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Seepage formation sealant for controlling peek-shaped water absorption in water injection well

A water injection well and plugging agent technology, which is applied in the field of chemical treatment agents and penetration plugging agents, can solve the problems of short validity period, poor injection water sweep effect, rising water content of oil wells, etc., and achieve consistent water absorption capacity and uniform water absorption effect

Active Publication Date: 2012-07-18
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, some ultra-low permeability reservoirs in Changqing have developed fractures. During the water injection development process, due to the serious heterogeneity of the reservoirs, there are differences in the permeability between layers (or layers) of water injection wells, so the starting pressure of water absorption in each layer and The amount of water absorption is different. The injected water flows along the high permeability zone, and the water absorption profile shows peak-like water absorption, and even finger-like water absorption in severe cases, resulting in poor sweeping effect of injected water and rapid rise of water cut in oil wells
The existing basic methods for adjusting the water absorption profile of water injection wells include injecting particles and suspended solids, using physical plugging methods to block high-permeability sections, and using chemical plugging agents. Commonly used are vegetable glue and polymer gel. The disadvantage of these chemical plugging agents is that they completely seal off the seepage channels of the oil layer, or only play a plugging role for a short time, and the validity period is very short

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The weight percentage of each component of the osmotic plugging agent used to control the peak-shaped water absorption of water injection wells is:

[0029] 1. Acrylamide monomer, 15%;

[0030] 2. Polyammonium methacrylate, 0.4%;

[0031] 3. N-N methylenebisacrylamide, 0.3%;

[0032] 4. Ammonium persulfate, 1.5%;

[0033] 5. Ceramsite proppant for fracturing with 50-70 mesh, 10%;

[0034] 6. Foaming agent: alkyl glycoside, 0.03%;

[0035] 7. Water, 72.77%.

[0036] Application of this embodiment:

[0037] Under indoor conditions, each component was weighed with a balance. Add 150g of acrylamide monomer and 4g of sodium polymethacrylate to 727.7g of clear water, stir at high speed for 5 minutes, then add 3g of N-N methylenebisacrylamide and 100g of ceramsite proppant for fracturing, 50-70 mesh; Mix evenly, add 15g of ammonium persulfate and mix evenly at high speed, place in a 55°C water bath to initiate the polymerization of organic monomers, and after the cerams...

Embodiment 2

[0039] The weight percentage of each component of the penetrating plugging agent used for water injection wells to absorb water in a peak shape is:

[0040] 1. Acrylamide monomer, 15%;

[0041] 2. Sodium polymethacrylate, 0.5%;

[0042] 3. N-N methylenebisacrylamide, 0.3%;

[0043] 4. Ammonium persulfate, 1.2%;

[0044] 5. Ceramsite proppant for fracturing with 50-70 mesh, 10%;

[0045] 6. Foaming agent: alkyl glucoside (0810), 0.02%;

[0046] 7. The rest is water (72.98%). The sum of the weight percentages of each component is 100%.

[0047] Application of this embodiment: each component is by mass.

[0048] The 1# implementation well is a water injection well, the reservoir temperature is 60°C, and the water absorption profile is measured as a peak-shaped water absorption. Under high-speed stirring conditions at 1.4596m 3 Add 300kg of acrylamide monomer and 10kg of polysodium methacrylate to clean water, stir at high speed for 5 minutes, add 6kg of N-N methylenebisac...

Embodiment 3

[0050] The weight percentage of each component of the penetrating plugging agent used for water injection wells to absorb water in a peak shape is:

[0051] 1. Acrylamide monomer, 16%;

[0052] 2. Sodium polymethacrylate, 0.4%;

[0053] 3. N-N methylenebisacrylamide, 0.4%;

[0054] 4. Ammonium persulfate, 1.7%;

[0055] 5. Ceramsite proppant for fracturing with 50-70 mesh, 8%;

[0056] 6. Foaming agent: alkyl glucoside (0810), 0.03%;

[0057] 7. The rest is water (73.47%). The sum of the weight percentages of each component is 100%.

[0058] Application of this embodiment: each component is by mass.

[0059] The 2# implementation well is a water injection well, the reservoir temperature is 52°C, and the water absorption profile is measured as a peak-shaped water absorption. After the raw materials and equipment are prepared on-site, under the condition of high-speed stirring, the 3 Add 320kg of acrylamide monomer and 8kg of polysodium methacrylate to clean water, stir at...

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PUM

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Abstract

A seepage formation sealant for controlling peek-shaped water absorption in a water injection well is applied to the water injection process in an oil field or an oil well, is seepage formation sealing for controlling peek-shaped water absorption in the water injection well, and is characterized by comprising the following materials by weight percent: 10 to 20 percent of acrylamide monomer, 0.3 to 0.5 percent of sodium polymethacrylate, 0.2 to 0.5 percent of N-N methylene-bisacrylamide, 1.0 to 2.0 percent of ammonium persulfate, 5 to 15 percent of 50 to 70 mesh methylene-bisacrylamide for objective fracturing, 0.01 to 0.05 percent of foaming agent (alkyl glycoside), and water in balancing amount. The seepage formation sealant has the effects that filtration is carried out on the water absorption peek section of a reservoir bed, a high-seepage section is blocked effectively after polymerization reaction, a certain fluid permeability is reserved, and the permeability of a low seepage section is reduced slightly, so that the waste-absorbing capacities in the length wise direction of a thick oil pay are approximately the same to realize uniform water absorption.

Description

technical field [0001] The invention relates to the technical field of oil well water injection in oil fields, in particular to a chemical treatment agent for downhole oil reservoir protection, and is a permeation sealing agent suitable for controlling peak-shaped water absorption in water injection wells. Background technique [0002] At present, some ultra-low permeability reservoirs in Changqing have developed fractures. During the water injection development process, due to the serious heterogeneity of the reservoirs, there are differences in the permeability between layers (or layers) of water injection wells, so the starting pressure of water absorption in each layer and The amount of water absorption is different. The injected water flows along the high permeability zone, and the water absorption profile shows peak-like water absorption, and even finger-like water absorption in severe cases, resulting in poor sweeping effect of injected water and rapid rise of water cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/44
Inventor 赵继勇常彦荣陆红军李建山齐银顾燕凌殷桂琴吴甫让李楷王建麾范鹏吕昌盛何衡
Owner PETROCHINA CO LTD
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