Method of integral throughput in multiple wells for extracting thick oil

An overall, heavy oil technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of low vapor pressure energy and thermal energy utilization, interwell interference, unfavorable huff and puff production life, etc., and achieve prolongation The effects of throughput life, prolonging life, and expanding the range of steam

Inactive Publication Date: 2005-03-30
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the middle and later stages of steam huff and puff, problems such as steam channeling, interference between wells, and low utilization rate of pressure energy and heat energy of inject...

Method used

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  • Method of integral throughput in multiple wells for extracting thick oil
  • Method of integral throughput in multiple wells for extracting thick oil
  • Method of integral throughput in multiple wells for extracting thick oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The buried depth of oilfield 1 is 300-600m, the effective thickness of oil layer is 35.0m, the ratio of net to total thickness is 0.6, the average porosity is 30%, the average permeability is 1000md, the coefficient of variation of permeability is 0.7, and the viscosity of crude oil under oil layer conditions is 10 ×10 4 cp, the original oil saturation is 70%. The oil field has been developed by single well steam stimulation, and the steam channeling is serious, the single well production drops rapidly, and the recovery degree is low.

[0034] 1) Carry out rough screening according to the geological characteristics and development status of the oilfield. The reservoir meets the following conditions: reservoir depth 0.40, total reservoir thickness > 5.0m, net-to-total thickness ratio > 0.4, reservoir porosity > 0.15, permeability variation coefficient < 0.8;

[0035] 2) Using the existing well pattern with a row spacing of 167m and a well spacing of 98m, according to ...

Embodiment 2

[0039] The buried depth of oil field 2 is 500-800m, the effective thickness of the oil layer is 30.0m, the net total thickness ratio is 0.5, the average porosity is 35%, the average permeability is 1500md, the coefficient of variation of permeability is 0.7, and the crude oil gravity under the oil layer conditions is 13API , the original oil saturation is 60%. The oil field has been developed by single well steam stimulation, and the steam channeling is serious, the single well production drops rapidly, and the recovery degree is low.

[0040] 1) Carry out rough screening according to the geological characteristics and development status of the oilfield. The reservoir meets the following conditions: reservoir depth 0.40, total reservoir thickness > 5.0m, net-to-total thickness ratio > 0.4, reservoir porosity > 0.15, permeability variation coefficient < 0.8;

[0041] 2) Using the existing well pattern with a well spacing of 70m, according to the capacity of steam injection eq...

Embodiment 3

[0045] The buried depth of the oil reservoir in Oilfield 3 is 830-1060m, the effective thickness of the oil layer is 41.0m, the net total thickness ratio is 0.5, the average porosity is 26%, the average permeability is 1062md, the permeability variation coefficient is 0.7, and the crude oil is degassed at 50°C The viscosity is 16.80×10 4 cp, the original oil saturation is 65%. The oil field has been developed by single well steam huff and puff, and the steam channeling is serious, with a steam channeling rate of more than 50%, and the single well production drops rapidly, and the recovery degree is only 10%.

[0046] 1) Carry out rough screening according to the geological characteristics and development status of the oilfield. The reservoir meets the following conditions: reservoir depth 0.40, total reservoir thickness > 5.0m, net-to-total thickness ratio > 0.4, reservoir porosity > 0.15, permeability variation coefficient < 0.8;

[0047] 2) Using the existing well pattern...

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Abstract

The invention is a method for multi-well cyclic steam stimulation thickened oil recovery by thermal recovery-steam injection technique, selecting: oil-layer depth in oil reservoir<1800m, residual oil saturation > 0.40, total oil-layer thickness > 5.0m, net-total thickness ratio >0.4, oil-layer porosity >0.15, and permeation rate variation coefficient <0.8; placing adjacent steam channeling wells and steam channeled wells (above two) together in the same group, simultaneously making steam injection in the well drainage sequence or block cluster well sequence, where steam injection strength of single well is 50-200 cu m/m and the well-bottom dryness fraction is greater than 50%, then stewing them, and finally opening them for production in the same sequence as above-mentioned. It can prevent steam channeling and interference between wells, effectively supplements pressure energy to oil layers and helps enlarge the steam spread range, and can increase the oil-layer pressure by about 2MPa as compared with single well steam stimulation method. It can both increase single-well output and prolong the life of steam stimulation.

Description

technical field [0001] The invention relates to oil exploitation, which is a method for exploiting heavy oil by using thermal recovery and steam injection technology to carry out multi-well overall huffing and puffing. Background technique [0002] Steam huff and puff is a production technology that periodically injects steam into oil wells to increase the production of heavy oil through heating to reduce viscosity and remove plugs. The production of heavy oil produced by steam huff and puff process accounts for about 80% of the total production of heavy oil thermal recovery in oil production. At present, the steam huff and puff production is carried out on a single well, and a large number of single well steam huff and puff practices show that there are many interwell interferences because the surrounding wells are not considered organically as a whole. There are two main reasons for its formation, one is due to the heterogeneity of the oil layer. For example, there are h...

Claims

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Application Information

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IPC IPC(8): E21B43/24
Inventor 张义堂刘喜林赵郭平孙守国于立君包连纯吴淑红张义祥
Owner PETROCHINA CO LTD
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