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In-section multi-cluster fracturing transformation nonlinear self degradation temporary plugging agent and preparation method thereof

A non-linear, self-degrading technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as affecting pumping, slow and uniform dissolution, and difficult to decompose, so as to improve compressive strength, improve adhesion, The effect of improving the sealing performance

Inactive Publication Date: 2019-01-18
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The fracturing temporary plugging agent products represented by the above-mentioned patents mainly have two aspects of oil dissolution and water dissolution. The temporary plugging agent dissolves slowly and uniformly in the corresponding medium, and the oil-dissolving temporary plugging agent has a high crushing rate under pressure. If it is dissolved in water and placed in water, it will stick to each other, affecting pumping, and it is not easy to decompose after sand plugging in the reservoir, which increases the construction risk

Method used

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  • In-section multi-cluster fracturing transformation nonlinear self degradation temporary plugging agent and preparation method thereof
  • In-section multi-cluster fracturing transformation nonlinear self degradation temporary plugging agent and preparation method thereof
  • In-section multi-cluster fracturing transformation nonlinear self degradation temporary plugging agent and preparation method thereof

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Embodiment 1

[0034] The invention provides a non-linear self-degradable temporary plugging agent for intra-stage multi-cluster fracturing reconstruction, which is composed of the following substances in weight percentage: 85% of the body, 5% of the initiator, 2% of the lubricant, 5% of the forming agent, and a reinforcing agent 0.4%, pro-degradant 2.6%, wherein, the body is a mixture of polyglycolide, polylactide-glycolide and polyvinyl alcohol.

[0035] Preparation process: Step 1) Put the formulated amount of the body into the batch stirring reactor and raise the temperature to 80°C, then add the formulated amount of initiator to react for 20 minutes, then add the formulated amount of forming agent to react for 10 minutes, and then add the formulated amount of lubricant The agent was reacted for 30 minutes, and then the formulated amount of enhancer was added to react for 10 minutes, and finally the formulated amount of degradant was added to react for 20 minutes;

[0036] Step 2) Raise ...

Embodiment 2

[0040] The invention provides a non-linear self-degradable temporary plugging agent for multi-cluster fracturing transformation in a stage, which is composed of the following substances in weight percentage: 85% of the body, 2% of the initiator, 3% of the lubricant, 7% of the forming agent, and a reinforcing agent 0.5%, degradation accelerator 2.5%, wherein, the body is a mixture composed of polyglycolide, polylactide-glycolide and polyvinyl alcohol.

[0041] In this embodiment, the body is composed of 20% by weight of polyglycolide, 50% by weight of polylactide-glycolide and 15% by weight of polyvinyl alcohol; the initiator is maleic acid di octyl ester; the lubricant is isopropanol and n-butanol, and the mass percentages are 1% and 2% respectively; the molding agent consists of 4% by weight of methyl methacrylate grafted starch and 3% by weight of β-cyclodextrin Composition; Reinforcing agent is made up of the nano-silicon dioxide of 0.3% by weight and the nano-alumina of 0....

Embodiment 3

[0046] The invention provides a non-linear self-degradable temporary plugging agent for multi-cluster fracturing reconstruction in a stage, which is composed of the following substances in weight percentage: 80% of the body, 5% of the initiator, 5% of the lubricant, 6.2% of the forming agent, and a reinforcing agent 0.8%, pro-degradant 3%, wherein, the body is a mixture composed of polyglycolide, polylactide-glycolide and polyvinyl alcohol.

[0047] In this embodiment, the body is composed of 20% by weight of polyglycolide, 50% by weight of polylactide-glycolide and 10% by weight of polyvinyl alcohol; the initiator is composed of maleic acid di A mixture of octyl esters, dibutyl phthalate and dioctyl maleate, the weight percentages are 2%, 2% and 1% respectively; the lubricant is isopropanol and n-butanol, the weight percentages are 3% respectively % and 2%; forming agent consists of 4% by weight of methyl methacrylate grafted starch and 2.2% by weight of β-cyclodextrin; reinf...

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Abstract

The invention provides an in-section multi-cluster fracturing transformation nonlinear self degradation temporary plugging agent and a preparation method thereof. The in-section multi-cluster fracturing transformation nonlinear self degradation temporary plugging agent is prepared from the following substances in percentage by weight: 80 to 90 percent of body, 2 to 5 percent of initiators, 2 to 5percent of lubricating agents, 5 to 10 percent of shaping agents, 0.2 to 0.8 percent of enhancing agents and 1 to 3 percent of degradation accelerating agents, wherein the body is a mixture formed bypolyglycolide, polylactide-glycolide and polyvinyl alcohol; bonding cannot occur after the water meeting at the normal temperature; pumping injection is facilitated; the degradation in a limited timeis slow; the dissolution speed at the reservoir temperature and the time show the nonlinear relationship; the technical requirements of multi-cluster fracturing construction in the horizonal well section can be met; the micro expansion capability is realized; the intensity at the later plugging stage in a crack is improved; the slow degradation can also be realized under the condition of the medium environment change; the harm to the reservoir is small. Through the combination of an intermittent stirring reactor and a double-screw extruding machine, the influence of the temperature change of the production process on the temporary plugging agent product is improved; the product physical and chemical property index is more stable.

Description

technical field [0001] The invention belongs to the technical field of gas field fracturing stimulation technology, and in particular relates to a non-linear self-degradation temporary plugging agent for multi-cluster fracturing transformation in a section and a preparation method thereof. Background technique [0002] With the continuous development of oil and gas fields, the quality of reservoirs has been declining year by year. Various oilfields have strengthened the methods of reservoir fracturing and reconstruction, and continuously improved the level of fracturing and reconstruction of low-permeability tight oil and gas reservoirs. Horizontal well staged multi-cluster fracturing stimulation method has gradually become an important technical method for low-permeability oil and gas field stimulation. However, there is a problem of low opening rate of multi-cluster perforation during construction, the degree of reservoir stimulation is limited, and the stimulation effect i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/514
CPCC09K8/5083C09K8/514C09K2208/18C09K2208/34
Inventor 蒋文学王坤李勇吴增智宋振云李志航郑维师金娜万向辉王所良武月荣李珊李文彬尹虎琛
Owner BC P INC CHINA NAT PETROLEUM CORP
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