Method for treating oil field measure shaft backflow liquid to prepare rilling fluid

A technology of flowback liquid and measure well, which is applied in the direction of filtration treatment, sedimentation treatment, water/sewage treatment, etc., and can solve the problem that acid flowback liquid and high-viscosity flowback liquid cannot be treated simultaneously, achieving remarkable iron removal effect, The effect of reducing production cost and reducing dosage

Active Publication Date: 2016-09-28
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the problem that acidic flowback fluid and high viscosity flowback fluid cannot be treated simultaneously in the existing treatment methods, the present invention provides a method for dosing drilling fluid after treatment of wellbore flowback fluid for oil field measures, so as to realize acidic flowback The synchronous treatment of liquid and high-viscosity flowback l...

Method used

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  • Method for treating oil field measure shaft backflow liquid to prepare rilling fluid
  • Method for treating oil field measure shaft backflow liquid to prepare rilling fluid
  • Method for treating oil field measure shaft backflow liquid to prepare rilling fluid

Examples

Experimental program
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Effect test

Embodiment 1

[0051] In order to overcome the problem that the acidic flowback liquid and the high viscosity flowback liquid cannot be simultaneously processed in the existing treatment method, the present invention provides such as figure 1 Shown is a method of oil field measure wellbore flowback fluid treatment for drilling fluid mixing, to realize the synchronous treatment of acidic flowback fluid and high viscosity flowback fluid, so that the viscosity, pH, ore of the flowback fluid after treatment Chemical degree, CL - , SO 4 2- , Ca 2+ +Mg 2+ And the foaming agent content meets the requirements of drilling fluid mixing. The micro-electrolysis technology integrates redox, flocculation adsorption, complexation and electro-precipitation, and is suitable for the viscosity reduction and purification treatment of wellbore flowback fluid in oilfields. According to the principle of the original battery, the acidic electrolyte environment can enhance the electric field effect, accelerate t...

Embodiment 2

[0073] Based on Example 1, in this example, in the step 4), the blending ratio is determined by measuring the pH value of the acidic flowback liquid and the high viscosity flowback liquid, and blended into a partial pH value of 3-5. Acid liquid; specific steps are:

[0074] The first step is to measure the pH of the high-viscosity flowback liquid and the acidic flowback liquid; take 100 mL of each flowback liquid sample, and use a pH tester to measure the pH value of the sample; record the pH value of the high-viscosity flowback liquid sample = a, and The pH value of the drainage sample = b; calculate the pH ratio of the two flowback fluids = a:b;

[0075] The second step is to carry out the pretreatment of the mixed sample of high-viscosity flowback liquid and acidic flowback liquid; measure the samples of AmL high-viscosity flowback liquid and BmL acidic flowback liquid according to the pH ratio, mix and stir evenly and let stand for 10 minutes. Requirements A:B =a:b;

[0...

Embodiment 3

[0103] Based on the above embodiments, this embodiment takes the implementation process of proportional blending of flowback fluid in Changqing Oilfield CQML-18 wellbore acidizing operation and CQCH-05 wellbore secondary fracturing operation as an example. The water quality characteristics of the two flowback liquids before treatment are shown in the table below.

[0104]

[0105] CQML-18 wellbore acidizing operation flowback fluid and CQCH-05 wellbore secondary fracturing operation flowback fluid proportional blending and synchronous water quality characteristics are shown in the following table, the results show that the present invention can meet the oilfield measures wellbore flowback fluid treatment Afterwards, it is used for the reuse purpose of drilling fluid dosing.

[0106]

[0107] Taking Changqing Oilfield CQJY-27 wellbore acidizing operation flowback fluid and CQAS-15 wellbore pre-acid fracturing operation flowback fluid proportional blending implementation p...

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Abstract

The invention provides a method for treating oil field measure shaft backflow liquid to prepare rilling fluid. The method comprises the following steps of coarse pipeline filtration, gravitational sand setting, advectional oil separation, proportional mixing, micro-electrolytic oxidation, two-stage neutralization, coagulating filtration and water quality testing. The method achieves synchronous treatment of acidic backflow liquid and high-viscosity backflow liquid and is suitable for purification treatment of the backflow liquid produced in the operating measure process including old well fracturing, acidification, well washing and workover, and the viscosity, pH, mineralization degree, CL<->, SO4<2->, Ca<2+>+Mg<2+> and foaming agent content of treated water meet the requirements for drilling fluid preparation. An acidic electrolyte environment can enhance an electric field effect, accelerate the electric flocculation and oxidation reduction reaction, destroy a stable system of dispersoid in electrolyte, quickly make dispersoid ions precipitate or gather towards an electrode and accordingly improve the suspended-state or dispersoid-state pollutant removal efficiency in a solution.

Description

technical field [0001] The present invention relates to the technical field of surface engineering for old oilfield reconstruction, and in particular to a method for dosing drilling fluid after oilfield measure wellbore flowback fluid treatment, which is suitable for old well fracturing, acidification, well washing and workover operations. The generated flowback fluid is purified and treated, and the water quality after treatment meets the requirements of drilling fluid dosing at the oilfield production site. Background technique [0002] With the continuous development of the oilfield, the water cut of the oil layer rises, the pressure drops, and the difficulty of production increases. In order to ensure the productivity of the oil well, repeated measures such as well washing, workover, acidizing, and fracturing are often taken in old oilfield reservoirs. During the operation, the wellbore The flowback liquid contains a large amount of fine sand, suspended solids, organic m...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F103/10
CPCC02F1/001C02F1/40C02F1/461C02F1/5236C02F1/5245C02F1/56C02F1/66C02F9/00C02F2001/007C02F2103/10C02F2209/003
Inventor 刘沛华周立辉穆谦益李岩冀忠伦张璇杨琴朱妍任鹏刘宁
Owner PETROCHINA CO LTD
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