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Method for evaluating physical property of sand-gravel reservoir by using nuclear magnetic pressure physical property indexes

A technology for reservoir physical properties and glutenite, which is used in the field of oil and gas well testing and production testing, and can solve problems such as difficulties in oil testing and fracturing layer selection, and inconsistent oil testing results.

Active Publication Date: 2019-08-30
CNPC XIBU DRILLING ENG +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a method for evaluating the physical properties of sandy conglomerate reservoirs by using nuclear magnetic pressure physical property indexes, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the inconsistency between the existing well logging data evaluation method and the oil test results. Oil and fracturing layer selection bring difficult problems

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  • Method for evaluating physical property of sand-gravel reservoir by using nuclear magnetic pressure physical property indexes
  • Method for evaluating physical property of sand-gravel reservoir by using nuclear magnetic pressure physical property indexes
  • Method for evaluating physical property of sand-gravel reservoir by using nuclear magnetic pressure physical property indexes

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Embodiment 1

[0026] Embodiment 1: as attached figure 1 As shown, the method for evaluating the physical properties of sandy conglomerate reservoirs by using the nuclear magnetic pressure physical property index includes the following steps:

[0027] S1: Collect the drilling fluid density ρ used when the tested oil wells drilled through the target interval in the study area m ;

[0028] S2: Collect the conventional logging data of the research area, the reservoir thickness H, the acoustic time difference Δt, and the skeleton time difference ΔT of the pilot oil interval ma and density calculated porosity value;

[0029] S3: Collect the nuclear magnetic logging data of the study area, the nuclear magnetic permeability k and the nuclear magnetic total porosity of the pilot test oil layer and capillary porosity

[0030] S4: Construct the nuclear magnetic pressure physical property index, the formula is:

[0031]

[0032] Among them, H is the reservoir thickness, unit: m; ρ m is th...

Embodiment 2

[0043] Embodiment 2: as attached figure 2 , 3 As shown in Table 1, the method of evaluating the physical properties of glutenite reservoirs using nuclear magnetic pressure physical property indexes is applied to the low-permeability glutenite reservoirs in the Mahu area of ​​Xinjiang Oilfield, including the following steps:

[0044] The first step is to collect the drilling fluid density ρ used when the test wells drilled through the target interval in the Permian glutenite in the Mahu area m ;

[0045] The second step is to collect the conventional logging data in the Mahu area, the reservoir thickness H, the acoustic wave time difference Δt, and the skeleton time difference ΔT ma , using the rock electricity experiment data in the Mahu area, the relationship between porosity and density is obtained as y=-0.0172x+2.65, and the calculation value;

[0046] The third step is to collect the NMR logging data of the Mahu area, the NMR permeability k and the NMR total porosity...

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Abstract

The invention relates to the technical field of oil and gas well trial production, in particular to a method for evaluating the physical property of a sand-gravel reservoir by using nuclear magnetic pressure physical property indexes, which comprises the following steps: S1, collecting the density [reo] m of drilling fluid of a tested oil well in a research area; S2, collecting the reservoir thickness H, the acoustic wave time difference [delta] t, the skeleton time difference [delta] Tma and the density of the oil testing layer section of the research area; S3, collecting the nuclear magneticpermeability k, the nuclear magnetic total porosity and the capillary porosity of the oil testing layer section of the research area; S4, constructing a nuclear magnetic pressure physical property index; S5, calculating to obtain a well testing flow coefficient kh / [mu] of the tested oil well; S6, carrying out assignment calculation on the coefficients [alpha], [eta] and [gamma]; S7: (1) substituting assignment of [alpha], [eta] and [gamma] obtained by a correlation coefficient R2 greater than or equal to 0.85 as an empirical coefficient of a research area into S4; and S8, calculating the nuclear magnetic pressure physical index of each potential layer of the new well A. According to the method, the nuclear magnetic pressure physical property index is checked through the tested oil well dynamic data, evaluation on the pore permeability characteristics of the sand-gravel reservoir before oil testing is achieved, and oil testing and fracturing layer selection work is effectively guided.

Description

technical field [0001] The invention relates to the technical field of oil and gas well testing and production testing, and relates to a method for evaluating the physical properties of sandy conglomerate reservoirs by using nuclear magnetic pressure physical property indexes. Background technique [0002] According to previous research results, the productivity of glutenite reservoirs is mainly affected by multiple factors such as physical properties, pore structure, clay content, reservoir thickness, and formation pressure. Specific to the static data, the drilling fluid density can reflect the formation pressure to a certain extent; the conventional and nuclear magnetic logging data can reflect the porosity and permeability conditions of the reservoir, especially the nuclear magnetic logging can directly measure the movable fluid signal in the rock pores, and the dynamic data in the The flow coefficient (kh / μ) can reflect the difficulty of the fluid flowing in the pores. ...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06Q10/06G06Q50/02G01N24/08G01V3/32
CPCG06Q10/06393G06Q50/02G01V3/32G01N24/081G06F2119/06G06F30/20Y02A90/30
Inventor 封猛胡广文刘钰丁心鲁徐伟红张晓文王金礼李轶王立新刘慧韦钦杰杨晓儒高亮
Owner CNPC XIBU DRILLING ENG
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