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Intercalation polymer gel diversion agent

A technology of polymer and diverting agent, applied in drilling composition, production fluid, wellbore/well components, etc., can solve the problems that restrict the large-scale application and popularization of diverting technology, high sensitivity and high cost, and achieve improvement Water injection profile, improved sweep efficiency, low cost effect

Active Publication Date: 2012-11-28
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the conventional gel steering technology used in oil fields has achieved good results in practical applications, but there are still some problems. Although the gel has a certain gel strength, it can change the water-oil mobility ratio and improve the sweep efficiency of injected water. However, there are still some deficiencies in gel-type diverting agents. For example, a large amount of residual oil will still remain in the pores. The cost of current deep fluid diverting agents is high, and the gel-forming performance is highly sensitive to conditions such as water quality and temperature, which restricts diversion. Large-scale application and promotion of technology

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preparation example Construction

[0029] The preparation method of intercalated polymer gel diverting agent is as follows:

[0030] 1. Preparation of intercalation polymer aqueous solution

[0031] Because the molecular weight of the intercalation polymer is relatively high, the intercalation polymer solution with a concentration of 1wt% should be prepared at first for use: when preparing, first weigh 10g of the intercalation polymer, and then measure 1000ml of simulated brine. Under stirring, gradually add the intercalation polymer to the simulated brine to dissolve it, and obtain the intercalation polymer solution for use; it should be noted that the prepared intercalation polymer solution must be matured for 24 hours before use.

[0032] 2. Preparation of crosslinking agent solution

[0033] Prepare a cross-linking agent aqueous solution with a concentration of 10wt%. When preparing, weigh 1g of chromium lactate, 1g of chromium acetate, and 1g of an alkaline cross-linking agent, mix them with 10ml of water...

Embodiment 1

[0049] This embodiment provides a kind of intercalation polymer gel steering agent, which is prepared through the following steps:

[0050] Add 20 parts of acrylamide, 1 part of modified inorganic clay mineral, and 78.8 parts of deionized water into a four-necked bottle, blow nitrogen gas at 12°C for 30 minutes, add 0.2 parts of initiator, and polymerize to obtain an intercalation polymer, wherein, The initiator is made up of ammonium persulfate and sodium sulfite, and the weight ratio of ammonium persulfate to sodium sulfite is 1.5:1;

[0051] Add 0.15 parts of intercalation polymer, 0.1 part of cross-linking agent chromium acetate, 0.005 part of regulator oxalic acid (oxalic acid is used to adjust the pH value of the intercalation polymer gel system, control the gelation time, and can be added according to the length of gelation time Appropriate amount of oxalic acid) was added to 100 parts of Daqing Oilfield simulated brine, stirred at high speed (1000 rpm) for 120 minutes ...

Embodiment 2

[0054] This embodiment provides a kind of intercalation polymer gel steering agent, which is prepared through the following steps:

[0055] Add 23 parts of acrylamide, 2 parts of modified inorganic clay minerals, and 74.8 parts of deionized water into a four-necked bottle, blow nitrogen gas at 12°C for 30 minutes, add 0.2 parts of initiator, and copolymerize to obtain an intercalation polymer. Among them, The initiator is made up of ammonium persulfate and sodium sulfite, and the weight ratio of ammonium persulfate to sodium sulfite is 1.8:1;

[0056] Add 0.2 parts of intercalation polymer, 0.10 part of cross-linking agent chromium acetate, and 0.01 part of regulator oxalic acid to 100 parts of Daqing Oilfield simulated brine, and stir at high speed (1000 rpm) for 120 minutes to obtain intercalation polymer gel steering Agent 2A (viscoelastic weak gel diverting agent), or add 0.2 parts of intercalation polymer and 0.19 parts of basic crosslinking agent to 100 parts of Daqing O...

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Abstract

The invention relates to an intercalation polymer gel diversion agent. The intercalation polymer gel diversion agent includes the following components by weight: 0.15-0.5 parts of an intercalation polymer, 0.05-0.2 parts of a crosslinking agent, and 99.8-99.3 parts of water, wherein, the intercalation polymer includes the following components by weight: 20-25 parts of acrylamide, 1-7 parts of modified inorganic clay minerals, 67.7-78.9 parts of water, and 0.1-0.3 parts of an initiator. The gel diversion agent provided by the invention gel takes the intercalation polymer as a main component, and simultaneously the crosslinking agent is added to obtain the intercalation polymer gel diversion agent. The gel diversion agent can improve the water injection profile and improve the water injection recovery efficiency. Further, the gel diversion agent has a certain strength and adjustable gel time, and also has a relatively low cost compared with the same type of gel diversion agents.

Description

technical field [0001] The invention relates to a steering agent used in oil field water injection operations, in particular to an intercalation polymer gel steering agent, which belongs to the technical field of oil recovery in oil fields. Background technique [0002] In oilfield water flooding, what is injected is a gel cross-linking system, which is a gel cross-linking system with a three-dimensional network structure formed by a certain concentration of polymer and a cross-linking agent. Driven by the injected water, it will slowly move forward as a whole, thus having the effect of turning the deep liquid flow. [0003] Weak gel diverting agent is one of the techniques for stabilizing oil and controlling water in old oilfields. At present, there are a large number of laboratory researches and field tests at home and abroad, and very significant production increase effects and economic benefits have been achieved. [0004] At present, the conventional gel steering techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/588E21B43/22
Inventor 冯爱丽张松白胤杰王洪关熊春明
Owner PETROCHINA CO LTD
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