Microbial single well huff and puff oil exploiting method of low-yield inefficient oil well

A technology for microorganisms and oil wells, applied in the field of microbial oil recovery, can solve the problems of influence, inability to effectively improve the output of low-yield and low-efficiency oil wells, etc., and achieve the effects of simple process, improved activation effect and field test effect, and strong operability.

Active Publication Date: 2017-09-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcoming of this method is: using any one or more of the three microorganisms in the test oil wells to produce biosurfactants, biogas and bi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Example 1:

[0031] Test well C in a block of Shengli Oilfield Hekou Oil Production Plant 2 General situation: reservoir temperature 75℃, crude oil viscosity 1256mPa.s, water cut 98.5%, liquid production rate 8.0m 3 / d. The bottom hole pressure is 3.2MPa, the oil layer thickness is 4.0m, and the daily oil production of the oil well before the test is 0.12t; the endogenous microorganism analysis result is that the concentration of lactic acid bacteria is 1.1×10 3 Pcs / mL, the bacterial concentration of Erwinia tahitiana is 2.0×10 3 Pcs / mL, the concentration of Bacillus subtilis is 1.0×10 3 Pieces / mL. Specific steps for implementing the invention in this well:

[0032] (1) Screening of test oil wells

[0033] Test well C 2 The reservoir temperature is 75℃, the crude oil viscosity is 1256mPa.s, the water cut is 98.5%, and the liquid production is 8.0m 3 / d, the bottom hole pressure is 3.2MPa; the endogenous microorganism analysis result is that the concentration of lactic acid bac...

Example Embodiment

[0043] Example 2:

[0044] Test well C in a block of Shengli Oilfield Hekou Oil Production Plant 5 General situation: oil reservoir temperature 70℃, crude oil viscosity 1023mPa.s, water cut 99.2%, liquid production volume 9.2m 3 / d. The bottom hole pressure is 2.5MPa, the oil layer thickness is 6.2m, and the daily oil production of the oil well before the test is 0.07t; the endogenous microorganism analysis result is that the formic acid bacteria concentration is 2.0×10 3 Pcs / mL, the concentration of Xanthomonas black rot in cabbage is 5.0×10 2 Pcs / mL, Pseudomonas bacteria concentration is 1.1×10 3 Pieces / mL. Specific steps for implementing the invention in this well:

[0045] (1) Screening of test oil wells

[0046] Test well C 5 The reservoir temperature is 70℃, the crude oil viscosity is 1023mPa.s, the water content is 99.2%, and the liquid production is 9.2m 3 / d, bottom hole pressure 2.5MPa; the endogenous microorganism analysis result is that the concentration of formic acid ba...

Example Embodiment

[0056] Example 3:

[0057] Test well C in a block of Shengli Oilfield Hekou Oil Production Plant 12 General situation: oil reservoir temperature 67℃, crude oil viscosity 1828mPa.s, water cut 98.2%, liquid production volume 7.2m 3 / d. The bottom hole pressure is 4.3MPa, the oil layer thickness is 5.0m, and the daily oil production of the oil well before the test is 0.13t; the endogenous microbial analysis result is that the concentration of acetogenic bacteria is 5.0×10 3 Pcs / mL, the concentration of Sclerotium dextran is 2.0×10 2 Pcs / mL, Bacillus concentration is 2.0×10 3 Pieces / mL. Specific steps for implementing the invention in this well:

[0058] (1) Screening of test oil wells

[0059] Test well C 12 The reservoir temperature is 67℃, the crude oil viscosity is 1828mPa.s, the water content is 98.2%, and the liquid production volume is 7.2m. 3 / d, bottom hole pressure 4.3MPa; the endogenous microorganism analysis result is that the concentration of acetogenic bacteria is 5.0×10 3 ...

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Abstract

The invention belongs to the technical field of microbial oil exploiting, and particularly relates to a microbial single well huff and puff oil exploiting method of a low-yield inefficient oil well. The microbial single well huff and puff oil exploiting method of low-yield inefficient oil well comprises the following steps of screening of a trial oil well; acidizing and block removing of the trial oil well, and deeply blocking adjusting of the trial oil well; improving of oil washing efficiency of the trial oil well; and evaluating of the field trial effect. The microbial single well huff and puff oil exploiting method of low-yield inefficient oil well has the characteristics of being simple in technology, high in pertinence and operability, and excellent in field trial effect, the term of validity is more than 30 months, average daily incremental oil of the single well is larger than 3.5 t, and the input-output ratio is larger than 1:5. Therefore, the microbial single well huff and puff oil exploiting method of the low-yield inefficient oil well can be extensively applied to the field trial of improving the oil well yield of the low-yield inefficient oil well.

Description

technical field [0001] The invention relates to a microbial oil recovery method, in particular to a microbial single well huff and puff oil recovery method for low-yield and low-efficiency oil wells. Background technique [0002] At present, most oil fields have entered the late stage of development. With the continuous extraction of underground crude oil, the liquid supply capacity of the formation is reduced, and the production pressure difference is reduced. There are common problems of rapid decline in oil well productivity, reduced pump efficiency, and even dry pumping. Oil wells are collectively referred to as low-yield and low-efficiency wells. The above-mentioned problems are mainly caused by the following three aspects: (1) Crude oil contains wax, colloid, asphaltenes, etc. It is deposited together with other impurities and accumulates around the well wall and the perforated layer, increasing fluid flow resistance and even blocking the pores; (2) Various workover me...

Claims

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Application Information

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IPC IPC(8): E21B43/22C09K8/582
CPCC09K8/582E21B43/16
Inventor 汪卫东孙刚正高光军吴晓玲巴燕汪刚跃赵凤敏刘涛冯云谭晓明
Owner CHINA PETROLEUM & CHEM CORP
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