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The deep sedimentation profile control method of water injection well in oilfield

A technology for water injection and profile control in oilfields, which is used in wellbore/well components, earthwork drilling, and fluid production. , reducing the effect of scaling problems

Active Publication Date: 2017-06-13
DAGANG OIL FIELD GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The problem to be solved by the present invention is to overcome the problem of uneven solution mixing and poor profile control effect in the prior art, make full use of the divalent ions in the formation water, inject green scale inhibitor into the profile control fluid to delay the formation of sedimentation and scaling, Improved profile control while reducing costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The formation water in Xiaoji area of ​​Dagang Oilfield is used, and the salinity in the water is 2.7×10 4 mg / L; According to the SY / T5523-2006 oilfield water analysis method, analyze the sum of divalent cations such as calcium, magnesium, barium, strontium and iron in the effluent (molar concentration) M C =0.17mmol / L; analyze the total content of divalent anions such as sulfate and sulfite in the formation water M n = 4.13 mmol / L. If the anion content is greater than the cation content, calcium chloride is used to precipitate anions in the formation water. The required calcium ion concentration is 4.13-0.17=3.96mmol / L, that is, calcium chloride needs to be added to the formation water so that the concentration of calcium chloride is 3.96mmol / L.

[0026] At an on-site temperature of 105°C, a solution with a concentration of calcium chloride of 3.96mmol / L was prepared with formation water in the Xiaoji area of ​​Dagang Oilfield, and different amounts of scale inhibito...

Embodiment 2

[0030] Using the formation water in Zaoyuan area of ​​Dagang Oilfield, according to the SY / T 5523-2006 oilfield water analysis method, the total content (molar concentration) M of divalent cations such as calcium, magnesium, barium, strontium and iron in the formation water was analyzed C =2.67mmol / L; analyze the total content of divalent anions such as sulfate and sulfite in the formation water M n = 0.26 mmol / L. If the anion content is less than the cation content, ammonium sulfate is used to precipitate cations in the formation water. The required sulfate concentration is 2.67-0.26=2.41mmol / L, that is, ammonium sulfate needs to be added to the formation water to make the concentration of ammonium sulfate 2.41mmol / L.

[0031] At an on-site temperature of 85°C, a solution with an ammonium sulfate concentration of 2.41mmol / L was prepared with formation water from the Zaoyuan area of ​​Dagang Oilfield, and different amounts of scale inhibitors were added to the solutions to p...

Embodiment 3

[0035] Using the formation water in the Wangguantun area of ​​Dagang Oilfield, according to the SY / T 5523-2006 oilfield water analysis method, the sum of the contents of divalent cations such as calcium, magnesium, barium, strontium and iron in the formation water (molar concentration) M C =3.28mmol / L; the sum of the content of divalent anions such as sulfate and sulfite in the formation water was analyzed M n = 0.17 mmol / L. If the anion content is less than the cation content, sodium silicate is used to precipitate cations in the formation water. The required silicate concentration is 3.28-0.17=3.11mmol / L, that is, sodium silicate needs to be added to the formation water to make the concentration of sodium silicate It is 3.11mmol / L.

[0036] At an on-site temperature of 80°C, a solution with a sodium silicate concentration of 3.11mmol / L was prepared with formation water from the Wangguantun area of ​​Dagang Oilfield, and different amounts of scale inhibitors were added to th...

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PUM

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Abstract

The invention provides an oil field water injection well deep sediment profile control method. The oil field water injection well deep sediment profile control method comprises the following steps that (1) the molar concentration sum Mc of bivalent positive ions of formation water and the molar concentration sum Mn of bivalent negative ions of the formation water are analyzed; (2) if the bivalent positive ions are more, ammonium sulfate or sodium silicate is added in the formation water, wherein the concentration of the ammonium sulfate or sodium silicate is made to be Mc-Mn; (3) if the negative irons are more, calcium chloride is added in the formation water, the adding amount of the calcium chloride is determined, and the concentration of the calcium chloride is made to be Mn-Mc; (4) the needed adding amount of a scale inhibitor is determined, and the time for generating sediment and scaling is made to be within 1-7 days; (5) inorganic salt and the scale inhibitor are added in the field formation water according to the adding amount determined in the steps, and the mixture is evenly mixed; (6) the profile control liquid determined in the step (5) is injected in a formation or a simulation rock core. By means of the oil field water injection well deep sediment profile control method, the problems that in the prior art, solution mixing is not even, and the profile control effect is not good are solved, the bivalent ions in the formation water are fully used, the environment-friendly scale inhibitor is injected in the profile control liquid to delay the formation of sediment and scale, cost is reduced, and meanwhile the profile control effect is improved.

Description

technical field [0001] The invention relates to a technology for profile control of water injection wells in the process of oil field development, in particular to a method for deep sedimentation profile control of water injection wells in oil fields. Background technique [0002] A well that directly produces oil in an oil field is called an oil well. The wells used to inject water into the formation to increase or stabilize the production of oil wells are called water injection wells, and most of the injected water is formation water produced from oil wells. Due to various reasons, during the water flooding development process, the water injected from the wells quickly channeled to the oil well along the channeling channel (large pore high permeability zone), resulting in low oil displacement efficiency, less oil production and more water production in the oil well. [0003] Usually gel, inorganic precipitation, or granular agents are used to inject into water wells to bl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22
CPCE21B33/13E21B43/16
Inventor 葛红江雷齐玲程静杨卫华雷齐松杨敏
Owner DAGANG OIL FIELD GRP