Enhanced plugging gel and preparation method thereof

An enhanced, gel-based technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of difficult to achieve effective plugging and low jelly strength, so as to improve the success rate and pressure bearing capacity, and improve Effect of jelly strength and shear toughness, excellent penetrating ability

Pending Publication Date: 2020-08-25
SICHUAN GREDIS PETROLEUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

One of the more difficult tasks is that the strength of the jelly is low after gelation, and it is difficult to achieve effective sealing under the fluctuating pressure during the drilling process

Method used

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  • Enhanced plugging gel and preparation method thereof
  • Enhanced plugging gel and preparation method thereof
  • Enhanced plugging gel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve 0.1wt% of thiourea in clear water, then add 0.8wt% of acrylamide and tert-butyl acrylate (PAtBA) with a molecular weight of 1.5 million and a degree of hydrolysis of 10wt% and 2wt% of 50nm silica powder , 1.2wt% 40-80 mesh walnut shell powder, 3wt% water-soluble phenolic resin cross-linking agent are fully mixed and dispersed into clean water, and continuously stirred for 0.5-1h to fully dissolve in the circulation temperature of 20-60°C to enhance The enhanced plugging gel base liquid is cross-linked for 2-12 hours to obtain the enhanced plugging gel material.

Embodiment 2

[0025] Dissolve 0.2wt% sodium bisulfite in clear water. Then, 1.5wt% of acrylamide with a molecular weight of 1 million and a degree of hydrolysis of 15wt% is cross-linked with acrylic acid and 3wt% of 40nm titanium dioxide powder, 3wt% of 40-80 mesh coconut shell powder, and 2.5wt% of water-soluble phenolic resin After the agent is fully mixed, it is dispersed into clear water, and it is continuously stirred for 0.5-1h to fully dissolve it at a circulating temperature of 90°C to obtain an enhanced plugging gel base fluid, which is cross-linked for 2-12h Finally, the enhanced plugging gel material is obtained.

Embodiment 3

[0027] The enhanced plugging gel base fluid prepared in Example 1 was subjected to a high temperature and high pressure thickening test at 90°C and 40 MPa, and the crosslinking time was 200 minutes. The test results are as follows: figure 1 shown. From figure 1 It can be seen that under the dual effects of the existing cross-linking agent and composite reinforcing agent, on the one hand, the controllability of the cross-linking time of the gel is taken into account; The strength is effectively improved.

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Abstract

The invention discloses enhanced plugging gel and a preparation method thereof. The enhanced plugging gel is prepared from, by weight, 0.5%-2% of a polyacrylamide polymer, 2%-5% of a nano enhancer, 1%-3% of a fiber enhancer, 0.1%-5% of a cross-linking agent and 0.1%-0.5% of an antioxidant, with the balance being water. The preparation method comprises the following steps: firstly, dissolving the antioxidant in water; then sequentially dispersing the polyacrylamide polymer, the nano enhancer, the fiber enhancer and the cross-linking agent into water, and uniformly mixing to obtain a reinforcedplugging gel base solution; and carrying out a cross-linking reaction on the enhanced plugging gel base solution for 2-12 hours to obtain the enhanced plugging gel. According to the invention, inorganic nanoparticles and a fiber composite admixture are introduced into a cross-linked polymer network system, and the polymer gel can have the characteristics of high gelatinizing strength, high shear toughness and the like under a high-temperature condition by virtue of the hydrogen-bond interaction formed by the admixture and a gel network, so that the plugging and pressure-bearing capacities of the plugging gel are improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploitation, in particular to an enhanced plugging gel and a preparation method thereof. Background technique [0002] Lost circulation is one of the most serious problems in drilling operations. Drilling fluid is lost in natural or induced fractures when high-density mud is used to overcome formation pressure. Frequent lost circulation will prolong the non-productive time of drilling, and the average cost is about 15% of that of high-temperature and high-pressure wells. Abnormal conditions such as ultrahigh pressure, existence of fractures, and drilling in depleted reservoirs narrow the mud density window between pore pressure and fracturing gradient, making formations vulnerable to damage by high-density mud. [0003] The plugging operation usually involves pumping the plugging material to the leaky zone through pumping equipment, and after the plugging material forms an effective seal in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467
CPCC09K8/467
Inventor 张洪旭张超韦青青汤卫华郭振斌
Owner SICHUAN GREDIS PETROLEUM TECH CO LTD
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