常压页岩气水平井低成本高密度缝网压裂技术研究

Abstract

Abstract:

With the increasing demand for energy, shale gas, as a new type of unconventional natural gas resource, has attracted more and more attention. At present, the commercial development of high pressure shale gas reservoir in China has been successfully realized, but the efficient development technology of shale in deep layer and normal pressure shale is still in the exploratory stage. The normal pressure shale reservoirs in China are mainly located in the residual syncline outside the basin. The deformation degree of structure is strong, the formation pressure coefficient is between 0.9 and 1.3, the buried depth is generally shallow, the formation energy is insufficient, and the daily production of single well after fracturing is （1~5）×10 ⁴m ³. All those problems result in the failure of commercial breakthrough so far. The fracturing technologies of high-pressure shale gas reservoirs have little effect in the process of normal-pressure shale reconstruction. Based on the difficult problems in the transformation of atmospheric shale gas wells, optimization has been carried out on many aspects such as the perforation mode, artificial fracture control and support technology, field construction technology and fracturing materials. The suitable network fracturing with high density is researched, and the multi-cluster fracture equilibrium extension and multi-scale artificial fracture network are preliminarily realized. The scheme has been tested in an normal pressure shale gas well of a certain shale gas block in southeast Chongqing, and good reconstruction effect has been obtained after fracturing.

Key words: normal pressure shale gas, horizontal well, high density, low cost, network fracturing

CLC Number:

TE357

JIANG Tingxue,SU Yuan,BIAN Xiaobing,MEI Zongqing. Network fracturing technology with low cost and high density for normal pressure shale gas[J].Reservoir Evaluation and Development, 2019, 9(5): 78-83.

Figures/Tables 12

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References 15

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黏度/（mPa·s）	排量/ （m³·min^-1）	主缝最大缝宽/mm	主缝平均缝宽/mm	次级缝最大缝宽/mm	次级缝平均缝宽/mm
3	10	4.20	2.21	0.57	0.28
3	12	4.60	2.42	0.66	0.32
3	14	4.64	2.44	0.68	0.33
3	16	4.52	2.38	0.74	0.36
3	18	4.50	2.37	0.78	0.38
10	10	4.31	2.27	0.78	0.38
10	12	4.37	2.30	0.80	0.39
10	14	4.39	2.31	0.82	0.40
10	16	4.37	2.30	0.84	0.41
10	18	4.28	2.25	0.86	0.42

簇	主缝				分支缝
簇	缝长/m	最大缝宽/mm	平均缝宽/mm	裂缝体积/m³	缝长/m	最大缝宽/mm	平均缝宽/mm	裂缝体积/m³
第1簇	520	4.1	2.3	45	2 222	0.7	0.4	21
第2簇	480	4.2	2.3	48	1 797	0.8	0.5	20
第3簇	520	4.1	2.2	44	2 190	0.7	0.4	20
合计				137				61

体系配方	表观黏度/（mPa·s）	降阻率/%	表面张力/（mN·m^-1）	防膨率/%
0.01 %降阻剂+0.1 %助排剂+0.3 %防膨剂	2.3	70.0	22.8	75.0
0.03 %降阻剂+0.1 %助排剂+0.3 %防膨剂	6.6	69.3	22.6	78.0
0.07 %降阻剂+0.1 %助排剂+0.3 %防膨剂	11.5	67.2	24.3	79.0
0.10 %降阻剂+0.1 %助排剂+0.3 %防膨剂	14.5	66.5	25.3	78.0

井名	压裂段长/m	压裂段数	单段簇数	总液量/m³	总砂量/m³	排量/（m³·min^-1）	平均日产量/10⁴m³
A	1 920	20	4~6	45 719	2 576	12~18	10
B	1 280	20	3~5	46 542	2 108	12~18	3.7
C	1 400	19	2~5	21 388	814	12~16	3.3

井名	井深/ m	水平段长/ m	总砂量/ m³	总液量/ m³	压裂段数/ 段	压裂主车/ 台	6000电动泵/ 台	压裂总费用/万元	平均单段费用/ 万元
D（17段）	4 378	1 317	2 008.2	34 139.0	17	18	0	3 216.00	189.18
A（20段）	4 573	1 800	2 576.0	45 719.3	20	6	8	2 551.00	127.55
A与D差值	195	483	567.8	11 580.3	3	-12	8	-665.00	-61.63

Network fracturing technology with low cost and high density for normal pressure shale gas

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