
establishing a rock engineering evaluation index K1 through the optimized logging engineering parameters, wherein the rock engineering evaluation index K1 is obtained according to the following calculation model:
the maximum value of the rock engineering evaluation index K1 of the part above the target section of the rock stratum is K1 max ，K1/K1 max Is marked as K1';
and 3, selecting elements of magnesium and sulfur in the logging of the rock stratum target section, and establishing a rock element evaluation index K2, wherein the rock element evaluation index K2 is obtained according to the following calculation model:
K2＝Mg/Mg MAX +S/S MAX ；
in the formula, mg is the content of magnesium element in a rock stratum target section at a certain depth;
s is the content of sulfur element in a rock formation target section in a certain depth;
Mg MAX the maximum value of the magnesium element above the target section of the rock stratum;
S MAX the maximum value of the sulfur element above the target section of the rock stratum;
the maximum value of the rock element evaluation index K2 of the part above the target section of the rock stratum is K2 max ，K2/K2 max Is marked as K2';
and 4, performing thinning or interpolation processing on the K1 'and the K2' to keep the well depths of the K1 'and the K2' in one-to-one correspondence, and adding the data of the K1 'and the K2' at the same depth value, wherein the addition result (namely the sum of the data of the K1 'and the K2' at the same depth value) is an index K for comprehensively evaluating the permeability of the rock stratum pores, namely, the K = K1'+ K2', and the larger the K value is, the better the permeability of the rock stratum is.
The reason for statistically collating the relevant data in the step 2 is that the lower part of the target section of the rock stratum of the erosive reservoir stratum is a paste salt part, the paste salt part is a compact lithology section, the content of the S element is obviously increased when the element is logged to the lower part of the target section of the rock stratum, and the sections below the section are non-pore-permeable development sections. And at the moment, the paste salt layer section is identified only by using the content of the S element, and the calculation and the judgment of comprehensively evaluating the rock stratum pore permeability index are not involved.
The reason for the thinning or interpolation processing in step 4 is that the well logging technology is generally one data per meter, and the element logging technology is data with unequal intervals, so that the element logging is not performed for each meter of sampling, and the corresponding interpolation or thinning processing is performed on K2 'to keep the same as the well depth scale of K1'.
The invention is tested in the four zones of the formation in the Sichuan Z well, and the technical scheme of the invention is further elaborated and explained in detail by combining the test data in Table 1 and the example in FIG. 1.
The formation characteristic information obtained by the well engineering logging technology and the element logging technology of the Z well is shown in the following table 1.
TABLE 1 formation characteristic information data obtained by well drilling engineering logging technology and element logging technology of Z well
The acquisition process of comprehensively evaluating the porosity and permeability index of the rock stratum comprises the following steps:
(1) Acquiring drilling engineering logging and element logging data of a Z well;
(2) The Z well enters into the fourth section of the mine from 6145m, and the S element is obviously increased below 6228 m;
(3) Respectively calculating a rock engineering evaluation index K1 and an element evaluation index K2;
(4) Counting the maximum values of K1 and K2 in the well sections 6145-6228 m, wherein the maximum values are 0.3979 (removing 2 special abnormal data) and 1.1223 respectively, and calculating K1 'and K2';
(5) The well element logging part well section is encrypted and sampled, so that K2 'is subjected to thinning treatment to correspond to the depth of K1';
(6) Comprehensively evaluating the porosity index K = K1'+ K2' of the rock stratum, and the larger the value, the better the porosity is.
The comprehensive evaluation rock stratum pore permeability index obtained through the process is shown in figure 1, and the Z-well comprehensive evaluation rock stratum pore permeability index is better in coincidence with a drilled well logging interpretation pore permeability curve, so that the on-site rapid evaluation and use can be met.
The above specific technical solutions are only used to illustrate the present invention, but not to limit it; although the present invention has been described in detail with reference to the specific embodiments thereof, it will be appreciated by those skilled in the art that; the present invention may still have equivalents substituted for those specific technical aspects or some technical features thereof, without departing from the spirit and scope of the present invention.
Claims (4)
1. A method for evaluating the permeability of a rock stratum hole while drilling in logging operation is characterized by comprising the following specific process steps:
step 1, respectively mastering stratum characteristic information of a stratum target section by a drilling engineering logging technology and an element logging technology;
step 2, well logging engineering parameters are preferably selected from stratum characteristic information obtained by a well drilling engineering well logging technology and an element well logging technology, a rock engineering evaluation index K1 is established, and the maximum value of the rock engineering evaluation index K1 of the part above a rock stratum target section is K1 max ，K1/K1 max Is marked as K1';
step 3, selecting elements of magnesium and sulfur in the logging of the rock stratum target section, establishing a rock element evaluation index K2, wherein the maximum value of the rock element evaluation index K2 of the part above the rock stratum target section is K2 max ，K2/K2 max Is marked as K2';
step 4, performing thinning or interpolation treatment on the K1 'and the K2' to keep the K1 'and the K2' at corresponding well depths, wherein the sum of the K1 'and the K2' at the same depth value is an index for comprehensively evaluating the permeability of the rock stratum;
the rock engineering evaluation index K1 in the step 2 is obtained according to the following calculation model:
2. the method for evaluating the permeability of the rock stratum while drilling in the logging operation as claimed in claim 1, wherein the rock element evaluation index K2 in the step 3 is obtained according to the following calculation model:
K2＝M g /M gmax +S/S max ；
in the formula, M g The content of magnesium element in a rock stratum target section at a certain depth;
s is the content of sulfur element in a rock stratum target section at a certain depth;
M gmax the maximum value of the magnesium element above the target section of the rock stratum;
S max is the maximum value of elemental sulfur above the target section of the formation.
3. The method for evaluating the permeability of the rock stratum during drilling in the logging operation as claimed in claim 1, wherein the optimization of the logging engineering parameters in the step 2 is preferably processed by using the lower drilling time or the higher gas logging total hydrocarbon under the condition of the same drilling parameters as the optimization standard.
4. The method for evaluating the permeability of the formation during drilling in the logging operation as recited in claim 1, wherein the formation in step 1 is a formation of an erodible reservoir.
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Effective date of registration: 20220208 Address after: 100027 Chaoyangmen North Street, Chaoyang District, Chaoyang District, Beijing Applicant after: SINOPEC Group Applicant after: SINOPEC OILFIELD SERVICE Corp. Applicant after: Sinopec Jingwei Co.,Ltd. Applicant after: Southwest measurement and control company of Sinopec Jingwei Co.,Ltd. Applicant after: Southwest logging branch of Sinopec Jingwei Co.,Ltd. Address before: No. 9 Jishikou Road, Chaoyang District, Beijing 100020 Applicant before: SINOPEC OILFIELD SERVICE Corp. Applicant before: GEOLOGIC LOGGING COMPANY OF SOUTHWEST PETROLEUM BUREAU, SINOPEC |
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