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Single-well control reserve calculation and residual gas analysis method for low-permeability tight gas reservoir

A technology of reserve calculation and analysis method, which is applied in the field of single well controlled reserve calculation and residual gas analysis in low permeability tight gas reservoirs, and can solve problems such as pressure imbalance, drop, and low single well production.

Active Publication Date: 2019-10-15
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] (1) The formation characteristics of the D1 block are characterized by low porosity and low permeability, poor reservoir physical properties, strong heterogeneity, large lateral changes in the reservoir, belonging to lithologically closed gas reservoirs, and special seepage phenomena such as start-up pressure gradient and stress sensitivity.
Both the start-up pressure gradient and stress sensitivity will affect the seepage of fluid in the reservoir, resulting in a decrease in the control range of a single well, a decrease in the control reserves of a single well, and a decrease in the control reserves of a single well and the prediction accuracy of remaining gas
[0018] (2) There are 52 gas wells in the D1 block. The D1 gas reservoir has been put into production since the beginning of 2005. The production of each single well is low. The production to the block has entered a decline period, and the daily production level has been declining. At the same time, the average formation pressure, oil pressure, casing The average pressure drops sharply, the formation energy loss is large, and the pressure is unbalanced, resulting in a large difference in the influence of threshold pressure gradient and stress sensitivity on the seepage of tight gas reservoirs. Influence law of residual gas

Method used

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  • Single-well control reserve calculation and residual gas analysis method for low-permeability tight gas reservoir
  • Single-well control reserve calculation and residual gas analysis method for low-permeability tight gas reservoir
  • Single-well control reserve calculation and residual gas analysis method for low-permeability tight gas reservoir

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0149] Embodiment 1, taking the D1-4 well as an example, analyze the calculation process of the method:

[0150] Well D1-4 is located in the north-central part of Block D1, and started production in July 2005. The production layer is H3-1 layer, and the production layer is 2665m to 2670m. The average porosity of this layer near this well is 12.18%. , the average original permeability is 1.17mD. As of December 2016, wells were shut down for 48 days, and the maximum daily gas production was 1.99×10 4 m 3 / d, the average daily gas production is 0.75×10 4 m 3 / d, cumulative gas production is 0.31×10 8 m 3 .

[0151] The parameters of well D1-4 and the production interval required to participate in the calculation are shown in Table 1. When the permeability is greater than 0.1mD, the slippage effect item in formula (14) can be ignored.

[0152] Table 1: Related parameters of Well D1-4 and the interval produced

[0153]

[0154] Daily gas volume q sc (Unit: 10 4 m 3 / d...

Embodiment 2

[0177] Embodiment 2, influence factors of reserves calculation

[0178] 1. Starting pressure gradient

[0179] In order to study the influence of the threshold pressure gradient on the calculation results of the controlled reserves of a single well, taking Well D1-4 as an example, the maximum permeability damage rate D k3 =22.68%, so that the starting pressure gradient c=0, 0.005, 0.01, 0.02, 0.03, 0.05, 0.08, 0.1, 0.2, 0.3MPa / m in the (14) formula, to obtain the corresponding starting pressure gradient with G p relationship curve as Figure 7 shown.

[0180] By extending each regression line to the abscissa axis, the corresponding dynamic single-well control reserve value under each start-up pressure gradient can be obtained, as shown in Table 2 and Figure 8 shown.

[0181] Table 2: Corresponding dynamic single well control reserve value under each threshold pressure gradient

[0182]

[0183] Such as Figure 8 As shown in the table above, when c<0.02MPa / m, the th...

Embodiment 3

[0192] Example 3, Summary of Calculation of Single Well Controlled Reserves in Block D1

[0193] The controlled reserves of 52 wells in Block D1 are now summarized, as shown in Table 4. Among them, "-" indicates that for a certain well, the error of the method is relatively large or the data does not meet the calculation conditions.

[0194] Table 4: Summary of calculation results of single well controlled reserves of 52 wells in block D1 (unit: 10 8 m 3 )

[0195]

[0196]

[0197] According to Table 2, the total controlled reserves of each single well in block D1 is 30.083×10 8 m 3 .

[0198] The single well controlled reserves of 52 wells in Block D1 were calculated by dynamic method, including 45 wells by material balance method, 46 wells by Fetkovich typical curve method, 52 wells by Blasingame production decline method, and Agarwal- 44 wells were calculated by the Gardner production decline method, 47 wells were calculated by the flow material balance method,...

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Abstract

The invention belongs to the technical field of oil and gas field development, and discloses a single-well control reserve calculation and residual gas analysis method for a low-permeability tight gasreservoir, and the method comprises the steps: carrying out the single-well control reserve calculation of each gas well of a block through a gas reservoir dynamic reserve calculation method; establishing a new reserve calculation formula for solution and instance comparative analysis; quantitatively analyzing the influence of the starting pressure gradient and the stress sensitivity on the single-well control reserve calculation result; after analysis of influence factors of the reserve calculation result, obtaing a result that when the starting pressure gradient reaches 0.02 MPa / m, the reserve calculation result is significantly reduced compared with a conventional method, but after the starting pressure gradient is greater than 0.1 MPa / m, the influence degree gradually tends to be stable; the stronger the reservoir stress sensitivity is, the smaller the reserve calculation result is. The embodiment of the invention shows that the method has good theoretical and practical application values for accurately determining the single-well control dynamic reserves of the low-permeability tight gas reservoir.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, and in particular relates to a method for calculating the controlled reserve of a single well in a low-permeability tight gas reservoir and analyzing the remaining gas. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: [0003] Natural gas has the characteristics of high combustion calorific value, high utilization efficiency and high economic value. With the increasing production of low-permeability tight gas reservoirs, it has become an important part of natural gas production in my country and even the world, and the calculation of gas reservoir reserves is very important in the process of gas reservoir development. Its accurate evaluation and development plan of gas reservoirs It plays a very important role in the formulation of the model and the late numerical simulation reserve fitting. Due to the poor ph...

Claims

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Application Information

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IPC IPC(8): G06F17/50E21B49/00
CPCE21B49/00G06F30/20E21B47/06E21B43/00E21B41/00E21B2200/20Y02A10/40
Inventor 乐平王国壮高青松刘东晨雷涛任光磊谢志伟
Owner SOUTHWEST PETROLEUM UNIV
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