一种新型泡点压力预测模型的建立和应用——以塔里木油区为例

doi:10.13809/j.cnki.cn32-1825/te.2022.06.012

摘要/Abstract

摘要：

地层原油泡点压力（p_b）是确定油藏类型、制定油藏开发方案和进行油藏工程计算必不可少的重要参数，也是计算油田储量及选择油井工作制度的基础。为了方便、快速预测油藏流体泡点压力值，在大量PVT（高压物性）实验测试数据基础上，对深层复杂油藏流体确定泡点压力值的经验模型进行了描述，分析并确定了影响塔里木油区深层复杂油气藏地层原油泡点压力值的主控因素，建立了一种快速预测油藏流体泡点压力的模型。基于塔里木油区132组样品数据，利用数模软件进行回归分析，得出了泡点压力新模型的10个影响因素和相关参数的取值，并通过对后续10支地层流体样品的补充PVT实验数据进行实例验证。对比已有经验公式，该预测模型具有更好的预测效果。

关键词: 复杂油藏, 泡点压力, 共轭梯度, 经验公式, 拟合对比

Abstract:

Bubble point pressure（p_b） is an essential parameter for determining reservoir type, formulating reservoir development scheme and reservoir engineering calculation. It is also the basis for calculating oilfield reserves and selecting oil well working system. In order to conveniently and rapidly predict the bubble point pressure value of reservoir fluid, the empirical model for determining the bubble point pressure value of deep complex reservoir fluid is described based on a large number of PVT high-pressure physical property test data. And the main controlling factors affecting the bubble point pressure of oil in deep complex reservoir of Tarim oildom are analyzed and determined. Meanwhile, A model for rapid prediction of reservoir fluid bubble point pressure is established. Based on 132 groups of sample data in Tarim oil area, the regression analysis is carried out by using digital simulation software, and the values of 10 influencing factors and related parameters of the new bubble point pressure model are obtained. It is verified by the supplementary PVT experimental data of 10 subsequent formation fluid samples. Compared with the existing empirical formula, the prediction model has better prediction effect.

Key words: complex reservoirs, bubble point pressure, conjugate-gradient, empirical formula, fitting and contrast

中图分类号:

TE344

王佳营,赵仁保,李姝璇,贾瑜,付宁,齐双瑜. 一种新型泡点压力预测模型的建立和应用——以塔里木油区为例[J]. 油气藏评价与开发, 2022, 12(6): 927-934.

WANG Jiaying,ZHAO Renbao,LI Shuxuan,JIA Yu,FU Ning,QI Shuangyu. A new model to predict bubble point pressure: Its establishment and application in Tarim Oildom[J]. Petroleum Reservoir Evaluation and Development, 2022, 12(6): 927-934.

图/表 21

表1

常规经验公式"

常规经验公式	计算公式
STANDING	$p e x p = 24.46 R s γ g 0.83 × 10 1.638 × 10 - 3 T - 1.768 ? 6 γ o$
LASATER	$p e x p = 0.024 ? 2 T + 273 4.239 ? 5 y g 3.52 + 1 γ g ； y g = R s R s + 24 ? 056 γ o M o$ $γ o ≥ 0.834 ? 8 时， M o = 646.958 ? 8 - 1 ? 372.128 ? 7 1.076 γ o - 1$ $0.834 ? 8 ＞ γ o ＞ 0.788 ? 3 时， M o = 490.223 ? 7 - 857.627 ? 3 1.076 γ o - 1$ $γ o ＜ 0.788 ? 3 时， M o = 438.888 ? 9 - 730.555 ? 6 1.076 γ o - 1$
GLASO	$l o g p e x p = 1.744 ? 7 l o g p e x p * - 0.302 ? 18 l o g p e x p * 2 - 0.394 ? 6$ $p e x p * = 4.087 ? 6 R s γ g 0.816 1.821 ? 3 5.625 × 10 - 2 T + 1 0.173 124.628 ? 5 1.076 γ o - 1 0.989$
AL-MARHOUN	$p e x p = 0.470 ? 751 R s 0.715 ? 082 γ g - 1.877 ? 840 γ o 3.143 ? 700 (3.658 ? 5 × 10 - 3 T + 1) 1.326 ? 570$
DOKLA-QSMAN	$p e x p = 0.544 ? 021 R s 0.724 ? 047 γ g - 1.010 ? 49 γ o 0.107 ? 991 (3.658 ? 5 × 10 - 3 T + 1) 0.952 ? 584$

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经验公式	p_b（MPa）	R_s（m³/m³）	γ_g	γ_o	T（℃）	CO₂含量（%）	N₂含量（%）
STANDING	0.90~24.64	3.56~253.60	0.75~1.37	0.73~0.96	37.80~126.00
GLASO	1.03~48.26
LASATER	0.33~39.85	0.53~517.38	0.57~1.22	0.77~0.95	27.80~133.44
AL-MARHOUN	0.10~45.79	0~588.08	0.58~2.51	0.76~1.00	24.00~149.00
DOKLA-QSMAN	4.07~31.99	32.60~408.15	0.80~1.29	0.82~0.89	87.78~135.00	0.37 ~ 8.90	0~3.89
塔里木油区	1.90~74.30	3.00~713.00	0.61~1.50	0.78~1.02	83.60~164.40	0~13.70

序号	模型参数	对应影响因素
1	P₁	溶解气油比R_s（m³/m³）
2	P₂	溶解气相对密度γ_g
3	P₃	地层温度T（℃）
4	P₄	脱气原油相对密度γ_o
5	P₅	CO₂摩尔分数（%）
6	P₆	N₂和C₁摩尔分数（%）
7	P₇	C₂—C₆的摩尔分数（%）
8	P₈	C₇₊的摩尔分数（%）
9	P₉	临界压力p_cr（MPa）
10	P₁₀	临界温度T_cr（℃）

序号	模型参数	最优解	序号	模型参数	最优解
1	P₁	0.032 7	6	P₆	-0.448 1
2	P₂	0.786 8	7	P₇	-0.016 9
3	P₃	-0.254 2	8	P₈	0.194 5
4	P₄	0.950 8	9	P₉	0.017 2
5	P₅	4.072 3	10	P₁₀	0.870 6

序号	模型参数	最优解
1	P₁	-0.094 2
2	P₂	-0.515 3
3	P₃	2 497.081 9
4	P₄	-0.099 6
5	P₅	-0.009 6
6	P₆	0.927 9
7	P₇	0.095 9

序号	井号	泡点压力p_b（MPa）	气油比 R_s（m³/m³）	脱气原油相对密度γ_o	地层温度T（℃）	溶解气相对密度γ_g	CO₂摩尔分数（%）	N₂和C₁ 摩尔分数（%）	C₂—C₆的摩尔分数（%）	C₇₊的摩尔分数（%）	临界压力p_cr（MPa）	临界温度T_cr（℃）
1	YM322-H3	7.75	33.00	0.90	117.40	0.84	0.91	18.83	12.76	67.50	5.11	407.60
2	ST2-9	18.53	88.00	0.78	103.70	0.83	0.09	39.74	14.84	45.33	7.35	410.80
3	YM33	14.28	89.00	1.03	130.30	0.83	0.87	25.56	28.29	45.28	7.15	439.50
4	JY1-1	19.80	128.00	0.89	153.80	0.82	1.01	35.82	23.64	39.53	9.03	412.00
5	TZ62-2	37.32	154.00	0.64	132.30	0.84	2.00	58.57	4.15	35.28	17.54	431.00
6	QL1	30.68	156.00	0.77	113.40	0.84	0.11	50.68	17.32	31.89	12.90	452.80
7	LG11-1	50.02	172.00	0.61	118.00	0.86	1.35	65.93	2.56	30.16	15.86	482.00
8	YM17-1	50.09	207.00	0.65	105.80	0.85	0.09	63.62	8.89	27.40	23.58	469.70
9	ZG15-2	34.28	317.00	0.78	134.40	0.79	3.37	57.37	14.98	24.28	25.05	318.90
10	YM1	39.48	415.00	0.67	156.50	0.80	1.16	67.13	17.74	13.97	22.13	313.60