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Horizontal well horizontal section relative sand outlet deficit profile prediction and sand prevention section grading method

A grading method and horizontal section technology, applied in the field of oil and gas exploration, can solve the problems of affecting the output of oil and gas wells, unfavorable economic benefits, and different degrees of sand production, and achieve the effects of ensuring long-term stable production, improving economic benefits, and improving sand control effects

Active Publication Date: 2018-07-27
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the length of the horizontal section of the horizontal well is long, the reservoir homogeneity is poor, and the degree of sand production in each well section is different, which increases the complexity of sand control construction
However, due to the difficulty of predicting the sand production position and profile in the long horizontal section of horizontal wells, it is difficult to carry out targeted sand control according to the serious sand production interval. Only general sand control in the whole well section will increase the cost and affect the production of oil and gas wells, and it is difficult to obtain The ideal comprehensive sand control effect is not conducive to improving economic benefits

Method used

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  • Horizontal well horizontal section relative sand outlet deficit profile prediction and sand prevention section grading method
  • Horizontal well horizontal section relative sand outlet deficit profile prediction and sand prevention section grading method
  • Horizontal well horizontal section relative sand outlet deficit profile prediction and sand prevention section grading method

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Effect test

Embodiment 1

[0077] A method for predicting the relative sand production deficit profile of the horizontal section of a horizontal well and for sand control segmentation classification, comprising:

[0078] S1: According to the horizontal well logging data (density logging, compressional wave logging, shear wave logging) to calculate the distribution of reservoir rock mechanics parameters along the horizontal section of the horizontal well, the reservoir rock mechanics parameters include dynamic Poisson's ratio, static Poisson's ratio , dynamic elastic modulus, uniaxial compressive strength, cohesion and internal friction angle;

[0079] The calculation formula of dynamic Poisson's ratio is shown in formula (I):

[0080]

[0081] In formula (Ⅰ), μ d — dynamic Poisson’s ratio of rock, dimensionless; Δt h — S-wave time difference, μs / m; Δt v — longitudinal wave time difference, μs / m;

[0082] The calculation formula of static Poisson's ratio is shown in formula (II):

[0083] μ=A·μ ...

Embodiment 2

[0121] The relative sand production deficiency profile prediction and sand control segmentation method of a horizontal well horizontal section described in Example 1 is used. This method is applied to the horizontal section of a horizontal well in a certain oil reservoir in Dagang Oilfield. The horizontal section of the horizontal well is 580m long and has a water cut of 85. %, liquid production is about 180t / d. Utilize the method of Example 1 to predict and obtain the critical sand production pressure difference, production pressure difference, and sand production net pressure difference distribution schematic diagram of the horizontal section as shown in Image 6 shown. The schematic diagram of multi-segment and multi-level division results of graded sand control in horizontal section is as follows Figure 7 shown.

[0122] According to the evaluation results, the sand production and sand control of the entire horizontal section is divided into 8 sections, such as Figure...

Embodiment 3

[0124] A method for predicting the relative sand production deficit profile of the horizontal section of a horizontal well and segmented sand control classification method described in Example 1 is used. This method is applied to the horizontal section of a horizontal well in a heavy oil reservoir in Shengli Oilfield. The horizontal section of the horizontal well passes through three layers, and the horizontal section lengths are 25m, 35m and 400m respectively.

[0125] Utilize the method of embodiment 1 to predict and obtain the sand production profile of the horizontal section and the subsection sand control evaluation results as follows Figure 8 shown. According to the evaluation results, the first layer section A is a moderate sand production section, which requires secondary sand control; the second layer B section is a slight sand production section, which requires primary sand control; the third layer C, E, and G are medium The well section with sand production requir...

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Abstract

The invention relates to a horizontal well horizontal section relative sand outlet deficit profile prediction and sand prevention section grading method which comprises the steps that S1, distributionof reservoir rock mechanical parameter along the horizontal well horizontal section is calculated; S2, sand outlet critical production pressure difference distribution of the horizontal well horizontal section is predicted; S3, the actual bottomhole flowing pressure and the actual production pressure difference of all points of the horizontal section are calculated, and the bottomhole flowing pressure, namely, the bottomhole flowing pressure at the root end of the horizontal section is calibrated; S4, sand outlet net pressure difference is calculated, and dimensionless calculation is conducted to obtain a sand outlet strength index; S5, a relative sand outlet profile map of a horizontal well is drawn, the sand outlet deficit degree grade is divided, and he sand outlet degree is sectioned;and S6, the section grading scheme for section grading sand prevention is determined. Section grading sand prevention is guided by relative sand outlet profile prediction, the problem that general sand prevention of the horizontal well is high in blindness and poor in sand prevention effect is solved, the cost of sand prevention operation is reduced, long-term stable production of the horizontalwell is guaranteed, and economic benefits are increased.

Description

technical field [0001] The invention relates to a method for predicting the relative sand production deficit profile of a horizontal section of a horizontal well and a sand control segmental classification method, which belongs to the technical field of oil and gas exploration. Background technique [0002] Unconsolidated sandstone oil and gas resource reserves account for a relatively large proportion in the world and in China, with huge development potential. Horizontal well production technology is widely used in the production of oil and gas reservoirs, especially unconsolidated sandstone oil and gas reservoirs, because of its large oil drainage area, fast oil production speed, and effective mitigation of bottom water coning. It is an important technical means for the development of new oil fields and tapping the potential of old oil fields. [0003] Due to the poor cementation degree of unconsolidated sandstone reservoir rocks, sand production is often accompanied by va...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/00
CPCE21B47/00
Inventor 董长银周玉刚闫切海刘永红尚校森李志芬钟奕昕
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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