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A method for predicting the advancing distance of acidizing fluid for temporary plugging in horizontal wells

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

Active Publication Date: 2016-05-18
SOUTHWEST PETROLEUM UNIV
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  • Claims
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AI Technical Summary

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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  • A method for predicting the advancing distance of acidizing fluid for temporary plugging in horizontal wells
  • A method for predicting the advancing distance of acidizing fluid for temporary plugging in horizontal wells
  • A method for predicting the advancing distance of acidizing fluid for temporary plugging in horizontal wells

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Embodiment 1

[0086] Well X-2H and Well X-4H are located in the same block. The target formations of the two wells have similar physical properties and belong to the same pressure system. The reservoir thickness is 37-41m. The reservoir of Well 4H encountered the target layer at a depth of 6914m, with a horizontal section length of 1548m and a horizontal wellbore radius of 0.065m. A -2H well is an acidification well in the early stage, and the concentration of the acid solution used is 28kg / m 3 , pump displacement 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. Using this method to analyze and calculate, the acid liquid advancing distance is 1287m, which is less than the length of the horizontal section. After summarizing experience and lessons, the present invention is used to carry out acidification design for a -4H well: the designed amount of temporary plugging ag...

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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 the development of oil and gas fields, and in particular relates to a method for predicting the advancing distance of temporarily plugging acidizing acid fluid in horizontal wells, and is especially suitable for horizontal wells in the form of liner pipe or screen pipe completion. Background technique [0002] Reservoir matrix acidizing (referred to as acidizing) is the injection of acid fluid into the wellbore after oil and gas well cementing, so that it will chemically react with the solid phase of the drilling and completion fluid remaining in the reservoir pores in the near-wellbore zone and the reservoir rock, and dissolve Some solids, engineering measures to improve the porosity and permeability characteristics of reservoirs near the wellbore to realize oil and gas well stimulation. [0003] Nowadays, horizontal wells occupy an increasing share in oil and gas production, but the dri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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