Single-pump, single-well, two-stage concentration adjustment weak base three-way injection device and its application method

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

Active Publication Date: 2019-04-26
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • 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, two-stage concentration adjustment weak base three-way injection device and its application method
  • Single-pump, single-well, two-stage concentration adjustment weak base three-way injection device and its application method
  • Single-pump, single-well, two-stage concentration adjustment weak base three-way injection device and its application method

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Example 1: as attached Figure 4 to the attached Figure 5 As shown, the single-pump and single-well two-level concentration deployment weak alkali ternary injection device includes AS storage tank 1, S storage tank 2, SP storage tank 3 and PLC controller, and 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, are provided with the second surfactant mother liquor inlet 8 and the second water inlet 9 on the S storage tank 2, and are provided with the polymer mother liquor on the SP storage tank 3 The inlet 10, the third surfactant mother liquor inlet 11 and the third water inlet 12; the SP mixed liquid main line 13 is fixedly installed at the liquid outlet of the SP storage tank 3, and the outlet end of the SP mixed liquid main line 13 is connected in series with The first booster pump 14 is fixedly connected with at least one SP mixed solution branch line 15 on the SP mixed so...

Embodiment 2

[0056] Example 2: as attached Figure 4 to the attached Figure 5 As shown, the using method of this single pump single well two-level concentration allocation weak base ternary injection device is carried out according to the following method: alkali mother liquor, surfactant mother liquor and water respectively pass through the corresponding alkali mother liquor inlet 5, the first surface The active agent mother liquor inlet 6 and the first water inlet 7 enter the AS storage tank 1 and mix evenly to obtain an AS mixed solution. The surfactant concentration in the AS mixed solution is the injection concentration of the surfactant, and the surfactant mother liquor and water pass through respectively. The corresponding second surfactant mother liquor inlet 8 and the second water inlet 9 enter into the S storage tank 2 and obtain the S solution after mixing uniformly, and the surfactant concentration in the S solution is the same as the surfactant concentration in the AS mixed s...

Embodiment 3

[0063] Example 3: As the optimization of Example 2, in order to further reduce the viscosity loss and concentration error of the ground purpose liquid, the first flow meter 27 sends the flow data to the PLC controller, and the PLC controller injects the requirements according to the injection well flow rate and the first flow rate. The flow rate 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 and single well two-stage concentration blending weak base ternary device and a method for using the same. Background technique [0002] With the continuous promotion of ASP flooding in oilfields, the surface technology for weak-alkali ASP flooding development in old sandstone reservoirs has become mature, and some conglomerate reservoirs with strong heterogeneity have gradually adopted weak-alkali Elemental compound flooding has been developed to improve its recovery and control the decline rate of old oilfields. However, injection wells in heterogeneous oil reservoirs have large injection pressure differences, large changes in injection concentration and different injection amounts at each injection stage. When the traditional weak-alkali ternary injection process for sandstone reservoirs is used in conglomerate reservoirs with strong...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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