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Chemical flooding alternate injection method

A technology of alternating injection and chemical flooding, which is used in earth-moving drilling, production of fluids, wellbore/well components, etc., can solve the problems of low production degree of low-permeability oil layers, low effective utilization rate, uneven distribution of injection volume, etc. The effect of improving the effective utilization rate, increasing the liquid absorption, and increasing the recovery factor

Inactive Publication Date: 2011-02-16
DAQING OILFIELD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of unbalanced distribution of injection volume, greatly reduced effective utilization rate and low production degree of low permeability oil layers caused by the general injection method of the existing three-component compound system, and provides a chemical flooding alternate injection method

Method used

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  • Chemical flooding alternate injection method

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specific Embodiment approach 1

[0009] Embodiment 1: A chemical flooding alternate injection method in this embodiment is as follows: 1. Inject polymer slug A with a polymer molecular weight of 20 million to 30 million and a polymer concentration of 1600 mg / L to 2000 mg / L. 10% of the pore volume; 2. The polymer molecular weight is 10 million to 19 million, the polymer concentration is 500 mg / L to 1000 mg / L, the surfactant mass concentration is 0.2% to 0.3%, and the alkali mass concentration is 1.0% to 1.2% ternary slug, inject 10% of the pore volume; 3. Repeat step 1 and step 2 3 to 4 times; The polymer slug B of L is injected into 10%~12.5% ​​of the pore volume, namely completes the injection of chemical flooding; the surfactant described in step 2 is alkylbenzene sulfonate, and the alkali described in step 2 is hydrogen sodium oxide.

[0010] The polymer in this embodiment is mainly used to improve the macroscopic sweep efficiency and penetrate into the high-permeability layer more, and the polymer in the...

specific Embodiment approach 2

[0011] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the molecular weight of the polymer in the polymer slug A described in step 1 is 25 million. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0012] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the polymer concentration in the polymer slug A in step 1 is 1800 mg / L. Others are the same as in the first embodiment.

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Abstract

The invention discloses a chemical flooding alternate injection method, relates to optimization of a chemical flooding injection mode, and solves the problems of imbalanced distribution of injection rate, greatly reduced effective utilization ratio and low low-permeability oil layer producing degree simultaneously caused by the conventional ternary compound system general injection. The method comprises the following steps of: 1, injecting polymer plug A into the pore until the polymer plug A is in amount which is 10 percent of pore volume; 2, injecting ternary plug into the pore until the ternary plug is in an amount which is 10 percent of pore volume; 3, repeating the step 1 and the step 2 for 3 to 4 times; and 4, injecting polymer plug B into the pre until the polymer plug B is in an amount which is 10 to 12.5 percent of pore volume to finish chemical flooding injection. Compared with the general injection mode, the chemical flooding injection method of the invention has the advantages that: compound system expansion wave and volume effect are enhanced, the liquid absorption of a chemical agent by a low-permeability layer is improved, the effective utilization ratio of the chemical agent is improved and the yield is further improved by about 5 percent indoors under the condition of the same using amount.

Description

technical field [0001] The invention relates to the optimization of a chemical flooding injection mode. Background technique [0002] The injection method used in the compound flooding field test carried out in Daqing Oilfield is the general injection of alkali, surfactant and polymer ternary compound system. The results of combined injection and separate mining parallel experiments of ternary system in three layers of artificial homogeneous cores with different permeability show that the distribution of injection volume of ternary system in high, medium and low permeability layers presents a large degree of imbalance, and the high The cumulative injection volume of the permeable layer is much larger than that of the middle and low permeability layers, and this phenomenon is also evident in the composite flooding field test. At present, the remaining geological reserves of the second-type oil layers in Daqing Oilfield are large, and the permeability difference of the second...

Claims

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Application Information

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IPC IPC(8): E21B43/22
Inventor 王凤兰伍晓林陈广宇田燕春赵新李星刘春天姜彬
Owner DAQING OILFIELD CO LTD
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