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Method for increasing yield of middle and high permeability oil reservoirs

A high-permeability, oil-reservoir technology, applied in the direction of chemical instruments and methods, earthwork drilling, drilling compositions, etc., can solve problems affecting the degree of recovery of test blocks, waste of polymers and biosurfactants, etc. , to achieve the effect of improving field test effect, improving water flooding efficiency, pertinence and operability

Active Publication Date: 2016-07-20
YANTAI ZHIBEN INTPROP OPERATIONS MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method injects polymer and surfactant in the test block by injecting all water wells at the same time, and different water wells correspond to oil layers with different permeability. On the one hand, it will cause waste of polymer and biosurfactant, on the other hand, it will greatly affect the overall recovery degree of the test block

Method used

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  • Method for increasing yield of middle and high permeability oil reservoirs
  • Method for increasing yield of middle and high permeability oil reservoirs
  • Method for increasing yield of middle and high permeability oil reservoirs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In block D of an oilfield, the reservoir temperature is 68°C, the reservoir pressure is 11.3MPa, the porosity is 38.9%, and the pore volume is 7.2×10 4 m 3 , permeability 2700×10 -3 μm 2 , geological reserves 3.5×10 4 t, the viscosity of ground crude oil is 1150mPa.s, the salinity of formation water is 15680mg / L, the average water content of the block before the test is 96.3%, there are 12 oil wells and 6 water wells, and the water injection pressure and daily water injection volume of the wells are shown in Table 1. Utilize method of the present invention to implement field oil displacement test in block D, concrete implementation steps are as follows:

[0030] Table 1 Water injection pressure and daily water injection volume of well D in block 1

[0031]

[0032] (1) Reservoir screening

[0033] The screening criteria for reservoirs are that the reservoir temperature is less than 80°C and the reservoir permeability is greater than 1500×10 -3 μm 2 1. The visc...

Embodiment 2

[0045] In block E of an oilfield, the reservoir temperature is 73°C, the reservoir pressure is 13.5MPa, the porosity is 39.2%, and the pore volume is 9.0×10 4 m 3 , permeability 3200×10 -3 μm 2 , geological reserves 4.5×10 4 t, the viscosity of surface crude oil is 1020mPa.s, the salinity of formation water is 8650mg / L, the average water content of the block before the test is 98.3%, there are 8 oil wells and 5 water wells, and the daily water injection volume and water injection pressure of the water wells are shown in Table 2. Utilize method of the present invention to implement field oil displacement test in block B, concrete implementation steps are as follows:

[0046] Table 2 Water injection pressure and daily water injection volume of wells in Block E

[0047]

[0048] (1) Reservoir screening

[0049] The screening criteria for reservoirs are that the reservoir temperature is less than 80°C and the reservoir permeability is greater than 1000×10 -3 μm 2 1. The ...

Embodiment 3

[0061] In an oilfield block G, the reservoir temperature is 55°C, the reservoir pressure is 13.2MPa, the porosity is 37.2%, and the pore volume is 6.5×10 4 m 3 , permeability 2600×10 -3 μm 2 , geological reserves 3.8×10 4 t, the viscosity of surface crude oil is 850mPa.s, the salinity of formation water is 7560mg / L, the average water content of the block before the test is 96.3%, there are 15 oil wells and 7 water wells, and the daily water injection volume and water injection pressure of the water wells are shown in Table 3. Utilize method of the present invention to implement field oil displacement test in block G, concrete implementation steps are as follows:

[0062] Table 3 Daily water volume and water injection pressure of wells in Block G

[0063]

[0064] (1) Reservoir screening

[0065] The screening criteria for reservoirs are that the reservoir temperature is less than 80°C and the reservoir permeability is greater than 1000×10 -3 μm 2 1. The viscosity of ...

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Abstract

The invention belongs to the technical field of tertiary oil recovery, and particularly relates to a method for increasing the yield of middle and high permeability oil reservoirs. The method specifically comprises the following steps of screening of the oil reservoirs, determination of polymer injection wells and surfactant injection wells of the target oil reservoirs, the injection stage of polymer, the injection stage of a surfactant, the water normal injection stage and the field test effect evaluation stage. The method has the characteristics of being low in investment cost and high in field test recovery rate increase degree, the field test recovery rate is increased by 15% or more, and the input-output ratio is greater than 1:5. The method has the characteristics of being simple in process and high in pertinence and operability. Accordingly, the method can be widely applied to field tests for increasing the yield of the middle and high permeability oil reservoirs.

Description

technical field [0001] The invention belongs to the technical field of tertiary oil recovery, and in particular relates to a method for increasing production of medium and high permeability oil reservoirs. Background technique [0002] With the rapid development of my country's economy, the demand for oil is increasing day by day, and the shortage of oil is becoming more and more serious. At present, the recovery of crude oil in my country is less than 40%, and the remaining recoverable oil reserves are huge, especially in medium and high permeability oil reservoirs. According to statistics, medium and high permeability reservoir resources account for more than 60% of the total resources. After long-term water flooding development, medium and high permeability reservoirs have reached the middle and late stages of the high water cut period, and the production decline is serious, and it is difficult to stabilize production. Therefore, new improvements are urgently needed. Techno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22E21B43/16C09K8/594C09K8/58
CPCC09K8/58C09K8/594E21B43/16E21B43/164
Inventor 刘琴
Owner YANTAI ZHIBEN INTPROP OPERATIONS MANAGEMENT CO LTD
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