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Horizontal displacement type five-point horizontal well three-dimensional well pattern distributing method

A horizontal well, translational technology, applied in wellbore/well components, production fluids, earth-moving drilling, etc., can solve the problems of difficult-to-produce oil layers, low oil production rate, and no research on the development method of horizontal wells in reservoirs

Inactive Publication Date: 2016-06-15
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this development method is only suitable for a single set of thin oil layers of about 10m, and the oil production rate can reach 0.8% to 1%.
For thick oil layers or multi-layer superimposed reservoirs, it is difficult to fully develop oil layers by using single-layer horizontal wells, and the oil production rate is low, only 0.3% to 0.5%
Judging from the literature survey, there is currently no research on the development of horizontal wells in this type of reservoir.

Method used

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  • Horizontal displacement type five-point horizontal well three-dimensional well pattern distributing method
  • Horizontal displacement type five-point horizontal well three-dimensional well pattern distributing method
  • Horizontal displacement type five-point horizontal well three-dimensional well pattern distributing method

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Experimental program
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Effect test

Embodiment 1

[0033] This embodiment provides a figure 1 The three-dimensional well layout method of the translational five-point horizontal well pattern includes the following steps:

[0034] Step 1) Determine the oil layer conditions suitable for the deployment of the three-dimensional well pattern of the translational five-point horizontal well, and select this interval as the target implementation layer of the horizontal well;

[0035] Step 2) First implement the first water injection well, according to the direction of the maximum principal stress in the area as the well row direction, and implement the second water injection well at an interval of 500m, and then inject water from the first water injection well, along the vertical direction of the maximum principal stress The third water injection well is implemented at 1000m, and the fourth water injection well is implemented at an interval of 500m along the maximum principal stress direction from the third water injection well. The w...

Embodiment 2

[0044] On the basis of Example 1, this embodiment provides a three-dimensional well pattern layout method for translational five-point horizontal wells, wherein, in step 1), it is determined that the three-dimensional well pattern layout for translational five-point horizontal wells is suitable The process of oil layer 8 is as follows:

[0045] (1) Judging whether the oil layer 8 is multi-layer superimposed or thick oil layer;

[0046](2) In the case of multi-reservoir superimposition, the muddy interlayer 7 develops stably, and the thickness of the interlayer 7 is greater than or equal to 20m; in the case of thick oil layers without interlayers, the thickness of the oil layer 8 is greater than or equal to 40m.

[0047] The well spacing between the first horizontal well and the second horizontal well is 500m. According to reservoir engineering demonstration and numerical simulation research, combined with field practice, the development effect is the best when the horizontal ...

Embodiment 3

[0053] On the basis of Example 1, the new three-dimensional well pattern layout method of translational five-point horizontal wells of the present invention has achieved good development results in a certain block of Chang 6 multi-oil layer superimposed oil reservoir in Jiyuan, Ordos Basin.

[0054] The main sedimentary system type of a block in Chang 6 reservoir of Jiyuan Oilfield is lacustrine delta sedimentary system, and sedimentary microfacies include underwater distributary channels, interdistributary bays, mouth bars, underwater natural dikes, underwater crevasse fans, far sand bars, Sheet sand, etc. Chang 6 can be divided into six sublayers, and each sublayer develops 6-8 main distributary channels. During the deposition process, the sand body formed a large-scale composite reservoir type in the way of cutting and stacking and lateral accretion. The sand body presents the characteristics of sand-mud interbed, interbed or mud-in-sand, and is easy to form physical interl...

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Abstract

The invention provides a horizontal displacement type five-point horizontal well three-dimensional well pattern distributing method. The horizontal displacement type five-point horizontal well three-dimensional well pattern distributing method comprises the following steps of (1) determining a stratum suitable for the horizontal displacement type five-point horizontal well three-dimensional well pattern distributing, and selecting a target implementing layer of horizontal wells; (2) implementing a water injection well; (3) drilling a first horizontal well; (4) drilling a second horizontal well; (5) according to the thickness of a reservoir, increasing the number of horizontal wells along the horizontal direction; (6) cracking the horizontal wells; (7) injecting water by layers. The horizontal displacement type five-point horizontal well three-dimensional well pattern distributing method has the advantages that by arranging the horizontal displacement and cracking staggering of the upper and lower horizontal wells, the horizontal displacement type five-point horizontal well three-dimensional well pattern distributing type is formed; an oil layer can be sufficiently utilized, the effect of multiple horizontal layers sharing one set of water injection well pattern is realized, and the influence to the cracking effect by the interlayer communicating of gaps of the adjacent upper and lower horizontal wells in the oil testing process of oil drilling is avoided.

Description

technical field [0001] The invention belongs to the technical field of oil well development, and in particular relates to a three-dimensional well layout method for a translational five-point horizontal well pattern. Background technique [0002] Domestic low-permeability oil reservoirs account for about 1 / 4 of the total oil reserves, and newly added reserves account for more than 60% to 70% of the proven oil geological reserves of the year. The reserves are large, but it is difficult to effectively develop them. In the Ordos Basin, due to dense lithology, difficult fluid flow, and poor pressure transmission capacity, the formation energy is generally insufficient, and the natural production capacity of the oil well is low. If the oil well is developed only by natural energy, the formation pressure will drop rapidly after the oil well is put into production, and the production decline will be large. The recovery factor is very low, and after the pressure and production decre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/30E21B43/17E21B43/26E21B43/20
CPCE21B43/305E21B43/17E21B43/20E21B43/26
Inventor 赵继勇张瀚丹谢启超丁黎孙栋樊建明刘建王博刘强
Owner PETROCHINA CO LTD
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