Development of Ultra-Low Permeability and Strong Water Sensitivity Reservoirs in Deep Strata of Shuang229-Wa111 Blocks

doi:10.7657/XJPG20200412

Abstract

Abstract:

Shuang229-Wa111 blocks are typical blocks with abundant incremental proved OOIP. Due to the low quality of the oil, there are some problems encountered in new production wells such as low productivity and rapid production decline and it is difficult to realize rapid producing of reserves and large-scale oil production in this block. In accordance with the development principle of overall deployment and implementation in batches, optimal reservoirs are selected to establish a test area. Aiming at the characteristics of deep burial, poor physical properties and high dip angle of the reservoir, this paper uses the control variable method and grouping analogy method to study reservoir stimulation and energy supplement by combining indoor feasibility study with field practices. The results show that compared with the effects of nonfracturing, conventional fracturing, conventional stratified fracturing and hydraulic fracturing with large volume of fracturing fluid, the effect of clustering network fracturing is pretty good, and large displacement fracturing with low sand concentration in vertical wells can be used to further improve oil production at the initial production stage. Near miscible gravity drainage technology with gas injected into reservoir top can improve recovery factor by 6% comparing with waterflooding, which can be used as a most effective energy supplement way in the study area. Efficient development of low quality reserves in the area can be realized by applying clustering network fracturing to improve oil production at the initial production stage and by using gas-injection near-miscible gravity drainage to effectively control the production decline.

Key words: Liaohe oilfield, ultra-low permeability reservoir, strong water sensitivity, clustering network fracturing, natural gas drive, gravity drainage, development method

CLC Number:

TE111

WANG Dongming. Development of Ultra-Low Permeability and Strong Water Sensitivity Reservoirs in Deep Strata of Shuang229-Wa111 Blocks[J]. Xinjiang Petroleum Geology, 2020, 41(4): 464-470.

Figures/Tables 7

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Fig. 1.

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Fig. 2.

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Fig. 3.

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组别	井名	生产层位	压裂跨度/m	有效厚度/m	压裂液总量/m³	砂量/m³	排量/（m³·min^-1）	砂液比/%	初期采油强度/[t·（d·m）^-1]
第一组	洼 1 井	$S_1^3$Ⅳ	43.2	10.4	488	50	5.0	26.2	0.8
	洼 2 井	$S_1^3$Ⅳ	35.9	18.0	540	45	7.0	21.6	0.9
	洼 3 井	$S_1^3$Ⅳ	14.6	8.5	439	22	8.0	12.9	1.6
第二组	洼 4 井	$S_1^3$Ⅲ	26.5	8.9	367	21	6.2	20.1	1.5
第二组	洼 5 井	$S_1^3$Ⅲ	24.3	15.5	458	31	6.5	21.2	1.3
第三组	洼 7 井	$S_1^3$Ⅳ	13.4	11.0	306	28	5.0	26.0	0.9
	洼8井	$S_1^3$Ⅳ	13.8	10.8	531	32	5.2	22.0	0.8
	洼9井	$S_1^3$Ⅳ	12.5	12.4	408	26	5.3	23.5	1.0
	洼 3井	$S_1^3$Ⅳ	14.6	8.5	439	22	8.0	12.9	1.6
第四组	洼 10井	$S_1^3$Ⅳ	50.0	17.9	448	52	5.6	23.0	1.3
第四组	洼 11井	$S_1^3$Ⅳ	48.6	25.4	410	49	6.1	19.8	1.1

样号	取心深度/m	层位	孔隙度/%	渗透率/mD	束缚水饱和度/%	共渗区/%	驱油效率/%	驱替压力/MPa
9	3 736.79	$S_1^3$Ⅲ	11.5	1.82	33.1	31.6	47.2	7.80
9-1	3 741.49	$S_1^3$Ⅲ	13.9	1.92	35.1	31.3	48.1	6.18

注入井	注入介质	日注入量/m3	注入压力/MPa	射孔厚度/m	有效厚度视吸气（水）指数/[m³·（d·MPa·m）^-1]
双38井	气	118	25.6	36.9	0.125
双24井	水	28	25.0	20.7	0.029

岩心编号	岩心长度/cm	孔隙体积/cm³	气测渗透率/mD	孔隙度/%	含油饱和度/%	地层倾角/（°）	注入速度/（cm³·min^-1）	驱油效率/%
1#	26.823	17.16	0.24	13.05	52.9	-15	0.07	69.2
2#	23.145	14.55	0.32	12.83	59.4	-7	0.07	68.7
3#	26.682	18.09	1.03	13.83	57.6	0	0.07	67.2