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High-temperature-resistant drilling fluid

A technology of high temperature resistance and drilling fluid, applied in the field of drilling fluid, can solve the problem of high cost, achieve the effect of reducing drilling cost and protecting the environment

Active Publication Date: 2013-03-13
北京奥凯立科技发展股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For this reason, the technical problem to be solved by the present invention is to provide a high-temperature resistant drilling fluid whose comprehensive performance is comparable to that of oil-based high-density drilling fluid, and which can overcome the disadvantages of environmental pollution, affecting the display of oil and gas layers, and high cost.

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Examples

Experimental program
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Effect test

Embodiment 1

[0019] 1. Base slurry

[0020] The base slurry used in the present invention is 3-5% base slurry, which is formed by adding 3-5 grams of sodium bentonite per 100 ml of water and hydrating for 24 hours at room temperature. The meaning of 3% base slurry is: add 3 grams of sodium bentonite per 100 grams of water, and hydrate the base slurry after 24 hours of hydration at room temperature. The meanings of 4% base slurry and 5% base slurry are the same. Mass volume percentage measurement. Table 1 shows the apparent viscosity AV, plastic viscosity PV, dynamic shear force YP, and water loss API FL of the base slurry with different sodium bentonite contents. AV, PV, and YP are important parameters used to describe the rheology of drilling fluid. The rheology of drilling fluid refers to the characteristics of the drilling fluid flowing and deforming under the action of external force.

[0021] Table 1 Conventional performance of base slurry with different sodium bentonite content

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Embodiment 2

[0051] 1) Conventional properties of drilling fluid: According to the experimental data of Example 1, the formulation of the high temperature resistant drilling fluid in this example is as follows;

[0052] 1#: 4% base slurry + 0.4% high temperature and salt resistant tackifier + 3% OCL-JT + 3% OCL-JA + 3% OCL-JB + 0.5% SMT + 2% superfine calcium carbonate + 5% OCL -HCO+1%HCE

[0053] 2#: 4% base slurry + 0.4% anti-high temperature and anti-salt tackifier + 3% OCL-JT + 3% OCL-JA + 3% OCL-JB + 0.5% SMT + 2% superfine calcium carbonate + 5% OCL -HCO+1%HCE+100g BaSO 4

[0054] The performance parameters of the high temperature resistant drilling fluids of the two formulations 1# and 2# in this embodiment are shown in Table 6 below. In Table 6, HTHP FL is the high temperature and high pressure filtration loss, which refers to the result of twice the filtration loss measured at a pressure difference of 3.5Mpa and a measurement time of 30 minutes using a high temperature and high...

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Abstract

The invention discloses a high-temperature-resistant drilling fluid. The high-temperature-resistant drilling fluid consists of 3-5% basic fluid and 0.2-0.5 gram of high-temperature-resistant and salt-resistant tackifier, 6-10 grams of high-temperature-resistant fluid loss agent, 0.5-1 gram of viscosity reducer, 1-3 grams of loss circulation additive and 0.5-2 grams of lubricating agent which are calculated according to the additions in every 100 milliliters of the 3-5% basic fluid, wherein the 3-5% basic fluid is prepared in the way that 3-5 grams of sodium-based bentonite are added into every 100 milliliters of water and is hydrated for 24 hours under the condition of room temperature. The drilling fluid can resist the temperature of above 200 DEG C and has good high-temperature resistance; and the drilling fluid can resist 10% sodium-based bentonite, and has the lubrication coefficient of below 0.08 and good oil base imitation performance; the drilling fluid can be used for overcoming the defects that the oil-based drilling fluid pollutes the environment, influences the hydrocarbon reservoir display and is high in cost; and the drilling fluid is particularly suitable for deep well drilling.

Description

technical field [0001] The invention relates to a drilling fluid used in petroleum drilling engineering, in particular to a high temperature resistant drilling fluid suitable for drilling deep wells and ultra-deep wells. Background technique [0002] With the rapid increase in demand for oil and gas resources in the world and the advancement of drilling technology, countries around the world have increased their investment in the exploration and development of oil and gas resources in deep formations. China's unproven oil and gas resources are mainly distributed in the Tarim, Junggar, Qaidam, Turpan-Hami, and Sichuan basins. 73% of the total resources are buried in deep layers, and the underground conditions are extremely complex. Therefore, oil and gas drilling in deep and ultra-deep wells and The supporting development technology has become a key factor restricting the development of oil and gas resources. [0003] Drilling fluid is an important part of drilling engineeri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/18
Inventor 王雷周文欣卢丙朵韩晓华卢胜娟王欣王文瑞张晓坡王铁林董海军
Owner 北京奥凯立科技发展股份有限公司