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ORIGINAL RESEARCH article

Front. Energy Res., 10 May 2024
Sec. Advanced Clean Fuel Technologies
This article is part of the Research Topic Production Technology for Deep Reservoirs View all 37 articles

The Blasingame method considering the effect of inter-well interference in a circular homogeneous closed reservoir

Pengfei DuPengfei Du1Qi WangQi Wang2Jing ZhangJing Zhang2Yanwei WangYanwei Wang1Dong WangDong Wang1Yi HanYi Han1Pengcheng Liu
Pengcheng Liu1*
  • 1School of Energy Resources, China University of Geosciences, Beijing, China
  • 2Research Institute of Petroleum Exploration and Development of CNPC, Beijing, China

The Blasingame method is a valuable tool for analysing the diminishing production challenge in the presence of variable bottomhole pressure and diverse production conditions. It is essential to highlight that the Blasingame method views the closed reservoir as the outer boundary condition for its model. This paper introduces the concept of the equivalent well control radius and formulates the Blasingame method based on the fluid flow characteristics inherent in twin-well production, taking into account the influence of inter-well interference. This study provides an in-depth analysis of production variations in reservoirs with inter-well interference by examining Blasingame type-curve definitions of the dimensionless parameters. Additionally, it investigates key factors impacting production, including neighbouring wells’ production, distance, and opening time: variations in all three parameters lead to different levels of interference between wells, which manifests itself in the regularised production integral derivative curve with different lengths and heights of convexity. Numerical simulations employing orthogonality are conducted to validate the reliability of this method. The results of these simulations offer theoretical support for the precise evaluation of reservoirs facing similar challenges.

1 Introduction

In reservoirs with strong inter-well connectivity, neighbouring well interference can significantly impact test well pressures during the declining development process (Yuan and Wang, 2013; Guo et al., 2022; Wang et al., 2023). It has been well-established that reservoir dynamic description techniques, centred on single-well test well analysis and modern declining production analysis techniques, are effectively applied in reservoirs characterised by small single-well control ranges and poor inter-well connectivity (Zhang, 2004). However, reservoirs with high permeability and good connectivity are often multi-well systems (Zhang et al., 2006; Lin and Yang, 2007; Li and Luo, 2009). Therefore, interpreting such reservoirs using a single-well dynamic description can be misleading (Pang et al., 2012; Gan et al., 2022; Wang et al., 2023). Currently, the industry typically employs the superposition principle method to study the dynamic information of test wells in a multi-well system with inter-well interference (Onur et al., 1991; Li et al., 1994; Zhou et al., 2022). Jiaen Lin, Qiguo Liu, and Yonglu Jia demonstrated the late ‘upward curvature’ of the pressure recovery derivative curve in test wells by using the well test analysis technique (Dong and Zhai, 1996; Lin et al., 1996; Liu et al., 2002; Lin and Yang, 2005b; Liu et al., 2006; Jia et al., 2008; Deng et al., 2015). Hedong Sun provided a theoretical proof of this phenomenon while establishing an analysis method for multi-well pressure recovery test wells under neighbouring well interference conditions (Sun, 2016; Alarji. H et al., 2022). With the deepening of research, many scholars have explored the multi-well production model under the influence of multiple factors. Zeng Yang established a model for interpreting well tests in injection wells that consider interference from neighbouring wells (Zeng Y et al., 2020; Zhao et al., 2022). Cao established a well test interpretation model for finite inflow fractured wells under multi-well interference (Wei et al., 2022b).

The analytical solution of the multi-well production model discussed in previous studies is primarily used for analysing test wells (Jiang et al., 2019; Chen, 2023). The model assumes an infinite reservoir as the outer boundary condition, which simplifies the analysis. This paper introduces a closed reservoir as the outer boundary condition, introduces the ‘normalisation factor’, and applies the model’s solution to the Blasingame-type curves (Chen et al., 2017; Xu et al., 2021).

Modern methods of diminishing yield analysis and well test analysis are based on the classical seepage basis, but the two methods use different accuracy of evaluation data in the analysis process (Sun, 2013; Spivey, 2016; Wei et al., 2022a). Modern methods of diminishing yield analysis require less precision in the data and are, therefore, less difficult and costly to obtain. Blasingame and others creatively introduced the proposed time of material equilibrium and regularised yields to establish a plate of decreasing curves called the Blasingame plate (Mccray, T.L, 1990; Palacio and Blasingame, 1993). It is epoch-making in the modern analysis of diminishing yield.

2 Modelling and solving

Figure 1 shows a circular stratigraphic well deployment map.

Figure 1
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Figure 1. Circular stratigraphic well deployment map.

From Figure 1, the middle point of a circular formation with supply radius re and closed outer boundary, there is a well P-1 producing at a constant yield qi, while at point B, there is another well P-2 producing at a yield q2, and the distance from point A to point B is L.

Other assumptions are as follows: the reservoir is homogeneous and isotropic, with impermeable boundaries above and below; the reservoir pores are filled with a single-phase, micro-compressible fluid, and the flow is in accordance with Darcy’s law; the effect of gravity is neglected; and the effects of the skin effect and the wellbore storage effect are not considered.

2.1 Equivalent well control radius

The pull-down spatial pressure solution for point A of the double-well production, Eq. 1, can be obtained according to the Duhamel superposition principle (Wang, 2015):

PA=P1A+P2A,(1)

where PA is the pressure solution at point A when both wells are producing, P1A is the pressure solution at point A when well P-1 is producing alone, and P2A is the pressure solution at point A when well P-2 is producing alone.

When L tends to 0, the pressure response of the unsteady seepage stage at point A is equivalent to the pressure response of well P-1 when it produces individually at a constant production rate qi+q2, and the unsteady flow stage exhibits radial flow characteristics. When L is large, qi=q2, and P1A > P2A, the flow characteristics of the unstable seepage stage at point A are dominated by the flow characteristics of the unstable seepage stage at point A when well P-1 is producing alone.

Figure 2 shows a conceptual diagram of the reD2 solution. Overall, in Figure 2, the flow stage at point A, when the two wells are producing, can be simplified as the infinite radial flow stage, the proposed steady-state stage. In turn, the pressure solution at point A when well P-2 is producing alone can be simplified as the pressure solution for one well in the centre of a circular closed reservoir with constant production, while the simplified well control radius expression for well B is given in this paper.

Figure 2
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Figure 2. Conceptual diagram of the reD2 solution.

The average of the distances from point B to the circular closure boundary at the simplified drain radius is as follows:

reD2=02πreDsinθ2+reDcosθ+r12dθ2π,(2)
r1=Lrw,(3)
reD=rerw,(4)

where reD is the radius of the circular closed reservoir and rw is the radius of the wellbore.

From Eqs 24, we can derive reD2reD (take the equal sign when L = 0), so the reservoir reaches the proposed steady-state flow stage later when P-2 is producing alone than when well P-1 is producing alone, which is in line with the actual flow condition.

Table 1 lists the equivalent well control radius error rating table. After obtaining the simplified well control radius using this method, the corresponding equivalent well control area is further calculated and compared with the actual well control area. It is found that the simplified well control area is more accurate at r1<0.5reD.

Table 1
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Table 1. Equivalent well control radius error rating table.

2.2 Modelling

The fixed solution problem for p-1 wells can be described as follows:

2pDrD2+1rDpDrD=pDtD,(5)
pDtD=0=0,(6)
rDpDrDrD=1=1,(7)
pDrDrD=reD=0,(8)
p1A=pD1,tD.(9)

The fixed solution problem for p-2 wells can be described as follows:

2pDrD2+1rDpDrD=pDtD,(10)
pDtD=0=0,(11)
qB=q2qi,(12)
rDpDrDrD=1=qB,(13)
pDrDrD=reD=0,(14)
p2A=pDr1,tD.(15)

The dimensionless variables are defined as follows:

pDrD,tD=kh1.842×103Bqiμpipr,t,tD=3.6ktμCtrw2,rw=rrw,reD=rerw,reD2=02πreDsinθ2+reDcosθ+r12dθ2π,

where r is the distance from any point to the well in mm, rw is the wellbore radius in mm, re is the drain radius in mm, k is the reservoir permeability in µm2, θ is the reservoir porosity with no causality, Ct is the total reservoir compression factor in MPa−1, h is the thickness of the reservoir in mm, μ is the viscosity of the crude oil in MPa·s, B is a crude oil volume factor with no factorisation, q is the surface production of the well in m3/d, pi is the original stratigraphic pressure in MPa, p is the formation pressure at a point in the reservoir at a given time in MPa, and t is production time in h.

2.3 Solution of the mathematical model

A Laplace transformation of Eqs 515 yields

2pDrD2+1rDpDrD=spD.(16)

The boundary conditions within the P-1 well are expressed as

pDrDrD=1=1s.(17)

The boundary conditions within the P-2 well are expressed as

pDrDrD=1=qBs,(18)
pDrDrD=reD=0.(19)

Substituting Eq. 16 and Eq. 17 into Eq. 19, we have Eq. 20

p1A=1s32K0sI1reDs+I0sK1reDsK1sI1reDsI1sK1reDs.(20)

Substituting Eq.16 and Eq.18 into Eq. 19, we have Eq. 21

p2A=qBs32K0r1sI1re1Ds+I0r1sK1re1DsK1sI1re1DsI1sK1re1Ds.(21)

Eq. 22 can be obtained from the Duhamel superposition principle:

pA=p1A+p2A.(22)

3 Plotting Blasingame-type curves

Plots of the rate solution qD under a constant BHFP and the reciprocal of the pressure solution at a constant rate (1/pD) in the coordinate system are shown in Figure 3A. The figure indicates that the two curves almost overlap in the transient flow period and are dispersed in the boundary-dominated flow period. Palacio and Blasingame (1993) replaced dimensionless time tD with dimensionless material balance time tcD and plotted the above curves again. The result shows that the two curves overlap, as shown in Figure 3B. In other words, the solutions of variable flow rate and constant flow rate are equivalent due to the introduction of material balance time tcD. Therefore, the Blasingame method is applicable to the condition of a variable BHFP and also to the condition of a variable flow rate (Liu, 2010; Yu, 2020).

Figure 3
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Figure 3. Comparison of fixed production pressure inverse, fixed production output, and fixed production material balance time output curves (A). qD, 1/pD vs. tD curve; (B). qD and 1/pD vs. tD, qD vs. tcD curve (Hedong Sun, 2015).

3.1 Blasingame-type curve definitions of the dimensionless parameters

Blasingame-type curve definitions of the dimensionless parameters are formed by introducing normalisation coefficients, α, to the original definition of the dimensionless parameter.

Here, Blasingame-type curve definitions of the dimensionless parameters are as follows:

Define the dimensionless material balance time as Eq. 23

tDd=112reD21lnreD12tD.(23)

Define the dimensionless decline flow rate Eq. 24

qDd=1+qBlnreD12L1pA.(24)

Define the dimensionless cumulative production as Eq. 25

NpDd=0tDdqDdτdτ.(25)

Define the dimensionless decline flow rate integral function as Eq. 26

qDdi=0tDdqDdτdτtDd=NpDdtDd.(26)

Define the dimensionless decline flow rate integral derivative as Eq. 27

qDdid=dqDdidlntDd=qDdiqDd.(27)

3.2 Blasingame-type curves and model validation

Figure 4 shows an unstable analysis curve of production from double straight wells in homogeneous reservoirs. From Figure 4, taking reD = 5,000 and qB = 4 as an example, the crude oil flow can be roughly divided into an early radial flow stage, a stage influenced by the interference of neighbouring wells, and a later stage when the influence of the interfering wells is weakened (unsteady flow stage). The following section addresses the effect of well spacing, neighbouring well production, and neighbouring well start time factors on the Blasingame curve.

Figure 4
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Figure 4. Unstable analysis curve of production from double straight wells in homogeneous reservoirs.

3.2.1 Effect of well spacing

Figure 5 shows the effect of different distances between two wells on the Blasingame curve when two wells in a circular homogeneous confined reservoir are producing at the same rate with simultaneous fixed production. From Figure 5, the early unstable flow stage of typical curves is a set of curves corresponding to different dimensionless well spacings, r1. In the case of simultaneous production with the same yield, r1 only affects the characteristics of the prior curve. When the pressure response from production from well P-2 has not yet reached point A, the curve is parallel to the curve when well p-1 is producing alone. When the pressure response from production in well P-2 reaches point A, inter-well interference occurs, and the regularised production curve begins to deviate downward. The larger the r1, the greater the time for the material to begin to deviate from equilibrium, and the smaller the degree of tDd deviation, eventually converging in the boundary control flow stage into a straight line with a slope of −1, which corresponds to the characteristics of the curve of the proposed steady-state flow of the p-1 well when it is producing alone at a constant production rate 2qi. The variation in the integral curve with the regularised yield is similar to that of the regularised yield curve, which is grouped into a single curve at a later stage. For the regularised yield integral derivative curves, the inter-well disturbances during the unsteady seepage phase make them convex, and the larger r1 is, the later the convexity appears, the lower and narrower the convexity is, and the later it is reduced to a single curve.

Figure 5
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Figure 5. Effect of different distances between two wells on the Blasingame curve when two wells in a circular homogeneous confined reservoir are producing at the same rate with simultaneous fixed production (A) Mixed plates; (B) Comparison of model solution at r1=1 with single well production model solution.

Let r1 be 1; the two wells overlap as one well on the model, and the Blasingame type-curves coincide exactly with that of the single-well model. The correctness of the above dimensionless pressure-fitting regularised yield solution is proved.

3.2.2 Effect of well spacing

Figure 6 shows the effect of Blasingame curves on P-2 delayed production from twin wells in circular homogeneous confined reservoirs producing at the same rate of constant production. Typical curves are a set of curves corresponding to the different dimensionless material balance time delays of P-2 wells (with fixed production rates, denoted as qi) during the opening of the well. For the same production rate and constant well spacing, the larger is tp, the greater the time for downward deviation of the regularised production curve, which eventually converges into a straight line with a slope of −1 at the boundary control flow stage, corresponding to the curve characteristic of the proposed steady-state flow of the P-1 well when it is producing alone at a constant production rate of 2qi. For the regularised yield integral curve, the variation with tp is similar to that of the regularised yield curve, but the larger tp, the later the curve is shifted upward in parallel. For the regularised yield integral derivative curves, inter-well disturbances during the unsteady seepage phase make them convex, and the larger tp is, the later the convexity appears, the lower and narrower the convexity is, and the later curves are shifted upward in parallel.

Figure 6
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Figure 6. Effect of Blasingame curves on P-2 delayed production from twin wells in circular homogeneous confined reservoirs producing at the same rate of constant production.

3.2.3 Effect of production size of neighbouring wells

Figure 7 shows the effect of Blasingame curves in circular homogeneous closed reservoirs with two wells producing P-2 at different rates at the same time. Figure 7 shows that the type curves are a set of curves corresponding to the production of P-2 wells of different unfactored times. Under the condition of simultaneous production with the same well spacing, the larger qB is, the higher the regularised production curve is, the smaller the time of downward deviation is, the larger the degree of deviation is, and finally, a straight line with a slope of −1 converges at the stage of boundary control flow. For the regularised yield integral curve, the variation with qB is similar to that of the regularised yield curve, but the larger qB, the later the curve is shifted downward in parallel. For the regularised production integral derivative curve, the inter-well interference during the unsteady seepage phase makes it convex, and the larger qB is, the faster the propagation of the pressure due to the production of the P-2 well is, the earlier the curve convexity appears, and the higher the convexity is.

Figure 7
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Figure 7. Effect of Blasingame curves in circular homogeneous closed reservoirs with two wells producing P-2 at different rates at the same time (A) Mixed plates; (B) Comparison of model solution at qB=0 with single well production model solution.

Let qB=0. Only well P-1 is producing in the model, and the Blasingame curve of its model solution coincides exactly with that of the single-well model, that is, the correctness of the above dimensionless fitted-pressure regularised production solution is proved again.

4 Comparative analysis of numerical simulations

Figures 8, 9 show the reservoir pressure map and plot of the bottomhole pressure, production, and cumulative production over time for the centre point wells.

Figure 8
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Figure 8. Reservoir pressure map (A) 2023/11/21; (B) 2024/1/15.

Figure 9
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Figure 9. Plot of bottomhole pressure, production, and cumulative production over time for centre-point wells (A). pw-t; (B). qo-t; (C). No-t.

From Figures 8, 9, tNavigator software was used to establish a 2000 m × 2000 m × 20 m reservoir 3-D model, with a grid step of 5 m, net-to-gross ratio of 0.1, porosity of 0.1, X-axis permeability of 100 mD, X-axis permeability of 100 mD, Z-axis permeability of 10 mD, an initial pressure of 80 MPa, a support depth of 110 m, a single-component model, a well at the centre point producing at a fixed rate, and another well at the grid coordinates (100, 100, 1) producing at the same rate, and two wells producing at the same time, and obtaining the data on the bottomhole pressure, the production rate, and the cumulative production rate of the wells at the centre point with the change of time.

4.1 Data processing

To regularise the resultant data from numerical model runs,

Calculate the material balance time by Eq. 28

tc=Npq.(28)

Calculate the normalised rate by Eq. 29

qp=qpipwf.(29)

Calculate the normalised rate integral by Eq. 30

qpi=1tc0tcqpipwfdx.(30)

Calculate the normalised rate integral derivative by Eq. 31

qpid=tcdqpidtc.(31)

Table 2 is the numerical simulation data–production data regularisation table.

Table 2
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Table 2. Numerical simulation data–production data regularisation table.

4.2 Data fitting

Figure 10 shows measured curve fitting results from plotting the three relational curves, qd-tc, qdi-tc, and qdid-tc, fitting the Blasingame yield instability analysis plate, and recording the fitted values, where the three relational curves can be used simultaneously or individually.

Figure 10
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Figure 10. Measured curve fitting results (A) material balance curve of well production history; (B) fitted plot of measured data.

Using the theoretical fit points (8 × 10−3, 0.4), the actual fit points can be obtained (1, 0.7).

The dynamic reserve at the centre point can be calculated according to the following Eq 32:

N=1CttctDdMq/pqDdM1Sw(32)

as 3.65×106 m3, and the numerical model has a reserve of 7.68×106 m3.

Additionally, the flowing material balance method (FMB) is listed for comparison to verify the accuracy of the method used in this article.

Figure 11 shows the equilibrium curves for the flowing material balance.

Figure 11
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Figure 11. Fluid substance balance analysis diagram.

FMB is a method similar to the traditional material balance equation. However, it differs from the traditional material balance equation in that it uses dynamic pressure data instead of static pressure data for storage evaluation. Additionally, it differs from the flow material balance method, which uses flow pressure for dynamic storage evaluation. Once the reservoir is producing and has achieved a steady-state flow, the following relationship can be established (Eq. 33):

qp=NpbpssNpCt+1bpss.(33)

The dynamic reserves N can be determined from the intercept results if the qpNppCt curve is plotted.

From Figure 11, the dynamic reserves calculated for the P-1 well’s reservoir are 3.486×106 m3. Comparing the results of the two methods, it is found that the method in this paper is more accurate in its calculations.

5 Conclusion

In this paper, the dual-well model is solved analytically by the equivalent well control radius method, and the following conclusions are reached:

(1) Based on establishing a constant production model that takes into account the effect of the presence of inter-well interference, the method of equivalent well control radius is used to simplify the treatment of the external boundary conditions of neighbouring wells that are not at the centre point of a circular closed reservoir. The range of applicability of the method is verified by comparing the equivalent well control surface with the actual well control area, and it is found that the method is more accurate when r1<0.5reD.

(2) Based on the method of equivalent well control radius, a sensitivity analysis of the Blasingame curve for the dual-well model can be conducted with respect to the parameters of adjacent well production, well spacing, and adjacent well opening time: the Blasingame normalised dimensionless decline flow rate integral curve is shifted downward when inter-well interference occurs, returning to a straight line later in the season. The Blasingame normalised dimensionless decline flow rate integral curve is shifted downward in the early stage, and the shape of the curve in the later stage is determined by the parameters. The Blasingame normalised dimensionless decline flow rate integral derivative curve has convex bulges, and the higher the degree of interference between the wells, the higher the bulges are, and the earlier they appear.

(3) Using the double-well production Blasingame curve plate for decreasing production analysis, the interpreted dynamic reserve results are more accurate for reservoirs with inter-well interferences, and the method in this paper can provide technical support for the fine evaluation of such reservoirs.

(4) Shortcomings: At present, the method is only applicable to analytical solutions and is used under the condition that r1 (distance between wells) > reD (actual well control radius). This is somewhat inapplicable to more complex models, such as composite media models, and requires further investigation.

Data availability statement

The original contributions presented in the study are included in the article/supplementary materials; further inquiries can be directed to the corresponding author.

Author contributions

PD: writing–original draft. QW: writing–review and editing. JZ: writing–review and editing. YW: writing–review and editing. DW: supervision and writing–review and editing. YH: software, supervision, and writing–review and editing. PL: validation and writing–review and editing.

Funding

The author(s) declare financial support was received for the research, authorship, and/or publication of this article from The National Natural Science Foundation of China (Grant No. 52074344).

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher’s note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors, and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

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Keywords: twin-well production, mobile phase, equivalent well control radius, Blasingame-type curves, declining yield curve, explanatory plate

Citation: Du P, Wang Q, Zhang J, Wang Y, Wang D, Han Y and Liu P (2024) The Blasingame method considering the effect of inter-well interference in a circular homogeneous closed reservoir. Front. Energy Res. 12:1376848. doi: 10.3389/fenrg.2024.1376848

Received: 26 January 2024; Accepted: 20 March 2024;
Published: 10 May 2024.

Edited by:

Yan Peng, China University of Petroleum, Beijing, China

Reviewed by:

Yilong Yuan, Jilin University, China
Yuhao Zhou, China University of Petroleum (East China), China

Copyright © 2024 Du, Wang, Zhang, Wang, Wang, Han and Liu. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Pengcheng Liu, bHBjQGN1Z2IuZWR1LmNu

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