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Single-pump single-well weak alkali ternary injection device with two-stage concentration regulation and application method thereof

An injection device and concentration technology, applied in the direction of earthwork drilling, wellbore/well components, production fluid, etc., can solve the problems of large viscosity loss, large concentration error, etc., to reduce the risk of failure, reduce concentration error, reduce viscosity loss effect

Active Publication Date: 2017-09-08
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] The present invention provides a single-pump, single-well, two-stage concentration-adjusted weak base three-way injection device and its use method, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the ground purpose of the existing weak base three-way injection process The problem of large loss of liquid viscosity and large concentration error

Method used

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  • Single-pump single-well weak alkali ternary injection device with two-stage concentration regulation and application method thereof
  • Single-pump single-well weak alkali ternary injection device with two-stage concentration regulation and application method thereof
  • Single-pump single-well weak alkali ternary injection device with two-stage concentration regulation and application method thereof

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Effect test

Embodiment 1

[0037] Embodiment 1: as attached Figure 4 To attach Figure 5 As shown, the single-pump, single-well, two-stage concentration-adjusted weak alkali three-way injection device includes AS storage tank 1, S storage tank 2, SP storage tank 3 and PLC controller. The AS storage tank 1 is provided with an alkali mother liquor inlet 5 , the first surfactant mother liquor inlet 6 and the first water inlet 7, the S storage tank 2 is provided with the second surfactant mother liquor inlet 8 and the second water inlet 9, and the SP storage tank 3 is provided with the polymer mother liquor Inlet 10, the third surfactant mother liquor inlet 11 and the third water inlet 12; the SP mixed liquid main pipeline 13 is fixedly installed at the liquid outlet of the SP storage tank 3, and the outlet end of the SP mixed liquid main pipeline 13 is connected in series with The first booster pump 14 is fixedly connected with at least one SP mixed liquid branch line 15 on the SP mixed liquid main line ...

Embodiment 2

[0056] Embodiment 2: as attached Figure 4 to attach Figure 5 As shown, the use method of the single-pump, single-well two-stage concentration-adjusted weak alkali three-way injection device is carried out as follows: the alkali mother liquor, the surfactant mother liquor and water respectively pass through the corresponding alkali mother liquor inlets 5, the first surface The active agent mother liquid inlet 6 and the first water inlet 7 enter the AS storage tank 1 and mix evenly to obtain the AS mixed liquid. The surfactant concentration in the AS mixed liquid is the injection concentration of the surfactant, and the surfactant mother liquid and water pass through the The corresponding second surfactant mother liquor inlet 8 and the second water inlet 9 enter the S storage tank 2 and mix uniformly to obtain the S solution. The surfactant concentration in the S solution is the same as the surfactant concentration in the AS mixed solution. The polymer mother liquor, the surf...

Embodiment 3

[0063] Embodiment 3: As an optimization of Embodiment 2, in order to further reduce the viscosity loss and concentration error of the target liquid on the surface, the first flow meter 27 sends the flow data to the PLC controller, and the PLC controller injects according to the flow rate of the injection well and the first flow rate The flow data fed back by the meter 27 controls the opening of the first electric valve 26 .

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Abstract

The invention relates to the technical field of weak alkali ternary injection distribution processes, in particular to a single-pump single-well weak alkali ternary injection device with two-stage concentration regulation and an application method thereof. The single-pump single-well weak alkali ternary injection device with two-stage concentration regulation comprises an AS (alkali-surfactant) storage tank, an S storage tank, an SP (surfactant-polymer) storage tank and a PLC (programmable logic controller); the AS storage tank is provided with an alkali mother liquid inlet, a first surfactant mother liquid inlet and a first water inlet, and the S storage tank is provided with a second surfactant mother liquid inlet and a second water inlet. The single-pump single-well weak alkali ternary injection device with two-stage concentration regulation and the application method thereof have the advantages that viscosity loss and concentration error of a surface target liquid can be decreased, the concentration of a polymer can be regulated flexibly by injecting surfactant solution, an alkali and a surfactant are distributed at a low-pressure end so that the prepared AS mixed liquid has uniform and stable alkali concentration, and the alkali concentration instability problem due to drip mixing of the alkali and surfactant at the high-pressure water end in the prior art is solved.

Description

technical field [0001] The invention relates to the technical field of weak base ternary dispensing technology, and relates to a single-pump, single-well, two-stage concentration-adjustment weak base ternary device and a use method thereof. Background technique [0002] With the continuous popularization of oilfield ASP flooding and oil recovery development, the weak base ASP flooding development surface technology in old sandstone reservoirs has become mature, and some conglomerate reservoirs with strong heterogeneity are gradually adopting weak base ASP flooding. Elementary compound flooding is developed to increase its recovery factor and control the decline rate of old oilfields, but the injection pressure difference, injection concentration and injection rate are different at each injection stage of injection wells in heterogeneous reservoirs. When the traditional sandstone reservoir weak alkali three-component injection technology is used in conglomerate reservoirs wit...

Claims

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Application Information

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IPC IPC(8): E21B43/22
CPCE21B43/16
Inventor 李龙黄强张侃毅夏新宇戚亚明郑德旺赵美刚辜新军丁明华蒋程彬赵文恒邓骏张腾唐治国张清应侯文刚吕强
Owner BC P INC CHINA NAT PETROLEUM CORP
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