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Method for forecasting temporary plugging acidization acid liquor advancing distance of horizontal well

A technology of advancing distance and horizontal well, which is applied to horizontal wells with liner or screen completion, predicting the advancing distance of acidizing acid fluid for temporary plugging of horizontal wells, and can solve problems such as unsatisfactory acidizing effect.

Active Publication Date: 2015-10-07
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

Due to the blindness and risk of the current horizontal well acidizing mostly based on experience, it often leads to unsatisfactory acidizing effects

Method used

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  • Method for forecasting temporary plugging acidization acid liquor advancing distance of horizontal well
  • Method for forecasting temporary plugging acidization acid liquor advancing distance of horizontal well
  • Method for forecasting temporary plugging acidization acid liquor advancing distance of horizontal well

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Embodiment 1

[0086] A -2H well and a -4H well are located in the same block. The physical properties of the target layers of the two wells are similar and belong to the same pressure system. The reservoir thickness is 37-41m. The reservoir of Well 4H encountered the target layer depth of 6914m, the horizontal section was 1548m long, and the horizontal wellbore radius was 0.065m. A -2H well is an acidizing well in the early stage, and the acid concentration used is 28kg / m 3 , the pump displacement is 4m 3 / min, the amount of temporary plugging agent is 1425kg, and the output has increased to a certain extent after construction, but the effect is not very satisfactory. According to the analysis and calculation of this method, the acid liquid propelling distance is 1287m, which is less than the length of the horizontal section. After summarizing the experience and lessons, the present invention is used to carry out the acidizing design of a -4H well: the designed dosage of temporary pluggin...

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Abstract

The invention discloses a method for forecasting temporary plugging acidization acid liquor advancing distance of a horizontal well. The method comprises the following steps of (1) obtaining core parameters and permeability distribution of horizontal well section reservoir stratums, (2) establishing a calculation model of acid liquor advancing distance to obtain intermediate parameters needed for forecasting horizontal well acidization acid liquor advancing distance, and (3) forecasting the temporary plugging acidization acid liquor advancing distance of the horizontal well according to the parameters obtained in the step (1) and the step (2). The method can simulate the shaft acid liquor dynamic state in the construction process, can accurately forecast temporary plugging acidization acid liquor advancing distance of the horizontal well according to construction designed displacement, temporary plugging agent dosage and properties and reservoir parameters, and blank of existing technology is filled up.

Description

technical field [0001] The invention belongs to the field of reservoir acidification in oil and gas field development, and particularly relates to a method for predicting the advancing distance of acidified acid liquid for temporary plugging of horizontal wells, especially suitable for horizontal wells with liner pipe or screen pipe completion methods. Background technique [0002] Reservoir matrix acidification (referred to as acidification) is a chemical reaction with the solid phase of drilling and completion fluid and reservoir rocks remaining in the pores of the reservoir near the wellbore by injecting acid into the wellbore after oil and gas well cementing. Part of the solid, engineering measures to improve the porosity and permeability characteristics of the reservoir near the wellbore to realize the stimulation of oil and gas wells. [0003] Nowadays, horizontal wells occupy a larger and larger share of oil and gas production, but their drilling and completion constr...

Claims

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Application Information

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IPC IPC(8): E21B43/27E21B49/00
Inventor 赵金洲孔烈武恒志王世泽戚斌刘林王兴文张国东李勇明
Owner SOUTHWEST PETROLEUM UNIV
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