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An infill adjustment method suitable for horizontal wells in low-permeability oilfields

A technology of horizontal well area and adjustment method, which is applied in the fields of earthwork drilling, wellbore/well components, data processing application, etc., and can solve the problems that the infill adjustment method is not applicable to the horizontal well area, etc.

Active Publication Date: 2022-03-08
DAQING OILFIELD CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention provides an infill adjustment method suitable for horizontal well areas in low-permeability oilfields, which solves the problem that existing conventional infill adjustment methods are not applicable to horizontal well areas

Method used

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  • An infill adjustment method suitable for horizontal wells in low-permeability oilfields
  • An infill adjustment method suitable for horizontal wells in low-permeability oilfields
  • An infill adjustment method suitable for horizontal wells in low-permeability oilfields

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Embodiment

[0066] Take the encryption adjustment of Block 603 in Zhaozhou Oilfield as an example:

[0067] Since September 2003, block 603 of Zhouzhou has been developed with a combined vertical well-horizontal well pattern, and the oil-bearing area is 31.30km 2 , geological reserves 714.74×10 4 t. As of December 2016, a total of 206 oil and water wells have been put into production, including 118 oil wells, including 27 horizontal wells and 88 water wells. The wells in this area are all basic well pattern wells without infill. This area is encrypted.

[0068] Step 1: According to the actual production situation of Block 603 in Zhouzhou, apply theoretical formulas and oil field values ​​to calculate the block economic limit well spacing and the lower limit of economic limit effective thickness. The values ​​of the parameters in the formula are as follows (Table 1, the values ​​of the parameters are based on the actual values ​​in the oil field, which are known values):

[0069] Table...

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Abstract

The invention discloses an infill adjustment method suitable for horizontal well areas in low-permeability oilfields, which is characterized in that it includes calculating the economic limit well spacing and the lower limit of the economic limit effective thickness of the well areas requiring infill adjustment; The well map is compared with the four horizontal well area infill adjustment templates, and the corresponding horizontal well area infill adjustment template is selected; the infill well position is deployed according to the corresponding horizontal well area infill adjustment template; the well position is measured on the well map. The well spacing between the proposed infill well and the adjacent well at the above-mentioned infill well position; according to the layered sand body map of the well zone that needs to be intensified and adjusted, the thickness of the proposed infill well at the above-mentioned infill well position is predicted by the thickness of the sand body encountered by the surrounding oil and water wells ; If the well spacing is greater than the economic limit well spacing, and the thickness is greater than the effective thickness of the economic limit, then the proposed infill well is an infill well, otherwise it is a non-infill well; Applies to problems in horizontal well areas.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to an infill adjustment method suitable for horizontal wells in low-permeability oilfields. Background technique [0002] The development of horizontal wells has effectively promoted the effective production of low-permeability reservoirs. A certain block is a typical vertical-flat joint development well pattern. The comprehensive water cut of the block is 67.3%. In the water flooding blank area, the remaining oil is relatively enriched locally, and the overall recovery degree of the block is low, only 12.88%. [0003] At present, in response to such a situation, the method of infill adjustment is usually adopted. The conventional infill method in the vertical well area is not suitable for the well pattern in the horizontal well area. , the reserves at the near end of the horizontal well cannot be fully and effectively produced; secondly, due to the perforation encount...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/30G06Q30/02G06Q50/02
CPCE21B43/305G06Q30/0206G06Q50/02
Inventor 刘性全冷小勇孙美凤祖琳郑宪宝吴景峰宫宝刘仰东马玉玲王利郭晓娟
Owner DAQING OILFIELD CO LTD