CN1351967A

CN1351967A - High pressure injected water electrolyzing and sterilizing device for oil field

Info

Publication number: CN1351967A
Application number: CN01138284A
Authority: CN
Inventors: 强敏; 俞江山; 程运富; 易德莲; 周华; 胡家华; 陈贤成; 江晓冰
Original assignee: Jianli Jingchu Electronic Chemical Technology Development Co Ltd; Wuhan University of Science and Engineering WUSE
Current assignee: Jianli Jingchu Electronic Chemical Technology Development Co Ltd; Wuhan University of Science and Engineering WUSE; Wuhan University of Science and Technology WHUST
Priority date: 2001-12-14
Filing date: 2001-12-14
Publication date: 2002-06-05

Abstract

A water electrolyzing and sterilizing device includes one casing, one water inlet and one water outlet, and positive and negative electrodes inside the casing. It features that there are inside the casing fixed electrodes and support board for water flow to pass through and the support board has interphase distributed water flow holes, and electrode fixing holes for positive electrodes and negative electrodes to penetrate and set up along water flow direction with the electrodes in the same polarity are connected serially. The said device can kill sulfur-reducing bacteria and saprophytic bacteria in water to avoid apparatus corrosion and stratum blocking caused by high-pressure injected water.

Description

High-pressure water injection electrolysis sterilization equipment for oil field

Field of the invention

The invention relates to an electrolytic sterilization device for high-pressure water injection in an oil field, which is used for carrying out electrolytic sterilization on oil field sewage.

Background

Oilfield reinjection water is an effective method for increasing petroleum production, but oilfield water is usually highly mineralized and contains ions of various components, wherein the chloride ion content is not lower than 90%. The water is suitable for various microorganisms, such as Sulfate Reducing Bacteria (SRB) and saprophytic bacteria (TGB). In oilfield reinjection systems, SRB and TGB multiply in large numbers, leading to equipment corrosion and formation plugging. The reinjection water must therefore be sterilized before injection into the well, reducing the SRB and TGB to 10²One per ml. The method for directly electrolyzing water to dissolve the generated chlorine in the water and generating hypochlorous acid to inhibit the growth of bacteria is an effective method in the prior art, and the problem is that a sterilization device which is suitable for the water quality condition of oil fields in China and can continuously and reliably operate is not available.

Disclosure of Invention

The technical problem to be solved by the invention is to provide the high-pressure water injection electrolysis sterilization equipment for the oil field, which can be suitable for the water quality condition of the oil field in China and can continuously and reliably operate. The technical scheme for solving the technical problem is as follows: the utility model provides an oil field high pressure water injection electrolysis sterilization equipment, includes casing, inlet outlet and the negative and positive electrode that is located the casing, characterized by: the casing is internally provided with a fixed electrode and a supporting plate for water flow to pass through, holes for water flow and the fixed electrode are alternately distributed on the supporting plate, a plurality of cathode and anode electrodes pass through the supporting plate and are arranged along the direction of the water flow, and the electrodes with the same polarity are connected in series. Furthermore, the material from which the electrode is made may be graphite or titanium-based ruthenium-plated metal, the electrode being cylindrical in shape. Furthermore, a control circuit for regularly exchanging polarities of the positive and negative electrodes may be provided, and the circuit may have a transformer LB and a rectifier circuitAnd D, the capacitor C, the diode DW and the time relay J are connected in parallel and then are connected in series with the inductor L. In the technical scheme, the positive and negative electrodes arranged in the shell along the water flow direction are surrounded by the overflowing water, when direct current passes through an electrolyte aqueous solution, positive ions with positive charges migrate to a cathode, negative ions with negative charges migrate to the anode, the positive ions reach the cathode, namely, discharge, and the negative charges are lost and become uncharged atoms. Because the mineralization degree of the oil field sewage is very high, the electrolysis overflowing liquid is essentially an electrolysis chlorine salt solution, and chlorine ions are discharged on the anode to become chlorine atoms and become chlorine molecules to escape, namely I.e. using chlorine gas converted by electrolysisThe sterilization is carried out, and the result of the water sample test shows that: the SRB bacteria content is more than 10 in raw water⁸Reduced to 0, TGB bacteria consisting of more than 10⁶0, which reaches the ministerial standard and has no scale layer on the surface of the electrode.

Drawings

FIG. 1 is a cross-sectional view of the present apparatus.

Figure 2 is a cross-sectional view of another embodiment of the apparatus.

Fig. 3 is an enlarged plan view of the support plate.

Fig. 4 is a control circuit diagram of the electrode.

Detailed Description

Referring to fig. 1 to 4, the oil field high pressure water injection electrolysis sterilization equipment of the invention comprises: casing 2, inlet outlet 6, 1 and be located the negative and positive electrode 4 of casing 2, characterized by: be equipped with fixed electrode 4 in the casing 2 and let the backup pad 3 that rivers passed through, the interval distributes on the backup pad 3 and has the hole 7 of crossing water hole 5 and fixed electrode 4, and several negative and positive electrode 4 passes backup pad 3 and sets up along the rivers direction, and this will be favorable to electrode 4 to act on water more fully, and wherein, the same polarity electrode 4 is established ties mutually. The further technical scheme can be as follows: the electrode 4 may be made of graphite or titanium-based ruthenium-plated metal, and the electrode 4 is preferably cylindrical to increase the contact area for the electrolytic reaction and to reduce the scaling of the electrode 4(ii) a The further technical scheme can also be as follows: the circuit is provided with a control circuit for regularly exchanging the polarities of the positive and negative electrodes 4, and the circuit is provided with a transformer LB and a rectifying circuit D, and a capacitor C, a diode DW and a time relay J which are connected in parallel and then connected in series with an inductor L. When the DC stabilized voltage power supply works, input voltage is connected with a rectifier bridge through a transformer LB, and then is output to a DC stabilized voltage power supply circuit for use through filtering (an inductor L, a capacitor C and a voltage stabilizing diode DW). For the time relay J, it is preferable to select the time relay J with the circulation delay function, and adjust the knob thereof to switch the polarity of the electrode 4 according to the selected time, i.e. the original normally closed contact J1 is switched to the normally open contact J2, and at the same time, the normally closed contact J1 is switched to the break point, thereby realizing the mutual switching of the cathode and the anode of the electrode 4. The polarity of the cathode and the anode can be automatically switched once at regular time (or manually) by setting the period of every 2-12 hours generally so as to remove the thin scale formed on the surface of the original cathode by calcium salt and magnesium salt in the sewage. In addition, the recommended use conditions of the equipment are as follows: electrode voltage is 3-18V, current is 6-30A, andwater injection flow is 1-18 m³/hr。

The support plate 3 may be made of an insulating material, such as: polyvinyl chloride.

Claims

The utility model provides an oil field high pressure water injection electrolysis sterilization equipment, includes casing (2), inlet outlet (6, 1) and is located negative and positive electrode (4) of casing (2), characterized by: the casing (2) is internally provided with a fixed electrode (4) and a support plate (3) for water flow to pass through, holes (5) for water to pass through and holes (7) for fixing the electrode are distributed on the support plate (3) at intervals, a plurality of cathode and anode electrodes (4) pass through the support plate (3) and are arranged along the direction of the water flow, wherein the electrodes (4) with the same polarity are connected in series.
2. The sterilization apparatus as set forth in claim 1, wherein: the material for manufacturing the electrode (4) is graphite or titanium-based ruthenium-plated metal, and the electrode (4) is cylindrical.
3. The sterilization apparatus according to claim 1 or 2, wherein: the circuit is provided with a control circuit for regularly exchanging the polarities of the positive electrode and the negative electrode (4), and the circuit is provided with a transformer (LB) and a rectifying circuit (D), and a capacitor (C), a Diode (DW) and a time relay (J) which are connected in parallel and then connected in series with an inductor (L).