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Oil and gas well production increasing method

A technology for oil and gas wells and near-wellbore, which is applied in earth-moving drilling, wellbore/well components, and production fluids, etc. It can solve the problems of near-wellbore fracture conductivity loss, high cost and high risk, and improve and restore fracture conductivity. Flow capability, simple method, effect of increasing production

Active Publication Date: 2017-01-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fractures formed by the first hydraulic fracturing often have a rapid decline in conductivity, or even lose the conductivity, thus losing the stimulation effect
[0003] There are several main reasons for the decline of fracture conductivity, some of which are low overall conductivity (low sand-to-liquid ratio in the first construction); It is common during staged fracturing construction, or clogging is caused by formation sand or high proppant breakage rate); in some cases, the fracture height is excessively extended in the upper or lower part of the reservoir during the first fracturing process, resulting in proppant in the reservoir In some cases, the slug-type sand addition is improperly designed, resulting in discontinuous proppant support in the fracture, and the interruption length is too long. Due to the closure pressure, the fracture conductivity of the unsupported part is lost, and the subsequent propped fractures are lost. Contribution to post-press yield
Due to these unfavorable factors, the output declines rapidly after pressing
In order to increase production again, sometimes refracturing measures have to be taken to re-add sand (proppant) to support fractures, but the cost of refracturing is high and the risk is also high

Method used

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  • Oil and gas well production increasing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] like figure 1 As shown, the fractures formed by fracturing are filled with muddy pollutants, resulting in low overall conductivity and a fluid production rate of 1.5 cubic meters per day. Under the premise that the cracks do not open, with a displacement of 0.3 cubic meters per minute, squeeze 12wt% of hydrogen chloride, 3wt% of hydrogen fluoride, 1wt% of corrosion inhibitor (SRCI-2), and 1wt% of iron ions into the soil acid solution to stabilize Clay stabilizer (SRFS-1) and 1wt% clay stabilizer (SRCS-2), the dosage is 1 times the volume of the fracture, that is, 12 cubic meters. The clay acid solution has low viscosity and can quickly distribute acid in the entire range of cracks.

[0034] After the dissolution of muddy pollutants is removed, the diversion capacity increases, and the liquid production rate increases to 6.0 cubic meters per day.

Embodiment 2

[0036] like figure 2 As shown, the first fracturing had a low conductivity of near-wellbore fractures due to over-displacement of 5 cubic meters, and the fluid production rate was 2.1 cubic meters per day. Use 2 cement trucks with a displacement of 2.3 cubic meters per minute to inject active water (dosage is 2 times the volume of the fracture, 10 cubic meters) to allow the cracks to open quickly. Stop the pump immediately and take the wellhead blowout for a total of 15 cubic meters. The proppant flowed back in the fracture, the support near the wellbore was good, the conductivity was restored, and the fluid production increased to 6.8 cubic meters per day.

Embodiment 3

[0038] like image 3 As shown, the fracture height of the first fracturing was out of control, part of the proppant did not play a role in the reservoir, and the fluid production rate was 2.8 cubic meters per day. Use 2 cement trucks with a displacement of 2.2 cubic meters per minute to inject active water (3 times the volume of the fracture, 15 cubic meters) to allow the fracture to open quickly, stop the pump immediately and wait for the proppant to settle for 25 minutes before opening the well and blowing out 2 squares of liquid. The proppant in the upper part of the reservoir flowed back, the fracture conductivity in the reservoir increased, and the liquid production rate increased to 8.0 cubic meters per day.

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Abstract

The invention relates to an oil and gas well production increasing method. The method comprises the steps that firstly, mining is stopped, and the reason that the flow conductivity of old cracks is lowered is analyzed and determined; secondly, according to the reason obtained in the first step, a method for repairing the old cracks is selected; thirdly, construction parameters are determined according to the method selected in the second step, and the flow conductivity of the old cracks is recovered; and fourthly, an oil and gas well continues to be mined, specifically, the old cracks are supporting cracks formed after fracturing of the first time. According to the method provided by the invention, the cost is low, operation is easy, the flow conductivity of the old cracks formed through fracturing of the first time can be recovered to a great extent without repeated fracturing, and accordingly the yield is increased.

Description

technical field [0001] The invention relates to the field of oil and gas field development, in particular to a method for increasing production of an oil and gas well. Background technique [0002] Hydraulic fracturing is an effective means to increase the production of low permeability oil and gas wells. The conductivity of fractures formed by the first hydraulic fracturing often decreases rapidly, or even loses the conductivity, thus losing the stimulation effect. [0003] There are several main reasons for the decline of fracture conductivity, some of which are low overall conductivity (low sand-to-liquid ratio in the first construction); It is common during staged fracturing construction, or clogging is caused by formation sand or high proppant breakage rate); in some cases, the fracture height is excessively extended in the upper or lower part of the reservoir during the first fracturing process, resulting in proppant in the reservoir In some cases, the slug-type sand...

Claims

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Application Information

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IPC IPC(8): E21B43/27E21B43/267
Inventor 蒋廷学周林波刘建坤曲海吴春方李洪春李奎为
Owner CHINA PETROLEUM & CHEM CORP
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