深层煤岩气水平井压裂关键技术——以准噶尔盆地白家海地区侏罗系为例

doi:10.13809/j.cnki.cn32-1825/te.2024.04.013

Abstract

Abstract:

The Jurassic coal seam in the Baijiahai area of the Junggar Basin is characterized by a low elastic modulus, high Poisson's ratio, and low hardness, presenting challenges in vertical well hydraulic fracturing such as difficulty in sanding and low gas production. To address these issues, a technical approach of “verification + exploration” was implemented. This involved on-site verification of cluster interference and exploration of the effects of different fracturing fluids on increasing production. Key findings from this approach include: ① Field Tests on Vertical Wells: It was observed that targeting coal seams as the preferred layer for horizontal well drilling could yield better development outcomes. ② Optimization of Fracturing Parameters: Important parameters that affect sanding difficulties and stimulation volume include cluster spacing, displacement, viscosity, proppant particle size, and sanding scale. A fracturing technology combining large displacement, high viscosity, and extensive sanding is recommended. ③ Field Application of Fracturing Fluids: The use of gel fracturing fluids for long fractures and the subdivision cutting volume transformation in horizontal wells have proven to be effective techniques. These processes have significantly enhanced the production benefits of deep Jurassic coal-rock gas in the Baijiahai area, achieving remarkable results. The success of this study provides a technical breakthrough and support for the exploration and development of deep coal-rock gas, holding significant implications for the development of coal-rock gas resources in the Junggar Basin.

Key words: Junggar Basin, Baijiahai area, deep coal-rock gas, hydraulic fracturing, horizontal well

CLC Number:

TE37

Xuebin LI,Lixin JIN,Chaofeng CHEN, et al. Key technologies of horizontal well fracturing for deep coal-rock gas: A case study of Jurassic in Baijiahai area, Junggar Basin[J]. Petroleum Reservoir Evaluation and Development, 2024, 14(4): 629-637.

Figures/Tables 12

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References 31

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井名	井段/ m	射孔位置	压裂液类型	施工排量/ （m³/min）	压裂液量/m³	加砂量/ m³	施工压力/ MPa	停泵压力/ MPa	日产气/ m³
C3154井	2 422~2 434	夹矸层	胍胶	3~4	551.7	40.0	36~50	22.0	0
C3163井	2 431~2 435	下煤岩层	胍胶	3~4	387.2	23.2	20~58	41.2	800

井号	井段/m	煤层厚度/m	压裂工艺	压裂液类型	压裂液量/m³	设计加砂量/m³	现场加砂量/m³	施工排量/ m³/min	日产气/ m³	试产时间/d	压裂时间	备注
彩504井	2 567~2 583	16	油管压裂	胍胶液	171.4	30	14.5	3.5	7 200~2 100	120	2005年	施工压力爬升，未完成加砂
彩512井	2 614~2 619	5	套管压裂	活性水+ 清洁压裂液	551.0	35	35.0	8.0~10.0	1 540~0	18	2013年	产气10 d后停喷
彩514井	2 516~2 521	5	油管压裂	胍胶液	440.0	40	40.0	4.0~5.5	2 300~2 080	78	2018年	施工压力爬升，完成加砂
C3163井	2 431~2 435	4	油管压裂	胍胶液	387.2	40	23.2	2.0~4.0	800	17	2020年	施工压力爬升，未完成加砂

Key technologies of horizontal well fracturing for deep coal-rock gas: A case study of Jurassic in Baijiahai area, Junggar Basin

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