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Re-use agent for polymer after driving and injecting method thereof

A technology of polymers and fixatives, applied in drilling compositions, chemical instruments and methods, earthwork drilling and production, etc., can solve near-wellbore blockage, influence of deep profile control, influence of fixative injection and deep profile control Function and other issues

Inactive Publication Date: 2007-10-24
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to effectively change the flow direction of formation fluid, profile control should be carried out in the far well zone (i.e. deep profile control), so the above-mentioned fixatives and flocculants have the following disadvantages: ①The above-mentioned fixatives are all single-liquid fixatives, When it meets the polymer, it acts as a cross-linking effect. If it is injected immediately after polymer flooding, it will cause blockage in the near-wellbore zone, which will affect the subsequent injection of fixative and the performance of deep profile control; ②The above-mentioned flocculant solid particles have A certain subsidence has an influence on the use of residual polymers in deep formations for deep profile control

Method used

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  • Re-use agent for polymer after driving and injecting method thereof
  • Re-use agent for polymer after driving and injecting method thereof
  • Re-use agent for polymer after driving and injecting method thereof

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Embodiment Construction

[0012] The present invention will be described in detail below in conjunction with the examples.

[0013] Since the fixative is suitable for formation residual polymer mass concentration exceeding 800mg·L -1 Formation, while the flocculant can be in the polymer mass concentration of 200 ~ 800mg L -1 Flocculation can still be performed within the range, so the fixative should be injected first, followed by the flocculant.

[0014] Under normal circumstances, the total amount of fixative required to penetrate the formation with a thickness of 1m is 40-80m 3 , the volume ratio of the two working fluids is (0.8-1.2): 1. The amount of flocculant required to penetrate the formation with a thickness of 1m is 140-180m 3 .

[0015] The volume of spacer fluid injected between the two working fluids is determined by the following formula:

[0016] V = π ( R 2 2 - ...

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Abstract

The invention discloses a reusing agent of residual ground polymer driven by polymer as well as injecting method, which is characterized by the following: adopting double-liquid method fixation agent and modified calcium soil as flocculant; allocating the fixation agent with 0. 09%-0. 54% Na2Cr2O7 solution and 0. 16%-0. 96% Na2SO3 solution with bulk rate at (0. 8-1. 2):1; making the flocculant as modified calcium soil added by Na2CO3 and NaHCO3. The injecting method comprises the following steps: injecting Na2Cr2O7 solution first and insulating liquid separately; injecting Na2SO3 solution and flocculant; injecting water normally. The invention can do deep adjusting and dissect for residual ground polymer, which can change the flowing direction of ground flow effectively and improves the recovery efficiency after driving by polymer.

Description

Technical field: [0001] The invention relates to a technology for further enhancing crude oil recovery in the technical field of oil and gas field development engineering, in particular to a technology for deep profile control by using residual polymer in formations after polymer flooding to enhance crude oil recovery. technical background: [0002] In oil fields, a large amount of polymer remains in the formation after polymer flooding. According to statistics, at the end of polymer flooding, 75% to 85% of the injected polymer remains in the formation, mainly in the form of dissolution, adsorption and capture. [0003] At present, it has been proposed to inject polymer reuse agents (including fixatives and flocculants) into the formation to fix and flocculate the residual polymer in the high-permeability layer to play a role in profile control. By changing the flow direction of the formation fluid, the polymer The swept volume of the follow-up water flooding after flooding...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/60E21B43/22
Inventor 赵福麟戴彩丽王业飞
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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